Die insert structure for improving hardness of shearing edge of hot pressing die

Abstract

The utility model discloses a mould insert structure for improving the hardness of a shearing edge of a hot pressing mould, which comprises an upper mould base and a lower mould base which are used for mould closing and mould splitting through a mould closing device, the upper mould base comprises a top mould base and a bottom mould frame which is detachably fixed below the top mould base, and the bottom mould frame is detachably fixed below the top mould base in a mould closing state. The circumferential outer edge of the top of the lower die base is attached to the circumferential inner wall of the bottom die frame in a sealed mode, the upper die base and the lower die base define a forming cavity, the bottom die frame comprises inserts, and the inserts are sequentially connected end to end and detachably and fixedly connected with the top die base. According to the mold insert structure for improving the hardness of the shearing edge of the hot pressing mold, the multiple inserts are detachably connected to the upper portion of the top mold base, so that the inserts are sequentially connected end to end to form the bottom mold frame, the split type structure of the upper mold base is further refined, the later maintenance cost is reduced, and the maintenance time is shortened.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection mold production technical field especially is related to a mold insert structure that improves hot pressing mould shear edge hardness. BACKGROUND

[0002] SMC mold is a kind of combined mold for compression molding, which can process series of plastic parts of different shapes and sizes, the series of plastic parts are mainly composed of unsaturated polyester resin, low shrinkage additive, filler, glass fiber and various additives, by mixing these raw materials to form sheet material, then through heating and pressing molding, the final SMC parts are obtained, because different shapes and sizes of plastic parts can be processed, it is widely used in the transportation vehicle industry, for manufacturing various automobile parts, such as automobile bumper, vehicle body shell, interior trim parts, etc.

[0003] In production engineering, due to the cooperation of upper and lower molds and the impact of material flow, shear edge will be normally worn, which will cause related quality problems on the product, when repairing the shear edge, the mold needs to be removed, welded and plated again, not only reduces the repair efficiency, affects the daily production, but also may cause mold damage during welding process, and the repair cost is also high, time-consuming and laborious, therefore, the Chinese utility model patents with publication numbers CN206966433U, CN215849877U, CN219445820U, CN210061796U and CN214447758U disclose various molds, which adopt split structure, when part of the structure is damaged, only the damaged part needs to be removed and replaced, so that the mold can be continued to use, reducing the maintenance cost.

[0004] Although the upper mold or lower mold of the above-mentioned mold adopts split structure, the single part is still oversized, which causes the mold to be completely removed and the entire part corresponding to the damaged position to be removed when the mold is worn, so that the mold maintenance cost still has room for further reduction, and the large size split structure increases the maintenance time; moreover, the split structure is usually connected by bolts, after repeated disassembly and installation, the connection precision of the bolts decreases, which causes the size precision of the mold to decrease, affecting the product quality of compression molding.

[0005] Therefore, it is necessary to improve the split mold in the prior art. UTILITY MODEL CONTENTS

[0006] The utility model aims at overcoming the defects in the prior art, providing a mold insert structure for improving the hardness of shear edge of hot pressing mold, which further reduces the maintenance cost, reduces the maintenance time and ensures the assembly precision to improve the product quality.

[0007] In order to realize the above technical effects, the technical scheme of the utility model is: a die insert structure for improving the shearing edge hardness of hot-pressing die, which comprises an upper die seat and a lower die seat which are clamped and unclamped by a clamping device, the upper die seat comprises a top die seat and a bottom die frame which is detachably fixed below the top die seat, the circumferential outer edge of the top of the lower die seat is sealingly attached to the circumferential inner wall of the bottom die frame in the clamped state, and the upper die seat and the lower die seat form a molding cavity, and the bottom die frame comprises:

[0008] The insert blocks are sequentially connected and detachably fixedly connected to the top die seat.

[0009] Preferably, in order to ensure assembly quality, the insert blocks are connected to the top die seat through first bolts, and the insert blocks are inserted and matched with the top die seat.

[0010] Preferably, in order to further reduce replacement cost, positioning holes are arranged on the insert blocks, and positioning columns which are adapted to the positioning holes are arranged on the top die seat.

[0011] Preferably, in order to improve assembly precision and thus improve product quality, at least two positioning holes are arranged on the insert blocks, and the bottom surface of the positioning column is provided with a chamfer.

