Lining core cold heading forming die set

Abstract

The utility model discloses a lining core cold heading forming die set which comprises a first cold heading die, a second cold heading die, a third cold heading die, a fourth cold heading die, a fifth cold heading die and a sixth cold heading die. The first cold-heading die is used for forming a first cold-heading part from the blank, a first cold-heading hole is formed in the upper end of the first cold-heading part, and a first cold-heading rod is formed at the lower end of the first cold-heading part; the second cold heading die is used for forming a second cold heading hole from the first cold heading hole and forming a second cold heading rod from the first cold heading rod; the third cold heading die is used for forming a third cold heading hole from the second cold heading hole and forming a third cold heading rod from the second cold heading rod; the fourth cold heading die is used for forming a fourth cold heading hole from the third cold heading hole and forming a fourth cold heading rod from the third cold heading rod; the fifth cold heading die is used for forming a fifth cold heading hole from the fourth cold heading hole and forming a fifth cold heading rod from the fourth cold heading rod; and the sixth cold heading die is used for forming the fifth cold heading hole in a penetrating mode, and finally the finished lining core is formed. The casting is simple in shape and easy to operate.

Description

Technical Field

[0001] This utility model belongs to the field of cold heading molds with linings, and specifically relates to a cold heading mold assembly with linings. Background Technology

[0002] Cold heading die sets are key tools used in the cold heading process of metal parts. Cold heading refers to a processing method in which metal material is forced through a die under high pressure without heating to form the desired shape and size.

[0003] Currently, most casting methods for core liners employ heat treatment casting processes. However, heat treatment processes require energy to heat or cool during preparation. Furthermore, during the casting process, the vertical walls or ribs of the casting need to have appropriate draft angles to facilitate the removal of the mold and core. If the draft angle is not appropriate, it may lead to difficulties in demolding or damage to the casting.

[0004] Therefore, the above situation urgently needs to be addressed. Utility Model Content

[0005] Purpose of the utility model: In order to overcome the above shortcomings, the purpose of this utility model is to provide a core-lined cold heading forming mold assembly that can accurately control the deformation amount at each stage to ensure the quality of the parts, and the shape of the casting is as simple as possible and easy to operate.

[0006] Technical solution: A cold heading forming die set for a core liner, the die set comprising a first cold heading die, a second cold heading die, a third cold heading die, a fourth cold heading die, a fifth cold heading die, and a sixth cold heading die;

[0007] The first cold heading die is used to form a first cold heading part from a blank, with a first cold heading surface formed at the upper end and a first cold heading rod formed at the lower end. The second cold heading die is used to form a second cold heading part from the first cold heading part, with the first cold heading surface forming a second cold heading surface and the first cold heading rod forming a second cold heading rod. The third cold heading die is used to form a third cold heading part from the second cold heading part, with the second cold heading surface forming a third cold heading surface and the second cold heading rod forming a third cold heading rod. The rod is used to form the third cold heading rod; the fourth cold heading die is used to form the third cold heading part into the fourth cold heading part, the third cold heading surface into the fourth cold heading surface, and the third cold heading rod into the fourth cold heading rod; the fifth cold heading die is used to form the fourth cold heading part into the fifth cold heading part, the fourth cold heading surface into the fifth cold heading surface, and the fourth cold heading rod into the fifth cold heading rod; the sixth cold heading die is used to penetrate and form the fifth cold heading surface, ultimately forming the finished core liner.

[0008] This application employs six sets of molds and a multi-step cold heading process, enabling precise control of material flow and deformation. The mold set allows for more refined control of the deformation amount of the liner core each time, gradually forming a single piece, thereby effectively avoiding the occurrence of cracks or fractures.

[0009] Furthermore, the first cold heading die includes a first cold heading upper die and a first cold heading lower die; the first cold heading upper die includes a first cold heading upper die shell, a first upper ejector rod is provided inside the first cold heading upper die shell, the head end face of the first upper ejector rod corresponds to the shape of the first cold heading surface, and the first cold heading surface is formed into an inverted triangle shape at the stamping center position;

[0010] The first cold heading die includes a first cold heading die shell, a first lower die core is provided at the upper end of the first cold heading die shell, a first lower die cavity is provided in the first lower die core, and the first cold heading part is provided in the first lower die cavity; a first lower pad is provided at the lower end of the first cold heading die shell; the first cold heading die shell also includes a first lower push rod, the first lower push rod passes through the first lower pad and extends into the first lower die cavity; the head of the first cold heading lower push rod pushes against the tail of the first cold heading rod.

