Annular part injection molding mold and using method

Abstract

The invention discloses an annular part injection molding mold and a using method, the annular part injection molding mold comprises a lower mold, an upper mold, a first mold core and a second mold core, the lower mold is connected with the upper mold, and the first mold core and the second mold core are arranged on the lower mold. Through the arrangement of the detachable mold core I and the mold core II, the mold core I and the mold core II are firstly taken out after mold opening in a forming process, and then the annular part is taken out, so that the annular part can be prevented from being damaged, and the qualified rate of product production is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding, and in particular relates to an annular part injection molding mold and a use method thereof. Background Art

[0002] An annular sealing gasket part is a fluorosilicone rubber part with a concave inner wall. Since the annular inner cavity of the part is annularly concave, the part cannot be removed from the mold core after injection molding using a traditional single-core mold structure. If the part is forcibly pried open and demolded using external force, the part structure is easily damaged and a qualified product part cannot be obtained. Therefore, in order to improve the qualified rate of the part production, a mold that does not damage the part during demolding is needed.

[0003] The patent document with the announcement number CN216329723U discloses an easy-to-remove mold for an injection molded part with an inner groove, wherein a horizontal through hole is provided on the cavity wall of the male mold, and a horizontal telescopic block with a molded protrusion at its outer end is movably provided in the horizontal through hole, and the horizontal telescopic block is matched with a linkage telescopic mechanism. The linkage telescopic mechanism drives the horizontal telescopic block to extend and press against the inner wall of the injection molded part to form an inner groove, and retracts so that the injection molded part will not be hindered from being removed from the mold during demoulding, and the injection molded part will not be damaged. However, the mold structure is relatively complex, and the preparation cost is high when used on a large scale. At the same time, the horizontal telescopic block needs to be operated, which affects the production efficiency to a certain extent.

[0004] The patent document with the announcement number CN216914632U discloses an LED bracket packaging mold. When the plastic material is injected around the metal sheet to form the injection molding part, the sealing structure isolates the injection molding part from the upper functional area and the lower functional area to prevent the plastic material from entering the upper functional area and the lower functional area to damage the function. It can also avoid the work process of removing the glue from the functional area after the pressing is completed, thereby reducing the production cost. Although the patent is divided into an upper mold and a lower mold, there is no structure in the injection molding part for forming the inner concave part of the inner wall. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a ring-shaped part injection molding mold and a use method.

[0006] The present invention is achieved through the following technical solutions.

[0007] The present invention provides an annular part injection molding die, comprising a lower die, an upper die, a core 1 and a core 2, wherein the lower die is connected to the upper die, the core 1 and the core 2 are arranged on the lower die, the core 1 is provided with a molding surface A, and the core 2 is provided with a molding surface B.

[0008] Preferably, a lower model cavity A is arranged on the lower mold, a lower model cavity B is arranged on one side of the lower model cavity A, and a lower model cavity C is arranged on the other side of the lower model cavity A.

[0009] Preferably, a socket A is provided on the lower mold, the socket A is provided inside the lower mold cavity A, and a groove A is provided on the side wall of the lower mold.

[0010] Preferably, an overflow sink cavity and a placement platform are provided on the lower mold, the overflow sink cavity is provided on the outside of the lower model cavity A, a discharge port is provided at the end of the overflow sink cavity, a socket B and a guide column are provided on the placement platform, and the guide column is provided on the socket B.

[0011] Preferably, an upper model cavity A is arranged on the upper mold, and an upper model cavity B, an upper model cavity C, an upper model cavity D and an upper model cavity E are arranged on the side wall of the upper model cavity A in sequence from the outside to the inside.

[0012] Preferably, the upper mold is provided with a plug hole C, a groove B and a groove C, and the groove B and the groove C are provided on the side wall of the upper mold.

[0013] Preferably, two cores are arranged in mirror image, a protruding nail A is arranged on core one, and the molding surface A is arranged on one side wall of the core.

[0014] Preferably, two mirror images of the core 2 are provided, a protruding nail B is provided on the core 2, and the molding surface B is provided on the side wall of the core 2.

