JP2000280296A - Mold device for molding two materials - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a whole mold device compact, to secure high precision even in the case of a multi-cavity mold, and to facilitate maintenance in a two-color molding mold device for molding a two-color molded product having a difference in level. SOLUTION: A movable mold 32 has first and second movable cores 61, 66 having different strokes (c) (f) which close a secondary product cavity 33b during primary molding. A core holder 52 driven by a hydraulic cylinder 54 is fitted to the movable mold 32, and the first movable core 61 is fixed to the core holder 52, the second movable core 66 is supported by the core holder 52 to be able to move in a prescribed range, and a fixed mold 31 is biased to the opposite side by a spring 76. A fitting surface 78 for fitting the second movable core 66 against the bias of the spring 76 is formed in the movable mold 32. When the core holder 52 is moved, its pushing surface 74 pushes the second movable core 66 so that the movable core 66 is moved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-material molding die apparatus used for two-color injection molding of a thermoplastic resin.

[0002]

FIG. 5 shows an example of a two-color molded article (product 1) of a thermoplastic resin. In the figure, a portion with a horizontal hatching indicated by a broken line is a transparent portion 2 made of a transparent resin, and the other portion is an opaque portion 3 made of an opaque resin. The illustrated product 1 is:
The transparent portion 2 has a thick portion 2a and a thin portion 2b.

Here, an example of a mold apparatus for molding the product 1 will be described with reference to FIGS. 11 is a fixed type and 12 is a movable type.
Are moved in the vertical direction in the figure (the mold opening and closing direction) to open and close, and when the mold is closed, a product cavity 13 having the shape of the product 1 is formed therebetween. At the time of molding, the opaque portion 3 is first molded (primary molding), and then the transparent portion 4 is molded (secondary molding). A first movable core 14 and a second movable core 15 which are bodies are provided on the movable mold 12 side. These movable cores 14 and 15 are
In the mold opening and closing direction. The movable die 12 is provided with a first core holder 16 which moves in a predetermined range in the die opening / closing direction.
The first movable core 14 is fixed to the core holder 16. The first core holder 16 moves a fixed stroke a (for example, 2 mm) by driving the hydraulic cylinder 17. On the opposite side of the fixed die 11 of the first core holder 16, there is provided a second core holder 18 which moves in a predetermined range in the die opening and closing direction. Of the movable core 15 is fixed. Further, an interlocking pin 19 is fixed to the first core holder 16, and a flange portion 20 is provided at an end of the interlocking pin 19 opposite to the fixed die 1. And interlocking pin 19
Is slidably inserted into a hole 21 formed in the second core holder 18.
The flange portion 20 is located at a counterbore portion 22 formed at a portion on the opposite side of the flange portion. A predetermined gap b (for example, 0.6 mm) is generated between the flange portion 20 and the bottom surface of the counterbore portion 22 in a state where the movable cores 14 and 15 are maximally separated from the fixed mold 11. On the other hand, in this state, both core holders 16,1
8 hit each other.

When the first core holder 16 is moved toward the fixed mold 11 by driving the hydraulic cylinder 17 from a state in which the movable cores 14 and 15 are maximally separated from the fixed mold 11 as described above,
The first movable core 14 is integrally formed with the first core holder 16.
Moves, and the first movable core 14 finally strikes the fixed mold 11. When the first core holder 16 moves to the fixed mold 11 side by the distance b, the flange portion 20 of the interlocking pin 19 fixed to the first core holder 16 becomes the counterbore portion of the second core holder 18. It hits the bottom of 22 and after that,
The second core holder 18 is integrated with the first core holder 16.
And the second movable core 15 moves toward the fixed mold 11. The second movable core 15 includes a first core holder 16 and a second
Stroke ab obtained by subtracting the gap b between the bottom surface of the flange portion 20 and the counterbore portion 22 from the stroke a of the movable core 14 of FIG.
It moves and finally strikes the fixed mold 11.

