A vertical shearing type semi-overflow molding structure

Abstract

The present invention discloses a vertical shearing type semi-flash molding structure, comprising an upper mold and a lower mold, wherein the cavity formed by the upper mold and the lower mold is arranged in accordance with the shape of the product, and the cavity is composed of the upper cavity of the upper mold and the lower cavity of the lower mold; the boundary of the upper cavity is provided with a vertical upper shearing surface, and the boundary of the lower cavity is provided with a vertical lower shearing surface, and the upper shearing surface and the lower shearing surface are arranged in parallel. The above-mentioned vertical shearing type semi-flash molding structure is more reasonable, and adopts a plug-in structure design, so that when the upper mold and the lower mold are closed, the force received by the closing mold is fully pressed on the material, ensuring that the material will not lose pressure.

Description

Technical Field

[0001] The invention relates to a vertical shearing type semi-overflow molding structure. Background Art

[0002] The semi-overflow molding process is embodied by using a semi-overflow mold, which is used for the compression molding of thermosetting plastics. The thermosetting plastic raw material that has not yet cross-linked and cured is placed in the lower mold of the mold, and then the upper mold moves downward and closes with the lower mold to press the thermosetting plastic raw material into a required shape. At the same time, after the mold is closed, the boundary of the mold cavity is not completely closed, and a part of the material needs to be allowed to overflow. By allowing the overflow, the gas in the mold cavity is discharged through the overflow channel, and at the same time, the molten material overflows through the boundary material and can flow more fully to the boundary, so that the material can completely fill the entire cavity, obtaining a final product with full material filling, no material shortage, and less trapped air; therefore, the semi-overflow molding process has the problem of molten material overflowing the cavity during the process. Phenomenon, and the amount of overflow can be controlled very small due to the characteristics of the mold structure, which can achieve the process advantages and not affect the process quality due to overflow. Therefore, this process is called semi-overflow molding process; the mold used in the semi-overflow molding process is called a semi-overflow mold; because when the upper and lower molds of the semi-overflow mold are closed to the part where the upper and lower molds begin to contact, there is a scissors-like shearing action at the boundary of the upper and lower molds. Therefore, the area where the upper and lower molds of the mold shear each other is called the shearing edge, the mold structure part of the shearing edge is called the mold shearing edge, and the product structure part of the shearing edge is called the product shearing edge. The quality of the product shearing edge design determines the structure of the mold shearing edge, and the structure of the mold shearing edge directly determines whether the advantages of the semi-overflow molding process can be successfully achieved.

[0003] The existing mold design is horizontal shear, which cannot achieve a semi-closed state with very little gap. After a short period of extrusion, the contact support or indirect support between the upper and lower molds reduces the pressure in the cavity, resulting in defects such as lack of material in the molded product, excessive pressure loss, poor appearance quality, and poor physical properties, and the molding effect cannot be guaranteed.

[0004] Therefore, it is necessary to improve the shear edge structure design of products in the prior art. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects in the prior art and provide a vertical shear type semi-overflow molding structure, which adopts a plug-in structure design so that when the upper mold and the lower mold are closed, all the forces exerted on the closing mold are applied to the material to ensure that the material will not lose pressure.

[0006] In order to achieve the above technical effect, the technical solution of the present invention is: a vertical shear type semi-flashing molding structure, comprising an upper mold (1) and a lower mold (2), wherein the mold cavity (3) formed by the upper mold (1) and the lower mold (2) is arranged in accordance with the shape of the product, and the mold cavity (3) is composed of an upper mold cavity (31) of the upper mold (1) and a lower mold cavity (32) of the lower mold (2); the boundary of the upper mold cavity (31) is provided with a vertical upper shear surface (12), and the boundary of the lower mold cavity (32) is provided with a vertical lower shear surface (22), and the upper shear surface (12) and the lower shear surface (22) are arranged in parallel. Through such a design, the purpose of vertical shear type semi-flashing can be achieved, and the force on the material to be shared by the upper mold and the lower mold when the mold is closed is avoided.

[0007] The preferred technical solution is that the outer edge of the upper cavity (31) is provided with an upper convex ring block (11) convex downwardly, and the upper shear surface (12) is the inner side wall (14) of the upper convex ring block (11); the outer edge of the lower cavity (32) is provided with a lower concave ring groove (21) concave downwardly, and the lower shear surface (22) is the inner annular side wall (24) of the lower concave ring groove (21), and when the upper mold (1) and the lower mold (2) are in the mold-clamping state, the upper convex ring block (11) is accommodated in the lower concave ring groove (21), and the surface of the upper convex ring block (11) does not contact the inner wall of the lower concave ring groove (21). Through such a design, the upper mold and the lower mold are not subjected to force, and all forces are applied to the material, thereby avoiding the loss of pressure of the material.

