Hexagonal head screw bolt cold heading die set with hole

Abstract

The utility model discloses a hexagon head screw bolt cold heading die set with holes, which belongs to the technical field of bolt cold heading dies and 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. A flat upsetting mechanism is arranged in the second cold upsetting die, a punching mechanism is arranged in the third cold upsetting die, a perforating mechanism is arranged in the fourth cold upsetting die, a thread rolling mechanism is arranged in the fifth cold upsetting die, a cutting mechanism is arranged in the sixth cold upsetting die, and grooving, flat upsetting, punching, perforating, thread rolling and cutting forming machining work are conducted respectively. The die is stable in structure, the risks of part cracking and breakage caused by uneven stress distribution due to one-time forming are reduced, the product machining quality is improved, the service life of the die is prolonged, and the pressure on a cold header is relieved.

Description

Technical Field

[0001] The utility model relates to the technical field of bolt cold heading dies, in particular to a hexagonal head screw bolt with hole cold heading die set. Background Art

[0002] When manufacturing large quantities of fasteners, such as bolts, nuts and other parts, in order to achieve less cutting or even no cutting production, the cold heading production process is usually used. The cold heading production process directly forms the required parts through plastic deformation. Compared with the traditional cutting processing method, it reduces a large amount of waste caused by cutting processing and greatly improves the material utilization rate. Since cold heading is a plastic deformation performed at room temperature, the internal structure of the metal can be optimized. Compared with the cut parts, the parts obtained by cold heading have higher tensile strength and toughness. In addition, the cold heading machine usually adopts a continuous, multi-station automated production mode, which can complete multiple processes sequentially on one device and has high production efficiency. However, during the cold heading process, problems such as inadequate deformation control and cracking and breakage of parts may occur. Utility Model Content

[0003] The utility model aims to provide a hexagonal head screw bolt with hole cold heading die set to solve the above problems, through a set of cold heading die sets, the cold heading process is divided into multiple steps, so as to improve the quality of the product.

[0004] Technical solution: The utility model provides a cold heading die set for hexagonal screw bolts with holes, comprising:

[0005] A first cold heading die, wherein the first cold heading die has a first cold heading station in the middle, wherein a blank and a punching hole column are arranged in the first cold heading station, wherein the upper and lower surfaces of the blank are arc-shaped surfaces, and the first cold heading die punches two concave holes in the center of the upper and lower surfaces of the blank through the punching hole column;

[0006] A second cold heading die, wherein the second cold heading die has a second cold heading station in the middle, wherein an upsetting mechanism is provided in the second cold heading station, and the blank after cold heading by the first cold heading die is placed on the upsetting mechanism to upset the arc surface into a flat surface;

[0007] A third cold heading die, wherein the third cold heading die has a third cold heading station in the middle, wherein a punching mechanism is arranged in the third cold heading station, wherein the blank after cold heading by the second cold heading die is placed in the third cold heading station, and the concave hole below the blank is punched inwardly by the punching mechanism;

[0008] A fourth cold heading die, wherein a fourth cold heading station is located in the middle of the fourth cold heading die, a punching mechanism is provided in the fourth cold heading station, a blank that has been cold-headed by the third cold heading die is placed in the fourth cold heading station, and a channel in the middle of the blank is opened by the punching mechanism;

[0009] A fifth cold heading die, the fifth cold heading die is a fifth cold heading station, a thread rolling mechanism is provided in the fifth cold heading station, a blank after cold heading by the fourth cold heading die is placed in the fifth cold heading station, and a thread is processed on the outer periphery of the bolt part of the blank by the thread rolling mechanism;

[0010] The sixth cold heading die, the sixth cold heading die has a sixth cold heading station in the middle, a cutting mechanism is provided in the sixth cold heading station, the sixth cold heading station is provided with a blank after cold heading and thread rolling by the fifth cold heading die, and the round screw head is processed into a hexagonal head by the cutting mechanism.

