Secondary injection mold structure for plastic metal part

Abstract

The utility model discloses a plastic metal piece secondary injection mold structure which comprises a lower mold block and an upper mold block, a plurality of lower forming cavities are formed in the edge portion of the top face of the lower mold block, the upper mold block is pressed against the top face of the lower mold block, a plurality of upper forming cavities are formed in the bottom face of the upper mold block, and the lower forming cavities and the corresponding upper forming cavities form forming cavities. An outer rubber part on the outer side and a metal part in the middle can be fixed, and a plastic part with another color is injected between the outer rubber part on the outer side and the metal part in the middle, so that the outer rubber part, the metal part and the plastic part are firmly connected, do not easily fall off and are tightly matched with each other, and the effect is good.

Description

Technical field:

[0001] The utility model relates to the technical field of injection molding equipment, and more specifically to a secondary injection mold structure for plastic and metal parts. Background technology:

[0002] In the existing two-color metal-plastic parts, generally, the metal part and two plastic parts are separately injection molded, and then the three parts are assembled. During this connection process, due to the difference in the precision of the mold, the three parts are not tightly matched, that is, the metal and plastic are assembled separately, resulting in a loose fit, and are easy to loosen after use, and the firmness is not high;

[0003] Therefore, some existing methods are that after the injection molded parts are injection molded, the staff assembles them together with the metal parts, glues the joints, and then presses and fixes them to ensure that the two are firmly connected. However, since adhesives are used, there is still a risk of degumming in the later stage, which affects the service life. Utility model content:

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a secondary injection mold structure for plastic and metal parts, which can fix the outer rubber part on the outside and the metal part in the middle, and inject a plastic part of another color between the outer rubber part on the outside and the metal part in the middle, so that the three are firmly connected and not easy to fall off, and the three are closely matched with each other, and the effect is good.

[0005] The solution of the utility model to solve the technical problem is:

[0006] A secondary injection mold structure for a plastic metal part, comprising a lower mold block and an upper mold block, wherein a plurality of lower molding cavities are formed on the edge of the top surface of the lower mold block, the top surface of the lower mold block is pressed against the upper mold block, a plurality of upper molding cavities are formed on the bottom surface of the upper mold block, and the lower molding cavities and the corresponding upper molding cavities form a molding cavity;

[0007] A through hole extending downward is formed in the middle of the bottom surface of the lower molding cavity, and a center positioning column is inserted into the through hole. The outer wall of the center positioning column is close to the inner wall of the through hole. A center mounting column extending upward is formed in the middle of the top surface of the center positioning column. The center mounting column is in the molding cavity. A metal ring is inserted on the outer side of the center mounting column. The inner wall of the metal ring cooperates with the outer wall of the center mounting column. An outer rubber part is installed on the edge of the molding cavity.

[0008] A plurality of feed holes are formed on the top surface of the upper molding cavity, the bottom of the injection molding feed tube is located in the corresponding feed hole, the bottom outer wall of the injection molding feed tube is tightly attached to the inner wall of the corresponding feed hole, and the bottom discharge port of the injection molding feed tube faces the molding cavity between the outer rubber part and the metal ring.

[0009] A middle recessed hole extending upward is formed in the middle of the top surface of the upper molding cavity, and the top end of the central mounting column is inserted into the middle recessed hole.

[0010] The beneficial effects of the utility model are:

[0011] 1. It can fix the outer rubber part on the outside and the metal part in the middle, and inject a plastic part of another color between the outer rubber part on the outside and the metal part in the middle, so that the three are firmly connected and not easy to fall off, and the three are closely matched with each other, and the effect is good.

[0012] 2. Three feeding through holes are formed on the top surface of its upper molding cavity, so that each molding cavity is fed by three injection molding feeding pipes, with good injection molding effect, fast feeding and fast injection molding. Description of the drawings:

[0013] Figure 1 It is a partial structural schematic diagram of the entire mold structure installed in the utility model;

[0014] Figure 2 It is a partial cross-sectional view of the utility model;

[0015] Figure 3 This is a partial bottom view of the upper module. Specific implementation method:

[0016] For example, see Figures 1 to 3 (In order to make other components of this embodiment clear, the section lines of all drawings are omitted) as shown, a secondary injection mold structure of a plastic metal part includes a lower module 10 and an upper module 20, the lower module 10 is fixed on the lower template 1, the upper module 20 is fixed on the upper template 2, the top surface edge of the lower module 10 is formed with a plurality of lower molding cavities 11 (four lower molding cavities 11 in this embodiment), the top surface of the lower module 10 is pressed against the upper module 20, and the bottom surface of the upper module 20 is formed with a plurality of upper molding cavities 21, and the lower molding cavities 11 and the corresponding upper molding cavities 21 form a molding cavity;

[0017] A through hole 12 extending downward is formed in the middle of the bottom surface of the lower molding cavity 11, and a center positioning column 30 is inserted into the through hole 12. A radial extension portion is formed on the bottom outer wall of the center positioning column 30, and the radial extension portion is inserted into an annular groove formed on the inner wall of the bottom end of the through hole 12, so that it is fixed on the lower template 1, and the outer wall of the center positioning column 30 is close to the inner wall of the through hole 12. An upwardly extending center mounting column 31 is formed in the middle of the top surface of the center positioning column 30, and the center mounting column 31 is in the molding cavity. A metal ring 100 is inserted on the outer side of the center mounting column 31, and the inner wall of the metal ring 100 cooperates with the outer wall of the center mounting column 31. An outer rubber part 200 is installed on the edge of the molding cavity.

