JP2007098799A - Die closing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten a die closing cycle while promoting the miniaturization of a die closing device, and the simplification of the structure. <P>SOLUTION: A die clamping board 26 is driven by a die clamping cylinder 22, and a movable board 16 is made to approach a fixed die attaching plate 20 through a tie-bar 28. A movable die 14 which is held by the movable board 16 is pressed to a fixed die 18 which is held by the fixed die attaching plate 20, and a required die clamping force F is generated. In this case, the die clamping cylinder 22 drives the die clamping board 26 alone directly, and does not participate in the tying and opening motions of the movable board 16 and the die clamping board 26 with the tie-bar 28 by first and second tie-bar consolidating means 30 and 32, or the die opening/closing motion of the movable board 16 by a die opening/closing driving means 34. Therefore, the motion of the die clamping board 26 to the fixed die attaching plate 20 required for the generation of the die clamping force can be performed in parallel with respective motions or independently during the die clamping cycle, and the contribution to the shortening of the die clamping cycle becomes possible. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mold clamping device of an injection molding machine or a die casting machine.

Conventionally, as a mold clamping device used for a large molding apparatus, a “toggle type mold clamping device” having a toggle mechanism for generating a mold clamping force has been widely used. However, the toggle type mold clamping device requires a long stroke mold clamping cylinder, and there is a problem that an installation space becomes large. Further, due to wear of link parts constituting the toggle mechanism, regular maintenance is indispensable.
On the other hand, as a mold clamping device that does not use a toggle mechanism, a tie bar that connects the fixed platen to the movable platen that holds the movable mold is attached to the fixed platen by a mold clamping cylinder built in the fixed platen that holds the fixed die. On the other hand, a direct pressure type mold clamping device has been developed in which a movable mold is pressed against a fixed mold to generate a mold clamping force by being displaced (see, for example, Patent Document 1). Naturally, the direct pressure type mold clamping device does not cause the above-described problems caused by the toggle mechanism.

JP-A-2004-330552 ([Claim 1], FIGS. 4 to 8)

By the way, in general, the conventional direct pressure type mold clamping device is generally configured such that when the mold opening is performed, a split nut that solidifies the tie bar and the movable platen is opened, and the movable platen is removed from the tie bar supported by the fixed platen. And, it has a structure for securing the mold opening stroke required for the movable platen. Therefore, it is necessary to accurately position the movable platen with respect to the tie bar for each mold-clamping cycle, close the opened split nut, and solidify the tie bar and the movable platen. At this time, since the conventional direct pressure type mold clamping device is driven by the mold clamping cylinder built in the fixed platen to generate the mold clamping force, the tie bar and the split nut are positioned. In order to accurately determine the positioning reference, first, it is necessary to accurately position the tie bar with respect to the fixed platen. Therefore, careful and multi-step work is required to secure the positioning accuracy between the tie bar and the movable platen, and problems such as complicated control logic and a long mold clamping cycle have been pointed out.
The present invention has been made in view of the above problems, and its object is to make it possible to shorten the mold clamping cycle while promoting the miniaturization of the mold clamping device and the simplification of the structure. Thus, the manufacturing cost of injection molded products and die cast parts is to be reduced.

  In order to solve the above problems, a mold clamping device according to the present invention includes a movable plate that holds a movable mold on a base, and a fixed mold mounting plate that is fixed to the base and holds the fixed mold. A mold clamping cylinder having one end fixed to the fixed mold mounting plate, a mold clamping machine incorporating a hydraulic circuit thereof, a plurality of tie bars penetrating the movable plate and the mold clamping plate, and the tie bar The first and second diver fixing means for detachably fixing one end of the movable plate to the mold clamping plate and the other end to the movable plate, and a mold opening / closing drive device for opening and closing the movable plate. It is characterized by this.

In the present invention, one end of a clamping cylinder incorporated in a mold clamping machine is fixed to a stationary mold mounting plate that is fixed to a base and holds a stationary mold, and the stationary mold is mounted by this clamping cylinder. Drive the mold clamping machine against the plate. On the other hand, while the movable plate is guided by the tie bar, the movable plate moves away and approaches the fixed mold mounting plate by the mold opening / closing drive means. When the mold is closed, the movable platen is fixed to the tie bar by the second tie bar fixing means. Note that the mold clamping machine is always fixed to the tie bar by the first tie bar fixing means during the mold clamping cycle.
And in the mold closed state, by driving the mold clamping machine by the mold clamping cylinder as described above, the movable plate is brought close to the fixed mold mounting plate via the tie bar, and the movable mold held by the movable plate is Press against the fixed mold held on the fixed mold mounting plate to generate the necessary clamping force. This mold clamping cylinder directly drives only the mold clamping machine, and the first and second tie bar fastening means are used to fix and release the movable board and the mold clamping machine and the tie bar. It is not related to the mold opening / closing operation of the movable platen by the opening / closing driving means. Accordingly, it is possible to perform the operation of the mold clamping machine with respect to the fixed mold mounting plate necessary for generating the mold clamping force in parallel or independently of each operation during these mold clamping cycles. This will contribute to shortening.

  In order to solve the above problems, a mold clamping apparatus according to the present invention includes a movable plate for holding a movable mold, a fixed mold mounting plate for holding a fixed mold, and the fixed mold on a base. A mold clamping cylinder having one end fixed to the mold mounting plate and a hydraulic circuit thereof are incorporated, a fixed plate fixed to the base, a plurality of tie bars penetrating the movable plate and the fixed plate, First and second tie bar fixing means for detachably fixing one end of the tie bar to the fixed plate and the other end to the movable plate, and a mold opening / closing drive means for opening and closing the movable plate. It is characterized by this.

In the present invention, a clamping cylinder and its hydraulic circuit are incorporated in a stationary plate fixed to the base, and a stationary mold mounting plate is driven with respect to the stationary plate by the clamping cylinder. On the other hand, the movable plate moves away from the fixed plate by the mold opening / closing driving means while being guided by the tie bar. When the mold is closed, the movable platen is fixed to the tie bar by the second tie bar fixing means. The tie bar is always fixed to the stationary platen by the first tie bar fixing means during the mold clamping cycle.
Then, when the mold is closed, the fixed mold mounting plate is driven by the mold clamping cylinder as described above, so that the fixed mold held by the fixed mold mounting plate is pressed against the movable mold held by the movable platen. And generate the necessary clamping force. This mold clamping cylinder drives only the fixed mold mounting plate. The movable plate and the fixed plate and the tie bar are fixed and opened by the first and second tie bar fixing means, and the mold opening / closing driving means. It is not related to the mold opening / closing operation of the movable platen. Accordingly, it becomes possible to perform the operation of the fixed mold mounting plate with respect to the fixed plate necessary for generating the mold clamping force in parallel or independently of each operation during these mold clamping cycles, and shorten the mold clamping cycle. Will contribute.

