An assist forming assembly and a female die

Abstract

The utility model relates to lithium battery technical field especially, is a kind of auxiliary forming assembly and female die, form in female die for the stretch forming of shell, the via hole is formed in the centre of auxiliary forming assembly, one end of the via hole is access end to access shell, the via hole starts to narrow from the access end, the inner wall section of the part of the via hole close to the access end is formed into pressure-bearing section to bear initial impact force of shell, the pressure-bearing section is made of die steel, the inner wall section of the part of the via hole adjoining the pressure-bearing section is formed into forming section to gradually form subsequent auxiliary shell, the forming section is made of ceramic. The technical problem that the part of female die and shell contact forming in prior art is too fast to be solved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to an auxiliary molding component and a die. Background Technology

[0002] The overall shape of the lithium battery casing is cylindrical, which is formed by stamping with a mold. The casing is placed in a die and stamped by a punch. During the stamping process, the casing is stretched (the cylindrical casing becomes more slender after stretching, with a smaller diameter and a higher height). During the stretching process, the casing will rub against the part in contact with the die multiple times. The mold is mostly made of mold steel, which has general wear resistance, resulting in the area in the die that contacts the casing being formed being worn too quickly. Summary of the Invention

[0003] To address the technical problem of excessive wear and tear in the part of the die that contacts the housing during molding in the prior art, this application proposes an auxiliary molding component and a die, which solves the aforementioned technical problem.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] This utility model provides an auxiliary forming component, formed in a die for stretching and forming a shell. The auxiliary forming component has a through hole in the center, one end of which is an access end for connecting to the shell. The through hole narrows from the access end. The inner wall section of the through hole near the access end is formed as a pressure-bearing section to withstand the initial impact force of the shell. The pressure-bearing section is made of die steel. The inner wall section of the through hole adjacent to the pressure-bearing section is formed as a forming section for the subsequent gradual forming of the shell. The forming section is made of ceramic.

[0006] Furthermore, the auxiliary molding component includes a pressure-bearing body made of mold steel and a wear-resistant body made of ceramic embedded in the pressure-bearing body. The through hole is formed on the pressure-bearing body, and the inner wall section of the through hole near the access end is formed as the pressure-bearing section. An assembly groove is provided at the inner wall of the through hole adjacent to the pressure-bearing section. The embedded section of the wear-resistant body is embedded in the assembly groove and fixedly connected to the pressure-bearing body. The portion of the wear-resistant body protruding outside the assembly groove is formed as the molding section.

[0007] Furthermore, the front section of the assembly groove near the groove opening is a tapering section that is wider on the outside and narrower on the inside, and the rear section of the assembly groove away from the groove opening is a limiting section that expands outward again at the narrowest point of the tapering section. The embedded section of the wear-resistant body is adapted to the shape of the assembly groove.

[0008] Furthermore, the wear-resistant body is inserted into the assembly groove from the cross-section of the pressure-bearing body, and then the cross-sections of the pressure-bearing body are spliced ​​together and connected.

[0009] Furthermore, the auxiliary molding component includes a pressure-bearing body made of mold steel to form the pressure-bearing section, and a wear-resistant body made of ceramic is welded to a corresponding position of the pressure-bearing body to form the molding section.

[0010] Furthermore, the wear-resistant body is welded to the pressure-bearing body by active metal brazing.

[0011] Furthermore, the pressure-bearing section is provided with a plurality of micro-holes, all of which are distributed in a ring shape on the surface of the pressure-bearing section.

[0012] The present invention also provides a die cavity in which the above-mentioned auxiliary forming component is detachably assembled, and the auxiliary forming component is configured as a ring structure.

[0013] Furthermore, the die includes a base that is connected to the auxiliary molding component. The inner ring of the base is raised upward to form a guide positioning post. Correspondingly, the bottom of the auxiliary molding component extends downward to form a guide positioning section that can be sleeved and fitted onto the guide positioning post. At the same time, the die also includes a limiting cover. The limiting cover includes a sleeve that is sleeved and attached to the outer wall surface of the auxiliary molding component and a cover that is pressed against the top surface of the auxiliary molding component. The bottom end of the sleeve is engaged with the outer ring of the base and detachably connected to the base.

[0014] Furthermore, the limiting cover is screwed to the base, and the screwed bolt passes through the outer ring of the base and is inserted into the wall thickness of the sleeve of the limiting cover.

[0015] Based on the above technical solution, the technical effects that this utility model can achieve are as follows:

[0016] The auxiliary forming component of this utility model has a central through hole for receiving the shell. The part of the through hole that contacts the shell is divided into a pressure-bearing section and a forming section. The pressure-bearing section is made of mold steel and has a certain toughness to receive the initial impact force of the shell. The forming section is made of ceramic. Ceramic has high hardness and a smooth surface, resulting in low frictional resistance when in contact with the shell. It is more wear-resistant than mold steel. In particular, ceramic is inherently less prone to cold welding with metal materials (such as steel and aluminum), which is a huge advantage. It can avoid the formation of weld beads when using steel molds (such as mold steel or tungsten steel) and metal falling off the shell, thus avoiding the weld beads scratching the shell surface. Compared with a mold made of mold steel alone, the forming section made of ceramic in the auxiliary forming component of this utility model is more wear-resistant. Compared with a mold made of ceramic alone, the pressure-bearing section made of mold steel also has a certain toughness to resist impact, overcoming the problem of easy breakage of single ceramic materials under stress. Thus, it solves the technical problem of excessive wear of the forming part of the mold in contact with the shell in the prior art.