[0011] Furthermore, in the above-mentioned hexagonal head screw bolt with hole cold heading die set, the first cold heading die comprises:

[0012] A first upper mold, wherein a first pressing channel is provided above the first upper mold, a first upper mold cavity is provided below the first pressing channel, a channel is provided below the first pressing channel, and the channel is connected to the first upper mold cavity;

[0013] A first lower mold, wherein a first lower mold cavity is disposed above the first lower mold, a first upper pressing channel is disposed below the first lower mold, a channel is opened above the first upper pressing channel, and the channel is connected to the first lower mold cavity;

[0014] The first upper die cavity and the first lower die cavity form a first cold forging station, and the forging column includes an upper column and a lower column, wherein the upper column is arranged in the first downward pressing channel and passes through the channel from below to enter the first upper die cavity, and the lower column is arranged in the first upward pressing channel and passes through the channel from above to enter the first lower die cavity. The upper column and the lower column are aligned with the center of the upper and lower surfaces of the blank, and grooves are forged inwardly to facilitate subsequent punching work.

[0015] Furthermore, in the above-mentioned hexagonal head screw bolt with hole cold heading die set, the second cold heading die comprises:

[0016] A second upper mold, wherein the second upper mold is provided with a second downward pressing channel on the upper part and a second upper mold cavity on the lower part, and the second downward pressing channel is communicated with the second upper mold cavity;

[0017] The second lower mold has a second lower mold cavity above the second lower mold and a second upper pressing channel below the second lower mold. A channel is opened above the second upper pressing channel, and the channel is connected to the second lower mold cavity.

[0018] Furthermore, in the above-mentioned cold forging die set for hexagonal screw with hole, the forging mechanism comprises an upsetting upper pressing block and an upsetting lower pressing block, the upsetting upper pressing block is arranged in the second upper die cavity, the upsetting lower pressing block is arranged in the second lower die cavity, and the blank is arranged between the upsetting upper pressing block and the upsetting lower pressing block. The blank is fixed and limited, and the concave surface of the blank is cold forged into a flat surface to ensure the flatness of the cold forged flat surface.

[0019] Furthermore, in the above-mentioned hexagonal head screw bolt with hole cold heading die set, the third cold heading die comprises:

[0020] A third upper mold, wherein a third pressing channel is provided on the upper part of the third upper mold, a third upper mold cavity is provided on the lower part of the third upper mold, and the third pressing channel is communicated with the third upper mold cavity;

[0021] The third lower mold has a third lower mold cavity on its upper side and a third upper pressing channel on its lower side. A channel is opened on the upper side of the third upper pressing channel, and the channel is connected to the third lower mold cavity.

[0022] Furthermore, in the above-mentioned cold heading die set for hexagonal screw with hole bolt, the punching mechanism comprises a punching upper pressing block and a punching drill, the punching upper pressing block is arranged in the third upper die cavity, the punching drill is arranged in the third lower die cavity, a positioning column is arranged in the middle of the punching upper pressing block, the positioning column is aligned with the concave hole above the blank, and the upper drill bit of the punching drill is facing the concave hole below the blank; the blank can be fixed, the stability of the punching process is ensured, the punching accuracy is improved, and the product quality is improved;

[0023] The third upper pressure channel is provided with a third discharge ejector pin, the third lower die cavity is entered from above the third discharge ejector pin, and a buffer device is provided in the third upper pressure channel. The third discharge ejector pin facilitates the discharge work after forming, and the buffer device can relieve the pressure of the third cold heading die and increase the service life of the die.

[0024] Furthermore, in the above-mentioned hexagonal head screw bolt with hole cold heading die set, the fourth cold heading die comprises:

[0025] A fourth upper mold, wherein a fourth downward pressure channel is provided through the middle of the fourth upper mold, a fourth upper film cavity is provided below the fourth upper mold, and the fourth upper film cavity is communicated with the fourth downward pressure channel;

[0026] A fourth lower mold is provided with a fourth lower mold cavity above the fourth lower mold, a fourth upper pressure channel is provided through the middle, the fourth upper pressure channel is connected to the fourth lower mold cavity, and a fourth discharge ejector column is provided below.

