JPH07290505A - Injection molding device - Google Patents

Abstract

PURPOSE:To heighten degree of freedom of a shape of a product, improve appearance quality, shorten a molding cycle, and apply to upsizing by letting slide cores approach and separate in a direction different from a mold clamping direction of a mold so as to form a cavity for secondary molding. CONSTITUTION:A primary cavity 33a comprises a primary core 35 of a primary molded piece and a die face of the primary molded piece and forms a primary molding space having the same shape as that of the primary core 35 and the primary molded piece. A primary driving means 45 is provided for moving the primary core 35 and the primary cavity 33a in approaching and separating directions so as to perform mold clamping and mold opening. A secondary cavity which corresponds to a secondary molded piece is provided being divided. Secondary slide cores 87 and 89 have the same shape as the entire shape of the secondary molded piece as a whole and form a secondary molding space to be connected to the primary molding space. Secondary driving means 91 and 95 perform mold clamping and mold opening by moving the slide cores in a direction different from the moving direction of the primary core 35 and the primary cavity 33a.

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 improvement of an injection molding die for multicolor molding including dissimilar material molding using a slide core.

[0002]

2. Description of the Related Art Conventional injection molding apparatuses for this kind of multicolor molding are disclosed in Japanese Patent Laid-Open Nos. 52-70195 and 52.
The technology described in JP-A-12267 or JP-A-57-19933 can be mentioned.

These disclose a core back type injection molding die having a set of a fixed die and a movable die. 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 the direction of approaching and separating from the cavity. Then, the slide core is brought close to the cavity and placed in a molding space having the same shape as the final molded product between the cavity and the core to form a molding space for the primary molding having a shape excluding the slide core portion, and then the primary injection is performed. Perform molding. Further, without opening the parting surface between the cavity and the core, the slide core is separated from the cavity, and an opening-shaped molding space for secondary molding is formed in the primary molded product formed between the cavity and the core. Then, secondary injection molding is performed to obtain a multicolor molded product having a secondary molded product as a part of the primary molded product.

Further, as a conventional injection molding apparatus for this kind of multicolor molding, Japanese Patent Publication No.
The technology disclosed in Japanese Patent No. 8657 or Japanese Patent Publication No. 5-3808 can be mentioned.

These disclose a rotary type 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, the fixed mold is rotated so that the fixed mold primary molding cavity and the secondary molding cavity are selectively opposed to the movable mold core, and the primary injection molding and the secondary injection molding are sequentially performed. I have to.

As a conventional injection molding apparatus for multicolor molding of this type, there is a mold insertion slide type injection molding die. In this technique, a fixed mold is provided with a cavity for primary molding and a cavity for secondary molding, and a movable mold is provided with an insert forming a core commonly used for primary molding and secondary molding. The child is slid from the fixed type primary molding cavity to the secondary molding cavity, and primary injection molding and secondary injection molding are performed sequentially.

[0007]

Since the conventional core-back type injection molding die is constructed as described above, the construction for the core-back is simple and the product cost of the die is low. It is possible to switch from primary molding to 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 this injection molding die shares a cavity during primary molding and secondary molding, it is necessary to position the molding space for secondary molding by moving the slide core within the molding space for primary molding. Since the position is limited, there are restrictions on the product shape of the multicolor molded product. 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. Further, 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. As a result, burrs may occur on the secondary molded product.

Incidentally, Japanese Patent Publication No. 5-49448 discloses that
In the core-back type injection molding die, a technique for securing and improving the operating state (particularly the returning state) of the core is disclosed, but this technique also has a limitation in the product shape,
Also, burrs may occur on the secondary molded product.

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

However, the rotary injection molding die disclosed in Japanese Patent Publication No. 5-35660 can properly remove burrs generated in the primary molding when the rotary die is rotated after the primary molding.
Further, although there are few restrictions on the product shape, the product cost of the mold is higher than that of the core-back type injection molding mold, and the molding cycle is also delayed.

Therefore, the technique disclosed in Japanese Patent Publication No. 1-38657 or Japanese Patent Publication No. 5-3808 is also
Although it has the same advantages as the technique disclosed in Japanese Examined Patent Publication (Kokoku) No. 5-35660, the product cost of the mold is higher than that of the core-back type injection molding mold, and the molding cycle may be delayed.

Further, the mold insert slide type injection molding mold has an intermediate feature between the core back mold and the rotary mold, and has the advantages of both, but the above-mentioned improvement points. Can be said to remain. Further, since a primary molded product and a secondary molded product are obtained by combining a single insert as a core and two cavities, the size of the molded product depends on the size of the core insert. Since the slide mechanism is used to slide and perform primary molding and secondary molding continuously, there is a limit to the size of the insert, and it is not suitable for a mold for a large product.

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

Further, the technique disclosed in Japanese Examined Patent Publication No. 5-35660 discloses a rotary die, but
Compared with the core-back type injection mold, the product cost of the mold is high, and the molding cycle is slow. Further, when the primary molded product has a protrusion-shaped rising portion, a special configuration is required to prevent the rising portion from falling inward due to contraction of the primary molded product after the primary molding.

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

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

Therefore, according to the present invention, the degree of freedom in the shape of the product can be increased, the burrs of the molded product can be surely cut off to improve the appearance quality, and the product cost of the mold can be reduced. An object of the present invention is to provide an injection molding apparatus that can be maintained at a low level, can accelerate a molding cycle, and can also be applied as a mold for a large product.

[0018]

SUMMARY OF THE INVENTION An injection molding apparatus according to the invention of claim 1 has a primary core having a die-cut surface corresponding to one side surface of a primary molded product and a mold corresponding to the other side surface of the primary molded product. The primary side cavity having a carved surface and forming a primary molding space having the same shape as the shape of the primary molded product by being clamped with the primary side core, and the primary side core and the primary side cavity are moved toward and away from each other. Has a primary-side driving means that relatively moves in the direction to clamp and open the mold, and a secondary-side cavity of a carved surface corresponding to the shape of the secondary molded product, which are clamped to each other as a whole. A plurality of secondary-side slide cores having the same shape as the overall shape of the secondary-molded product and forming a secondary-molding space that is continuous with the primary-molding space, and the plurality of secondary-side slide cores, Transfer of core and primary cavity Comprising a secondary drive means for opening mold clamping and mold moves in a direction different from directions.

The injection molding apparatus according to the invention of claim 2 is
A primary core provided on one of the fixed main mold and the movable main mold and having a die-cut surface corresponding to one side surface of the primary molded product, and on the other of the fixed main mold and the movable main mold, other than the primary molded product. A primary side cavity having a die-sinking surface corresponding to a side surface, which is clamped with the primary side core to form a primary molding space having the same shape as the shape of the primary molded article; and the primary side core and the primary side cavity. Have a primary side driving means for relatively moving in a direction toward and away from each other to clamp and open the mold, and a secondary side cavity of a carved surface corresponding to the shape of the secondary molded product. A plurality of secondary side slide cores that are tightened to form a secondary molding space that is the same as the overall shape of the secondary molding product and that is continuous with the primary molding space, and the plurality of secondary slides. The core is replaced with the primary side core and the primary side 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.

The injection molding apparatus according to the invention of claim 3 is
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 when the die is clamped. A supporting surface is provided that holds the primary core and the primary cavity in close contact with each other by a predetermined distance.

The injection molding apparatus according to the invention of claim 4 is
A primary core provided on one of the fixed mold and the movable mold and having a die-cutting surface corresponding to one side surface of the primary molded product, and one of the other side surfaces of the primary molded product provided on the other of the fixed mold and the movable mold. A first molding space having a die-sinking surface corresponding to a part and being clamped to the primary core to form a first primary molding space having the same shape as a part of one side surface and the other side surface of the primary molded product. A primary side cavity and a second side cavity on the other side of the primary molded product corresponding to a portion other than the part of the primary side of the primary molded product are separately provided, and one side of the primary molded product is clamped to each other. A plurality of primary side slide cores that form a second primary molding space having the same shape as the portion other than the above part, and a first side core and a primary side cavity that approach and separate from each other.
The first primary side driving means for relatively moving in the direction of and clamping and opening the mold, and 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. The second primary side driving means for clamping and opening the mold and the secondary side cavity of the mold engraving surface corresponding to the shape of the secondary molded product are separately provided, and the mold is clamped to each other as a whole. A plurality of secondary side slide cores having the same shape as the overall shape of the next molded product and forming a secondary molding space continuous to the primary molding space, and the plurality of secondary side slide cores, 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]

In the invention of claim 1, 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 shape of the primary molded product is formed between them. , Primary molding becomes possible. At this time, the secondary side slide core is held in the mold open state so as not to interfere with the operation by interfering with the primary side core or the primary side cavity. 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 to move the plurality of secondary side slide cores to the primary side core. Also, when the mold is clamped by moving in a direction different from the moving direction of the primary side cavity, a secondary molding space having the same shape as the overall shape of the secondary molded product is formed between them, and the secondary molding becomes possible. 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 operation by interfering with the secondary side slide core. In such an operation, since the primary cavity for primary molding and the secondary cavity for secondary molding are provided completely separately, the shape of the secondary molded article is limited in relation to the shape of the primary molded article. There is no. As a result, the degree of freedom of the shape of the final molded product can be increased. Further, after the primary molding, the primary side core and the primary side cavity are once opened, and then the secondary molding is performed. Therefore, even if burrs are generated in the primary molded product, such burrs are removed when the mold is opened. As a result, the appearance quality of the molded product can be improved.

