JP2008093985A - Injection molding die and manufacturing method of injection-molded object - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection molding die which is of a simple structure, from which a molded object can be easily removed and which can save manufacturing and running costs, and a manufacturing method of an injection-molded object. <P>SOLUTION: In this injection die, a first projecting plate 17 is installed on the back side of a core surface 16a in the way that the plate 17 is movable over a specified distance to the core surface 16a facing a cavity. In addition, a first ejecting pin 19 is integrally installed in the first projecting plate 17 so as to allow the pin 19 to push the molded object 1 to a cavity side part, passing through the core surface 16a. Further, a second ejecting plate 18 is arranged between the first projecting plate 17 and the core surface 16a so as to permit the plate 18 to be movable to the core surface 16a side, leaving by inertia from the first projecting plate 17 by a pushing action of the plate 17. Besides, a second ejecting pin 20 is arranged in one piece with the second ejecting plate 18 so that the second ejecting pin 20 pushes the molded object 1 out to the cavity side part, passing through the core surface 16a to separate the molded object 1 from the first ejecting pin 19. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an injection mold and an injection molded product manufacturing method.

  In the conventional injection mold, there is a problem that the molded product is difficult to separate even if the extrusion operation is performed due to the molded product and the protruding pin being in close contact with each other or biting. As a method of solving this problem, the first projecting pin and the second projecting pin are started simultaneously and pushed out by a predetermined amount in the interlocked state, and then only the second projecting pin is added to the projecting rod pushing amount by the operation of the internal mechanism. There are methods of moving by measuring or moving only the second protruding pin alone (see, for example, Patent Document 1). The main purpose of this method is to increase the buckling strength and to distribute the mold release resistance by shortening the first protruding pin. In this method, the first projecting plate and the second projecting plate are moved in an interlocking state with the first stroke of the projecting rod, and only the second projecting plate is moved with the second stroke, whereby the molded product is removed from the first projecting pin. It can be peeled off and the molded product can be easily released.

  In addition, as another injection mold, the first projecting pin is first started, the second projecting pin is made to follow after a predetermined distance or time has elapsed, and the both are interlocked thereafter. For example, it is used for sharing a protruding function with respect to a plurality of molded products such as adding a separating function (see, for example, Patent Document 2). In addition, there are some that start the first projecting pin and the second projecting pin at the same time, stop one projecting in the middle of the stroke, and continue projecting only one of them, but there is a possibility that the operation form may become unreasonable. Therefore, it is used only for specified purposes and has low universality.

JP 9-109198 A JP-A-7-237224

  The conventional injection mold as described in Patent Document 1 has a problem that the manufacturing cost increases because the internal structure is complicated. In addition, there are many problems during production of molded products, and there is a problem that running costs increase.

  The present invention has been made paying attention to such a problem, and can easily mold the molded product with a simple structure, and can reduce the manufacturing cost and the running cost. It aims at providing the manufacturing method of an injection molded product.

In order to achieve the above object, an injection mold according to the first aspect of the present invention comprises a fixed mold and a movable mold which are provided to be openable and closable so as to form a cavity for forming a molded product therein. The movable mold includes: a core surface facing the cavity; a first projecting plate provided on a back side of the core surface so as to be movable a predetermined distance relative to the core surface; and the first projecting plate One or a plurality of first projecting pins integrally provided on the first projecting plate so as to pass through the core surface and push the molded product toward the fixed mold when moving toward the core surface; When the first projecting plate moves to the core surface side by the predetermined distance, the first projecting plate is pushed by the first projecting plate so as to move away from the first projecting plate by inertia and move to the core surface side. And the above A second projecting plate disposed between the first projecting plate and the second projecting plate, when the second projecting plate moves toward the core surface, penetrates the core surface and pushes the molded product toward the fixed mold. It is characterized by having one or a plurality of second projecting pins integrally provided on the second projecting plate so as to be separated from the projecting pins.
An injection mold according to a first aspect of the present invention is a mold for projecting the first projecting plate to the core surface by a projecting rod capable of moving the predetermined distance by pushing the first projecting plate toward the cavity surface. It is preferable that the predetermined distance can be moved by pushing to the side.