[0011] This application uses a first cold heading die to cold heading the blank into a first cold heading part, and sets a first lower ejector pin to push the first cold heading part into a second cold heading die.

[0012] Furthermore, the second cold heading die includes a second upper cold heading die and a second lower cold heading die; the second upper cold heading die includes a second upper cold heading mold shell, a second upper ejector rod is provided inside the second upper cold heading mold shell, the second upper ejector rod presses against the first cold heading surface to form a second cold heading surface; a second upper mold core is provided inside the second upper mold shell, a second upper mold cavity is provided inside the second upper mold core, and the upper end portion of the second cold heading part is placed in the second upper mold cavity;

[0013] The second cold heading die includes a second cold heading die shell, a second lower die core is provided at the upper end of the second cold heading die shell, and the second lower die core is arranged vertically opposite to the second upper die core; the second lower die core is provided with a second lower die cavity, and the second cold heading part is disposed in the second lower die cavity; a second lower pad is provided at the lower end of the second cold heading die shell; the second cold heading die shell also includes a second lower push rod, which passes through the second lower pad and extends into the second lower die cavity.

[0014] This application uses a second cold heading die to cold heading the first cold heading part into a second cold heading part, and sets a second lower ejector pin to push the second cold heading part into a third cold heading die.

[0015] Furthermore, the third cold heading die includes a third cold heading upper die and a third cold heading lower die; the third cold heading upper die includes a third cold heading upper die shell, and a third upper push rod is provided inside the third cold heading upper die shell, and the third upper push rod presses against the second cold heading surface to form the third cold heading surface;

[0016] The third cold heading die includes a third cold heading die shell, a third lower die core is provided at the upper end of the third cold heading die shell, a third lower die cavity is provided in the third lower die core, and the third cold heading part is provided in the third lower die cavity; a third lower pad is provided at the lower end of the third cold heading die shell; the third cold heading die shell also includes a third lower ejector rod, the third lower ejector rod passes through the third lower pad and extends into the third lower die cavity; the head of the third cold heading ejector rod punches the tail of the third cold heading rod.

[0017] This application uses a third cold heading die to cold heading the second cold heading part into a third cold heading part, and sets a third lower ejector pin to push the third cold heading part into a fourth cold heading die.

[0018] Furthermore, the fourth cold heading mold includes a fourth cold heading upper mold and a fourth cold heading lower mold; the fourth cold heading upper mold includes a fourth cold heading upper mold shell, and a fourth upper push rod is provided inside the fourth cold heading upper mold shell, and the fourth upper push rod presses against the third cold heading surface to form the fourth cold heading surface;

[0019] The fourth cold heading die includes a fourth cold heading die shell, a fourth lower die core is provided at the upper end of the fourth cold heading die shell, a fourth lower die cavity is provided in the fourth lower die core, and the fourth cold heading part is provided in the fourth lower die cavity; a fourth lower pad is provided at the lower end of the fourth cold heading die shell; the fourth cold heading die shell also includes a fourth lower ejector rod, the fourth lower ejector rod passes through the fourth lower pad and extends into the fourth lower die cavity; the head of the fourth cold heading ejector rod punches the tail of the fourth cold heading rod.

[0020] This application uses a fourth cold heading die to cold heading the third cold heading part into a fourth cold heading part, and sets a fourth lower ejector pin to push the fourth cold heading part into the fifth cold heading die.

[0021] Furthermore, the fifth cold heading die includes a fifth upper cold heading die and a fifth lower cold heading die; the fifth upper cold heading die includes a fifth upper cold heading mold shell, a fifth upper ejector rod is provided inside the fifth upper cold heading mold shell, the fifth upper ejector rod presses against the fourth cold heading surface to form the fifth cold heading surface; a fifth upper mold core is provided inside the fifth upper cold heading mold shell, a fifth upper mold cavity is provided inside the fifth upper mold core, and the upper part of the fifth cold heading part is placed in the fifth upper mold cavity;

[0022] The fifth cold heading die includes a fifth cold heading die shell, a fifth lower die core is provided at the upper end of the fifth cold heading die shell, a fifth lower die cavity is provided in the fifth lower die core, and the fifth cold heading part is provided in the fifth lower die cavity; a fifth lower pad is provided at the lower end of the fifth cold heading die shell; the fifth cold heading die shell also includes a fifth lower ejector rod, the fifth lower ejector rod passes through the fifth lower pad and extends into the fifth lower die cavity; the head of the fifth cold heading ejector rod punches the tail of the fifth cold heading rod.