[0008] The preferred technical solution is that the outer periphery of the lower concave ring groove (21) is the lower mold limiting plane (23), the outer periphery of the upper convex ring block (11) is the upper mold limiting plane (13), and the lower mold limiting plane (23) is provided with a vertical limiting anti-collision block (51) that cooperates with the upper mold limiting plane (13); when the upper mold (1) and the lower mold (2) are in the mold-closing state, the vertical limiting anti-collision block (51) does not contact the upper mold limiting plane (13). Through such a design, it is prevented that the upper mold and the lower mold collide when they are molded together, resulting in damage to the mold.

[0009] The preferred technical solution is that the upper convex ring block (11) includes an inner side wall (14), a lower surface (15), and an outer side wall (16) from the inside to the outside; the lower concave ring groove (21) includes an inner groove annular side wall (24), a groove bottom surface (25), and an outer groove annular side wall (26) from the inside to the outside; and a horizontal anti-collision block (52) is provided on the outer groove annular side wall (26) to prevent the outer groove annular side wall (26) from colliding with the outer side wall (16). Through such a design, the upper mold and the lower mold are prevented from directly offsetting and colliding when the mold is empty, the mold is protected, and the service life of the mold is guaranteed.

[0010] The preferred technical solution is that the gap between the inner side wall (14) and the inner annular side wall (24) of the groove, the gap between the lower surface (15) and the bottom surface (25) of the groove, and the gap between the outer side wall (16) and the outer annular side wall (26) of the groove are connected in sequence to form the overflow gap (4). Through such a design, the molding of the vertical shearing semi-overflow molding structure is guaranteed, and the vertical shearing semi-overflow of the material is guaranteed.

[0011] The advantages and beneficial effects of the present invention are as follows: the present invention designs a product structure design that is specifically suitable for the semi-overflow compression molding process. By designing the upper convex ring block to be accommodated in the lower concave ring groove, the surface of the upper convex ring block does not contact the inner wall of the lower concave ring groove, thereby achieving the purpose of applying all forces to the material, so that the mold of the semi-overflow compression molding process has a more reasonable structure, reduces the scrap rate in the product production process, and increases the life of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the vertical shearing type semi-flashing molding structure embodiment 1 of the present invention before mold closing;

[0013] Figure 2 Schematic diagram of the vertical shearing type semi-flashing molding structure embodiment 1 of the present invention when the mold is closed;

[0014] Figure 3 It is a schematic diagram of material a after mold closing is completed in Example 1 of the vertical shearing type semi-flashing molding structure of the present invention;

[0015] Figure 4 It is a schematic diagram of a horizontal shear type semi-flashing molding structure in the prior art;

[0016] Figure 5 It is a schematic diagram of the material after the horizontal shearing semi-flashing molding is completed in the prior art.

[0017] In the figure: 1. upper mold; 11. upper convex ring block; 12. upper shear surface; 13. upper mold limiting plane; 14. inner side wall; 15. lower surface; 16. outer side wall; 2. lower mold; 21. lower concave ring groove; 22. lower shear surface; 23. lower mold limiting plane; 24. inner annular side wall of the groove; 25. groove bottom surface; 26. outer annular side wall of the groove; 3. cavity; 31. upper cavity; 32. lower cavity; 4. overflow gap; 51. vertical limiting anti-collision block; 52. horizontal anti-collision block; a. material. DETAILED DESCRIPTION

[0018] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0019] Example 1

[0020] like Figure 1-3 As shown, the vertical shear type semi-flash molding structure of Example 1 includes an upper mold 1 and a lower mold 2. The cavity 3 formed by the upper mold 1 and the lower mold 2 is arranged in accordance with the shape of the product. The cavity 3 is composed of an upper cavity 31 of the upper mold 1 and a lower cavity 32 of the lower mold 2. The boundary of the upper cavity 31 is provided with a vertical upper shear surface 12, and the boundary of the lower cavity 32 is provided with a vertical lower shear surface 22. The upper shear surface 12 and the lower shear surface 22 are arranged in parallel.

[0021] The outer edge of the upper cavity 31 is provided with an upper convex ring block 11 protruding downward, and the upper shear surface 12 is the inner side wall 14 of the upper convex ring block 11; the outer edge of the lower cavity 32 is provided with a lower concave ring groove 21 recessed downward, and the lower shear surface 22 is the inner annular side wall 24 of the lower concave ring groove 21. When the upper mold 1 and the lower mold 2 are in the clamping state, the upper convex ring block 11 is accommodated in the lower concave ring groove 21, and the surface of the upper convex ring block 11 does not contact the inner wall of the lower concave ring groove 21.

