Cold heading forming module and cold heading forming process for riveting bolt
By designing the cold heading forming module and process of riveted bolts, the problems of low material utilization, low production efficiency and high cost in the existing production processes are solved, and high efficiency and low cost are achieved for large-scale production of riveted bolts.
Patent Information
- Application Number
- CN202510282151.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2025-05-13
AI Technical Summary
In the existing production process of riveted bolts, the material utilization rate is low, the production efficiency is low, and the cost is high, making it difficult to meet the demand for large-scale supply.
A cold heading forming module for riveted bolts and corresponding processes are designed, and the continuous processing and forming of a variety of molds on the cold heading equipment is achieved to achieve efficient production of riveted bolts.
It achieves high efficiency and continuous production of riveted bolts, with a raw material utilization rate exceeding 99%, greatly saving production costs and suitable for large-scale supply.
Smart Images
Figure CN119973019A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a cold heading forming module for riveted bolts and a cold heading forming process. Background Art
[0002] With the demand for special-shaped connection and fastening of home appliances and new energy vehicles, fastener products with the functions of riveted nuts and bolts have been developed. The riveted bolts that combine the use functions of bolts and rivet nuts have been widely used in home appliances and new energy automobile industries. However, since the early stage was to use special bolts as blanks and then supply products through several machining processes, not only the material utilization rate is low, but also the production efficiency is low and the cost is high, which does not meet the demand for large-scale supply. In order to better bring this product to the market, it is necessary to design a set of manufacturing processes that are completely cold heading. Summary of the invention
[0003] In order to solve the above technical problems, the present invention provides a riveted bolt cold heading forming module with a simple structure, and provides a riveted bolt cold heading forming process with a simple process and high efficiency.
[0004] The technical solution of the present invention to solve the above technical problems is: a riveted bolt cold upsetting forming die set, comprising a rod shrinking die for shrinking the blank, a first upsetting die for pre-upsetting the head of the blank after the rod shrinking, a second upsetting die for further upsetting the blank after the pre-upsetting head, a reverse extrusion die for reverse extruding the blank after the upsetting head, and a flange forming die for pressing a flange on the reverse extruded blank.
[0005] The above-mentioned riveting bolt cold heading forming die set, the rod shrinking die includes a first upper die and a first lower die, the first upper die includes a first upper punch rod, a first upper punch sleeve, a first upper die outer sleeve, and a first upper punch pad, the first upper punch pad is arranged at the upper part of the inner cavity of the first upper die outer sleeve, the first upper punch sleeve is arranged at the lower part of the inner cavity of the first upper die outer sleeve, and the first upper punch rod is sleeved in the first upper punch sleeve; the first lower die includes a first lower die core, a first lower die outer sleeve, a first lower punch rod, a first spring, and a first die sleeve, the first lower die core is arranged at the upper part of the inner cavity of the first lower die outer sleeve, the first die sleeve is clamped at the lower part of the inner cavity of the first lower die outer sleeve, the first lower punch rod is arranged in the first die sleeve, the first lower punch rod is sleeved on the first spring, the two ends of the first spring are respectively fixed on the first lower punch rod and the first die sleeve, the upper end of the first lower punch rod passes through the first die sleeve and extends into the first lower die core.
[0006] The above-mentioned riveted bolt cold upsetting forming die set, the first upsetting die and the second upsetting die have the same structure, the first upsetting die includes a second upper die and a second lower die, the second upper die includes a second upper punch rod, a second upper die sleeve, and a second upper punch pad, a second upper punch pad is arranged at the upper part of the inner cavity of the second upper die sleeve, and a second upper punch rod is arranged at the lower part of the inner cavity of the second upper die sleeve; the second lower die consists of a second lower die core, a second lower die sleeve, a second lower punch rod, a second spring and a second die sleeve, a second lower die core is arranged at the upper part of the inner cavity of the second lower die sleeve, a second die sleeve is clamped at the lower part of the inner cavity of the second lower die sleeve, a second lower punch rod is arranged in the second die sleeve, a second spring is sleeved on the second lower punch rod, two ends of the second spring are respectively fixed on the second lower punch rod and the second die sleeve, and the upper end of the second lower punch rod passes through the second die sleeve and extends into the second lower die core.