[0027] Furthermore, in the above-mentioned cold heading die set for hexagonal screw with hole bolt, the perforating mechanism includes a perforating upper drill and a perforating lower drill, the perforating upper drill is arranged in the fourth downward pressing channel, enters the fourth upper film cavity from below to support the hole above the blank, and the perforating lower drill is arranged in the fourth upward pressing channel, enters the fourth lower die cavity from above to support the hole below the blank, and punches the hole. Aligning the holes from the upper and lower directions ensures that the holes are punched in the same straight line, thereby improving the accuracy of the holes.

[0028] Furthermore, in the above-mentioned hexagonal head screw bolt with hole cold heading die set, the fifth cold heading die comprises:

[0029] A fifth upper die, the fifth upper die presses down the bolt head on the upper part of the blank, a through hole is provided in the middle of the fifth upper die, the through hole is aligned with the middle through hole of the blank, and has the same diameter;

[0030] A fifth lower die, wherein a fifth lower die cavity is disposed above the fifth lower die, a thread rolling mechanism is disposed in the fifth lower die cavity, a fifth upper pressure channel is connected downwardly to the fifth lower die cavity, and a fifth discharge ejector column is disposed in the fifth upper pressure channel.

[0031] Furthermore, in the above-mentioned hexagonal head screw bolt with hole cold heading die set, the sixth cold heading die comprises:

[0032] A sixth upper die, a cutting mechanism is arranged below the sixth upper die, the cutting mechanism has a hexagonal bolt head cutting blade, and the cutting mechanism presses down and aligns with the bolt head above the blank;

[0033] The sixth lower die has a sixth lower die cavity at the bottom, the inner diameter of the sixth lower die cavity is consistent with the diameter of the blank, the sixth lower die cavity is downwardly connected to open a sixth upper pressure channel, a sixth upper pressure column is arranged in the sixth upper pressure channel, the sixth upper pressure column presses the blank upward, and an upper pressure block is arranged at the bottom.

[0034] It can be seen from the above technical scheme that the utility model has the following beneficial effects: the utility model described in the utility model is a hexagonal head screw bolt with a hole cold heading die set, the cold heading forming work of the hexagonal head screw bolt with a hole is divided into six steps, the die structure is stable, each process is carried out steadily, so that the blank is gradually cold headed, and the risk of parts cracking and breaking caused by uneven stress distribution caused by one-time forming is reduced, and the step-by-step cold heading forming can more accurately control the shape and size of the product, improve the product processing quality, and can disperse the deformation to each die of the die set, which can effectively extend the service life of the die and reduce the pressure on the cold heading machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the forming process of each stage of a cold heading die set for a hexagonal screw with a hole bolt according to the utility model;

[0036] Figure 2 This is a schematic diagram of the process flow of a hexagonal head screw with hole bolt cold heading die set of the utility model;

[0037] Figure 3 This is a schematic diagram of the first cold heading die of the utility model;

[0038] Figure 4 This is a schematic diagram of the second cold heading die of the utility model;

[0039] Figure 5 This is a schematic diagram of the third cold heading die of the utility model;

[0040] Figure 6 This is a schematic diagram of the fourth cold heading die of the utility model;

[0041] Figure 7 This is a schematic diagram of the fifth cold heading die of the utility model;

[0042] Figure 8 This is a schematic diagram of the sixth cold heading die of the utility model.