[0017] The auxiliary molding component of this invention has multiple micro-holes on the pressure-bearing section, all of which are arranged in a ring on the surface of the pressure-bearing section. These micro-holes can collect metal impurities, such as nickel or aluminum powder, falling from the shell, preventing them from protruding from the surface of the pressure-bearing section and damaging the outer surface of the shell. Oil can also be pre-filled into the micro-holes to slow down the carbonization of the mold steel. Simultaneously, in conjunction with an external oil spraying device, the pressure-bearing section can be periodically flushed, reducing the accumulation of foreign matter and preventing tensile defects in the shell.

[0018] The present invention has an auxiliary molding component detachably assembled inside the die. The auxiliary molding component is designed as a replaceable part. Compared with an integrally molded die, it is not necessary to move the large and heavy die as a whole. Only the auxiliary molding component needs to be replaced, which is more time-saving, labor-saving and economical. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the pressure-bearing section of the auxiliary molding component of the shell in this utility model;

[0020] Figure 2 This is a schematic diagram of the molding section of the auxiliary molding component of the shell in this utility model;

[0021] Figure 3 This is a cross-sectional exploded view of the auxiliary molding component of this utility model;

[0022] Figure 4 This is a schematic diagram of the micro-holes on the pressure-bearing section of the auxiliary molding component of this utility model;

[0023] Figure 5 This is a schematic diagram of the concave mold of this utility model.

[0024] Wherein: a-shell; 1-pressure-bearing body, 11-through hole, 12-pressure-bearing section, 121-micro hole, 13-assembly groove, 131-tightening section, 132-limiting section, 14-guide and positioning section; 2-wear-resistant body, 21-forming section, 22-embedding section; 3-base, 31-guide and positioning post; 4-limiting cover, 41-sleeve body, 42-cover body. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0026] like Figure 1-4 As shown, this utility model provides an auxiliary forming component, which is formed in a die for stretching and forming a shell a. A through hole 11 is formed in the center of the auxiliary forming component. One end of the through hole 11 is an access end for connecting to the shell a. The through hole 11 narrows from the access end. The inner wall section of the through hole 11 near the access end is formed as a pressure-bearing section 12 to withstand the initial impact force of the shell a. The pressure-bearing section 12 is made of die steel. The inner wall section of the through hole 11 adjacent to the pressure-bearing section 12 is formed as a forming section 21 for the subsequent gradual forming of the shell a. The forming section 21 is made of ceramic.

[0027] In a specific embodiment of this utility model, the auxiliary molding component includes a pressure-bearing body 1 made of mold steel and a wear-resistant body 2 made of ceramic embedded in the pressure-bearing body 1. A through hole 11 is formed on the pressure-bearing body 1. The inner wall section of the through hole 11 near the access end is formed as a pressure-bearing section 12. An assembly groove 13 is provided on the inner wall of the through hole 11 adjacent to the pressure-bearing section 12. The embedded section 22 of the wear-resistant body 2 is embedded in the assembly groove 13 and fixedly connected to the pressure-bearing body 1. The part of the wear-resistant body 2 protruding outside the assembly groove 13 is formed as a molding section 21.

[0028] Specifically, the front section of the assembly groove 13 near the groove opening is a tightening section 131 that is wider on the outside and narrower on the inside, and the rear section of the assembly groove 13 away from the groove opening is a limiting section 132 that expands outward again at the narrowest point of the tightening section 131. The embedded section 22 of the wear-resistant body 2 is adapted to the shape of the assembly groove 13.

[0029] Specifically, the wear-resistant body 2 is inserted into the assembly groove 13 from the cross section of the pressure-bearing body 1, and then the cross sections of the pressure-bearing body 1 are spliced ​​together.

[0030] Optionally, the auxiliary molding component includes a pressure-bearing body 1 made of mold steel to form a pressure-bearing section 12, and a wear-resistant body 2 made of ceramic is welded to a corresponding position of the pressure-bearing body 1 to form a molding section 21.

[0031] Specifically, the wear-resistant body 2 is welded to the pressure-bearing body 1 by active metal brazing, which is a standard method for welding ceramics (such as alumina, silicon nitride, and cubic boron nitride) to steel or cemented carbide tool holders.

[0032] In a preferred embodiment of this invention, the pressure-bearing section 12 is provided with a plurality of micro-holes 121, all of which are arranged in a ring on the surface of the pressure-bearing section 12. The micro-holes 121 can accommodate impurities, such as nickel powder and aluminum powder, falling from the shell a, preventing impurities from protruding from the surface of the pressure-bearing section 12 and damaging the outer surface of the shell a. Oil can also be pre-filled into the micro-holes 121 to slow down the carbonization of the mold steel. At the same time, in conjunction with an external oil spraying device, the pressure-bearing section 12 can be periodically flushed to reduce the accumulation of foreign matter and avoid tensile defects in the shell a.