  In addition, a mold clamping device according to the present invention for solving the above problems includes a movable plate for holding a movable mold and a fixed mold holding unit for holding a fixed mold on a base. A mold clamping device that generates a predetermined mold clamping force when the movable mold is spaced apart from and close to the mold, and a plurality of tie bars that pass through the fixed mold holding unit and the movable platen, First and second tie bar fixing means for detachably fixing one end of the tie bar to the fixed mold holding unit and the other end to the movable plate, and mold opening / closing drive for opening and closing the movable plate The fixed mold holding unit includes a fixed mold mounting plate that holds the fixed mold, and a counter board that faces the movable board across the fixed mold mounting plate. Includes a clamping cylinder connected to the fixed mold mounting plate and its hydraulic pressure When, with the first tie bar consolidation means is incorporated, either one of the stationary mold mounting plate or the opposing plate is characterized in that it is fixed to the base.

According to the present invention, the fixed mold holding unit includes a movable platen, a fixed mold mounting plate, and a counter plate facing the movable plate across the fixed mold mounting plate, and the counter plate has a fixed mold. The clamping cylinder connected to the mounting plate, its hydraulic circuit, and the first tie bar fixing means are incorporated, and either the fixed mold mounting plate or the facing plate is fixed to the base. Then, the counter plate is driven by the mold clamping cylinder with respect to the fixed mold mounting plate fixed to the base (or the fixed mold mounting plate to the counter plate fixed to the base). On the other hand, the movable plate is moved closer to the fixed mold holding unit by the mold opening / closing driving means while being guided by the tie bar. When the mold is closed, the movable platen is fixed to the tie bar by the second tie bar fixing means. The counter board is always fixed to the tie bar by the first tie bar fixing means during the mold clamping cycle.
And in the mold closed state, by driving the opposing plate or the mold mounting plate by the mold clamping cylinder as described above, the mold mounting plate and the movable plate are brought close to each other, and the movable mold held by the movable plate, The fixed mold held on the fixed mold mounting plate is pressed against each other to generate a necessary mold clamping force. This mold clamping cylinder directly drives only the opposing plate or the mold mounting plate, and the fixed mold holding unit and the movable plate and the tie bar are fixed by the first and second tie bar fixing means. -It is not involved in the opening operation or the mold opening / closing operation of the movable platen by the mold opening / closing driving means. Therefore, it becomes possible to perform the relative movement between the fixed mold mounting plate and the opposite plate necessary for generating the mold clamping force in parallel or independently with each operation during these mold clamping cycles. This contributes to shortening the time.

In the present invention, it is preferable that a power package including a servomotor, a hydraulic pump, and a tank and having a position control function and a pressure control function of the clamping cylinder is used for the hydraulic circuit.
According to this configuration, at least the liquid leakage between the servo motor, the hydraulic pump, and the tank cannot practically occur, and the occurrence of liquid leakage from the mold clamping cylinder and its hydraulic system to the outside of the mold clamping device is avoided as much as possible. can do. The power package makes it possible to perform position control and pressure control of the mold clamping cylinder in parallel or independently of other operations during the mold clamping cycle.

In the present invention, a connecting port of the hydraulic circuit of the clamping cylinder communicating with the power package to the power package is open in a direction perpendicular to the expansion / contraction direction of the clamping cylinder. desirable.
According to this configuration, when the mold clamping device is used in a die casting machine, the injection sleeve for supplying the molten metal is generally provided on the side holding the fixed mold, not on the movable platen side. Therefore, in the layout of the present invention, the injection sleeve extends in parallel with the mold clamping cylinder, and the molten metal inlet is opened on the back surface of the mold clamping cylinder. Here, even if hydraulic fluid leaks from the connection port of the hydraulic circuit of the mold clamping cylinder with the power package, the connection port opens in a direction orthogonal to the expansion / contraction direction of the mold clamping cylinder. Thus, it is possible to avoid the hydraulic oil from contacting the molten metal in the injection port of the injection sleeve, which is located on the back surface of the mold clamping cylinder. Therefore, it is not necessary to take special measures to prevent fires due to leakage of hydraulic oil.

In the present invention, it is desirable that the control means for controlling the power package includes a control logic for setting a release stroke. The control means for controlling the power package may include a control logic for setting a mold touch position.
With this configuration, it is possible to simultaneously perform a mold opening / closing operation, a tie bar positioning operation by the first and second tie bar fixing means, a mold clamping operation, a molten resin or molten metal injection operation, and the like.

  Since the present invention is configured as described above, it is possible to shorten the mold clamping cycle while reducing the size and simplifying the structure of the mold clamping device. Thus, the manufacturing cost of injection molded products and die cast parts can be reduced. Can be reduced.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

  1A and 1B are a cross-sectional view and a vertical cross-sectional view, respectively, of a mold-clamping apparatus 10 for a die casting machine according to a first embodiment of the present invention. The mold clamping device 10 includes a movable plate 16 that holds a movable mold 14 on a base 12 (FIG. 1A), and a fixed mold mounting plate that is fixed to the base 12 and holds a fixed mold 18. 20, a mold clamping cylinder 22 having one end (rod) 22 a fixed to the fixed mold mounting plate 20, and a mold clamping machine 26 incorporating the hydraulic circuit 24. Further, a plurality of (four in total, two in the top and bottom two) tie bars 28 penetrating the movable plate 16 and the mold clamping plate 26 and one end 28a of the tie bar 28 are detachably secured to the mold clamping plate 26. A tie bar fixing means 30, a second tie bar fixing means 32 for removably fixing the other end 28 b of the tie bar 28 to the movable plate 16, and a mold opening / closing drive device 34 for opening and closing the movable plate 16. I have. The mold opening / closing drive device 34 is an electric actuator composed of a servo motor 34a, a brake unit 34b, a speed reducer 34c, a ball screw 34d, and the like. Reference numeral 36 denotes an injection sleeve, and reference numeral 38 denotes a molded product extrusion apparatus. Reference numeral 40 denotes a mold opening / closing sliding device.

  In the hydraulic circuit 24, a power package 42 is used, in which a servo motor, a hydraulic pump, and a tank are integrated, and the position control function and the pressure control function of the clamping cylinder 22 are provided. The connection port 24 a of the hydraulic circuit 24 of the mold clamping cylinder 22 with the power package 42 opens in a direction perpendicular to the expansion / contraction direction of the mold clamping cylinder 22.