In the invention of claim 2, 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 shape of the primary molded product is formed between them. , Primary molding becomes possible. At this time, the secondary side slide core is held in the mold open state so as not to interfere with the operation by interfering with the primary side core or the primary side cavity. 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 to move the plurality of secondary side slide cores to the primary side core. Also, when the mold is clamped by moving in a direction different from the moving direction of the primary side cavity, a secondary molding space having the same shape as the overall shape of the secondary molded product is formed between them, and the secondary molding becomes possible. 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 operation by interfering with the secondary side slide core. In such an operation, since the primary cavity for primary molding and the secondary cavity for secondary molding are provided completely separately, the shape of the secondary molded article is limited in relation to the shape of the primary molded article. There is no. As a result, the degree of freedom of the shape of the final molded product can be increased. Further, after the primary molding, the primary side core and the primary side cavity are once opened, and then the secondary molding is performed. Therefore, even if burrs are generated in the primary molded product, such burrs are removed when the mold is opened. As a result, the appearance quality of the molded product can be improved.

According to the third aspect of the invention, after the primary molding, the primary side core and the primary side cavity are opened, and the plurality of secondary side slide cores are clamped. The support surfaces of the side slide cores are separated and held at a predetermined distance. At this time,
Since the primary core and the primary cavity are provided with a predetermined draft, the surface of the primary molded product is in a state of being separated from the primary core or the primary cavity (particularly their corners), and the primary core or the primary cavity. There is no contact with the side cavity. As a result, there is no problem that the surface of the primary molded product comes into contact with the corners or the like of the primary side core or the primary side cavity and is scratched, and the appearance quality of the molded product can be maintained in good condition.

In the invention of claim 4, 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 clamping is performed, the primary side is provided 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 side drive means is driven to move the plurality of primary side slide cores in the second direction and mold clamping is performed, the primary side core, the first primary side cavity and the plurality of primary side slide cores are A primary molding space having the same shape as the shape of the primary molded product is formed between the second primary side cavity and the primary molding is possible. At this time, the secondary side slide core is held in the mold open state so as not to interfere with the operation by interfering with the primary side core, the first primary side cavity and the primary side slide core.
Then, after the primary molding, the first primary side driving means is driven to open the primary side core and the first primary side cavity, and the second primary side driving means is driven to drive the first primary side slide core. After opening the primary side cavity 2 of the second mold, the secondary side drive means is driven to move the plurality of secondary side slide cores to the third side.
When the mold is clamped by moving in the direction of, a secondary molding space having the same shape as the overall shape of the secondary molded product is formed between them, and the secondary molding becomes possible. 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 operation by interfering with the secondary side slide core. In such an operation, the first and second primary-side cavities for primary molding and the secondary-side cavities for secondary molding are provided separately from each other, so that the shape of the secondary molded article is different from that of the primary molded article. You are not limited by relationships. As a result, the degree of freedom of the shape of the final molded product can be increased. Further, after the primary molding, the primary core, the first primary cavity, and the primary slide core are once opened, and then the secondary molding is performed. It is removed when the mold is opened. As a result, the appearance quality of the molded product can be improved.

[0026]

EXAMPLES Examples of the present invention will be described below. The injection molding apparatus of the present invention is an application of the ideas 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, the injection-molded product is exemplified by an electric polisher for waxing automobiles shown in FIGS. 16 and 17. First, the 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 the embodiment of the present invention. Figure 1
FIG. 7 is a sectional view showing a resin molded product manufactured by the injection molding apparatus according to the embodiment of the present invention.

In the figure, the injection molded product is a base 21.
And a protector 23 and a sponge 25. The base 21 is made of a hard resin or the like and has one side surface (lower surface in the figure).
It has a disk shape having a flange 22 extending downward on the outer circumference, and a connecting projection 21a is projected upward at the center of the other side surface (upper surface in the drawing) to drive a motor drive shaft (not shown) of the main body of the electric polisher. It can be connected to. A recess 22a is continuously formed in the circumferential direction (for example, over the entire circumference or in a part of the circumferential direction) on the lower side of the outer peripheral surface of the flange 22 of the base 21. The protector 23 is made of a soft resin or the like, and is integrally formed continuously (preferably over the entire circumference or part of the circumference) of the outer peripheral surface of the flange 22 of the base 21. Protector 23
Extends from a predetermined distance above the recess 22a of the flange 22 to a predetermined distance below the lower end of the flange 22. The 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. In addition, inside the integrally molded base 21 and protector 23, a sponge 25 made of foamed resin or the like is separately molded and fixed in a later step,
It constitutes an electric polisher as the final product.

Next, the injection molding apparatus according to the first embodiment will be described with reference to the injection molding die.

FIG. 1 is a cross-sectional view showing a state in which the injection molding apparatus of the first embodiment of the present invention is clamped to form a molding space for a base. FIG. 2 is a plan view showing a state in which the slide core in the standby position of the injection molding apparatus of FIG. 1 is viewed from above, and schematically shows the relationship between the main core and the slide core. FIG. 3 is a cross-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 the use position. FIG. 4 is a front sectional view showing a state in which the protector is injection-molded by forming the molding space for the protector again by clamping the injection-molding apparatus of FIG. FIG. 5 is FIG.
FIG. 3 is a side sectional view of the injection molding apparatus of FIG. FIG. 6 is a sectional view showing a state in which the injection molding apparatus of FIG. 4 is opened after 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 fixed side mold plate 31 forming a fixed main mold is provided with a main cavity 31a forming a primary side cavity.
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 of the outer peripheral surface of the flange 22 excluding the recess 22a). Further, 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 portion of the central portion of the movable side mold plate 33 which constitutes the movable main mold, the portion facing the main cavity 31a. The guide hole 3 is formed on the upper surface of the movable mold plate 33.
Along the outer circumference 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 recess 22a below the flange 22 of the base 21. The auxiliary cavity 33b of the movable side mold plate 33, together with the main cavity 31a, constitutes a primary side cavity having the same shape as the entire one side surface of the base 21 (the entire upper surface and the entire outer peripheral surface of the flange 22 and the lower end surface of the flange 22). The movable mold plate 33 is provided with a housing hole 33c having a diameter larger than that of the guide hole 33a and extending downward from the guide hole 33a, and a stepped regulation surface 33d is formed by the upper surface of the housing hole 33c.
Is configured. The guide hole 33a and the accommodation hole 33c pass through the movable side mold plate 33 in the thickness direction.

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

An insertion hole 35c having a substantially T-shaped cross section is provided 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 of the upper portion of the insertion hole 35c is inserted into the large-diameter portion of the upper portion of the insertion hole 35c of the main core 35 from above. In addition, the small diameter portion below the large diameter portion of the insertion hole 35c integrally extends downward from the lower end of the push-up block 37, and has the same cross-sectional shape as the small diameter portion of the insertion hole 35c. Has been inserted. The push-up block 37 and the push pin 39 are slidable vertically along the insertion hole 35c, and the push-up block 37 protrudes upward from the insertion hole 35c as shown in FIG. And the insertion hole 35 as shown in FIG.
It is movable between a position returned to c (hereinafter, referred to as a molding position). In detail, the push-up block 37 has a flat surface corresponding to the plane circular main core 35, for example, a circular shape having a small diameter, and an upper portion thereof having a disc shape and a lower portion. From the viewpoint of smoothing the sliding operation and the like, it is preferable that the portion has a cone shape in which the diameter is reduced downward, and the extrusion pin 39 also has a cylindrical shape with a smaller diameter. 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 the push-up block 37 is returned to the insertion hole 35c. With this, when the main core 35 is in the primary molding position and the push-up block 37 is in 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 engraving surface as the lower surface of the base 21. Further, together with the upper surface and the outer peripheral surface of the upper end portion of the main core 35, a stamped 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 the primary core of the die-cut surface corresponding to the other side surface of the base 21. As a result, at the mold clamping position shown in FIG.
A primary molding space having the same shape as that of the base 21 is formed between 1a, the auxiliary cavity 33b of the movable side 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 mold and the movable main mold, and may have a carved surface corresponding to one side surface of the primary molded product, and the main cavity 3
1a is provided on the other of the fixed main mold and the movable main mold, has a die-sinking surface corresponding to the other side surface of the primary molded product, and has the same shape as the shape of the primary molded product when clamped with the main core 35. It may be configured so as to form the primary molding space.

The movable side mold plate 33 is fixed to a movable side mounting plate 43 via a back plate 41, and the movable side mold plate 33,
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.