[0022] The outer periphery of the concave ring groove 21 is the lower mold limiting plane 23, and the outer periphery of the upper convex ring block 11 is the upper mold limiting plane 13. The lower mold limiting plane 23 is provided with a vertical limiting anti-collision block 51 that cooperates with the upper mold limiting plane 13; when the upper mold 1 and the lower mold 2 are in the clamping state, the vertical limiting anti-collision block 51 does not contact the upper mold limiting plane 13.

[0023] The upper convex ring block 11 includes an inner wall 14, a lower surface 15, and an outer wall 16 from the inside to the outside; the lower concave ring groove 21 includes an inner annular side wall 24, a groove bottom surface 25 and an outer annular side wall 26 from the inside to the outside; a horizontal anti-collision block 52 is provided on the outer annular side wall 26 to prevent the outer annular side wall 26 from colliding with the outer wall 16.

[0024] The gap between the inner side wall 14 and the inner annular side wall 24 of the groove, the gap between the lower surface 15 and the bottom surface 25 of the groove, and the gap between the outer side wall 16 and the outer annular side wall 26 of the groove are connected in sequence to form an overflow gap 4.

[0025] like Figure 4-5 As shown: the existing mold is designed for horizontal shearing. During the closing process of the upper and lower molds, after the upper mold extrude the material briefly, the upper and lower molds are contact supported or indirectly supported, which reduces the pressure in the cavity. The pressure applied by the hydraulic press is shared by the upper and lower molds, resulting in product pressure loss and insufficient extrusion, resulting in material shortage, poor appearance quality, poor physical properties, and inability to guarantee the molding effect.

[0026] An embodiment of the vertical shearing type semi-overflow molding structure of the present invention is as follows: material a is placed on the lower mold 2, and the hydraulic press drives the upper mold 1 to descend, and the upper convex ring block 11 is cooperated to be accommodated in the lower concave ring groove 21. When the upper mold 1 touches the material a, the hydraulic press continues to apply pressure, and the upper mold 1 extrude the material a; when material a overflows from the cavity 3 into the overflow gap 4, it is judged that the material a is filled in place in the cavity 3, and the hydraulic press stops applying pressure; in the process of the upper mold 1 and the lower mold 2 being closed, a semi-overflow process state is reached, and the pressure released by the hydraulic press all acts on the material a, and there is no situation in which the upper mold 1 and the lower mold 2 touch each other to offset the pressure, thereby avoiding the loss of pressure of the material a, and the material a can completely fill the entire cavity 3, so as to obtain a final product with full material filling, no shortage of material, and less trapped air.

[0027] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A vertical shear type semi-flashing molding structure, characterized in that: It comprises an upper mold (1) and a lower mold (2), wherein a mold cavity (3) formed by the upper mold (1) and the lower mold (2) is arranged in accordance with the shape of the product, and the mold cavity (3) is composed of an upper mold cavity (31) of the upper mold (1) and a lower mold cavity (32) of the lower mold (2); The boundary of the upper cavity (31) is provided with a vertical upper shearing surface (12), and the boundary of the lower cavity (32) is provided with a vertical lower shearing surface (22), and the upper shearing surface (12) and the lower shearing surface (22) are arranged in parallel; The outer edge of the upper cavity (31) is provided with an upper convex ring block (11) protruding downward, and the upper shear surface (12) is the inner side wall (14) of the upper convex ring block (11); the outer edge of the lower cavity (32) is provided with a lower concave ring groove (21) recessed downward, and the lower shear surface (22) is the inner annular side wall (24) of the lower concave ring groove (21); when the upper mold (1) and the lower mold (2) are in a mold-clamping state, the upper convex ring block (11) is accommodated in the lower concave ring groove (21), and the surface of the upper convex ring block (11) does not contact the inner wall of the lower concave ring groove (21); The periphery of the lower concave annular groove (21) is the lower mold limiting plane (23), the periphery of the upper convex annular block (11) is the upper mold limiting plane (13), and a vertical limiting anti-collision block (51) cooperating with the upper mold limiting plane (13) is arranged on the lower mold limiting plane (23); when the upper mold (1) and the lower mold (2) are in a mold-clamping state, the vertical limiting anti-collision block (51) does not contact the upper mold limiting plane (13); The upper convex ring block (11) comprises, from inside to outside, an inner side wall (14), a lower surface (15), and an outer side wall (16); the lower concave ring groove (21) comprises, from inside to outside, an inner groove annular side wall (24), a groove bottom surface (25), and an outer groove annular side wall (26); a horizontal anti-collision block (52) is provided on the outer groove annular side wall (26) to prevent the outer groove annular side wall (26) from colliding with the outer side wall (16); The matching clearance between the inner side wall (14) and the inner annular side wall (24) of the groove, the matching clearance between the lower surface (15) and the bottom surface (25) of the groove, and the matching clearance between the outer side wall (16) and the outer annular side wall (26) of the groove are connected in sequence to form an overflow clearance (4).

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