TW200902272A - Mold clamping device and mold clamping device control method - Google Patents

Abstract

A mold clamping device includes an electromagnet which drives a mold clamping operation and a mold open/close drive unit. The mold open/close drive unit is variably controlled while a mold clamping force is generated by the electromagnet. Thus, it is possible to provide a mold clamping device which can improve the accuracy of the position for generating the mold clamping force in the relationship with the mold open/close drive unit.

Description

200902272 IX. DESCRIPTION OF THE INVENTION: TECHNICAL FIELD OF THE INVENTION The present invention relates to a control method for a mold clamping device. [Prior Art] Conventionally, in an injection molding machine, a resin is filled from a fixed mold and a movable injection nozzle.

L is solid, whereby a molded article is obtained. ^ Matching the space of the hole, and changing the mold to move the fixed mold and close the mold, and set it to move in the mold clamping device, although there is a mold and mold opening. The hydraulic type clamping device and the electric clamping device driven by ^^^^ are: the controllability of the electric clamping device is good, and it does not pollute the weekly drive = energy efficiency U 'So often use. In this case, the rotation of the ball screw is performed by == 吏, and the thrust is generated, and the thrust is amplified by the financial mechanism to generate a large clamping force. However, in the electric mold clamping device of this configuration, the toggle mechanism is used, and the characteristics of the toggle mechanism are difficult to change the clamping force, and the responsiveness and stability are poor, and the clamping force cannot be controlled during the forming. Because of this, a lock «Ϊ ’ is provided which can directly use the thrust generated by the ball screw as the clamping force. In this case, since the torque of the motor is proportional to the clamping force, the clamping force can be controlled during the forming. In the conventional mold clamping device, the load resistance of the ball screw is low, and not only a large clamping force cannot be generated, but also the locking force varies due to a torque variation of the motor. Also, in order to generate the clamping force, it is necessary to always supply the motor.

7041-968 8-PF 6 200902272 Current is supplied, because the motor cup is thunder, .^ · Power consumption 1 and heat generation are increased, so it is necessary to correspond to the motor's rated output' and the cost of the clamping device becomes expensive. A door-to-door type-locking device (for example, Patent Document 1) uses a linear motor in the mold m# and a suction-inch knife in the mold-locking operation using an electromagnet. [Patent Document 1] International Publication No. 05/090052 A SUMMARY OF INVENTION [Problem to be Solved by the Invention] The mold clamping device disclosed in Patent Document 1 is independently: a swaying portion and a lock for opening and closing Die (four) drive unit (electromagnet). Since the right is not suitable, "the timing of closing the mold and the timing of applying the clamping force are also controlled, and there is a possibility that the formation of the mold is poor or the mold is damaged. Examples] The right drive unit for opening and closing the mold before entering the mold clamping step = Limit value (4) 0 (When the drive unit for opening and closing the mold stops supplying power, the mold clamping force is generated during the period when the clamping force is released. Therefore, it is difficult to generate the clamping force at the desired position. However, the molding failure as described above may occur. = The method in which the soil is formed in the ultra-high precision forming "the tree is formed before the clamping force is applied. In this case, a number of "high-precision diameter systems" are required. The positional deviation of the mold of the quantity cannot be ignored. The present invention is in view of the above problems, and the developer provides a clamping mode and a clamping device, and the + ^ is controlled by a method such as " m control method. The device can improve the position of the mold clamping force in the relationship between the mold and the driving portion for opening and closing.

