JP3293319B2 - Injection molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding apparatus, and more particularly to an improvement in an injection molding die for performing multicolor molding including dissimilar material molding using a slide core.

[0002]

2. Description of the Related Art Conventional multi-color injection molding apparatuses of this kind are disclosed in Japanese Patent Application Laid-Open Nos.
The technology described in JP-A-12267 or JP-A-57-19663 can be exemplified.

[0003] These disclose a core-back type injection mold having a set of fixed and movable dies. That is, in this technique, a molding space having the same shape as the final molded product is formed between the fixed mold cavity and the movable mold core, and the slide core is linearly movable in a direction approaching and moving away from the cavity. Then, the slide core is brought close to the cavity, and is arranged in a molding space having the same shape as the final molded product between the cavity and the core, and a molding space for primary molding excluding the slide core portion is formed. Perform molding. Further, without opening the parting surface between the cavity and the core, the slide core is separated from the cavity to form an opening-shaped molding space for secondary molding in the primary molded product formed between the cavity and the core. And secondary injection molding to obtain a multicolor molded product having a secondary molded product as a part of the primary molded product.

A conventional injection molding apparatus of this type for multicolor molding is disclosed in Japanese Patent Publication No. 1-3, filed by the present inventor.
The technology described in JP-A-8657 or JP-B-5-3808 can be mentioned.

[0005] These disclose a rotary injection mold using two sets of molds. That is, this technique includes a movable mold having a core commonly used for primary molding and secondary molding, and a fixed mold having a cavity for primary molding and a cavity for secondary molding. Then, by rotating the fixed mold, the cavity for the primary molding and the cavity for the secondary molding are selectively opposed to the core of the movable mold, and the primary injection molding and the secondary injection molding are sequentially performed. I have to.

As a conventional injection molding apparatus for this type of multicolor molding, there is an injection molding die of a nested slide type. In this technique, a cavity for primary molding and a cavity for secondary molding are provided in a fixed mold, and a nest that constitutes a core commonly used in primary molding and secondary molding is provided in a movable mold. The child is slid from the cavity for primary molding to the cavity for secondary molding so as to sequentially perform primary injection molding and secondary injection molding.

[0007]

Since the conventional core-back type injection mold is configured as described above, the structure for the core-back is simple, the product cost of the mold is reduced, and In addition, it is possible to switch from the primary molding to the secondary molding simply by moving the slide core back and forth, and there is an advantage that the molding cycle is fast. On the other hand, since the injection molding die shares the cavity during the primary molding and the secondary molding, the position of the molding space for the secondary molding due to the movement of the slide core must be within the molding space for the primary molding. However, since the position is restricted, the product shape of the multicolor molded product is restricted. That is, there is a degree of freedom in the shape of the secondary molded product only within the range of the shape of the primary molded product. Furthermore, since the fixed mold and the movable mold are not opened, depending on the product shape, the primary molded product shrinks to form a gap between the outer periphery of the primary molded product and the cavity, and the resin flows into the gap during the secondary molding. Therefore, burrs may be generated on the secondary molded product.

[0008] Japanese Patent Publication No. 5-49448 discloses that
In the core-back type injection mold, a technique for securing and improving the operating state of the core (particularly the backward movement state) has been disclosed. However, this technique also has a limitation in the product shape,
Also, burrs may be generated on the secondary molded product.

Further, Japanese Patent Publication No. Hei 5-35660 discloses that
A rotary injection mold for preventing burrs on the outer periphery of a primary molded product is disclosed. In this technology, a primary molding cavity and a secondary molding cavity are selectively opposed to a pair of movable mold cores that are reciprocally driven, and primary injection molding and secondary injection molding are performed. Are sequentially performed.

[0010] However, the rotary injection mold disclosed in Japanese Patent Publication No. 5-35660 can appropriately cut off burrs generated on the primary molded product when the rotary mold rotates after the primary molding.
Further, although there are few restrictions on the product shape, the product cost of the mold is higher and the molding cycle is slower than the core-back type injection mold.

Therefore, the technology disclosed in Japanese Patent Publication No. 1-36577 or Japanese Patent Publication No. 5-3808,
Although it has the same advantages as the technology disclosed in Japanese Patent Publication No. 5-35660, the product cost of the mold is higher than that of the core-back type injection mold, and the molding cycle may be slow.

Furthermore, the injection molding die of the nested slide type has an intermediate feature between the core-back type die and the rotary type die, and has both advantages. Can be said to remain. Further, in order to obtain a primary molded product and a secondary molded product by combining a single nest as a core and two cavities, the size of the molded product depends on the size of the nest as a core. Is slid by a slide mechanism to perform the primary molding and the secondary molding continuously. Therefore, there is a limit in increasing the size of the nesting, and it is not suitable for a mold for a large product.

The technology disclosed in Japanese Patent Publication No. 503808 discloses a rotary mold using a moving core. However, the product cost of the mold is still lower than that of a core-back injection mold. Higher, and the molding cycle is slower.

Further, the technology disclosed in Japanese Patent Publication No. 5-35660 discloses a rotary die, but
The product cost of the mold is higher and the molding cycle is slower than the core-back injection mold. In addition, when the primary molded product has a protruding rising portion, a special configuration is required to prevent the rising portion from falling inward due to shrinkage of the primary molded product after the primary molding.

As a technique for performing multicolor molding with one set of dies, there are a technique described in Japanese Patent Application Laid-Open No. 57-203531 and a technique described in Japanese Patent Application Laid-Open No. 52-12267. In any case, the degree of freedom of the shape of the molded product is limited, and the molded product may be damaged by the mold.

Furthermore, the technique disclosed in Japanese Patent Publication No. 5-49448 discloses a core-back mold, but requires adjustment of the mold clamping pressure.

Therefore, the present invention can increase the degree of freedom in the shape of the product, improve the appearance quality by reliably removing the burrs of the molded product, and reduce the product cost of the mold. It is an object of the present invention to provide an injection molding apparatus which can be maintained at a low level, can shorten a molding cycle, and can be applied as a mold for large products.

[0018]

An injection molding apparatus according to the first aspect of the present invention comprises a primary core having an engraved surface corresponding to one side of a primary molded product, and a mold corresponding to the other side of the primary molded product. A primary cavity having a carved surface and being clamped to the primary core to form a primary molding space having the same shape as a primary molded product; Primary driving means for relatively moving in the direction to clamp and open the mold, and a secondary cavity of a die-sinking surface corresponding to the shape of the secondary molded product, which is divided and clamped to each other, and A plurality of secondary slide cores having the same shape as the overall shape of the secondary molded product, and forming a secondary molding space continuous with the primary molding space, and the plurality of secondary slide cores, Core and primary cavity transfer Comprising a secondary drive means for opening mold clamping and mold moves in a direction different from directions.

An injection molding apparatus according to a second aspect of the present invention
A primary core provided on one of the fixed main die and the movable main die and having a die-sculpted surface corresponding to one side surface of the primary molded product; and a primary core provided on the other of the fixed main die and the movable main die, and A primary cavity having a die-sinking surface corresponding to a side surface and being clamped to the primary core to form a primary molding space having the same shape as a primary molded product; and the primary core and the primary cavity. Having a primary side driving means for relatively moving in a direction of approaching and separating from each other and clamping and opening the mold, and a secondary side cavity of a die engraving surface corresponding to the shape of the secondary molded article, and A plurality of secondary slide cores that are tightened and have the same shape as the overall shape of the secondary molded product as a whole, and form a secondary molding space that is continuous with the primary molding space; and the plurality of secondary slides. The core is connected to the primary core and the primary key. Move in a direction different from the moving direction of the Activity; and a secondary driving means for opening the mold clamping and mold.

According to a third aspect of the present invention, there is provided an injection molding apparatus comprising:
In the invention of claim 2, a predetermined draft is provided in the primary core and the primary cavity, and at least one of the primary core and the primary cavity is applied to the secondary slide core at the time of mold clamping. A support surface is provided for contacting and supporting the primary core and the primary cavity in a state of being separated by a predetermined distance.

An injection molding apparatus according to a fourth aspect of the present invention
A primary core provided on one of the fixed mold and the movable mold and having a die-sinking surface corresponding to one side surface of the primary molded product; and a primary core provided on the other of the fixed mold and the movable mold and having another side surface of the primary molded product. A first engraving surface corresponding to the part, and a first primary molding space having the same shape as a shape of one side surface and a part of the other side surface of the primary molded product, being clamped to the primary side core; A primary cavity, and a second primary cavity of a die-sinking surface corresponding to a part other than the part of the other side surface of the primary molded product, which is divided and clamped to one side of the primary molded product A plurality of primary slide cores forming a second primary molding space having the same shape as a portion other than the above-mentioned part, and a first slide for moving the primary core and the primary cavity closer to and away from each other.
A first primary driving means for relatively moving in the direction of the mold to clamp and open the mold, and moving the plurality of primary slide cores in a second direction different from the moving direction of the primary core and the primary cavity. A second primary side driving means for clamping and opening the mold, and a secondary side cavity of a die-sinking surface corresponding to the shape of the secondary molded product. A plurality of secondary slide cores having the same shape as the overall shape of the next molded product, and forming a secondary molding space continuous with the primary molding space, and the plurality of secondary slide cores, the primary core And a secondary-side driving unit that moves in a third direction different from the moving direction of the first primary-side cavity and the moving direction of the primary-side slide core to clamp and open the mold.

[0022]

According to the first aspect of the present invention, when the primary side driving means is driven to clamp the primary side core and the primary side cavity, a primary molding space having the same shape as the primary molded product is formed therebetween. Thus, primary molding can be performed. At this time, the secondary slide core is held in the mold open state, so that the secondary slide core does not interfere with the primary core or the primary cavity to hinder its operation. Further, after the primary molding, the primary side driving means is driven to open the primary side core and the primary side cavity, and then, the secondary side driving means is driven, and the plurality of secondary side sliding cores are connected to the primary side core. When the mold is moved in a direction different from the moving direction of the primary cavity and the mold is clamped, a secondary molding space having the same shape as the overall shape of the secondary molded product is formed therebetween, and secondary molding is enabled. At this time, the primary side core and the primary side cavity are held in the mold open state so as not to interfere with the secondary side slide core and hinder its operation. In this operation, since the primary side cavity for the primary molding and the secondary side cavity for the secondary molding are provided completely separately, the shape of the secondary molded product is limited by the relationship with the shape of the primary molded product. There is no. As a result, the degree of freedom of the shape of the final molded product can be increased. In addition, after the primary molding, the primary core and the primary cavity are temporarily opened, and then the secondary molding is performed. Therefore, even if burrs are formed on the primary molded product, the burrs are removed when the mold is opened. As a result, the appearance quality of the molded article can be improved.

According to the second aspect of the present invention, when the primary side driving means is driven to clamp the primary side core and the primary side cavity, a primary molding space having the same shape as the primary molded product is formed therebetween. Thus, primary molding can be performed. At this time, the secondary slide core is held in the mold open state, so that the secondary slide core does not interfere with the primary core or the primary cavity to hinder its operation. Further, after the primary molding, the primary side driving means is driven to open the primary side core and the primary side cavity, and then, the secondary side driving means is driven, and the plurality of secondary side sliding cores are connected to the primary side core. When the mold is moved in a direction different from the moving direction of the primary cavity and the mold is clamped, a secondary molding space having the same shape as the overall shape of the secondary molded product is formed therebetween, and secondary molding is enabled. At this time, the primary side core and the primary side cavity are held in the mold open state so as not to interfere with the secondary side slide core and hinder its operation. In this operation, since the primary side cavity for the primary molding and the secondary side cavity for the secondary molding are provided completely separately, the shape of the secondary molded product is limited by the relationship with the shape of the primary molded product. There is no. As a result, the degree of freedom of the shape of the final molded product can be increased. In addition, after the primary molding, the primary core and the primary cavity are temporarily opened, and then the secondary molding is performed. Therefore, even if burrs are formed on the primary molded product, the burrs are removed when the mold is opened. As a result, the appearance quality of the molded article can be improved.

