JPH08197578A - Method and apparatus for molding composite molded product - Google Patents

Abstract

PURPOSE: To obtain a composite molded product having good appearance, easy in the enhancement of a grade and high in productivity by holding a primary molded product after primary molding to a movable mold to perfectly close a PL surface to perform secondary molding and demolding a secondary molded product from a fixed mold for secondary molding at the point of time of the completion of mold opening. CONSTITUTION: A cavity forming the appearance surface of a molded product is provided to a movable mold 4 and primary and secondary moldings are performed by fixed molds 2, 21 and the appearance surface is not detached from the movable mold 4 until the mold opening after secondary molding. Since a PL surface is opened in the mold opening after primary molding while the molded product is pressed to the movable mold 4, the molded product is certainly held to the movable mold 4. Since the secondary slide piece 9 equipped with a protruding part of the fixed mold 21 for secondary molding is engaged with the recessed part of the molded product formed by a primary slide piece 7 equipped with a protruding part in the fixed mold 2 for primary molding and the slide piece 9 is operated after the PL surface is opened, the molded product is certainly left in the fixed mold 21 and demolded in arbitrary timing by a cylinder rod 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding method and a molding apparatus for molding a composite molded article obtained by injection molding using multicolored or heterogeneous materials of synthetic resin, which has good appearance quality and remarkably improved quality characteristics. is there.

[0002]

2. Description of the Related Art Generally, as a method for obtaining an injection-molded product from a multicolored or different material for injection-molding a synthetic resin product, a conventional injection molding machine is used to form the product in the previous step manually or by a robot. An insert molding method for inserting a primary molded product into a secondary molding die is known. Further, in recent years, fixed molds for primary and secondary molding are attached to a fixed-side mounting board of a multi-material injection molding machine in which two injection units are provided in parallel or at a certain angle in one injection molding machine. After mounting at least one movable mold on the movable side mounting plate and injection-molding the primary molded product with any one set of fixed and movable molds, the fixed mold or the movable side mold or the mounting plate for them. There is known a method of rotating or moving to combine with the other mold to perform secondary molding (see, for example, Japanese Utility Model Publication No. 6-30418).

In addition, various housings formed by injection molding, which are considered to have an important quality characteristic in appearance, have a box-like shape in many cases, and an injection molding metal for forming these box-shaped molded articles. The mold is a combination of a mold having a convex portion for forming an inner surface and a mold having a concave portion for forming an outer surface. Usually, a mold having a convex portion is a movable mold and a mold having a concave portion. Is the fixed mold. This is because the box-shaped molded product takes advantage of the characteristic that it is more likely to stick to the convex mold as compared to the concave mold due to the shrinkage of the resin, and the ejection device of the molding machine used to take out a normal molded product from the mold ( This is because the molded product is left on the movable mold side when the mold is opened in order to take out the molded product using the (installed on the movable side mounting board).

[0004]

In the conventional insert molding method, at the stage of inserting the primary molded product into the secondary molding die, the primary molded product is out of consideration due to shrinkage / deformation of the molded product and mold accuracy. The outer surface was apt to be scratched, the mold adjustment was difficult, and the productivity in the molding process was low.
Also, when using a multi-material injection molding machine,
As shown in FIG. 4, the inner surface (recess) b of the primary molded product a moves to the secondary molding side d without being disengaged from the movable mold c, so that scratches on the inner surface side do not occur. Scratches that occurred on the outer surface (projection) with a high required level occurred at the same frequency as in the case of insert molding, and productivity was low. Furthermore, in both cases of insert molding method and multi-material injection molding method, if there are many restrictions on the shape of the molded product, in order to make the gate marks of the primary and secondary molded products inconspicuous,
Side gates or submarine gates If a gate is provided on the outer side edge (near the parting surface) or the back (recess side) of the molded product using a submarine gate that uses a discarding boss, etc. However, it was necessary to post-process these gates and discarding bosses. In addition, contrary to the conventional method, the concave part of the molded product is provided in the fixed mold, the convex part is provided in the movable mold, and the gate is installed on the back surface of the molded product by a method such as a pin gate. Although it seems that it is implemented, it becomes unstable whether the molded product remains on the fixed mold side or the movable mold side during mold opening, making it difficult to take out the product and sticking out the product on the movable side. Since it is installed on the (projected part of the molded product), it leaves a pin mark protruding on the external part of the product, which is not suitable as a method for molding external parts. Further, as shown in FIG. 25, a tab (non-product portion) f is provided in a place other than the product portion e, and an undercut that is reverse tapered with respect to the releasing direction of the product is provided on the tab f. Although there is also a method of ensuring the movement of the molded product to the movable mold c and further projecting the tab f to project the product from the movable mold, although the occurrence of scratches on the appearance of the molded product is reduced, Since it is necessary to cut the tab f after the molding, there has been a problem that productivity has not been greatly improved. The present invention is intended to eliminate these conventional drawbacks, has a good appearance without scratches on the product, is easy to improve the quality, and is a highly productive composite molded product requiring no post-treatment after molding. It is an object of the present invention to provide an effective molding method and an apparatus therefor that can be obtained.