[0033] like Figure 5 As shown, the present invention also provides a die cavity in which the above-mentioned auxiliary molding component is detachably assembled. The auxiliary molding component is configured as a ring structure for easy assembly.

[0034] In a specific embodiment of this utility model, the die includes a base 3 that is connected to an auxiliary molding component. The inner ring of the base 3 is raised upward to form a guide positioning post 31. Correspondingly, the bottom of the auxiliary molding component extends downward to form a guide positioning section 14 that can be sleeved and fitted on the guide positioning post 31. The guide positioning section 14 is formed on the pressure-bearing body 1. At the same time, the die also includes a limiting cover 4. The limiting cover 4 includes a sleeve 41 that is sleeved and attached to the outer wall of the auxiliary molding component and a cover 42 that is pressed onto the top surface of the auxiliary molding component. The bottom end of the sleeve 41 is lifted and attached to the outer ring of the base 3 and detachably connected to the base 3.

[0035] Specifically, the limiting cover 4 is screwed to the base 3, and the screwing bolt passes through the outer ring of the base 3 and is inserted into the wall thickness of the sleeve 41 of the limiting cover 4.

[0036] It should be understood that the specific embodiments described above are only for explaining the present invention and are not intended to limit the present invention. Obvious variations or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

1. An auxiliary molding component, characterized in that, A through hole (11) is formed in the die for stretching and forming of the housing (a). The auxiliary forming component has a through hole (11) in the center. One end of the through hole (11) is an access end for accessing the housing (a). The through hole (11) narrows from the access end. The inner wall section of the through hole (11) near the access end is formed as a pressure-bearing section (12) to withstand the initial impact force of the housing (a). The pressure-bearing section (12) is made of die steel. The inner wall section of the through hole (11) adjacent to the pressure-bearing section (12) is formed as a forming section (21) for the subsequent gradual forming of the auxiliary housing (a). The forming section (21) is made of ceramic.

2. The auxiliary molding component according to claim 1, characterized in that, The auxiliary molding component includes a pressure-bearing body (1) made of mold steel and a wear-resistant body (2) made of ceramic embedded in the pressure-bearing body (1). A through hole (11) is formed on the pressure-bearing body (1). The inner wall section of the through hole (11) near the access end is formed as the pressure-bearing section (12). An assembly groove (13) is provided at the inner wall of the through hole (11) adjacent to the pressure-bearing section (12). The embedded section (22) of the wear-resistant body (2) is embedded in the assembly groove (13) and fixedly connected to the pressure-bearing body (1). The part of the wear-resistant body (2) protruding outside the assembly groove (13) is formed as the molding section (21).

3. The auxiliary molding component according to claim 2, characterized in that, The assembly groove (13) has a front section (131) that is wider on the outside and narrower on the inside near the opening. The rear section of the assembly groove (13) away from the opening is a limiting section (132) that expands outward again at the narrowest point of the tightening section (131). The embedded section (22) of the wear-resistant body (2) is adapted to the shape of the assembly groove (13).

4. The auxiliary molding component according to claim 3, characterized in that, The wear-resistant body (2) is inserted into the assembly groove (13) from the cross-section of the pressure-bearing body (1), and then the cross-sections of the pressure-bearing body (1) are spliced ​​together and connected.

5. The auxiliary molding component according to claim 1, characterized in that, The auxiliary molding assembly includes a pressure-bearing body (1) made of mold steel to form the pressure-bearing section (12), and a wear-resistant body (2) made of ceramic is welded to the corresponding position of the pressure-bearing body (1) to form the molding section (21).

6. The auxiliary molding component according to claim 5, characterized in that, The wear-resistant body (2) is welded to the pressure-bearing body (1) by active metal brazing.

7. The auxiliary molding component according to claim 6, characterized in that, The pressure-bearing section (12) is provided with a plurality of micro-holes (121), and all the micro-holes (121) are distributed in a ring on the surface of the pressure-bearing section (12).

8. A die, characterized in that, The cavity is detachably fitted with an auxiliary molding component as described in any one of claims 1-7, the auxiliary molding component being configured as a ring structure.

9. The die according to claim 8, characterized in that, The die includes a base (3) that is connected to the auxiliary molding component. The inner ring of the base (3) is raised upward to form a guide positioning post (31). Correspondingly, the bottom of the auxiliary molding component extends downward to form a guide positioning section (14) that can be sleeved and fitted on the guide positioning post (31). At the same time, the die also includes a limiting cover (4). The limiting cover (4) includes a sleeve (41) that is sleeved and attached to the outer wall surface of the auxiliary molding component and a cover (42) that is pressed against the top surface of the auxiliary molding component. The bottom end of the sleeve (41) is lifted and attached to the outer ring of the base (3) and detachably connected to the base (3).

10. The die according to claim 9, characterized in that, The limiting cover (4) is screwed to the base (3), and the screwed bolt passes through the outer ring of the base (3) and is inserted into the wall thickness of the sleeve (41) of the limiting cover (4).

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