In molding, the fixed mold 11 and the movable mold 12 are closed, and the movable cores 14 and 15 are brought into contact with the fixed mold 11 as described above. In this state, a primary product cavity 13a is formed between the fixed mold 11, the movable mold 12, and the movable cores 14, 15. Then, from the primary gate (not shown) of the fixed mold 11 to the primary product cavity 13a,
Next resin A is filled (primary molding). After the primary resin A filled in the primary product cavity 13a is solidified, the first core holder 16 and the first movable core 14 are moved to the side opposite to the fixed mold 11 by driving the hydraulic cylinder 17, and fixed. Type
Leave 11 When the first core holder 16 moves by the distance b, the first core holder 16 abuts on the second core holder 18, and thereafter, the second core holder 16 and the second core holder 16 are integrated with each other. Core holder 18 and second
The movable core 15 moves to the side opposite to the fixed mold 11. This second
The movable core 15 moves by a stroke ab. In this state, a secondary product cavity 13b is formed between the fixed mold 11, the movable mold 12, the movable cores 14, 15 and the primary resin A filled in the primary product cavity 13a. Then, a secondary product cavity 13b is formed from a secondary gate (not shown) of the fixed die 11.
Is filled with a secondary resin B (secondary molding). Furthermore, after the secondary resin B filled in the secondary product cavity 13b is solidified, the fixed mold 11 and the movable mold 12 are opened, and the primary resin A and the secondary resin integrated in the product cavity 13 are opened. The product 1 made of B is taken out.

[0006] In this way, a product 1 comprising the opaque portion 3 made of the primary resin A and the transparent portion 2 made of the secondary resin B is formed. Then, the first movable core 14 having a different stroke
The second movable core 15 forms a thick portion 2a and a thin portion 2b in the transparent portion 2. In FIG. 5 showing the molded product 1, reference numeral 5a indicates a primary gate trace, and reference numeral 5b indicates a secondary gate trace.

However, the conventional mold apparatus uses two core holders 16 and 18 arranged in the mold opening and closing direction in order to operate the first movable core 14 and the second movable core 15 at different strokes. Therefore, there is a problem that the thickness of the entire mold apparatus becomes large. In addition, since each of the two core holders 16 and 18 is only one each, and in the case of a plurality of core holders, the movable cores 14 and 15 corresponding to each product cavity 13 are fixed to the common core holders 16 and 18, Each product cavity 1
It is difficult to adjust every three. In other words, if the core holders 16 and 18 are common, a plurality of product cavities 13
In all of the above, it is difficult to ensure high accuracy for the stroke of the movable core 15 and the like. For this reason, the configuration of the conventional mold apparatus is used up to four-pieces and not used in the case of eight-pieces or more. In addition, since the large core holders 16 and 18 must be handled, maintenance is troublesome.

An object of the present invention is to solve such a problem. In a two-material molding die device for molding a two-material molded product having a step, the entire die device is made compact, An object of the present invention is to make it possible to easily secure high precision even in the case of individual picking and also to facilitate maintenance.

[0009]

According to a first aspect of the present invention, there is provided a first mold and a second mold which are opened and closed with each other to form a product cavity therebetween when the mold is closed. And a plurality of closures are movably provided on the first mold, and these closures are abutted against a second mold to form the first mold, the second mold, and the closure. Forming a primary product cavity therebetween, and separating the closing body from the second mold body, and forming a secondary product cavity between the molding material filled in the primary product cavity, the mold body, and the closing body. Forming a two-material molding die having, as the closing body, a first closing body and a second closing body having a smaller stroke than the first closing body. A movable body for supporting the closing body substrate, and a driving source for driving the closing body substrate; The first closing body is fixed to the closing body substrate, the second closing body is movably supported in the same direction as the moving direction of the closing body substrate, and the second closing body is fixed to the closing body substrate. On the other hand, a biasing means biases the second mold body in a direction away from the second mold body, and the first mold body has a locking surface for locking the second closing body against the biasing means. And pressing the second closing body against the second closing body in a state where the second closing body is separated from the locking surface, and pressing the second closing body toward the second mold body. A surface is formed.