[0023] This application uses a fifth cold heading die to cold heading the fourth cold heading part into a fifth cold heading part, and sets a fifth lower ejector pin to push the fifth cold heading part into a sixth cold heading die.

[0024] Furthermore, the sixth cold heading mold includes a sixth cold heading upper mold and a sixth cold heading lower mold; the sixth cold heading upper mold includes a sixth cold heading upper mold shell, and a sixth upper ejector rod is provided inside the sixth cold heading upper mold shell, and the sixth upper ejector rod presses against the fifth cold heading surface to form the finished product liner;

[0025] The sixth cold heading die includes a sixth cold heading die shell, a sixth lower die core is provided at the upper end of the sixth cold heading die shell, a sixth lower die cavity is provided in the sixth lower die core, and the finished product liner is provided in the sixth lower die cavity; a sixth lower pad is provided at the lower end of the sixth cold heading die shell; the sixth cold heading die shell also includes a sixth lower ejector rod, the sixth lower ejector rod passes through the sixth lower pad and extends into the sixth lower die cavity; the head of the sixth cold heading ejector rod pushes against the tail of the finished product liner.

[0026] This application uses a sixth cold heading die to cold heading the fifth cold heading part into a finished liner core, and sets a sixth lower ejector pin to push the finished liner core out of the material.

[0027] Furthermore, the sixth cold heading die has a scrap surface, which is connected to the sixth lower die cavity.

[0028] This application provides a scrap surface inside the sixth cold heading die, so that the scrap generated during the ejection process of the fifth cold heading part can be discharged from the scrap surface.

[0029] As can be seen from the above technical solution, this utility model has the following beneficial effects:

[0030] 1. This application employs six sets of molds and a multi-step cold heading process, enabling precise control of material flow and deformation. The mold set allows for more refined control of the deformation amount of the liner core each time, gradually forming a single piece, thereby effectively avoiding the occurrence of cracks or fractures.

[0031] 2. The six sets of molds set in this application have a simple structure, which can not only reduce production costs, but also improve production efficiency, reduce the failure rate caused by complex mechanisms, and enable the molds to quickly and flexibly replace cold-forged parts for multi-batch production. Attached Figure Description

[0032] Figure 1 A schematic diagram of a mold structure for a cold heading forming die assembly with a core liner;

[0033] Figure 2 A schematic diagram of the process structure of a cold heading die assembly for a core liner;

[0034] Figure 3A schematic cross-sectional view of the first cold heading die in a cold heading die assembly with a core liner;

[0035] Figure 4 This is a schematic cross-sectional view of the second cold heading die in a cold heading die assembly with a core liner.

[0036] Figure 5 This is a schematic cross-sectional view of the third cold heading die in a cold heading die assembly with a core liner.

[0037] Figure 6 This is a schematic cross-sectional view of the fourth cold heading die in a core-lined cold heading forming die set;

[0038] Figure 7 This is a schematic cross-sectional view of the fifth cold heading die in a cold heading die assembly with a core liner.

[0039] Figure 8 This is a schematic cross-sectional view of the sixth cold heading die in a cold heading die assembly with a core liner.

[0040] Explanation of reference numerals in the attached drawings: 1-First cold heading die; 2-Second cold heading die; 3-Third cold heading die; 4-Fourth cold heading die; 5-Fifth cold heading die; 6-Sixth cold heading die;

[0041] 100 - Raw material; 101 - First cold-headed part; 1011 - First cold-headed surface; 1012 - First cold-heading rod; 201 - Second cold-headed part; 2011 - Second cold-headed surface; 2012 - Second cold-heading rod; 301 - Third cold-headed part; 3011 - Third cold-headed surface; 3012 - Third cold-heading rod; 401 - Fourth cold-headed part; 4011 - Fourth cold-headed surface; 4012 - Fourth cold-heading rod; 501 - Fifth cold-headed part; 5011 - Fifth cold-headed surface; 5012 - Fifth cold-heading rod; 601 - Finished core liner;

[0042] 102-First cold heading upper die shell; 1021-First upper ejector pin; 103-First cold heading lower die shell; 1031-First lower ejector pin; 1032-First lower die core; 1033-First lower pad block;

[0043] 202-Second cold heading upper mold shell; 2021-Second upper ejector pin; 2022-Second upper mold core; 203-Second cold heading lower mold shell; 2031-Second lower ejector pin; 2032-Second lower mold core; 2033-Second lower pad block;

[0044] 302-Third cold heading upper mold shell; 3021-Third upper ejector pin; 303-Third cold heading lower mold shell; 3031-Third lower ejector pin; 3032-Third lower mold core; 3033-Third lower pad block;

