JPS6061222A - Injection molding device - Google Patents

Abstract

PURPOSE:To produce simply a multicolor molded product by molding the product, using the device in which a plurality of fixed molds are vertically arranged in parallel on a fixed platen and the vertically movable mold cooperating with said fixed molds is provided on the movable platen capable of advancing to or retracting from said fixed platen. CONSTITUTION:A core mold 29 is placed at a position A, and a movable plate 26 is advanced to a fixed platen 21 and then the core mold 29 and a cavity mold 22 are clamped. Molten resin is injected into the product molding part between the core mold 29 and the cavity mold 22. After it has been cooled, the core mold 29 is pulled up to a position B by an oil pressure cylinder 32, retracting the movable platen 26. Next, the core mold 29 and cavity mold 23 are mold-registered, and then into said molds, the resin with a different color from said resin color is injected and is welded to the product molded at the position A. Finally the product W is extruded by an extruding device 36 at a position C. Thus, multicolor molding may be simply achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an injection molding machine that has a plurality of injection cylinders for injecting resins each having a different color, and is capable of performing multicolor molding.

(Prior art) When molding one resin product by combining many types of resin parts with different colors, the resin is divided into multiple stages from a number of cylinders that inject resins of different colors, and the resin is divided into one mold. Molding the product.

FIGS. 1A to 1D are plan side sectional views showing an injection molding apparatus conventionally used for performing multicolor molding.

In the injection molding apparatus shown in FIG. 1, four core molds are attached to a rotary disk 2 rotating around a vertical axis 1 at 90 degrees intervals, and primary cavity molds 4 are arranged facing each other around the rotary disk 2. and a secondary cavity mold 5 are installed. The secondary cavity mold 5 is attached to a fixed platen 6, and the primary cavity mold 4 is attached to a movable platen 9 that is slidable on a tie bar 8 fixed between the fixed platen 6 and a back plate 7. . The rotary disk 2 is also movable in the horizontal direction,
With the rotary disk 2 and movable platen 9 pressed against the fixed platen 6 side, the resin injected from the injection cylinder 10 is molded between the primary cavity mold 4 and the core mold 3, and the molded product is molded here. The resin injected from the injection cylinder 11 is integrally molded between the secondary cavity mold 5 and the core mold 3 for the product W1. Therefore, the recess formed in the secondary cavity mold 5 is similar to that of the primary cavity mold 4.
As the rotation W2 rotates in the direction shown by the arrow, the product W is removed from the core mold 3 at position A through position 8, position C, and core mold 3 at position D. will be carried out.

The injection molding apparatus shown in FIG. 1(B) has two core molds 3a attached to a rotary plate 2a rotating around a horizontal axis 1a, and fixed between a stationary plate 6a and a back plate 7a. A rotary disk 2a is attached to a movable platen 9a which can slide freely on the tie bar 8a. The fixed platen 6a has a primary cavity mold 4a and a secondary cavity mold 5.
a is attached.

As shown in FIG. 1 (Δ) and (B), an injection molding apparatus of the type in which molds are exchanged by rotating rotary disks 2 and 2a has the advantage of improving productivity. However, there was a problem in that it was not possible to mold large products and was limited to molding small products. This is because if the core mold is made large in order to mold a large resin product, the rotary disks 2, 2a themselves will become large, making it difficult to put them into practical use. For example, when injection molding a long, large product such as a car bumper, it is not only necessary to make the work easier.
In order to improve the circulation of molten resin, products are usually formed in a horizontal position, and when a core mold for molding such long objects is attached to a rotary disk, the entire device becomes extremely large. This is because

The injection molding apparatus shown in FIG. 1(C) is for molding large resin products in multiple colors, and has two injection cylinders 10.
The core mold 3b is attached to the movable platen 9b which can freely move forward and backward relative to the fixed platen 6b having the fixed platen 6b and 11b. Two cavity molds 4b and 5b having partially different shapes are attached to the reciprocating plate 12, which is movable in the longitudinal direction. Since this device moves a large cavity mold horizontally for molding large products, a wide installation requires a large area, and the cavity molds 4b and 5b are moved horizontally with a long stroke suitable for long objects. This poses problems in that it not only takes time to move and lengthens the molding cycle, but also reduces the strength of the fusion bond between the two types of resins and increases deformation of the product. In addition, this device requires special consideration for safety during movement of the cavity molds 4b and 5b.