  The first tie bar fixing means 30 is disposed in a bag-closed box 30 a fixed to the back surface of the mold clamping plate 26 and screws (not shown) formed at equal intervals on the outer peripheral surface of the tie bar 28. The split nut 30b includes a drive mechanism 30c (FIG. 1B) such as a hydraulic cylinder that opens and closes the split nut 30b. Then, when the split nut 30b is closed by the drive mechanism 30c, the split nut 30b is screwed into the screw of the tie bar 28, and one end 28a of the tie bar 28 is fixed to the mold clamping machine 26. On the other hand, when the split nut 30b is opened by the driving mechanism 30c, the split nut 30b is unscrewed from the screw of the tie bar 28, and the one end 28a of the tie bar 28 and the mold clamping machine 26 are released from solidification. The first tie bar fixing means 30 is provided only for the upper two of the two upper and lower tie bars 28, and one end 28a of the lower two tie bars 28 is formed by a mold. Semi-permanently connected to the platen 26.

  The second tie bar fixing means 32 includes multi-grooves (not shown) formed on the outer peripheral surface of the tie bar 28 at equal intervals, and a split nut 32b disposed in a box 32a fixed to the back surface of the movable platen 16. And a drive mechanism 32c such as a hydraulic cylinder for opening and closing the split nut 32b. Further, the box 32a of the second tie bar fixing means 32 has a through hole 32d on the bottom surface, and the tie bar 28 passes through the through hole 32d. In the tie bar 28, the multi-groove is positioned in the box 32a in the mold closed state schematically shown in FIG. 1, and the split nut 32b is closed by the operation of the drive mechanism 32c in this state. As a result, the split nut 32 b meshes with the multi-grooves of the tie bar 28, and as a result, the tie bar 28 is firmly fixed to the movable platen 16. On the other hand, when the split nut 32b is opened by the drive mechanism 32c, the split nut 32b is unscrewed from the multi-groove of the tie bar 28, and the other end 28b of the tie bar 28 and the movable plate 16 are released from the solid state. The

Here, an operation procedure of the mold clamping device 10 will be described with reference to FIGS.
First, in the mold open state of FIG. 2, the split nut 30b of the first tie bar fixing means 30 of the mold clamping machine 26 is closed, and the mold clamping machine 26 and the tie bar 28 are consolidated. On the other hand, the split nut 32b of the second tie bar fixing means 30 of the movable platen 16 is opened, and the movable platen 16 is retracted within a range where it cannot be removed from the other end of the tie bar 28.

  In this state, the mold clamping cylinder 22 is controlled by the power package 42 (see FIG. 1A) that drives the mold clamping cylinder 22, and the mold clamping plate 26 is moved back to a predetermined position with respect to the fixed mold mounting plate 20. Let At this time, the position when the retraction of the mold clamping machine 26 is completed depends on the mold thicknesses of the movable mold 14 held by the movable board 16 and the fixed mold 18 held by the fixed mold mounting plate 20. It is a position for setting an appropriate mold touch position and release stroke, and a control logic of the power package 42 is incorporated in advance in a control device (not shown). Further, the retreat distance of the mold clamping plate 26 is accurately determined by the position control function of the mold clamping cylinder 22 provided in the power package 42. The control device (not shown) includes not only the control logic of the power package 42 but also the driving mechanism 30c of the first tie bar fixing means 30, the driving mechanism 32c of the second tie bar fixing means 32, and the mold opening / closing sliding device 40. Control logic is also incorporated to operate at the appropriate timing.

Subsequently, the movable platen 16 is driven by the mold opening / closing driving device 34 while being guided by the tie bar 28 and the mold opening / closing sliding device 40, and moves to the mold closed state shown in FIG. 3 and stops. The specific stop position of the movable platen 16 is a multi-grooved groove formed on the outer peripheral surface of the tie bar 28 at equal intervals and a multi-grooved groove formed on the split nut 32b of the second tie bar fixing means 30 of the movable platen 16. Is a position where the gap between the movable mold 14 and the fixed mold 18 is minimized from the relationship with the pitch of the multi-grooves. This position is calculated in advance by the position of the multi-grooves of the tie bar 28 and the mold thickness when casting conditions (molding conditions) including the thicknesses of the movable mold 14 and the fixed mold 18 are set. The control logic of the package 42 is previously incorporated in a control device (not shown). Further, by setting the position where the gap between the movable mold 14 and the fixed mold 18 is minimized, the operation stroke of the mold clamping cylinder 22 for obtaining a necessary mold clamping force can be minimized.
In this state, the split nut 32b of the second tie bar fixing means 30 of the movable platen 16 is closed, and the movable platen 16 and the tie bar 28 are solidified.

Subsequently, a predetermined amount of hydraulic oil is supplied from the power package 42 to the mold clamping cylinder 22, and the mold clamping plate 26 is further moved backward with respect to the fixed mold mounting plate 20 at low speed and low pressure. Then, the backward movement of the mold clamping plate 26 is transmitted to the movable platen 16 via the tie bar 28, and the movable platen 14 approaches the fixed die mounting plate 20, whereby the movable die 14 held by the movable platen 16. As shown in FIG. 4, the mold is touched to the fixed mold 18 held on the fixed mold mounting plate 20. The reason for controlling at a constant speed / low pressure is to control the clamping cylinder 22 by detecting an increase in the control hydraulic pressure of the clamping cylinder 22 when foreign matter is caught between the movable mold 14 and the stationary mold 18. This is to stop and protect the mold. Even after the mold is touched, the supply pressure of hydraulic oil from the power package 42 to the mold clamping cylinder 22 is increased, and a predetermined mold clamping force F is generated. This mold clamping force F is also included in the casting conditions (molding conditions), and the control logic of the power package 42 for applying a predetermined mold clamping force is incorporated in a controller (not shown) in advance. A control device (not shown) performs position control until the mold touch, and performs pressure control after the mold touch.
In such a state, the molten metal is supplied into the injection sleeve 36, and this molten metal is injected into the mold cavity by the injection plunger 37.

When the predetermined cooling is completed after the molten metal is filled, the hydraulic oil for reducing the supply pressure of the hydraulic oil from the power package 42 to the clamping cylinder 22 and contracting the rod 22a of the clamping cylinder 22 is supplied to the power package 42. To the mold clamping cylinder 22. As a result, as shown in FIG. 5, the mold clamping plate 26 approaches the fixed mold mounting plate 20. The operation of the mold clamping plate 26 is transmitted to the movable platen 16 via the tie bar 28, and the movable platen 16 is separated from the fixed die mounting plate 20, so that the movable die 14 held by the movable platen 16 is The fixed mold 18 held by the fixed mold mounting plate 20 moves backward.
In this state, the injection plunger 37 is continuously given the injection pressure when the molten metal is injected, and the injection plunger 37 continues to push the biscuits connected to the molded product on the movable mold 14 side. Therefore, the fixed mold 18 and the movable mold 14 are released while the molded product is in close contact with the movable mold 14 side.