Inside the central portion of the back plate 41, a primary side hydraulic cylinder 45 as a drive means for primary molding is arranged. The primary side hydraulic cylinder 45 is fixed to the back plate 41 at a portion indicated by an arrow in FIG. 1 by screwing 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 externally fitted to the push pin 39 so as to be slidable in the axial direction. As shown in FIG. 1, when the main core 35 is in the primary molding position, the ram 47 is at the lowest position where the lower end of the ram 47 projects downward from the lower end of the primary hydraulic cylinder 45. As shown in, when the main core 35 is in the secondary molding position, the lower end of the main core 35 is in the highest position where the main core 35 is retracted into the primary hydraulic cylinder 45. Further, a housing hole 43a having a diameter larger than that of the ram 47 is vertically formed in a portion of the central portion of the movable side mounting plate 43 facing the ram 47. Receiving hole 4 of movable side mounting plate 43
The lower end of 3a is formed into a small-diameter columnar shape and has a step-like regulation surface 4
3b is formed. On the other hand, the lower end of the push-out pin 39 has the ram 4 when the push-up block 37 is at the forming position.
A predetermined distance is extended downward from the lower end of 7.
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 and attached to the male screw portion 39a via a female screw (not shown) threaded therein. There is. The push-up piece 49 has a cylindrical shape smaller in diameter than the lower end of the accommodation hole 43a of the movable side mounting plate 43 and movable in the axial direction thereof, and has a flange 49a projecting outwardly on the outer periphery of the upper end thereof. The formed T-shaped cross section is formed, and the female screw is formed in the upper axial direction. The push-up piece 49 has the lower surface of the flange 49a abutted against and supported by the restriction surface 43b of the accommodation hole 43a of the movable side mounting plate 43.
It is designed to be prevented from falling down from the accommodation hole 43a. Further, the flange 4 of the ram 47 and the push-up piece 49.
A spring member 51 such as a compression coil spring is provided between the spring 9 and 9a.
When the external force is applied and the ram 47 is interposed, 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. . Further, a push rod 53 having a cylindrical shape with the same diameter is connected to the lower end of the push-up piece 49, and the push-up piece 53 is driven up and down (axial direction) by a push-driving means (not shown).
Also, the spring member 51 is compressed against the biasing force of the spring member 51 via the pushing pin 39, and the push-up block 37 is moved vertically from the molding position shown in FIG. 1 to the pushing position shown in FIG. It is supposed to do.

Further, the ram 47 of the primary side hydraulic cylinder 45 fixedly connected to the lower end of the main core 35 has the main core 35 at the primary molding position at the lowest position shown in FIG. 1, and is shown in FIGS. The main core 35 is set to the secondary molding position at the highest position. When the ram 47 is at the lowest position shown in FIG. At the maximum raised position of the ram 47 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 pin 39.
The flange 49a is separated upward from the regulating surface 49b by the rising distance of the ram 47. At these positions of the push-up piece 49, the spring member 51 is not biased and is in the extended state. Then, as shown in FIG. 6, at the highest position of the ram 47, the pushing rod 53 is driven upward by the pushing driving means to push up the pushing piece 49 and the pushing pin 3.
By moving up the push-up block 37 from the molding position shown in FIG. 1 to the push-out position shown in FIG. 6 via 9, the push-up piece 49 resists the urging force of the spring member 51.
And push up the block 37 to the rising distance of the ram 47.
The flange 49a is separated upward from the regulating surface 43b by a distance including the ascending distance.

A runner plate 61 is provided on the stationary mold plate 31.
And a sprue plate 63 are placed on the runner plate 61 so that they can approach and separate in the vertical direction. At two positions on the left and right of the runner plate 61 in FIG.
The sprue plate 6 is formed with 1a and 61b formed therethrough.
Cone-shaped positioning projections 65 and 67 aligned with the positioning recesses 61a and 61b are provided at corresponding positions on the lower surface of No. 3.
Are formed respectively, and when the runner plate 61 and the sprue plate 63 are brought into close contact with each other, the positioning projections 65, 6 are formed.
7 are closely fitted in the corresponding positioning recesses 61a and 61b to relatively position them at a predetermined position. The primary injection nozzle 6 is provided at a position corresponding to the positioning projection 65 on one side (left side in FIG. 1) of the sprue plate 63.
9 has a shape corresponding to the tip of the primary injection nozzle 69.
And a sprue 71 which is connected to the nozzle contact surface 63a and which penetrates the positioning projection 65 in the vertical direction (axial direction).
Are formed.

A runner 73, which communicates with the sprue 71, is formed at a position corresponding to the positioning convex portion 65 on the upper surface of the stationary mold plate 31 in a substantially angled shape from the horizontal direction along the upper surface to the vertical direction. A gate (not shown) located at the lower end of the gate communicates with the main cavity 31a.
Further, both positioning protrusions 65, 67 of the sprue plate 63
A runner lock pin 75 is fixed between the runner lock pin 75 and the runner plate 61 so that the runner plate 61 can penetrate the runner plate 61. It is exposed at the upper end of the portion that vertically penetrates the fixed-side template 31. As a result, during injection molding,
When the lower end of the runner lock pin 75 is fixed to the solidified resin in the runner 73 and the sprue plate 63 and the runner plate 61 are separated from the fixed side mold plate 31 at the mold opening position shown in FIG. The R is automatically removed from the fixed-side template 31.

The other positioning protrusion 6 (right side in FIG. 1)
At a position corresponding to 7, a hemispherical concave nozzle contact surface 63b having a shape corresponding to the tip of the secondary injection nozzle 77 and capable of connecting the secondary injection nozzle 77 is formed.
A sprue 79 that communicates with the nozzle contact surface 63b and penetrates the positioning convex portion 67 in the vertical direction (axial direction) is formed. Further, a runner 81 communicating with the sprue 79 is formed in a substantially angled shape from the horizontal direction along the upper surface to the vertical direction at a position corresponding to the positioning convex portion 67 on the upper surface of the fixed side template 31. The vertically extending portion of the runner 81 is formed by fixing the fixed side template 31 to the main cavity 31a.
The gate (not shown) located at the lower end of the main cavity 31a does not communicate with the main cavity 31a. Further, a runner lock pin 82 is fixed near the positioning protrusion 67 on the right side of FIG. 1 of the sprue plate 63 so as to extend in the vertical direction, and the runner plate 61 is disposed so as to be able to penetrate therethrough. At the mold clamping position shown in, the tip is exposed at the upper end of the part of the runner 81 that vertically penetrates the fixed-side mold plate 31. As a result, 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-side mold plate 31, the resin solidified material R is automatically removed from the fixed-side mold plate 31.

On the opposite side surfaces (left side surface and right side surface in FIG. 1) of the fixed-side template 31, supporting surfaces 83 and 85 having two steps are formed, respectively, and correspond to the supporting surfaces 83 and 85. The secondary slide cores 87 and 89 having a two-step shape are
Each is housed closely. As shown in FIG. 2, each of the secondary slide cores 87 and 89 has an outer portion 87a, 89a having a predetermined height located on the outer side and an inner portion having a predetermined height smaller than the outer portions 87a, 89a. It is composed of inner portions 87b and 89b. Inner part 87
On the inner surfaces of b and 89b, the secondary side cavities 87c of the die-cutting surface having a substantially semi-cylindrical shape corresponding to the shape of half of the outer peripheral surface of the protector 23, which is the secondary molded article of the injection molded article, and 89c is formed to have a symmetrical shape. Furthermore, symmetrical semi-cylindrical runners 87d and 89d are formed in the inner portions 87b and 89b in the vicinity of the secondary cavities 87c and 89c so as to extend in a substantially vertical direction, and the upper ends of the inner runners 87d and 89d are formed. Gates (not shown) located at the lower ends are opened to the upper surfaces of 87b and 89b and communicate with the secondary cavities 87c and 89c, respectively. On the other hand, secondary side hydraulic cylinders 91 and 95 are provided on the opposite side surfaces (the left side surface and the right side surface in FIG. 1) of the movable side mold plate 33 via fastening members such as bolts via brackets 93 and 97, respectively. The portion indicated by the arrow in the figure is fixed by screwing or the like. In addition, the secondary hydraulic cylinders 91 and 95
The tips of the rams 92 and 96 of the
, 89 on the outer side, and is fixed by screwing or the like with a fastening member such as a bolt.

As a result, the secondary hydraulic cylinders 91, 9
5, the rams 92 and 96 are projected and retracted, and the 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. It is designed to be controlled. At the primary molding position, the fixed-side template 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 side portions 87a, 89a and the inner side portions 87b, 89b are interposed.
Is in contact with the entire surfaces of the corresponding support surfaces 83, 85. Further, at the secondary molding position, the mating surfaces 87e and 8 which are the inner end surfaces of both the secondary side slide cores 87 and 89.
Fixed side template 31 is not interposed between 9e, and both mating surfaces 87e
And 89e are tightly clamped together to form the outer parts 87a, 8e.
The inner surface of 9a abuts the inner end surfaces of the support surfaces 83 and 85, the upper end surface supports an inner step surface that is continuous with the inner end surfaces of the support surfaces 83 and 85, and the upper side surfaces of the inner portions 87b and 89b are , The position where it abuts the lower surface of the fixed-side template 31. That is, the support surfaces 83, 85 or the secondary side slide core 8
The outer step and the inner step of 7,89 have the same height. 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 secondary slide cores 87 and 89. The runners 87d and 89d are integrally formed so that the upper end thereof communicates with the lower end of the runner 81 of the stationary mold plate 31.

The mold clamping device (not shown) and the hydraulic cylinder 45 allow the main core 3 as the primary side core.
5, a primary side driving means for relatively moving the main cavity 31a and the auxiliary cavity 33a as the primary side cavity in a direction in which they approach and separate from each other to clamp and open the mold.

