Injection mold fixed mold side spring block demoulding mechanism

Abstract

The ejector mechanism of the fixed mold side of the injection mold comprises an upper composite plate and a lower composite plate, a fixed mold plate is arranged under the upper composite plate, a fixed mold insert is arranged under the fixed mold plate, a through hole is provided in the lower composite plate, a mold foot is arranged on the lower composite plate, an upper ejector plate, a lower ejector plate and an ejector are arranged on the lower composite plate between the mold feet, an ejector rod of the injection molding machine passes through the through hole and contacts with the lower ejector plate, a movable mold plate is arranged on the mold foot, a movable mold insert and a side core-pulling slider are arranged on the movable mold plate, a plastic part is arranged between the fixed mold insert, the movable mold insert and the side core-pulling slider, a lower groove is arranged at the lower part of the plastic part, the lower groove cooperates with the movable mold insert, a side groove is arranged on the outer wall of the right side of the plastic part, a convex angle is arranged on the upper part of the side groove, an ejector block is arranged under the fixed mold plate, one side of the ejector block cooperates with the side groove, the ejector block slides with the fixed mold plate through a limit sliding structure, a first oblique guide hole is provided in the ejector block, a fixed column is arranged on the movable mold plate, an oblique guide rod is arranged on the fixed column, and the oblique guide rod cooperates with the first oblique guide hole.

Description

Technical Field

[0001] The invention relates to an injection mold, in particular to a demoulding mechanism of a spring block on a fixed mold side of the injection mold. Background Art

[0002] When using injection molds to produce plastic parts, such as the upper body frame of the left / right front door of a car, due to its complex structure, core pulling is required in four directions: up, down, left, and right. The existing method is usually to design the side of the plastic part close to the center of the mold into a relatively straight structure. In this way, when the mold is opened, the components on the movable mold side can drive the plastic part to move directly downward, so that the plastic part can be ejected from the fixed mold plate downward, and the plastic part can be ejected and demolded smoothly. As customer demands increase, in order to increase the three-dimensional sense of plastic parts and make their appearance more beautiful, it is necessary to design a side groove on the side of the plastic part close to the center of the mold, and design a convex angle structure on the side groove. The side groove and convex angle make it impossible for the plastic part to be ejected when the mold is opened. Therefore, it is necessary to design an internal core-pulling structure in the mold to first remove the side groove and convex angle. The existing method is usually to set an internal core-pulling slider on the movable template, arrange an inclined ejector structure on the upper and lower ejector pin plates, and the inclined ejector rod of the inclined ejector structure passes through the movable template to drive the internal core-pulling slider. After the mold is opened, the plastic part is ejected upward and demolded. At the same time, the inclined ejector rod of the inclined ejector structure passes through the movable template to drive the internal core-pulling slider to push up with the plastic part and move inward, so that it can be ejected from the side groove and convex angle of the plastic part. However, for some injection molds with very compact internal dynamic templates (the internal dynamic template is usually full of various cooling water channels and other ejection structures of straight ejector rod perforations, inclined ejector rod perforations, etc.), there is not enough space on one side of the movable template to arrange the inclined ejector rod perforations, resulting in the plastic part being unable to be demolded smoothly. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a core pulling structure that occupies less space in the movable template, which is conducive to the arrangement of more cooling water channels and other structures in the movable template, ensuring that the plastic parts can be demolded smoothly.

[0004] The technical scheme of the ejection mechanism of the fixed mold side spring block of the injection mold of the present invention is as follows: it comprises an upper composite plate and a lower composite plate, a fixed mold plate is arranged under the upper composite plate, a fixed mold insert is arranged under the fixed mold plate, a through hole is opened in the lower composite plate, a mold foot is arranged on the lower composite plate, an upper ejector plate, a lower ejector plate and an ejector are arranged on the lower composite plate between the mold feet, an ejector rod of the injection molding machine passes through the through hole and contacts with the lower ejector plate, a movable mold plate is arranged on the mold foot, a movable mold insert and a side core-pulling slider are arranged on the movable mold plate, a mold cavity is formed between the fixed mold insert, the movable mold insert and the side core-pulling slider, a plastic part molded by injection molding is arranged in the mold cavity, a lower groove is arranged at the lower part of the plastic part, and the lower groove is connected to the movable mold insert In coordination, a side groove is provided on the outer wall of the right side of the plastic part, a convex angle is arranged on the upper part of the side groove, a spring block is arranged under the fixed template, one side of the spring block cooperates with the side groove, the spring block slides with the fixed template through a limiting sliding structure, the limiting sliding structure includes a limiting block arranged under the fixed template, protruding side sliding blocks are arranged on both sides of the spring block, the side sliding blocks slide with the limiting block, a first oblique guide hole is opened in the spring block, a fixed column is arranged on the movable template, an oblique guide rod is arranged on the fixed column, the oblique guide rod cooperates with the first oblique guide hole, an oblique guide bar is arranged under the fixed template, an oblique guide groove is opened on the top of the spring block, and the oblique guide bar cooperates with the oblique guide groove.