After the mold clamping cylinder 22 contracts, the movable platen 16 retracts to a predetermined position, and then the split nut 32b of the second tie bar fixing means 32 of the movable platen 16 is released. Subsequently, the movable platen 16 is driven by the mold opening / closing driving device 34 while being guided by the tie bar 28 and the mold opening / closing sliding device 40, and moves to the mold open state shown in FIG. 6 and stops. Thus, the mold clamping cycle of the mold clamping apparatus 10 is completed.
In the mold open state of FIG. 6, the extrusion device 38 is driven to release the molded product from the movable mold 14 and the injection plunger 37 is retracted to return to the mold open state shown in FIG. 2. To do.

Next, with reference to FIGS. 7 to 9, a tie bar removing operation when the mold clamping device 10 performs the changeover of the movable mold 14 and the fixed mold 18 will be described.
In the tie bar removing operation, for convenience of explanation, a tie bar removing cylinder 44 that is not shown and described in FIGS. 1 to 6 is used. The tie bar removal cylinder 44 is fixed to the movable platen 16 so that the cylinder rod 44a extends to the back side of the movable platen 16. The cylinder rod 44 a is provided with a clamp 46 that holds the other end 28 b of the tie bar 28. The structure of the clamp 46 can be the same as that of the split nut 30b and the drive mechanism 30c of the first tie bar fixing means 30.

  In the tie bar removal operation, first, the other end 28b of the tie bar 28 is clamped by the clamp 46 in the mold closed state shown in FIG. Further, the split nut 30b of the first tie bar fixing means 30 of the mold clamping machine 26 is released, and the solidified state between the mold clamping machine 26 and the tie bar 28 is released. Further, the split nut 32b of the second tie bar fixing means 32 of the movable platen 16 is also released, and the solidified state between the movable platen 16 and the tie bar 28 is also released. Each of these operations can be performed simultaneously.

Subsequently, the movable platen 16 is driven by the mold opening / closing drive device 34 while being guided by the tie bar 28 and the mold opening / closing sliding device 40, and moves and stops until the mold opening state shown in FIG. 8 is reached. Then, due to the movement of the movable platen 16, the one ends 28 a of the upper two tie bars 28 with the other ends 28 b held between the clamps 46 are pulled out from the mold clamping plate 26 and the first tie bar fixing means 30.
In this state, by extending the cylinder rod 44a of the tie bar removal cylinder 44, as shown in FIG. 9, the tie bar 28 is further retracted, and the tie bar 28 is removed from above the mold clamping device 10 to change the mold. Space is secured. In addition, after completion of the mold change, the reverse operation of FIGS. 9 to 7 is performed to return to a predetermined mold closed state.

  According to the first embodiment of the present invention having the above-described configuration, the following operational effects can be obtained. First, in the first embodiment of the present invention, the rod 22a of the mold clamping cylinder 22 incorporated in the mold clamping machine 26 with respect to the fixed mold mounting plate 20 fixed to the base 12 and holding the fixed mold 18. The mold clamping cylinder 22 drives the mold clamping plate 26 against the fixed mold mounting plate 20. On the other hand, while the movable platen 16 is guided by the tie bar 28, the movable platen 16 moves away from the fixed mold mounting plate 20 by the mold opening / closing drive means 34. When the mold is closed (FIGS. 1 and 3), the movable platen 16 is fixed to the tie bar 28 by the second tie bar fixing means 32. Note that the mold clamping machine 26 is always fixed to the tie bar 28 by the first tie bar fixing means 30 during the mold clamping cycle.

  Then, when the mold is closed, the mold clamping machine 26 is driven by the mold clamping cylinder 22 as described above, whereby the movable board 16 is brought close to the fixed mold mounting plate 20 via the tie bar 28 and is held by the movable board 16. The movable mold 14 is pressed against the fixed mold 18 held by the fixed mold mounting plate 20 to generate a necessary mold clamping force F. The mold clamping cylinder 22 directly drives only the mold clamping machine 26. The movable cylinder 16 and the mold clamping machine 26 and the tie bar 28 by the first and second tie bar fixing means 30, 32 are used. It is not involved in the consolidation / opening operation or the mold opening / closing operation of the movable platen 16 by the mold opening / closing drive means 34. Accordingly, it is possible to perform the operation of the mold clamping machine 26 with respect to the fixed mold mounting plate 20 necessary for generating the mold clamping force in parallel or independently of each operation during these mold clamping cycles. This will contribute to shortening the cycle.

  In the hydraulic circuit 24, a servo motor, a hydraulic pump and a tank are integrated, and a power package 42 having a position control function and a pressure control function of the mold clamping cylinder is used. Accordingly, at least liquid leakage among the servo motor, the hydraulic pump, and the tank cannot practically occur, and occurrence of liquid leakage from the mold clamping cylinder 22 and its hydraulic circuit 24 to the outside of the mold clamping apparatus 10 is avoided as much as possible. be able to. The power package 42 allows position control and pressure control of the mold clamping cylinder 22 to be performed in parallel or independently of other operations during the mold clamping cycle.

In the present embodiment, the connecting port 24a of the hydraulic circuit 24 of the mold clamping cylinder 22 communicating with the power package 42 is connected to the power package 42 as shown in FIG. It opens in the direction orthogonal to the expansion / contraction direction. In the case of a die-clamping machine for a die casting machine, the injection sleeve 36 for supplying molten metal is generally provided not on the movable platen 16 side but on the side for holding the stationary mold 18. Also in the layout according to the present embodiment, the injection sleeve 36 extends in parallel with the mold clamping cylinder 22, and the molten metal inlet 36 a (FIG. 1) is opened on the back surface of the mold clamping cylinder 22. Here, even if hydraulic fluid leaks out from the connection port 24 a of the hydraulic circuit 24 of the mold clamping cylinder 22 to the power package 42, the direction of the connection port 24 a orthogonal to the expansion and contraction direction of the mold clamping cylinder 22. With the opening, it is possible to prevent the hydraulic oil from coming into contact with the molten metal in the injection port 36a of the injection sleeve 36 located on the back surface of the mold clamping cylinder 22.
That is, in conjunction with the adoption of the power package 42, the mold clamping cylinder 22 and its hydraulic drive system do not have a liquid leakage element on the surface opposite to the surface facing the movable plate 16, in a manner that the mold clamping machine 26. Therefore, it is not necessary to take a fire prevention measure for any hydraulic oil leakage, and it is possible to promote simplification of the structure of the mold clamping device.