[0045] 402-Fourth cold heading upper mold shell; 4021-Fourth upper ejector pin; 403-Fourth cold heading lower mold shell; 4031-Fourth lower ejector pin; 4032-Fourth lower mold core; 4033-Fourth lower pad block;

[0046] 502-Fifth cold heading upper die shell; 5021-Fifth upper ejector pin; 5022-Fifth upper die core; 503-Fifth cold heading lower die shell; 5031-Fifth lower ejector pin; 5032-Fifth lower die core; 5033-Fifth lower pad block;

[0047] 602-Sixth cold heading upper mold shell; 6021-Sixth upper ejector pin; 603-Sixth cold heading lower mold shell; 6031-Sixth lower ejector pin; 6032-Sixth lower mold core; 6033-Sixth lower pad block; 604-Scrap surface. Detailed Implementation

[0048] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0049] Example 1

[0050] This embodiment describes a cold heading die assembly for a core liner. Please refer to [reference needed]. Figure 1 As shown, Figure 1 This is a schematic diagram of a cold heading die set for a core liner, including a first cold heading die 1, a second cold heading die 2, a third cold heading die 3, a fourth cold heading die 4, a fifth cold heading die 5, and a sixth cold heading die 6. The core liner is processed using a distributed cold heading forming process with six sets of dies. Please refer to this diagram. Figure 2 As shown, Figure 2 This is a schematic diagram of the process structure of a cold heading die assembly for a core liner, including a blank 100, a first cold heading part 101, a second cold heading part 201, a third cold heading part 301, a fourth cold heading part 401, a fifth cold heading part 501, and a sixth cold heading part 601;

[0051] The first cold heading die 1 is used to form a first cold heading part 101 from a blank 100. A first cold heading surface 1011 is formed at the upper end of the first cold heading part 101, and a first cold heading rod 1012 is formed at the lower end. The second cold heading die 2 is used to form a second cold heading part 201 from the first cold heading part 101, forming a second cold heading surface 2011 from the first cold heading surface 1011, and forming a second cold heading rod 2012 from the first cold heading rod 1012. The third cold heading die 3 is used to form a third cold heading part 301 from the second cold heading part 201, forming a third cold heading surface 3011 from the second cold heading surface 2011, and forming a second cold heading rod 2012 from the second cold heading surface 2012. 12. A third cold heading rod 3012 is formed; the fourth cold heading mold 4 is used to form the third cold heading part 301 into the fourth cold heading part 401, the third cold heading surface 3011 into the fourth cold heading surface 4011, and the third cold heading rod 3012 into the fourth cold heading rod 4012; the fifth cold heading mold 5 is used to form the fourth cold heading part 401 into the fifth cold heading part 501, the fourth cold heading surface 4011 into the fifth cold heading surface 5011, and the fourth cold heading rod 4012 into the fifth cold heading rod 5012; the sixth cold heading mold 6 is used to penetrate and form the fifth cold heading surface 5011, finally forming the finished core 601.

[0052] Please refer to Figure 3 As shown, Figure 3 This is a cross-sectional schematic diagram of the first cold heading die of a core-forming cold heading die assembly; the first cold heading die 1 includes a first cold heading upper die and a first cold heading lower die; the first cold heading upper die includes a first cold heading upper mold shell 102, a first upper ejector rod 1021 is provided inside the first cold heading upper mold shell 102, the head end face of the first upper ejector rod 1021 corresponds to the shape of the first cold heading surface 1011, and the first cold heading surface 1011 is formed into an inverted triangle shape at the stamping center position;

[0053] The first cold heading die includes a first cold heading die shell 103, a first lower die core 1032 is provided at the upper end of the first cold heading die shell 103, a first lower die cavity is provided in the first lower die core 1032, and the first cold heading part 101 is provided in the first lower die cavity; a first lower pad block 1033 is provided at the lower end of the first cold heading die shell 103; the first cold heading die shell 103 also includes a first lower push rod 1031, the first lower push rod 1031 passes through the first lower pad block 1033 and extends into the first lower die cavity; the head of the first cold heading lower push rod punches the tail of the first cold heading rod 1012.