[0005] Furthermore, there are two groups of the first oblique guide holes, and there are two corresponding fixing columns and oblique guide rods.

[0006] Furthermore, the cross section of the first oblique guide hole is rectangular, and the corresponding cross sections of the fixing column and the oblique guide rod are rectangular.

[0007] Furthermore, a wear-resistant pad is arranged under the oblique guide rod.

[0008] Furthermore, an inclined guide column is arranged under the fixed template, a second inclined guide hole is opened in the side core-pulling slider, and the inclined guide column cooperates with the second inclined guide hole.

[0009] The beneficial effect of the ejection mechanism of the fixed mold side spring block of the injection mold of the present invention is: since both sides of the plastic part need to be cored out, and one side is close to the center of the mold, there is not enough space in the movable mold plate to set the inclined top structure, so by setting the spring block under the fixed mold plate, the inclined guide rod on the fixed column cooperates with the first inclined guide hole of the spring block, and the limit block cooperates with the side slide block of the spring block, while the mold is gradually opened, the spring block can move inward to extract the side grooves and convex corners of the plastic part, and the core pulling structure occupies less space in the movable mold plate, which is conducive to the arrangement of more cooling water channels and other structures in the movable mold plate, ensuring that the plastic part can be demolded smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the ejection mechanism of the fixed mold side spring block of the injection mold of the present invention;

[0011] Figure 2 yes Figure 1A local enlarged schematic diagram of point A;

[0012] Figure 3 It is a three-dimensional schematic diagram of the cooperation state between the side slide blocks and the limit blocks on both sides of the spring block;

[0013] Figure 4 yes Figure 3 A local enlarged schematic diagram of point B;

[0014] Figure 5 yes Figure 3 A local enlarged schematic diagram of point C;

[0015] Figure 6 It is a three-dimensional schematic diagram of setting side grooves and convex corners on a plastic part.

[0016] In the attached drawings: 1. upper plate; 2. lower plate; 3. fixed plate; 4. fixed mold insert; 6. perforation; 7. mold foot; 8. upper ejector plate; 9. lower ejector plate; 10. ejector; 11. ejector rod of injection molding machine; 12. movable plate; 13. movable mold insert; 14. side core-pulling slider; 15. plastic part; 16. lower groove; 17. side groove; 18. convex corner; 19. spring block; 20. first oblique guide hole; 21. fixed column; 22. oblique guide rod; 23. wear-resistant pad; 24. limit block; 25. side slider; 26. oblique guide strip; 27. oblique guide groove; 28. oblique guide column; 29. ​​second oblique guide hole. DETAILED DESCRIPTION