In the injection molding apparatus shown in FIG. 1(D), the movable core 13 is attached to a part of the core mold 3C, and the cavity mold 4C is shifted to the left and right in the drawing by one core mold 3c and one cavity mold 4c, respectively. injection cylinder 1
0c and 11c are used to perform multicolor molding, but since this device displaces the product molding section only by shifting using one cavity mold 4c, it is difficult to mold large products. is possible, but there is a problem in that the shape of the product that can be molded is limited.

(Purpose of the Invention) The present invention is aimed at making it possible to quickly move a mold, thereby shortening the molding time, and bonding various types of resins with different colors etc. with each other with high fusion strength. The purpose is to obtain.

(Structure of the Invention) In order to achieve this object, the present invention includes vertically arranging a plurality of fixed molds in which resin is press-fitted from injection cylinders into a fixed platen fixed to a base, and This is an injection molding apparatus in which a movable mold that cooperates with the fixed mold to form a product molding part is attached to a movable platen that can freely move forward and backward with respect to the platen so as to be movable up and down. Furthermore, a plurality of fixed molds into which resin is press-fitted from injection cylinders are vertically arranged in a fixed platen fixed to a base, and a movable platen that can freely move forward and backward with respect to the fixed platen is arranged in parallel with the fixed molds. A movable mold that cooperates with the mold to form a product molding part is mounted so as to be movable up and down, and the end of the mold mounting plate to which the fixed mold or movable mold is mounted is connected to the fixed or movable platen. A wedge member that is reciprocated by a hydraulic cylinder is attached to a clamp body that is guided so as to be vertically movable between the clamp bodies, and the wedge member is rotatably supported by a support bin fixed to the clamp body and its tip engages with the wedge member. This is an injection molding apparatus in which a guide roller that supports the end of the mold mounting plate is attached to a frame, and the support bin is attached at an angle with respect to the guide roller.

<Example> The present invention will be described below based on the drawings shown in FIGS. 2 to 7. FIG. 2 is a front view of an injection molding apparatus according to an embodiment of the present invention, in which a fixed platen 2 fixed to a base 20 is shown.
1 has two cavity molds 2 arranged vertically next to each other.
2.23 is installed as a fixed mold. The lower cavity mold 22 is a cavity mold for primary molding, and the upper cavity mold 23 is a cavity mold for secondary molding, and the four parts 23a of the upper cavity mold are smaller than the four parts 22a of the lower cavity mold. is also getting bigger.

A movable platen 26 is attached to a tie bar 25 fixed between the fixed platen 21 and the pressure platen 24 so as to be movable forward and backward with respect to the fixed platen 21. is mold clamping cylinder 2
7.28 is installed.

A core mold 29 as a movable mold is attached to the movable platen 26 so as to be movable up and down. A second stage in which the resin from the injection cylinder 31 is injected into the product molding section between the cavity mold 23 and the Δ position indicated by the imaginary line for performing resin molding in the first stage in which resin is injected. It is possible to move to position C shown by the imaginary line for performing resin molding of the eyes, and position C for taking out the product molded at these positions A and C. In order to move the core mold 29 up and down in this way, the moving platen 26! A rod 33 of a hydraulic cylinder 32 as a mold conveying device attached to the core mold 29 is connected to the core mold 29 .

Product W after completion of molding from the core mold 29 at the C position
In order to take out the
The extrusion bottle 35 built into the core mold 29
An extrusion device 37 that operates via a mounting plate 36 to which it is fixed is attached to the movable platen 26 at a position corresponding to the C position.