[0005]

SUMMARY OF THE INVENTION According to the present invention, multicolored or heterogeneous materials are separately injected into primary and secondary cavities formed in a movable mold that is installed oppositely to a fixed mold so as to be freely contactable and separable. A method of molding a composite product, which comprises molding a primary molded product using a slide piece having a convex portion on the outer peripheral surface on the primary molding fixed mold side, and parting the mold opening during the primary molding of the slide piece. Before opening the surface, it moves to a position that does not interfere with the release of the primary molded product, holds the primary molded product in the cavity of the movable mold in conjunction with the mold opening after the primary molding in the cavity, and When the movable mold that holds the molded product moves and closes the fixed mold for secondary molding, after the parting surface is completely closed, the convex portion on the outer peripheral surface of the fixed mold for secondary molding Secondary molding is performed by engaging the secondary slide piece equipped with When the mold is opened after shaping, the parting surface opens, and it is attached to the fixed mold for secondary molding in the recess of the primary molded product, and the secondary slide piece is activated from the time when the outer surface of the molded product separates from the movable mold. Start to move to a position that does not hinder the release of the molded product, and at the time of completion of mold opening, release the composite molded product from the fixed mold for secondary molding by the projecting means to efficiently produce the composite molded product. Is something that can be done.

That is, in order to perform composite molding with a multi-material injection molding machine, a plurality of fixed molds are mounted side by side on a mounting machine fixed side mounting board, and the fixed side mold is mounted on the molding machine movable side mounting board. At least one movable mold capable of forming a cavity (molding space) in combination is mounted, and 360 is mounted on the movable mold or the molding machine movable side mounting plate or the movable side mounting plate.
In the method of injection molding a multi-color or multi-material composite molded product by moving and rotating a rotating plate that is rotatably mounted, the fixed mold side of the primary molded product (inside the concave surface of the molded product)
In the mold opening during the primary molding, a slide piece having a concave portion formed in the mold opening / closing direction and having a convex portion for forming the concave portion is formed on the dividing surface of the movable mold and the fixed mold ( Before the parting surface or PL surface) is opened, the product is moved to a position that does not hinder the release of the product, and the PL surface is opened by the mold opening after the primary molding. Providing a protruding pin or protruding plate that uses spring force, etc., to securely hold it in the cavity of the movable mold is provided on the primary side fixed mold with a part of the molded product in contact with it, and is fixed for secondary molding. The mold is provided with a slide piece having a convex portion that engages with the concave portion on the inner surface of the primary molded product, and the movable mold holding the primary molded product moves to start the fixed mold for secondary molding and remolding. Then, after the PL surface is completely closed, the slide piece is When the mold is closed by engaging with the concave portion and further after the secondary molding, the PL surface is opened first, and the concave portion of the primary molded product ensures that the molded product is a fixed mold. Hold it, the slide piece of the fixed mold starts operating from the time when the external appearance of the product completely comes out of the movable mold, and moves to a position where there is no hindrance to mold release.
At the time of completion of mold opening, an actuator such as a hydraulic cylinder provided in the secondary molding fixed mold operates the projecting pin or stripper plate in the secondary molding fixed mold to release the composite molded product from the mold. As a result, it is possible to obtain a highly productive composite molded article having a good appearance with no scratches, and requiring no post-treatment after molding.

[0007]

[Function] Performing primary molding and secondary molding with a fixed mold with the cavity forming the external surface of the molded product as the movable mold side, and removing the external surface from the mold until the mold is opened after the secondary molding. Since it does not exist, it is possible to completely prevent scratches that tend to occur when inserting into the mold, and when opening the mold after primary molding, the PL surface is opened while pressing the molded product against the movable mold side, so molding is performed reliably. The product can be held on the movable mold side, a stable process can be obtained and scratches can be prevented.
In addition, the secondary slide piece having the convex portion is engaged with the concave portion of the molded product formed by the primary side slide piece having the convex portion in the primary molding fixed die as well. ,
Since the slide piece is operated after the PL surface is opened, the molded product can be surely left in the fixed mold, and the molded product can be kept at an arbitrary timing by an actuator such as a hydraulic cylinder installed in the fixed mold. Since the mold can be released from the mold, no pin marks or scratches due to defective release will be generated on the external appearance of the molded product. Furthermore, since both primary and secondary molding gates are provided directly on the back surface of the molded product, such as pin gates, there are no traces of the gate on the exterior of the product, and there is no need to post-process the gate for a good appearance. A quality composite molded product is obtained, and stable molding that does not require a post-treatment step is possible.

