Insert positioning mechanism for injection mold

Abstract

The present invention relates to an insert positioning mechanism for an injection mold, comprising a movable mold, a fixed mold and an insert, wherein the insert is formed with an internal thread, the movable mold comprises a movable mold insert, the fixed mold comprises a fixed mold base plate, a mounting hole is formed in the fixed mold, a positioning assembly is arranged in the mounting hole, the insert is sleeved on the positioning assembly, and when the movable and fixed molds are closed, the insert is inserted into the movable mold insert. The positioning assembly comprises an insert pin and a spring sleeved on the insert pin. Compared with the prior art, the positioning assembly in the present invention positions the insert with size error when it is inserted into the movable mold insert, ensuring that the insert is inserted into the movable mold insert accurately, preventing the insert from being too short to be inserted into place, thereby preventing the product from having flash after molding, affecting the appearance and use of the product; or preventing the insert from being too long to be inserted excessively, thereby damaging the movable mold insert and the insert.

Description

Technical Field

[0001] The invention relates to an insert positioning mechanism of an injection mold, belonging to the technical field of injection molds. Background Art

[0002] An insert is a kind of accessory embedded in plastic. Before injection molding, the insert is inserted into the movable mold insert, and after the product is formed, the insert is embedded in the product. However, the above production process has very high requirements on the precision of the insert to avoid the gap between the insert and the movable mold insert, which will cause flash after the product is formed. Some inserts produced by the prior art have problems of inaccurate precision and dimensional errors, but if these inserts are discarded, it will cause a lot of waste. Summary of the invention

[0003] The object of the present invention is to provide an insert positioning mechanism for an injection mold for positioning an insert when the insert is inserted into a movable mold insert block in view of the disadvantages of the prior art.

[0004] To achieve the purpose, the technical solution adopted by the present invention is:

[0005] The insert positioning mechanism of the injection mold comprises a movable mold, a fixed mold and an insert, wherein the insert is provided with an internal thread, the movable mold comprises a movable mold insert, the fixed mold comprises a fixed mold base plate, a mounting hole is provided in the fixed mold, a positioning component is arranged in the mounting hole, the insert is sleeved on the positioning component, and when the movable and fixed molds are closed, the insert is inserted into the movable mold insert.

[0006] As a further optimization of the above technical solution: the mounting hole includes a large hole and a small hole, a positioning step is formed between the large hole and the small hole, the positioning assembly includes an insert pin and a spring sleeved on the insert pin, the insert pin is provided with positioning blocks protruding to both sides, the positioning block is located in the large hole and contacts with the positioning step, the spring is located in the large hole, one end of the spring contacts with the positioning block, and the other end contacts with the fixed mold base plate, one end of the insert pin passes through the small hole and is sleeved on the insert.

[0007] As a further optimization of the above technical solution: when the movable mold and the fixed mold are closed, there is a certain gap between the other end of the insert pin and the fixed mold base plate.

[0008] As a further optimization of the above technical solution: when the movable mold and the fixed mold are closed, the distance between the other end of the insert pin and the fixed mold base plate is 1 mm.

[0009] As a further optimization of the above technical solution: one end of the inlay pin passes through the small hole and is formed with a protrusion, the insert is sleeved on the protrusion, the entire protrusion is located in the insert, and there is a certain distance between the end of the protrusion and the end of the insert.

[0010] As a further optimization of the above technical solution: the distance between the end of the protrusion and the end of the insert is 1 mm.

[0011] As a further optimization of the above technical solution: the part where the insert pin is connected to the protrusion is a transition section, the two side surfaces of the transition section are made into guiding slopes, the transition section passes through the mounting hole, and the end of the transition section can be inserted into the insert.

[0012] As a further optimization of the above technical solution: the maximum length of the transition section inserted into the insert is 0.5 mm.

[0013] Compared with the prior art, the positioning assembly in the present invention positions the process of inserts with size errors being inserted into the movable mold block, ensuring that the inserts are accurately inserted into the movable mold block, and preventing the inserts from being too short to be inserted into place, resulting in burrs after product molding, affecting the appearance and use of the product; or the inserts from being too long to be inserted excessively, resulting in damage to the movable mold block and the insert. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention.