According to the third aspect of the present invention, after the primary molding, the primary core and the primary cavity are opened, and a plurality of secondary slide cores are clamped, so that the primary core and the primary cavity become secondary. The support surface of the side slide core is separated and held in a state of being separated by a predetermined distance. At this time,
Because the primary core and the primary cavity are provided with a predetermined draft, the surface of the primary molded product is separated from the primary core or the primary cavity (especially at their corners), and the primary core or the primary cavity is separated from the primary core or the primary cavity. There is no contact with the side cavities. As a result, there is no problem such as the surface of the primary molded article being in contact with the primary core or the corner of the primary cavity and being damaged, and the appearance quality of the molded article can be maintained satisfactorily.

According to the fourth aspect of the present invention, when the first primary side driving means is driven to move the primary side core and the first primary side cavity in the first direction and mold-clamp, the primary side is interposed therebetween. A primary molding space having the same shape as the shape between one side surface of the molded product and a part of the other side surface is formed. On the other hand, when the second primary driving means is driven to move the plurality of primary slide cores in the second direction and clamp the mold, the primary core, the first primary cavity, and the plurality of primary slide cores are moved. A primary molding space having the same shape as that of the primary molded product is formed between the second primary side cavity and the primary molding, so that primary molding can be performed. At this time, the secondary slide core is held in the mold open state, so that the secondary slide core does not interfere with the primary core, the first primary cavity, and the primary slide core to interfere with the operation thereof.
Then, after the primary molding, the first primary side driving means is driven to open the mold of the primary side core and the first primary side cavity, and the second primary side driving means is driven to drive the first side of the primary side sliding core. After opening the primary side cavity of the second, the secondary side driving means is driven to move the plurality of secondary side slide cores to the third side.
When the mold is moved in the direction described above, a secondary molding space having the same shape as the overall shape of the secondary molded product is formed therebetween, and secondary molding is enabled. At this time, the primary side core, the first primary side cavity, and the primary side slide core are held in the mold open state so as not to interfere with the secondary side slide core to hinder the operation. In such an operation, the first and second primary cavities for the primary molding and the secondary cavities for the secondary molding are provided completely separately, so that the shape of the secondary molded product is different from the shape of the primary molded product. You are not restricted by relationship. As a result, the degree of freedom of the shape of the final molded product can be increased. In addition, after the primary molding, the primary core, the first primary cavity, and the primary slide core are opened once, and then the secondary molding is performed. Removed when opening the mold. As a result, the appearance quality of the molded article can be improved.

[0026]

Embodiments of the present invention will be described below. The injection molding apparatus of the present invention is an application of the idea of a core-back type injection molding apparatus and a mold nesting type injection molding apparatus, and is used for injection molding various multicolor molded articles including different-color molded articles. . In the examples described below, an electric polisher for waxing an automobile shown in FIGS. 16 and 17 is illustrated as an example of an injection molded product. First, such an injection molded product will be described.

FIG. 16 is a perspective view showing a resin molded product manufactured by the injection molding apparatus according to one embodiment of the present invention. FIG.
FIG. 7 is a sectional view showing a resin molded product manufactured by the injection molding apparatus according to one embodiment of the present invention.

In the figure, the injection molded product is a base 21
, A protector 23 and a sponge 25. The base 21 is made of a hard resin or the like, and has one side surface (the lower surface in the figure).
It has a disk shape having a flange 22 extending downward on its outer periphery, and a connecting projection 21a is provided at the center of the other side surface (upper surface in the drawing) to project upward, so that a drive shaft of a motor of the main body of the electric polisher (not shown). It can be freely connected to. On the lower side of the outer peripheral surface of the flange 22 of the base 21, a concave portion 22a is formed continuously in the circumferential direction (for example, over the entire circumference or a part in the circumferential direction). The protector 23 is made of a soft resin or the like, and is integrally formed continuously (preferably, over the entire circumference or partially in the circumferential direction) on the outer peripheral surface of the flange 22 of the base 21. Protector 23
Extends from a predetermined distance above the concave portion 22a of the flange 22 to a predetermined distance below the lower end of the flange 22. A portion of the protector 23 below the lower end of the flange 22 is an undercut portion 23a.
The base 21 constitutes a primary molded product of the present embodiment, and the protector 23 constitutes a secondary molded product. The injection molding apparatus of the present embodiment is configured to integrally mold the base 21 and the protector 23. Note that a sponge 25 made of a foamed resin or the like is separately molded inside the integrally molded base 21 and the protector 23 and fixed in a later step,
Construct an electric polisher as a final product.

Next, the injection molding apparatus of the first embodiment will be described with reference to an injection mold.

FIG. 1 is a sectional view showing a state in which a molding space for a base is formed by clamping a mold of an injection molding apparatus according to a first embodiment of the present invention. FIG. 2 is a plan view showing a state where the slide core at a standby position of the injection molding apparatus of FIG. 1 is viewed from above, and schematically shows a relationship between the main core and the slide core. FIG. 3 is a sectional view showing a state in which the injection molding apparatus of FIG. 1 is opened after injection molding of the base and the slide core is moved to a use position. FIG. 4 is a front sectional view showing a state in which the injection molding apparatus of FIG. 3 is clamped again, a molding space for the protector is formed, and the protector is injection molded. FIG. 5 is FIG.
It is sectional drawing of the side surface of the injection molding apparatus of (1). FIG. 6 is a cross-sectional view showing a state in which the injection molding apparatus of FIG. 4 is opened after the injection molding of the protector and the slide core is returned to the standby position.

As shown in FIG. 1, in the injection molding apparatus of this embodiment, a main cavity 31a constituting a primary side cavity is provided on a stationary mold plate 31 constituting a stationary main mold.
The main cavity 31a has an engraved surface corresponding to one side surface of the base 21 as a primary molded product (the entire upper surface and a portion excluding the concave portion 22a on the outer peripheral surface of the flange 22). A guide hole 33a having the same shape as the inner peripheral surface of the flange 22 of the base 21 is formed in a central portion of the movable mold plate 33 that constitutes the movable main mold, facing the main cavity 31a. The guide hole 3 is provided on the upper surface of the movable mold plate 33.
Along the outer periphery of 3a, an auxiliary cavity 33b having a die-cut surface corresponding to the lower end surface of the flange 22 is formed from the concave portion 22a below the flange 22 of the base 21. The auxiliary cavity 33b of the movable mold plate 33, together with the main cavity 31a, forms a primary cavity having the same shape as the entire side surface of the base 21 (entire upper surface, entire outer peripheral surface of the flange 22, and lower end surface of the flange 22). The movable mold plate 33 is provided with a receiving hole 33c having a diameter larger than that of the guide hole 33a and extending downward continuously from the guide hole 33a. A stepped regulating surface 33d is formed by the upper surface of the receiving hole 33c.
Is configured. The guide hole 33a and the housing hole 33c penetrate the movable mold plate 33 in the thickness direction.

A main core 35 constituting a primary side core is slidably inserted in the vertical direction (axial direction) from below into the guide hole 33a from the accommodation hole 33c of the movable mold plate 33. The main core 35 has a flange 3 projecting outward at the lower end.
5a is integrally formed, and the side surface or the outer peripheral surface of the upper portion of the flange 35a is a guide portion 35b having substantially the same diameter and the same shape as the guide hole 33a, and the guide portion 35b is vertically slid along the guide hole 33a. It is free to move. In the present embodiment, as shown in FIG. 2, the guide portion 35b of the main core 35 has a columnar shape corresponding to the inner surface shape of the base 21 of the electric polisher which is a primary molded product. Thus, at the position of the main core 35 shown in FIG. 1 (hereinafter, referred to as a primary molding position), the upper end of the guide portion 35b of the main core 35 (the portion projecting upward from the bottom surface of the auxiliary cavity 33b of the movable mold plate 33). Of the base 21 is the flange 2
2 and the same engraving surface corresponding to the inner peripheral surface. In addition, the upper surface of the flange 35a of the main core 35 is a regulating surface 35d that is supported in contact with the regulating surface 33d of the accommodation hole 33c of the movable mold plate 33. As shown in FIG. It stops at a position (hereinafter, referred to as a secondary molding position) projecting above the upper surface of the movable mold plate 33 by a predetermined height from the primary molding position shown in FIG.

An insertion hole 35c having a substantially T-shaped cross section is formed in the axial direction of the main core 35, and penetrates the main core 35 vertically from the upper surface to the lower surface. A push-up block 37 having substantially the same cross-sectional shape as the large-diameter portion above the insertion hole 35c is inserted into the large-diameter portion above the insertion hole 35c of the main core 35 from above. A push-out pin 39 extending downward from the lower end of the push-up block 37 integrally with the small-diameter portion below the large-diameter portion of the insertion hole 35c and having substantially the same cross-sectional shape as the small-diameter portion of the insertion hole 35c. Is inserted. The push-up block 37 and the push-out pin 39 are slidable up and down along the insertion hole 35c, and the push-up block 37 projects upward from the insertion hole 35c as shown in FIG. 1), and as shown in FIG.
c (hereinafter referred to as a molding position). More specifically, the push-up block 37 has, for example, a small-diameter circular shape corresponding to a plane circular main core 35 in a plane thereof, and has a disk-like upper portion and a lower side. It is preferable that the portion is formed in a cone shape whose diameter is reduced downward, and the extrusion pin 39 is also formed in a cylindrical shape having a further smaller diameter from the viewpoint of smoothing the sliding operation and the like. Further, the upper surface of the push-up block 37 is formed so as to be flush with the upper surface of the main core 35 at the molding position where it has returned to the insertion hole 35c. Accordingly, when the main core 35 is at the primary molding position and the push-up block 37 is at the molding position, the upper surface of the push-up block 37 together with the upper surface of the main core 35 has the same shape as the lower surface of the base 21. Further, together with the upper surface and the outer peripheral surface of the upper end of the main core 35, a die-sculpted surface corresponding to the other side surface of the base 21 (from the inner peripheral surface of the flange 22 to the lower surface of the base 21) is formed. The push-up block 37, together with the main core 35, constitutes a primary core of a die-sinking surface corresponding to the other side surface of the base 21. Thereby, the main cavity 3 of the fixed side mold plate 31 is located at the mold clamping position shown in FIG.
1a, a primary molding space having the same shape as that of the base 21 is formed between the auxiliary cavity 33b of the movable mold plate 33, the main core 35, and the push-up block 37.

The main core 35 may be provided on one of the fixed main die and the movable main die, and may have a die-cut surface corresponding to one side surface of the primary molded product.
1a is provided on the other of the fixed main die and the movable main die, has a die-sculpted surface corresponding to the other side surface of the primary molded product, and is clamped to the main core 35 to have the same shape as that of the primary molded product. What is necessary is just to comprise so that a primary molding space may be formed.

The movable mold plate 33 is fixed to a movable mounting plate 43 via a back plate 41.
The back plate 41 and the movable-side mounting plate 43 can be moved toward and away from the fixed-side mold plate 31 by a mold clamping device (not shown) to perform mold clamping and mold opening.