When the closing substrate is moved toward the second mold by driving the driving source from a state where the first closing member and the second closing member are farthest from the second mold, the closing member is closed. The first closing body also moves integrally with the body substrate, and the first closing body eventually strikes the second mold body. Also, initially,
By the urging of the urging means, the second closing body is locked by the locking surface of the first mold body, and there is a gap between the second closing body and the pressing surface of the closing body substrate. Although there is a gap, when the closing substrate moves by the gap, the pressing surface of the closing substrate moves to the second position.
Then, the second closing body moves together with the closing body substrate against the urging of the urging means. The second closure eventually strikes the second mold.

At the time of molding, the first mold and the second mold are closed, and the first and second closures are in contact with the second mold as described above. To In this state, a primary product cavity is formed between the first mold, the second mold, the first closing body, and the second closing body. In this state, the primary product cavity is filled with the primary molding material. After the primary molding material filled in the primary product cavity is solidified, the closing substrate is moved in a direction away from the second mold body by driving the driving source. Along with that, the first closing member also moves integrally with the closing member substrate,
The second closing body also moves integrally with the closing body substrate by the urging of the urging means. Finally, the second closing body is locked by the locking surface of the first mold body, but thereafter the closing body substrate and the second closing body move by a predetermined amount. In this way, the first closing body and the second closing body are separated from the second mold body, and the first closing body and the second closing body are separated from each other.
Mold, second mold, first closure, second closure and 1
Between the primary molding material solidified in the secondary product cavity
Next cavity is formed. Then, the secondary product cavity is filled with a secondary forming material.

According to a second aspect of the present invention, in the two-material molding die apparatus of the first aspect of the present invention, a plurality of product cavities are provided, and the second closing member is provided independently for each product cavity. It is.

[0013] That is, the second closures in each of the plurality of product cavities operate independently.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the two-material molding die apparatus of the present invention will be described below with reference to FIGS. In addition, the product 1 molded by the present mold apparatus is:
This is shown in FIG. 5 described above. Reference numeral 31 denotes a fixed mold as a second mold, and 32 denotes a movable mold as a first mold. These fixed mold 31 and movable mold 32 are arranged in the vertical direction (mold opening and closing direction) in FIGS. It moves and opens and closes each other, and forms a product cavity 33 therebetween when the mold is closed. The mold apparatus of the present embodiment has eight pieces, and eight product cavities 33 are formed as shown in FIG. Each product cavity 33 includes a primary product cavity 33a for molding the opaque portion 3 of the product 1, as will be described in detail later.
It is partitioned into a secondary product cavity 33b for molding the transparent part 2 of the product 1.

The fixed mold 31 is formed by joining several fixed component plates 36 arranged in the mold opening and closing direction. Only one fixed component plate 36 is shown. Also,
In the fixed mold 31, material passages 37a and 37b to which nozzles of a two-color injection molding machine are connected are formed. This material passage 37a, 3
7b, a primary material passage 37a through which a primary resin A made of an opaque thermoplastic resin as a primary molding material is passed, and a secondary resin B made of a transparent thermoplastic resin which is a secondary molding material is passed through 2b. There is a next material passage 37b. The fixed mold 31 includes a primary gate 38a opening from the primary material passage 37a to the primary product cavity 33a and a secondary gate 38b opening from the secondary material passage 37b to the secondary product cavity 33b. Is formed. Further, the surface of the fixed mold 31 where the product cavity 33 is formed, that is, the surface on the movable mold 32 side is provided with the step portion 4 of the product 1.
Are formed, and the surface forming the product cavity 33 has a first receiving surface 40 and a second receiving surface 40 which are different from each other in the mold opening / closing direction at a portion where the secondary product cavity 33b is formed. It has a surface 41.