[0008]

Embodiments of the present invention will be described with reference to FIGS. 1 to 11 of a core rotary molding machine of a standard injection molding machine for composite molding, which is a box-shaped molded composite product made of two kinds of materials. , Fixed molds 2 and 2 for the primary and secondary molding provided on the fixed side mounting board 1
₁ and a movable mold 4 provided on the movable side mounting board 3 are opposed to the parting surfaces PL of both molds to form a cavity in the movable mold 4, and a multicolor or heterogeneous material is primarily formed in the cavity. And a secondary injection method for injecting from the primary injection cylinder 5 and the secondary injection cylinder 6 to mold a composite product, the primary molding having a convex portion 7 ₁ on the outer peripheral surface of the primary molding fixed mold side. The side slide piece 7 is used to form a primary molded product, and the slide piece 7 is removed from the locking block 8 before opening the parting surface PL of the shape opening at the time of primary molding so that the slide piece 7 does not interfere with mold release. And the primary mold 10 is held in the cavity of the movable mold 4 in conjunction with the opening of the mold after the primary molding in the cavity, and the movable mold 4 holding the primary mold 10 moves. when closing the mold the secondary molding stationary die 2 _1, Pate After the ring plane PL is completely closed,
The secondary side slide piece 9 provided with the convex portion 9 ₁ on the fixed mold for secondary molding 2 ₁ is engaged with the concave portion of the primary molded product 10 to carry out secondary molding. The opening surface opens and is attached to the fixed mold in the recess of the primary molded product, and the secondary side slide piece 9 is activated from the time when the outer surface of the molded product separates from the movable mold 4, thereby hindering the mold release. without moving to the position, it is a composite molded article 11 from the secondary molding stationary die 2 ₁ mold opening completion so that the release at the projecting means of the stripper plate 12.

A mounting plate 1 is mounted on the fixed side mounting board of the injection molding machine.
Through ₁ and runner stripper 1 _2, a plurality of the stationary mold 2, the rotary plate at least one of the movable mold 4 capable of forming a cavity in combination with the fixed mold 2 on the movable side mounting plate 3 It is provided via 3 ₂ and the movable side mounting plate 3 ₁ and is opposed to the parting surface PL, and the fixed mold and the movable mold are combined on the PL surface by the mold opening / closing operation of the molding machine. . In addition, the cavity (mold concave part) forming the appearance side (convex side) of the box-shaped molded product is the movable mold 4, and the core forming the inner surface (mold convex side) is the fixed mold 2.
The injection unit including the gate and the spool runners 5 ₁ and 6 ₁ which are formed in 2 ₁ , but which can inject a multicolored or heterogeneous material into the cavity separately into the primary injection cylinder and the secondary injection cylinder A primary-side slide piece 7 is provided slidably in communication with the cylinder 6 and provided in the fixed mold 2 and provided with a convex portion 7 ₁ for forming a concave portion on the fixed mold side of the primary molded product 10 on the outer peripheral surface. Contacting the locking block 8 and holding the primary molded product 10 in the cavity of the movable mold 4 in conjunction with the mold opening of the parting surface PL after the primary molding, and at the concave portion of the inner surface of the primary molded product. the secondary slide piece 9 with the projecting portion 9 ₁ on the outer peripheral surface engaging slidably deploy the secondary molding stationary die 2 _1, and, when mold opening after secondary forming, secondary projecting pin for releasing a molded composite article 11 from the molding stationary die 2 ₁ Or the stripper plate 12 such as ejector plate as a composite molded article molding apparatus equipped slidably coupled to the secondary molding stationary die 2 ₁ to the drive unit 14 through the cylinder rod 13.