[0054] Please refer to Figure 4 As shown, Figure 4This is a cross-sectional schematic diagram of the second cold heading mold of a core-forming cold heading mold assembly; the second cold heading mold 2 includes a second upper cold heading mold and a second lower cold heading mold; the second upper cold heading mold includes a second upper cold heading mold shell 202, a second upper ejector rod 2021 is provided inside the second upper cold heading mold shell 202, the second upper ejector rod 2021 presses against the first cold heading surface 1011 to form the second cold heading surface 2011; a second upper mold core 2022 is provided inside the second upper mold shell 202, the second upper mold core 2022 is provided with a second upper mold cavity, and the upper part of the second cold heading part 201 is placed in the second upper mold cavity;

[0055] The second cold heading die includes a second cold heading die shell 203, a second lower die core 2032 is provided at the upper end of the second cold heading die shell 203, and the second lower die core 2032 is arranged vertically opposite to the second upper die core 2022; a second lower die cavity is provided in the second lower die core 2032, and the second cold heading part 201 is disposed in the second lower die cavity; a second lower pad block 2033 is provided at the lower end of the second cold heading die shell 203; the second cold heading die shell 203 also includes a second lower push rod 2031, which passes through the second lower pad block 2033 and extends into the second lower die cavity.

[0056] Please refer to Figure 5 As shown, Figure 5 This is a schematic cross-sectional view of the third cold heading die in a core-lined cold heading forming die assembly; the third cold heading die 3 includes a third cold heading upper die and a third cold heading lower die; the third cold heading upper die includes a third cold heading upper mold shell 302, and a third upper push rod 3021 is provided inside the third cold heading upper mold shell 302, the third upper push rod 3021 presses against the second cold heading surface 2011 to form the third cold heading surface 3011;

[0057] The third cold heading die includes a third cold heading die shell 303, a third lower die core 3032 is provided at the upper end of the third cold heading die shell 303, a third lower die cavity is provided in the third lower die core 3032, and the third cold heading part 301 is provided in the third lower die cavity; a third lower pad block 3033 is provided at the lower end of the third cold heading die shell 303; the third cold heading die shell 303 also includes a third lower push rod 3031, the third lower push rod 3031 passes through the third lower pad block 3033 and extends into the third lower die cavity; the head of the third cold heading push rod punches the tail of the third cold heading rod 3012.

[0058] Please refer to Figure 6 As shown, Figure 6This is a cross-sectional schematic diagram of the fourth cold heading die in a core-lined cold heading forming die set; the fourth cold heading die 4 includes a fourth cold heading upper die and a fourth cold heading lower die; the fourth cold heading upper die includes a fourth cold heading upper mold shell 402, and a fourth upper push rod 4021 is provided inside the fourth cold heading upper mold shell 402, and the fourth upper push rod 4021 presses against the third cold heading surface 3011 to form the fourth cold heading surface 4011;

[0059] The fourth cold heading die includes a fourth cold heading die shell 403, a fourth lower die core 4032 is provided at the upper end of the fourth cold heading die shell 403, a fourth lower die cavity is provided in the fourth lower die core 4032, and the fourth cold heading part 401 is provided in the fourth lower die cavity; a fourth lower pad 4033 is provided at the lower end of the fourth cold heading die shell 403; the fourth cold heading die shell 403 also includes a fourth lower push rod 4031, the fourth lower push rod 4031 passes through the fourth lower pad 4033 and extends into the fourth lower die cavity; the head of the fourth cold heading push rod punches the tail of the fourth cold heading rod 4012.

[0060] Please refer to Figure 7 As shown, Figure 7 This is a cross-sectional schematic diagram of the fifth cold heading die in a core-forming cold heading die assembly. The fifth cold heading die 5 includes a fifth upper cold heading die and a fifth lower cold heading die. The fifth upper cold heading die includes a fifth upper cold heading mold shell 502, and a fifth upper ejector rod 5021 is provided inside the fifth upper cold heading mold shell 502. The fifth upper ejector rod 5021 presses against the fourth cold heading surface 4011 to form the fifth cold heading surface 5011. A fifth upper mold core 5022 is provided inside the fifth upper cold heading mold shell 502, and a fifth upper mold cavity is provided inside the fifth upper mold core 5022. The upper part of the fifth cold heading part 501 is placed in the fifth upper mold cavity.

[0061] The fifth cold heading die includes a fifth cold heading die shell 503, a fifth lower die core 5032 is provided at the upper end of the fifth cold heading die shell 503, a fifth lower die cavity is provided in the fifth lower die core 5032, and the fifth cold heading part 501 is provided in the fifth lower die cavity; a fifth lower pad block 5033 is provided at the lower end of the fifth cold heading die shell 503; the fifth cold heading die shell 503 also includes a fifth lower push rod 5031, the fifth lower push rod 5031 passes through the fifth lower pad block 5033 and extends into the fifth lower die cavity; the head of the fifth cold heading push rod punches the tail of the fifth cold heading rod 5012.