[0018] Furthermore, a plurality of feed holes are formed on the top surface of the upper molding cavity 21, the bottom of the injection molding feed tube 40 is located in the corresponding feed hole, the bottom outer wall of the injection molding feed tube 40 is tightly attached to the inner wall of the corresponding feed hole, and the bottom discharge port of the injection molding feed tube 40 faces the molding cavity between the outer rubber part 200 and the metal ring 100.

[0019] In this embodiment, three feeding through holes are formed on the top surface of the upper molding cavity 21 , and the three feeding through holes are evenly distributed on the top surface of the upper molding cavity 21 with the central axis of the upper molding cavity 21 as the center.

[0020] Furthermore, a middle recessed hole 22 extending upward is formed in the middle of the top surface of the upper molding cavity 21 , and the top end of the central mounting column 31 is inserted into the middle recessed hole 22 .

[0021] Furthermore, the bottom end surface of the metal ring 100 is pressed against the top surface of the central positioning column 30, and the top end surface of the metal ring 100 is pressed against the middle top surface of the upper molding cavity.

[0022] Furthermore, a plurality of vertical material pushing holes 13 are formed on the bottom surface of the edge of the lower molding cavity 11, and a material pushing rod 14 is inserted into the vertical material pushing hole 13, and the outer side wall of the material pushing rod 14 is in close contact with the inner side wall of the corresponding vertical material pushing hole 13. The bottom of the material pushing rod 14 extends out of the corresponding vertical guide hole on the lower mold plate 1 and is fixed on the lifting plate 50 below. By lifting the lifting plate 50, the material pushing rod 14 can be lifted, so that the molded part in the molding cavity can be pushed. It is a conventional structure and will not be described in detail here.

[0023] Specifically, the lower module 10 is fixed on the lower template 1 , and the upper module 20 is fixed on the upper template 2 .

[0024] When this embodiment is used, the metal ring 100 is firstly put on the central mounting column 31, so that the inner wall of the metal ring 100 is closely attached to the outer side of the central mounting column 31, and at the same time, the outer rubber member 200 is placed on the edge of the lower molding cavity 11, and the two are matched, and then the upper mold block 20 is lowered so that it is pressed against the top surface of the lower mold block 10 to achieve closure;

[0025] Then, the material is discharged through the bottom outlet of all injection molding feed pipes 40 to inject into the molding cavity between the outer rubber part 200 and the metal ring 100. After completion, the upper module 20 is lifted, and the injection molded part is pushed out from the top of the vertical pushing hole 13 by the top of the pushing rod 14 to complete the unloading.

[0026] It can fix the outer rubber part 200 and the middle metal part 100, and inject a plastic part of another color between the outer rubber part 200 and the middle metal part 100, so that the three are firmly connected and not easy to fall off, and the three are closely matched with good effect.

Claims

1. A secondary injection mold structure for a plastic metal part, comprising a lower mold block (10) and an upper mold block (20), characterized in that: The top edge of the lower module (10) is formed with a plurality of lower molding cavities (11), the top surface of the lower module (10) is pressed against the upper module (20), the bottom surface of the upper module (20) is formed with a plurality of upper molding cavities (21), and the lower molding cavities (11) and the corresponding upper molding cavities (21) form a molding cavity; A through hole (12) extending downward is formed in the middle of the bottom surface of the lower molding cavity (11), a center positioning column (30) is inserted into the through hole (12), the outer wall of the center positioning column (30) is tightly attached to the inner wall of the through hole (12), a center installation column (31) extending upward is formed in the middle of the top surface of the center positioning column (30), the center installation column (31) is in the molding cavity, a metal ring (100) is inserted on the outer side of the center installation column (31), the inner wall of the metal ring (100) is matched with the outer wall of the center installation column (31), and an outer rubber part (200) is installed on the edge of the molding cavity.

2. A secondary injection mold structure for a plastic metal part according to claim 1, characterized in that: A plurality of feed holes are formed on the top surface of the upper molding cavity (21), the bottom of the injection molding feed pipe (40) is located in the corresponding feed hole, the bottom outer wall of the injection molding feed pipe (40) is in close contact with the inner wall of the corresponding feed hole, and the bottom discharge port of the injection molding feed pipe (40) faces the molding cavity between the outer rubber part (200) and the metal ring (100).

3. The secondary injection mold structure of a plastic metal part according to claim 1, characterized in that: A middle recessed hole (22) extending upward is formed in the middle of the top surface of the upper molding cavity (21), and the top end of the central mounting column (31) is inserted into the middle recessed hole (22).

4. The secondary injection mold structure of a plastic metal part according to claim 1, characterized in that: The bottom end surface of the metal ring (100) is pressed against the top surface of the central positioning column (30), and the top end surface of the metal ring (100) is pressed against the middle top surface of the upper molding cavity ().

5. The secondary injection mold structure of a plastic metal part according to claim 1, characterized in that: The bottom surface of the edge of the lower molding cavity (11) is formed with a plurality of vertical material pushing holes (13), and a material pushing rod (14) is inserted into the vertical material pushing holes (13), and the outer side wall of the material pushing rod (14) is tightly attached to the inner side wall of the corresponding vertical material pushing hole (13).

6. The secondary injection mold structure of a plastic metal part according to claim 1, characterized in that: The lower module (10) is fixed on the lower template (1), and the upper module (20) is fixed on the upper template (2).

7. The secondary injection mold structure of a plastic metal part according to claim 2, characterized in that: Three feeding through holes are formed on the top surface of the upper molding cavity (21), and the three feeding through holes are evenly distributed on the top surface of the upper molding cavity (21) with the central axis of the upper molding cavity (21) as the center.

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