[0017] The present invention relates to a mold ejection mechanism for a fixed mold side spring block of an injection mold. Figure 1 — Figure 6As shown, it includes an upper composite plate 1 and a lower composite plate 2, a fixed mold plate 3 is arranged under the upper composite plate 1, a fixed mold insert 4 is arranged under the fixed mold plate 3, a through hole 6 is opened in the lower composite plate 2, a mold foot 7 is arranged on the lower composite plate 2, an upper ejector plate 8, a lower ejector plate 9 and an ejector 10 are arranged on the lower composite plate 2 between the mold feet 7, an injection molding machine ejector rod 11 passes through the through hole 6 and contacts the lower ejector plate 9, a movable mold plate 12 is arranged on the mold foot 7, a movable mold insert 13 and a side core-pulling slider 14 are arranged on the movable mold plate 12, a mold cavity is formed between the fixed mold insert 4, the movable mold insert 13 and the side core-pulling slider 14, an injection-molded plastic part 15 is arranged in the mold cavity, a lower groove 16 is arranged at the lower part of the plastic part 15, the lower groove cooperates with the movable mold insert 13, and the right side outer wall of the plastic part 15 has a side Groove 17, a convex angle 18 is set on the upper part of the side groove 17, a spring block 19 is set under the fixed template 3, one side of the spring block 19 cooperates with the side groove 17, and the spring block 19 slides with the fixed template 3 through a limiting sliding structure. The limiting sliding structure includes a limiting block 24 set under the fixed template 3, protruding side sliders 25 are set on both sides of the spring block 19, and the side sliders 25 slide with the limiting block 24. A first inclined guide hole 20 is opened in the spring block 19, a fixed column 21 is set on the movable template 12, and an inclined guide rod 22 is set on the fixed column 21. The inclined guide rod 22 cooperates with the first inclined guide hole 20, and an inclined guide bar 26 is set under the fixed template 3. An inclined guide groove 27 is opened at the top of the spring block 19, and the inclined guide bar 26 cooperates with the inclined guide groove 27.

[0018] Furthermore, the first oblique guide holes 20 are in two groups, and the corresponding fixing columns 21 and oblique guide rods 22 are in two groups. The two groups of first oblique guide holes 20 cooperate with the two oblique guide rods 22, and the action is more stable and reliable.

[0019] Furthermore, the cross section of the first oblique guide hole 20 is rectangular, and the corresponding cross sections of the fixing column 21 and the oblique guide rod 22 are rectangular. The rectangular structure can be used to set a wear pad 23 on the lower side of the oblique guide rod 22, and it is also convenient to design the fixing column 21 into a lower vertical structure and an upper oblique structure.

[0020] Furthermore, a wear-resistant pad 23 is provided under the oblique guide rod 22. Since the lower part of the oblique guide rod 22 mainly cooperates with the inner wall of the first oblique guide hole 20 during mold opening and core pulling, the wear-resistant pad 23 is provided under the oblique guide rod 22 to increase its service life.

[0021] Furthermore, an inclined guide column 28 is disposed under the fixed template 3 , and a second inclined guide hole 29 is opened in the side core-pulling slider 14 , and the inclined guide column 28 matches the second inclined guide hole 29 .

[0022] The present invention discloses a mold release mechanism for a fixed mold side spring block of an injection mold. After a plastic part 15 is injection molded, a mold foot 7, an upper ejector plate 8, a lower ejector plate 9, an ejector pin 10, a movable mold plate 12, a movable mold insert 13, a side core-pulling slider 14, a fixed column 21 and a plastic part 15 are driven by a lower composite plate 2 to move downward together, while an upper composite plate 1, a fixed mold plate 3 and a fixed mold insert 4 remain stationary, and the mold is gradually opened from the fixed mold plate 3 and the movable mold plate 12. At this time, an inclined guide rod 22 on the fixed column 21 cooperates with a first inclined guide hole 20 of a spring block 19 below the fixed mold plate 3. Under the guiding action of the first inclined guide hole 20, the spring block 19 can move along the inclined direction of the inclined guide rod 22. At the same time, the spring block 19 moves along the inclined direction of the limit block 24 and the side slider 25, and along the inclined guide strip 26 and the inclined guide groove 27. The oblique direction movement (the oblique direction and angle of the oblique guide strip 26 and the oblique guide groove 27 are consistent with the oblique direction and angle of the limit block 24 and the side slider 25) allows the elastic block 19 to escape from the side groove 17 and the convex corner 18 on the right side of the plastic part 15 until the oblique guide rod 22 escapes from the first oblique guide hole 20. At the same time, the oblique guide column 28 cooperates with the second oblique guide hole 29 of the side core-pulling slider 14. Under the guidance of the oblique guide column 28, the side core-pulling slider 14 is pulled out of the left outer wall of the plastic part 15. After the core pulling is completed on both sides of the plastic part 15, the mold is completely opened. Finally, the injection molding machine ejector rod 11 passes through the through hole 6 to push the upper and lower ejector plates 8 and 9. The upper and lower ejector plates 8 and 9 drive the ejector 10. The ejector 10 passes through the movable plate 12 and the movable mold insert 13 to eject the plastic part 15 with the core pulling on both sides upward. In the present solution, the ejection mechanism of the fixed mold side spring block of the injection mold has a core pulling mechanism. Since both sides of the plastic part 15 need to be cored out, and one side is close to the center of the mold, there is not enough space in the movable mold plate 12 to set the inclined top structure. Therefore, an ejector block 19 is set under the fixed mold plate 3, and the inclined guide rod 22 on the fixed column 21 cooperates with the first inclined guide hole 20 of the ejector block 19, and the limit block 24 cooperates with the side slide block 25 of the ejector block 19. When the mold is gradually opened, the ejector block 19 can move inward to pull out the side groove 17 and the convex corner 18 of the plastic part 15. The core pulling structure occupies less space in the movable mold plate 12, which is conducive to the arrangement of more cooling water channels and other structures in the movable mold plate 12, ensuring that the plastic part 15 can be demolded smoothly.