[0007] The above-mentioned riveted bolt cold heading forming die set, the reverse extrusion die includes a third upper die and a third lower die, the third upper die includes a third upper punch rod, a third upper die sleeve, a third upper punch pad and a first ejector, a third upper punch pad is arranged at the upper part of the inner cavity of the third upper die sleeve, a third upper punch sleeve is arranged at the lower part of the inner cavity of the third upper die sleeve, the third upper punch rod is sleeved in the third upper punch sleeve, and the lower end of the first ejector passes through the third upper punch pad and is fixedly connected with the third upper punch sleeve; the third lower die includes a third lower die core, a third lower die sleeve, a third lower punch rod, a third spring and a third die sleeve, a third lower die core is arranged at the upper part of the inner cavity of the third lower die sleeve, a third die sleeve is clamped at the lower part of the inner cavity of the third lower die sleeve, a third lower punch rod is arranged in the third die sleeve, a third spring is sleeved on the third lower punch rod, and two ends of the third spring are respectively fixed on the third lower punch rod and the third die sleeve, and the upper end of the third lower punch rod passes through the third die sleeve and extends into the third lower die core.
[0008] The above-mentioned riveting bolt cold heading forming die set, the flange forming die includes a fourth upper die and a fourth lower die, the fourth upper die includes a fourth upper punch rod, a fourth upper die sleeve, a fourth upper punch sleeve, a fourth upper punch pad and a second ejector, a fourth upper punch pad is arranged at the upper part of the inner cavity of the fourth upper die sleeve, a fourth upper punch sleeve is arranged at the lower part of the inner cavity of the fourth upper die sleeve, a fourth upper punch rod is sleeved in the fourth upper punch sleeve, and the lower end of the second ejector passes through the fourth upper punch pad and is fixedly connected with the fourth upper punch sleeve; the fourth lower die includes a fourth lower die core, a fourth lower die sleeve, a fourth lower punch rod, a fourth spring and a fourth die sleeve, a fourth lower die core is arranged at the upper part of the inner cavity of the fourth lower die sleeve, a fourth die sleeve is clamped at the lower part of the inner cavity of the fourth lower die sleeve, a fourth lower punch rod is arranged in the fourth die sleeve, a fourth spring is sleeved on the fourth lower punch rod, two ends of the fourth spring are respectively fixed on the fourth lower punch rod and the fourth die sleeve, and the upper end of the fourth lower punch rod passes through the fourth die sleeve and extends into the fourth lower die core.
[0009] A riveted bolt cold heading forming process comprises the following steps:
[0010] Step 1: Cutting;
[0011] The cutter, die cutter and feeding device cut the material into the specified length according to the length of the material required for molding, forming a cut blank, and then send it to the next station to shrink the rod;
[0012] Step 2: Retract the rod;
[0013] The cut blank is sent to the die opening of the rod shrinking die. The first upper die punches the blank into the first lower die. Then, the first upper punch extrudes the blank to deform it, forming a small rod diameter at the bottom. After reaching the required size of the rod shrinking, the first lower punch pushes the rod shrinking blank out of the first lower die. After the clamp is opened, the blank is clamped by the clamp to prepare for transportation to the next station.
[0014] Step 3: Pre-upsetting the head;
[0015] After the shrinking rod, the blank is translated by the clamp to the die opening of the first upsetting die, the second upper die of the first upsetting die drives the blank into the second lower die of the first upsetting die, and then the blank is deformed by the extrusion of the second upper punch sleeve of the first upsetting die, and the groove shape of the second upper punch of the first upsetting die makes the blank deformed into a preformed upsetting effect, and the second lower punch of the first upsetting die pushes the upsetting blank out of the second lower die of the first upsetting die, and the blank is clamped by the clamp after the clamp is opened, preparing for transportation to the next station;
[0016] Step 4: Upsetting the head;
[0017] After passing through the pre-upsetting head, the blank is translated by the clamp to the die opening of the second upsetting die, the second upper die of the second upsetting die drives the blank into the second lower die of the second upsetting die, and then the blank is deformed by the extrusion of the second upper punch sleeve of the second upsetting die, and the groove of the second upper punch rod of the second upsetting die enables the blank to further achieve the upsetting effect, and the second lower punch rod of the second upsetting die pushes the upsetting blank out of the second lower die of the second upsetting die, and the blank is clamped by the clamp after the clamp is opened, and is prepared for transportation to the next station;
[0018] Step 5: Reverse squeeze the head;
[0019] After the upsetting head, the blank is translated by the clamp to the die mouth of the reverse extrusion die, and the third upper die drives the bottom rod of the blank into the third lower die, and then the blank is deformed in the third upper punch sleeve by the extrusion of the third upper punch rod. In the state where the rear end is stuck, the blank extends in the third upper punch sleeve toward the third upper die. When the third upper die retreats, the blank is separated from the third upper punch sleeve by the first ejector, and the third lower punch rod pushes the reversely extruded blank out of the third lower die. After the clamp is opened, the blank is clamped by the clamp to prepare for transportation to the next station.