[0062] Please refer to Figure 8 As shown, Figure 8This is a cross-sectional schematic diagram of the sixth cold heading mold in a cold heading forming mold assembly for a core liner; the sixth cold heading mold 6 includes a sixth upper cold heading mold and a sixth lower cold heading mold; the sixth upper cold heading mold includes a sixth upper cold heading mold shell 602, and a sixth upper push rod 6021 is provided inside the sixth upper cold heading mold shell 602, and the sixth upper push rod 6021 presses against the fifth cold heading surface 5011 to form the finished core liner 601;

[0063] The sixth cold heading die includes a sixth cold heading die shell 603, a sixth lower die core 6032 located at the upper end of the sixth cold heading die shell 603, and a sixth lower die cavity within the sixth lower die core 6032. The finished product liner 601 is located within the sixth lower die cavity. A sixth lower pad 6033 is located at the lower end of the sixth cold heading die shell 603. The sixth cold heading die shell 603 also includes a sixth lower ejector rod 6031, which passes through the sixth lower pad 6033 and extends into the sixth lower die cavity. The head of the sixth cold heading ejector rod punches the tail of the finished product liner 601. The sixth cold heading die has a scrap surface 604, which is connected to the sixth lower die cavity. During the punching process of the fifth cold heading part, the generated scrap can be discharged from the scrap surface.

[0064] During operation, the first cold heading mold 1 presses the blank 100 through the first upper ejector 1021 to form the first cold heading part 101. The upper end of the first cold heading part 101 forms the first cold heading surface 1011, the center of the first cold heading surface 1011 forms an inverted triangular hole, and the lower end forms the first cold heading rod 1012. Then, the first cold heading part 101 is ejected out of the first lower die core 1032 by the first lower ejector 1031, and the first cold heading part 101 begins to enter the second cold heading mold 2.

[0065] The second cold heading mold 2 punches and presses the first cold heading part 101 through the second upper ejector 2021 to form the second cold heading part 201. The upper end of the second cold heading part 201 forms the second cold heading surface 2011, the center of the second cold heading surface 2011 forms a columnar hole, and the lower end forms the second cold heading rod 2012. Then, the second cold heading part 201 is punched out of the second lower mold core 2032 by the second lower ejector 2031, and the second cold heading part 201 begins to enter the third cold heading mold 3.

[0066] The third cold heading mold 3 punches and presses the second cold heading part 201 through the third upper ejector rod 3021 to form the third cold heading part 301. The upper end of the third cold heading part 301 forms the third cold heading surface 3011. The center of the third cold heading surface 3011 forms a columnar hole that is deeper than the second cold heading surface 2011. The lower end forms the third cold heading rod 3012. Then, the third cold heading part 301 is punched out of the third lower mold core 3032 by the third lower ejector rod 3031. The third cold heading part 301 then enters the fourth cold heading mold 4.

[0067] The fourth cold heading mold 4 punches and presses the third cold heading part 301 through the fourth upper ejector rod 4021 to form the fourth cold heading part 401. The upper end of the fourth cold heading part 401 forms the fourth cold heading surface 4011. The center of the fourth cold heading surface 4011 forms a columnar hole that is deeper than the third cold heading surface 4011. The lower end forms the fourth cold heading rod 4012. Then, the fourth cold heading part 401 is punched out of the fourth lower mold core 4032 by the fourth lower ejector rod 4031. The fourth cold heading part 401 then enters the fifth cold heading mold 5.

[0068] The fifth cold heading mold 5 punches and presses the fourth cold heading part 401 through the fifth upper ejector rod 5021 to form the fifth cold heading part 501. The upper end of the fifth cold heading part 501 forms the fifth cold heading surface 5011. The center of the fifth cold heading surface 5011 forms a columnar hole that is deeper than the fourth cold heading surface 5011. The lower end forms the fifth cold heading rod 5012. Then, the fifth cold heading part 501 is punched out of the fifth lower mold core 5032 by the fifth lower ejector rod 5031. The fifth cold heading part 501 then enters the sixth cold heading mold 6.

[0069] The sixth cold heading die 6 presses the fifth cold heading part 501 through the sixth upper ejector rod 6021 to form a finished liner core 601. A through hole is formed in the center of the finished liner core 601. Then, the finished liner core 601 is ejected from the sixth lower die core 6032 by the sixth lower ejector rod 6031. Finally, the finished liner core 601 is discharged, and the waste material in the center of the finished liner core 601 enters the waste material surface 604 and is discharged.