Claims

1. A mold ejection mechanism for a fixed mold side spring block of an injection mold, comprising an upper composite plate (1) and a lower composite plate (2), a fixed mold plate (3) is arranged under the upper composite plate (1), a fixed mold insert (4) is arranged under the fixed mold plate (3), a through hole (6) is opened in the lower composite plate (2), a mold foot (7) is arranged on the lower composite plate (2), an upper ejector plate (8), a lower ejector plate (9) and an ejector (10) are arranged on the lower composite plate (2) between the mold foot (7), an injection molding machine ejector rod (11) passes through the through hole (6) and contacts the lower ejector plate (9), and the mold foot (7) is disposed on the upper ejector plate (8), a lower ejector plate (9) and an ejector pin (10) are disposed on the lower composite plate (2) between the mold foot (7), and an ejector pin (11) of the injection molding machine passes through the through hole (6) and contacts the lower ejector plate (9). A movable mold plate (12) is provided, and a movable mold insert (13) and a side core pull slider (14) are provided on the movable mold plate (12). A mold cavity is formed between the fixed mold insert (4), the movable mold insert (13) and the side core pull slider (14). A plastic part (15) is injection molded in the mold cavity. A lower groove (16) is provided at the lower part of the plastic part (15), and the lower groove cooperates with the movable mold insert (13). A side groove (17) is provided on the outer wall of the right side of the plastic part (15), and a convex corner (18) is provided at the upper part of the side groove (17). The invention is characterized in that: A spring block (19) is arranged under the fixed template (3), one side of the spring block (19) cooperates with the side groove (17), the spring block (19) slides with the fixed template (3) via a limit sliding structure, the limit sliding structure comprises a limit block (24) arranged under the fixed template (3), protruding side sliding blocks (25) are arranged on both sides of the spring block (19), the side sliding blocks (25) slide with the limit block (24), a first oblique guide hole (20) is opened in the spring block (19), a fixed column (21) is arranged on the movable template (12), an oblique guide rod (22) is arranged on the fixed column (21), the oblique guide rod (22) cooperates with the first oblique guide hole (20), an oblique guide bar (26) is arranged under the fixed template (3), an oblique guide groove (27) is opened at the top of the spring block (19), the oblique guide bar (26) cooperates with the oblique guide groove (27).

2. The ejection mechanism of the fixed mold side spring block of the injection mold according to claim 1, characterized in that: The first oblique guide holes (20) are provided in two groups, and the corresponding fixing columns (21) and oblique guide rods (22) are provided in two groups.

3. The ejection mechanism of the fixed mold side spring block of the injection mold according to claim 1, characterized in that: The cross section of the first oblique guide hole (20) is rectangular, and the corresponding fixed column (21) and oblique guide rod (22) have rectangular cross sections.

4. The ejection mechanism of the fixed mold side spring block of the injection mold according to claim 1, characterized in that: A wear-resistant pad (23) is arranged below the oblique guide rod (22).

5. The ejection mechanism of the fixed mold side spring block of the injection mold according to claim 1, characterized in that: An inclined guide column (28) is arranged under the fixed template (3), a second inclined guide hole (29) is opened in the side core-pulling slider (14), and the inclined guide column (28) cooperates with the second inclined guide hole (29).

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