[0020] Step 6: Upsetting the flange;
[0021] After back-extrusion, the blank is translated by the clamp to the die opening of the upsetting flange die, and the fourth upper die drives the bottom rod of the blank into the fourth lower die, and then the fourth upper punch sleeve is extruded to extrude the blank with patterns and flanges. When the fourth upper die retreats, the second ejector separates the blank from the fourth upper punch sleeve, and the fourth lower punch rod pushes the back-extruded blank out of the fourth lower die to complete the cold upsetting step.
[0022] The beneficial effect of the present invention is that the cold heading forming process of the present invention adopts a variety of forming dies to carry out continuous processing and forming step by step on the cold heading equipment from cutting, and finally forms a riveted bolt. This cold heading forming process can not only produce efficiently and continuously, but also has the obvious advantage over ordinary machining that no cutting processing is produced, the utilization rate of raw materials exceeds 99%, and the production cost is greatly saved. This low-cost and high-efficiency processing method can achieve faster delivery of large quantities of products. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 The present invention is a schematic structural diagram of a rod shrinking die of a riveting bolt cold heading forming die set.
[0024] Figure 2 It is a structural schematic diagram of the first upsetting die of the riveted bolt cold upsetting forming die set of the present invention.
[0025] Figure 3 It is a schematic structural diagram of the second upsetting die of the cold upsetting forming die set for riveting bolts of the present invention.
[0026] Figure 4 The present invention is a schematic structural diagram of the reverse extrusion die of the riveting bolt cold heading forming die set.
[0027] Figure 5 It is a structural schematic diagram of the flange forming die of the riveting bolt cold heading forming die set of the present invention.
[0028] Figure 6 Schematic diagram of the structure of the riveted bolt.
[0029] Figure 7 for Figure 6 sectional view of .
[0030] Figure 8 Schematic diagram of the cold heading process for riveted bolts. DETAILED DESCRIPTION
[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0032] A riveting bolt cold upsetting forming die set comprises a rod shrinking die for shrinking a blank, a first upsetting die for pre-upsetting a head of the blank after the rod shrinking, a second upsetting die for further upsetting the blank after the pre-upsetting head, a reverse extrusion die for reverse extruding the blank after the upsetting head, and a flange forming die for pressing a flange on the reverse extruded blank.
[0033] like Figure 1 As shown, the rod shrinking mold includes a first upper mold and a first lower mold, the first upper mold includes a first upper punch rod 1, a first upper punch sleeve 2, a first upper mold outer sleeve 3, and a first upper punch pad 4. The first upper punch pad 4 is arranged at the upper part of the inner cavity of the first upper mold outer sleeve 3, and the first upper punch sleeve 2 is arranged at the lower part of the inner cavity of the first upper mold outer sleeve 3. The first upper punch rod 1 is sleeved in the first upper punch sleeve 2; the first lower mold includes a first lower mold core 5, a first lower mold outer sleeve 6, a first lower punch rod 7, a first spring 8, and a first mold sleeve 9. The first lower mold core 5 is arranged at the upper part of the inner cavity of the first lower mold outer sleeve 6, and the first mold sleeve 9 is clamped at the lower part of the inner cavity of the first lower mold outer sleeve 6. The first lower punch rod 7 is arranged in the first mold sleeve 9, and the first spring 8 is sleeved on the first lower punch rod 7. The two ends of the first spring 8 are respectively fixed on the first lower punch rod 7 and the first mold sleeve 9, and the upper end of the first lower punch rod 7 passes through the first mold sleeve 9 and extends into the first lower mold core 5.
[0034] like Figure 2 , Figure 3 As shown, the first upsetting die and the second upsetting die have the same structure. The first upsetting die includes a second upper die and a second lower die. The second upper die includes a second upper punch rod 10, a second upper die sleeve 11, and a second upper punch pad 12. The second upper punch pad 12 is arranged at the upper part of the inner cavity of the second upper die sleeve 11, and the second upper punch rod 10 is arranged at the lower part of the inner cavity of the second upper die sleeve 11; the second lower die consists of a second lower die core 13, a second lower die sleeve 14, a second lower punch rod 15, a second spring 16 and a second die sleeve 17. The second lower die core 13 is arranged at the upper part of the inner cavity of the second lower die sleeve 14, and the second die sleeve 17 is clamped at the lower part of the inner cavity of the second lower die sleeve 14. The second lower punch rod 15 is arranged in the second die sleeve 17, and the second spring 16 is sleeved on the second lower punch rod 15. The two ends of the second spring 16 are respectively fixed on the second lower punch rod 15 and the second die sleeve 17. The upper end of the second lower punch rod 15 passes through the second die sleeve 17 and extends into the second lower die core 13.