[0043] In the figure: a first cold heading die 1, a first cold heading station 11, a forging hole column 12, a first upper die 13, a first pressing channel 131, a first upper die cavity 132, a first lower die 14, a first lower die cavity 141, a first pressing channel 142, an upper column 121, a lower column 122, a blank 100, a second cold heading die 2, a second cold heading station 21, a flattening mechanism 22, a second upper die 23, and a second pressing channel 23 1. second upper die cavity 232, second lower die 24, second lower die cavity 241, second upper pressing channel 242, upsetting upper pressing block 221, upsetting lower pressing block 222, third cold heading die 3, third cold heading station 31, punching mechanism 32, third upper die 33, third lower pressing channel 331, third upper die cavity 332, third lower die 34, third lower die cavity 341, third upper pressing channel 342, punching upper pressing block 321, punching drill 322, third discharge ejector 343, buffer device 344, fourth cold heading die 4, fourth cold heading station 41, perforating mechanism 42, fourth upper die 43, fourth downward pressure channel 431, fourth upper film cavity 432, fourth lower die 44, fourth lower die cavity 441, fourth upward pressure channel 442, fourth discharge ejector 443, perforating upper drill 421, perforating lower drill 422, fifth cold heading die Tool 5, the fifth cold heading station 51, the thread rolling mechanism 52, the fifth upper die 53, the fifth lower die 54, the fifth lower die cavity 541, the fifth upper pressure channel 542, the fifth discharge ejector pin 543, the sixth cold heading mold 6, the sixth cold heading station 61, the cutting mechanism 62, the sixth upper die 63, the sixth lower die 64, the sixth lower die cavity 641, the sixth upper pressure channel 642, the sixth upper pressure ejector pin 643, and the upper pressure block 644. DETAILED DESCRIPTION

[0044] Example 1

[0045] like Figure 1-2 A hexagonal head screw with hole bolt cold heading die set is shown, comprising:

[0046] A first cold heading die 1, wherein the first cold heading die 1 has a first cold heading station 11 in the middle, wherein a blank 100 and a punching hole column 12 are arranged in the first cold heading station 11, wherein the upper and lower surfaces of the blank 100 are arc-shaped surfaces, and the first cold heading die 1 punches two concave holes in the center of the upper and lower surfaces of the blank 100 through the punching hole column 12;

[0047] A second cold heading die 2, wherein a second cold heading station 21 is disposed in the middle of the second cold heading station 21, and an upsetting mechanism 22 is disposed in the second cold heading station 21, and the blank 100 after cold heading by the first cold heading die 1 is placed on the upsetting mechanism 22, and the arc surface is upset into a flat surface;

[0048] A third cold heading die 3, wherein a third cold heading station 31 is provided in the middle of the third cold heading die 3, a punching mechanism 32 is provided in the third cold heading station 31, a blank 100 after cold heading by the second cold heading die 2 is placed in the third cold heading station 31, and a concave hole below the blank 100 is punched inwardly by the punching mechanism 32;

[0049] A fourth cold heading die 4, wherein a fourth cold heading station 41 is provided in the middle of the fourth cold heading die 4, wherein a punching mechanism 42 is provided in the fourth cold heading station 41, wherein the blank 100 after cold heading by the third cold heading die 3 is placed in the fourth cold heading station 41, and a channel in the middle of the blank 100 is opened by the punching mechanism 42;

[0050] A fifth cold heading die 5, the fifth cold heading die 5 is a fifth cold heading station 51, a thread rolling mechanism 52 is provided in the fifth cold heading station 51, the blank 100 after cold heading by the fourth cold heading die 4 is placed in the fifth cold heading station 51, and the thread rolling mechanism 52 is used to process the outer periphery of the bolt part of the blank 100 into a thread;

[0051] The sixth cold heading die 6 has a sixth cold heading station 61 in the middle thereof, a cutting mechanism 62 is provided in the sixth cold heading station 61, a blank 100 after cold heading and thread rolling by the fifth cold heading die 5 is provided in the sixth cold heading station 61, and a round screw head is processed into a hexagonal head by the cutting mechanism 62.

