Insert pin for injection mold

Abstract

The insert pin comprises an insert pin body and a plunger, a small-diameter section is arranged at one end of the insert pin body, a first limiting step is formed between the small-diameter section and the insert pin body, a plunger hole site is arranged on the side wall of the small-diameter section, the plunger is matched in the plunger hole site, a stainless steel nut is matched on the small-diameter section, and a second limiting step is formed between the plunger and the small-diameter section. And one end of the stainless steel nut is stopped at the first limiting step, and under the action of the plunger spring, the wave bead can abut against the inner side wall of the stainless steel nut, so that the stainless steel nut is smoothly clamped on the insert pin during injection molding and cannot float up and down due to injection molding pressure.

Description

Technical Field

[0001] This utility model relates to molds, specifically to injection molds. Background Technology

[0002] The product comes with several nuts, which need to be placed in a mold and injection molded together during production. Because there is no female mold core to hold the top surface of the stainless steel nuts in place, the nuts may float up and down due to the injection pressure during molding. Utility Model Content

[0003] The technical problem solved by this utility model is that the stainless steel nut placed in the mold floats up and down during product injection molding.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an insert for injection molds, comprising an insert body and a plunger, one end of the insert body is provided with a small diameter section, a first limiting step is formed between the small diameter section and the insert body, a plunger hole is provided on the side wall of the small diameter section, the plunger is fitted in the plunger hole, a stainless steel nut is fitted on the small diameter section, one end of the stainless steel nut stops at the first limiting step, and the plunger ball presses against the inner side wall of the stainless steel nut under the action of the plunger spring, positioning the stainless steel nut on the small diameter section.

[0005] Under the action of the plunger spring, the ball will press against the inner wall of the stainless steel nut, so that the stainless steel nut can be smoothly locked on the insert during injection molding and will not float up and down due to injection pressure.

[0006] There are two plungers on the small diameter section, and the two plungers are oriented in opposite directions. For example, the glass ball of one plunger is located on the left side of the small diameter section, and the glass ball of the other plunger is located on the right side of the small diameter section. In this way, the stainless steel nut can be more stable on the pin than a single plunger.

[0007] The two plungers are arranged in parallel on the small diameter section, that is, the two plungers are staggered on the small diameter section. This makes it easier to select plungers of appropriate size and also helps to ensure the strength of the small diameter section.

[0008] The other end of the insert body is provided with a large diameter section, and a second limiting step is formed between the large diameter section and the insert body. The insert is fitted in the insert hole of the female mold core, and the large diameter section is fitted in the countersunk hole of the insert hole.

[0009] Compared with the prior art, the present invention has the following beneficial effects: it reduces the problem of nuts floating up due to injection pressure during injection molding of injection molded parts, and the problem of nuts falling off and products being defective due to excessive clearance between the nut and the insert pin caused by the fit tolerance of the nut during insertion. The present invention can greatly improve the occurrence of similar situations and increase the product yield. Attached Figure Description

[0010] The present invention will be further described below with reference to the accompanying drawings:

[0011] Figure 1 This is a schematic diagram showing the combination of the insert pin and the stainless steel nut during injection molding;

[0012] Figure 2 for Figure 1 Exploded view;

[0013] Figure 3 This is a schematic diagram of the pin body 10 after it has been made transparent.

[0014] Explanation of symbols in the diagram:

[0015] 10. Pin body; 11. Small diameter section; 12. First limiting step; 13. Large diameter section; 14. Second limiting step;

[0016] 20. Plunger; 21. Bead;

[0017] 30. Stainless steel nuts;

[0018] 40. Injection molded products. Detailed Implementation

[0019] refer to Figures 1 to 3 A pin for injection molds includes a pin body 10 and a plunger 20. One end of the pin body is provided with a small diameter section 11. A first limiting step 12 is formed between the small diameter section and the pin body. A plunger hole is provided on the side wall of the small diameter section. The plunger fits in the plunger hole. A stainless steel nut 30 fits on the small diameter section. One end of the stainless steel nut stops at the first limiting step. The ball 21 of the plunger presses against the inner side wall of the stainless steel nut under the action of the plunger spring, positioning the stainless steel nut on the small diameter section.

[0020] The other end of the insert body 10 is provided with a large diameter section 13, and a second limiting step 14 is formed between the large diameter section and the insert body. The insert is fitted in the insert hole of the female mold core, and the large diameter section is fitted in the countersunk hole of the insert hole.

[0021] There are two plungers 20 on the minor diameter section 11, and the two plungers are oriented in opposite directions. The two plungers 20 are arranged in parallel on the minor diameter section 11.

[0022] In actual production, the small-diameter section 11 of the insert protrudes from the inner wall of the mold core and extends into the mold cavity. The stainless steel nut 30 is fitted onto the small-diameter section 11 and is tightened by the plunger 20. When liquid plastic is injected into the mold cavity, the stainless steel nut 30 will not float up or down due to the injection pressure. After the product is molded, the stainless steel nut 30 is fixedly embedded in the product.

[0023] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A pin for injection molds, comprising a pin body (10) and a plunger (20), characterized in that: A small diameter section (11) is provided at one end of the needle body. A first limiting step (12) is formed between the small diameter section and the needle body. A plunger hole is provided on the side wall of the small diameter section. The plunger fits in the plunger hole. A stainless steel nut (30) fits on the small diameter section. One end of the stainless steel nut stops at the first limiting step. The plunger ball (21) presses against the inner side wall of the stainless steel nut under the action of the plunger spring, positioning the stainless steel nut on the small diameter section.

2. The insert pin for injection molds as described in claim 1, characterized in that: The number of plungers (20) on the small diameter section (11) is two, and the two plungers are oriented in opposite directions.

3. The insert for injection molds as described in claim 2, characterized in that: Two plungers (20) are arranged in parallel on the small diameter section (11).

4. The insert pin for injection molds as described in claim 1, characterized in that: The other end of the insert body (10) is provided with a large diameter section (13), and a second limiting step (14) is formed between the large diameter section and the insert body. The insert is fitted in the insert hole of the female mold core, and the large diameter section is fitted in the countersunk hole of the insert hole.

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