The movable mold 32 is constructed by joining several movable mold plates 46, 47, 48 and 49 arranged in the mold opening / closing direction, although not all are illustrated. Fixed type 31
The first movable component plate 46 facing the
A fixed core 51 forming 33 is embedded and fixed.

Although there is a gap between the first movable component plate 46 and the third movable component plate 48, there is a core holder 52 as a closing body substrate in the mold opening and closing direction. It is supported movably within a predetermined range. The core holder 52 abuts on the third movable component plate 48 in a state where the core holder 52 is moved to the opposite side to the fixed mold 31, and in a state where the core holder 52 is moved to the most fixed mold 31 side,
A stopper 53 detachably fixed to the surface on the fixed mold 31 side abuts the first movable mold plate 46. The stroke c of the core holder 52 during that time is 0.83 mm. The core holder 52 is moved by driving a hydraulic cylinder 54 as a drive source provided on the third movable component plate 48. Here, this driving will be described. The hydraulic cylinder 54 has a piston rod 55 that moves a predetermined stroke in the mold opening and closing direction. The piston rod 55 is provided with a pair of flanges 56 and 57 arranged in the mold opening and closing direction. A receiving convex portion 58 is formed on a side surface of the core holder 52, and the receiving convex portion 58 is located between both the flange portions 56 and 57. That is, the receiving projection 58 is relatively movable between the two flanges 56 and 57, but has a stroke d of 2 mm.

Further, a first movable core 61 as a first closing body for closing the secondary product cavity 33a is fixed to the core holder 52 so as to protrude toward the fixed mold 31 side.
The first movable core 61 slidably penetrates the first movable component plate 46 and the fixed core 51, and has a fixed end face.
31 abuts against the first receiving surface 40. Note that a cooling water passage 62 is formed in the first movable core 61.

Further, the core holder 52 has a second closing body as a second closing body for closing the secondary product cavity 33a.
The movable core 66 is supported so as to be movable in a predetermined range in the mold opening and closing direction. The second movable core 66 slidably penetrates the first movable component plate 46 and the fixed core 51,
The distal end surface abuts on the second receiving surface 41 of the fixed die 31. A flange 67 is fixed to an end of the second movable core 66 opposite to the fixed mold 31. This flange 67
Are first receiving surfaces 68 each facing the opposite side of the fixed mold 31.
And a second receiving surface 69. This second receiving surface
69 is located closer to the fixed die 31 on the outer peripheral side than the first receiving surface 68. On the other hand, the fixed mold 31 in the core holder 52
A concave portion 71 is formed on the surface opposite to
An annular core retainer through which the flange 67 penetrates the inside
72 is fixed. The core retainer 72, which forms a part of the core holder 52, has an inward flange 73 at a portion of the inner periphery opposite to the fixed die 31.
The surface on the 31 side is fixed to the second receiving surface 69 of the flange 67.
And a pressing surface 74 that comes into contact from the opposite side. Further, the second movable core 66 is urged toward the opposite side of the fixed mold 31 with respect to the core holder 52 by a spring 76 as urging means mounted between the flange 67 and the core holder 52. I have. On the other hand, a stopper 77 is fixed to a surface of the fourth movable component plate 49 on the fixed die 31 side, and a surface of the stopper 77 on the fixed die 31 side is the flange.
A locking surface 78 abuts on a first receiving surface 68 of the 67.
That is, this locking surface 78 locks the second movable core 66 against the bias of the spring 76, and the first receiving surface 68 and the locking surface 78 are in contact with each other. In the flange
A predetermined gap e (0.34 mm) is formed between the second receiving surface 69 of the 67 and the pressing surface 74 of the core holder 52.

Further, as shown in FIG.
Although it is individually obtained, there is only one core holder 52 in the entire mold apparatus, and the core holder 52 is common to the eight product cavities 33. On the other hand, the movable cores 61 and 66
In particular, the control mechanism such as the flange 67, the core presser 72, the spring 76, and the stopper 77 of the second movable core 66 is completely independent for each product cavity 33. Are designed to operate independently.

