JPH0683324U - Injection mold - Google Patents

Abstract

(57) [Abstract] [Purpose] A compact and simple structure can process undercut parts in two directions, and also increases the degree of freedom in setting the direction of the undercut parts. [Structure] First, before opening the mold, Template 18 and receiving plate 1
2 is released, the lower mold plate 18 and the receiving plate 1 are released.
The coil spring 56 separates the two from the opening 2, and the upper end 54 of the operation block 52 is disengaged from the rear surface of the insert operation portion 46 and retracted from the recess 55. The insert 41 is a coil spring 5
0 slides in the second direction B and moves backward until the rear surface of the insert body 40 contacts the bottom of the front hole 42. As a result, the second undercut unit 36 is processed. After the second undercut portion 36 is processed, the mold opening between the upper mold 16 and the lower mold 14 is started. Along with this, the inclined pin 38 rises together with the upper die 16, and the slide core 32 moves in the first direction A.
Slide back to. As a result, the first undercut unit 34 is processed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an injection molding die for injection molding a molded product having undercut portions in two different directions.

[0002]

[Prior art]

 Molded articles made of synthetic resin such as instrument panels of automobiles are required to have undercut portions in two different directions.

As an injection molding die for molding such a molded product having undercut portions in two different directions, the one shown in FIG. 3 is known.

That is, when the upper mold 102 is lifted (indicated by an arrow UP) to open the mold, the tilt pin 104 tilted with respect to the mold opening direction is also lifted, and when the tilt pin 104 is lifted. The slide core 106, which is slidably inserted, retracts in the lateral direction (leftward in FIG. 3, indicated by arrow A), and the first undercut portion 108 formed by the boss portion is released.

On the other hand, in the second undercut portion 110 formed by the hole portion, this direction is different from the direction of the first undercut portion 108, and the second undercut portion 110 is formed depending on the lateral retreat of the slide core 106. Does not release.

Therefore, the insert core 112 is provided in the thickness of the slide core 106. First, the insert core 112 is ejected together with the molded product 116 by retracting the slide core 106 in the lateral direction and raising the push pin 114. A means for manually removing the insert core 112 from the molded product 116 is adopted.

Further, in Japanese Laid-Open Patent Publication No. 61-160217, two slide cores are provided, and one slide core is moved in a direction 1 for releasing the first undercut portion with mold opening. It is known that the other slide core is driven by a cylinder in another direction for releasing the second undercut portion.

Further, in Japanese Patent Laid-Open No. 61-121920, an undercut treatment device is projected and movable in a plate, and the movement direction of the undercut treatment device is a plane perpendicular to the mold opening direction and It is known that an undercut process is performed when one direction for releasing the one undercut portion is perpendicular to the other direction for releasing the second undercut portion.

[0009]

[Problems to be solved by the device]

 By the way, in the case where the injection molding die is provided with the insert core 112, the insert core 112 is extruded together with the molded product in a state of being attached to the molded product 116. Therefore, in order to perform the next molding, It is necessary to return the storage core 112 to the mold every time, and the work is troublesome.

Further, in the case where the two slide cores are provided, the mold is enlarged correspondingly, and in order to move the slide core in the direction to remove the first undercut portion, a slide or the like is used. A separate drive source is required, which complicates the structure.

Further, when the undercut treatment device is movable in the protrusion plate, the direction of the undercut portion is limited, and the degree of freedom in setting the direction is small.

In consideration of the above facts, the present invention provides an injection molding die that is compact and has a simple structure, can process an undercut portion in two directions, and also enhances the degree of freedom in setting the direction of the undercut portion. Is the purpose.

[0013]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a female mold, a male mold corresponding to the female mold, and a mold provided between the female mold and the male mold and between the female mold and the male mold. A slide core that moves in the first direction to release the first undercut portion with opening, and a second core to release the second undercut portion provided inside the slide core and different from the first direction. And a resilient means for urging the nest in the second direction, and a movable means for moving the nest in the second direction against the biasing means by engaging and disengaging the nest. And an engaging and disengaging means for preventing the movement of the insert in the second direction based on the urging means by disposing the insert in a predetermined position and releasing the insert. To do.