A primary hydraulic cylinder 45 as a primary molding driving means is disposed inside the center of the back plate 41. The primary hydraulic cylinder 45 has a portion indicated by an arrow in FIG. 1 fixed to the back plate 41 by screwing with a fastening member such as a bolt. The ram 47 of the primary hydraulic cylinder 45 has its upper end connected to the center of the lower end of the main core 35, and is fitted to the push pin 39 so as to be slidable in the axial direction. Also, as shown in FIG. 1, when the main core 35 is at the primary molding position, the lower end of the ram 47 is at the lowest position where the lower end projects downward from the lower end of the primary hydraulic cylinder 45. As shown in (2), when the main core 35 is at the secondary molding position, the lower end thereof is the highest position where it is immersed in the primary hydraulic cylinder 45. Further, in the central portion of the movable side mounting plate 43 facing the ram 47, a receiving hole 43a having a diameter larger than that of the ram 47 is vertically formed. Housing hole 4 of movable side mounting plate 43
The lower end of 3a is formed in a small-diameter cylindrical shape and has a stepped regulating surface 4.
3b. On the other hand, when the push-up block 37 is set at the molding position, the lower end of
7 extends a predetermined distance downward from the lower end.
A male screw portion 39a is provided at the lower end of the push-out pin 39, and a push-up piece 49 is screwed into the male screw portion 39a via a female screw (not shown) threaded therein. I have. The push-up piece 49 has a cylindrical shape smaller in diameter than the lower end of the housing hole 43a of the movable-side mounting plate 43 and is movable in the axial direction, and has a flange 49a projecting outward on the outer periphery of the upper end. The female screw has a substantially T-shaped cross section, and the female screw is formed in the upper axial direction. The push-up piece 49 supports the lower surface of the flange 49a in contact with the regulating surface 43b of the accommodation hole 43a of the movable-side mounting plate 43,
The falling-down from the accommodation hole 43a is prevented. Further, the ram 47 and the flange 4
9a and a spring member 51 such as a compression coil spring.
When no external force is applied, the distance between the ram 47 and the push-up piece 49 is maintained at a constant distance equal to the length of the extended state (non-biased state) shown in FIG. . A push rod 53 having a columnar shape with the same diameter is connected to the lower end of the push-up piece 49, and the push-out piece 53 is driven vertically (axially) by an extrusion drive means (not shown).
The push-up block 37 is moved vertically from the forming position shown in FIG. 1 to the pushing position shown in FIG. 6 by compressing the spring member 51 against the urging force of the spring member 51 via the pushing pin 39. It is supposed to.

The ram 47 of the primary hydraulic cylinder 45 fixedly connected to the lower end of the main core 35 sets the main core 35 to the primary molding position at the lowest position shown in FIG. 1 and shown in FIGS. At the highest position, the main core 35 is set to the secondary molding position. In the lowermost position of the ram 47 shown in FIG. 1, the push-up piece 49 connected to the lower end of the ram 47 via the spring member 51 has its flange 49 a against the regulating surface 43 b of the accommodation hole 43 a of the movable-side mounting plate 43. When the ram 47 is at the highest position shown in FIGS. 3 to 5, the push-up piece 49 moves upward integrally with the ram 47 via the main core 35, the push-up block 37 and the push-out pin 39.
The flange 49a is separated upward from the regulating surface 49b by the distance the ram 47 is raised. At these positions of the push-up piece 49, the spring member 51 is not biased and is in an extended state. Then, as shown in FIG. 6, the pushing rod 53 is driven upward by the pushing driving means at the highest position of the ram 47, and the push-up piece 49 and the pushing pin 3 are moved.
9, the push-up piece 49 is moved upward from the molding position shown in FIG. 1 to the pushing position shown in FIG.
And the lifting block 37
The flange 49a is separated upward from the regulating surface 43b by a distance obtained by adding the rising distance.

A runner plate 61 is provided on the fixed side mold plate 31.
Are mounted on the runner plate 61 such that the sprue plate 63 can freely approach and separate in the vertical direction. In the left and right portions of the runner plate 61 in FIG.
1a and 61b are formed through the sprue plate 6
3 are provided at corresponding positions on the lower surface of the positioning protrusions 65 and 67 in the form of cones which are aligned with the positioning recesses 61a and 61b.
Are formed, and when the runner plate 61 and the sprue plate 63 are brought into close contact with each other, each of the positioning projections 65, 6
7 are closely fitted in the corresponding positioning recesses 61a and 61b, so that they are relatively positioned at a predetermined position. The primary injection nozzle 6 is located at a position corresponding to the positioning projection 65 on one side (left side in FIG. 1) of the sprue plate 63.
9 and has a shape corresponding to the tip of the primary injection nozzle 69.
And a sprue 71 that penetrates the positioning protrusion 65 in the up-down direction (axial direction) while communicating with the nozzle contact surface 63a.
Are formed.

A runner 73 communicating with the sprue 71 is formed at a position corresponding to the positioning convex portion 65 on the upper surface of the fixed-side mold plate 31 in a substantially angle shape from a horizontal direction along the upper surface to a vertical direction. And a gate (not shown) located at the lower end thereof communicates with the main cavity 31a.
Further, both positioning projections 65 and 67 of the sprue plate 63 are provided.
Between them, a runner lock pin 75 is fixed so as to extend in the up-down direction, and is disposed so as to be able to penetrate the runner plate 61. At the mold clamping position shown in FIG. It is exposed at the upper end of a portion penetrating the fixed mold plate 31 vertically. Thereby, at the time of injection molding,
When the lower end of the runner lock pin 75 is fixed to the resin solidified in the runner 73 and the sprue plate 63 and the runner plate 61 are separated from the fixed mold plate 31 at the mold opening position shown in FIG. The R is automatically removed from the fixed mold plate 31.

The other (right side in FIG. 1) positioning projection 6
At a position corresponding to 7, a hemispherical concave nozzle contact surface 63b having a shape corresponding to the tip of the secondary-side injection nozzle 77 and capable of connecting the secondary-side injection nozzle 77 is formed.
A sprue 79 is formed which communicates with the nozzle contact surface 63b and penetrates the positioning projection 67 in the vertical direction (axial direction). A runner 81 communicating with the sprue 79 is formed at a position corresponding to the positioning protrusion 67 on the upper surface of the fixed-side mold plate 31 in a substantially angle shape from a horizontal direction along the upper surface to a vertical direction. The vertically extending portion of the runner 81 is connected to the fixed side mold plate 31 by the main cavity 31a.
The gate (not shown) located at the lower end of the gate extends a predetermined distance before reaching the main cavity 31a. Further, a runner lock pin 82 is fixed in the vicinity of the positioning protrusion 67 on the right side in FIG. 1 of the sprue plate 63 so as to extend in the vertical direction, and is disposed so as to be able to penetrate the runner plate 61. The tip is exposed at the upper end of a portion of the runner 81 that vertically passes through the fixed mold plate 31 at the mold clamping position shown in FIG. Thereby, at the time of injection molding, the lower end of the runner lock pin 82 is fixed to the resin solidified in the runner 81, and at the mold opening position shown in FIG.
When the sprue plate 63 and the runner plate 61 are separated from the fixed mold plate 31, the resin solidified material R is automatically removed from the fixed mold plate 31.

On the opposing side surfaces (the left side surface and the right side surface in FIG. 1) of the fixed side mold plate 31, two-step-shaped support surfaces 83 and 85 are formed, respectively, and correspond to the support surfaces 83 and 85, respectively. Secondary slide cores 87 and 89 having a two-step shape are provided.
Each is housed closely. As shown in FIG. 2, each of the secondary slide cores 87 and 89 has outer portions 87a and 89a located outside on a predetermined height and inner portions located on a predetermined height smaller than the outside portions 87a and 89a. It is composed of inner portions 87b and 89b. Inside part 87
On the inner surfaces of b and 89b, respectively, the secondary side cavities 87c of the engraving surface having a substantially semi-cylindrical shape corresponding to half the outer peripheral surface of the protector 23, which is a secondary molded product of the injection molded product, and 89c are formed to be symmetrical. Further, in the vicinity of the secondary side cavities 87c, 89c of the inner portions 87b, 89b, runners 87d, 89d each having a substantially semi-cylindrical symmetrical shape are formed so as to extend substantially in the vertical direction. The gates (87b, 89b) are open to the upper surfaces, and gates (not shown) located at the lower ends communicate with the secondary side cavities 87c, 89c, respectively. On the other hand, on the opposite side surfaces (the left side surface and the right side surface in FIG. 1) of the movable side mold plate 33, secondary hydraulic cylinders 91 and 95 are respectively connected via brackets 93 and 97 to fastening members such as bolts. The portion indicated by the arrow in the figure is fixed by screwing or the like. Also, the secondary hydraulic cylinders 91 and 95
Rams 92 and 96 have secondary slide cores 87
And 89 are fixed by screwing or the like with a fastening member such as a bolt.

Thus, the secondary hydraulic cylinders 91, 9
5, the rams 92 and 96 are projected and retracted, and the respective secondary slide cores 87 and 89 are moved between the primary molding position shown in FIG. 1 and the secondary molding position shown in FIG. Control. At the primary molding position, the fixed mold plate 31 is interposed between the mating surfaces 87e and 89e, which are the inner end surfaces of the secondary slide cores 87 and 89, and the outer portions 87a and 89a and the inner portions 87b and 89b are provided.
Are in contact with the entire surfaces of the corresponding support surfaces 83 and 85. At the secondary molding position, the mating surfaces 87e and 8 which are the inner end surfaces of both secondary slide cores 87 and 89 are provided.
9e, the fixed side template 31 is not interposed, and both mating surfaces 87e
And 89e are closely clamped to form the outer portions 87a, 8
9a abuts against the inner end surfaces of the support surfaces 83 and 85, the upper end surface supports the inner step surface continuous with the inner end surfaces of the support surfaces 83 and 85, and the upper surfaces of the inner portions 87b and 89b , Which comes into contact with the lower surface of the fixed-side mold plate 31. That is, the support surfaces 83, 85 or the secondary slide core 8
The outer step and the inner step of 7, 89 have the same height. Then, at the secondary molding position, a secondary molding space having a shape corresponding to the entire outer peripheral surface of the protector 23 as a secondary molded product is provided between the secondary cavities 87c and 89c of the both secondary slide cores 87 and 89. Are formed, and both runners 87d and 89d are integrated so that the upper end thereof communicates with the lower end of the runner 81 of the fixed mold plate 31.

The main core 3 as the primary side core is formed by the mold clamping device (not shown) and the hydraulic cylinder 45.
Primary driving means for relatively moving the mold cavity 5 and the main cavity 31a and the auxiliary cavity 33a as primary cavities toward and away from each other to clamp and open the mold is provided.

The secondary slide cores 87, 89
Has, as described above, divided secondary cavities 87c and 89c of the engraved surface corresponding to the shape of the secondary molded product,
The secondary molding product is clamped to each other to form a secondary molding space having the same shape as the overall shape of the secondary molded product as a whole and continuing from the primary molding space.

Then, the pair of secondary slide cores 87, 89 are moved by the secondary hydraulic cylinders 91, 95 into the main core 35 as the primary core, the main cavity 31a as the primary cavity, and the auxiliary cavity 33a.
The secondary side driving means is configured to move in a direction different from the moving direction of the mold to clamp and open the mold.

Next, a description will be given of a molding method using the injection molding apparatus of the present embodiment configured as described above, together with the operation of the injection molding apparatus. The molding method described below is based on CP
The operation is performed according to a control program stored in the ROM in advance using known control means including U, ROM, RAM, and the like.