Although not shown, the movable die 32 is provided with a core holder holding device that locks the core holder 52 in a state where the core holder 52 is moved to the fixed die 31 side.

Further, a protruding plate 81 is provided inside the third movable mold plate 48 so as to be movable within a predetermined range in the mold opening and closing direction. A projecting pin (not shown) for projecting the formed product 1 is provided on the projecting plate 81.
Has been fixed.

Next, the operation of the above configuration will be described. FIG. 1 shows a state in which the fixed mold 31 and the movable mold 32 are closed, and the movable cores 61 and 66 are farthest from the fixed mold 31. In this state, the receiving protrusion 58 of the core holder 52 is in contact with the flange 56 of the hydraulic cylinder 54 on the fixed mold 31 side,
A gap d of 2 mm is formed between the receiving convex portion 58 and the flange 57 on the opposite side of the fixed mold 31 of the hydraulic cylinder 54. Further, between the stopper 53 of the core holder 52 and the first movable mold plate 46 and between the first movable core 61 and the first receiving surface 40 of the fixed mold 31.
And a gap c of 0.83 mm is generated between them. Further, a stopper 77 is provided on the first receiving surface 68 of the second movable core 66.
Of the second movable core 66 and the pressing surface 74 of the core holder 52 are 0.34 mm.
Gap e is generated. Further, a gap f of 0.49 mm is formed between the second movable core 66 and the second receiving surface 41 of the fixed die 31.

In this state, when the hydraulic cylinder 54 is driven to advance the piston rod 55 toward the fixed mold 31 side, as shown in FIG.
The flange portion 57 on the opposite side of the abutment 31 comes into contact with the receiving convex portion 58 of the core holder 52, the gap therebetween becomes zero, and thereafter, the core holder 52 and the first movable The core 61 moves to the fixed mold 31 side. Even when the core holder 52 starts to move in this manner, the state in which the locking surface 78 of the stopper 77 abuts on the first receiving surface 68 of the second movable core 66 due to the bias of the spring 76 is maintained. Core holder 52 is e
(0.34 mm), the pressing surface 74 of the core holder 52 comes into contact with the second receiving surface 69 of the second movable core 66, and the gap between them becomes zero. When pushed, the second movable core 66 also moves integrally to the fixed mold 31. Therefore, the first receiving surface 68 of the second movable core 66 is separated from the locking surface 78 of the stopper 77. At the time when the second movable core 66 starts to move, the gap between the stopper 53 of the core holder 52 and the first movable mold plate 46, the first movable core 61 and the first Receiving surface 40
Between the second movable core 66 and the fixed mold 31.
Both of the gaps with the receiving surface 41 are f (0.49 mm).

Then, from the time when the second movable core 66 starts to move, the core holder 52 moves by f (0.49 mm), and finally, as shown in FIG. The first movable core 61 abuts on the first receiving surface 40 of the fixed mold 31 when the first movable core 61 abuts on the first receiving surface 40 of the fixed mold 31 and the gap between them becomes zero. Then, the second movable core 66 comes into contact with the second receiving surface 41 of the fixed mold 31, and the gap between them becomes zero.

As described above, the first movable core 61 and the second movable core 66 are differential, and the stroke of the second movable core 66 is larger than the stroke c (0.83 mm) of the first movable core 61. f
(0.49mm) is smaller.

In two-color molding, which is a two-material molding, as shown in FIG. 3, first, the fixed mold 31 and the movable mold 32 are closed, and the two movable cores 61 and 66 are formed as described above.
Is in contact with the fixed mold 31. In this state, a primary product cavity 33a is formed between the fixed mold 31, the movable mold 32, and the movable cores 61 and 66. A portion that becomes the secondary product cavity 33b at the time of secondary molding described later is closed by the movable cores 61 and 66. And this primary product cavity 33
a is filled with a primary resin A made of an opaque thermoplastic resin from a primary material passage 37a through a primary gate 38a (primary molding).