[0070] The finished lining core 601 has no obvious burrs at the opening position, the opening diameter is 2mm~3mm, the head diameter of the finished lining core 601 is 6mm~9mm, the lower end wall thickness is 0.2mm~0.4mm, and the overall length is 24mm~28mm.

[0071] 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 can be made without departing from the principle of the present utility model, and these improvements should also be considered within the protection scope of the present utility model.

Claims

1. A cold heading die assembly for a core liner, characterized in that, The mold group includes a first cold heading mold (1), a second cold heading mold (2), a third cold heading mold (3), a fourth cold heading mold (4), a fifth cold heading mold (5), and a sixth cold heading mold (6); The first cold heading mold (1) is used to form a first cold heading part (101) from a blank (100). The upper end of the first cold heading part (101) forms a first cold heading surface (1011), and the lower end forms a first cold heading rod (1012). The second cold heading mold (2) is used to form the first cold heading part (101) into the second cold heading part (201), to form the first cold heading surface (1011) into the second cold heading surface (2011), and to form the first cold heading rod (1012) into the second cold heading rod (2012). The third cold heading mold (3) is used to form the second cold heading part (201) into the third cold heading part (301), to form the second cold heading surface (2011) into the third cold heading surface (3011), and to form the second cold heading rod (2012) into the third cold heading rod (3012). The fourth cold heading mold (4) is used to form the third cold heading part (301) into the fourth cold heading part (401), to form the third cold heading surface (3011) into the fourth cold heading surface (4011), and to form the third cold heading rod (3012) into the fourth cold heading rod (4012). The fifth cold heading mold (5) is used to form the fourth cold heading part (401) into the fifth cold heading part (501), to form the fourth cold heading surface (4011) into the fifth cold heading surface (5011), and to form the fourth cold heading rod (4012) into the fifth cold heading rod (5012). The sixth cold heading mold (6) is used to pass through and form the fifth cold heading surface (5011) to finally form the finished liner (601).

2. The cold heading die assembly for a core liner as described in claim 1, characterized in that, The first cold heading die (1) includes a first cold heading upper die and a first cold heading lower die; the first cold heading upper die includes a first cold heading upper die shell (102), and a first upper ejector rod (1021) is provided inside the first cold heading upper die shell (102). The head end face of the first upper ejector rod (1021) corresponds to the shape of the first cold heading surface (1011), and the first cold heading surface (1011) is formed into an inverted triangle shape at the stamping center position; The first cold heading die includes a first cold heading die shell (103), a first lower die core (1032) is provided at the upper end of the first cold heading die shell (103), a first lower die cavity is provided in the first lower die core (1032), and the first cold heading part (101) is provided in the first lower die cavity; a first lower pad block (1033) is provided at the lower end of the first cold heading die shell (103); the first cold heading die shell (103) also includes a first lower push rod (1031), the first lower push rod (1031) passes through the first lower pad block (1033) and extends into the first lower die cavity; the head of the first cold heading lower push rod pushes against the tail of the first cold heading rod (1012).

3. The cold heading die assembly for a core liner as described in claim 2, characterized in that, The second cold heading mold (2) includes a second cold heading upper mold and a second cold heading lower mold; the second cold heading upper mold includes a second cold heading upper mold shell (202), a second upper ejector rod (2021) is provided inside the second cold heading upper mold shell (202), the second upper ejector rod (2021) presses against the first cold heading surface (1011) to form the second cold heading surface (2011); a second upper mold core (2022) is provided inside the second cold heading upper mold shell (202), a second upper mold cavity is provided inside the second upper mold core (2022), and the upper part of the second cold heading part (201) is placed in the second upper mold cavity; The second cold heading die includes a second cold heading die shell (203), a second lower die core (2032) is provided at the upper end of the second cold heading die shell (203), the second lower die core (2032) and the second upper die core (2022) are arranged opposite each other vertically; a second lower die cavity is provided in the second lower die core (2032), and the second cold heading part (201) is provided in the second lower die cavity; a second lower pad block (2033) is provided at the lower end of the second cold heading die shell (203); the second cold heading die shell (203) also includes a second lower push rod (2031), the second lower push rod (2031) passes through the second lower pad block (2033) and extends into the second lower die cavity.