[0012] Preferably, in order to avoid assembly errors, marks are arranged on the insert blocks to distinguish the insert blocks.

[0013] Preferably, in order to reduce the difference between the insert blocks and increase replaceability, thereby facilitating maintenance and replacement, the insert blocks are symmetrically distributed at the bottom of the top die seat.

[0014] Preferably, in order to further reduce the difference between the insert blocks, the symmetry planes of the insert blocks are two and perpendicular, and the two symmetry planes of the insert blocks are both perpendicular to the parting surface of the lower die seat and the upper die seat.

[0015] Preferably, in order to increase wear resistance and prolong service life, the insert blocks are high-carbon die steel blocks with HRC 55-62.

[0016] Preferably, in order to further reduce maintenance cost, the insert blocks comprise an inner block body and an outer protective plate which is detachably connected to the outer side of the inner block body, and one side of the outer protective plate is attached to the inner block body.

[0017] Preferably, in order to facilitate detachable connection between the inner block body and the outer protective plate, the inner block body is connected to the outer protective plate through second bolts.

[0018] In summary, compared with the prior art, the mold insert structure of this utility model for improving the hardness of the sheared edge of the hot press mold has multiple inserts that are detachably connected to the top mold base, so that the inserts are connected end to end in sequence to form the bottom mold frame. This further refines the split structure of the upper mold base, reduces the later maintenance cost, and reduces maintenance time. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model when the mold is closed;

[0020] Figure 2 This is a schematic diagram of the structure of this utility model during mold separation;

[0021] Figure 3 This is a structural schematic diagram from another perspective during the mold parting of this utility model;

[0022] Figure 4 This is a schematic diagram of the upper mold base of this utility model;

[0023] Figure 5 yes Figure 4 A bottom view;

[0024] Figure 6 This is a partial structural schematic diagram of the upper mold base of this utility model;

[0025] Figure 7 yes Figure 6 Enlarged view of part A;

[0026] Figure 8 This is a schematic diagram of the structure of the insert of this utility model;

[0027] Figure 9 This is a schematic diagram of the structure using the novel insert from another perspective;

[0028] In the diagram: 1. Upper mold base; 2. Lower mold base; 21. Guide post; 3. Top mold base; 31. Positioning post; 4. Bottom mold frame; 5. Insert; 51. Inner block; 511. Positioning hole; 52. Outer protective plate; 53. Second bolt; 6. First bolt; 7. Mark; 8. Guide hole. Detailed Implementation

[0029] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0030] like Figures 1-9As shown, this utility model discloses a mold insert structure for improving the hardness of the sheared edge of a hot press mold, comprising an upper mold base 1 and a lower mold base 2 for mold closing and opening via a mold closing device. The upper mold base 1 includes a top mold base 3 and a bottom mold frame 4 detachably fixed below the top mold base 3. In the closed state, the outer circumferential edge of the top of the lower mold base 2 is sealed and fitted with the inner circumferential wall of the bottom mold frame 4, and the upper mold base 1 and the lower mold base 2 enclose each other to form a molding cavity. The bottom mold frame 4 includes:

[0031] Insert 5, the first and last parts of which are connected in sequence and can be detachably and fixedly connected to the top mold base 3.

[0032] It should be noted that the mold closing device of the ladder frame in this utility model typically includes a fixed frame and a lifting assembly such as a hydraulic cylinder. The lower mold base 2 is fixed to the fixed frame, the cylinder barrel of the hydraulic cylinder is fixedly connected to the fixed frame, and the piston rod is fixedly connected to the top mold base 3 of the upper mold base 1. The hydraulic cylinder drives the upper mold base 1 to move up and down, thereby controlling the relative movement between the upper mold base 1 and the lower mold base 2, so that the upper mold base 1 and the lower mold base 2 close together (e.g., Figure 1 As shown), it is used for compression molding, and can also be used to separate the upper mold base 1 and the lower mold base 2 (as shown). Figure 2 and Figure 3 (As shown), it is convenient to remove the product or place the blank on the lower mold base 2.