The core mold 29 is fixed at the A position or the C position shown in FIG.
must be clamped to the moving platen 26. Also,
Two cavity molds 22 and 23 having arbitrary shapes corresponding to the core mold 29 need to be removably clamped in a predetermined position on the fixed platen 21. Therefore, clamp means are attached to the movable platen 26 and the fixed platen 21, respectively. Figures 3 to 7 show the fixed platen 21
FIG. 3 is a diagram showing a fixed side clamping means attached to the moving platen and a moving side clamping means attached to the movable platen, and the fixed side clamping means and the moving side clamping means have substantially the same structure.

A clamp body 40 is fixed to the platen 21.26, and a guide for guiding the end of a mold mounting plate (die plate) 41 to which a mold such as a core mold 29 or a cavity mold 22.23 is fixed. A space 42 is formed in the clamp body 40 as shown in FIG. Therefore, the end of the mold mounting plate 41 is guided by the clamp body 40 within the guide space 42 and is movable up and down, and a core mold 29 or cavity mold 22 of a predetermined shape is provided at the lowest part of the clamp body 40. .23 from the outside to the injection molding apparatus and also to carry it out from the injection molding apparatus to the outside, the injection molding apparatus is provided with a mold carrying means 43 such as a roller conveyor, as shown in FIG. .

As shown in FIGS. 4 to 6, the clamp body 40 includes a frame 45 having a roughly Y-shaped cross section and is rotatable around a support bin 44.
A guide roller 46 is rotatably attached to the frame 45 so as to contact the end surface of the mold mounting plate 41 and guide it vertically. frame 4
5 is engaged with a hole 49 formed in a wedge member 48 that is reciprocated by a hydraulic cylinder 47, and the frame 45 is rotated around the support bin 44 by the hydraulic cylinder 47. At the same time, due to the contact between the inclined surface 50 formed on the wedge member 48 and the inclined surface 51 formed on the clamp body 40, the mold mounting plate 41
I'm trying to clamp it.

FIG. 7 corresponds to an arrow view (partially enlarged view) in the direction indicated by the arrow ■ in FIG. 6, and is a diagram showing the state of inclination between the axis o1 of the guide roller 46 and the axis 02 of the support bin 44. The axis 01 of the guide roller 46 is substantially horizontal, whereas the axis 02 of the support bin 44 is inclined downward by -F. Therefore, when the horizontal member 48 is pushed down by the hydraulic cylinder 47, the guide roller 46 moves downward and approaches the platen 21.26 because the support bin 44 is tilted. At the same time, the wedge member 48 is pushed against the mold mounting plate 41 and clamps the mold mounting plate 41 between it and the platen 21.26. Conversely, the horizontal member 4 is connected to the hydraulic cylinder 47.
8 is pushed upward, the guide roller 46 moves upward and separates from the platen 21.26, and when the clamp of the mold mounting plate 41 attached to the wedge member 48 is released, the mold A gap S is formed between the mounting plate 41 and the platen 21.26, as shown in FIG. 5, so that the mold mounting plate 41 can easily move up and down. Incidentally, the inclination angle θ of the support bin 44 is determined by the required dimension of the gap S and the vertical stroke of the horizontal member 48, and can be set to any angle. Further, the support bin 44 may be tilted horizontally. And 5
2 and 53 are bushes, and 54 is a solid lubricant.

The illustrated embodiment is an injection molding apparatus for molding one product using two colors of resin: resin from an injection cylinder 30 and resin from an injection cylinder 31.
As shown in Fig. 3, there are two clamp bodies 40 in upper and lower stages
The platen 26 is further provided with a clamp main body 40 corresponding to the C position, but each clamp main body 40 has two upper and lower parts as shown in FIG. Each transverse member 48 is attached. Further, two frames 57 having guide rollers 56 to which elastic force is applied by springs 55 are attached to each clamp body 40.