[0015] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure at point A in the middle. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Figure 1-2As shown, the insert positioning mechanism of the injection mold includes a movable mold, a fixed mold 2 and an insert 6, and the insert 6 is formed with an internal thread. The movable mold includes a movable mold insert 1, and the fixed mold 2 includes a fixed mold base plate 3. A mounting hole 21 is formed in the fixed mold 2, and a positioning component is arranged in the mounting hole 21. The mounting hole 21 includes a large hole and a small hole, and a positioning step 22 is formed between the large hole and the small hole. The positioning component includes an insert pin 4 and a spring 5 sleeved on the insert pin 4, and a positioning block 41 protruding to both sides is formed on the insert pin 4. The positioning block 41 is located in the large hole and contacts the positioning step 22. The spring 5 is located in the large hole, one end of the spring 5 contacts the positioning block 41, and the other end contacts the fixed mold base plate 3. When the movable and fixed molds 2 are closed, there is a certain gap between the end of the insert pin 4 and the fixed mold base plate 3, so that the insert 6 has space to float up and down. If the size of the insert 6 is accurate, then when the insert 6 is inserted into the movable mold insert 1 and snapped into place, the movable and fixed molds 2 are just molded. However, if the length of the insert 6 is too long, after the insert 6 is snapped into place, the movable and fixed molds 2 are not molded, and the fixed mold 2 continues to squeeze the insert 6, which causes damage to the movable mold insert 1 and the insert 6, affecting the injection molding. In the present invention, the insert pin 4 and the spring 5 are provided to prevent the fixed mold 2 from directly squeezing the insert 4. After the insert 6 is snapped into place, the fixed mold 2 continues to drive the insert pin 4 to move downward. At this time, the spring 5 is squeezed, and the insert pin 4 moves toward the fixed mold base plate 3 until the movable and fixed molds 2 are molded, preventing the insert 6 from being squeezed again after being snapped into place and causing damage. When the mold is opened, the elastic force of the spring 5 is released, and the insert pin 4 is reset to the state where the positioning block 41 contacts the positioning step 22. The fixed mold 2 drives the insert pin 4 to move upward synchronously, and the insert 6 is embedded in the product during injection molding, and does not move with the insert pin 4. The insert pin 4 gradually separates from the insert 6. Figure 1 , 2 It is a schematic diagram of the structure in which the insert 6 with precise dimensions cooperates with the positioning assembly, the movable mold and the fixed mold 2.

[0017] In the above technical solution: when the movable mold and the fixed mold 2 are closed, the distance between the end of the insert pin 4 and the fixed mold base plate 3 is 1 mm.

[0018] In the above technical solution: one end of the insert pin 4 passes through the small hole and is formed with a protrusion 44, and the insert 6 is sleeved on the protrusion 44. The entire protrusion 44 is located inside the insert 6, and there is a certain distance between the end of the protrusion 44 and the end of the insert 6, so as to avoid that the length of the insert 6 is too short, one end of the protrusion 44 passes through the insert 6 and contacts with the movable mold insert 1, resulting in the insert 6 being unable to be inserted into place.

[0019] In the above technical solution: the distance between the end of the protrusion 44 and the end of the insert 6 is 1 mm.

[0020] In the above technical solution: the part where the insert pin 4 is connected to the protrusion 44 is the transition section 42, and the two side surfaces of the transition section 42 are formed into guiding slopes 43. The transition section 42 passes through the mounting hole 21. When the insert 6 is of accurate size or too long, the movable and fixed molds 2 are closed, and the end of the transition section 42 is gradually inserted into the insert 6; when the insert 6 is too short, the transition section 42 will not be inserted into the insert 6. When closing the mold, the transition section 42 squeezes the insert 6 to ensure that the insert 6 and the movable mold insert 1 are inserted in place, and prevent the insert 6 from being too short and unable to be inserted into the movable mold insert 1, resulting in flash after the product is formed, affecting the appearance and use of the product. The guiding slope 43 facilitates the insertion of the transition section 42 into the insert 6 and also facilitates the separation of the transition section 42 from the insert 6.

[0021] In the above technical solution, the maximum length of the transition section 42 inserted into the insert 6 is 0.5 mm.

[0022] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should fall within the protection scope of the present invention.

Claims

1. An insert positioning mechanism for an injection mold, comprising a movable mold, a fixed mold (2) and an insert (6), wherein the insert (6) is provided with an internal thread, the movable mold comprises a movable mold insert (1), and the fixed mold (2) comprises a fixed mold base plate (3), characterized in that The fixed mold (2) is provided with a mounting hole (21), a positioning assembly is arranged in the mounting hole (21), the insert (6) is sleeved on the positioning assembly, and when the movable and fixed molds (2) are closed, the insert (6) is inserted into the movable mold insert (1); The mounting hole (21) comprises a large hole and a small hole, a positioning step (22) is formed between the large hole and the small hole, the positioning assembly comprises an insert pin (4) and a spring (5) sleeved on the insert pin (4), the insert pin (4) is provided with a positioning block (41) protruding on both sides, the positioning block (41) is located in the large hole and contacts the positioning step (22), the spring (5) is located in the large hole, one end of the spring (5) contacts the positioning block (41), and the other end contacts the fixed mold base plate (3), one end of the insert pin (4) passes through the small hole and sleeves the insert (6); When the movable and fixed molds (2) are closed, a certain gap exists between the other end of the insert pin (4) and the fixed mold base plate (3); One end of the insert pin (4) passes through the small hole and is provided with a convex block (44), the insert (6) is sleeved on the convex block (44), the entire convex block (44) is located inside the insert (6), and there is a certain distance between the end of the convex block (44) and the end of the insert (6); The portion where the insert pin (4) is connected to the protrusion (44) is a transition section (42). The two side surfaces of the transition section (42) are formed into guiding inclined surfaces (43). The transition section (42) passes through the mounting hole (21), and the end of the transition section (42) can be inserted into the insert (6).

2. The insert positioning mechanism of the injection mold according to claim 1, characterized in that When the movable and fixed molds (2) are closed, the distance between the other end of the insert pin (4) and the fixed mold base plate (3) is 1 mm.

3. The insert positioning mechanism of the injection mold according to claim 1, characterized in that The distance between the end of the protrusion (44) and the end of the insert (6) is 1 mm.

4. The insert positioning mechanism for an injection mold according to claim 1, characterized in that The maximum length of the transition section (42) inserted into the insert (6) is 0.5 mm.

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