[0035] like Figure 4As shown, the reverse extrusion die includes a third upper die and a third lower die, the third upper die includes a third upper punch rod 18, a third upper die sleeve 19, a third upper punch sleeve 20, a third upper punch pad 21 and a first ejector pin 22, the third upper punch pad 21 is arranged at the upper part of the inner cavity of the third upper die sleeve 19, the third upper punch sleeve 20 is arranged at the lower part of the inner cavity of the third upper die sleeve 19, the third upper punch rod 18 is sleeved in the third upper punch sleeve 20, and the lower end of the first ejector pin 22 passes through the third upper punch pad 21 and is fixedly connected to the third upper punch sleeve 20; the third lower die includes a third The lower die core 23, the third lower die sleeve 24, the third lower punch 25, the third spring 26, and the third die sleeve 27. The third lower die core 23 is arranged on the upper part of the inner cavity of the third lower die sleeve 24, the third die sleeve 27 is clamped on the lower part of the inner cavity of the third lower die sleeve 24, the third lower punch 25 is arranged in the third die sleeve 27, the third lower punch 25 is sleeved with the third spring 26, the two ends of the third spring 26 are respectively fixed on the third lower punch 25 and the third die sleeve 27, and the upper end of the third lower punch 25 passes through the third die sleeve 27 and extends into the third lower die core 23.
[0036] like Figure 5 As shown, the flange forming die includes a fourth upper die and a fourth lower die, the fourth upper die includes a fourth upper punch rod 28, a fourth upper die sleeve 29, a fourth upper punch sleeve 30, a fourth upper punch pad 31 and a second ejector pin 32, a fourth upper punch pad 31 is arranged at the upper part of the inner cavity of the fourth upper die sleeve 29, a fourth upper punch sleeve 30 is arranged at the lower part of the inner cavity of the fourth upper die sleeve 29, the fourth upper punch rod 28 is sleeved in the fourth upper punch sleeve 30, and the lower end of the second ejector pin 32 passes through the fourth upper punch pad 31 and is fixedly connected to the fourth upper punch sleeve 30; the fourth lower die includes a fourth The fourth lower die core 33, the fourth lower die sleeve 34, the fourth lower punch 35, the fourth spring 36, and the fourth die sleeve 37. The fourth lower die core 33 is arranged on the upper part of the inner cavity of the fourth lower die sleeve 34, the fourth die sleeve 37 is clamped on the lower part of the inner cavity of the fourth lower die sleeve 34, the fourth lower punch 35 is arranged in the fourth die sleeve 37, the fourth lower punch 35 is sleeved with the fourth spring 36, the two ends of the fourth spring 36 are respectively fixed on the fourth lower punch 35 and the fourth die sleeve 37, and the upper end of the fourth lower punch 35 passes through the fourth die sleeve 37 and extends into the fourth lower die core 33.
[0037] like Figure 6-Figure 8 As shown, a riveted bolt cold heading forming process includes the following steps:
[0038] Step 1: Cutting;
[0039] The cutter, die cutter and feeding device cut the material into the specified length according to the length of the material required for molding, forming a cut blank, and then send it to the next station to shrink the rod;
[0040] Step 2: Retract the rod;
[0041] The cut blank is sent to the die opening of the rod shrinking die, the first upper die punches the blank into the first lower die, and then the blank is deformed by the first upper punch 1 to form a small rod diameter at the bottom. After reaching the required size of the rod shrinking, the first lower punch 7 pushes the rod shrinking blank out of the first lower die, and the blank is clamped by the clamp after the clamp is opened, preparing for transportation to the next station;
[0042] Step 3: Pre-upsetting the head;
[0043] After the shrink rod, the blank is translated by the clamp to the die opening of the first upsetting die, and the second upper die of the first upsetting die drives the blank into the second lower die of the first upsetting die. Then, the blank is deformed by the extrusion of the second upper punch sleeve of the first upsetting die. The groove shape of the second upper punch rod 10 of the first upsetting die makes the blank deform into a preformed upsetting effect. The second lower punch rod 15 of the first upsetting die then pushes the upsetting blank out of the second lower die of the first upsetting die. After the clamp is opened, the blank is clamped by the clamp to prepare for transportation to the next station.