Further, the secondary side slide cores 87 and 89
Has, as described above, the secondary side cavities 87c and 89c of the die-cutting surface corresponding to the shape of the secondary molded product, which are divided,
The molds are clamped to each other to form a secondary molding space having the same overall shape as the secondary molding product and being continuous with the primary molding space.

Then, the pair of secondary side slide cores 87, 89 are moved by the secondary side hydraulic cylinders 91, 95 into the main core 35 as the primary side core, the main cavity 31a as the primary side 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 and clamp and open the mold.

Next, a molding method using the injection molding apparatus of the present embodiment configured as described above will be described together with the operation of the injection molding apparatus. The molding method described below is based on CP
A well-known control means including U, ROM, RAM, etc. is used to implement the control program stored in the ROM in advance.

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

In the mold clamping process shown in FIG. 1, a mold clamping device (not shown) as a primary side driving means is driven to drive the back plate 41.
And, the movable side mold plate 33 integrated with the movable side mounting plate 43 is clamped to the fixed side mold plate 31. Further, the ram 47 of the primary side hydraulic cylinder 45 is set to the lowest position and the main core 35
As the primary molding position, and extrusion drive means (not shown)
Is controlled to drive the push-up block 37 to the molding position.
Then, the main core 35 as the primary side core and the push-up block 37 are connected to each other by the main cavity 31 as the primary side cavity.
A and the auxiliary cavity 33a are clamped, a primary molding space having the same shape as that of the primary molded product is formed between them, and the primary molding is possible. At this time, the secondary side hydraulic cylinders 91 and 95 are drive-controlled to immerse the rams 92 and 96 to open the secondary side slide cores 87 and 89 in the mold open state, that is, as shown in FIG. The state in which the end vertical surface is arranged 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 of the support surface 83 and 85 of the fixed-side template 31 at substantially the same position It is held in a state of sliding contact with the inner end vertical surface of 85 and does not interfere with the fixed side mold plate 31 to prevent the mold 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 stationary mold plate 31, and the positioning projection 6 of the sprue plate 63 is placed.
5, 67 are closely fitted into the positioning recesses 61a, 61 of the runner plate 61, and the sprues 71, 79 of the sprue plate 63 are fitted.
To the runners 73 and 81 of the fixed-side template 31. Then, the sprue 71 of the sprue plate 63 is fixed to the fixed-side template 3
1 through the runner 73 to communicate with the primary molding space from the main cavity 31a portion, and then the primary side injection nozzle 69
By pressing the lower end against the nozzle contact surface 65a of the sprue plate 63, it becomes possible to inject the molten resin from the primary side injection nozzle 69 through the sprue 71 and the runner 73 into the primary molding space from the main cavity 31a. 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 can be joined to the resin solidified material R during injection molding.

At this time, in the example of FIG. 1, the secondary injection nozzle 77, together with the primary injection nozzle 69, is brought close to the sprue plate 63 and pressed against the nozzle contact surface 65b. Since it is performed in a later step, the secondary injection nozzle 77 does not need to be in pressure contact with the nozzle contact surface 65b of the sprue plate 63 as in FIG. Therefore, the primary side injection nozzle 69 and the secondary side injection nozzle 77 are separately provided in the sprue plate 6.
3, the primary injection nozzle 69 is used for the primary molding, and the secondary injection nozzle 77 is used for the secondary molding.
Independently of the nozzle contact surfaces 65a, 6a of the sprue plate 63.
You may make it press-contact with 5b.

Then, in the injection step, an injection device (not shown)
The molten resin is injected and injected into the sprue 71 through the primary side injection nozzle 69, and is formed by 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 through the runner 73. The molten resin is filled in the primary molding space. 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
Also, the primary side runner 73 of the fixed-side template 31 is filled with the resin and is cooled and solidified to form a resin solidified material 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, it joins with the resin solidified material R at the time of injection molding.

After the base 21 and the flange 22 are primarily formed, in a mold opening step shown in FIG. 3, the mold clamping device is driven to separate the movable side mold plate 33 from the fixed side mold plate 31 and to open the mold. 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 separated from each other. As a result, the main core 35 and the push-up block 37 as the primary side core, and the main cavity 31a that constitutes the main part of the primary side cavity are opened, and the primary molded product including the base 21 and the flange 22 becomes the main cavity. It is released from 31a and remains on the main core 35. At this time, since the lower end of the primary runner lock pin 75 is joined to the resin solidified material R in the runner 73, the resin solidified material R is released from the mold and the runner lock pin 75 is attached.
, And is automatically cut off from the primary molded product at its gate portion.

Next, the protector 23 as a secondary molded product
The secondary molding step of molding the resin into the recess 22a at the lower end of the flange 22 includes a mold clamping step shown in FIGS. 4 and 5, and a mold opening step (not shown).

That is, after the primary molding, in the mold clamping process of the secondary side slide cores 87 and 89 shown in FIGS. 4 and 5, first,
While the fixed side mold plate 31 and the movable side mold plate 33 are maintained in the mold open state shown in FIG. 1, the primary side hydraulic cylinder 45 is driven to bring the ram 47 to the highest position and the main core 35 from the primary molding position. Moves up to the secondary molding position. The push-up block 37 keeps the molding position following the upward movement of the main core 35. Then, the secondary side hydraulic cylinders 91 and 95 as the secondary side driving means are driven to move the pair of left and right secondary side slide cores 87 and 89 in the vertical direction which is the moving direction of the primary side core and the primary side cavity. Move in the horizontal direction, which is a different direction from, and clamp the mold. That is, the rams 92 and 96 are projected to attach the secondary side slide cores 87 and 89 to the movable side mold plate 33.
It slides along the upper surface, and the mating surfaces 87e, 89e are closely contacted and the mold is clamped. Then, the secondary side slide core 87,
The semicircular lower end edges of the inner portions 87b and 89b of 89 closely contact with the outer peripheral surface of the main core 35 and seal,
Inner portions 87b and 89b of the secondary side slide cores 87 and 89
The semicircular upper end edge portion of the above is in close contact with the upper end outer circumference of the flange 22 of the primary molded product on the main core 35. As a result, the secondary side cavity 87 of both the secondary side slide cores 87 and 89 is
Between c and 89c, a secondary molding space having the same shape as the entire outer peripheral shape of the protector 25 as a secondary molding product is formed,
Secondary molding of the protector 23 on the outer periphery of the flange 22 becomes possible. At the same time, the runners 87d and 89d of the secondary-side slide cores 87 and 89 are integrated and extend substantially vertically and the gate located at the lower end thereof is connected to the secondary-side cavity 87.
The c and 89c are communicated with the secondary molding space.

At this time, the movable side mold plate 33 having the main core 35 as the primary side core is maintained in the mold open state and fixed with respect to the fixed side mold plate 31 having the main cavity 31a as the primary side cavity. The side template 31 does not interfere with the movement of the secondary side slide cores 87 and 89 during movement thereof.

After that, in the mold clamping process 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 used.
Is placed at a predetermined position on the stationary mold plate 31, and the positioning projections 65 and 67 of the sprue plate 63 are closely fitted into the positioning recesses 61a and 61 of the runner plate 61. Then, as shown in FIGS. 4 and 5, the supporting surfaces 83, 8 of the fixed-side template 31 are
The step surface inside 5 is abutted and supported by the step surfaces of the outer side portions 87a and 89a of the secondary side slide cores 87 and 89, and the lower surface of the fixed side template 31 is the secondary side slide core 87,
The inner surfaces 87b and 89b of 89 are supported by being abutted against the step surfaces. At the same time, the sprue 79 of the sprue plate 63 communicates with the runner 81 of the fixed-side template 31 and the fixed-side template 31
The lower end of the runner 81 communicates with the upper ends of the runners 87d and 89d in which the secondary side slide cores 87 and 89 are integrated. 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 ejected from the secondary injection nozzle 77.
The molten resin can be injected and injected into the secondary molding space via d and 89d. At the same time, the lower end of the runner lock pin 82 is exposed inside the runner 81, so that the runner lock pin 82 can be joined to the resin solidified material R during injection molding.

Then, in the injection step, an injection device (not shown)
From the secondary injection nozzle 77, the molten resin is injected and injected into the sprue 79, and the runner 81 and the runners 87d, 8
The molten resin is filled into the secondary molding space formed by the secondary side cavities 87c and 89c from the gate located at the lower end through 9d. After that, when the resin is cooled and solidified, the protector 23 as a secondary molded product is integrally molded on the outer periphery of the recess 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-side template 31 to be cooled and solidified,
A resin solidified product R having a shape corresponding to those is formed. The lower end of the runner lock pin 82 on the secondary side is the runner 8
Since it is exposed inside 1, it is bonded to the resin solidified material R at the time of injection molding.

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

After the protector 23 is integrally molded with the flange 22, although not shown, in the mold opening process of the entire mold performed in the same manner as in FIG. 3, the mold clamping device is driven to move the movable side mold plate 33. Is opened from the fixed-side mold plate 31 and the runner plate 61 and the sprue plate 63 are fixed to the fixed-side mold plate 3.
1, and the sprue plate 63 and the runner plate 61 are separated from each other. In synchronization with this, the secondary slide core 8
In the mold opening process of 7, 89, the secondary side slide cores 87, 8
9 is separated from the main core 35 and slid horizontally. As a result, the main core 35 and the push-up block 37 as the primary side core and the main cavity 31a that constitutes the main part of the primary side cavity are opened, and the base 21 is opened.
The main core 35 is a molded product in which a protector 23 as a secondary molded product is integrally molded with a primary molded product composed of a flange 22 and a flange 22.
Remain on top. Further, at this time, since the lower end of the runner lock pin 82 on the secondary side is joined to the resin solidified substance R in the runner 81, the resin solidified substance R in the runner 81 and the runners 87d and 89d joined to the lower end thereof The resin solidified substance R is lifted following the runner lock pin 82 as the mold is opened, and is automatically cut off from the protector 23, which is a secondary molded product on the main core 35, at the gate portions at the lower ends of the runners 87d and 89d. To be done.