The fixed mold 2 for primary molding is provided with an auxiliary projecting plate 15 slidably facing the PL surface so that it can be projected and retracted by a spring 16 and the primary molded product of the movable mold 4 is opened when the mold is opened. The primary side slide piece 7 which is surely moved and held in the cavity and which forms a concave portion on the inner surface of the molded product is slidably fitted to the fixed mold 2, and a spring 17 contacts the locking block 8. It is considered that the locking block 8 can be operated so that the slide piece 7 provided with the recess can be released from the recess when the mold is opened. The secondary slide piece 9 provided on the secondary molding fixed die 2 ₁ can also be brought into contact with the locking block 18 for operating the slide piece 9 by the spring 19. Further, after the mold opening is completed, the fixed mold 2 for secondary molding is formed.
Stripper plate 12 for releasing the product held in ₁ and cylinder rod 1 for operating this
3 and a hydraulic cylinder drive device 14 for operating the cylinder rod 13. The movable mold 4,4 is mounted to the rotating plate 3 ₂ of the molding machine, the axis center of the molding machine mounting platen 3 in the mold opening completion position 36
It can rotate 0 degree (or 180 degrees), rotates 180 degrees for each shot, and is alternately combined with the other fixed mold. As shown in FIGS. 1 and 2, a parting lock mechanism 2 such as a cam type or a magnet type for controlling the opening and closing of the mold for both the primary and secondary molding dies.
0, a stop bolt 23, a spring 22, a mold opening / closing control mechanism 21, and other equipment such as guide pins 23 ₁ necessary for a general injection molding mold device are arranged.

As shown in FIG. 3, a cavity for primary molding formed by a fixed mold 2 for primary molding and a movable mold 4, a fixed mold 2 ₁ for secondary molding, a movable mold 4 and The molten resin injected from the primary and secondary injection cylinders 5 and 6 is filled into the cavity spaces for secondary molding formed by the primary molded product 11 held in the movable mold through the sprue and runner, and cooled. To be done. Then, the mold opening is started after the injection and cooling steps are finished as shown in FIG. 4 to FIG. 7 for explaining the steps from the mold opening start to the completion. First, as shown in FIG. 4, the primary molding side is shown in FIG. Due to the function of the magnet type parting lock, the runner stripper 1 ₂ and the fixed mold 2 on the fixed mold 2 side open before the PL surface opens. With a gate which is provided with a pin gate to the back surface of the molded product is cut by hand, the locking block 8 fixed to the stationary side mounting plate 1 ₁ is withdrawn from the fixed mold 2, the slide piece 7 is spring 17 with it Move to the inside of the molded product. By this operation, the concavo-convex portion is released, and the obstacle in the direction in which the molded product comes out of the fixed mold 2 disappears.

On the secondary molding side, unlike the primary molding side, the PL surface of the mold is first opened by the action of the first mold opening / closing control mechanism 21 shown in FIG. However, at this time, the secondary side fixed mold 2 is placed in the recess provided in the primary molded product.
For ₁ sliding frame 9 remains engaged, the product is released smoothly from the movable mold 4 in a state of being securely held in the fixed mold 2 ₁ strong secondary side of mold release resistance . If then mold opening proceeds, the primary molding side as shown in FIG. 5, the runner stripper 1 ₂ is operated by the action of the stop bolts (not shown), the sprue runner 5 ₁ is released from the injection cylinder nozzle After that, the fixed mold 2 stops and PL
The surface begins to open. At this time, the auxiliary projecting plate 15 makes the spring 1
6 acts to release the primary molded product from the fixed mold 2 following the opening of the PL surface, and the mold is opened while the primary molded product is reliably moved and held on the movable mold 4 side. move on. On the secondary molding side, the PL surface has finished opening, and the cam of the second mold opening / closing control mechanism 21 ₁ engages with the lock pin, whereby the fixed mold 2 is pulled in the mold opening direction, and the first mold opening / closing mechanism. When the engagement of 21 is disengaged, the fixed mold 2 further starts moving in the mold opening direction, and the space between the fixed mold 2 ₁ and the runner stripper 1 ₂ opens. With a gate which is provided with a pin gate to the back surface of the molded product is cut by hand, the fixed-side mounting plate 1 ₁ locking block 18 which is fixed to is withdrawn from the fixed mold 2 _1, a slide piece 9 with it spring 19 moves inward of the molded product. Uneven portion is released by this operation, so that the obstacle which eliminates for exit direction from the fixed die 2 ₁ of the molded article. Furthermore mold opening proceeds, mold opening is completed at the time of the even operated runner stripper 1 ₃ of the secondary molding side as shown in FIG. When the hydraulic cylinder 14 operates and the cylinder rod 13 moves forward after the mold opening is completed, the stripper plate 12 is pushed out by the inclined surface provided on the cylinder rod 13,
The product of the composite molded product 11 is released from the secondary side fixed mold 4 [FIG. 7].