[0014]

[Action]

 According to the injection mold of the present invention, the molded product includes the first undercut portion and the second undercut portion in two different directions.

To release the molded product from the mold, the engaging / disengaging means is first disengaged from the insert before opening the mold between the female mold and the male mold. When the engaging / disengaging means is disengaged from the insert, the insert moves in the second direction for releasing the second undercut portion based on the elastic means. As a result, the second undercut portion is processed.

Next, when the mold opening between the female mold and the male mold is performed, the slide core moves in the first direction for releasing the first undercut portion with the mold opening, and the first core is released. The undercut part is processed.

When the insert core is used to process the undercut parts in two different directions, it is necessary to set the insert core again in the mold, but in the present invention, such a need is not necessary. , Automatic injection molding operation is possible. Further, when two slide cores are provided, the slide core corresponding to the second undercut portion needs to be driven by a cylinder or the like, but the present invention does not need to do so.

Therefore, the undercut portions in two different directions can be processed with a compact and simple structure.

Further, the first undercut portion and the second undercut portion are the first undercut portion and the second undercut portion on the surface along the ejection direction (protrusion direction) of the molded product from the mold. The degree of freedom in setting the direction of the undercut portion can be increased by freely setting the relationship between the cut portion and both directions. In other words, the degree of freedom in designing the molded product increases.

[0020]

【Example】

 An injection mold according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

In the injection-molding die 10 of this embodiment, as shown in FIG. 1, the receiving plate 12 is arranged horizontally, and the lower mold 14 constituting a female mold (cavity) is arranged on the receiving plate 12. An upper die 16 which constitutes a male die (core) is arranged on the lower die.

The lower mold 14 is configured by fixing the cavity block 20 to the upper surface of the lower mold plate 18, and the cavity block 20 is positioned corresponding to the lower surface of the bottom of the molded product 22.

In the upper mold 16, the first core block 26 is fixed to the center of the lower surface of the upper mold plate 24, and the second core block 28 is fixed to the center of the lower surface of the first core block 26. An inclined block 30 is fixed to the peripheral edge of the lower surface of the template 24. The first core block 26 is located at the upper end edge of the opening of the molded product 22, and the second core block 28 is located at the inner surface of the molded product 22.

The upper mold 16 is driven up and down by a cylinder (not shown) or the like, and by lifting and lowering, the mold between the upper mold 16 and the lower mold 14 is opened and the mold is clamped.

The inner peripheral surface of the inclined block 30 is formed by an inclined surface that is inclined with respect to the protruding direction (vertical direction) of the molded product 22, and faces the outer peripheral surface of a slide core 32, which is also formed by the inclined surface and is described later. .

The molded product 22 has a first undercut portion 34 formed by a boss portion and a second undercut portion 36 formed by a hole portion on the outer peripheral surface thereof. The direction of 34 (the axial direction of the boss portion) is horizontal, and the direction of the second undercut portion 36 (the center line direction of the hole) is different from the direction of the first undercut portion 36 in the vertical direction. The direction is inclined toward the direction side.

A slide core 32 is provided between the lower mold 14 and the upper mold 16, and the slide core 32 is positioned at the outer peripheral surface of the molded product 22.

In the thickness of the slide core 32, the middle portion of the tilt pin 38 which is parallel to the facing tilt surface between the tilt block 30 and the slide core 32 slidably penetrates through the tilt pin 30. The upper end of 38 is fixed to the upper mold plate 24. When the upper mold 16 is lifted (indicated by an arrow UP in FIG. 1) and the mold is opened between the upper mold 16 and the lower mold 14, the tilt pin 38 is also lifted accordingly, and the tilt pin 36 and the slide are moved. With respect to the core 32, the slide core 32 retracts in the first direction (horizontally left in FIG. 1) A for releasing the first undercut portion 34. As a result, the process of the first undercut portion 34 for releasing the first undercut portion 34 is performed.