[0033] Compared with the prior art, the upper mold base 1 of this utility model is composed of a top mold base 3 and a bottom mold frame 4 that is detachably fixed below the top mold base 3. During mold closing, the shearing force is mainly concentrated on the inner side of the bottom mold frame 4, making the bottom mold frame 4 more prone to deformation and damage than the top mold base 3. In order to reduce the later maintenance cost, the bottom mold frame 4 in this utility model is composed of multiple inserts 5 connected end to end. Thus, when the bottom mold frame 4 is damaged, only the inserts 5 corresponding to the damaged part need to be replaced by disassembling and replacing them, without having to remove the entire bottom mold frame 4. Compared with the prior art, it is more cost-effective. Moreover, the size of the inserts 5 is smaller than that of the bottom mold frame 4, making it easier to maintain, thereby reducing the time spent repairing the inserts 5 and improving maintenance efficiency.

[0034] A further improvement is that the insert 5 is connected to the top mold base 3 by the first bolt 6, and the insert 5 and the top mold base 3 are inserted into each other.

[0035] Specifically, the insert 5 is provided with a positioning hole 511, and the top mold base 3 is provided with a positioning post 31 that matches the positioning hole 511.

[0036] The precise docking of the insert 5 and the top mold base 3 is achieved through the insertion and engagement between the positioning pin 31 and the positioning hole 511, ensuring docking accuracy and avoiding loosening of the connection part caused by long-term disassembly of the insert 5 by the first bolt 6, which would affect the product molding quality during mold compression. Moreover, compared with the positioning hole 511 being set on the top mold base 3, the positioning hole 511 in this utility model is set on the insert 5, which can reduce the weight of the insert 5, reduce the amount of material used in the production of the insert 5, save costs, and thus reduce the cost of later maintenance and replacement of the insert 5.

[0037] A further improvement is that the insert 5 is provided with at least two positioning holes 511, and the bottom surface of the positioning post 31 is provided with a chamfer.

[0038] By setting two positioning holes 511, the docking accuracy between the insert 5 and the top mold base 3 is increased. Moreover, by setting a chamfer on the bottom surface of the positioning post 31, it is convenient to fit the positioning hole 511 onto the positioning post 31. After the positioning post 31 and the top mold base 3 are docked, the first bolt 6 is screwed in to fix the insert 5 onto the top mold base 3.

[0039] A further improvement is that the inserts 5 are symmetrically distributed at the bottom of the top mold base 3; the inserts 5 have two symmetrical planes that are perpendicular to each other, and both symmetrical planes of the inserts 5 are perpendicular to the parting surfaces of the lower mold base 2 and the upper mold base 1.

[0040] In the lower mold base 2, the bottom mold frame 4 is a rectangular frame, and ten inserts 5 are provided, such as... Figure 4 and Figure 5 As shown, four inserts 5 are symmetrically distributed at the four corners of the rectangular frame. Of the remaining six inserts 5, two have the same size and structure and are distributed on the two shorter sides of the rectangular frame, while the remaining four have the same size and structure and are paired up and symmetrically distributed on the two longer sides of the rectangular frame. This structure reduces the differences between the inserts 5, facilitates their interchangeability, reduces the types of equipment used to produce the inserts 5, lowers the production cost of the inserts 5, and consequently reduces the production cost of the mold.

[0041] Guide holes 8 are provided on the inner blocks 51 of the inserts 5 at the four corners, and guide posts 21 extending in the vertical direction are provided at the four corners of the lower mold base 2. The guide posts 21 slide with the guide holes 8 to ensure the docking accuracy between the lower mold base 2 and the upper mold base 1.

[0042] A further improvement is that the insert 5 includes an inner block 51 and an outer protective plate 52 detachably connected to the outside of the inner block 51, with one side of the outer protective plate 52 fitting against the inner block 51; the insert 5 includes an inner block 51 and an outer protective plate 52 detachably connected to the outside of the inner block 51, with one side of the outer protective plate 52 fitting against the inner block 51; the inner block 51 is connected to the outer protective plate 52 by a second bolt 53.

[0043] The outer protective plate 52 can protect the outer side of the inner block 51, so that only the inner surface of the inner block 51 is worn during the compression molding process. When the insert 5 is deformed and damaged, it is not necessary to replace the entire insert 5. Only the inner block 51 needs to be replaced to complete the enclosure replacement, which reduces the later maintenance cost.

[0044] A further improvement is that each inlay 5 is marked with a mark 7 to distinguish it from another inlay 5.