In the present invention, the control means for controlling the power package 42 includes control logic for setting the mold release stroke and control logic for setting the mold touch position. The mold opening and closing operation, the positioning operation of the tie bar 28 by the first and second tie bar fixing means 30 and 32, the mold clamping operation by the mold clamping cylinder 22, the injection operation of the molten metal by the injection plunger 37, etc. can be performed simultaneously. This will contribute to shortening the mold clamping cycle.
As other advantages, since the movable platen 16 does not have the mold clamping cylinder 22, the reliability of the movable side components is increased, and the movable platen 16 is simplified and the weight is reduced. Miniaturization of the sliding device 40 can be promoted. In addition, the overall length of the apparatus can be shortened while the tie bar removing operation is possible.

  Subsequently, a mold clamping device according to a second embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected about the part which is the same as the mold clamping device which concerns on the 1st Embodiment of this invention, or a corresponding part.

  10A and 10B show a cross-sectional view and a vertical cross-sectional view, respectively, of a mold-clamping apparatus 11 for a die casting machine according to a second embodiment of the present invention. The mold clamping device 11 has a movable plate 16 for holding a movable mold 14, a fixed mold mounting plate 21 for holding a fixed mold 18, and one end thereof with respect to the fixed mold mounting plate 21. A mold clamping cylinder 22 to which a (rod) 22 a is fixed and a hydraulic circuit 24 thereof are incorporated, and a fixed platen 27 fixed to the base 12 is provided. Also, a plurality of (four in total, two in the upper and lower two) tie bars 28 penetrating the movable platen 16 and the fixed platen 27, and one end 28a of the tie bar 28 are fixedly attached to the fixed platen 27 in a detachable manner. And a second tie bar fixing means 32 for detachably fixing the other end 28b of the tie bar 28 to the movable platen 16; and a mold opening / closing drive device 34 for opening and closing the movable platen 16. Yes. The mold opening / closing drive device 34 is an electric actuator composed of a servo motor 34a, a brake unit 34b, a speed reducer 34c, a ball screw 34d, and the like. Reference numeral 36 denotes an injection sleeve, and reference numeral 38 denotes a molded product extrusion apparatus. Reference numeral 40 denotes a mold opening / closing sliding device.

  In the hydraulic circuit 24, a power package 42 is used, in which a servo motor, a hydraulic pump, and a tank are integrated, and the position control function and the pressure control function of the clamping cylinder 22 are provided. The connection port 24 a of the hydraulic circuit 24 of the mold clamping cylinder 22 with the power package 42 opens in a direction perpendicular to the expansion / contraction direction of the mold clamping cylinder 22.

  The first tie bar fixing means 30 includes screws (not shown) formed on the outer peripheral surface of the tie bar 28 at equal intervals, and a split 30 disposed in a bag-closing box 30 a fixed to the back surface of the fixed plate 27. It consists of a nut 30b and a drive mechanism 30c (FIG. 10B) such as a hydraulic cylinder that opens and closes the split nut 30b. Then, when the split nut 30 b is closed by the drive mechanism 30 c, the split nut 30 b is screwed into the screw of the tie bar 28, and one end 28 a of the tie bar 28 is firmly fixed to the fixed platen 27. On the other hand, when the split nut 30b is opened by the drive mechanism 30c, the split nut 30b is unscrewed from the screw of the tie bar 28, and the one end 28a of the tie bar 28 and the fixed plate 27 are released from the solid state. The first tie bar fixing means 30 is provided only for the upper two of the two tie bars 28 provided at the top and bottom, and one end 28a of the two lower tie bars 28 is fixed. Semi-permanently connected to the board 27.

  The second tie bar fixing means 32 includes multi-grooves (not shown) formed on the outer peripheral surface of the tie bar 28 at equal intervals, and a split nut 32b disposed in a box 32a fixed to the back surface of the movable platen 16. And a drive mechanism 32c such as a hydraulic cylinder for opening and closing the split nut 32b. Further, the box 32a of the second tie bar fixing means 32 has a through hole 32d on the bottom surface, and the tie bar 28 passes through the through hole 32d. In the tie bar 28, the multi-groove is positioned in the box 32a in the mold closed state schematically shown in FIG. 10, and the split nut 32b is closed by the operation of the drive mechanism 32c in this state. As a result, the split nut 32 b meshes with the multi-grooves of the tie bar 28, and as a result, the tie bar 28 is firmly fixed to the movable platen 16. On the other hand, when the split nut 32b is opened by the drive mechanism 32c, the split nut 32b is unscrewed from the multi-groove of the tie bar 28, and the other end 28b of the tie bar 28 and the movable plate 16 are released from the solid state. The

Here, the operation procedure of the mold clamping device 11 will be described with reference to FIGS.
First, in the mold open state of FIG. 11, the split nut 30b of the first tie bar fixing means 30 of the fixed platen 27 is closed, and the fixed platen 27 and the tie bar 28 are solidified. On the other hand, the split nut 32b of the second tie bar fixing means 30 of the movable platen 16 is opened, and the movable platen 16 is retracted within a range where it cannot be removed from the other end of the tie bar 28.

  In this state, the mold clamping cylinder 22 is controlled by a power package 42 (see FIG. 10A) that drives the mold clamping cylinder 22, and the fixed mold mounting plate 21 is advanced to a predetermined position with respect to the fixed platen 27. . At this time, the position when the fixed mold mounting plate 21 has been advanced is in accordance with the mold thickness of the movable mold 14 held by the movable platen 16 and the fixed mold 18 held by the fixed mold mounting plate 21. Thus, it is a position for setting an appropriate mold touch position and release stroke, and a control logic of the power package 42 is incorporated in advance in a control device (not shown). Further, the advance distance of the fixed mold mounting plate 21 is accurately determined by the position control function of the mold clamping cylinder 22 included in the power package 42. The control device (not shown) includes not only the control logic of the power package 42 but also the driving mechanism 30c of the first tie bar fixing means 30, the driving mechanism 32c of the second tie bar fixing means 32, and the mold opening / closing sliding device 40. Control logic is also incorporated to operate at the appropriate timing.