The slide core 32 is provided with an insert 41 corresponding to the second undercut portion 36. The insert 41 includes an insert main body 40 and an insert operating portion 46. The insert main body 40 has a second undercut formed in the thickness of the slide core 38 along the direction of the second undercut part 36. It is accommodated in the front hole 42 of the front hole 42 on the side of the cut portion 36 and the rear hole 44 on the opposite side thereof, and the nest operation portion 46 is accommodated in the rear hole 44. The insert main body portion 40 and the insert operation portion 46 are connected by a bolt 48 penetrating the common hole bottom wall of both holes 42, 44, and are integrally formed in each hole 42, 44 with the second undercut portion. It can slide along 36 directions. In the rear hole 44, a coil spring 50 that constitutes an elastic means is interposed between the nest operating portion 46 and the bottom of the rear hole 44. According to the coil spring 50, the nest 41 includes the second It is urged in the second direction B for releasing the undercut portion 36. The amount of movement of the insert 41 in the second direction B is restricted by the insert 41 contacting the bottom of the front hole 42.

An operating block 52, which constitutes an engaging / disengaging means, is provided through the periphery of the lower mold 14 so as to be slidable up and down. The lower end of the operating block 52 is fixed to the receiving plate 12, and the upper end 54 is During mold clamping, the lower surface of the slide core 32 enters the recess 55 formed to communicate with the rear hole 44, and abuts and engages with the end of the insert 41 on the side opposite to the molded product or the rear surface of the insert operating portion 46. The movement of the insert 41 in the second direction is blocked against the biasing force of the coil spring 50. As a result, the insert 41 is held at the predetermined position.

A coil spring 56 is interposed between the receiving plate 12 and the lower mold plate 18 of the lower mold 14. According to the coil spring 56, the lower mold plate 18 and the receiving plate 12 are separated from each other. Be energized.

During mold clamping, the lower mold plate 18 and the receiving plate 12 are held in contact with each other by holding means (not shown). When the holding state of the contact between the lower mold plate 18 and the receiving plate 12 is released, the lower mold plate 18 and the receiving plate 12 are separated by the biasing force of the coil spring 56, and the upper end 54 of the operating block 52 is separated. Is separated from the rear surface of the insert operation portion 46 and retracted from the recess 55. As a result, the insert 41 can move in the second direction B based on the biasing force of the coil spring 50, and the second undercut portion 36 for releasing the second undercut portion 36 is processed. By retracting the upper end 54 of the operation block 52 from the recess 55, the slide core 32 can move in the first direction A.

A contact engagement surface of the upper end 54 of the operation block 52 with the rear surface of the nest operation portion 46 is formed to be inclined with respect to the moving direction of the operation block 52. According to this, when performing the mold clamping in preparation for the next molding, if the lower mold plate 18 and the receiving plate 12 are brought into contact with each other against the biasing force of the coil spring 56, the operation block 52 is inserted. The engagement and return to the rear surface of the child operating portion 46 are smoothly performed.

Next, the operation of the above embodiment will be described. After molding the molded product 22 by injecting the synthetic resin, first, before the mold opening, as shown in FIG. 2, the holding state of the contact between the lower mold plate 18 and the receiving plate 12 is released. As a result, the lower mold plate 18 and the receiving plate 12 are separated and opened by the coil spring 56, and the upper end 54 of the operating block 52 is disengaged from the rear surface of the insert operating portion 46 and retracted from the recess 55. The insert 41 is slid in the second direction B by the coil spring 50 and retracts until the rear surface of the insert body 40 comes into contact with the bottom of the front hole 42. As a result, the second undercut section 36 is processed.

After the second undercut portion 36 is processed, the mold opening between the upper mold 16 and the lower mold 14 is started. Along with this, the inclined pin 38 ascends together with the upper mold 16, and the slide core 32 slides in the first direction A and retracts. As a result, the first undercut unit 34 is processed.