First, the primary molding step of injection molding the base 21 and the flange 23 as a primary molded product comprises a mold clamping step shown in FIG. 1, a mold opening step shown in FIG. 3, and the like.

In the mold clamping process shown in FIG. 1, a mold clamping device (not shown) as a primary side driving means is driven to
The movable mold plate 33 integrated with the movable mounting plate 43 is clamped to the fixed mold plate 31. The ram 47 of the primary hydraulic cylinder 45 is set at the lowest position,
Is the primary molding position and extrusion drive means (not shown)
Is driven to set the lifting block 37 as a molding position.
Then, the main core 35 as the primary core and the push-up block 37 are connected to the main cavity 31 as the primary cavity.
a and the auxiliary cavity 33a are clamped, and a primary molding space having the same shape as that of the primary molded product is formed therebetween, thereby enabling primary molding. At this time, the secondary hydraulic cylinders 91 and 95 are driven and controlled, so that the rams 92 and 96 are immersed, and the secondary slide cores 87 and 89 are opened, that is, as shown in FIG. A state in which the end vertical surface is disposed outside the inner end vertical surfaces of the support surfaces 83 and 85 of the fixed-side template 31, or the inner end vertical surface is substantially at the same position and the support surfaces 83 and 85 is kept in sliding contact with the inner end vertical surface so as not to interfere with the fixed-side mold plate 31 so as not to hinder the clamping operation of the fixed-side mold plate 31 and the movable-side mold plate 33.

On the other hand, the mold clamping device is driven to place the runner plate 61 and the sprue plate 63 at predetermined positions on the fixed side mold plate 31, and the positioning protrusion 6 of the sprue plate 63
5 and 67 are closely fitted into the positioning recesses 61 a and 61 of the runner plate 61, and the sprues 71 and 79 of the sprue plate 63 are fitted.
Is communicated with the runners 73 and 81 of the fixed side template 31. Then, the sprue 71 of the sprue plate 63 is
The primary molding space communicates with the primary molding space through the first runner 73 from the main cavity 31a, and then the primary injection nozzle 69
By pressing the lower end against the nozzle contact surface 65a of the sprue plate 63, it becomes possible to inject and inject the molten resin from the primary cavity 31a into the primary molding space via the sprue 71 and the runner 73 from the primary injection nozzle 69. At the same time, the lower ends of the runner lock pins 75 and 82 are
It is exposed in the corresponding runners 73 and 81, and is in a state where it can be joined to the solidified resin R at the time of injection molding.

At this time, in the example shown in FIG. 1, the secondary injection nozzle 77, together with the primary injection nozzle 69, comes close to the sprue plate 63 and is pressed against the nozzle contact surface 65b. The secondary injection nozzle 77 does not need to be pressed against the nozzle contact surface 65b of the sprue plate 63 as shown in FIG. Therefore, the primary injection nozzle 69 and the secondary injection nozzle 77 are separately provided on the sprue plate 6.
3, the primary injection nozzle 69 at the time of primary molding, and the secondary injection nozzle 77 at the time of secondary molding.
Independently of the nozzle contact surfaces 65a, 65 of the sprue plate 63.
5b may be pressed.

In the injection step, an injection device (not shown)
The molten resin is injected and injected into the sprue 71 via the primary injection nozzle 69 from the main cavity 31a, the auxiliary cavity 33a, the main core 35 and the push-up block 37 from the gate located at the lower end thereof via the runner 73. The first molding space is filled with a molten resin. After that, when the resin is cooled and solidified, a primary molded product including the base 21 integrally formed with the flange 22 is molded in the primary molding space. At this time, the sprue 71 on the primary side of the sprue plate 63
The resin also fills the runner 73 on the primary side of the fixed-side mold plate 31 and is cooled and solidified to form a solidified resin R having a shape corresponding to the resin. And, the runner lock pin 7 on the primary side
Since the lower end of 5 is exposed in the runner 73, the lower end 5 is joined to the solidified resin R at the time of injection molding.

After the primary molding of the base 21 and the flange 22, the mold clamping device is driven to separate the movable mold plate 33 from the fixed mold plate 31 in the mold opening step shown in FIG. , The runner plate 61 and the sprue plate 63 are separated from the fixed mold plate 31, and the sprue plate 63 and the runner plate 61 are further separated. As a result, the main core 35 and the push-up block 37 as the primary core and the main cavity 31a constituting the main part of the primary cavity are opened, so that the primary molded product composed of the base 21 and the flange 22 is removed from the main cavity. It is released from the main core 31a and remains on the main core 35. At this time, since the lower end of the runner lock pin 75 on the primary side is joined to the resin solidified material R in the runner 73, the resin solidified material R is opened along with the opening of the mold.
And is automatically cut off from the primary molding at the gate.

Next, the protector 23 as a secondary molded product
Is formed in the concave portion 22a at the lower end of the flange 22 by a mold clamping step and a mold opening step (not shown) shown in FIGS.

That is, after the primary molding, in the step of clamping the secondary slide cores 87 and 89 shown in FIGS. 4 and 5, first,
With the fixed mold plate 31 and the movable mold plate 33 kept in the mold open state shown in FIG. 1, the primary hydraulic cylinder 45 is driven to set the ram 47 to the highest position, and the main core 35 is moved from the primary molding position. Move up to the secondary molding position. The lifting block 37 keeps the molding position following the upward movement of the main core 35. Then, by driving the secondary hydraulic cylinders 91 and 95 as secondary driving means, the pair of left and right secondary slide cores 87 and 89 are moved in the vertical direction which is the moving direction of the primary core and the primary cavity. It moves in the horizontal direction, which is a different direction from the above, to clamp the mold. That is, the rams 92 and 96 are projected, and the secondary slide cores 87 and 89 are moved to the movable mold plate 33.
It slides along the upper surface, and the mating surfaces 87e and 89e are tightly clamped. Then, the secondary slide core 87,
The semicircular lower edge of the inner portions 87b, 89b of 89 is in close contact with the outer peripheral surface of the main core 35 for sealing, and
Inner portions 87b, 89b of secondary slide cores 87, 89
Is in close contact with the outer periphery of the upper end of the flange 22 of the primary molded product on the main core 35. Thereby, the secondary side cavities 87 of both the secondary side slide cores 87 and 89 are provided.
c, 89c, a secondary molding space having the same shape as the entire outer periphery of the protector 25 as a secondary molded product is formed,
Secondary forming of the protector 23 on the outer periphery of the flange 22 becomes possible. At the same time, the runners 87d, 89d of the secondary slide cores 87, 89 are integrated, extend substantially vertically, and the gate located at the lower end thereof is connected to the secondary cavity 87.
c, 89c to the secondary molding space.

At this time, the movable mold plate 33 having the main core 35 as the primary core is kept open with respect to the fixed mold plate 31 having the main cavity 31a as the primary cavity. The side template 31 does not interfere with the moving secondary slide cores 87, 89 so as not to hinder its operation.

Thereafter, as a mold clamping step for the entire mold, the movable mold plate 33 is clamped to the fixed mold plate 31 by the mold clamping device, and the runner plate 61 and the sprue plate 63 are clamped.
Is placed at a predetermined position on the fixed mold plate 31, and the positioning projections 65 and 67 of the sprue plate 63 are closely fitted into the positioning recesses 61 a and 61 of the runner plate 61. Then, as shown in FIGS. 4 and 5, the support surfaces 83 and 8 of the fixed side template 31 are formed.
The step surface inside 5 is supported in contact with the step surfaces of the outer portions 87a and 89a of the secondary slide cores 87 and 89, and the lower surface of the fixed mold plate 31 is connected to the secondary slide cores 87 and 89.
The abutment 89 is in contact with and supported by the step surfaces of the inner portions 87b and 89b. At the same time, the sprue 79 of the sprue plate 63 communicates with the runner 81 of the fixed mold plate 31 and the fixed mold plate 31
The lower end of the runner 81 communicates with the upper ends of the integrated runners 87d and 89d of the secondary slide cores 87 and 89. Thereafter, the lower end of the secondary injection nozzle 77 is pressed against the nozzle contact surface 65b of the sprue plate 63, so that the sprue 79, the runner 81, and the runner 87 are discharged from the secondary injection nozzle 77.
Through d and 89d, the molten resin can be injected and injected into the secondary molding space. At the same time, the lower end of the runner lock pin 82 is exposed inside the runner 81, and is in a state where it can be joined to the solidified resin R at the time of injection molding.

In the injection step, an injection device (not shown)
The molten resin is injected and injected into the sprue 79 through the secondary side injection nozzle 77 through the runner 81 and the runners 87d and 87d.
The molten resin is filled into the secondary molding space formed by the secondary cavities 87c and 89c from the gate located at the lower end through 9d. Thereafter, when the resin is cooled and solidified, the protector 23 as a secondary molded product is integrally formed on the outer periphery of the concave portion 22a of the flange 22. At this time, the resin is also filled in the sprue 79 on the secondary side of the sprue plate 63 and the runner 81 on the secondary side of the fixed mold plate 31, and cooled and solidified.
Resin solids R having a shape corresponding to those are formed. The lower end of the runner lock pin 82 on the secondary side is
1 and is bonded to the solidified resin R at the time of injection molding.

In the injection step, the main core 35 as the primary core and the main cavity 31a as the primary cavity are separated from each other by a predetermined distance by the upper surfaces of the outer portions 87a and 89a as the support surfaces of the secondary slide cores 87 and 89. It is separated and held in the state where it was set. At this time, since the main core 35 as the primary core and the main cavity 31a as the primary cavity are provided with a predetermined draft, the surface of the base 21 as the primary molded product, particularly the corners thereof, Is separated from the main cavity 31a (particularly, a corner thereof) by a predetermined distance D, and does not come into contact with the main cavity 31a.

After the protector 23 is integrally formed on the flange 22, although not shown, in a mold opening step of the entire mold performed in the same manner as in FIG. Is separated from the fixed mold plate 31 and the mold is opened, and the runner plate 61 and the sprue plate 63 are fixed to the fixed mold plate 3.
1 and the sprue plate 63 and the runner plate 61 are further separated. In synchronization with this, the secondary slide core 8
7, 89, the secondary slide cores 87, 8
9 is slid horizontally in a direction away from the main core 35. As a result, the main core 35 and the push-up block 37 as the primary side core and the main cavity 31a forming the main part of the primary side cavity are opened, and the base 21 is opened.
A molded product obtained by integrally molding a protector 23 as a secondary molded product with a primary molded product composed of
Remain on top. Also, at this time, since the lower end of the runner lock pin 82 on the secondary side is joined to the solidified resin R in the runner 81, the solidified resin R in the runner 81 and the runners 87d and 89d joined to the lower end thereof are formed. The resin solidified material R is lifted following the runner lock pin 82 as the mold is opened, and is automatically cut off from the protector 23 as a secondary molded product on the main core 35 at the gates at the lower ends of the runners 87d and 89d. Is done.

It should be noted that the secondary slide cores 87 and 89 are not opened simultaneously with the mold opening operation of the movable mold plate 33. The mold opening operations of 87 and 89 may be performed. In this case, the runner 87 of the secondary slide cores 87, 89
Since the solidified resin R remains in d and 89d, the solidified resin R is removed manually or the like.

Thereafter, in the product take-out step shown in FIG. 6, the push-out drive means is driven to push the push-up block through the push rod 53, the push-up piece 49 and the push-out pin 39 against the urging force of the spring member 51. 37 is moved up from the molding position to the unloading position.
As a result, the molded product on the main core 35 is
, And can be removed upward from the main core 35 to take out the product.