At the same time as the mold opening operation of the movable side mold plate 33, the secondary side slide cores 87 and 89 are not opened, and the secondary side slide cores are not opened after the mold opening operation of the movable side mold plate 33. 87, 89 mold opening operation may be performed. In this case, the runner 87 of the secondary slide cores 87 and 89
Since the resin solidified substance R remains in d and 89d, the resin solidified substance R is removed by manual work or the like.

After that, in the product take-out step shown in FIG. 6, the pushing-out block is driven against the biasing force of the spring member 51 through the pushing-out rod 53, the pushing-up piece 49 and the pushing-out pin 39 by driving the pushing-out driving means. 37 is moved up from the molding position to the unloading position.
As a result, the molded product on the main core 35 is transferred to the extrusion block 37.
Following this, the product can be taken out by separating upward from the main core 35.

As described above, the injection molding apparatus of the above embodiment is provided on one of the fixed side mold plate 31 as the fixed main mold and the movable side mold plate 33 as the movable main mold, and the base 21 as the primary molded product. And a main core 35 and a push-up block 37 as a primary side core having a die-cutting surface corresponding to one side surface of the flange 22 and the other of the fixed-side mold plate 31 and the movable-side mold plate 33, and the base 21 and the flange 22. A main cavity 31a as a primary side cavity having an engraved surface corresponding to the other side surface and being clamped with the main core 35 to form a primary molding space having the same shape as that of the base 21 and the flange 22; Cavity 33a, main core 35, main cavity 31a, and auxiliary cavity 33a
And the mold corresponding to the shape of the protector 23 as the secondary molded product, and the mold clamping device and the primary hydraulic cylinder 45 as the primary side driving means for relatively moving the molds toward and away from each other to clamp and open the mold. The secondary side cavities 87c and 89c of the carved surface are divided and clamped to each other to have the same overall shape as the protector 23,
In addition, the pair of secondary side slide cores 87 and 89 forming a secondary molding space that is continuous with the primary molding space, the secondary side slide cores 87 and 89, the main core 35, the main cavity 33a, and the auxiliary cavity. It is provided with secondary side hydraulic cylinders 91 and 95 as a secondary side drive means that moves in a direction different from the moving direction of 33a and performs mold clamping and mold opening.

Therefore, in the above embodiment, when the mold clamping device and the primary side hydraulic cylinder 45 are driven to 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 interposed therebetween. A primary molding space having the same shape as is formed, and the primary molding becomes possible. At this time, the secondary side slide cores 87, 89
Holds the mold open state so as not to interfere with the operation of the main cavity 31a. Further, after the primary molding, the mold clamping device and the primary side hydraulic cylinder 45 are driven to open the main core 35, the main cavity 31a and the auxiliary cavity 33a, and then the secondary side hydraulic cylinders 91 and 95 are driven to make a pair. The secondary side slide cores 87, 89 of the main core 35, the main cavity 31a, and the auxiliary cavity 33a.
When the mold is clamped by moving in a direction different from the moving direction of, the secondary molding space having the same shape as the overall shape of the protector 23 is formed between them, and the secondary molding becomes possible. At this time, the main core 35, the main cavity 31a, and the auxiliary cavity 33a are held in the mold open state so as not to interfere with the operation of the secondary side slide cores 87 and 89 by interference.
In such operation, the main cavity 31a for primary molding
Since the auxiliary cavity 33a and the secondary cavities 87c and 89c for secondary molding are provided completely separately, the shape of the secondary molded article such as the protector 23 is related to the shape of the primary molded article such as the base 21. There is no limit. 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
a and the auxiliary cavity 33a are once opened,
Since the secondary molding is performed, even if a burr that is the resin solidified material R is generated in the primary molded product such as the base 21, the burr is removed by the runner lock pins 75 and 82 when the mold is opened. As a result, the appearance quality of the molded product can be improved.

After the primary molding, the main core 35, the main cavity 31a, and the auxiliary cavity 33a are opened,
When the secondary slide cores 87 and 89 are clamped, the main core 35, the main cavity 31a, and the auxiliary cavity 33a are separated and held by the supporting surfaces of the secondary slide cores 87 and 89 at a predetermined distance. At this time, the main core 35
Since the main cavity 31a is provided with a predetermined draft, the surface of the primary molded product such as the base 21 is separated from the main cavity 31a (particularly its corners) and does not contact the main cavity 31a. . As a result, there is no problem that the surface of the primary molded product such as the base 21 comes into contact with the corners of the main cavity 31a and is scratched, and the appearance quality of the molded product can be maintained excellent.

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

FIG. 7 is a front sectional view showing a state in which 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 is FIG.
FIG. 6 is a plan view showing a state in which the base slide core in the use position and the protector slide core in the standby position are viewed from above. 9 is a side sectional view of the injection molding apparatus of FIG. FIG. 10 is a 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 a state in which 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 are viewed from above. 12
FIG. 11 is a front cross-sectional view showing a state in which the protector slide core is moved to the use position to form a protector molding space and the protector is injection molded while the injection molding apparatus of FIG. 10 is clamped again. FIG. 13 is a plan view showing a state in which the base slide core in the standby position and the protector slide core in 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 injection molding of the protector and the protector slide core is returned to the standby position.

In the injection molding apparatus of the first embodiment, the movable side mold plate 33 which constitutes the movable main mold is provided with the auxiliary cavity 33a which becomes the cavity of the concave portion 22a at the lower end of the flange 22 of the base 21 as the primary molded product. Along with the main core 3
5 is moved up and down by the hydraulic cylinder 45 to control the movement between the primary molding position and the secondary molding position to switch the primary molding space and the secondary molding space, but as shown in FIGS. Unlike the first embodiment, the injection molding apparatus of the embodiment includes a base 21 as a primary molded product by using primary slide cores 201 and 203 having the same configuration as the secondary slide cores 87 and 89 of the first embodiment. The cavity 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, at the positions separated by a predetermined distance on both sides of the main core 35, respectively.
The supporting surfaces 183 and 185 having a stepped shape are formed, and the supporting surface 1
Corresponding step-shaped primary side slide cores 201 and 203 are housed in close contact with the lower surfaces of the fixed-side template 31 inside the support surfaces 183 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, 203a having a predetermined height located on the outer side and inner portions 201b, 201b having a predetermined height smaller than the outer portions 201a, 203a located on the inner side. It is composed of The inner surface of each of the inner portions 201b, 201b has a recess 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 shape of the half of 2a in the circumferential direction are formed to have a symmetrical shape. In the present embodiment, the primary cavity 31a of the stationary mold plate 31 constitutes a first primary cavity, and the primary slide cores 201 and 203 have the primary cavity 201a.
c and 201c form a second primary side cavity, and these form a primary side cavity having the same shape as the entire one side surface of the base 21 (the entire upper surface and the entire outer peripheral surface of the flange 22 and the lower end surface of the flange 22). . As a result, at the mold clamping position shown in FIG.
Main cavity 31a, primary side slide cores 201,
A primary molding space having the same shape as that of the base 21 is formed between the primary cavities 201c and 201c of 03, the main core 35, and the push-up block 37.

Further, in the vicinity of the primary side cavities 201c, 203c of the inner parts 201b, 203b, symmetrical semi-cylindrical runners 201d, 203d are formed so as to extend substantially vertically, and the upper ends thereof are formed. Inner part 20
1b and 203b are opened to the upper surface, and gates (not shown) located at the lower ends are provided on the primary side cavities 201c and 203b.
It communicates with c respectively. The secondary side hydraulic cylinder 9 for the secondary side slide cores 87, 89 of the first embodiment.
Similar to the relationship of Nos. 1 and 95, primary side hydraulic cylinders 91 and 95 are fixed to the opposite side surfaces (left side surface and right side surface in FIG. 7) of the movable side mold plate 33, respectively, and rams 92 and The tip of 96 is fixed to the outside of the primary slide cores 201 and 203, and the secondary hydraulic cylinder 9
1, 95 are driven and controlled, and the rams 92, 96 are projected and retracted, so that the primary slide cores 201,
03 is controlled to move between the primary molding position shown in FIGS. 7 and 8 and the secondary molding position shown in FIGS. 10 to 13. At the primary molding position, the fixed-side template 31 is not interposed between the mating surfaces 201e and 201e, which are the inner end surfaces of the primary-side slide cores 201 and 203,
The mating surfaces 201e and 201e are closely clamped so that the entire upper surface of the outer portions 201a and 201a abuts the entire inner surface of the support surfaces 183 and 185, and the inner portion 2
01b, 203b is the position where the upper end surface abuts the lower surface of the fixed-side template 31. Then, at the primary molding position, the primary cavity 2 of both the primary slide cores 201 and 203 is moved.
Flange 2 as a primary molded product between 01c and 203c
A primary molding space having a shape corresponding to the entire recess 22a in the lower part of 2 is formed, and both runners 201d and 203d are integrated so that the upper end thereof is the lower end of the runner 73 on the primary side of the fixed-side template 31. It is designed to communicate. Also, at the secondary molding position, both primary side slide cores 20 are
Mating surfaces 201e and 20 which are inner end surfaces of 1 and 203
The fixed-side template 31 is interposed between 1e, and the outer portion 201a,
The 203a and the inner parts 201b, 203b are in a non-contact state with the corresponding supporting surfaces 183, 185 or the lower surface of the fixed-side template 31.