Subsequently, the movable platen 16 is driven by the mold opening / closing drive device 34 while being guided by the tie bar 28 and the mold opening / closing sliding device 40, and moves to the mold closed state shown in FIG. 12 and stops. The specific stop position of the movable platen 16 is a multi-grooved groove formed on the outer peripheral surface of the tie bar 28 at equal intervals, and a multi-grooved groove formed on the split nut 32b of the second tie bar fixing means 30 of the movable platen 16. Is a position where the gap between the movable mold 14 and the fixed mold 18 is minimized from the relationship with the pitch of the multi-grooves. This position is calculated in advance by the position of the multi-grooves of the tie bar 28 and the mold thickness when casting conditions (molding conditions) including the thicknesses of the movable mold 14 and the fixed mold 18 are set. The control logic of the package 42 is previously incorporated in a control device (not shown). Further, by setting the position where the gap between the movable mold 14 and the fixed mold 18 is minimized, the operation stroke of the mold clamping cylinder 22 for obtaining a necessary mold clamping force can be minimized.
In this state, the split nut 32b of the second tie bar fixing means 30 of the movable platen 16 is closed, and the movable platen 16 and the tie bar 28 are solidified.

Subsequently, a predetermined amount of hydraulic oil is supplied from the power package 42 to the mold clamping cylinder 22, and the fixed mold mounting plate 21 is further advanced at a constant speed and low pressure relative to the fixed plate 27. Then, when the fixed mold mounting plate 21 approaches the movable plate 26, the fixed mold 18 held by the fixed mold mounting plate 21 is changed from the movable mold 14 held by the movable plate 16 with reference to FIG. 13. Touch the mold as shown. The reason for controlling at a constant speed / low pressure is to control the clamping cylinder 22 by detecting an increase in the control hydraulic pressure of the clamping cylinder 22 when a foreign object is caught between the movable mold 14 and the stationary mold 18. This is to stop and protect the mold. Even after the mold is touched, the supply pressure of hydraulic oil from the power package 42 to the mold clamping cylinder 22 is increased, and a predetermined mold clamping force F is generated. This mold clamping force F is also included in the casting conditions (molding conditions), and the control logic of the power package 42 for applying a predetermined mold clamping force is incorporated in a controller (not shown) in advance. A control device (not shown) performs position control until the mold touch, and performs pressure control after the mold touch.
In such a state, the molten metal is supplied into the injection sleeve 36, and this molten metal is injected into the mold cavity by the injection plunger 37.

When the predetermined cooling is completed after the molten metal is filled, the hydraulic oil for reducing the supply pressure of the hydraulic oil from the power package 42 to the clamping cylinder 22 and contracting the rod 22a of the clamping cylinder 22 is supplied to the power package 42. To the mold clamping cylinder 22. As a result, as shown in FIG. 14, the fixed mold mounting plate 21 approaches the movable platen 27. By the operation of the fixed mold mounting plate 21, the fixed mold 18 held by the fixed mold mounting plate 21 moves backward with respect to the movable mold 14 held by the movable platen 16.
In this state, the injection plunger 37 is continuously given the injection pressure when the molten metal is injected, and the injection plunger 37 continues to push the biscuits connected to the molded product on the movable mold 14 side. Therefore, the fixed mold 18 and the movable mold 14 are released while the molded product is in close contact with the movable mold 14 side.

After the mold clamping cylinder 22 is contracted, the fixed mold mounting plate 21 is retracted to a predetermined position, and then the split nut 32b of the second tie bar fixing means 32 of the movable platen 16 is released. Subsequently, the movable platen 16 is driven by the mold opening / closing driving device 34 while being guided by the tie bar 28 and the mold opening / closing sliding device 40, moves to the mold open state shown in FIG. 15, and stops. Thus, the mold clamping cycle of the mold clamping device 11 is completed.
In the mold open state of FIG. 15, the extrusion device 38 is driven to release the molded product from the movable mold 14 and the injection plunger 37 is retracted to return to the mold open state shown in FIG. To do.

Next, with reference to FIGS. 16 to 18, a tie bar removing operation when the mold clamping device 10 performs the setup change of the movable mold 14 and the fixed mold 18 will be described.
In the tie bar removing operation, for convenience of explanation, a tie bar removing cylinder 44 that is not shown and described in FIGS. 11 to 15 is used. The tie bar removal cylinder 44 is fixed to the movable platen 16 so that the cylinder rod 44a extends to the back side of the movable platen 16. The cylinder rod 44 a is provided with a clamp 46 that holds the other end 28 b of the tie bar 28. The structure of the clamp 46 can be the same as that of the split nut 30b and the drive mechanism 30c of the first tie bar fixing means 30.

  In the tie bar removal operation, first, the other end 28b of the tie bar 28 is clamped by the clamp 46 in the mold closed state shown in FIG. Further, the split nut 30b of the first tie bar fixing means 30 of the fixed platen 27 is released, and the fixed state between the fixed platen 27 and the tie bar 28 is released. Further, the split nut 32b of the second tie bar fixing means 32 of the movable platen 16 is also released, and the solidified state between the movable platen 16 and the tie bar 28 is also released. Each of these operations can be performed simultaneously.

Subsequently, the movable platen 16 is driven by the mold opening / closing driving device 34 while being guided by the tie bar 28 and the mold opening / closing sliding device 40, and moves and stops until the mold opening state shown in FIG. Then, due to the movement of the movable platen 16, the one ends 28 a of the upper two tie bars 28 with the other end 28 b held between the clamps 46 are extracted from the fixed platen 27 and the first tie bar fixing means 30.
In this state, by extending the cylinder rod 44a of the tie bar removing cylinder 44, the tie bar 28 is further retracted as shown in FIG. 18, and the tie bar 28 is removed from above the mold clamping device 10 to change the mold. Space is secured. In addition, after completion of the mold change, the reverse operation of FIGS. 18 to 16 is performed to return to a predetermined mold closed state.

  According to the second embodiment of the present invention having the above configuration, the following operational effects can be obtained. First, in the second embodiment of the present invention, the mold clamping cylinder 22 and its hydraulic circuit 24 are incorporated in the stationary platen 27 fixed to the base 12, and the mold clamping cylinder 22 causes the stationary platen 27 to attach to the stationary platen 27. On the other hand, the fixed mold mounting plate 21 is driven. On the other hand, the movable platen 16 moves away from the fixed platen 27 by the mold opening / closing drive means 34 while being guided by the tie bar 28. When the mold is closed (FIGS. 10 and 12), the movable platen 16 is fixed to the tie bar 28 by the second tie bar fixing means 32. The tie bar 28 is always fixed to the fixed plate 27 by the first tie bar fixing means 30 during the mold clamping cycle.

  Then, the fixed mold 18 held by the fixed mold mounting plate 21 is held by the movable platen 16 by driving the fixed mold mounting plate 21 by the mold clamping cylinder 22 as described above in the mold closed state. Press against the movable mold 14 to generate a necessary clamping force F. The mold clamping cylinder 22 drives only the fixed mold mounting plate 21, and the movable plate 16 and the fixed plate 27 are fixed to the tie bar 28 by the first and second tie bar fixing means 30 and 32. It is not involved in the opening operation or the mold opening / closing operation of the movable platen 16 by the mold opening / closing drive means 34. Therefore, it becomes possible to perform the operation of the fixed mold mounting plate 21 with respect to the fixed platen 27 necessary for generating the mold clamping force in parallel or independently of each operation during these mold clamping cycles, and the mold clamping cycle. This contributes to shortening the time.