An injection molded product manufacturing method according to a first aspect of the present invention is an injection mold having a fixed mold and a movable mold that are capable of opening and closing each other and forming a cavity for molding a molded product inside when closed. The movable mold includes a core surface facing the cavity, a first projecting plate provided on the back side of the core surface, and one or more first projects provided integrally with the first projecting plate. A pin, a second projecting plate disposed between the first projecting plate and the core surface, and one or more second projecting pins provided integrally with the second projecting plate, By pushing one projecting plate toward the core surface and moving it by a predetermined distance, one or a plurality of first projecting pins penetrates the core surface to push the molded product toward the fixed mold, and the first 1 hit The second projecting plate is pushed by a plate and is moved away from the first projecting plate by inertia and moved to the core surface side, whereby the core surface is penetrated by one or a plurality of second projecting pins, and the molded product is It has the process of pushing out toward a fixed mold | type and releasing | separating from the said 1st protrusion pin, It is characterized by the above-mentioned.
The method for producing an injection-molded article according to the first aspect of the present invention can be suitably implemented using the injection mold according to the first aspect of the present invention.

  In the injection mold and the injection molded product manufacturing method according to the first aspect of the present invention, when releasing the molded product formed in the cavity, first, the movable mold is separated from the fixed mold to open the cavity. Thereafter, the first projecting plate is pushed by the projecting rod of the molding machine toward the core surface by a predetermined distance to move, and the second projecting plate is pushed by the first projecting plate and moved by the predetermined distance. The molded product can be pushed out from the core surface toward the fixed mold by the pin and the second projecting pin by the predetermined distance. At this time, because of the inertia, the second protruding plate can be further moved beyond the predetermined distance, so that the molded product can be pushed away from the first protruding pin toward the fixed mold by the second protruding pin. . Thereby, the molded product can be peeled off from the first protruding pin, and the molded product can be easily released.

  Thus, even if it does not have a complicated internal structure, it is easy to release the molded product away from the first projecting pin with a simple structure in which the second projecting pin can be moved beyond a predetermined distance by inertia. Manufacturing cost can be reduced. In addition, since the structure is simple, troubles are less likely to occur during the production of a molded product, and the running cost can be reduced. By adding a part of the shape of the molded product or a part that is difficult to release to the first protruding pin, the molded product can be easily peeled off from the first protruding pin. The movable type stops the first protruding plate when the first protruding plate is moved by a predetermined distance so that the second protruding plate is easily moved away from the first protruding plate by moving the first protruding plate by a predetermined distance. You may have a stopper.

The injection mold according to the second aspect of the present invention has a fixed mold and a movable mold that are openable and closable so as to form a cavity for forming a molded product therein, and the movable mold includes: A core surface facing the cavity, a first protruding plate provided on the back side of the core surface so as to be movable by a predetermined distance with respect to the core surface, and the first protruding plate move to the core surface side. One or more first projecting pins integrally provided on the first projecting plate so as to push through the core surface and extrude the molded product toward the fixed mold, and the first projecting plate comprises the core surface The second protrusion is disposed between the first protrusion plate and the core surface so as to be moved to the core surface side by the predetermined distance when moved by the predetermined distance when moving to the predetermined distance side. A protruding plate; When the two protruding plates move toward the core surface, one or a plurality of second members integrally provided on the second protruding plate so as to pass through the core surface and push the molded product toward the fixed mold. It has a projecting pin and a return member that biases the first projecting plate away from the second plate toward the opposite side of the core surface.
The return member preferably comprises a spring.
The mold for injection molding according to the second aspect of the present invention is configured such that the first protruding plate is moved to the core surface by a protruding rod capable of moving the predetermined distance by pushing the first protruding plate toward the cavity surface. It is preferable that the predetermined distance can be moved by pushing to the side.