The mold clamping device (not shown) and the primary side hydraulic cylinders 91, 95 separate the main core 35 as the primary side core, the main cavity 31a as the primary side cavity, and the primary side cavities 201c, 203c. A primary side driving means is configured to relatively move in a direction toward and away from each other to clamp and open the mold. As described above, in this embodiment, the movable side template 33 is provided by providing the primary side cavities 201c and 203c such as the recess 22a of the flange 22 in the primary side slide cores 201 and 203.
Since the auxiliary cavity 33a is unnecessary, the hydraulic cylinder 45 for vertically moving the main core 35 between the primary molding position and the secondary molding position is omitted accordingly. Further, for the same reason, the accommodation hole 13 of the movable side mold plate 33 is
3 is a guide 35a lower side of the main core 35 and a flange 35b so as to hold the main core 35 in a fixed position so as not to move up and down.
The size and shape are substantially the same as the 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. In addition, as described above, the primary side slide cores 201 and 203 are divided into 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, and the primary side cavities 201c and 203c are separated from each other. Tightened, together with the main cavity 31a,
A secondary molding space having the same shape as the overall shape of the secondary molding product and being continuous with the primary molding space is formed.

Then, by the mold clamping device, the main core 35 as the primary side core and the main cavity 31a as the primary side cavity are relatively moved in the up-and-down direction so as to approach and separate from each other. Side driving means is configured. In addition, the pair of primary side slide cores 201 and 201 are provided by the primary side hydraulic cylinders 91 and 95.
03 is moved in the 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 form the second primary side drive means for clamping and opening the mold. Has been done.

On the other hand, on the side of the other side surface (the left side surface and the right side surface in FIG. 9) of the fixed side template 31, the secondary side slide core 18 is provided on both sides of the main core 35 at a predetermined distance.
7 and 189 are arranged respectively. As shown in FIGS. 9, 11 and 12, each of the secondary side slide cores 187 and 189 has a primary side slide core 201, 203.
Has a flat plate shape with a predetermined height slightly higher than the heights of the outer parts 201a, 203a, and the inner surface thereof corresponds to the half shape of the outer peripheral surface of the protector 23 which is the secondary molded product of the injection molded product. The secondary cavities 187c and 189c of the semi-cylindrical mold engraving surface are formed to have a symmetrical shape. Further, the secondary side slide core 187,
The secondary side cavities 187c, 189 inside 189
In the vicinity of c, the runner 18 having a symmetrical semi-cylindrical shape is formed.
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.
It communicates with c respectively. The movable side mold plate 33
On the other side surface (the left side surface and the right side surface in FIG. 9) of the other side, secondary side hydraulic cylinders 91 and 95 having the same configuration as the primary side hydraulic wheels 91 and 95, respectively, are attached to the bracket 9
3 and 97, and the tips of the rams 92 and 96 are fixed to the outer side portions of the secondary side slide cores 187 and 189.

As a result, the secondary hydraulic cylinders 91, 9
5 is driven and controlled, the rams 92 and 96 are projected and retracted, 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 shown in FIGS. 13 and 14. It is designed to control movement between positions. At the primary molding position, both secondary side slide cores 18 are
Mating surfaces 187e and 18 which are inner end surfaces of 7 and 189
The fixed-side mold plate 31 is interposed between 9e, and the upper surface abuts the lower surface of the fixed-side mold plate 31 and its mating surface 187e.
And 189e are in the primary molding position, both side surfaces of the primary side slide cores 201 and 203, and the main cavity 31.
It is at a position where it is substantially in contact with a protrusion extending downward around a.
Also, at the secondary molding position, both secondary side slide cores 1 are
Mating surfaces 187e and 187 which are inner end surfaces of 87 and 189
The fixed side mold plate 31 is not interposed between 89e, and the both mating surfaces 18
The molds 7e and 189e are clamped in close contact with each other, and the upper surface thereof comes to a position where the protrusion extending downward around the main cavity 31a is supported. 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 187c and 189c of both the secondary slide cores 187 and 189. Is formed, the two runners 187d and 189d are integrated, and the upper end thereof is the runner 181 of the fixed-side template 31.
It is designed to communicate with the lower end of. The runner 181 of the fixed-side mold plate 31 has a different flow path from that of the runner 81 of the first embodiment, and the lower end of the runner 181 of the secondary-side slide cores 187 and 189 at the secondary molding position at the mold clamping position. It is adapted to communicate with the upper ends of the integrated runners 187d and 189d.

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

Further, the secondary side slide cores 187, 1
As described above, the reference numeral 89 has divided secondary cavities 187c and 189c of the die-cutting surface corresponding to the shape of the secondary molded product, and the molds are clamped together to form the overall shape of the secondary molded product as a whole. A secondary molding space having the same shape as and continuous with the primary molding space is formed.

Next, a molding method using the injection molding apparatus of the present embodiment configured as described above will be described together with the operation of the injection molding apparatus. The molding method described below is based on CP
A well-known control means including U, ROM, RAM, etc. is used to implement the control program stored in the ROM in advance.

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

In the mold clamping step shown in FIG. 7, the mold clamping device (not shown) as the first primary side driving means is driven to fix the movable mold plate 33 integrated with the movable mounting plate 43. The side mold plate 31 is clamped. Further, the push-up block 37 is set to the molding position by driving and controlling the push-out driving means (not shown). Before clamping the movable side mold plate 33 to the fixed side mold plate 31, the primary side hydraulic cylinders 91 and 95 as the second primary side driving means are driven to pair the left and right primary side slide cores 201. , 203 are moved in the first horizontal direction, which is a direction different from the vertical direction, which is the moving direction of the main core 35 and the main cavity 31a, to perform mold clamping. That is, the rams 92 and 96 are projected to make the primary side slide core 2
01 and 203 are slid along the upper surface of the movable side mold plate 33, and the mating surfaces 201e and 203e are closely contacted and the mold is clamped.
Then, when the movable side mold plate 33 is clamped with respect to the fixed side mold plate 31, the semicircular lower side portions of the inner portions of the primary side slide cores 201 and 203 closely contact the outer peripheral surface of the main core 35. And seal the primary side slide core 201,
The upper side semi-circular cavities 201c and 203c of the inner portion of 203 are provided with respect to the outer peripheral surface of the main core 35.
A part of the primary molding space having a shape corresponding to the shape of the recess 22a of the flange 22 is formed. Further, the main core 35 as the primary side core and the push-up block 37 are clamped to the main cavity 31a as the primary side cavity, and a primary molding space having the same shape as the shape of the primary molded product is formed between them. Primary molding becomes possible. At the same time, the runners 201d and 203d of the primary-side slide cores 201 and 203 are integrated, and the gates extending substantially vertically and located at the lower ends thereof are communicated from the primary-side cavities 201c and 203c to the primary molding space.

At this time, the secondary hydraulic cylinder 91
And 95 to drive and drive the rams 92 and 96,
The secondary side slide cores 187 and 189 are in the mold open state, that is, as shown in FIG.
1 is held in a state of being spaced outward from a downwardly extending projection around the main cavity of No. 1 or in a state of sliding contact at substantially the same position, and interferes with the fixed side template 31 to move with the fixed side template 31. The mold clamping operation with the side mold plate 33 is not disturbed.

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 projection 6 of the sprue plate 63.
5, 67 are closely fitted into the positioning recesses 61a, 61 of the runner plate 61, and the sprues 71, 79 of the sprue plate 63 are fitted.
Is connected to the runners 73 and 181 of the fixed-side template 31.
Then, the sprue 71 of the sprue plate 63 is connected to the runner 73 of the stationary mold plate 31 and the primary slide cores 201, 20.
3 through the integrated runners 201d and 203d to communicate with the primary molding space from the main cavity 31a portion and the primary side cavities 201c and 203c portions. Primary pressure injection nozzle 69
From the main cavity 31a and the primary side cavity 20 to the primary molding space through 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, so that they can be joined to the resin solidified material R during injection molding.

At this time, in the example of FIG. 7, the secondary injection nozzle 77, together with the primary injection nozzle 69, is brought close to the sprue plate 63 and pressed against the nozzle contact surface 65b. Since it is performed in a later step, the secondary injection nozzle 77 does not need to be in pressure contact with the nozzle contact surface 65b of the sprue plate 63 as shown in FIG. Therefore, the primary side injection nozzle 69 and the secondary side injection nozzle 77 are separately provided in the sprue plate 6.
3, the primary injection nozzle 69 is used for the primary molding, and the secondary injection nozzle 77 is used for the secondary molding.
Independently of the nozzle contact surfaces 65a, 6a of the sprue plate 63.
You may make it press-contact with 5b.