[0015] A method for using a ring-shaped part injection molding mold comprises the following steps:

[0016] S1: Load the mold upright into the machine tool;

[0017] S2: Fill the ring part preparation material into the upper mold cavity A, and place core 1 and core 2 in the upper mold;

[0018] S3: close the mold and carry out the forming process;

[0019] S4: Open the mold, take out the core 1, core 2, annular parts and excess materials as a whole, then take out the excess material in the middle of core 2, then take out core 2, then take out core 1, and finally take out the annular parts;

[0020] S5: Deburring and cleaning the annular parts.

[0021] Preferably, the step S3 comprises: applying pressure of 5 to 20 MPa to close the lower mold and the upper mold, and performing a forming process at a temperature and pressure of 100 to 300° C. for 4 to 20 minutes.

[0022] The beneficial effects of the present invention are:

[0023] The present invention arranges the detachable core 1 and core 2. After the mold is opened in the forming process, the core 1 and core 2 are taken out first, and then the annular part is taken out, so that the damage of the annular part can be avoided and the qualified rate of product production is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the lower mold and core 1 and core 2 of the present invention;

[0026] Figure 3 It is a structural schematic diagram of the lower mold of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the upper mold of the present invention;

[0028] Figure 5 It is a structural schematic diagram of a core 1 of the present invention;

[0029] Figure 6 It is a structural schematic diagram of the core 2 of the present invention;

[0030] Figure 7 It is a front view of the annular part of the present invention;

[0031] Figure 8 is a cross-sectional view of the annular part of the present invention along AA;

[0032] In the figure: 1-annular part, 100-lower mold, 101-lower model cavity A, 104-jack A, 105-overflow sink cavity, 106-guide column, 107-groove A, 108-placing platform, 109-discharge port, 110-jack B, 200-upper mold, 201-upper model cavity B, 202-upper model cavity C, 203-upper model cavity D, 204-upper model cavity E, 205-upper model cavity A, 206-jack C, 207-groove B, 208-groove C, 300-core one, 301-convex nail A, 302-surface A, 400-core two, 401-convex nail B, 402-surface B. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0034] Embodiment 1:

[0035] like Figures 1 to 8 As shown, a ring-shaped part injection molding mold includes a lower mold 100, an upper mold 200, a core 1 300 and a core 2 400, wherein the lower mold 100 is connected to the upper mold 200, the core 1 300 and the core 2 400 are arranged on the lower mold 100, the core 1 300 is provided with a molding surface A302, and the core 2 400 is provided with a molding surface B402.

[0036] The lower mold 100 is provided with a lower mold cavity A101, a lower mold cavity B102 is provided on one side of the lower mold cavity A101, and a lower mold cavity C103 is provided on the other side of the lower mold cavity A101. The combination of the lower mold cavity A101, the lower mold cavity B102 and the lower mold cavity C103 is consistent with the shape of the bottom surface of the annular part 1 and the rounded corner portion of the bottom surface edge.

[0037] The lower mold 100 is provided with a socket A104, and the socket A104 is provided inside the lower mold cavity A101. The side wall of the lower mold 100 is provided with a groove A107, and a plurality of grooves A107 are provided to reduce the mass of the lower mold 100.

[0038] The lower mold 100 is provided with an overflow sinking cavity 105 and a placement platform 108, the overflow sinking cavity 105 is arranged outside the lower mold cavity A101, and a discharge port 109 is arranged at the end of the overflow sinking cavity 105, and the placement platform 108 is provided with a plug hole B110 and a guide column 106, and the guide column 106 is arranged on the plug hole B110, and the core 1 300 and the core 2 400 are arranged on the placement platform 108. The plug hole B110 is used for inserting the convex nail A301 and the convex nail B401.

[0039] The upper mold 200 is provided with an upper mold cavity A205, and the side wall of the upper mold cavity A205 is provided with an upper mold cavity B201, an upper mold cavity C202, an upper mold cavity D203 and an upper mold cavity E204 from the outside to the inside, and the upper mold cavity B201, the upper mold cavity C202, the upper mold cavity D203 and the upper mold cavity E204 are all annular. The combination of the upper mold cavity A205, the upper mold cavity B201, the upper mold cavity C202, the upper mold cavity D203 and the upper mold cavity E204 is consistent with the shape of the outer side wall, the top surface and the rounded corner part of the top surface edge of the annular part 1.