An injection molding product manufacturing method according to a second aspect of the present invention is an injection molding die having a fixed mold and a movable mold which are openable and closable and which form a cavity for molding a molded product when closed. The movable mold includes a core surface facing the cavity, a first projecting plate provided on the back side of the core surface, and one or more first projects provided integrally with the first projecting plate. A pin, a second projecting plate disposed between the first projecting plate and the core surface, and one or more second projecting pins provided integrally with the second projecting plate, By pushing one projecting plate toward the core surface and moving it by a predetermined distance, one or a plurality of first projecting pins penetrates the core surface to push the molded product toward the fixed mold, and the first 1 hit After pushing the second projecting plate toward the core surface by the plate and moving it through the core surface with one or more second projecting pins, the molded product is pushed out toward the fixed mold, Urging the first projecting plate moved toward the fixed mold to the opposite side of the core surface and returning it away from the second plate, thereby separating the first projecting pin from the molded product. This is a feature.
The method for producing an injection-molded article according to the second aspect of the present invention can be suitably carried out using the injection mold according to the second aspect of the present invention.

  In the injection mold and the injection molded product manufacturing method according to the second aspect of the present invention, when releasing the molded product formed in the cavity, first, the movable mold is separated from the fixed mold to open the cavity. Next, the first projecting plate is moved by pushing the first projecting plate toward the core surface by a predetermined distance with the projecting rod of the molding machine, thereby moving the second projecting plate to the core surface side together with the first projecting plate by the first distance. The molded product can be pushed out by a first distance toward the fixed mold by the first projecting pin and the second projecting pin. The first projecting plate is separated from the molded product by urging the first projecting plate to the opposite side of the core surface with the return member and returning it away from the second plate. Thereby, the molded product can be peeled off from the retracted first protruding pin, and the molded product can be easily released.

Thus, even without having a complicated internal structure, the first projecting pin is separated from the molded product prior to the second projecting pin, and the molded product can be easily released, thereby reducing the manufacturing cost. Can be reduced. In addition, since the structure is simple, troubles are less likely to occur during the production of a molded product, and the running cost can be reduced. By adding a part of the shape of the molded product or a part that is difficult to release to the first protruding pin, the molded product can be easily peeled off from the first protruding pin.
The same injection molding mold as that of the first present invention can be used as the injection molding mold according to the second present invention. It is preferable that the injection molded product manufacturing method can be used properly. The injection mold according to the first aspect of the present invention also serves as the injection mold according to the second aspect of the present invention, thereby combining the first injection molded article manufacturing method and the second injection molded article manufacturing method. It is also possible to implement.

  According to the present invention, it is possible to provide a mold for injection molding and a method for manufacturing an injection molded product, which can easily release a molded product with a simple structure and can reduce manufacturing cost and running cost. .

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show an injection mold and an injection molded product manufacturing method according to the first embodiment of the present invention.
As shown in FIG. 1, the injection mold 10 includes a fixed mold (not shown) and a movable mold 11. The fixed mold and the movable mold 11 are provided so as to be openable and closable so as to form a cavity for forming the molded product 1 therein.

  As shown in FIG. 1, the movable mold 11 includes a movable mounting plate 12, a spacer block 13, a receiving plate 14, a movable mold plate 15, a core 16, a first projecting plate 17, a second projecting plate 18, and a first projecting. A pin 19, a second projecting pin 20, a separation regulating pin 21, a first return pin 22, a return spring 23, a second return pin 24, a sprue projecting pin 25, and a guide pin 26 are provided.

  As shown in FIG. 1, the movable side mounting plate 12 is arranged with one surface facing the fixed die so as to form the back surface of the movable die 11. The spacer block 13 is composed of two, and they are spaced apart from each other so as to form the upper surface and the lower surface of the movable mold 11, respectively. Each spacer block 13 is attached to the surface on the fixed mold side of the movable attachment plate 12. The receiving plate 14 is attached to the tip of each spacer block 13 on the fixed mold side so as to connect the spacer blocks 13. The movable mold plate 15 is attached to the surface of the receiving plate 14 on the fixed mold side. The movable mold plate 15 has a core mounting hole 15a on the surface of the fixed mold side. The core 16 is attached to the core attachment hole 15 a of the movable side template 15. The core 16 is fixed to the movable side template 15 by fitting screws or collars. The core 16 has a core surface 16a, and when the fixed mold and the movable mold 11 are closed, a cavity having the same shape as that of the molded product 1 is formed between the core surface 16a and the fixed mold. It has become.