Further, after the product sprue runner is taken out, the mold is closed again for molding in the next process, as shown in FIG. Retreat in the mold and return to the initial position. At this time, the stripper plate 12 is also operated by a spring or a return pin (not shown).
It is designed to return to the position before the ejecting operation. Subsequently, the rotating plate 3 ₂ rotates 180 degrees, the movable mold 4 is rotated move to possible position combinations each with the other of the stationary mold 2. At this time, the primary molded product moves to the secondary molding side while being held in one movable mold. Next, as shown in FIG. 9, when the mold clamping is started, the PL surface is closed first on both the primary and secondary sides. At this time, on the primary side, the PL surface of the movable mold plate 4 comes into contact with the auxiliary projecting plate 15 of the fixed mold 2, and the spring 16 is pushed back. On the secondary side, the primary molded product 10 held on the movable side is inserted into the core of the fixed mold 2, but the slide piece 7 remains moved to a position where it does not hinder the release and insertion of the product. Also, unlike insert molding, since the elapsed time after molding of the primary molded product is extremely short (usually within 10 seconds), the dimensional change due to shrinkage or the like is small, and therefore the occurrence of scratches and damages on the inner surface of the primary molded product is small. When the mold closing further proceeds, as shown in FIG. 10, after the PL surface is completely closed, the locking blocks 8 and 18 on both the primary side and the secondary side are fixed to the fixed mold 2, respectively.
The slide pieces 7 and 9 are inserted into 2 ₁ and moved to predetermined positions. As described above, on the secondary side, the PL surface is closed, and the slide piece 9 moves after engaging the primary molded product 10 at a predetermined position and engages with the uneven portion, so that a flaw is generated on the inner surface of the molded product. There is no such thing. As shown in FIG. 11, when the mold is completely closed, the movable mold 4 and the fixed mold 2 form a primary molding space on the primary molding side, and the movable mold 4 and the fixed mold 2 are formed on the secondary side. A space for secondary molding is formed by ₁ and the primary molded product 10, and the process proceeds to the next molding cycle. In this way, it is possible to reliably move and hold the molded product in the mold by operating the mold, and to obtain a product of good quality with no scratches, gates, or protrusion marks left on the appearance side of the molded product. Becomes As a result of actually molding a composite molded article using the mold using an acrylonitrile-styrene-butadiene copolymer resin (ABS resin) and a transparent polycarbonate resin (PC resin), a product having very excellent appearance characteristics. Was able to produce efficiently.

In this embodiment, the core rotating type dissimilar material injection molding machine is used, but other compound injection molding machines such as a movable mold slide type molding machine may be used. The primary and secondary molding materials may be the same material with different colors or completely different materials (for example, a combination of a thermoplastic hard resin and a thermoplastic elastomer or a combination of a thermoplastic resin and a thermosetting resin). Further, in the present embodiment, the auxiliary protrusion of the primary molded product is a spring-operated protrusion plate,
A stripper plate that operates with a hydraulic cylinder was used to project the secondary molding (product), but both were linked with other mechanical actuators (for example, air cylinders or a combination of a ball screw and a motor), and mold opening and closing. A mechanism such as a spring, urethane rubber or a cam may be used. In order to perform the mold opening / closing control described above, control using a complicated actuator may be performed, but a mold control device such as a magnet type parting lock or a parting lock set as shown in FIG. It is preferable to use a combination of similar mechanical devices and springs having different spring forces.

The examples of FIGS. 12 to 15 show the mold opening / closing control method on the primary molding side described above, in which the mold is clamped [FIG. 12].
From the mold opening start by the parting lock mechanism 20
While L plane was closed with the aid of the stationary mold 2 and the runner stripper 1 ₂ springs 22, out opening is guided by the stop bolt 23 and the support pin 23 ₁ [13], the stop bolt 23 is activated runner stripper 1 ₂ is operated Te [FIG 14]. Next, the mold opening on the fixed mold 2 side is stopped after the runner stripper operation, and when the mold opening further proceeds, the parting lock 20 is released and the PL surface opens (FIG. 15). Parting lock mechanism 2 during this mold clamping
The PL surface is closed first by the force of the magnet of 0 and the resistance of the spring 22.

Examples of FIGS. 16 to 19 and FIGS. 20 to 2
The example of 3 is another example of the device for controlling the opening / closing operation of the mold,
The is also used in the secondary molding side of the composite molded article molding apparatus, a fixed die provided in the stationary side mounting plate 1 ₁ of the injection molding machine 2
And a movable mold 4 capable of forming a cavity in combination with the fixed mold 2 are provided on the movable side mounting plate 3 ₁ so as to face the parting surface PL, and a synthetic resin material can be injected into the cavity. It is a mold opening / closing control device which is also used in a molded product molding device in which an injection part including a spool runner is provided in a fixed mold 2.