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

After the base 21 and the flange 22 are primarily molded, in the mold opening step shown in FIG. 10, the mold clamping device is driven to separate the movable side mold plate 33 from the fixed side mold plate 31 and open the mold. 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 separated from each other. In synchronization with this, in the mold opening process of the primary side slide cores 201 and 203, the primary side slide cores 201 and 203 are separated from the main core 35 and slid horizontally. 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 primary side cavities 201c and 203c are opened.
The mold is opened, and the molded product in which the protector 23 as the secondary molded product is integrally molded with the primary molded product including the base 21 and the flange 22 remains on the main core 35. At this time, since the lower end of the primary runner lock pin 75 is joined to the resin solidified material R in the runner 73, the resin solidified material R is lifted following the runner lock pin 75 as the mold is opened. The part is automatically cut from the primary molded product.

Next, the protector 23 as a secondary molded product
The secondary molding step of molding the resin into the recess 22a at the lower end of the flange 22 includes 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 side slide cores 187 and 189 shown in FIGS. 12 to 14, first, the fixed side mold plate 31 and the movable side mold plate 33 are shown in FIG.
The push-up block 37 is maintained at the molding position while maintaining the mold open state shown in FIG. Then, the secondary hydraulic cylinders 91 and 95 as the secondary driving means are driven to move the pair of left and right secondary slide cores 187 and 189 to the vertical direction which is the moving direction of the primary core and the primary cavity. , And in the second horizontal direction, which is a direction different from the first horizontal direction in which the primary side slide cores 201 and 203 are moved, to perform mold clamping. That is, the rams 92 and 96 are projected to attach the secondary side slide cores 187 and 189 to the movable side mold plate 3.
3 Sliding along the upper surface, the mating surfaces 187e, 189
Close the die closely. Then, the semicircular lower end edges of the inner portions of the secondary side slide cores 187 and 189 are
The outer core surface of the main core 35 is closely sealed and the secondary side cavity 18 of the secondary side slide cores 187 and 189 is sealed.
7c, 189c has a semi-circular upper edge, and the main core 35
It is in close contact with the outer periphery of the upper end of the flange 22 of the primary molded product.
As a result, a secondary molding space having the same shape as the entire outer peripheral shape of the protector 25 as a secondary molded product is formed between the secondary cavities 187c and 189c of both the secondary slide cores 187 and 189. Secondary molding of the protector 23 on the outer circumference is possible. At the same time, the runners 187d and 189d of the secondary side slide cores 187 and 189 are integrated, and the gates extending substantially vertically and located at the lower ends thereof are communicated from the secondary side cavities 187c and 189c to the secondary molding space.

At this time, the movable side mold plate 33 having the main core 35 as the primary side core is maintained in the mold open state with respect to the fixed side mold plate 31 having the main cavity 31a as the primary side cavity and fixed. The side template 31 does not interfere with the moving secondary side slide cores 187 and 189 to prevent the operation thereof.

After that, as a mold clamping process for the entire mold, the movable mold plate 33 is clamped to the fixed mold plate 31 by a mold clamping device, and the runner plate 61 and the sprue plate 63 are used.
Is placed at a predetermined position on the stationary mold plate 31, and the positioning projections 65 and 67 of the sprue plate 63 are closely fitted into the positioning recesses 61a and 61 of the runner plate 61. Then, as shown in FIG.
As shown in FIG. 3, the lower surface of the protrusion extending downward around the main cavity 31a of the fixed-side template 31 is the secondary slide core 1
It is supported by abutting on the upper surfaces of 87 and 189. At the same time, the sprue 79 of the sprue plate 63 causes the runner 18 of the stationary mold plate 31 to move.
1, and the lower end of the runner 181 of the fixed-side template 31 communicates with the upper ends of the runners 187d and 189d that are integrated with the secondary-side 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, from the secondary injection nozzle 77.
A 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 can be joined to the resin solidified product R during injection molding.

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

In the injection step, the main core 35 as the primary side core and the main cavity 31a as the primary side cavity are kept separated by a predetermined distance by the upper surface as the supporting surface of the secondary side slide cores 187, 189. To be done. At this time, since the main core 35 as the primary side core and the main cavity 31a as the primary side cavity are provided with a predetermined draft, the surface of the base 21 as the primary molded product, especially the corners thereof, is A predetermined distance D from the main cavity 31a (particularly its corner)
However, the main cavity 31a is not in contact with the main cavity 31a.

After the protector 23 is integrally molded with the flange 22, although not shown, in the mold opening process of the entire mold performed in the same manner as in FIG. 10, the mold clamping device is driven to move the movable side mold plate 33. 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 are separated. In synchronization with this, the secondary slide core 1
In the mold opening process of 87 and 189, the secondary side slide core 18
7, 189 are separated from the main core 35 and slid horizontally. As a result, the main core 35 and the push-up block 37 as the secondary side core and the main cavity 31a that constitutes the main part of the primary side cavity are mold-opened, and the secondary molding is performed on the primary molded product including the base 21 and the flange 22. A molded product integrally formed with the protector 23 as a molded product remains on the main core 35. Further, at this time, since the lower end of the secondary runner lock pin 82 is joined to the resin solidified substance R in the runner 181, the resin solidified substance R in the runner 181 and the runners 187d and 189d joined to the lower end thereof. The resin solidified substance R is lifted following the runner lock pin 82 as the mold is opened, and is automatically cut off from the protector 23, which is a secondary molded product on the main core 35, at the gate portions at the lower ends of the runners 187d and 189d. To be done.

It should be noted that, simultaneously with the mold opening operation of the movable side mold plate 33, without performing the mold opening operation of the secondary side slide cores 187 and 189, after the mold opening operation of the movable side mold plate 33, the secondary side slide core The mold opening operation of 187 and 189 may be performed. In this case, since the resin solidified substance R remains in the runners 187d and 189d of the secondary side slide cores 187 and 189, the resin solidified substance R is removed by manual work or the like.

After that, in the product taking-out step shown in FIG. 15, the pushing driving means is driven to resist the urging force of the spring member 51 through the pushing rod 53, the pushing piece 49 and the pushing pin 39,
The push-up block 37 is moved upward from the molding position to the take-out position. As a result, the molded product on the main core 35 follows the extrusion block 37 and is released upward from the main core 35, and the product can be taken out.

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

Therefore, in the above-described embodiment, when the mold clamping device is driven to move the main core 35 and the main cavity 31a in the first direction and mold clamping is performed, the primary molded product such as the base 21 is not provided between them. 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 side hydraulic cylinders 91 and 95 are driven to drive the primary side slide core 20.
When 1, 203 are moved in the second direction and the mold is clamped, the main core 35, the main cavity 31a, the primary slide core 20
A primary molding space having the same shape as the shape of the primary molded product such as the base 21 is formed between the primary cavities 201c and 203c of 1, 203, and the primary molding becomes possible. In addition,
At this time, the secondary side slide cores 187 and 189 are held in the mold open state so as not to interfere with the operation by interfering with the main core 35, the main cavity 31a and the primary side slide cores 201 and 203. 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 side 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 1
When 89 is moved in the third direction and the mold is clamped, a secondary molding space having the same shape as the overall shape of the secondary molded product made of the protector is formed between them, and the secondary molding is possible.
At this time, the main core 35, the main cavity 31a, and the primary-side slide cores 201 and 203 are held in the mold open state so as not to interfere with the operation of the secondary-side slide cores 187 and 189. In such operation,
Primary cavity 31a and primary side cavities 201c and 203c for primary molding and secondary cavity 1 for secondary molding
Since they are provided separately from 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. Further, after the primary molding, the main core 35 and the main cavity 3 are
Since the secondary molding is performed after the molds 1a and the primary-side slide cores 201 and 203 are once opened, even when burrs, which are resin solidified material R, are generated in the 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 product can be improved.

As a result, in each of the above-described embodiments, the molding cycle is faster than that of the rotary mold and the molding can be carried out by one set of molds, so that the mold manufacturing cost is reduced. In addition, since the cavity for secondary molding is not limited by the positional relationship of the core with respect to the cavity unlike the core-back type mold, the degree of freedom of the product shape is higher than that of the core-back type mold. Further, since the cavity in the fixed main mold is not configured to slide, it can be embodied in large products and molds. In addition, since the primary molded product and the cavity are separated from each other during the secondary molding, there is no possibility of scratching the product during re-molding. Furthermore, since burr cutting after molding is reliably performed,
Unlike the technique disclosed in Japanese Examined Patent Publication No. 5-35660, a structure for preventing slippage is not required, and a special finishing for that is also unnecessary. In addition, since the mold is opened at the time of primary molding and at the time of secondary molding, it is possible to avoid the operation of the device under the conventional high-pressure mold clamping, and the mold clamping pressure can be maintained as in the technique of Japanese Patent Publication No. 5-49448. No need to adjust.

By the way, the slide core 8 of each of the above embodiments
7, 89, 187, 189, 201, and 203 are configured to move in the horizontal direction corresponding to the side surfaces of the mold, but the present invention is not limited to this. It suffices as long as it can approach and separate 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 side slide core 201 of the second embodiment,
The 203 and the secondary side slide cores 187 and 189 may also be configured to move in the horizontal directions orthogonal to each other, or may be configured to move in different different directions.