[0045] Specifically, the insert 5 has two markings 7, one of which is located on the side of the outer protective plate 52 facing away from the inner block 51, such as... Figure 7 As shown, another mark 7 is located on the top surface of the inner block 51, that is, the side close to the top mold base 3. By using the two marks 7, the assembly error between the outer protective plate 52 and the inner block 51 can be avoided. Moreover, the installation position of the insert 5 can be determined, so as to avoid the incorrect installation position of the insert 5 on the top mold base 3, thereby achieving the effect of distinguishing each insert 5.

[0046] A further improvement is that insert 5 is a high-carbon mold steel block with a carbon content of HRC55-62.

[0047] Furthermore, both the top mold base 3 and the lower mold base 2 are made of low-carbon mold steel. After heat treatment, the hardness of the steel is between HRC28 and 42. Due to the limitations of CNC machine tool cutters and tips, this material hardness is suitable for large CNC high-speed milling of deep cavities in machine housings. During the molding process, the sheared edges are constantly subjected to high temperature, high pressure, and friction from glass fibers, making them extremely prone to wear after mass production. Only by increasing the hardness of the sheared edges can the rate and extent of wear be reduced.

[0048] Since the insert 5 is an independent structure, it is no longer limited to using the same low-carbon steel as the top mold base 3 and the lower mold base 2. It can use high-carbon mold steel. Through heat treatment, the hardness of the insert 5 can reach HRC55~62. And because it is designed as an independent small insert 5, even if the hardness is increased, there are enough processing methods to complete the processing, such as grinding and wire cutting. Moreover, since the insert 5 is a convex structure, there are no process limitations when using carbide tools. At the same time, due to the different product structures, there will definitely be local areas that are prone to wear. These areas can be maintained and repaired individually by disassembling the insert 5, thereby reducing the cost and time of maintenance and repair of large and small molds, improving replacement efficiency, and saving maintenance time.

[0049] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A mold insert structure for improving the hardness of the sheared edge of a hot press mold, comprising an upper mold base and a lower mold base for mold closing and opening via a mold closing device, wherein the upper mold base includes a top mold base and a bottom mold frame detachably fixed below the top mold base; in the mold-closed state, the outer circumferential edge of the top of the lower mold base is sealed and fitted against the inner circumferential wall of the bottom mold frame, and the upper mold base and the lower mold base enclose a molding cavity, characterized in that... The bottom mold frame includes: The inserts are connected end to end and are detachably and fixedly connected to the top mold base.

2. The mold insert structure for improving the hardness of the sheared edge of a hot pressing mold according to claim 1, characterized in that: The insert is connected to the top mold base by a first bolt, and the insert and the top mold base are interlocked.

3. The mold insert structure for improving the hardness of the sheared edge of a hot pressing mold according to claim 2, characterized in that: The insert is provided with a positioning hole, and the top mold base is provided with a positioning post that matches the positioning hole.

4. The mold insert structure for improving the hardness of the sheared edge of a hot pressing mold according to claim 3, characterized in that: The insert has at least two positioning holes, and the bottom surface of the positioning post has a chamfer.

5. The mold insert structure for improving the hardness of the sheared edge of a hot pressing mold according to claim 1, characterized in that: The inserts are marked to distinguish each insert.

6. The mold insert structure for improving the hardness of the sheared edge of a hot pressing mold according to claim 1, characterized in that: The inserts are symmetrically distributed at the bottom of the top mold base.

7. The mold insert structure for improving the hardness of the sheared edge of a hot pressing mold according to claim 6, characterized in that: The insert has two perpendicular symmetrical planes, and both symmetrical planes are perpendicular to the parting surfaces of the lower mold base and the upper mold base.

8. The mold insert structure for improving the hardness of the sheared edge of a hot pressing mold according to claim 1, characterized in that: The insert is a high-carbon mold steel block with a strength of HRC55-62.

9. The mold insert structure for improving the hardness of the sheared edge of a hot pressing mold according to claim 1, characterized in that: The insert includes an inner block and an outer protective plate detachably connected to the outside of the inner block, with one side of the outer protective plate fitting against the inner block.

10. The mold insert structure for improving the hardness of the sheared edge of a hot pressing mold according to claim 9, characterized in that: The inner block is connected to the outer protective plate by a second bolt.

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