JPH04117724U - injection mold - Google Patents

Abstract

(57) [Summary] (with amendments) [Purpose] To provide an injection mold that can be disassembled without damaging the easily damaged ejector pin during disassembly and cleaning, etc., and which eliminates the need for extra work. [Structure] The end portion 12s is attached to the core plate 3, and the body portion 12b is guided so as to be freely inserted in a third through hole portion 6d provided in the upper protrusion plate 6, and the head portion 12a is inserted from the body portion 12b. Step portion 12 formed over
A fixing member 12 is provided such that the fixing member 12 c comes into contact with the edge of the third through hole portion 6d, and is configured to resist the urging force of the urging means 8. With the above configuration, after opening the mold, the movable side mounting plate 11 is removed, and the ejector pin 5 and return pin 7 are connected to the upper ejector plate 6 and the lower ejector plate 9.
Lower protruding plate 9 from the integral part attached by
When removed, the fixing member acts against the biasing force of the biasing means, so the ejector pin 5 can be removed without being damaged.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to injection molds, and is particularly designed to disassemble the mold for maintenance and inspection. This invention relates to an injection mold.

0002

[Conventional technology]

A general example of a conventional injection mold will be explained with reference to the drawings. It is a front view with a section of the main part of the conventional injection mold, showing the ejector pin 5 and the return pin. The figure shows the broken surface along the center of the bolt 7 and fixing bolt 9a, and the state after disassembly. It is something that

0003 In Fig. 4, a cavity plate 2 is bolted to the fixed side mounting plate 1 and fixed. and is driven to come into contact with and away from this cavity plate 2. A cavity 4 is formed at the joint surface of the core plate 3. In order to protrude the finished product molded inside this cavity 4 to the outside, The tip of the pin 5 can protrude into the cavity 4, and Since it also forms part of the molding surface of A 4, in the first through hole portion 3d of the core plate 3. It is slidable and installed without any gaps.

0004 On the other hand, the return pin 7 has its tip connected to a second through hole provided in the core plate 3. 3a to be slidably provided, and a compression coil spring 8 is attached to the outside thereof. It is provided on the periphery. The other end portions of the return pin 7 and the ejecting pin 5 are as shown in the figure. These heads are integrally formed, and these heads are connected to the upper protruding plate 6 and the lower side. After sandwiching it between the protruding plates 9, it is attached integrally with the fixing bolt 9a. Ru.

[0005] Further, the above-mentioned compression coil spring 8 has an upper protruding plate 6 and a lower protruding plate 9. It is provided so as to urge the integral part of the core plate 3 away from the core plate 3. It functions to return the extraction pin 5 to the position at the time of molding. The assembly assembled as described above is applied to the repulsive force of the compression coil spring 8. Insert the return pin 7 into the second through hole 3a provided in the core plate 3 against the resistance. and carefully insert the ejector pin 5 into the first through hole 3d. The moving side mounting plate 11 is fixed to the spacer 10 using the fixing bolts 11a, and the mold is completed. It is something that can be achieved.

[0006] In the conventional injection mold with the above configuration, the mold is disassembled for maintenance inspection. In order to do this, the fixing bolt 11a must be removed as shown in Figure 4, but at this time The upper protrusion plate 6 and the lower protrusion are in contact with the movable mounting plate 11. The repulsive force of the compression coil spring 8 in the compressed state is suddenly applied to the integral body of the plate 9. act. As a result, the core plate 3 moves rapidly in the direction of the arrow in the figure. The return pin 7 that was inserted into the second through hole 3a and the first through hole 3 The ejector pin 5 inserted into the position d also moves rapidly.

[0007] During this rapid movement, the corners of the ejector pin 5, the inner peripheral surface of the first through hole 3d, etc. A violent collision occurs between the two, resulting in damage to the ejector pin 5. Sometimes. Therefore, as in the "injection mold" of Utility Model Publication No. 2-42369, the return pin Bolt the spacer to pin 7 to prevent damage to the ejector pin when disassembling the mold. Proposals have been made to stop it.

[0008] FIG. 5 is a cutaway front view of the main parts of the injection mold of Utility Model Publication No. 2-42369, This figure shows the mold being disassembled. In this figure, as already explained in Figure 4, Items that have already been explained are given the same numbers as in Figure 4, and explanations are omitted. Return pin 7 A threaded portion 7a is formed on the insertion side of the core plate 3. For maintenance and cleaning of this mold, open the mold as shown and press the return pin 7. After setting the spacer 33 to the threaded portion 7a, screw the bolt 34 together. As a result, even if the movable side mounting plate 11 is removed, the repulsive force of the compression coil spring 8 is increased. This prevents the side projecting plate 6 and the lower projecting plate 9 from acting all at once on the integral body. It has stopped.