[0052] like Figure 3 The cold heading die set for hexagonal screw bolt with hole shown in the figure, wherein the first cold heading die 1 comprises:

[0053] A first upper mold 13, wherein a first pressing channel 131 is provided above the first upper mold 13, and a first upper mold cavity 132 is provided below the first pressing channel 131; a channel is opened below the first pressing channel 131, and the channel is connected to the first upper mold cavity 132;

[0054] A first lower mold 14, wherein the first lower mold 14 is provided with a first lower mold cavity 141 on its upper side and a first upper pressing channel 142 on its lower side, wherein a channel is opened on the upper side of the first upper pressing channel 142, and the channel is connected to the first lower mold cavity 141;

[0055] The first upper die cavity 132 and the first lower die cavity 141 form the first cold forging station 11, and the forging column 12 includes an upper column 121 and a lower column 122. The upper column 121 is arranged in the first pressing channel 131, and passes through the channel below to enter the first upper die cavity 132. The lower column 122 is arranged in the first pressing channel 142, and passes through the channel above to enter the first lower die cavity 141. The upper column 121 and the lower column 122 are aligned with the centers of the upper and lower surfaces of the blank 100, and grooves are forged inward to facilitate subsequent punching work.

[0056] like Figure 4 The cold heading die set for a hexagonal screw with a hole is shown, wherein the second cold heading die 2 comprises: The second cold heading die 2 comprises:

[0057] A second upper mold 23, wherein a second pressing channel 231 is provided on the upper portion of the second upper mold 23, and a second upper mold cavity 232 is provided on the lower portion of the second upper mold 23, and the second pressing channel 231 is communicated with the second upper mold cavity 232;

[0058] The second lower mold 24 has a second lower mold cavity 241 on its upper side and a second upper pressing channel 242 on its lower side. A channel is opened on the upper side of the second upper pressing channel 242 , and the channel is connected to the second lower mold cavity 241 .

[0059] like Figure 5 The third cold heading die 3 of the hexagonal screw bolt with hole cold heading die set shown in the figure comprises:

[0060] A third upper mold 33, wherein a third pressing channel 331 is provided on the upper portion of the third upper mold 33, and a third upper mold cavity 332 is provided on the lower portion of the third upper mold 33, and the third pressing channel 331 is communicated with the third upper mold cavity 332;

[0061] The third lower mold 34 has a third lower mold cavity 341 on its upper side and a third upper pressing channel 342 on its lower side. A channel is opened on the upper side of the third upper pressing channel 342 , and the channel is connected to the third lower mold cavity 341 .

[0062] like Figure 6 A hexagonal head screw bolt with hole cold heading die set is shown, the fourth cold heading die 4 comprises: the fourth cold heading die 4 comprises:

[0063] A fourth upper mold 43, wherein a fourth downward pressing channel 431 is provided in the middle of the fourth upper mold 43, and a fourth upper film cavity 432 is provided below the fourth upper mold 43, and the fourth upper film cavity 432 is communicated with the fourth downward pressing channel 431;

[0064] The fourth lower mold 44 has a fourth lower mold cavity 441 on the top and a fourth upper pressure channel 442 running through the middle. The fourth upper pressure channel 442 is connected to the fourth lower mold cavity 441 and a fourth ejection ejector column 443 is provided at the bottom.

[0065] In this embodiment, in the third cold heading die 3 and the fourth cold heading die 4, the diameter of the third upper die 33 is smaller than the inner diameter of the third lower die cavity 341, and the diameter of the fourth upper die 43 is smaller than the fourth lower die cavity 441. The third upper die 33 and the fourth upper die 43 can enter the third lower die cavity 341 and the fourth lower die cavity 441 respectively, thereby improving the structural stability of the upper and lower die clamping during cold heading, improving the cold heading accuracy, and improving the quality of the product.

[0066] Example 2

[0067] On the basis of Example 1, in this example, Figure 4 A hexagonal screw bolt with hole cold forging die set is shown, the upsetting mechanism 22 comprises an upsetting upper pressing block 221 and an upsetting lower pressing block 222, the upsetting upper pressing block 221 is arranged in the second upper die cavity 232, the upsetting lower pressing block 222 is arranged in the second lower die cavity 241, and the blank 100 is arranged between the upsetting upper pressing block 221 and the upsetting lower pressing block 222. The blank 100 is fixed and limited, and the concave surface of the blank 100 is cold forged into a plane to ensure the flatness of the cold forged plane.