7041-9688-PF 200902272 degrees. [Means for Solving the Problem] Therefore, in order to solve the problem, the present invention is a mold clamping device having an electromagnet that drives a mold clamping operation and a mold opening and closing drive unit, which is characterized in that a clamping force is generated by the electromagnet to generate a clamping force. The mold opening and closing drive unit is controlled to be grounded. Further, the present invention is characterized in that the mold opening and closing drive portion is a linear motor, and the linear motor is supplied with a current required for position control in a step of boosting the electromagnet. Further, the present invention is characterized in that the linear motor is supplied with a current required for position control in the step of boosting the electromagnet. Further, the present invention is characterized in that the current is supplied to the linear motor until the clamping force of the electromagnet becomes a predetermined value. Further, the present invention is characterized in that the predetermined value is larger than the locking force of the linear motor. Further, the present invention is characterized in that the supply of current to the linear motor is stopped after the clamping force becomes a predetermined value. Further, the present invention is characterized in that after the clamping force is generated by the electromagnet, the current is supplied to the linear motor for a predetermined period of time. According to the present invention, it is possible to provide a mold clamping device and a control method for the mold clamping device which can improve the accuracy of the position at which the mold clamping force is generated in the relationship of the driving portion for opening and closing the mold. [Embodiment]

7041-9688-PF 8 200902272 The following is a reference to the figure. In addition, in the (4) and (4) planes, the movement of the movable platen when the mold is closed in the embodiment of the present invention will be described in detail. For the mold clamping device, the moving direction of the movable platen into the front will be set to be opened. In the injection device, the moving direction of the screw is set to the front direction of the screw, and the timing is measured. The 10 series lock 槎# is laid on the machine _ Fr Up, ... out of the frame of the forming machine 'Gd, and constitutes the obedience, and supports the clamping device 10, = two as the first guide | 2 guides (in the figure, only the machine and guide The table 13 is placed on the guide rail Gd±, and the fixed table as the i-th fixing member fixed to the guide rail Gd is used as the second fixing member, and the platen 13 is disposed so as to be spaced apart from the fixed platen 11 by The fixing table is opposite to the opposite direction 11, and four tie rods 14 (in the figure, only two of the four tie rods 14 are shown) are bridged between the fixed platen 11 and the back plate 13 In addition, the back plate 13 is placed on the guide rail Gd so as to be able to expand and contract with the tie bar 14 The guide rail Gd is slightly moved. Further, in the present embodiment, although the fixed platen 11 is fixed to the frame Fr, and the back plate 13 can slightly move the guide rail Gd, the back plate can be fixed to the frame Fr and the guide Gd. 13, and the fixed platen 11 is slightly moved to the guide Gd.

7041-9688-PF 9 200902272 Further, the mouth side tie rod 14 is configured to match the movable platen 12 as the first movable member with the solid platen i and to advance and retreat toward the mold opening and closing direction. (4) A guide hole (not shown) through which the tie bar 14 is inserted is formed in a portion corresponding to the tie bar 14 of the movable platen 12. θ The first screw portion (not shown) is formed at the front end portion of the tie bar 14, The cup 4 is fixed to the fixed portion 1 and the predetermined portion behind the respective tie rods 14 by screwing the first screw portion and the nut. The outer diameter is smaller than the tie rod 14 as the second guide. The guide post 21 of the member protrudes rearward from the rear end plate 13 and is formed integrally with the tie bar 14. The second screw portion (not shown) is formed in the vicinity of the rear end © of the back plate 13, by making the first 2 The screw portion and the nut n2 are screwed together to connect the fixed plate U and the back plate 13. In the present embodiment, the column 21 and the tie rod are integrally formed, and the core can be separated from the tie rod 14. The guide post 2 is formed in the ground, and the fixed mold 15 as the first mold is fixed to the left side of the fixed platen, and the movable mold 16 as the second mold is fixed. In the movable platen 12, the movable platen 12 advances and retreats, and the fixed mold 15 and the movable mold 16 are close to or separated from each other, and the mold closing is performed to mold clamping and mold opening. 'A plurality of cavity spaces (not shown) are formed between the boring mold 15 and the movable mold and 1 + " a resin (not shown) which is ejected from the injection nozzle 18 of the injection device 17 as a molding material is filled in Each of the cavity spaces is formed by the fixed mold 15 and the movable mold 16. The 'movable plate 12 is disposed in parallel with the movable platen 12 as the second movable member, and the attached plate 22' is disposed behind the back plate 13. It is arranged to be free along the guide post 21 and guided by the guide post 21. Further, in the adsorption plate 22, it will be used