  The first protruding plate 17 is formed by overlapping two plates. The 1st protrusion plate 17 is arrange | positioned between each spacer block 13 in the state which orient | assigned one surface to the fixed type | mold. The first projecting plate 17 is reciprocally movable along the inner surface of each spacer block 13 in the direction of the core surface 16a and the opposite side thereof, that is, in the direction toward the fixed mold and in the return direction. The first projecting plate 17 includes a regulation through hole 17a penetrating the plate on the movable mounting plate 12 side, and a movement through hole 17b having a diameter smaller than that of the regulation through hole 17a on the fixed mold side plate. have.

  The second protruding plate 18 is formed by overlapping two plates. The second protruding plate 18 is disposed between the spacer blocks 13 on the fixed mold side of the first protruding plate 17 with one surface facing the fixed mold. The second projecting plate 18 can freely reciprocate along the inner surface of each spacer block 13 in the direction of the core surface 16a and the opposite side thereof, that is, in the direction toward the fixed mold and in the return direction. Further, the second projecting plate 18 has a return through hole 18a penetrating in the thickness direction and a fixing screw hole 18b penetrating the plate on the movable mounting plate 12 side.

  The first projecting pin 19 is composed of a plurality, and is attached to the first projecting plate 17 so as to penetrate the core surface 16a and project to the fixed mold side. The first protruding pin 19 is attached through the second protruding plate 18, the receiving plate 14, the movable side mold plate 15 and the core 16. The first projecting pin 19 is provided so that the tip thereof faces the cavity when the first projecting plate 17 is in contact with the movable side mounting plate 12.

  The second projecting pin 20 is composed of one or more, and is attached to the second projecting plate 18 so as to project through the core surface 16a and project to the fixed mold side. The second protruding pin 20 is attached through the receiving plate 14, the movable side template 15 and the core 16. The second projecting pin 20 is provided so that the tip thereof faces the cavity when the first projecting plate 17 is in contact with the movable mounting plate 12 and the second projecting plate 18 is in contact with the first projecting plate 17.

  The separation restricting pin 21 is elongated and has a head portion 21a having an outer diameter slightly smaller than the inner diameter of the restricting through hole 17a of the first projecting plate 17, and a diameter smaller than the head portion 21a. The moving part 21b has an outer diameter slightly smaller than the inner diameter of the hole 17b, and a screw part 21c having a diameter smaller than that of the moving part 21b and screwed into the fixing screw hole 18b of the second protruding plate 18. The moving part 21b is formed longer than the thickness of the plate on the fixed mold side of the first projecting plate 17 by a predetermined regulation length. The separation restricting pin 21 is disposed such that the head portion 21a is movable in the length direction inside the restricting through hole 17a, and the moving portion 21b is disposed so as to be movable in the length direction inside the moving through hole 17b. The screw portion 21c is screwed into the fixing screw hole 18b of the second protruding plate 18 and fixed. When the first projecting plate 17 and the second projecting plate 18 are separated from each other by a predetermined regulation length, the separation restricting pin 21 is caused by the head 21 a hitting the plate on the fixed mold side of the first projecting plate 17. The interval between the first protruding plate 17 and the second protruding plate 18 cannot be increased beyond a predetermined regulation length.

  The first return pin 22 is integrally attached to the first projecting plate 17 so as to project to the fixed mold side. The first return pin 22 is inserted into the return through hole 18 a of the second projecting plate 18 and attached through the receiving plate 14 and the movable side mold plate 15. The first return pin 22 is provided such that, when the first projecting plate 17 is in contact with the movable side mounting plate 12, the tip is at the same level or slightly lower than the surface of the movable side mold plate 15 on the fixed mold side. ing.