[0068] like Figure 5 A hexagonal screw bolt with hole cold heading die set is shown, the punching mechanism 32 includes a punching upper pressing block 321 and a punching drill 322, the punching upper pressing block 321 is arranged in the third upper die cavity 332, the punching drill 322 is arranged in the third lower die cavity 341, a positioning column is arranged in the middle of the punching upper pressing block 321, the positioning column is aligned with the concave hole above the blank 100, and the upper drill bit of the punching drill 322 is facing the concave hole below the blank 100; the blank 100 can be fixed, the stability during the punching process is ensured, the punching accuracy is improved, and the product quality is improved; a third discharge ejector 343 is arranged in the third upper pressing channel 342, the upper part of the third discharge ejector 343 enters the third lower die cavity 341, and a buffer device 344 is arranged in the third upper pressing channel 342. The third discharge ejector 343 facilitates the discharge work after forming, and the buffer device 344 can relieve the pressure of the third cold heading die 3 and improve the service life of the die.

[0069] like Figure 6 A hexagonal screw bolt with hole cold heading die set is shown, the perforating mechanism 42 includes a perforating upper drill 421 and a perforating lower drill 422, the perforating upper drill 421 is arranged in the fourth pressing channel 431, enters the fourth upper film cavity 432 from below to support the hole above the blank 100, and the perforating lower drill 422 is arranged in the fourth pressing channel 442, enters the fourth lower die cavity 441 from above to support the hole below the blank 100, and punches the hole. Aligning the holes from the upper and lower directions ensures that the holes are in the same straight line, thereby improving the accuracy of the holes.

[0070] like Figure 7 A hexagonal head screw bolt with hole cold heading die set is shown, the fifth cold heading die 5 comprises: the fifth cold heading die 5 comprises:

[0071] A fifth upper die 53, wherein the fifth upper die 53 presses down the bolt head on the upper portion of the blank 100, and a through hole is provided in the middle of the fifth upper die 53, and the through hole is aligned with the middle through hole of the blank 100 and has the same diameter;

[0072] The fifth lower die 54 has a fifth lower die cavity 541 above it, a thread rolling mechanism 52 is disposed in the fifth lower die cavity 541 , and the fifth lower die cavity 541 is downwardly connected to a fifth upper pressure channel 542 , and a fifth discharge ejector column 543 is disposed in the fifth upper pressure channel 542 .

[0073] like Figure 8 The sixth cold heading die set for a hexagonal screw with a hole bolt shown in the figure comprises:

[0074] A sixth upper die 63, a cutting mechanism 62 is disposed below the sixth upper die 63, the cutting mechanism 62 has a hexagonal bolt head cutting blade, and the cutting mechanism 62 presses down and aligns with the bolt head above the blank 100;

[0075] The sixth lower die 64 has a sixth lower die cavity 641 at the bottom, the inner diameter of the sixth lower die cavity 641 is consistent with the diameter of the blank 100, the sixth lower die cavity 641 is downwardly connected to form a sixth upper pressure channel 642, a sixth upper pressure column 643 is arranged in the sixth upper pressure channel 642, the sixth upper pressure column 643 presses the blank 100 upward, and an upper pressure block 644 is arranged at the bottom.