7〇41-9688-PF 10 200902272 The guide hole 23 through which the guide post 21 is inserted is formed at a portion corresponding to each of the guide posts 21. The hole 23 is provided with a large dam portion 24, which accommodates the ball nut n2, and a small sigma opening 'to process the opening, and the bean has a rear end surface state of the adsorption plate 22, although the guide post 21 is used to guide the tomb, The shape 91-column bow guide adsorption plate 22 is implemented, but it is also possible to use not only the guide post 2 but also the guide rail Gd to guide the adsorption plate (2). Not only the guide column can be 疋 'in order to make the movable table 柘. B ^ mouth plate 12 advance and retreat The linearity of the drive unit (mold opening/closing drive unit) for wide opening and closing is set between the movable platen 12 and the frame 2. The linear motor 28 is provided as the first drive unit. The fixing member 29 of the retaining member and the movable member 31 as the second driving member are formed on the frame in such a manner as to be parallel to the guide Gd and corresponding to the movement of the movable platen 1 π. The fixing member 29 forms the movable member 31 at a lower end ' of the movable table shank plate ' opposite to the fixing member 29 and located within a predetermined range. The movable member 31 is provided with a core 34* coil 35. The core 34 i... has a plurality of magnetic poles 33' which protrude toward the fixing member 29, and A predetermined pitch is formed, and the coil 35 is wound around each of the magnetic pole teeth 33. Further, the magnetic pole teeth 33 are formed to be parallel to each other in a direction perpendicular to the moving direction of the movable platen 12. X, the fixed #29 (4) has an uncircular shape A core and a permanent magnet (not shown) formed by extending the core. The permanent magnet is formed by alternating magnetic poles of the drain and the S pole and magnetizing at the same pitch as the magnetic pole teeth 33. Thus, since the linear motor 28 uses a permanent magnet, the magnetic field formed between the fixing member 29 and the movable member 31 forms a strong magnetic field.

7041-9688-PF 11 200902272 The strength of the magnetic field is strong, and the magnetic force of the permanent magnet exerts a locking force on the movable member 31 at the locked position. It is necessary to supply the coil 35 with a current capable of overcoming the locking force because of 1^'. That is, when the linear motor is driven by supplying a predetermined current to the coil 35, the movable member 31 advances and retreats. As the movable platen 12 advances and retreats, mold closing and mold opening can be performed. Further, in the present embodiment, the permanent magnet is disposed in the fixed member 29, and the coil 35 is disposed in the movable member 3, but the coil may be disposed in the second: the permanent magnet is disposed in the movable member. In this case, since the coil is moved by the linear motor 28, the wiring for the electric power I, . The movable platen 12 advances, and the movable platen and the m (4) tool 16 and the mold 15 abut against each other, and then the mold is clamped. However, for the second drive unit, the electromagnet unit 37, which is the second drive unit and the lock unit, is placed between the rear yoke plate 13 and the suction plate 22. The suction cup gentleman, the beak rear mouth plate 13 and K, - are the lock r force value: and the rod 39 as the lock tension transmitting member connecting the movable platen 12 and the suction plate 22 is configured to be self-molded and open. And the movable platen 12; the wide 39 is closed and retracted, and during the clamping, the electromagnet unit 37 = 'and the adsorption plate U can move the platen 1 2 . The generated clamping force is transmitted to the other 'by the fixed plate u The movable platen; the attachment plate 22, the linear motor 28, the electromagnet unit = the orifice plate 13, the suction mold device 0, and the #39, etc. constitute the lock. The electromagnet unit 37 is formed on the side of the seesaw 13 as the first drive

7041-9688-PF 12 200902272 = electromagnet 49 and two second driving units formed on the side of the adsorption plate 22, and the portion 51 constitutes 'the adsorption portion 51 is formed in a predetermined portion of the end surface of the adsorption plate. In this embodiment, in the adsorption plate μ