  In the hydraulic circuit 24, a servo motor, a hydraulic pump and a tank are integrated, and a power package 42 having a position control function and a pressure control function of the mold clamping cylinder is used. Accordingly, at least liquid leakage among the servo motor, the hydraulic pump, and the tank cannot practically occur, and occurrence of liquid leakage from the mold clamping cylinder 22 and its hydraulic circuit 24 to the outside of the mold clamping device 11 is avoided as much as possible. be able to. The power package 42 allows position control and pressure control of the mold clamping cylinder 22 to be performed in parallel or independently of other operations during the mold clamping cycle.

In the present embodiment, the connecting port 24a of the hydraulic circuit 24 of the mold clamping cylinder 22 communicating with the power package 42 to the power package 42 has a mold clamping cylinder 22 as shown in FIG. It opens in the direction orthogonal to the expansion / contraction direction. In the case of a die-clamping machine for a die casting machine, the injection sleeve 36 for supplying molten metal is generally provided not on the movable platen 16 side but on the side for holding the stationary mold 18. Also in the layout according to the present embodiment, the injection sleeve 36 extends in parallel with the mold clamping cylinder 22, and a molten metal inlet 36 a (FIG. 10) is opened on the back surface of the mold clamping cylinder 22. Here, even if hydraulic fluid leaks out from the connection port 24 a of the hydraulic circuit 24 of the mold clamping cylinder 22 to the power package 42, the direction of the connection port 24 a orthogonal to the expansion and contraction direction of the mold clamping cylinder 22. With the opening, it is possible to prevent the hydraulic oil from coming into contact with the molten metal in the injection port 36a of the injection sleeve 36 located on the back surface of the mold clamping cylinder 22.
That is, in conjunction with the adoption of the power package 42, the mold clamping cylinder 22 and its hydraulic drive system do not have a liquid leakage element on the surface opposite to the surface facing the movable plate 16, so that the fixed plate 27 Built in. Therefore, it is not necessary to take a fire prevention measure for any hydraulic oil leakage, and it is possible to promote simplification of the structure of the mold clamping device.

In the present invention, the control means for controlling the power package 42 includes control logic for setting the mold release stroke and control logic for setting the mold touch position. The mold opening and closing operation, the positioning operation of the tie bar 28 by the first and second tie bar fixing means 30 and 32, the mold clamping operation by the mold clamping cylinder 22, the injection operation of the molten metal by the injection plunger 37, etc. can be performed simultaneously. This will contribute to shortening the mold clamping cycle.
As other advantages, since the movable platen 16 does not have the mold clamping cylinder 22, the reliability of the movable side components is increased, and the movable platen 16 is simplified and the weight is reduced. Miniaturization of the sliding device 40 can be promoted. In addition, the overall length of the apparatus can be shortened while the tie bar removing operation is possible.

Although not shown, a horizontal guide having rigidity capable of supporting the weight of the fixed mold mounting plate 21 is provided. As a specific example of the horizontal guide, a guide pin or a liner is provided on the fixed platen 27 for guiding the fixed mold mounting plate 21, or a guide mechanism for the fixed mold mounting plate 21 is provided on the base 12 or the tie bar 28. Etc.
Although not shown, a drive mechanism for moving the injection sleeve 36 and the injection plunger 37 together with the fixed mold mounting plate 21 when the fixed mold mounting plate 21 moves with respect to the fixed platen 27 is provided.

  Now, the mold clamping apparatus 10 according to the first embodiment of the present invention and the mold clamping apparatus 11 according to the second embodiment of the present invention having the above-described features include the fixed mold mounting plates 20, 21. The only difference is whether the mold clamping plate 26 or the fixed plate 27 is fixed to the base 12 and has the following common points.

  In other words, the mold clamping apparatuses 10 and 11 according to the present invention have a movable mold 16 for holding a movable mold 14 and a fixed mold holding unit for holding a fixed mold 18 on a base 12, that is, a first mold holding unit. The fixed mold mounting plate 20 and the mold clamping plate 26 according to the embodiment, or the fixed mold mounting plate 21 and the fixed plate 27 according to the second embodiment, and a movable mold with respect to the fixed mold 18 are provided. The mold clamping device 14 generates a predetermined mold clamping force when the mold 14 is moved away from and close to the mold.

  A plurality of tie bars 28 penetrating the fixed mold holding unit and the movable platen 16, one end 28a of the tie bar 28 is attached to the fixed die holding unit, and the other end 28b is detachably fixed to the movable platen 16, respectively. First and second tie bar fastening means 30 and 32 for joining, and mold opening / closing drive means 34 for opening and closing the movable platen 16 are provided, and the fixed mold holding unit is a fixed mold for holding the fixed mold 18. A mounting plate 20 or 21 and a counter plate facing the movable platen 16 with the fixed mold mounting plate 20 or 21 sandwiched therebetween, that is, a mold clamping plate 26 or a fixed plate 27 are provided. A mold clamping cylinder 22 and its hydraulic circuit 24 connected to the mold mounting plates 20 and 21 and the first tie bar fixing means 30 are incorporated, and either the fixed mold mounting plates 20 or 21 or the opposing plates 26 and 27 are installed. One side And it is characterized in that it is fixed to the pedestal 12.

And according to the said structure, it becomes possible to obtain the following effects.
That is, the fixed mold holding unit (20 and 26 or 21 and 27) includes the movable platen 16, the fixed mold attachment plates 20 and 21, and the movable platen 16 with the fixed mold attachment plates 20 and 21 interposed therebetween. Opposite facing plates 26 and 27 are provided. The facing plates 26 and 27 include a clamping cylinder 22 connected to the fixed mold mounting plates 20 and 21 and a hydraulic circuit 24 thereof, and a first tie bar fixing means 30. Since either one of the fixed mold mounting plates 20 and 21 or the opposing plates 26 and 27 is fixed to the base 12, the fixed mold is fixed to the base 12 by the mold clamping cylinder 22. The counter plate 26 is driven with respect to the mounting plate 20 (or the fixed mold mounting plate 21 is driven with respect to the counter plate 27 fixed to the base 12).
On the other hand, while the movable platen 16 is guided by the tie bar 28, the movable platen 16 moves away from and approaches the fixed mold holding unit by the mold opening / closing drive means 34. When the mold is closed (FIGS. 3 and 12), the movable platen 16 is fixed to the tie bar 28 by the second tie bar fixing means 32. The facing plates 26 and 27 are always fixed to the tie bar 28 by the first tie bar fixing means 30 during the mold clamping cycle.