In the examples of FIGS. 16 to 19, the mold opening / closing control mechanism 21 is arranged so that the lock pin 26 is disengaged from the lock bar 24 by the spring 25, and the stop bolt 23 having the spring 22 and the support pin. 23 ₁ Corresponding to the mold opening of the movable mold 4 guided on the fixed side mounting plate 1
_A lock bar 24 is provided on each of ₁ and the movable side mounting plate 3 _1, and a pair of first and second mold opening / closing control mechanisms 21, 21 ₁ are arranged. And in the mold clamped state, one of the first
The mold opening / closing control mechanism 21 is in the locked state, and the other second
The mold opening / closing control mechanism 21 ₁ is detached [Fig. 16]. Next, after opening the mold and opening the PL surface, the second mold opening / closing mechanism 21 ₁ is locked [FIG. 17]. Further, as the mold opening progresses, the second mold opening / closing control mechanism 21 ₁ has a stronger locking force than the first mold opening / closing control mechanism 21. type 2 starts to move on the stop bolt 23 and the support pin 23 ₁ by the spring 22, the runner stripper 1 ₂ has a immobile frictional resistance PL lock 27 [Figure 18]. Further, when the stop bolt 23 is activated, the runner stripper 1 ₂ is operated, the second die opening and closing control mechanism 21 ₁ of the lock is disengaged Mold Opening [19]. Further, at the time of mold clamping, the difference between the resistance of the spring 22 and the PL lock 27, the shapes of the first and second mold opening / closing control mechanisms 21, 21 ₁ , that is, the tip of the lock bar 24 of the second mold control mechanism 21 _1. The angle and width or the angle of the lock pin 26 in the lock bar 24 fitting direction is changed from the tip angle and width of the lock bar 24 of the first mold opening / closing mechanism 21 or the angle of the lock pin 26 in the fitting direction of the lock bar 24. By increasing the insertion resistance of the first mold opening / closing mechanism 21, the PL surface is closed first.

In this case, in the example of FIGS. 20 to 23, first, the parting surface P of the fixed mold 2 and the movable mold 4 is used.
In order to separate L, the lock pin 26 is engaged with the lock pin 26 urged by the spring 25 that maintains the joint between the fixed mold 2, the runner stripper 1 ₂ and the fixed side mounting plate 1 ₁ . A first mold opening and closing mechanism 21 comprising a lock bar 24 that is provided on the fixed side mounting plate 1 _1, provided in the movable side mounting plate 3 _1, a hook-shaped cam bars 28 of cam operation of moving the mold opening A second mold opening / closing mechanism 31, which is provided on the fixed mold 2 side and includes a pinned cam lock 29 that is engaged with and disengaged from the cam bar 28, and a lock bar 30 that abuts on the cam lock 29, is used as a fixed mold. This is a mold opening / closing control device provided corresponding to the mold 2 and the movable mold 4.
The fixed mold 2 and the movable mold 4 are the spring 2 as in the previous example.
It is installed oppositely so that the mold can be opened and closed by being guided by a stop bolt 23 and a support pin 23 ₁ having a PL lock 27, and a PL lock 27 is provided between the runner stripper 1 ₂ and the fixed mold 2. There is.

In this embodiment, in the mold clamping state, the first mold opening / closing control mechanism 21 is in the locked state, and the second mold opening / closing control mechanism 31 has some play until the hook is hooked. Stroke to open to [Fig. 20]. Then, when the PL surface is opened by the stroke described above after starting the mold opening, the second mold opening / closing control mechanism 31 is in a locked state, that is, the cam lock 29 is hooked on the hook of the cam bar 28 and the fixed mold 2 is held. Start pulling [Fig. 21]. Next, when the mold opening progresses, the second mold is opened from the first mold opening / closing control mechanism 21.
Since the mold opening / closing control mechanism 31 has a stronger locking force,
The lock of the mold opening / closing control mechanism 21 is released, and the fixed mold 2 moves from the spring 22 to the stop bolt 23 and the support pin 23 _1.
Start moving the upper [22], the lock bar 30 of the second mold closing control mechanism 31 at the same time runner stripper 1 ₂ is operated by a stop bolt 23 further mold opening progresses
Comes off, and the cam lock 29 becomes free. As the mold opening progresses further, the cam lock 29 of the second mold opening / closing control mechanism 31
The PL surface is further opened by releasing from the cam bar 28 and releasing the lock [FIG. 23]. In this case, at the time of mold clamping, in the second mold opening / closing control mechanism 31, the cam lock 29 is in a state where it does not interfere with the insertion of the cam bar 28, and there is almost no resistance to the mold clamping in the direction. In the 1 mold opening / closing control mechanism 21, the fixed mold 2 is provided by the resistance of the lock pin 26 biased by the spring 25, the resistance of the tip of the cam bar 24, the resistance of the spring 22 and the PL lock 27.
First PL surface is closed because it is then difficult moved to the stationary side mounting plate 1 ₁ direction, in which it is accurately mold opening and closing operation.