It is surrounded by S 3 rods 3 and is inclined with the electromagnetic 4 9 A. The portion opposite to the magnet 49. Further, in a predetermined portion of the end surface of the rear sill plate 13, in the present embodiment, the knee eye + LU ritual, 10,000 will have a rectangular cross-sectional shape as a coil arrangement, slightly above and below the rod 39. The two grooves 45 of the portion are formed as a slap in the face, and the cores 46 having a rectangular shape are formed in the simple grooves of the grooves 45, and the yokes 47 are formed in other portions. And the coil 48 is wound around the core 46. Further, the core 46 and the yoke 47 are formed of a cast body structure, but may be formed by laminating thin plates made of a ferromagnetic material to form an electromagnetic laminated steel sheet. In the present embodiment, the electromagnet 49 is formed separately from the back plate 13, and the adsorption portion 51 is formed separately from the adsorption plate 22. However, the portion of the plate 13 is formed with an electromagnet to adsorb the two portions of the plate 22; Therefore, when the electromagnet unit 37 supplies a current to the coil 48, the electromagnet 49 is driven to adsorb the adsorption portion 51, and the clamping force can be generated. Further, the rod 39 is disposed so as to be continuous with the suction plate 22 at the rear end portion at the front end. Ρ Connect with the movable platen 丨2. Therefore, the rod 39 advances as the movable platen 12 advances when the mold is closed, and advances the suction plate 22, and when the mold is opened, the movable platen 12 retreats and retreats, and the suction plate 2 2 is retracted. Thus, a hole 41 through which the rod 39 is inserted is formed in the central portion of the back plate j 3 , and a hole 42 through which the rod 39 is inserted is formed in the central portion of the suction 7041-9688-PF 13 200902272 plate 22. The bearing member B11 such as a bushing that slidably supports the rod 3g is disposed to face the front end portion of the hole 41. Further, the screw 43 is formed at the rear end portion of the rod 39, and the wire 43 is screwed to the nut 44 as a mold thickness adjusting mechanism which is supported to rotate the suction plate 22 freely. However, at the time when the mold closing ends, the adsorption plate 22 approaches the background plate 13, and although the gap d is formed between the background plate 13 and the adsorption plate 22, the gap is not too small or too large, and the adsorption portion cannot be sufficiently adsorbed. 5 Bu: The clamping force becomes smaller. On the other hand, the optimum clearance δ is changed to the thickness of the mold skirt 19, so that a large-diameter gear (not shown) is formed on the outer circumferential surface of the nut 44, and the driving portion for adjusting the thickness is not shown. The mold thickness adjustment motor is disposed on the suction plate 22', and a small-diameter gear attached to the output end of the mold thickness adjustment motor and a gear formed on the outer circumferential surface of the nut 44 are sprayed. Further, in response to the thickness of the mold device 19, the die thickness adjustment port motor is driven to adjust the position of the rod suction plate 22 when the nut 44 is rotated by the screw 43, and the suction plate 22 is adjusted to the fixed platen u and a Position of the board 12, the gap 5 can be set to an optimum value. That is, the mold thickness is adjusted by changing the relative positions of the movable platen 12 and the suction plate 22. Bu by "Hai mold thickness δ week, the motor, gears, nuts and 39 to form a mold thickness adjustment device. Also, the gear is made to dry to the nut