As described above, the injection molding apparatus of the above embodiment is provided on one of the fixed mold plate 31 as the fixed main mold and the movable mold plate 33 as the movable main mold, and the base 21 as the primary molded product is provided. The base 21 and the flange 22 are provided on the other of the fixed-side mold plate 31 and the movable-side mold plate 33, and a main core 35 and a push-up block 37 as primary cores having engraved surfaces corresponding to one side surface of the flange 22. A main cavity 31a as a primary side cavity and an auxiliary, which have a die-sinking surface corresponding to the other side surface and are clamped with the main core 35 to form a primary molding space having the same shape as the shape of the base 21 and the flange 22. The cavity 33a, the main core 35, the main cavity 31a, and the auxiliary cavity 33a
And a mold corresponding to the shape of the primary side hydraulic cylinder 45 as the primary side driving means and the primary side hydraulic cylinder 45 for moving the molds relative to each other in the directions approaching and separating from each other, and the protector 23 as the secondary molded product. It has divided secondary cavities 87c and 89c of the carved surface, which are clamped to each other and have the same shape as the entire shape of the protector 23 as a whole,
Further, a pair of secondary slide cores 87, 89 forming a secondary molding space continuous with the primary molding space, and the secondary slide cores 87, 89 are connected to the main core 35, the main cavity 33a, and the auxiliary cavity. Secondary hydraulic cylinders 91 and 95 are provided as secondary drive means for moving the mold 33a in a direction different from the moving direction and clamping and opening the mold.

Accordingly, in the above embodiment, when the mold clamping device and the primary hydraulic cylinder 45 are driven to mold-clamp the main core 35, the main cavity 31a and the auxiliary cavity 33a, the shapes of the base 21 and the flange 22 are formed therebetween. A primary molding space having the same shape as the above is formed, and the primary molding can be performed. At this time, the secondary slide cores 87, 89
Is held in the mold open state so as not to interfere with the operation of the main cavity 31a by interfering with the main cavity 31a. After the primary molding, the mold clamping device and the primary hydraulic cylinder 45 are driven to open the main core 35, the main cavity 31a and the auxiliary cavity 33a, and then the secondary hydraulic cylinders 91 and 95 are driven to form a pair. The secondary slide cores 87 and 89 of the main cavity 35, the main cavity 31a and the auxiliary cavity 33a
When the mold is moved and moved in a direction different from the moving direction, a secondary molding space having the same shape as the entire shape of the protector 23 is formed therebetween, and secondary molding is enabled. At this time, the main core 35, the main cavity 31a, and the auxiliary cavity 33a are held in a mold-open state so as not to interfere with the secondary slide cores 87 and 89 to hinder the operation.
In this operation, the main cavity 31a for primary molding is used.
In addition, since the auxiliary cavity 33a and the secondary-side cavities 87c and 89c for secondary molding are provided completely separately, the shape of the secondary molded product such as the protector 23 depends on the shape of the primary molded product such as the base 21. There is no restriction. As a result, the degree of freedom of the shape of the final molded product can be increased. After the primary molding, the main core 35 and the main cavity 31 are formed.
a and the auxiliary cavity 33a are opened once,
Since the secondary molding is performed, even when burrs, which are resin solidified products R, occur on the primary molded product such as the base 21, such burrs are removed by the runner lock pins 75 and 82 when the mold is opened. As a result, the appearance quality of the molded article can be improved.

After the primary molding, the main core 35, the main cavity 31a and the auxiliary cavity 33a are opened, and
When the secondary slide cores 87, 89 are clamped, the main core 35, the main cavity 31a, and the auxiliary cavity 33a are separated and held by the support surfaces of the secondary slide cores 87, 89 while being separated by a predetermined distance. At this time, the main core 35
And the main cavity 31a have a predetermined draft, the surface of the primary molded product such as the base 21 is separated from the main cavity 31a (particularly at the corner thereof) and does not come into contact with the main cavity 31a. . As a result, there is no problem that the surface of the primary molded product such as the base 21 is damaged by contacting the corners of the main cavity 31a and the like, and the appearance quality of the molded product can be maintained satisfactorily.

Next, a second embodiment according to the present invention will be described below. In the second embodiment, only differences from the first embodiment will be described, and the same components as those in the first embodiment will be denoted by the same reference numerals in the drawings, and description thereof will be omitted.

FIG. 7 is a front sectional view showing a state where the injection molding apparatus of the second embodiment of the present invention is clamped to form a molding space for the base and the base is injection molded. FIG. 8 shows FIG.
FIG. 4 is a plan view showing a state in which a base slide core at a use position and a protector slide core at a standby position of the injection molding apparatus are viewed from above. FIG. 9 is a side sectional view of the injection molding apparatus of FIG. FIG. 10 is a cross-sectional view showing a state in which the mold of the injection molding apparatus of FIG. 7 is opened after injection molding of the base, and the base slide core is returned to the standby position.
FIG. 11 is a plan view showing the base slide core at the standby position and the protector slide core at the standby position in the injection molding apparatus of FIG. 10 when viewed from above. FIG.
FIG. 11 is a front sectional view showing a state in which the mold of the injection molding apparatus of FIG. 10 is again clamped, the slide core for the protector is moved to a use position, a molding space for the protector is formed, and the protector is injection molded. FIG. 13 is a plan view showing a state where the base slide core at the standby position and the protector slide core at the use position of the injection molding apparatus of FIG. 12 are viewed from above. FIG. 14 is a side sectional view of the injection molding apparatus of FIG. FIG. 15 is a cross-sectional view showing a state in which the injection molding apparatus of FIG. 14 is opened after the injection molding of the protector, and the protector slide core has returned to the standby position.

In the injection molding apparatus of the first embodiment, an auxiliary cavity 33a serving as a cavity of a concave portion 22a at the lower end of the flange 22 of the base 21 as a primary molded product is provided on a movable mold plate 33 constituting a movable main die. Together with the main core 3
5 is moved up and down by a hydraulic cylinder 45 to control the movement between the primary molding position and the secondary molding position, thereby switching between the primary molding space and the secondary molding space. As shown in FIGS. The injection molding apparatus of the embodiment is different from the first embodiment in that the primary slide cores 201 and 203 having the same configuration as the secondary slide cores 87 and 89 of the first embodiment are used to form the base 21 as a primary molded product. Of the recess 22a at the lower end of the flange 22 is formed.

That is, on the lower surface near one of the opposing side surfaces (the left side surface and the right side surface in FIG. 1) of the fixed side mold plate 31, a predetermined distance is provided on both sides of the main core 35, respectively.
Step-shaped support surfaces 183 and 185 are formed, and the support surface 1
The corresponding step-shaped primary side slide cores 201 and 203 are housed in close contact with each other on the lower surface of the fixed side template 31 inside the support surfaces 83 and 185 and the support surfaces 183 and 185, respectively. Each primary slide core 201 and 2
As shown in FIGS. 8 and 10, reference numeral 03 denotes outer portions 201a and 203a located outside on a predetermined height, and inner portions 201b and 201b located inside and a predetermined height smaller than the outside portions 201a and 203a. It is composed of The inner surfaces of the inner portions 201b, 201b are respectively provided with concave portions 2 at the lower end of a flange 22 which is a primary molded product of the injection molded product.
The primary side cavities 201c and 201c having a substantially semi-cylindrical shape corresponding to the circumferential half shape of 2a are formed so as to form a symmetrical shape. In the present embodiment, a first primary cavity is formed by the main cavity 31a of the fixed mold plate 31, and the primary cavities 201 of the primary slide cores 201 and 203 are formed.
A second primary side cavity is constituted by c and 201c, and thereby, a primary side cavity having the same shape as one entire side surface of the base 21 (entire upper surface, entire outer peripheral surface of the flange 22, and lower end surface of the flange 22) is constituted. . As a result, the fixed side mold plate 31 is closed at the mold clamping position shown in FIG.
Main cavity 31a, primary slide cores 201,
A primary molding space having the same shape as the shape of the base 21 is formed between the primary cavities 201c and 201c, the main core 35, and the push-up block 37.

Further, near the primary side cavities 201c, 203c of the inner portions 201b, 203b, runners 201d, 203d each having a substantially semi-cylindrical symmetrical shape are formed so as to extend substantially in the vertical direction. Inner part 20
1b and 203b are opened to the upper surface, and a gate (not shown) located at the lower end is connected to the primary side cavities 201c and 203.
c. The secondary hydraulic cylinders 9 for the secondary slide cores 87, 89 of the first embodiment.
Similarly to the relations 1, 95, primary-side hydraulic cylinders 91 and 95 are fixed to opposed side surfaces (the left side surface and the right side surface in FIG. 7) of the movable side mold plate 33, respectively. 96 is fixed to the outer side of the primary slide cores 201 and 203, and the secondary hydraulic cylinder 9
By controlling the drive of the primary slide cores 201 and 95 to cause the rams 92 and 96 to protrude and retract, respectively.
03 is controlled to move between a primary molding position shown in FIGS. 7 and 8 and a secondary molding position shown in FIGS. At the primary molding position, the fixed mold plate 31 does not intervene between the mating surfaces 201e and 201e, which are the inner end surfaces of the both primary slide cores 201 and 203,
The two mating surfaces 201e and 201e are tightly clamped, and the entire upper surfaces of the outer portions 201a and 201a contact the entire inner surfaces of the support surfaces 183 and 185, and the inner portion 2
01b and 203b are located at positions where the upper end surfaces abut the lower surface of the fixed mold plate 31. Then, at the primary molding position, the primary side cavity 2 of both the primary side slide cores 201 and 203 is located.
01c, 203c, flange 2 as a primary molded product
A primary molding space having a shape corresponding to the entire lower concave portion 22a of the lower part 2 is formed, and both runners 201d and 203d are integrated, and the upper end thereof is located at the lower end of the primary runner 73 on the fixed side mold plate 31. It is designed to communicate. In the secondary molding position, both primary slide cores 20
Mating surfaces 201e and 20 which are inner end surfaces of 1 and 203
1e, the fixed side template 31 is interposed, and the outer portions 201a,
The 203a and the inner portions 201b, 203b are in a non-contact state with the corresponding support surfaces 183, 185 or the lower surface of the fixed-side mold plate 31.

The main core 35 as the primary core and the main cavity 31a and the primary cavities 201c and 203c as the primary cavities are separated by the mold clamping device (not shown) and the primary hydraulic cylinders 91 and 95. A primary side driving means is configured to relatively move in a direction approaching and separating from each other and to clamp and open the mold. As described above, in this embodiment, the movable side mold plate 33 is provided by providing the primary side cavities 201c and 203c in the primary side slide cores 201 and 203 as the concave portions 22a of the flange 22.
Since the auxiliary cavity 33a is not required, the hydraulic cylinder 45 for vertically moving the main core 35 between the primary molding position and the secondary molding position is omitted. Further, for the same reason, the accommodation hole 13 of the movable mold plate 33 is formed.
3 is a lower portion of the guide portion 35a of the main core 35 and a flange 35b so as to hold the main core 35 at a fixed position so as not to move up and down.
The size and shape are substantially the same as those described above, and the back plate 41 is also omitted. Further, the spring member 51 is interposed between the main core 35 and the push-up piece 49. Further, as described above, the primary slide cores 201 and 203 have the primary side cavities 201c and 203c corresponding to the shape of the concave portion 22a of the flange 22 of the primary molded product by dividing the primary side cavities 201c and 203c. Tightened, along with the main cavity 31a,
A secondary molding space having the same shape as the overall shape of the secondary molded product and continuous with the primary molding space is formed.