[0009] After doing this, remove the lower protruding plate 9 as shown, and then Carefully pull out the ejector pin 5 from the upper ejector plate 6 and core plate 3 and separate it. After cleaning and returning to the original insertion position, the lower protruding plate 9 is fixed.

0010

[Problem that the idea aims to solve]

However, after the above disassembly and cleaning, the bolt 34 and spacer 33 are returned. Since it is screwed to pin 7, remove bolt 34 and spacer 33. There is a problem in that it requires extra work. Therefore, the injection mold of the present invention was developed in view of the above-mentioned problems. The purpose of this is to remove easily damaged scratches during disassembly and cleaning of injection molds. Injection molding that can be disassembled without damaging the extraction pin and requiring no extra work. Our goal is to provide shape molds.

[0011]

[Means to solve the problem]

In order to achieve the above-mentioned problems and objectives, the injection mold of the present invention has the following structure. Prepare for success. In other words, the cavity plate on the fixed side and the The cavity is placed on the separation surface between the movable core plate and the movable core plate, which can freely come into contact with and separate from each other. An ejector pin is provided at the front for ejecting the product to be molded within the cavity. The protruding portion is slidably fitted in the first through-hole portion of the core plate. The pin and return pin are integrally attached using the upper and lower protruding plates. At the same time, the tip of the return pin is inserted into a second through hole provided in the core plate. The upper protruding plate and the lower protruding plate are provided slidably in the co-coat. The injection mold is equipped with a biasing means for biasing away from the upplate. The end portion is attached to the core plate, and the body portion is attached to the upper butt. It is guided so that it can be inserted freely in the third through hole provided in the extension plate, and The stepped portion formed from the top to the head abuts at the edge of the third through hole portion. A fixing member is provided to resist the biasing force of the biasing means.

0012 Also, preferably, the biasing means is provided around the outer periphery of the return pin. The fixing member is a compression coil spring, and the fixing member is a bolt having a threaded portion at the end. I have to.

[0013]

[Effect]

With the above configuration, after opening the mold, the movable side mounting plate is removed and the ejector pin is removed. The pin and return pin are integrally installed using an upper and lower ejecting plate. When the lower protruding plate is removed from the integrated object, the fixing member resists the biasing force of the biasing means. The ejector pin can be removed without damaging it.

[0014]

【Example】

A preferred embodiment of the present invention will be described below with reference to the drawings. Figure 1 is the actual It is a front view with a cross section of the main part of the injection molding mold of the example, and the ejector pin 5 and the return If the pin 7, the fixing bolt 9a, and the through bolt 12 break at the fracture surfaces along the respective centers, This also shows what it looks like after the mold is closed.

[0015] In this figure, the cavity plate 2 is bolted to the fixed side mounting plate 1 and fixed. and is driven to come into contact with and away from this cavity plate 2. A cavity 4 is formed on the joint surface of the core plate 3, which is located on the right side of the figure. The resin in a molten state is injected. In order to push out the finished product after molding and hardening in this cavity 4, The tip of the ejection pin 5 can protrude into the cavity 4, and Since a part of the molding surface of the bitty 4 is also formed by the tip of the pin, the part of the core plate 3 is 1. Provided so as to be able to slide freely in the through hole portion 3d, without any gaps, and on the same surface. It is.

[0016] On the other hand, the return pin 7 has its tip connected to a second through hole provided in the core plate 3. 3a so as to be slidable, and a compression coil spring 8 is provided. It is provided on its outer circumferential surface. At the other end of the return pin 7 and the ejecting pin 5, Heads as shown in the figure are each integrally formed, and these heads are pushed out from the upper side by a plate 6. and the lower protruding plate 9, and then integrally attached with the fixing bolt 9a. I'm wearing it.

[0017] Moreover, this compression coil spring 8 is connected to an upper ejecting plate 6 and a lower ejecting plate 9. It is provided so as to bias the integrated object away from the core plate 3, and the integrated object is When the object comes into contact with the movable side mounting plate 11 as shown in the figure, the ejector pin 5 is It functions to return it to its original position. On the other hand, a third through hole 3d is formed in the upper protruding plate 6, and An insertion hole 9h concentric with the third through hole 3d is formed in the lower protruding plate 9. has been done. Further, a threaded portion 3g having the same central axis as the third through hole portion 3d is further provided. It is formed on the core plate 3, and the threaded portion 12s of the through bolt 12 is It can be fixed by screwing it together.