The rotation transmission unit that adjusts the rotation of the motor for weight adjustment. Further, the nut 44 and the screw 43 constitute a movement direction changing portion, and the rotational motion of the motion direction changing portion is converted into a rod" and linearly moved. In this case, "the first conversion element is constituted by the screw 43". 2 Conversion element: Item 7041-9688-PF 14 200902272 The control unit 60 controls the linear motor of the mold clamping device 10 and the driving of the electromagnet 49. The control unit 6A includes a circuit such as a CPU and a memory, and supplies a current to the coil 35 of the linear motor 28 or the coil 48 of the electromagnet 49 in response to the calculation result of the CPU. The load detector 55 is also connected to the control unit 6A. The load detector 55 is disposed at a predetermined position of the at least one tie rod 14 (a predetermined position between the fixed platen n and the back plate 13) in the mold clamping device, and detects the load applied to the tie bar 14. In the figure, the example in which the load detector 55 is provided on the upper and lower two tie bars 14 is shown. The load detector 55 is constituted, for example, by a sensor that detects the amount of elongation of the tie rod 14 by transmitting the load detected by the load detector 55 to the control unit 6A. Further, the control unit 6 省略 is omitted from the second figure. The mold opening/closing processing unit 61 of the control unit 60 controls the closing. The state of the figure (the state at the time of mold opening), the mold opening and closing processing unit 61 supplies current to the coil 35. Next, the drive position E 4 〇 % is advanced, and the motor 28' is sensed, and the movable platen 12 is brought into contact with the mold 15 at this time. Between the second plates 22, that is, the electromagnets 49 and the adsorption 曰1 form a gap (5. Further, the mold closing soil is followed by the lock of the control portion 60, and the clamping force is controlled by the mold clamping portion 62. The mold step, the slab processing unit _ electric "^_485, step lock additional adsorption adsorption portion 51. With the suction of the neodymium magnet 49, the passer is transmitted to the movable platen 12 via the adsorption plate 22 and the 扭μ 掇 掇 force, # ^ Talent 39 will lock the lock into the mold. Under this structure, the Λ too extravagant form 'starts the mold clamping, etc., change Τ in this implementation will be used to generate the cause of the servant, lock processing Department 62 controls the production of money and rides to become the target (four) mold force, that is,

7041-9688-PF 15 200902272 Steady-state current due to the steady-state target π force (hereinafter referred to as the "steady-state clamping force") (the value is supplied to the coil 48. This electric power is referred to as "rated current". The force is detected by the second IT load detector 55. The detected mode-locking cold-pressing device 4 60 ' adjusts the electric power supplied to the coil 48 at the control unit 60; the radiation = feedback control 'to make the clamping force become the set value. During this period, the resin melted by the injection nozzles 18 is ejected from the injection nozzles 18, and is filled in the cavity spaces of the mold device 19. When the resin in each cavity space is cooled and becomes solid, the mold opening and closing processing unit 61 controls the mold opening step at the top, and the die processing unit 62 stops the supply of the current to the coil 48 in the state of Fig. 1 . 'The linear motor 28 is driven, and the movable platen 12 is retracted. As shown in Fig. 2, the movable mold is retracted to the extreme position, and the mold is opened. Silly Describes the mold closing step and the mold clamping step in more detail. Fig. 3 is a view for explaining the operation of the mold clamping device in the mold closing step and the mold clamping step. In the first _, it means 4 lines or curves. The horizontal axis of the graph represents the pair: the time (elapsed time) in which the polyline or curve is common. The vertical axis of the graph varies depending on each fold line or curve. The broken line a indicates the torque output limit (limit value) of the linear motor 28 that is rotated by the mold opening/closing processing unit 61 of the control unit 60. About the polyline The axis represents the torque value. Curve b represents the position of the platen 12 that can be moved by the linear motor 28. Regarding the curve b, the vertical axis represents the position. Polyline _ Self-control unit 6. The command value of the clamping force output from the mold clamping processing unit 62 is not the curve d indicating the actual clamping force detected by the load detector 55.