After the primary resin A filled in the primary product cavity 33a is cooled and solidified, the hydraulic cylinder 54 is driven to retract the piston rod 55 to the side opposite to the fixed mold 31. With the movement of the piston rod 55, the flange 56 on the fixed mold 31 side comes into contact with the receiving projection 58 of the core holder 52. Thereafter, the core holder 52 and the first movable The core 61 moves to the opposite side of the fixed mold 31 and separates from the fixed mold 31. Also, the second movable core 66
Also, the urging of the spring 76 keeps the second receiving surface 69 in contact with the pressing surface 74 of the core holder 52, moves with the core holder 52, and separates from the fixed mold 31. The second movable core 66 finally has the first receiving surface 68
Is moved until it abuts against the locking surface 78, and is locked there. Thereafter, the core holder 52 is moved to the third movable component plate 48.
, Only the core holder 52 and the first movable core 61 move. Thus, the first movable core 61
Moves to the side opposite to the fixed mold 31 by a stroke c (0.83 mm), and the second movable core 66 moves to the side opposite to the fixed mold 31 by a stroke f (0.49 mm), and becomes the state shown in FIG.

In this state, the secondary product cavity 33b is formed between the fixed mold 31, the movable mold 32, the movable cores 61 and 66 thereof, and the primary resin A solidified in the primary product cavity 33a.
Then, the secondary material passage 37b is inserted into the secondary product cavity 33b.
Is filled with a secondary resin B made of a transparent thermoplastic resin through a secondary gate 38b (secondary molding).

After the secondary resin B filled in the secondary product cavity 33b is solidified, the fixed mold 31 and the movable mold 32 are opened, and the primary resin molded in the primary product cavity 33a is opened. And secondary resin B molded in secondary product cavity 33b
And take out the product 1 which is integrated. Then fixed type
The mold 31 is closed again with the movable mold 32, and the above molding process is repeated.

As described above, the provision of the first movable core 61 and the second movable core 66 having different strokes allows the step portion 4 to be formed in the transparent portion 2 of the product 1 which is formed secondarily. Will be possible. Then, in order to delay the operation of the second movable core 66 with respect to the first movable core 61, the second movable core 66 is fixed to the core holder 52 to which the first movable core 61 is fixed.
The second movable core 66 is urged toward the opposite side of the fixed mold 31 with respect to the core holder 52 by a spring 76, and is fixed to the fourth movable mold component plate 49. The second movable core 66 is locked by the locking surface 78 of the stopper 77 against the spring 76, and the second movable core 66 is separated from the locking surface 78 by the core holder 52. In this state, the second movable core 66
The pressing surface 74 that presses the movable core 66 toward the fixed mold 31 is formed. Therefore, in addition to the first core holder 16 to which all the first movable cores 14 are fixed, Compared with the case where the second movable core 15 is used and the second core holder 17 to which the second movable core 15 is fixed, the driving mechanism of the movable cores 61 and 66 is made compact, and the entire die apparatus can be made compact. In addition, flange 67, core presser 72, spring 76 and stopper
Since the control mechanism of the second movable core 66 composed of 77 or the like is completely independent for each second movable core 66 corresponding to the plurality of product cavities 33,
Since the movable core 66 can be adjusted, high accuracy can be easily secured, and since the control mechanism of each second movable core 66 is small, maintenance can be easily performed. Therefore, it is possible to easily and surely cope with a case where the number of pieces is large, such as the eight pieces in this embodiment.

It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made. For example,
In the embodiment, the spring 76 is used as the urging means for urging the second movable core 66 to the side opposite to the fixed mold 31 with respect to the core holder 52, but the urging means is not limited to the spring. Instead, an appropriate means such as a disc spring or an air cushion can be used. In the above-described embodiment, the hydraulic cylinder 54, which is the drive source of the core holder 52, is provided in the mold device itself. However, the drive source of the core holder also serves as the hydraulic cylinder in the molding machine to which the mold device is attached. And so on. Further, in the above-described embodiment, the movable cores 61 and 66, which are closing bodies for closing the primary product cavity 33a, are provided on the movable mold 32 side. However, the closing bodies may be provided on the fixed mold side. Further, the molded product is not limited to the one shown in FIG. Further, although the die apparatus of the above-described embodiment has eight pieces, the number of pieces can be set as appropriate. For example, the present invention can be applied to a one-piece mold apparatus.