Then, the first primary for clamping and opening the mold by moving the main core 35 as the primary core and the main cavity 31a as the primary cavity relatively upward and downward by the mold clamping device. Side drive means is configured. Further, the primary hydraulic cylinders 91 and 95 cause the pair of primary slide cores 201 and 95 to move.
The second primary side driving means is configured to move the mold 03 in a first horizontal direction different from the moving direction of the main core 35 as the primary side core and the main cavity 31a as the primary side cavity to clamp and open the mold. Have been.

On the other hand, on the other facing side (the left side and the right side in FIG. 9) of the fixed side mold plate 31, the secondary slide core 18 is located at a predetermined distance from both sides of the main core 35.
7 and 189 are respectively arranged. Each of the secondary slide cores 187 and 189 has primary slide cores 201 and 203 as shown in FIGS.
Of a predetermined height slightly higher than the height of the outer portions 201a and 203a, and the inner surface thereof corresponds to half the shape of the outer peripheral surface of the protector 23 which is a secondary molded product of the injection molded product. The secondary cavities 187c and 189c of the engraving surface having a substantially semi-cylindrical shape are formed to have a symmetrical shape. Further, the secondary slide core 187,
189, the secondary side cavities 187c, 189 inside
In the vicinity of c, a runner 18 having a symmetrical substantially semi-cylindrical shape is provided.
7d and 189d are formed so as to extend substantially vertically.
The upper end is opened to the inner upper surface, and the gate (not shown) located at the lower end is connected to the secondary side cavities 187c and 189.
c. In addition, the movable side mold plate 33
On the other opposite side surface (the left side surface and the right side surface in FIG. 9), the secondary hydraulic cylinders 91 and 95 having the same configuration as the primary hydraulic race wheels 91 and 95 are respectively attached to the bracket 9.
3 and 97, and the distal ends of the rams 92 and 96 are fixed to the outer sides of the secondary slide cores 187 and 189.

Thus, the secondary hydraulic cylinders 91, 9
5 is driven to cause the rams 92 and 96 to protrude and retract, and the secondary slide cores 187 and 189 are moved to the primary molding positions shown in FIGS. 8 and 9 and the secondary molding cores shown in FIGS. The movement is controlled between the position and the position. In the primary molding position, both secondary slide cores 18 are used.
Mating surfaces 187e and 18 which are the inner end surfaces of 7 and 189
The fixed-side template 31 is interposed between the fixed-side template 9e, the upper surface of which contacts the lower surface of the fixed-side template 31 and the mating surface 187e thereof.
And 189e are on both sides of the primary slide cores 201 and 203 in the primary molding position, and the main cavity 31
This is a position where it comes into substantially contact with the protruding portion extending downward around the periphery of “a”.
In the secondary molding position, both secondary slide cores 1
The mating surfaces 187e and 187 which are the inner end surfaces of 87 and 189
89e, the fixed side template 31 is not interposed,
The molds 7e and 189e are tightly clamped, and the upper surface thereof is at a position where the upper surface comes into contact with and supports a protrusion extending downward around the main cavity 31a. At the secondary molding position, a secondary molding space having a shape corresponding to the entire outer peripheral surface of the protector 23 as a secondary molded product is provided between the secondary cavities 187c and 189c of the both secondary slide cores 187 and 189. Are formed, and both runners 187d and 189d are integrated, and the upper end thereof is formed in the runner 181 of the fixed side mold plate 31.
Communicates with the lower end of the. The flow path of the runner 181 of the fixed mold plate 31 is different from that of the runner 81 of the first embodiment, and the lower ends of the runners 181 and 189 of the secondary slide cores are located at the mold clamping position and the secondary molding position. It communicates with the upper ends of the integrated runners 187d and 189d.

The secondary hydraulic cylinders 91 and 95
Accordingly, the vertical direction, which is the moving direction of the main core 35 as the primary core and the main cavity 31a as the primary cavity, is different from the first horizontal direction, which is the moving direction of the primary slide cores 201 and 203. Secondary driving means is configured to move the secondary slide cores 187, 189 toward and away from each other in the 22nd horizontal direction to clamp and open the mold. In the present embodiment, the first horizontal direction and the second horizontal direction are directions orthogonal to each other.

Further, the secondary slide cores 187, 1
As described above, 89 has divided secondary side cavities 187c and 189c of the engraved surface corresponding to the shape of the secondary molded product, and is clamped to each other to form an overall shape of the secondary molded product as a whole. And a secondary molding space which is continuous with the primary molding space.

Next, a description will be given of a molding method using the injection molding apparatus of the present embodiment configured as described above, together with the operation of the injection molding apparatus. The molding method described below is based on CP
The operation is performed according to a control program stored in the ROM in advance using known control means including U, ROM, RAM, and the like.

First, the primary molding step of injection molding the base 21 and the flange 23 as a primary molded product comprises a mold clamping step shown in FIG. 7, a mold opening step shown in FIG.

In the mold clamping step shown in FIG. 7, a mold clamping device (not shown) as first primary side driving means is driven to fix the movable side mold plate 33 integrated with the movable side attachment plate 43. The mold is clamped to the side mold plate 31. In addition, the extrusion drive means (not shown) is drive-controlled to set the lifting block 37 to the molding position. Before clamping the movable mold plate 33 to the fixed mold plate 31, the primary hydraulic cylinders 91 and 95 as the second primary drive means are driven to drive the pair of left and right primary slide cores 201. , 203 are moved in the first horizontal direction, which is a direction different from the vertical direction, which is the direction in which the main core 35 and the main cavity 31a are moved, and are clamped. That is, the rams 92 and 96 are projected, and the primary slide core 2
01 and 203 are slid along the upper surface of the movable mold plate 33, and the mating surfaces 201e and 203e are tightly clamped.
Then, when the movable mold plate 33 is clamped to the fixed mold plate 31, the semicircular lower portion of the inner portion of the primary slide cores 201 and 203 comes into close contact with the outer peripheral surface of the main core 35. To seal the primary slide core 201,
Primary-side cavities 201c and 203c, which form a semicircle on the upper side of the inner part of the core 203,
A part of a primary molding space having a shape corresponding to the shape of the concave portion 22a of the flange 22 is formed. Further, the main core 35 as the primary core and the lifting block 37 are clamped to the main cavity 31a as the primary cavity, and a primary molding space having the same shape as the primary molded product is formed therebetween, Primary molding becomes possible. At the same time, the runners 201d and 203d of the primary slide cores 201 and 203 are integrated, extend substantially in the vertical direction, and communicate the gate located at the lower end thereof from the primary cavities 201c and 203c to the primary molding space.

At this time, the secondary hydraulic cylinder 91
And 95 are driven to immerse the rams 92 and 96,
The secondary slide cores 187 and 189 are opened from the mold, that is, as shown in FIG.
The main mold cavity is held in a state of being separated outward from a downwardly extending protrusion around the main cavity or in a state of sliding at substantially the same position, and interferes with the fixed mold plate 31 to move with the fixed mold plate 31. The mold clamping operation with the side mold plate 33 is not hindered.

On the other hand, the mold clamping device is driven to place the runner plate 61 and the sprue plate 63 at predetermined positions on the fixed side mold plate 31, and the positioning protrusion 6 of the sprue plate 63
5 and 67 are closely fitted into the positioning recesses 61 a and 61 of the runner plate 61, and the sprues 71 and 79 of the sprue plate 63 are fitted.
Is communicated with the runners 73 and 181 of the fixed mold plate 31.
Then, the sprue 71 of the sprue plate 63 is connected to the runner 73 of the fixed mold plate 31 and the primary slide cores 201 and 20.
3 through the integrated runners 201d and 203d, the primary molding space communicates with the main cavity 31a and the primary cavities 201c and 203c. To the primary side injection nozzle 69
From the main cavity 31a and the primary side cavity 20 into the primary molding space via the sprue 71 and the runner 73.
The molten resin can be injected and injected from 1c and 203c. At the same time, the lower ends of the runner lock pins 75 and 82 are exposed in the corresponding runners 73 and 181 and are in a state where they can be joined to the solidified resin R at the time of injection molding.

At this time, in the example of FIG. 7, the secondary injection nozzle 77 is also brought close to the sprue plate 63 together with the primary injection nozzle 69 and pressed against the nozzle contact surface 65b. The secondary injection nozzle 77 does not need to be pressed against the nozzle contact surface 65b of the sprue plate 63 as shown in FIG. Therefore, the primary injection nozzle 69 and the secondary injection nozzle 77 are separately provided on the sprue plate 6.
3, the primary injection nozzle 69 at the time of primary molding, and the secondary injection nozzle 77 at the time of secondary molding.
Independently of the nozzle contact surfaces 65a, 65 of the sprue plate 63.
5b may be pressed.

In the injection step, an injection device (not shown)
, A molten resin is injected and injected into the sprue 71 through the primary side injection nozzle 69, and the runner 73 and the runner 201d,
The main cavity 31a and the primary cavities 201c,
c, The molten resin is filled in the primary molding space formed by the main core 35 and the push-up block 37. Thereafter, when the resin is cooled and solidified, the base 2 having the flange 22 integrally formed therein is formed.
The primary molded product consisting of 1 is molded in the primary molding space. At this time, the sprue 71 on the primary side of the sprue plate 63 and the runners 73d on the primary side of the fixed side mold plate 31 and the runners 201d and 203d of the primary side slide cores 201 and 203 are also filled with resin and cooled and solidified. A corresponding solidified resin R is formed. Since the lower end of the primary-side runner lock pin 75 is exposed in the runner 73, it is joined to the solidified resin R at the time of injection molding.

After the primary molding of the base 21 and the flange 22, in a mold opening step shown in FIG. 10, the mold clamping device is driven to separate the movable mold plate 33 from the fixed mold plate 31 and open the mold. , The runner plate 61 and the sprue plate 63 are separated from the fixed side mold plate 31, and the sprue plate 63 and the runner plate 61 are further separated. In synchronization with this, in the mold opening step of the primary slide cores 201, 203, the primary slide cores 201, 203 are slid in the horizontal direction while being separated from the main core 35. As a result, the main core 35 and the push-up block 37 serving as the primary core and the main cavity 31a constituting the main part of the primary cavity are opened, and the primary cavities 201c and 203c are opened.
Is opened, and a molded product obtained by integrally forming the protector 23 as a secondary molded product on the primary molded product composed of the base 21 and the flange 22 remains on the main core 35. At this time, since the lower end of the primary-side runner lock pin 75 is joined to the resin solidified material R in the runner 73, the resin solidified material R is lifted up following the runner lock pin 75 as the mold is opened, and its gate is opened. It is automatically cut off from the primary part in parts.

Next, the protector 23 as a secondary molded product
Is formed in the recess 22a at the lower end of the flange 22 by a mold clamping step shown in FIGS. 12 to 14, a mold opening step (not shown), and the like.