7041-9688-PF 16 200902272 On the fold line C and curve d, the vertical axis represents the magnitude of the clamping force. The pattern of the SI, 'time ti to t2, corresponds to the closed mode: the mode locking device 10 is in the state shown in Fig. 2 at time t1, and becomes the state shown in Fig. 1 between the temples t2. The closing step in Fig. 3 consists of a running section and a low pressure section. In the two rooms, the current supply line is widened by one day and the "lighting interval" is started under the control of the mold opening and closing processing unit 61. In the travel section, as shown by the fold line a, the wide-opening and opening-closing processing unit 61 inputs the result of the command "The limit becomes the maximum" to the linear motor 28, such as a curve, "the direction of the board is shown to the front" in the direction of the contact position, and the speed is high. In conjunction with this, the gap 5 between the background = and the suction plate 22 also reduces only the front of the linear motor 28. By moving the movable platen 12 at a high speed in the running section, the forming cycle can be shortened and productivity can be improved. When the nuclear opening and closing processing unit 61 detects that the position of the movable platen 12 has reached the preset low pressure start position (the start position of the low pressure section), the inner motor 28 is inserted into the inner motor to reduce the torque output to the value. The command of the (low-pressure torque) is provided in the linear material 28, and the position of the linear motor 28 (that is, the position of the movable platen 12) is input from the position detector to the control unit 6 Information. The precision is reduced by the torque output limit, and the clamp between the molds = bad. With the curve, as shown by the curve b, the movable platen:

The position control is performed in a state where the die plate 12 (linear motor 28) is sufficiently decelerated to the extent that the device 19 is sufficiently damaged, and when the mode t2 reaches the mold clamping start position, the position is stopped according to the position control. 7041-9688-PF 17 200902272 After time t2, it is equivalent to the mode-locking step. Here, in the case where the electromagnet 49 is used for the mold clamping, the gap is changed by the gap (the interval between the five is generated by the electromagnetic force). When the electromagnetic force is generated, the gap <5 becomes a large state. Therefore, the current is made. It is time-consuming to start the flow of the electromagnet 49 until the predetermined mold clamping force is generated between the dies, which is time consuming. In addition, in the ultra high precision molding, there is a method of forming the opening of the resin before the mold is completely abutted. With the mold clamping device 1 of the electromagnet 49, the opening f-gap 5 when the electromagnetic force is generated is larger when the opening is formed than during the normal forming. Therefore, it takes time to generate the lock 'modulus force. In this case, strictly ' In the case where the mold is not abutted (contacted) 2 ' After the electromagnetic force is generated, the mold clamping step begins. Considering this point, in the form of the application, the "mold contact position" means that the mold clamping step should be performed regardless of the contact of the mold. The position of the movable platen 12 at the beginning. The part SSI: indicates, at the mold contact position (time t2), the mold clamping process, and the heart generates a steady state clamping force command. The system is based on the finger 2 The frontal current is supplied to the wire of the electromagnet 49 The gap between the ring 48 f 13 and the suction plate 22 is i ^ _ , which is the magnetic force of the king. Therefore, if the curve is d, the electromagnetic force generated by the electromagnet 49 increases, and the clamping force is increased. As the clamping force increases, the time clamping force increases.

The movable mold 16 is in contact with the fixed mold 15, and the =2/^' is formed at the time U opening, and the mold is closed with the mold and n. At this point, it is shrinking. If the curve d-- is narrow and the filled resin is pressed to the depth d, the clamping force is increased to the rated clamping force, and then, after the mode-locking is continued, the time is reached at time h. At the moment, 'the rated clamping force is maintained. The clamping force at the main time h reaches the step of the step-up force in the mode-locking step.

7041-9688-PF 18 200902272 On the other hand, after the mold opening and closing treatment portion 61 reaches the mold contact position, 'the position control for holding the position of the movable platen 12 at the mold contact position is also performed on the linear motor 28. The coil 35 continues to supply current. However, as indicated by the broken line 3, the torque output limit after reaching the mold contact position is lowered to prevent the net kingdom (holding torque) of the positional deviation of the linear motor 28 from occurring due to the locking force. Also, too pq, /, and? The knife is again formed in the opening, and even if the resin is filled, the output of the linear motor 28 becomes an output that can counteract the waste force of the filled resin to prevent the linear motor 28 from retreating. The mold clamping force generated by the electromagnet is increased, and when the force of the linear motor 28 is negligible (that is, when the clamping force is relatively large) (at time t3 in the drawing), the mold opening and closing processing portion 61 is variable. The supply of current to the coil 35 of the linear motor μ is controlled. Specifically, the supply of current is stopped. Therefore, the influence of the positional control of the linear motor 28 on the clamping force is lost: the timing of stopping the supply of current to the coil 35 may not be based on the clamping force, but the passage of time. _, it is also possible to pre-calculate the time until the clamping force becomes greater than the locking force after the start of the clamping j, or to supply the current during the time according to the empirical value, and stop the supply of current after the period elapses. . In this way, after the electromagnetic force is generated, between the mold clamping force of the linear motor 28: the output is increased, and the opening is formed by continuously supplying the current to the linear motor 28 even if the injection operation is performed before the end of the mold closing. It is also possible to prevent the tree from coming between the movable mold 16 and the fixed mold 15: leaking.