4. The cold heading die assembly for a core liner as described in claim 3, characterized in that, The third cold heading mold (3) includes a third cold heading upper mold and a third cold heading lower mold; the third cold heading upper mold includes a third cold heading upper mold shell (302), and a third upper push rod (3021) is provided inside the third cold heading upper mold shell (302), and the third upper push rod (3021) presses against the second cold heading surface (2011) to form the third cold heading surface (3011); The third cold heading die includes a third cold heading die shell (303), a third lower die core (3032) is provided at the upper end of the third cold heading die shell (303), a third lower die cavity is provided in the third lower die core (3032), and the third cold heading part (301) is provided in the third lower die cavity; a third lower pad block (3033) is provided at the lower end of the third cold heading die shell (303); the third cold heading die shell (303) also includes a third lower push rod (3031), the third lower push rod (3031) passes through the third lower pad block (3033) and extends into the third lower die cavity; the head of the third cold heading push rod pushes against the tail of the third cold heading rod (3012).

5. The cold heading die assembly for a core liner as described in claim 4, characterized in that, The fourth cold heading mold (4) includes a fourth cold heading upper mold and a fourth cold heading lower mold; the fourth cold heading upper mold includes a fourth cold heading upper mold shell (402), and a fourth upper push rod (4021) is provided inside the fourth cold heading upper mold shell (402). The fourth upper push rod (4021) presses against the third cold heading surface (3011) to form the fourth cold heading surface (4011); The fourth cold heading die includes a fourth cold heading die shell (403), a fourth lower die core (4032) is provided at the upper end of the fourth cold heading die shell (403), a fourth lower die cavity is provided in the fourth lower die core (4032), and the fourth cold heading part (401) is located in the fourth lower die cavity; a fourth lower pad (4033) is provided at the lower end of the fourth cold heading die shell (403); the fourth cold heading die shell (403) also includes a fourth lower push rod (4031), the fourth lower push rod (4031) passes through the fourth lower pad (4033) and extends into the fourth lower die cavity; the head of the fourth cold heading push rod pushes against the tail of the fourth cold heading rod (4012).

6. The cold heading die assembly for a core liner as described in claim 5, characterized in that, The fifth cold heading mold (5) includes a fifth cold heading upper mold and a fifth cold heading lower mold; the fifth cold heading upper mold includes a fifth cold heading upper mold shell (502), a fifth upper ejector rod (5021) is provided inside the fifth cold heading upper mold shell (502), the fifth upper ejector rod (5021) presses against the fourth cold heading surface (4011) to form the fifth cold heading surface (5011); a fifth upper mold core (5022) is provided inside the fifth cold heading upper mold shell (502), a fifth upper mold cavity is provided inside the fifth upper mold core (5022), and the upper part of the fifth cold heading part (501) is placed inside the fifth upper mold core (5022); The fifth cold heading die includes a fifth cold heading die shell (503), a fifth lower die core (5032) is provided at the upper end of the fifth cold heading die shell (503), a fifth lower die cavity is provided in the fifth lower die core (5032), and the fifth cold heading part (501) is provided in the fifth lower die cavity; a fifth lower pad block (5033) is provided at the lower end of the fifth cold heading die shell (503); the fifth cold heading die shell (503) also includes a fifth lower push rod (5031), the fifth lower push rod (5031) passes through the fifth lower pad block (5033) and extends into the fifth lower die cavity; the head of the fifth cold heading push rod pushes against the tail of the fifth cold heading rod (5012).

7. The cold heading die assembly for a core liner as described in claim 6, characterized in that, The sixth cold heading mold (6) includes a sixth cold heading upper mold and a sixth cold heading lower mold; the sixth cold heading upper mold includes a sixth cold heading upper mold shell (602), and a sixth upper push rod (6021) is provided inside the sixth cold heading upper mold shell (602). The sixth upper push rod (6021) presses against the fifth cold heading surface (5011) to form the finished product liner (601); The sixth cold heading lower mold includes a sixth cold heading lower mold shell (603), a sixth lower mold core (6032) is provided at the upper end of the sixth cold heading lower mold shell (603), a sixth lower mold cavity is provided in the sixth lower mold core (6032), and the finished product liner (601) is located in the sixth lower mold cavity; a sixth lower pad block (6033) is provided at the lower end of the sixth cold heading lower mold shell (603); the sixth cold heading lower mold shell (603) also includes a sixth lower ejector rod (6031), the sixth lower ejector rod (6031) passes through the sixth lower pad block (6033) and extends into the sixth lower mold cavity; the head of the sixth cold heading lower ejector rod pushes against the tail of the finished product liner (601).

8. The cold heading die assembly for a core liner as described in claim 7, characterized in that, The sixth cold heading die is provided with a scrap surface (604), which is connected to the sixth lower die cavity.

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