[0018] This through-bolt 12 has a head 12a shown in the figure that fits within the insertion hole 9h, and The body portion 12b has sufficient clearance within the third through hole portion 6d of the upper protrusion plate 6. The stepped portion 12c is inserted through the third through hole portion 6 of the upper protrusion plate 6. It is provided in contact with the edge of d. FIG. 2 is a front view of the main part of the injection mold shown in FIG. 1 taken in a different plane; Open the product 100 shown in broken lines and push it out from the cavity 4 using the push-out pin 5. It shows how it was drawn out. When the mold is opened like this, the compression coil spring 8 is placed in a compressed state, while return pin 7 is extended as shown. This type In the open state, only the head 12a of the through bolt 12 is inserted into the insertion hole of the lower protruding plate 9. It protrudes outward from the portion 9h.

[0019] FIG. 3 is a cross-sectional view of the main parts showing the disassembled state of the injection mold shown in FIG. Fix the movable side mounting plate 11 of the injection mold assembled as follows with the bolt 11. a After removing the other parts, remove the fixing bolts 9a from the lower ejector plate 9 and attach the upper ejector plate. It shows how it is removed from 6. In this disassembled state, the stepped portion 12c of the through bolt 2 is located at the edge of the third through hole portion 6d. Since it is hooked to the upper part, the repulsive force of the compression coil spring 8 causes the upper part to The extraction plate 6 is prevented from popping out. In this state, the core plate 3 Carefully pull out the ejector pin 5 whose tip is fitted into the first through hole 3d provided. can be extracted.

[0020] In this way, the ejected pin 5 is inspected and cleaned, and the first through hole portion 3 Clean inside d. After this, carefully insert the ejector pin 5 into the first through hole 3d. , then fix the lower protruding plate 9 using fixing bolts 9a (Fig. 1), Fix the movable side mounting plate 11 to the spacer 10 using the fixing bolts 11a, and then attach the mold. It is something to be completed.

[0021] When disassembling the injection mold for maintenance and inspection in the injection mold with the above configuration, Since the repulsive force of the compression coil spring 8 in the compressed state does not act all at once, there is no risk of damage. A violent collision occurs between the easily ejected corner of the pin 5 and the inner peripheral surface of the first through hole 3d. As a result, the ejector pin 5 will not be damaged. In addition, although the above-mentioned embodiment used the through bolt 12 as a fixing member, it is not limited to this. The point is to prevent the upper protruding plate 6 from popping out when the lower protruding plate 9 is removed. What is necessary is to provide a latching portion on the fixing member so that the device can be rotated.

[0022] Furthermore, to simplify the explanation, an ejector pin 5, a return pin 7, a compression coil Although only one spring 8 is provided and the cavity 4 has a simple shape, this Of course, the shape of the ejecting pin 5 depends on the shape of the cavity 4. Any number of return pins 7 and compression coil springs 8 may be provided. Four sets are usually provided.

[0023]

[Effect of the idea] As explained above, according to the present invention, when disassembling and cleaning an injection mold, Ejector pins that easily stick can be disassembled without being damaged, and no extra work is required. It is possible to provide an injection mold.

[Brief explanation of drawings]

FIG. 1 is a front view illustrating a main part of an injection molding mold according to an example in cross section.

FIG. 2 is a front view of a main part of the injection mold shown in FIG. 1 taken in a different plane;

FIG. 3 is a cross-sectional view of the main parts of the injection mold of FIG. 1, showing an exploded state.

FIG. 4 is a cross-sectional front view of a main part of a conventional injection mold.

FIG. 5 is a front view with a main part cut away of the injection mold of Utility Model Publication No. 2-42369.

[Explanation of symbols]

1 Fixed side mounting plate 2 Cavity plate 3 Core plate 3a Second through hole part 3d First through hole part 4 Cavity 5 Eject pin 6 Upper protruding plate 6d Third through hole part 7 Return pin 8 Compression coil spring 9 Lower protruding plate 10 Spacer 11 Movable side mounting plate 12 Through bolt

Claims (2)

[Scope of utility model registration request] 1. A cavity is provided at a separation surface between a stationary cavity plate and a movable core plate that can freely come into contact with and separate from the cavity plate,
An ejector pin for ejecting a product molded within the cavity is slidably fitted in the first through hole of the core plate, and the ejector pin and return pin are arranged on an upper ejector plate and a lower ejector plate. Therefore, the return pin is integrally attached, and the tip of the return pin is slidably provided in a second through hole provided in the core plate, and the upper and lower protruding plates are separated from the core plate. An injection molding mold having an end portion attached to the core plate and a body portion inserted through a third through hole provided in the upper ejecting plate. A fixing member is provided that is freely guided and has a stepped portion formed from the body portion to the head portion that comes into contact with an edge of the third through hole portion to resist the urging force of the urging means. An injection mold characterized by being configured as follows. 2. The return pin according to claim 1, wherein the biasing means is a compression coil spring provided around the outer periphery of the return pin, and the fixing member is a bolt having a threaded portion formed at the end thereof. Injection mold.