Next, the effect will be explained. First, the procedure for assembling a predetermined core mold 29 and cavity molds 21 and 22 into an injection molding apparatus will be explained.
3, the core mold 29 is installed on the moving platen 26. Next, after the cavity mold 23 for secondary processing is installed on the fixed platen 21 by the mold carrying means 43 on the fixed side, the movable platen 26 is brought close to the fixed platen 21, and the mold is loaded by the hydraulic cylinder 32 via the core mold 29. Ki V for secondary processing
The biddy mold 23 is raised and a cavity mold 23 for the next primary processing is carried in. and two cavity molds 22.
23, the hydraulic cylinder 47 in the clamp body 40 on the stationary side is operated to clamp the cavity molds 22 and 23. In this way, the mold 22, 23, 29 can be quickly installed in the injection molding device.

Next, in order to mold a resin product, the core mold 29 is installed at the position shown in FIG. Do the following.

At this time, the mold clamping cylinder 27 is under high pressure, and the mold mounting plates 41 of both the core mold 29 and the cavity mold 22 are clamped between the wedge member 48 and the platen 21.26. Next, the injection cylinder 3o moves forward and pours the molten resin into the core mold 29 and the cavity mold 22.
Press fit into the product molding part between. After the movable platen 26 is cooled, the hydraulic cylinder 47 of the clamping means on the movable side is activated to release the clamp between the wedge member 48 and the movable platen 26, and the core mold 29 is moved by the hydraulic cylinder 32 to the position B in FIG. lifted into position.

Then, the core mold 29 is clamped again, and the movable platen 26 moves forward to align the core mold 29 and the cavity mold 23. Next, the injection cylinder 31 moves forward, and the resin is press-fitted into the mold, and the resin from the injection cylinder 31 is integrated with the molded product at the A position. The movement stroke of the core mold 29 from the 8th position to the B position described above is because the core mold 29 moves in the vertical direction.
Even if the product to be molded is long and large, it will be extremely small, so the mold can be quickly changed from primary molding using the cavity mold 22 to secondary molding using the cavity 23, and the molding cycle can be shortened. It gets faster. As a result,
The quality of the molded product can be improved without reducing the welding strength of the resin, while saving energy in the heat source for melting the resin.

Next, after cooling, the movable platen 26 is moved back, and the "A" mold 2 is moved back.
9 is released, and the core mold 29 is pulled up by the hydraulic cylinder 32 to position C shown in FIG. This C
At this position, the extrusion device 36 extrudes the pickled product W, and the ejector 34 sends it to the next process. In this way, by installing the extrusion device 36 at the top of the moving platen 2G, it becomes possible to take a very large extrusion stroke for taking out the product W.

In addition, an extrusion device 36. Since there is no
It has a simple structure and is advantageous in terms of strength. As described above, after one index molding step is completed and the core mold is lowered to the eight position, the next molding cycle begins.

The core mold 29 as a movable mold is fastened to the movable platen 26 at each position of AlB and c, and this fastened state is easily released when the core mold 29 moves up and down. The clamping means is attached to the core mold 29.
When the mold mounting plate 41 is moved up and down between positions C, the guide roller 46 guides the mold mounting plate 41, so that a sea urchin shown in FIG. The core mold 29 can be smoothly moved up and down while forming a gap. When the core mold 29 is fastened to the movable platen 26, the hydraulic cylinder 47 is operated and the sixth
The wedge member 48 shown in the figure is moved downward. Then, the wedge member 48 is brought into contact with the mold mounting plate 4 due to the contact between the inclined surfaces 5o and 51.
1 is pushed toward the movable platen 26 side, and since the support bin 44 is inclined at an angle θ as shown in FIG. It will move toward the moving platen 26.

Therefore, the movable platen 26 with respect to the mold mounting plate 41
The wedge member 48 and the wedge member 48 come into surface contact, and the core mold 29 is reliably fastened by frictional force. To release this fastening, operate the hydraulic cylinder 47 in the opposite direction.
The contact between the moving platen 26 and the mold mounting plate 41 is released,
The two core molds can be easily moved.