[0040] The upper mold 200 is provided with a plug hole C206, a groove B207 and a groove C208. The guide pillar 106 can be inserted into the plug hole C206 to guide the upper mold 200 and the lower mold 100 when the mold is closed. The groove B207 and the groove C208 are arranged on the side wall of the upper mold 200. A plurality of grooves B207 are arranged to reduce the mass of the upper mold 200. The grooves C208 are symmetrically arranged at two locations to facilitate the discharge of the material from the discharge port 109 and avoid the accumulation of the material in the overflow sink cavity 105.

[0041] The core 1 300 is provided with two mirror images, and the two cores 1 300 form a disc-shaped structure object. The core 1 300 is provided with a convex nail A301, and the molding surface A302 is provided on the side wall of the core 1 300.

[0042] The core 2 400 is provided with two mirror images, and the two cores 2 400 may not contact each other. The width of the gap between the two cores 2 400 should be sufficient to allow the annular part 1 to be removed when it is sleeved. A convex nail B401 is provided on the core 2 400, and the molding surface B402 is provided on the side wall of the core 2 400.

[0043] The length of the convex nail A301 and the convex nail B401 is relatively small, and they can be taken out at an angle when core 1 300 and core 2 400 are removed. The annular part 1 is an annular rubber part and can be slightly deformed to a certain extent. The tilted taking action will not damage the annular part 1. The profile A302 and the profile B402 are consistent in shape with the inner wall and the concave part of the annular part 1.

[0044] A method for using a ring-shaped part injection molding mold comprises the following steps:

[0045] S1: Place the side of the mold parallel to the horizontal plane and load it upright into the machine tool;

[0046] S2: Fill the ring part preparation material into the upper mold cavity A205, and place the core 1 300 and the core 2 400 in the upper mold 200;

[0047] S3: close the mold and carry out the forming process;

[0048] S4: Open the mold, take out the core 1 300, the core 2 400, the annular part 1 and the excess as a whole, then take out the excess material in the middle of the core 2 400, then take out the core 2 400, then take out the core 1 300, and finally take out the annular part 1;

[0049] S5: Deburr the annular part 1 and clean it with water until no surface stains or material debris remain.

[0050] The step S3 includes: applying pressure of 5 MPa to close the lower mold 100 and the upper mold 200, and performing a forming process at 100° C. and keeping the temperature and pressure for 4 minutes, wherein the forming process is injection molding. After closing the mold, the internal cavity formed by the lower mold 100, the upper mold 200, the core 1 300 and the core 2 400 is consistent with the shape of the annular part 1, and the formed cavity scaling coefficient is 1.0.

[0051] Example 2

[0052] The structure of a ring-shaped part injection molding mold is exactly the same as that of Example 1, except that:

[0053] A method for using a ring-shaped part injection molding mold comprises the following steps:

[0054] S1: Place the side of the mold parallel to the horizontal plane and load it upright into the machine tool;

[0055] S2: Fill the ring part preparation material into the upper mold cavity A205, and place the core 1 300 and the core 2 400 in the upper mold 200;

[0056] S3: close the mold and carry out the forming process;

[0057] S4: Open the mold, take out the core 1 300, the core 2 400, the annular part 1 and the excess as a whole, then take out the excess material in the middle of the core 2 400, then take out the core 2 400, then take out the core 1 300, and finally take out the annular part 1;

[0058] S5: Deburr the annular part 1 and clean it with water until no surface stains or material debris remain.

[0059] The step S3 includes: applying pressure of 20 MPa to close the lower mold 100 and the upper mold 200, and performing a forming process at 300° C. and keeping the temperature and pressure for 20 minutes, wherein the forming process is injection molding. After closing the mold, the internal cavity formed by the lower mold 100, the upper mold 200, the core 1 300 and the core 2 400 is consistent with the shape of the annular part 1, and the formed cavity scaling factor is 1.5.

[0060] Example 3

[0061] The structure of a ring-shaped part injection molding mold is exactly the same as that of Example 1, except that:

[0062] A method for using a ring-shaped part injection molding mold comprises the following steps:

[0063] S1: Place the side of the mold parallel to the horizontal plane and load it upright into the machine tool;

[0064] S2: Fill the ring part preparation material into the upper mold cavity A205, and place the core 1 300 and the core 2 400 in the upper mold 200;

[0065] S3: close the mold and carry out the forming process;

[0066] S4: Open the mold, take out the core 1 300, the core 2 400, the annular part 1 and the excess as a whole, then take out the excess material in the middle of the core 2 400, then take out the core 2 400, then take out the core 1 300, and finally take out the annular part 1;

[0067] S5: Deburr the annular part 1 and clean it with water until no surface stains or material debris remain.