[0033]

According to the present invention, in order to form a step, a two-material molding die apparatus having a first closing body and a second closing body having a smaller stroke than the first closing body. In the above, the first closing body is fixed to the closing body substrate movably supported by the first mold and driven by the driving source, and the second closing body is movably moved in the same direction as the moving direction of the closing body substrate. In addition to supporting the second closing body, the second closing body is urged against the closing body substrate in a direction away from the second mold body by the urging means, and the second mold body is pressed against the first mold body against the urging means. A locking surface for locking the closing body is formed, and the second closing body abuts on the closing body substrate in a state where the second closing body is separated from the locking surface and the second closing body is moved to the second closing body. Since the pressing surface for pressing toward the mold body of No. 2 was formed,
The drive mechanism of the closing body is made compact, the entire mold apparatus can be made compact, and further, as in the invention of claim 2,
In the case of a plurality of products, since the second closing body can be adjusted for each product cavity, high accuracy can be easily secured, and maintenance can be easily performed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a two-material molding die apparatus of the present invention, showing a state where a first movable core and a second movable core are farthest from a fixed mold.

FIG. 2 is a sectional view of the same, showing a stage in which the first movable core is moving to a fixed mold side.

FIG. 3 shows a state in which the first movable core and the second movable core abut against a fixed mold.

FIG. 4 is a schematic plan view of the same movable type.

FIG. 5 is a perspective view of a product to be molded.

FIG. 6 is a cross-sectional view illustrating an example of a conventional two-material molding die apparatus, in which a first movable core and a second movable core are farthest from a fixed mold.

FIG. 7 is a sectional view of the same, showing a stage in which the first movable core is moving to the fixed mold side.

FIG. 8 shows a state in which the first movable core and the second movable core abut against a fixed mold.

[Explanation of symbols]

 31 Fixed mold (2nd mold) 32 Movable mold (1st mold) 33 Product cavity 33a Primary product cavity 33b Secondary product cavity 52 Core holder (closed substrate) 54 Hydraulic cylinder (drive source) 61 1 movable core (first closed body) 66 second movable core (second closed body) 74 pressing surface 76 spring (biasing means) 78 locking surface A primary resin (molding material) B secondary resin (Molding material) c Stroke of first movable core f Stroke of second movable core

Claims (2)

[Claims] A first mold body and a second mold body which are mutually opened and closed to form a product cavity therebetween when the mold is closed, and wherein a plurality of closing bodies are movably provided in the first mold body. , By contacting these closures with the second mold,
Forming a primary product cavity between the mold body, the second mold body and the closing body, separating the closing body from the second mold body, and forming material filled in the primary product cavity. Two-material molding forming a secondary product cavity between a mold and a closing body, and having as the closing body a first closing body and a second closing body having a smaller stroke than the first closing body. A closing mold substrate movably supported by the first mold body; and a drive source for driving the closing body substrate, wherein the first closing body is fixed to the closing body substrate. A direction in which the second closing body is movably supported in the same direction as the moving direction of the closing body substrate and the second closing body is separated from the second mold body by a biasing means with respect to the closing body substrate. To lock the second closing body against the first mold against the urging means. A locking surface is formed, and the second closing body is brought into contact with the second closing body on the closing body substrate in a state where the second closing body is separated from the locking surface. A molding device for two-material molding, characterized in that a pressing surface for pressing toward the side is formed. 2. The two-material molding die apparatus according to claim 1, wherein a plurality of product cavities are provided, and said second closing member is provided independently for each product cavity.