That is, after the primary molding, in the mold clamping process of the secondary slide cores 187 and 189 shown in FIGS. 12 to 14, first, the fixed mold plate 31 and the movable mold plate 33
While maintaining the mold open state shown in (1), the lifting block 37 is maintained at the molding position. Then, by driving secondary hydraulic cylinders 91 and 95 as secondary driving means, a pair of left and right secondary slide cores 187 and 189 are moved in a vertical direction which is a moving direction of the primary core and the primary cavity. And, the mold slides by moving in a second horizontal direction, which is a direction different from the first horizontal direction in which the primary slide cores 201, 203 move. That is, the rams 92 and 96 are projected, and the secondary slide cores 187 and 189 are moved to the movable mold plate 3.
3 slide along the upper surface, and the mating surfaces 187e, 189
Close the mold with e. Then, the semicircular lower end edge of the inner part of the secondary slide cores 187, 189 is
While sealing closely to the outer peripheral surface of the main core 35, the secondary side cavity 18 of the secondary side slide cores 187, 189 is also provided.
7c and 189c have a semicircular upper end edge which is
It is in close contact with the outer periphery of the upper end of the flange 22 of the upper primary molded product.
As a result, a secondary molding space having the same shape as the entire outer periphery of the protector 25 as a secondary molded product is formed between the secondary cavities 187c and 189c of the secondary slide cores 187 and 189. Secondary molding of the protector 23 on the outer periphery becomes possible. At the same time, the runners 187d and 189d of the secondary slide cores 187 and 189 are integrated, extend substantially vertically, and communicate the gate located at the lower end thereof from the secondary cavities 187c and 189c to the secondary molding space.

At this time, the movable mold plate 33 having the main core 35 as the primary core is kept open with respect to the fixed mold plate 31 having the main cavity 31a as the primary cavity. The side template 31 does not interfere with the moving secondary slide cores 187, 189 so as not to hinder its operation.

Thereafter, as a mold clamping step of the entire mold, the movable mold plate 33 is clamped to the fixed mold plate 31 by the mold clamping device, and the runner plate 61 and the sprue plate 63 are clamped.
Is placed at a predetermined position on the fixed mold plate 31, and the positioning projections 65 and 67 of the sprue plate 63 are closely fitted into the positioning recesses 61 a and 61 of the runner plate 61. Then, FIG.
As shown in the figure, the lower surface of the protruding portion extending downward around the main cavity 31a of the fixed side template 31 is
87 and 189 are abutted and supported on the upper surface. At the same time, the sprue 79 of the sprue plate 63 is
1 and the lower end of the runner 181 of the fixed mold plate 31 communicates with the upper ends of the integrated runners 187d and 189d of the secondary slide cores 187 and 189. Thereafter, the lower end of the secondary injection nozzle 77 is pressed against the nozzle contact surface 65b of the sprue plate 63, so that the sprue 79, the runner 181 and the runner 187d,
The molten resin can be injected and injected into the secondary molding space via 189d. At the same time, the lower end of the runner lock pin 82 is exposed inside the runner 181, and is in a state where it can be joined to the solidified resin R at the time of injection molding.

In the injection step, an injection device (not shown)
The molten resin is injected and injected into the sprue 79 through the secondary side injection nozzle 77 from the runner 181 and the runner 187.
The molten resin is filled into the secondary molding space formed by the secondary-side cavities 187c and 189c from the gate located at the lower end through the gates d and 189d. Thereafter, when the resin is cooled and solidified, the protector 23 as a secondary molded product is integrally formed on the outer periphery of the concave portion 22a of the flange 22. At this time, the resin is also filled in the sprue 79 on the secondary side of the sprue plate 63 and the runner 181 on the secondary side of the fixed mold plate 31, and cooled and solidified to form a solidified resin R having a shape corresponding to the resin. . Since the lower end of the runner lock pin 82 on the secondary side is exposed inside the runner 181, it is joined to the solidified resin R at the time of injection molding.

In the above-mentioned injection step, the main core 35 as the primary core and the main cavity 31a as the primary cavity are separated from each other by a predetermined distance by the upper surfaces as the support surfaces of the secondary slide cores 187, 189. Is done. At this time, since the main core 35 as the primary core and the main cavity 31a as the primary cavity are provided with a predetermined draft, the surface of the base 21 as the primary molded product, particularly the corners thereof, A predetermined distance D from the main cavity 31a (especially a corner thereof)
, And does not come into contact with the main cavity 31a.

After the protector 23 has been integrally formed on the flange 22, although not shown, in a mold opening step of the entire mold performed in the same manner as in FIG. Is separated from the fixed side mold plate 31 to open the mold, the runner plate 61 and the sprue plate 63 are separated from the fixed side mold plate 31, and the sprue plate 63 and the runner plate 61 are further separated.
And separated. In synchronization with this, the secondary slide core 1
87, 189, the secondary slide core 18
7 and 189 are slid in the horizontal direction away from the main core 35. As a result, the main core 35 and the push-up block 37 as the secondary side core and the main cavity 31a constituting the main part of the primary side cavity are opened, and the secondary molding is performed on the primary molded product including the base 21 and the flange 22. A molded product obtained by integrally forming the protector 23 as a molded product remains on the main core 35. At this time, since the lower end of the runner lock pin 82 on the secondary side is joined to the solidified resin R in the runner 181, the solidified resin R in the runner 181 and the runners 187d and 189d joined to the lower end thereof. The resin solidified material R is lifted following the runner lock pin 82 as the mold is opened, and is automatically cut off from the protector 23 as a secondary molded product on the main core 35 at the gates at the lower ends of the runners 187d and 189d. Is done.

It should be noted that the secondary slide cores 187 and 189 are not opened simultaneously with the mold opening operation of the movable mold plate 33. The mold opening operations of 187 and 189 may be performed. In this case, the solidified resin R remains in the runners 187d and 189d of the secondary slide cores 187 and 189, and the solidified resin R is manually removed.

Thereafter, in the product take-out step shown in FIG. 15, the extruding drive means is driven to push the urging force of the spring member 51 through the extruding rod 53, the push-up piece 49, and the extruding pin 39.
The lifting block 37 is moved upward from the molding position to the removal position. Thus, the molded product on the main core 35 follows the extrusion block 37 and separates upward from the main core 35, so that the product can be taken out.

As described above, the injection molding apparatus of the above embodiment is provided on one of the fixed mold plate 31 as the fixed mold and the movable mold plate 33 as the movable mold, and the base 21 and the flange as the primary molded product are provided. A main core 35 and a push-up block 37 as primary cores having a die-sinking surface corresponding to one side surface of the base 22 and the other of the fixed-side mold plate 31 and the movable-side mold plate 33 are provided. A first primary molding space having a die-sculpting surface corresponding to a part of the other side surface and having the same shape as one side surface and a part of the other side surface of the base 21 and the flange 22 when being clamped to the main core 35; Main cavity 3 as the first primary cavity forming
1a, and second primary side cavities 201c and 203c of a die-sinking surface corresponding to portions other than the above-mentioned part of the other side surface of the base 21 and the flange 22 are divided. A pair of primary slide cores 201 and 203 forming a second primary molding space having the same shape as a part other than the part on one side surface of the flange 22, and the main core 35 and the main cavity 31 a are approached and separated from each other. The first slide cores 201 and 203 are moved relative to the main core 35 and the main cavity 31a by a mold clamping device as a first primary side driving unit that relatively moves in the first direction to perform mold clamping and mold opening. Primary hydraulic cylinders 91 and 95 as second primary drive means for moving in a second direction different from the direction to clamp and open the mold, and a protector 2 as a secondary molded product And has secondary cavities 187c and 189c of a die-sculpting surface corresponding to the shape of the protector 23. The secondary cavities are mutually clamped to have the same shape as the entire shape of the protector 23 and to be continuous with the primary molding space. A pair of secondary slide cores 187 forming a secondary molding space,
189, and the secondary slide cores 187, 189,
Secondary hydraulic pressure as secondary drive means for clamping and opening the mold by moving in a third direction different from the moving direction of the main core 35 and the main cavity 31a and the moving direction of the primary slide cores 201 and 203. Cylinders 91 and 95 are provided.

Therefore, in the above embodiment, when the mold clamping device is driven to move the main core 35 and the main cavity 31a in the first direction to clamp the mold, the primary molded article such as the base 21 is interposed therebetween. A primary molding space having the same shape as the shape between the side surface and a part of the other side surface is formed. On the other hand, the primary hydraulic cylinders 91 and 95 are driven to drive the primary slide core 20.
When the molds 1, 203 are moved in the second direction and clamped, the main core 35, the main cavity 31a, the primary slide core 20
A primary molding space having the same shape as that of the primary molded product such as the base 21 is formed between the primary cavities 201c and 203c of the first and second cavities 1, 203, thereby enabling the primary molding. In addition,
At this time, the secondary slide cores 187 and 189 are held in the mold open state so that the secondary slide cores 187 and 189 do not interfere with the main core 35, the main cavity 31a, and the primary slide cores 201 and 203 so as not to hinder the operation. Then, after the primary molding, the mold clamping device is driven to open the main core 35 and the main cavity 31a, and the primary hydraulic cylinders 91 and 95 are driven to drive the primary cavities 2 of the primary slide cores 201 and 203.
After the molds 01c and 203c are opened, the secondary hydraulic cylinders 91 and 95 are driven to drive the secondary slide cores 187 and 1c.
When the mold 89 is moved in the third direction and clamped, a secondary molding space having the same shape as the overall shape of the secondary molded product including the protector is formed between them, and secondary molding is enabled.
At this time, the main core 35, the main cavity 31a, and the primary side slide cores 201, 203 are held in an open state, so that they do not interfere with the secondary side slide cores 187, 189 to prevent the operation thereof. In such an operation,
Primary cavity 31a and primary cavities 201c and 203c for primary molding and secondary cavity 1 for secondary molding
Since it is provided completely separately from the parts 87c and 189c, the shape of the secondary molded product such as the protector 23 is not limited by the relationship with the shape of the primary molded product such as the base 21. As a result, the degree of freedom of the shape of the final molded product can be increased. After the primary molding, the main core 35 and the main cavity 3
1a and the primary slide cores 201 and 203 are opened once, and then subjected to secondary molding. Therefore, even when burrs, which are resin solidified products R, occur on a primary molded product such as the base 21,
Such burrs are removed when the mold is opened. As a result, the appearance quality of the molded article can be improved.

As a result, in each of the above embodiments, the molding cycle is faster than the rotary mold, and the molding can be performed with one set of molds, so that the mold manufacturing cost is reduced. Further, since the cavity for secondary molding is not limited by the positional relationship of the core with respect to the cavity as in the core-back mold, the degree of freedom of the product shape is higher than that of the core-back mold. Further, since the cavity in the fixed main mold is not configured to slide, the present invention can be applied to a large product and a mold. In addition, since the primary molded product and the cavity are separated from each other at the time of secondary molding, there is no possibility that the product will be damaged at the time of re-clamping. Furthermore, since deburring after molding is performed reliably,
Unlike the technique disclosed in Japanese Patent Publication No. 5-35660, a configuration for preventing slippage is not required, and a special finish for that purpose is not required. In addition, since the mold is opened at the time of the primary molding and the secondary molding, it is possible to avoid the operation of the apparatus under the high pressure mold clamping as in the related art, and to reduce the mold clamping pressure as disclosed in Japanese Patent Publication No. 5-49448. No need to adjust.

By the way, the slide core 8 of each of the above embodiments is used.
7, 89, 187, 189, 201, and 203 are configured to move in the horizontal direction corresponding to the sides of the mold, but the present invention is not limited to this. Any device may be used as long as it approaches and separates from the molding space from a direction different from the moving direction of the movable main mold by the mold clamping device. In addition, the primary slide core 201 of the second embodiment,
The 203 and the secondary slide cores 187 and 189 may be configured to move in a horizontal direction orthogonal to each other, or may be configured to move in different directions.

The shape, type, etc., of each component of the mold of the above embodiment are also appropriately selected according to the type, etc. of the molded product.