  The return spring 23 is formed of a coil spring, and the first return pin 22 is inserted therein. The return spring 23 is inserted into the return through hole 18a of the second projecting plate 18, and both ends of the surface are on the fixed mold side of the first projecting plate 17 and the surface of the receiving plate 14 on the movable mounting plate 12 side. It is attached to touch. As a result, the return spring 23 biases the first projecting plate 17 back to the opposite side of the core surface 16a when the first projecting plate 17 moves toward the core surface 16a, that is, in the direction toward the fixed mold. It is supposed to be.

  The second return pin 24 is attached to the second protruding plate 18 so as to protrude to the fixed mold side. The second return pin 24 is attached so as to penetrate the receiving plate 14 and the movable side template 15. The second return pin 24 has a tip at the fixed mold side of the movable mold plate 15 when the first projecting plate 17 is in contact with the movable mounting plate 12 and the second projecting plate 18 is in contact with the first projecting plate 17. It is provided so as to be at the same level as or slightly lower than the surface.

  The sprue projecting pin 25 is attached to the center of the first projecting plate 17 so as to project to the fixed mold side. The sprue protrusion pin 25 is attached through the second protrusion plate 18, the receiving plate 14, the movable side mold plate 15, and the core 16. The sprue projecting pin 25 is provided so that the tip thereof faces the sprue connected to the cavity when the first projecting plate 17 is in contact with the movable mounting plate 12.

  The guide pin 26 is attached to the movable side mold plate 15 so as to protrude to the fixed mold side. The guide pins 26 are attached so as to penetrate the movable side mold plate 15 and protrude from the surface of the movable side mold plate 15 on the fixed mold side. The guide pin 26 can be guided by being fitted to a fixed guide bush so that the fixed pin and the movable die 11 are not displaced from each other when the fixed die and the movable die 11 are closed.

  The protruding rod 27 of the molding machine is provided so as to penetrate the center of the movable side mounting plate 12 in the thickness direction, and is disposed on the opposite side of the first protruding plate 17 with respect to the second protruding plate 18. The protruding rod 27 can reciprocate between the core surface 16a side and the opposite side thereof, that is, the direction toward the fixed mold and the return direction. The protrusion amount of the protrusion rod 27 can be freely adjusted by machine operation. For this reason, the protruding rod 27 can protrude from the surface of the movable mounting plate 12 on the fixed mold side by a predetermined first distance. Thereby, the protruding rod 27 can move by pushing the first protruding plate 17 toward the fixed mold by the first distance.

  In the injection mold 10, the movable mold 11 and the fixed mold are closed, and the molten resin is poured into the cavity to be molded. When releasing the molded product 1 formed in the cavity, first, the movable mold 11 is separated from the fixed mold to open the cavity. Thereafter, as shown in FIG. 2A, the first projecting plate 17 is pushed by the projecting rod 27 toward the core surface 16a by a first distance and moved. Accordingly, the second projecting plate 18 is pushed by the first projecting plate 17 and moved by the first distance, and the molded product 1 is pushed out by the first projecting pin 19 and the second projecting pin 20 toward the fixed mold by the first distance. Can do. At this time, the first return pin 22, the second return pin 24, and the sprue protruding pin 25 also move toward the fixed mold by the first distance.

  If moved by the first distance, as shown in FIG. 2B, due to inertia, the second protruding plate 18 further moves within the range of the regulation length of the separation regulation pin 21, and the first distance and the regulation length are obtained. And move to the second distance. At this time, the second projecting plate 18 is freely movable along the inner surface of each spacer block 13, and therefore can be easily moved by the inertia after receiving the pushing force of the projecting rod 27. . For this reason, with the 2nd protrusion pin 20, the molded article 1 can be extruded only 2nd distance toward a fixed mold | type. Thereby, the molded product 1 can be peeled off from the first projecting pins 19 staying at the first distance, and the molded product 1 can be easily released. At this time, the second return pin 24 is also movable toward the fixed mold by the second distance.