[0020]

INDUSTRIAL APPLICABILITY The present invention uses a slide piece having a convex portion on the outer peripheral surface on the side of the primary molding fixed die, and performs the primary molding before opening the parting surface of the mold opening at the time of the primary molding. Moves to a position that does not interfere with product release, holds the primary molded product in the cavity of the movable mold in conjunction with the mold opening after the primary molding in the cavity, and the movable metal holding the primary molded product. When the mold moves and the mold is closed with the fixed mold for secondary molding, after the parting surface is completely closed, the secondary slide with the convex portion on the outer peripheral surface of the fixed mold for secondary molding. Secondary molding is performed by engaging the piece in the recess of the primary molded product, and the parting surface is opened in the mold opening after the secondary molding, and is attached to the fixed mold for secondary molding in the recess of the primary molded product, When the outer surface of the molded product separates from the movable mold, the secondary slide piece is activated to release the molded product. After moving to a position where there is no hindrance and releasing the composite molded product from the fixed mold for secondary molding by the projecting means when the mold opening is completed, the appearance of the primary molded product (secondary molded product) Since the convex side is not removed from the mold until the final product removal stage, it is possible to completely prevent scratches due to rubbing with the mold, and the fixed mold side is the back surface of the product (non-appearance side). Since the gate can be provided arbitrarily, post-treatment etc. is not necessary, and the shape of the primary molded product is obtained because the auxiliary ejection of the product release assist is performed from the fixed side when the mold on the primary molding side is opened. Regardless of which, the product can be reliably held on the movable side, and since the product protrusion on the secondary side is performed from the fixed side (non-external side), there are no scratches or marks on the external surface, and tabs, etc. It is necessary to provide a non-product part of In addition, a post-treatment is unnecessary, a product appearance is good, and a composite molded product with stable productivity can be obtained. In addition, according to the present invention, when the mold is opened and closed, a fixed mold and a movable mold are combined. A first mold opening / closing mechanism including a lock pin that controls separation, joining, and order of parting surfaces, and a lock bar that engages the lock pin;
A cam bar for cam operation, which also includes a lock pin and a lock bar that engages with the lock pin, or that moves by opening the mold, and a cam lock that is disengaged from the cam bar.
A lock bar which is engaged with and disengaged from the cam lock, has a locking force stronger than the mold locking force with respect to the mold opening of the first mold opening / closing mechanism, and the lock bar or cam bar fitting resistance during mold clamping. Since the second mold opening / closing mechanism with a small size can be installed, the mold opening / closing sequence can be automatically controlled with a simple mechanism, so that the molds can be operated safely and reliably and the productivity is greatly enhanced. It is possible to improve, and it is possible to efficiently produce a molded product having a good appearance quality without post-treatment after molding.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

2 is a side view of the example of FIG. 1. FIG.

FIG. 3 is a vertical cross-sectional view taken along the line AA of FIG.

4 is a vertical sectional view showing a mold opening operation state of the example of FIG.
The 1st process of mold opening is shown.

FIG. 5 is a second process drawing of the mold opening of the example of FIG.

6 is a vertical cross-sectional view showing a third step of mold opening in the example of FIG.

FIG. 7 is a vertical cross-sectional view showing completion of mold opening and a product taking-out step in the example of FIG.

8 is a vertical cross-sectional view showing a mold closing operation state of the example of FIG.
The 1st process of mold closing is shown.

9 is a vertical cross-sectional view showing a second mold closing step of the example of FIG.

10 is a vertical cross-sectional view showing a third mold closing step of the example in FIG.

11 is a vertical cross-sectional view showing the mold clamping process of the example of FIG.

12 is a side view showing a mold opening operation state at the time of primary molding in the example of FIG. 2, showing a mold clamping state.

13 is a side view showing the mold opening start state of the example of FIG. 2. FIG.

FIG. 14 is a side view showing the mold opening second step state of the example of FIG. 2;

FIG. 15 is a side view showing the mold opening completion state of the example of FIG. 2;

16 is a side view showing a mold opening operation state at the time of secondary molding in the example of FIG. 2, showing a mold clamping state.

17 is a side view showing the mold opening start state of the example of FIG. 2. FIG.

FIG. 18 is a side view showing the mold opening second step state of the example of FIG. 2;

FIG. 19 is a side view showing the mold opening completion state of the example of FIG. 2;

FIG. 20 is a side view showing another embodiment of the mold opening / closing control device used in the present invention, showing a mold clamping state.