[0068] The step S3 includes: applying a pressure of 12 MPa to close the lower mold 100 and the upper mold 200, and performing a forming process at 220° C. and a pressure of 9 minutes, wherein the forming process is injection molding. After closing the mold, the internal cavity formed by the lower mold 100, the upper mold 200, the core 1 300 and the core 2 400 is consistent with the shape of the annular part 1, and the formed cavity scaling factor is 1.3.

[0069] 100 annular parts 1 were prepared respectively by the mold and method of Examples 1-3, and the demolding damage of the annular parts 1 was 0, which shows that the mold can avoid the occurrence of demolding damage.

Claims

1. A ring-shaped part injection molding mold, characterized in that: The invention comprises a lower mold (100), an upper mold (200), a core one (300) and a core two (400), wherein the lower mold (100) is connected to the upper mold (200), the core one (300) and the core two (400) are arranged on the lower mold (100), a molding surface A (302) is arranged on the core one (300), and a molding surface B (402) is arranged on the core two (400).

2. The annular part injection molding mold according to claim 1, characterized in that: A lower model cavity A (101) is arranged on the lower mold (100), a lower model cavity B (102) is arranged on one side of the lower model cavity A (101), and a lower model cavity C (103) is arranged on the other side of the lower model cavity A (101).

3. The annular part injection molding mold according to claim 2, characterized in that: The lower mold (100) is provided with an insertion hole A (104), the insertion hole A (104) is arranged inside the lower mold cavity A (101), and a groove A (107) is arranged on the side wall of the lower mold (100).

4. The annular part injection molding mold according to claim 2, characterized in that: The lower mold (100) is provided with an overflow sink cavity (105) and a placement platform (108); the overflow sink cavity (105) is arranged outside the lower mold cavity A (101); a discharge port (109) is arranged at the end of the overflow sink cavity (105); a socket B (110) and a guide column (106) are arranged on the placement platform (108); and the guide column (106) is arranged on the socket B (110).

5. The annular part injection molding mold according to claim 1, characterized in that: An upper model cavity A (205) is arranged on the upper mold (200), and an upper model cavity B (201), an upper model cavity C (202), an upper model cavity D (203) and an upper model cavity E (204) are arranged on the side wall of the upper model cavity A (205) in sequence from the outside to the inside.

6. The annular part injection molding mold according to claim 1, characterized in that: The upper mold (200) is provided with an insertion hole C (206), a groove B (207) and a groove C (208), and the groove B (207) and the groove C (208) are provided on the side wall of the upper mold (200).

7. The annular part injection molding mold according to claim 1, characterized in that: The core one (300) is provided with two mirror images, a protruding nail A (301) is provided on the core one (300), and the molding surface A (302) is provided on the side wall of the core one (300).

8. The annular part injection molding mold according to claim 1, characterized in that: The core 2 (400) is provided with two mirror images, a protruding nail B (401) is provided on the core 2 (400), and the molding surface B (402) is provided on the side wall of the core 2 (400).

9. A method for using the annular part injection molding mold according to claim 1, characterized in that: The following steps are involved: S1: Load the mold upright into the machine tool; S2: Filling the ring-shaped part preparation material into the upper mold cavity A (205), placing the core 1 (300) and the core 2 (400) on the upper mold (200); S3: close the mold and carry out the forming process; S4: Open the mold, remove the core 1 (300), the core 2 (400), the annular part (1) and the excess material as a whole, then remove the excess material in the middle of the core 2 (400), then remove the core 2 (400), then remove the core 1 (300), and finally remove the annular part (1); S5: Deburring and cleaning the annular part (1).

10. The method for using the annular part injection molding mold according to claim 9, characterized in that: The step S3 comprises: applying pressure of 5 to 20 MPa to close the lower mold (100) and the upper mold (200), and performing a forming process at a temperature of 100 to 300° C. and a pressure of 4 to 20 minutes.

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