  Then, when the mold is closed, the opposing plate 26 or the mold mounting plate 21 is driven by the mold clamping cylinder 22 as described above, so that the mold mounting plates 20 and 21 and the movable plate 16 are brought close to each other. The held movable mold 14 and the fixed mold 18 held by the fixed mold mounting plates 20 and 21 are pressed against each other to generate a necessary mold clamping force F. The mold clamping cylinder 22 directly drives only the facing plate 26 or the mold mounting plate 21 and is a fixed mold holding unit (20 and 20) by the first and second tie bar fixing means 30 and 32. 26, 21 and 27) and the operation of solidifying / opening the movable platen 16 and the tie bar 28, and the mold opening / closing operation of the movable platen 16 by the mold opening / closing driving means. Accordingly, in parallel with or independently of each operation during these mold clamping cycles, the relative movement between the fixed mold mounting plates 20 and 21 and the opposing plates 26 and 27 necessary for generating the mold clamping force F is performed. This contributes to shortening the mold clamping cycle.

  In the first and second embodiments of the present invention, the case where the mold clamping apparatus according to the present invention is applied to a die casting machine has been described as an example. However, the mold clamping apparatus according to the present invention is not made of resin. It will be understood that the present invention can also be applied to a mold clamping device of an injection molding machine that molds a molded product.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the mold clamping apparatus which concerns on the 1st Embodiment of this invention, (a) shows the cross-sectional view of the mold clamp apparatus, (b) has shown the longitudinal cross-sectional view. It is a longitudinal cross-sectional view which shows the mold open state of the mold clamping apparatus of FIG. It is a longitudinal cross-sectional view which shows the mold closed state of the mold clamping apparatus of FIG. It is a longitudinal cross-sectional view which shows the mold touch state of the mold clamping apparatus of FIG. It is a longitudinal cross-sectional view which shows the mold release state of the mold clamping apparatus of FIG. It is a longitudinal cross-sectional view which shows the mold clamping cycle completion state of the mold clamping apparatus of FIG. It is a longitudinal cross-sectional view which shows the initial state of the tie bar extraction operation | movement of the mold clamping apparatus of FIG. It is a longitudinal cross-sectional view which shows the intermediate state of the tie bar extraction operation | movement of the mold clamping apparatus of FIG. It is a longitudinal cross-sectional view which shows the completion state of the tie bar extraction operation | movement of the mold clamping apparatus of FIG. It is a schematic diagram which shows the mold clamping apparatus which concerns on the 2nd Embodiment of this invention, (a) shows the cross-sectional view of the mold clamp apparatus, (b) has shown the longitudinal cross-sectional view. It is a longitudinal cross-sectional view which shows the mold open state of the mold clamping apparatus of FIG. It is a longitudinal cross-sectional view which shows the mold closed state of the mold clamping apparatus of FIG. It is a longitudinal cross-sectional view which shows the mold touch state of the mold clamping apparatus of FIG. It is a longitudinal cross-sectional view which shows the mold release state of the mold clamping apparatus of FIG. It is a longitudinal cross-sectional view which shows the mold clamping cycle completion state of the mold clamping apparatus of FIG. It is a longitudinal cross-sectional view which shows the initial state of the tie bar extraction operation | movement of the mold clamping apparatus of FIG. It is a longitudinal cross-sectional view which shows the intermediate state of the tie bar extraction operation | movement of the mold clamping apparatus of FIG. It is a longitudinal cross-sectional view which shows the completion state of the tie bar extraction operation | movement of the mold clamping apparatus of FIG.

Explanation of symbols

10, 11: mold clamping device, 12: base, 14: movable mold, 16: movable platen, 18: fixed mold, 20, 21: fixed mold mounting plate, 22: mold clamping cylinder, 22a rod, 24 : Hydraulic circuit, 24a: connecting port, 26: mold clamping machine, 27: fixed board, 28: tie bar, 30: first tie bar fastening means, 32: second tie bar fastening means, 34: mold opening / closing drive device

Claims (7)

A movable plate that holds a movable mold on a base, a fixed mold mounting plate that is fixed to the base and holds a fixed mold, and a mold clamp in which one end is fixed to the fixed mold mounting plate. A mold clamping machine incorporating a cylinder and its hydraulic circuit, a plurality of tie bars passing through the movable board and the mold clamping machine, one end of the tie bar to the mold clamping machine, and the other end to the movable board And a mold opening / closing drive device for opening and closing the movable plate. A movable plate for holding a movable mold on a base, a fixed mold mounting plate for holding a fixed mold, a clamping cylinder having one end fixed to the fixed mold mounting plate, and a hydraulic circuit therefor And a fixed platen fixed to the base, a plurality of tie bars penetrating the movable platen and the fixed platen, one end of the tie bar to the fixed platen, and the other end to the movable platen, respectively. A mold clamping apparatus comprising: first and second tie bar fixing means that are detachably fixed; and mold opening / closing drive means for opening and closing the movable plate. A movable plate for holding a movable mold and a fixed mold holding unit for holding a fixed mold are provided on a base, and the movable mold moves away from and approaches the fixed mold. A mold clamping device for generating a mold clamping force,
A plurality of tie bars penetrating the fixed mold holding unit and the movable platen, and one end of the tie bar fixed to the fixed die holding unit and the other end detachably fixed to the movable platen. A second tie bar fixing means; and a mold opening / closing drive means for opening and closing the movable plate.
The fixed mold holding unit includes a fixed mold mounting plate that holds the fixed mold, and a counter board that faces the movable plate across the fixed mold mounting plate, and the counter board includes the fixed mold mounting plate. A mold clamping cylinder connected to the mold mounting plate and its hydraulic circuit, and the first tie bar fixing means are incorporated,
Either one of the fixed mold mounting plate or the facing plate is fixed to the base. The servo circuit, the hydraulic pump and the tank are integrated in the hydraulic circuit, and a power package having a position control function and a pressure control function of the clamping cylinder is used. The mold clamping device according to any one of the above. 5. The connection port of the hydraulic circuit of the clamping cylinder communicating with the power package to the power package is opened in a direction orthogonal to the expansion / contraction direction of the clamping cylinder. Mold clamping device. 6. The mold clamping apparatus according to claim 4, wherein the control means for controlling the power package includes a control logic for setting a release stroke. The mold clamping apparatus according to claim 4, wherein the control unit that controls the power package includes a control logic that sets a mold touch position.

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