[0076] It should be noted that the above is only a technical solution of the utility model and is not a limitation. Although the utility model is described in detail with reference to the preferred embodiments, a person skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A cold heading die set for hexagonal screw bolts with holes, characterized by: include: A first cold heading die (1), wherein the first cold heading die (1) has a first cold heading station (11) in the middle, wherein a blank (100) and a punching hole column (12) are arranged in the first cold heading station (11), wherein the upper and lower surfaces of the blank (100) are arc-shaped surfaces, and the first cold heading die (1) punches two concave holes in the center of the upper and lower surfaces of the blank (100) through the punching hole column (12); A second cold heading die (2), wherein the second cold heading die (2) has a second cold heading station (21) in the middle, and an upsetting mechanism (22) is provided in the second cold heading station (21), and the blank (100) that has been cold-headed by the first cold heading die (1) is placed on the upsetting mechanism (22) to upset the arc-shaped surface into a flat surface; A third cold heading die (3), wherein a third cold heading station (31) is disposed in the middle of the third cold heading die (3), a punching mechanism (32) is disposed in the third cold heading station (31), a blank (100) cold-headed by the second cold heading die (2) is placed in the third cold heading station (31), and a concave hole below the blank (100) is punched inwardly by the punching mechanism (32); A fourth cold heading die (4), wherein a fourth cold heading station (41) is disposed in the middle of the fourth cold heading die (4), wherein a punching mechanism (42) is disposed in the fourth cold heading station (41), wherein the blank (100) cold-headed by the third cold heading die (3) is placed in the fourth cold heading station (41), and a passage in the middle of the blank (100) is opened by the punching mechanism (42); A fifth cold heading die (5), the fifth cold heading die (5) being a fifth cold heading station (51), the fifth cold heading station (51) being provided with a thread rolling mechanism (52), the fifth cold heading station (51) being provided with a blank (100) after being cold headed by the fourth cold heading die (4), and the thread rolling mechanism (52) being used to process the outer periphery of the bolt portion of the blank (100) into threaded threads; A sixth cold heading die (6), wherein the sixth cold heading die (6) has a sixth cold heading station (61) in the middle, wherein a cutting mechanism (62) is provided in the sixth cold heading station (61), wherein the blank (100) after cold heading and thread rolling by the fifth cold heading die (5) is arranged in the sixth cold heading station (61), and the circular screw head is processed into a hexagonal head by the cutting mechanism (62).

2. The cold heading die set for hexagonal screw bolts with holes according to claim 1, characterized in that: The first cold heading die (1) comprises: A first upper mold (13), wherein a first downward pressing channel (131) is provided above the first upper mold (13), and a first upper mold cavity (132) is provided below the first downward pressing channel (131); a channel is opened below the first downward pressing channel (131), and the channel is connected to the first upper mold cavity (132); A first lower mold (14), wherein a first lower mold cavity (141) is provided above the first lower mold (14), and a first upper pressing channel (142) is provided below the first lower mold (14), and a channel is opened above the first upper pressing channel (142), and the channel is connected to the first lower mold cavity (141); The first upper die cavity (132) and the first lower die cavity (141) constitute a first cold forging station (11); the forging hole column (12) comprises an upper column (121) and a lower column (122); the upper column (121) is arranged in the first downward pressing channel (131) and passes through the channel from below to enter the first upper die cavity (132); the lower column (122) is arranged in the first upward pressing channel (142) and passes through the channel from above to enter the first lower die cavity (141).

3. The cold heading die set for hexagonal screw bolts with holes according to claim 1, characterized in that: The second cold heading die (2) comprises: A second upper mold (23), wherein the second upper mold (23) is provided with a second downward pressing channel (231) at the top and a second upper mold cavity (232) at the bottom, and the second downward pressing channel (231) is communicated with the second upper mold cavity (232); A second lower mold (24), wherein the second lower mold (24) is provided with a second lower mold cavity (241) above and a second upper pressure channel (242) below, and a channel is opened above the second upper pressure channel (242), and the channel is connected to the second lower mold cavity (241).

4. The cold heading die set for hexagonal screw bolts with holes according to claim 3, characterized in that: The upsetting mechanism (22) comprises an upsetting upper pressing block (221) and an upsetting lower pressing block (222); the upsetting upper pressing block (221) is arranged in a second upper die cavity (232); the upsetting lower pressing block (222) is arranged in a second lower die cavity (241); and the blank (100) is arranged between the upsetting upper pressing block (221) and the upsetting lower pressing block (222).