Further, in the running section, the money section, and the mode locking step, it is also possible to reduce the torque output limit of the linear motor 28 in multiple stages. 7041-9688-PF 19 200902272 As described above, according to the mold clamping device 10 of the present embodiment, after the start of the mold clamping step (the process of increasing the clamping force), the current is also supplied to the linear motor 28 to control the position to The mold contacts the position. Therefore, the deviation of the mold contact position caused by the locking of the linear motor 28 can be prevented, and the clamping force can be generated from the predetermined position (the mold contact position). Therefore, the incidence of poor molding or the like can be reduced. In the present embodiment, the electromagnet 49 is formed on the rear end surface of the back plate 13, and the electromagnet 49 is disposed in the front end surface of the suction plate 22 so that the upper portion 51 can be moved forward and backward as opposed to the electromagnet 49. The adsorption portion is disposed on the rear end surface of the rear port plate 13 and is disposed on the front end surface of the adsorption plate 22 so as to be movable forward and backward so as to face the suction qis and the σ 卩. Further, in the method of controlling the mold clamping device of the present embodiment, the mold clamping device that performs the mold opening and closing operation by the driving of the linear horse 4 28 may be used. Especially in the case of the linear motor 28, the flame is abrupt, and since the magnet is exposed on the surface of the frame, dust or the like may adhere. Therefore, the Ganzi 4 diagram does not function as a mold and opens and closes the drive unit, and does not use the linear motor 28, but applies a modified example of the present invention to the rotary motor in which the motor frame is blocked by the motor frame. Since the description of the electromagnet of the second driving unit is the same as that of Figs. 1 and 2, the description thereof is omitted. The cooker opening/closing motor 74, which is a drive unit for mold opening and closing (mold opening and closing drive, ηκ布勒邛), is attached to a motor support 73 fixed to the machine. Here, the pepper opening and closing motor 74 is applied to a rotary motor in which a magnetic field generating region is sealed by a motor blizzard # ia frame. Motor shaft not shown 你 No glaze protrudes from the rotary motor, and the shaft and ball screw shaft 72 are connected. By rolling the boring shaft 72 and the ball screw

7041-9688-PF 20 200902272 : The screwing mechanism constitutes a motion direction changing device that converts the rotational motion generated by the rotary motor into a linear motion. Further, the ball screw nut is rotatably disposed to be slidable from the lower portion of the movable platen 12 to the edge portion 12a. Therefore, the mold opening/closing motor 74 is rotated, and the plate 12 can perform the mold opening and closing operation of the movable mold 6 in the front and rear. Further, the position detector 75 is attached to the rear end of the mold opening/closing motor 74, and the position of the movable platen 12 can be grasped by the rotation angle of the mold opening/closing motor 74. Thereby, the mold opening and closing processing unit 61 controls the mold opening 74. In the present configuration, in the case where the mold clamping force is generated by the electromagnet on the mold unit 丨 9, more specifically, after the start of the pressure increase, the mold opening and closing processing unit 6 is variably controlled without fear of occurrence of the positional deviation of the mold. Supply of current to the mold opening/closing motor 74. Specifically, the supply current is stopped. Therefore, the influence of the positional control of the mold opening/closing motor 74 on the clamping force is lost. The present invention is not limited to the specific embodiment, and various modifications and changes can be made without departing from the spirit and scope of the invention. This International Patent Application claims the priority of the present patent application No. 2007-134623, filed on May 21, 2008, the entire contents of which is incorporated herein by reference. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a mold apparatus and a lock mold of an embodiment of the present invention.