21 is a side view showing the mold opening start state of the example of FIG. 20. FIG.

22 is a side view showing the mold opening second step state in the example of FIG. 20. FIG.

23 is a side view showing the mold opening completion state of the example of FIG. 20. FIG.

FIG. 24 is a vertical cross-sectional view showing an operating state of a conventional example.

FIG. 25 is a vertical sectional view showing an operating state of another example of the conventional example.

[Explanation of symbols]

1 Fixed side mounting plate 1 ₁ Mounting plate 2 Fixed mold 2 ₁ Fixed mold for secondary molding 3 Movable side mounting plate 3 ₁ Mounting plate 4 Movable mold 5 Primary injection cylinder 6 Secondary injection cylinder 7 Primary slide piece 7 ₁ , 9 ₁ Projection 8, 18 Locking block 9 Secondary slide piece 10 Primary molded product 11 Composite molded product 12 Stripper plate 13 Cylinder rod 14 Drive device 15 Auxiliary projecting plate 16, 17, 19 Spring 20 Parting lock 21 No. 1 Mold open / close control mechanism 21 ₁ 2nd mold open / close control mechanism 22 Spring 23 Stop bolt 23 ₁ Support pin 24 Lock bar 25 Spring 26 Lock pin 27 PL lock 28 Cam bar 29 Cam lock 30 Lock bar 31 Second mold open / close control mechanism

Claims (3)

[Claims] 1. A method of molding a composite product by injecting a multicolored or heterogeneous material into primary and secondary cavities into a cavity formed in a movable mold that is installed opposite to a fixed mold so as to be freely separated from and into the cavity. Therefore, a primary molded product is molded using a slide piece having a convex portion on the outer peripheral surface of the primary molding fixed mold side, and the primary molding is performed before opening the parting surface of the mold opening during the primary molding of the slide piece. Moves to a position that does not interfere with product release, holds the primary molded product in the cavity of the movable mold in conjunction with the mold opening after the primary molding in the cavity, and the movable metal holding the primary molded product. When the mold moves and the mold is closed with the fixed mold for secondary molding, after the parting surface is completely closed, the secondary slide with the convex portion on the outer peripheral surface of the fixed mold for secondary molding. The piece is engaged in the recess of the primary molded product to perform the secondary molding, and the mold is opened when the mold is opened after the secondary molding. The molding surface is opened, and it is attached to the fixed mold for secondary molding in the concave part of the primary molded product, and the secondary slide piece is started to operate when the outer surface of the molded product separates from the movable mold, and the molded product is released from the mold. A method for molding a composite molded article, characterized in that the composite molded article is released from a fixed mold for secondary molding by a projecting means when the mold opening is completed. 2. A plurality of fixed molds provided on a fixed mounting plate of an injection molding machine, and a movable mold capable of forming a cavity by a combination of the fixed molds are provided on the movable side mounting plate and a parting surface. , The injection part including the gate and the sprue runner capable of injecting multicolored or heterogeneous materials into the cavity in the primary and secondary is provided in the fixed mold, and the convex part is formed on the outer peripheral surface on the fixed mold side for the primary molding. A slide piece provided with is slidably abutted against the locking block, and a secondary slide piece having a convex portion that engages with a concave portion on the inner surface of the primary molded product is separated from the fixed mold for primary molding. It is slidably mounted on a fixed mold for secondary molding at a fixed position, and a protruding pin or protruding plate that separates the molded product from the fixed mold for secondary molding is connected to the drive device for secondary molding. A compound mold characterized by being mounted slidably on a fixed mold. Compound molding equipment. 3. A fixed mold provided on a fixed side mounting plate of an injection molding machine, and a movable mold capable of forming a cavity by a combination of the fixed mold and the movable side mounting plate, and facing each other on a parting surface. The mold is provided with an injection unit including a gate and a sprue runner capable of injecting a synthetic resin material into the cavity, and the parting surfaces of the fixed mold and the movable mold are separated and joined when the mold is opened and closed. A first lock pin for controlling the sequence and a lock bar for engaging the lock pin
A mold opening / closing mechanism, a cam bar for operating a cam, which also comprises a lock pin and a lock bar for engaging the lock pin, or which moves by opening the mold, a cam lock engaged with and disengaged from the cam bar, and a disengageable engagement with the cam lock. A second metal having a locking force stronger than the mold locking force for the mold opening of the first mold opening / closing mechanism and having a small insertion resistance of the lock bar or the cam bar during mold clamping. A mold opening / closing control device in a molded product molding apparatus, which is provided with a mold opening / closing mechanism.