  Thereafter, as shown in FIG. 2C, the projecting rod 27 returns and the first projecting plate 17 is pushed back by the first distance by the urging force of the return spring 23. At this time, the separation restricting pin 21 also returns the second protruding plate 18 by the first distance, and the molded product 1 held only by the second protruding pin 20 is almost certainly released. In this way, an injection molded product can be manufactured. At this time, the first return pin 22, the second return pin 24, and the sprue protrusion pin 25 are also returned by the first distance. Further, as shown in FIG. 2D, when the fixed mold and the movable mold 11 are closed, the second return pin 24 is pushed back by the fixed length of the separation restricting pin 21 by the fixed mold. Thereby, the 2nd protrusion plate 18 is also pushed back and the movable mold | type 11 returns to an original state.

  Thus, the injection mold 10 has a simple structure in which the second projecting pin 20 can be moved to the second distance by inertia using the inertia of continuing to move without having a complicated internal structure. Thus, the molded product 1 can be easily released, and the manufacturing cost can be reduced. Moreover, since the structure is simple, troubles are unlikely to occur during the production of the molded article 1, and the running cost can be reduced.

FIG. 3 shows an injection mold and an injection molded product manufacturing method according to the second embodiment of the present invention.
As shown in FIG. 3, the injection mold 30 has a fixed mold (not shown) and a movable mold 11. The fixed mold and the movable mold 11 are provided so as to be openable and closable so as to form a cavity for forming the molded product 1 therein.
In the following description, the same members as those in the first embodiment of the present invention are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 3, the movable mold 11 includes a movable mounting plate 12, a spacer block 13, a receiving plate 14, a movable mold plate 15, a core 16, a first projecting plate 17, a second projecting plate 18, and a first projecting. A pin 19, a second projecting pin 20, a separation regulating pin 21, a first return pin 22, a return spring 23, a second return pin 24, a sprue projecting pin 25, and a guide pin 26 are provided.

In the separation restricting pin 21, the moving portion 21 b is formed longer by a predetermined second distance than the thickness of the plate on the fixed mold side of the first protruding plate 17. When the first projecting plate 17 and the second projecting plate 18 are separated from each other by a second distance, the separation restricting pin 21 has a first projecting shape due to the head 21a hitting the plate on the fixed mold side of the first projecting plate 17. The distance between the plate 17 and the second projecting plate 18 cannot be increased beyond the second distance.
Further, the first return pin 22 and the return spring 23 constitute a return member, and only the first protruding plate 17 can be pushed back while the second protruding plate 18 is left as it is.

  In the injection mold 30, when the molded product 1 formed in the cavity is released, first, the movable mold 11 is separated from the fixed mold to open the cavity. Thereafter, as shown in FIG. 3A, the first projecting plate 17 is pushed and moved by the projecting rod 27 of the molding machine by a first distance toward the core surface 16a, that is, toward the fixed mold. Thus, the second protruding plate 18 is moved by the first distance together with the first protruding plate 17 toward the fixed mold, and the molded product 1 is moved toward the fixed mold by the first protruding pin 19 and the second protruding pin 20. It can be pushed out by distance. At this time, the first return pin 22, the second return pin 24, and the sprue protruding pin 25 also move toward the fixed mold by the first distance.

  If it has moved by the first distance, as shown in FIG. 3 (b), the protruding rod 27 returns and the first protruding plate 17 is pushed back by the second distance by the urging force of the return spring 23. At this time, since the return spring 23 pushes back only the first projecting plate 17 while leaving the second projecting plate 18 as it is, the second projecting pin 20 is held in an extruded state, and only the first projecting pin 19 is retained. You can retract only 2 distances. Thereby, the molded product 1 can be peeled off from the retracted first projecting pin 19, and the molded product 1 can be easily released. At this time, the first return pin 22 and the sprue protrusion pin 25 are also returned by the second distance.