[0098]

As described above, in the injection molding apparatus according to the first aspect of the present invention, when the primary drive means is driven to clamp the primary core and the primary cavity, the primary molded product is interposed between them. A primary molding space having the same shape as the shape is formed, and primary molding can be performed. At this time, the secondary slide core is held in the mold open state, so that the secondary slide core does not interfere with the primary core or the primary cavity to hinder its operation. Further, after the primary molding, the primary side driving means is driven to open the primary side core and the primary side cavity, and then, the secondary side driving means is driven, and the plurality of secondary side sliding cores are connected to the primary side core. When the mold is moved in a direction different from the moving direction of the primary cavity and the mold is clamped, a secondary molding space having the same shape as the overall shape of the secondary molded product is formed therebetween, and secondary molding is enabled. At this time, the primary side core and the primary side cavity are held in the mold open state so as not to interfere with the secondary side slide core and hinder its operation. In this operation, since the primary side cavity for the primary molding and the secondary side cavity for the secondary molding are provided completely separately, the shape of the secondary molded product is limited by the relationship with the shape of the primary molded product. There is no. As a result, the degree of freedom of the shape of the final molded product can be increased. In addition, after the primary molding, the primary core and the primary cavity are temporarily opened, and then the secondary molding is performed. Therefore, even if burrs are formed on the primary molded product, the burrs are removed when the mold is opened. As a result, the appearance quality of the molded article can be improved.

The injection molding apparatus according to the second aspect of the present invention
When the primary-side driving means is driven to mold-clamp the primary-side core and the primary-side cavity, a primary molding space having the same shape as that of the primary molded product is formed therebetween, thereby enabling primary molding. At this time, the secondary slide core is held in the mold open state, so that the secondary slide core does not interfere with the primary core or the primary cavity to hinder its operation. Also, after primary molding,
After driving the primary driving means to open the primary core and the primary cavity, the secondary driving means is driven to move the plurality of secondary slide cores to move the primary core and the primary cavity. When the mold is moved in a direction different from the direction and the mold is clamped, a secondary molding space having the same shape as the entire shape of the secondary molded product is formed therebetween, and secondary molding is enabled. In addition,
At this time, the primary side core and the primary side cavity are kept in the mold open state so as not to interfere with the secondary side slide core to hinder its operation. In this operation, since the primary side cavity for the primary molding and the secondary side cavity for the secondary molding are provided completely separately, the shape of the secondary molded product is limited by the relationship with the shape of the primary molded product. There is no. As a result, the degree of freedom of the shape of the final molded product can be increased. In addition, after the primary molding, the primary core and the primary cavity are temporarily opened, and then the secondary molding is performed. Therefore, even if burrs are formed on the primary molded product, the burrs are removed when the mold is opened. As a result, the appearance quality of the molded article can be improved.

An injection molding apparatus according to a third aspect of the present invention
In the invention of claim 2, a predetermined draft is provided in the primary core and the primary cavity, and at least one of the primary core and the primary cavity is applied to the secondary slide core at the time of mold clamping. A support surface is provided for contacting and supporting the primary core and the primary cavity in a state of being separated by a predetermined distance.

Therefore, after the primary molding, the primary side core and the primary side cavity are opened, and a plurality of secondary side slide cores are clamped. As a result, the primary side core and the primary side cavity are supported by the support surface of the secondary side slide core. As a result, they are separated and held in a state of being separated by a predetermined distance. At this time, since a predetermined draft is provided in the primary core and the primary cavity, the surface of the primary molded product is in a state of being separated from the primary core or the primary cavity (particularly, corners thereof), and There is no contact with the core or the primary cavity. As a result, there is no problem such as the surface of the primary molded article being in contact with the primary core or the corner of the primary cavity and being damaged, and the appearance quality of the molded article can be maintained satisfactorily.

An injection molding apparatus according to a fourth aspect of the present invention
When the first primary side driving means is driven to move the primary side core and the first primary side cavity in the first direction and clamp the mold,
A primary molding space having the same shape as that between one side of the primary molded product and a part of the other side is formed between them. on the other hand,
When the second primary driving means is driven to move the plurality of primary slide cores in the second direction and clamp the mold, the second core of the primary core, the first primary cavity, and the plurality of primary slide cores is moved. A primary molding space having the same shape as that of the primary molded product is formed between the primary molding cavity and the primary cavity, thereby enabling primary molding. At this time, the secondary slide core is held in the mold open state, so that the secondary slide core does not interfere with the primary core, the first primary cavity, and the primary slide core to interfere with the operation thereof. Then, after the primary molding, the first primary side driving unit is driven to open the mold of the primary side core and the first primary side cavity, and the second primary side driving unit is driven to drive the first side of the primary slide core. After opening the primary side cavity of the second, the secondary side driving means is driven to move the plurality of secondary side slide cores in the third direction to clamp the secondary side slide cores. A secondary molding space having the same shape as the entire shape is formed, and secondary molding can be performed. At this time, the primary side core, the first primary side cavity, and the primary side slide core are held in the mold open state so as not to interfere with the secondary side slide core to hinder the operation. In such an operation, the first and second primary cavities for the primary molding and the secondary cavities for the secondary molding are provided completely separately, so that the shape of the secondary molded product is different from the shape of the primary molded product. You are not restricted by relationship. As a result, the degree of freedom of the shape of the final molded product can be increased. In addition, after the primary molding, the primary core, the first primary cavity, and the primary slide core are opened once, and then the secondary molding is performed. Removed when opening the mold. As a result, the appearance quality of the molded article can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which a molding space for a base is formed by clamping a mold of an injection molding apparatus according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a state where a slide core at a standby position of the injection molding apparatus of FIG. 1 is viewed from above.

FIG. 3 is a sectional view showing a state in which the injection molding apparatus of FIG. 1 is opened after injection molding of a base and a slide core is moved to a use position.

FIG. 4 shows the injection molding apparatus of FIG.
It is sectional drawing of the front which shows the state which formed the molding space for the protector and injection-molded the protector.

FIG. 5 is a side sectional view of the injection molding apparatus of FIG. 4;

FIG. 6 is a cross-sectional view showing a state in which the injection molding apparatus of FIG. 4 is opened after the injection molding of the protector and the slide core is returned to a standby position.

FIG. 7 is a front sectional view showing a state where the injection molding apparatus according to the second embodiment of the present invention is clamped to form a molding space for the base and the base is injection molded.

8 is a plan view showing the base slide core at the use position and the protector slide core at the standby position of the injection molding apparatus of FIG. 7 as viewed from above.

FIG. 9 is a sectional side view of the injection molding apparatus of FIG. 7;

10 is a cross-sectional view showing a state in which the injection molding apparatus of FIG. 7 is opened after injection molding of the base and the base slide core is returned to the standby position.

11 is a plan view showing the base slide core at the standby position and the protector slide core at the standby position of the injection molding apparatus of FIG. 10 when viewed from above.

FIG. 12 is a front view showing a state in which the injection molding apparatus of FIG. 10 is re-clamped, the slide core for the protector is moved to a use position, a molding space for the protector is formed, and the protector is injection molded. FIG.

FIG. 13 is a plan view showing a state in which a base slide core at a standby position and a protector slide core at a use position of the injection molding apparatus of FIG. 12 are viewed from above.

FIG. 14 is a side sectional view of the injection molding apparatus shown in FIG. 12;

FIG. 15 is a cross-sectional view showing a state in which the mold of the injection molding apparatus of FIG. 14 is opened after the injection molding of the protector, and the protector slide core has returned to the standby position.

FIG. 16 is a perspective view showing a resin molded product manufactured by the injection molding apparatus according to one embodiment of the present invention.

FIG. 17 is a sectional view showing a resin molded product manufactured by the injection molding apparatus according to one embodiment of the present invention.

[Explanation of symbols]

 31 Fixed-side template (fixed main mold) 33 Movable-side template (movable main mold) 35 Main core (primary core) 37 Push-up block (primary core) 31a Main cavity (primary cavity) 33a Auxiliary cavity (primary side) Cavity) 45 Primary hydraulic cylinder (primary drive means) 87 Secondary slide core 89 Secondary slide core 91 Secondary hydraulic cylinder (secondary drive means) 95 Secondary hydraulic cylinder (secondary drive means) ) 91 Primary hydraulic cylinder (primary drive means) 95 Primary hydraulic cylinder (primary drive means) 187 Secondary slide core 187c Secondary cavity 189 Secondary slide core 189c Secondary cavity 201 Primary slide core 201c Primary cavity 203 Primary slide core 203c Primary cavity

Claims (4)

(57) [Claims] 1. A primary core having an engraved surface corresponding to one side surface of a primary molded product, and a primary core having a die engraved surface corresponding to the other side surface of the primary molded product. A primary cavity that forms a primary molding space having the same shape as the shape of a molded product; and a primary drive unit that relatively moves the primary core and the primary cavity in a direction to approach and separate from each other to clamp and open the mold. Having a secondary side cavity of a die-sinking surface corresponding to the shape of the secondary molded product, having the same shape as the overall shape of the secondary molded product as a whole and being clamped together, and A plurality of secondary slide cores forming a secondary molding space continuous with the molding space, and the plurality of secondary slide cores are moved in a direction different from a moving direction of the primary core and the primary cavity to form a mold. Tightening and opening the mold Injection molding apparatus characterized by comprising a side drive means. 2. A primary core provided on one of a fixed main die and a movable main die and having a die engraving surface corresponding to one side surface of a primary molded product; and a primary core provided on the other of the fixed main die and the movable main die. A primary cavity having a die-sinking surface corresponding to the other side surface of the primary molded product, and being clamped to the primary core to form a primary molding space having the same shape as the primary molded product; and the primary core. And the primary cavity are relatively moved in the direction of approaching and separating from each other, the primary driving means for clamping and opening the mold, and the secondary cavity of the die-cutting surface corresponding to the shape of the secondary molded product is divided. A plurality of secondary slide cores having a same shape as the overall shape of the secondary molded product as a whole and being clamped to each other, and forming a secondary molding space continuous with the primary molding space; Of the secondary slide core of the primary side Injection molding apparatus characterized by comprising a mold clamping and mold opening to the secondary side drive means to move in a direction different from the moving direction of A and the primary cavity. 3. The primary core and the primary cavity have a predetermined draft angle, and the secondary slide core abuts at least one of the primary core and the primary cavity when the mold is clamped. The injection molding apparatus according to claim 2, further comprising a support surface that supports and holds the primary core and the primary cavity in a state of being separated by a predetermined distance. 4. A primary core provided on one of a fixed mold and a movable mold and having an engraved surface corresponding to one side surface of the primary molded article; and the primary molded article provided on the other of the fixed mold and the movable mold. Having a first engraving surface corresponding to a part of the other side surface, and being clamped with the primary side core to form a first primary molding space having the same shape as one side surface of the primary molded product and a part of the other side surface. The first to form
And a second primary cavity of a die-sinking surface corresponding to a part other than the part on the other side of the primary molded product. A plurality of primary slide cores forming a second primary molding space having the same shape as a part other than the part of the side surface; and a first direction in which the primary core and the primary cavity approach and separate from each other in a first direction. A first primary side driving unit that moves to close and open the mold, and moves the plurality of primary side slide cores in a second direction different from the moving direction of the primary side core and the primary side cavity to close the mold. And a second primary side driving means for opening the mold, and having a secondary side cavity of a die engraving surface corresponding to the shape of the secondary molded product divided, and clamped to each other to form the secondary molded product as a whole. The same shape as the whole shape, and A plurality of secondary slide cores forming a secondary molding space continuous with the primary molding space; and a plurality of the secondary slide cores, moving directions of the primary core and the first primary cavity and the primary side. An injection molding apparatus comprising: a secondary-side driving unit that moves in a third direction different from the moving direction of the slide core to clamp and open the mold.