5. The cold heading die set for hexagonal screw bolts with holes according to claim 1, characterized in that: The third cold heading die (3) comprises: A third upper mold (33), wherein a third pressing channel (331) is provided on the upper side of the third upper mold (33), and a third upper mold cavity (332) is provided on the lower side of the third upper mold (33), and the third pressing channel (331) is communicated with the third upper mold cavity (332); A third lower mold (34), wherein a third lower mold cavity (341) is provided above the third lower mold (34), and a third upper pressure channel (342) is provided below the third lower mold (34); a channel is opened above the third upper pressure channel (342), and the channel is connected to the third lower mold cavity (341).

6. A hexagonal head screw bolt with hole cold heading die set according to claim 5, characterized in that: The punching mechanism (32) comprises an upper punching block (321) and a punching drill (322), wherein the upper punching block (321) is arranged in the third upper die cavity (332), and the punching drill (322) is arranged in the third lower die cavity (341). A positioning column is arranged in the middle of the upper punching block (321), and the positioning column is aligned with the concave hole above the blank (100), and the upper drill bit of the punching drill (322) faces the concave hole below the blank (100); A third discharge ejector column (343) is arranged in the third upper pressure channel (342), and the third lower mold cavity (341) is entered from above the third discharge ejector column (343). A buffer device (344) is arranged in the third upper pressure channel (342).

7. The cold heading die set for hexagonal screw bolts with holes according to claim 1, characterized in that: The fourth cold heading die (4) comprises: A fourth upper mold (43), wherein a fourth downward pressure channel (431) is provided in the middle of the fourth upper mold (43), a fourth upper film cavity (432) is provided below the fourth upper mold (43), and the fourth upper film cavity (432) is communicated with the fourth downward pressure channel (431); A fourth lower mold (44), wherein a fourth lower mold cavity (441) is provided above the fourth lower mold (44), a fourth upper pressure channel (442) is provided through the middle, the fourth upper pressure channel (442) is connected to the fourth lower mold cavity (441), and a fourth discharge ejector column (443) is provided below.

8. The cold heading die set for hexagonal screw bolts with holes according to claim 7, characterized in that: The perforating mechanism (42) includes an upper perforating drill (421) and a lower perforating drill (422). The upper perforating drill (421) is arranged in the fourth downward pressing channel (431), and enters the fourth upper film cavity (432) from below to press against the hole above the blank (100). The lower perforating drill (422) is arranged in the fourth upper pressing channel (442), and enters the fourth lower mold cavity (441) from above to press against the hole below the blank (100), thereby opening the hole.

9. The cold heading die set for hexagonal screw bolts with holes according to claim 1, characterized in that: The fifth cold heading die (5) comprises: A fifth upper die (53), the fifth upper die (53) pressing downwardly against the bolt head on the upper portion of the blank (100), a through hole being provided in the middle of the fifth upper die (53), the through hole being aligned with the middle through hole of the blank (100) and having the same diameter; A fifth lower die (54), wherein a fifth lower die cavity (541) is disposed above the fifth lower die (54), a thread rolling mechanism (52) is disposed in the fifth lower die cavity (541), the fifth lower die cavity (541) is downwardly connected to a fifth upper pressure channel (542), and a fifth discharge ejector column (543) is disposed in the fifth upper pressure channel (542).

10. The cold heading die set for hexagonal screw bolts with holes according to claim 1, characterized in that: The sixth cold heading die (6) comprises: A sixth upper die (63), a cutting mechanism (62) is arranged below the sixth upper die (63), the cutting mechanism (62) is a hexagonal bolt head cutting knife, and the cutting mechanism (62) is pressed down to align with the bolt head above the blank (100); The sixth lower mold (64) has a sixth lower mold cavity (641) at the bottom, the inner diameter of the sixth lower mold cavity (641) is consistent with the diameter of the blank (100), the sixth lower mold cavity (641) is connected downward to open a sixth upper pressure channel (642), the sixth upper pressure channel (642) has a sixth upper pressure column (643), the sixth upper pressure column (643) presses the blank (100) upward, and an upper pressure block (644) is provided at the bottom.

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