  Thereafter, as shown in FIG. 3C, the first protruding plate 17 is pushed back to the first distance by the urging force of the return spring 23. At this time, the separation restricting pin 21 returns the second projecting plate 18 by a distance obtained by subtracting the second distance from the first distance, and the molded product 1 held only by the second projecting pin 20 is almost certainly released. To do. In this way, an injection molded product can be manufactured. At this time, the first return pin 22, the second return pin 24, and the sprue protruding pin 25 are also returned by the same distance. Further, as shown in FIG. 3D, when the fixed mold and the movable mold 11 are closed, the second return pin 24 is pushed back by the fixed mold by the second distance. Thereby, the 2nd protrusion plate 18 is also pushed back and the movable mold | type 11 returns to an original state.

  As described above, the injection mold 30 has a simple structure that allows the second protruding pin 20 to be held in an extruded state by utilizing the inertia of stopping even without having a complicated internal structure. The molded product 1 can be easily released, and the manufacturing cost can be reduced. Moreover, since the structure is simple, troubles are unlikely to occur during the production of the molded article 1, and the running cost can be reduced.

  The injection mold 10 according to the first embodiment of the present invention and the injection mold 30 according to the second embodiment of the present invention release the molded product 1 almost certainly by a single extrusion operation. Therefore, the number of protrusions can be reduced. For this reason, the molding cycle time can be shortened, and it can contribute to the extension of the life of the mold centering on the protruding mechanism, the first protruding pin 19, the second protruding pin 20, and the core 16 through which they penetrate. . Further, by reducing the number of protrusions, the noise reduction effect can be enhanced as the scale of the production base increases.

Conventionally, in order to increase the mold release efficiency of the molded product 1, the number of ejections has been increased or the speed has been increased. However, according to the injection molding die 10 and the injection molding die 30, the number of ejections is increased. There is no need to increase the speed.
Note that the injection mold 10 and the injection mold 30 are the same, and depending on the use conditions, the operation of the injection mold 10 or the operation of the injection mold 30 is both. It may be a complex operation. The combined operation is an operation realized by pushing back only the first protruding plate 17 by the return spring 23 when the second protruding plate 18 does not move to the second distance of the injection mold 10. .

  As shown in FIG. 4, the injection mold 10 and the injection mold 30 are formed on the tip of the first projecting pin 19 such that a part of the molded product 1 can be formed. The same shape 19a as a part of the shape may be processed. In this case, a part of the molded product 1 can be easily peeled off from the first protruding pin 19. In particular, even if it is difficult to release a part of the shape of the molded product 1 by processing the same shape 19a as a part of the shape of the molded product 1, it is easily pulled from the first protruding pin 19. Can be peeled off. Further, it can be easily applied to the case where the second projecting pin 20 is engraved and deliberately engraved for identification marking of the molded product 1 or the like.

  Furthermore, as shown in FIG. 5, the injection mold 10 and the injection mold 30 are provided with an elastic body 21 d such as a rubber ring on the surface of the head 21 a of the separation regulating pin 21 on the moving part 21 b side. It may be. In this case, the impact and noise when the head 21a of the separation restricting pin 21 and the first protruding plate 17 collide can be reduced. Further, the elastic body 21d is compressed and repelled, so that minute vibrations can be generated and the protruding effect can be enhanced.

It is a longitudinal cross-sectional view which shows the movable mold | type of the injection mold of the 1st Embodiment of this invention. It is a longitudinal cross-sectional view which shows the injection molded product manufacturing method shown in FIG. It is a longitudinal cross-sectional view which shows the injection molded product manufacturing method of the 2nd Embodiment of this invention. It is (a) longitudinal cross-sectional view which shows the modification of the 1st protrusion pin of the injection die of the 1st and 2nd embodiment of this invention, (b) It is an expanded longitudinal cross-sectional view of a part. It is a longitudinal cross-sectional view which shows the modification of the isolation | separation control pin of the injection mold of the 1st and 2nd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Molded product 10 Injection mold 11 Movable mold 12 Movable side mounting plate 13 Spacer block 14 Receiving plate 15 Movable side mold plate 16 Core 17 First projecting plate 18 Second projecting plate 19 First projecting pin 20 Second projecting pin 21 Separation Restriction Pin 22 First Return Pin 23 Return Spring 24 Second Return Pin 25 Sprue Projection Pin 26 Guide Pin 27 Projection Rod