And optionally as a fixed mold in the injection molding equipment: 1:
When installing the Sevitae F type 22, 23 on the identification platen 21, it is necessary to securely clamp it to the fixed platen 21, but for this purpose, a clamping means not shown in Figs. 3 to 7 is used. cage, fixed platen 21 and wedge member 4
The fastening and unfastening operations of the mold mounting plate 7'11 with the mold mounting plate 7'11 are the same as those described above. In addition, in Fig. 4, there are two wedge members 4 on the upper and lower sides of the clamp body/IO.
8 is provided, but since these are in opposite directions, 4! when clamping and when unclamping. I
! The moving directions of the members are mutually opposite directions. In addition, in the injection molding apparatus of the illustrated embodiment, two cavity molds are arranged side by side at the bottom, so two-color molding is performed, but three or more cavity molds are arranged vertically side by side on a fixed platen. For example, multi-colored molding of two or more colors becomes possible.

(Effects of the Invention) As described above, according to the present invention, a plurality of fixed molds into which resin is press-fitted from an injection cylinder are vertically arranged in parallel to a fixed platen fixed to a base, and the fixed platen is fixed to a base. A movable mold that cooperates with the fixed mold to form the product molding part is attached to the movable platen, which can move forward and backward, so that it can move up and down. This has made it possible to perform resin molding, reduce the installation area of the injection molding equipment, shorten the molding cycle by shortening the mold opening/closing stroke, and achieve energy savings while eliminating a drop in resin welding strength.

In addition, a wedge member that reciprocates with a hydraulic cylinder is attached to the clamp body that guides the end of the mold mounting plate on which a fixed mold or a movable mold is attached so that it can move up and down between the fixed or movable platen. , a guide roller that supports the end of the mold mounting plate is attached to a frame that is rotatably supported by a support bin fixed to the clamp body and whose tip engages the wedge member; Since the guide roller is mounted at an angle with respect to the guide roller, clamping and unclamping of a fixed mold or a movable mold to a fixed platen or a movable platen can be easily performed, and it is also possible to change setups when molding products of other shapes. is done quickly. Moreover, when the movable mold moves up and down, the number of molds is guided by guide rollers.
The mold can move up and down smoothly.

[Brief explanation of drawings]

FIG. 1 (Δ) to (D) are plan sectional views showing a conventional injection molding apparatus, and FIG. 2 is a front view showing an injection molding apparatus of the present invention.
Figure 3 is an enlarged side view of the main parts with parts of Figure 2 omitted;
The figure is an enlarged side view of the main part of Figure 3, and Figure 5 is v-v of Figure 4.
6 is a perspective view showing the frame shown in FIG. 5, and FIG. 7 is an arrow directional view showing the positional relationship between the guide roller and the support pin in the direction of the arrow {circle around (2)} in FIG. 6. 20... Base, 21... Fixed platen 22.23.
...Cavity type, 26...Moving platen, 29...
・Core type, 30.31... Injection cylinder, 40...
Clamp body, 41...Mold number 1 plate, 44...Support bin, 45...
... Frame, 45a... Engagement bin, 46... Guide roller, 47... Hydraulic cylinder, 48... Wedge member. Patent applicant Nissan Motor Co., Ltd. Figure 3 Figure 4

Claims (2)

[Claims] (1) A plurality of fixed molds into which resin from an injection cylinder is press-fitted are arranged vertically in a fixed platen fixed to a base, and fixed to a movable platen that can freely move forward and backward with respect to the fixed platen. An injection molding device that is equipped with a movable mold that is movable up and down and that works together with the mold to form a product molding section. (2) A plurality of fixed molds into which resin is press-fitted from injection cylinders are arranged vertically in a fixed platen fixed to a base, and fixed to a movable platen that can freely move forward and backward with respect to the fixed platen. A movable mold that cooperates with the mold to form a product forming part is mounted so as to be movable up and down, and the end of the mold mounting plate to which the fixed mold or movable mold is mounted is connected to the fixed or movable platen. A horizontal member that is reciprocated by a hydraulic cylinder is attached to a clamp body that is guided vertically movably between the clamp bodies, and a frame that is rotatably supported by a support pin fixed to the clamp body and whose tip engages with the horizontal member. Installing a guide roller that supports the end of the mold mounting plate,
An injection molding device in which the support pin is attached at an angle with respect to the guide roller.