Further, the shape and type of each component of the mold of the above-mentioned embodiment are also selected appropriately according to the type of molded product.

[0098]

As described above, in the injection molding apparatus 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, the primary molded article is formed between them. A primary molding space having the same shape as the shape is formed, and the primary molding is possible. At this time, the secondary side slide core is held in the mold open state so as not to interfere with the operation by interfering with the primary side core or the primary side cavity. 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 to move the plurality of secondary side slide cores to the primary side core. Also, when the mold is clamped by moving in a direction different from the moving direction of the primary side cavity, a secondary molding space having the same shape as the overall shape of the secondary molded product is formed between them, and the secondary molding becomes possible. 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 operation by interfering with the secondary side slide core. In such an operation, since the primary cavity for primary molding and the secondary cavity for secondary molding are provided completely separately, the shape of the secondary molded article is limited in relation to the shape of the primary molded article. There is no. As a result, the degree of freedom of the shape of the final molded product can be increased. Further, after the primary molding, the primary side core and the primary side cavity are once opened, and then the secondary molding is performed. Therefore, even if burrs are generated in the primary molded product, such burrs are removed when the mold is opened. As a result, the appearance quality of the molded product can be improved.

The injection molding apparatus according to the invention of claim 2 is
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 shape of the primary molded product is formed between them, and the primary molding becomes possible. At this time, the secondary side slide core is held in the mold open state so as not to interfere with the operation by interfering with the primary side core or the primary side cavity. Also, after primary molding,
After driving the primary side drive means to open the primary side core and the primary side cavity, the secondary side drive means is driven to move the plurality of secondary side slide cores to move the primary side core and the primary side cavity. When the mold is clamped by moving in a direction different from the direction, a secondary molding space having the same shape as the overall shape of the secondary molded product is formed between them, and the secondary molding is possible. In addition,
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 operation by interfering with the secondary side slide core. In such an operation, since the primary cavity for primary molding and the secondary cavity for secondary molding are provided completely separately, the shape of the secondary molded article is limited in relation to the shape of the primary molded article. There is no. As a result, the degree of freedom of the shape of the final molded product can be increased. Further, after the primary molding, the primary side core and the primary side cavity are once opened, and then the secondary molding is performed. Therefore, even if burrs are generated in the primary molded product, such burrs are removed when the mold is opened. As a result, the appearance quality of the molded product can be improved.

The injection molding apparatus according to the invention of claim 3 is
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 when the die is clamped. A supporting surface is provided that holds the primary core and the primary cavity in close contact with each other by a predetermined distance.

Therefore, after the primary molding, the primary side core and the primary side cavity are opened, and when the plurality of secondary side slide cores are clamped, the primary side core and the primary side cavity are supported by the supporting surface of the secondary side slide core. Are held by being separated by a predetermined distance. At this time, since the primary core and the primary cavity are provided with a predetermined draft, the surface of the primary molded product is in a state of being separated from the primary core or the primary cavity (particularly their corners), There is no contact with the core or the primary cavity. As a result, there is no problem that the surface of the primary molded product comes into contact with the corners or the like of the primary side core or the primary side cavity and is scratched, and the appearance quality of the molded product can be maintained in good condition.

The injection molding apparatus according to the invention of claim 4 is
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 clamping is performed,
A primary molding space having the same shape as the shape between one side surface of the primary molded product and a part of the other side surface is formed between them. on the other hand,
When the second primary side driving means is driven to move the plurality of primary side slide cores in the second direction and mold clamping is performed, the primary side core, the first primary side cavity, and the second primary slide cores A primary molding space having the same shape as that of the primary molded product is formed between the primary side cavity and the primary side cavity, and the primary molding is possible. At this time, the secondary side slide core is held in the mold open state so as not to interfere with the operation by interfering with the primary side core, the first primary side cavity and the primary side slide core. After the primary molding, the first primary side driving means is driven to open the primary side core and the first primary side cavity, and the second primary side driving means is driven to drive the first primary side slide core to the first side. After opening the primary side cavity 2 of the second mold, the secondary side driving means is driven to move the plurality of secondary side slide cores in the third direction to perform mold clamping. A secondary molding space having the same shape as the entire shape of is formed, and secondary molding is possible. 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 operation by interfering with the secondary side slide core. In such an operation, the first and second primary-side cavities for primary molding and the secondary-side cavities for secondary molding are provided separately from each other, so that the shape of the secondary molded article is different from that of the primary molded article. You are not limited by relationships. As a result, the degree of freedom of the shape of the final molded product can be increased. Further, after the primary molding, the primary core, the first primary cavity, and the primary slide core are once opened, and then the secondary molding is performed. It is removed when the mold is opened. As a result, the appearance quality of the molded product can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state where a molding space for a base is formed by clamping a mold of an injection molding device according to a first embodiment of the present invention.

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

FIG. 3 is a cross-sectional view showing a state where 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 is a diagram showing the injection molding apparatus of FIG.
It is a front sectional view showing the state where a protector was injection-molded by forming a protector molding space.

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

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

FIG. 7 is a front sectional view showing a state in which 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.

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

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 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 a state in which 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 are viewed from above.

12 is a front view showing a state where the protector is injection-molded by remolding the injection molding apparatus of FIG. 10 and moving the protector slide core to a use position to form a protector molding space. FIG.

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

14 is a side sectional view of the side of the injection molding apparatus of FIG.

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

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

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

[Explanation of symbols]

 31 Fixed Side Template (Fixed Main Type) 33 Movable Side Template (Movable Main Type) 35 Main Core (Primary Side Core) 37 Push-up Block (Primary Side Core) 31a Main Cavity (Primary Side Cavity) 33a Auxiliary Cavity (Primary Side) Cavity) 45 Primary side hydraulic cylinder (primary side drive means) 87 Secondary side slide core 89 Secondary side slide core 91 Secondary side hydraulic cylinder (secondary side drive means) 95 Secondary side hydraulic cylinder (secondary side drive means) ) 91 primary side hydraulic cylinder (primary side drive means) 95 primary side hydraulic cylinder (primary side drive means) 187 secondary side slide core 187c secondary side cavity 189 secondary side slide core 189c secondary side cavity 201 primary side slide core 201c Primary cavity 203 Primary slide core 203c Primary cavity

Claims (4)

[Claims] 1. A primary-sided core having a die-sinking surface corresponding to one side surface of a primary-molded product, and a die-sinking surface corresponding to the other side surface of the primary-molded article. A primary side cavity forming a primary molding space having the same shape as the shape of the molded product, and a primary side driving means for relatively moving the primary side core and the primary side cavity in a direction of approaching and separating from each other and clamping and opening the mold. And the secondary side cavity of the die-cutting surface corresponding to the shape of the secondary molded product is divided and clamped to each other to have the same overall shape as that of the secondary molded product, and the primary A plurality of secondary side slide cores forming a secondary molding space continuous to the molding space, and a plurality of secondary side slide cores are moved in a direction different from the moving direction of the primary side core and the primary side cavity Tightening and mold opening Injection molding apparatus characterized by comprising a side drive means. 2. A primary core provided on one of a fixed main mold and a movable main mold and having a carved surface corresponding to one side surface of the primary molded product, and provided on the other of the fixed main mold and the movable main mold, A primary side cavity having a die-sinking surface corresponding to the other side surface of the primary molded article, the primary side cavity being mold-clamped with the primary side core to form a primary molding space having the same shape as the shape of the primary molded article; And the primary side cavity are moved relative to each other in a direction toward and away from each other to separate the primary side drive means for clamping and opening the mold and the secondary side cavity of the die-cutting surface corresponding to the shape of the secondary molded product. A plurality of secondary side slide cores that have the same shape as the overall shape of the secondary molded product as a whole and are clamped together to form a secondary molding space that is continuous with the primary molding space; The secondary side slide core of the 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, and the secondary slide core abuts at least one of the primary core and the primary cavity during mold clamping. The injection molding apparatus according to claim 2, further comprising a support surface that supports and holds the primary side core and the primary side cavity at a predetermined distance. 4. A primary core provided on one of a fixed mold and a movable mold, the primary core having a die-cut surface corresponding to one side surface of the primary molded product, and the primary molded product provided on the other of the fixed mold and the movable mold. And a first engraving surface corresponding to a part of the other side surface, which is clamped to the primary side core to form a first primary molding space having the same shape as one side surface of the primary molded article and a part of the other side surface. First to form
Has a primary side cavity and a second primary side cavity of a die-sinking surface corresponding to a portion other than the part of the other side surface of the primary molded article, and the mold is clamped together to form one of the primary molded article. A plurality of primary side slide cores forming a second primary molding space having the same shape as the portion other than the part of the side surface, and relative to a first direction in which the primary side cores and the primary side cavities approach and separate from each other. First primary side driving means for moving and clamping and opening the mold, and the plurality of primary side slide cores are moved in a second direction different from the moving direction of the primary side core and the primary side cavity to perform the mold clamping. And a second primary-side drive means for opening the mold and a secondary-side cavity of a die-sinking surface corresponding to the shape of the secondary-molded product, which are divided and mold-clamped to each other as a whole. The same shape as the overall shape, and A plurality of secondary side slide cores forming a secondary molding space continuous to the primary molding space; and a plurality of secondary side slide cores, a moving direction of the primary side core and the first primary side cavity, and the primary side. An injection molding device, 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.