Claims (4)

It has a fixed mold and a movable mold that can be opened and closed with each other so as to form a cavity for forming a molded product inside,
The movable type is
A core surface facing the cavity;
A first protruding plate provided on the back side of the core surface so as to be movable a predetermined distance with respect to the core surface;
One or more integrally provided on the first projecting plate so as to pass through the core surface and push the molded product toward the fixed mold when the first projecting plate moves toward the core surface. A first protruding pin;
When the first projecting plate moves to the core surface side by the predetermined distance, the first projecting plate is pushed by the first projecting plate and moved away from the first projecting plate by inertia to move to the core surface side. A second projecting plate disposed between the plate and the core surface;
When the second projecting plate moves toward the core surface, the molded product is pushed out toward the fixed mold through the core surface and separated from the first projecting pin so as to be integrated with the second projecting plate. Having one or more second projecting pins provided,
Characteristic injection mold. It has a fixed mold and a movable mold that can be opened and closed with each other so as to form a cavity for forming a molded product inside,
The movable type is
A core surface facing the cavity;
A first protruding plate provided on the back side of the core surface so as to be movable a predetermined distance with respect to the core surface;
One or more integrally provided on the first projecting plate so as to pass through the core surface and push the molded product toward the fixed mold when the first projecting plate moves toward the core surface. A first protruding pin;
When the first projecting plate moves to the core surface side by the predetermined distance, the first projecting plate and the core surface are pushed by the first projecting plate and movable to the core surface by the predetermined distance. A second projecting plate disposed between
One or more integrally provided on the second projecting plate so as to pass through the core surface and push the molded product toward the fixed mold when the second projecting plate moves toward the core surface. A second protruding pin;
A return member that urges the first projecting plate away from the second plate toward the opposite side of the core surface.
Characteristic injection mold. In an injection mold having a fixed mold and a movable mold that are openable and closable and that form a cavity for molding a molded product inside when closed, the movable mold includes a core surface facing the cavity A first projecting plate provided on the back side of the core surface, one or more first projecting pins provided integrally with the first projecting plate, and between the first projecting plate and the core surface. A second projecting plate disposed on the first projecting plate, and one or more second projecting pins provided integrally with the second projecting plate,
While pushing the first projecting plate toward the core surface and moving it by a predetermined distance, the core surface is penetrated by one or a plurality of first projecting pins, and the molded product is pushed out toward the fixed mold, By pushing the second projecting plate by the first projecting plate and moving it away from the first projecting plate by inertia to the core surface side, the core surface is penetrated by one or a plurality of second projecting pins. Having a step of extruding the molded product toward the fixed mold and separating from the first protruding pin,
A method for producing an injection molded product. In an injection mold having a fixed mold and a movable mold that are openable and closable and that form a cavity for molding a molded product inside when closed, the movable mold includes a core surface facing the cavity A first projecting plate provided on the back side of the core surface, one or more first projecting pins provided integrally with the first projecting plate, and between the first projecting plate and the core surface. A second projecting plate disposed on the first projecting plate, and one or more second projecting pins provided integrally with the second projecting plate,
While pushing the first projecting plate toward the core surface and moving it by a predetermined distance, the core surface is penetrated by one or a plurality of first projecting pins, and the molded product is pushed out toward the fixed mold, By pushing and moving the second projecting plate toward the core surface by the first projecting plate, the molded product is moved toward the fixed mold by penetrating the core surface with one or more second projecting pins. After the extrusion, the first projecting plate moved toward the fixed mold is urged to the opposite side of the core surface side and returned away from the second plate, whereby the first projecting pin is removed from the molded product. Having a step of releasing,
A method for producing an injection molded product.

Images