7041-9688-PF 21 200902272 Diagram of the state when the mold is closed. Fig. 2 is a view showing a state of a mold apparatus and a mold clamping mold according to an embodiment of the present invention. Fig. 3 is a view for explaining the operation of the mold clamping device in the mold closing step and the mold clamping step. Fig. 4 is a view showing a modification of a rotary motor to which a region where a magnetic field is generated is blocked by a motor frame. Main component symbol description 10 Clamping device, 11 fixed platen, 12 movable platen, 13 back plate, 14 tie rods, 15 fixed molds, 16 movable molds, 17 shots, 18 injection nozzles, 19 molds | 21 guide columns, 22 adsorption plates, 23 guide holes, 24 large diameter sections, 25 small diameter sections,

7041-9688-PF 22 200902272 28 Linear motor, 29 fixing parts, 31 movable parts, 33 magnetic pole teeth, 34 iron core, 35 coils, 37 electromagnet unit, 39 rods, 41 holes, 42 lifting assembly, 43 screws, 44 nuts 45 slots, 46 cores, 47 turns, 48 coils, 49 solenoids, 51 suction sections, 55 load detectors, 60 control sections, 61 mold opening and closing sections, 62 mold clamping sections, δ gaps, nl nuts, 23

7041-9688-PF 200902272 B r 1 bearing member, Gd rail, F r frame. twenty four

7041-9688-PF

Claims (1)

200902272 X. Patent application scope: 1. A type of clamping device, which has an electromagnet that drives a clamping action and a mold opening and closing driving portion, 'characterized by: variably controlling the molding force by generating a clamping force by the electromagnet unit. 2. If you apply for a patent range! The mold clamping device is disposed, wherein the mold and the opening and closing driving portion are linear motors; and the current required for the position control of the linear motor is supplied by the step of boosting the electromagnet. 3. If you apply for a patent scope! The clamping device of the item, wherein the closed driving portion is a rotary type motor; ..., the required current is controlled by the boosting step t φ of the electromagnet. The rotary motor is supplied to the position of the rotary motor. The clamping device of the first aspect of the patent, wherein the clamping force to the (four) electric iron becomes a predetermined value, the current is supplied to the linear motor. ... 5. The lock mode of item 4 of the patent application is greater than the locking force of the linear motor. - 〇 〇 6 6 如 如 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 The iron produces a clamping force of the clamping force # y $, wherein after the clamping force is generated by the electromagnet, the control method of the 8.-type clamping device is automatically grasped during the predetermined period. And the mold opening 'device-with drive lock 7041-9688-PF 25 200902272 is characterized in that: the mold opening and closing drive portion is variably controlled in the mold clamping force generated by the electromagnet. The control method of the device, wherein the mold opening and closing driving portion is a linear motor; and the linear motor is supplied with a current required for position control in a step of boosting by the electromagnet. ▲ 10· The clamping mode according to item 8 of the patent application scope The control method of the device, wherein the mold opening and closing driving portion is a rotary type motor; and the rotating type motor is supplied with a current required for position control in a step of boosting the electromagnet. The control method of the clamping device, wherein the clamping force of the electromagnet becomes a predetermined value, and the linear motor is supplied to the one person as in the control of the eleventh item of the patent scope, wherein the predetermined value is greater than the linear The locking force of the motor is greater. ^If the towel is in the control method of the clamping device of the scope of the patent item u, ^ stop the supply of the electric motor to the linear motor after the _ mold force becomes a predetermined value. The path method of the i, Λ _ _ ^ π I, wherein the current is supplied to the current after the electromagnet generates the clamping force. The linear motor 7041-9688-PF 26