After all the undercut portions 34, 36 of the molded product 22 have been processed in this manner and the molded product 22 has been released from the mold 10, the mold 10 is ready for the next molding. The lower mold plate 18 and the receiving plate 12 may be returned to the abutting state and held, and the lower mold plate 18 and the receiving plate 12 may be returned to the abutting state to operate the operating block. The upper end 54 of the hook 52 is again engaged with the rear surface of the insert actuating portion 46, and the insert 41 attains a predetermined position.

When the insert core is used to process the undercut parts in two different directions, it is necessary to set the insert core again in the mold, but in the present embodiment, such need is not necessary. Instead, automatic injection molding operation is possible.

Further, when two slide cores are provided to process the undercut portions in different two directions, the movement of the slide core corresponding to the second undercut portion needs to be driven by a cylinder or the like. However, in the present embodiment, such a need is not necessary, and the movement of the insert 41 corresponding to the second undercut portion 36 is sufficient with the biasing force of the coil spring 50.

Therefore, the undercut portions in different two directions are processed with a compact and simple structure.

Further, the first undercut portion 34 and the second undercut portion 36 are the same as the first undercut portion 34 on the surface along the take-out direction (projection direction) of the molded product 22 from the mold 10. The degree of freedom in setting the direction of the undercut portions 34, 36 is increased, for example, the relationship between the second undercut portion 36 and the two directions can be freely set, that is, the degree of freedom in designing the molded product 22 is increased.

The present invention is not limited to the above embodiment, and various modifications can be made without changing the gist.

For example, in the above embodiment, the engaging / disengaging means is constituted by the actuation block 52, and the upper mold 54 of the actuation block 52 is disengaged from the rear surface of the nest actuating portion 46 by the lower mold plate 18 and the receiving plate 1. It is performed by the urging force of the coil spring 56 interposed between it and the work block 52 fixedly attached to the receiving plate 12, and penetrates the lower mold 14 vertically to reach the nest 41. The present invention is not limited to this, and the biasing means for moving the actuation block 52 away from the nest actuating portion 46, the mounting position of the actuation block 52, the moving direction, the penetrating portion, etc. are arbitrary. The part to be inserted is not limited to the rear surface of the insert operation part 46, and may be another part of the insert 41. Furthermore, the engagement / disengagement means is not limited to such a structure, and various types can be used.

Further, in the above embodiment, the elastic means for urging the insert 41 in the second direction is constituted by the coil spring 50, but the invention is not limited to this and other elastic means may be used. Good.

Further, the shape and quantity of the undercut portion and the direction of the undercut portion are, of course, not limited to the above embodiment.

[0045]

[Effect of device]

 As described above, according to the injection molding die of the present invention, the undercut portion in two directions is processed and the degree of freedom in setting the direction of the undercut portion is increased with a compact and simple structure.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a main part of an injection molding die according to an embodiment of the present invention in a clamped state.

FIG. 2 is a diagram corresponding to FIG. 1 showing a processing state of a second undercut unit.

FIG. 3 is a vertical sectional view showing a part of a clamped state of a conventional injection molding die.

[Explanation of symbols]

 10 Injection Molding Mold 12 Lower Mold (Female Mold) 16 Upper Mold (Male Mold) 32 Slide Core 34 First Undercut Part 36 Second Undercut Part 41 Nesting 50 Coil Spring (Elastic Means) 52 Working Block A 1st Direction B Second direction

Claims (1)

[Scope of utility model registration request] 1. A female mold, a male mold arranged corresponding to the female mold, and a first undercut provided between the female mold and the male mold when the mold is opened between the female mold and the male mold. First for releasing parts
A slide core that moves in the second direction, an insert that is provided inside the slide core and that is movable in the second direction for releasing a second undercut portion different from the first direction, and the insert that moves in the second direction. And an elastic means for urging the insert member to engage and disengage the insert member to prevent the move of the insert member in the second direction against the biasing means by arranging the insert member at a predetermined position and urging it by detachment. An injection-molding die, comprising: an engagement / disengagement means that allows movement of the insert in the second direction based on the means.