[0044] Step 4: Upsetting the head;
[0045] After passing through the pre-upsetting head, the blank is translated by the clamp to the die opening of the second upsetting die, and the second upper die of the second upsetting die drives the blank into the second lower die of the second upsetting die, and then the blank is deformed by the extrusion of the second upper punch sleeve of the second upsetting die, and the groove of the second upper punch rod 10 of the second upsetting die enables the blank to further achieve the upsetting effect, and the second lower punch rod 15 of the second upsetting die pushes the upsetting blank out of the second lower die of the second upsetting die, and the blank is clamped by the clamp after the clamp is opened, and is prepared for transportation to the next station;
[0046] Step 5: Reverse squeeze the head;
[0047] After the upsetting head, the blank is translated by the clamp to the die mouth of the reverse extrusion die, and the third upper die drives the bottom rod of the blank into the third lower die, and then the blank is deformed in the third upper punch sleeve 20 by the extrusion of the third upper punch rod 18. In the state where the rear end is stuck, the blank extends in the third upper punch sleeve 20 toward the third upper die. When the third upper die retreats, the blank is separated from the third upper punch sleeve 20 by the first ejector pin 22, and the third lower punch rod 25 pushes the reversely extruded blank out of the third lower die. After the clamp is opened, the blank is clamped by the clamp to prepare for transportation to the next station;
[0048] Step 6: Upsetting the flange;
[0049] After reverse extrusion, the blank is translated by the clamp to the die opening of the upsetting flange die, and the fourth upper die drives the bottom rod of the blank into the fourth lower die, and then the fourth upper punch sleeve 30 is extruded to extrude the blank with a pattern and a flange. When the fourth upper die retreats, the second ejector 32 separates the blank from the fourth upper punch sleeve 30, and the fourth lower punch rod 35 pushes the reverse extruded blank out of the fourth lower die, completing the cold upsetting step to obtain the rivet bolt 38.
[0050] Figure 8 From top to bottom, it corresponds to the state of the blank after cutting - shrinking rod - pre-upsetting head - upsetting head - reverse extrusion head - upsetting flange.
Claims
1. A riveting bolt cold heading forming module, characterized in that: It includes a rod shrinking die for shrinking the blank, a first upsetting die for pre-upsetting the head of the blank after the rod shrinking, a second upsetting die for further upsetting the blank after the pre-upsetting head, a reverse extrusion die for reverse extruding the blank after the upsetting head, and a flange forming die for pressing a flange on the reverse extruded blank.
2. The riveting bolt cold heading forming module according to claim 1, characterized in that: The rod shrinking mold includes a first upper mold and a first lower mold. The first upper mold includes a first upper punch rod, a first upper punch sleeve, a first upper mold outer shell, and a first upper punch pad. The first upper punch pad is arranged at the upper part of the inner cavity of the first upper mold outer shell, and the first upper punch sleeve is arranged at the lower part of the inner cavity of the first upper mold outer shell. The first upper punch rod is sleeved in the first upper punch sleeve; the first lower mold includes a first lower mold core, a first lower mold outer shell, a first lower punch rod, a first spring, and a first mold sleeve. The first lower mold core is arranged at the upper part of the inner cavity of the first lower mold outer shell, and the first mold sleeve is clamped at the lower part of the inner cavity of the first lower mold outer shell. The first lower punch rod is arranged in the first mold sleeve, and the first spring is sleeved on the first lower punch rod. The two ends of the first spring are respectively fixed on the first lower punch rod and the first mold sleeve. The upper end of the first lower punch rod passes through the first mold sleeve and extends into the first lower mold core.
3. The riveting bolt cold heading forming module according to claim 1, characterized in that: The first upsetting die and the second upsetting die have the same structure. The first upsetting die includes a second upper die and a second lower die. The second upper die includes a second upper punch rod, a second upper die sleeve, and a second upper punch pad. The second upper punch pad is arranged at the upper part of the inner cavity of the second upper die sleeve, and the second upper punch rod is arranged at the lower part of the inner cavity of the second upper die sleeve; the second lower die consists of a second lower die core, a second lower die sleeve, a second lower punch rod, a second spring, and a second die sleeve. The second lower die core is arranged at the upper part of the inner cavity of the second lower die sleeve, and the second die sleeve is clamped at the lower part of the inner cavity of the second lower die sleeve. The second lower punch rod is arranged in the second die sleeve, and the second spring is sleeved on the second lower punch rod. The two ends of the second spring are respectively fixed on the second lower punch rod and the second die sleeve, and the upper end of the second lower punch rod passes through the second die sleeve and extends into the second lower die core.
4. The riveting bolt cold heading forming module according to claim 1, characterized in that: The reverse extrusion die comprises a third upper die and a third lower die, the third upper die comprises a third upper punch rod, a third upper die sleeve, a third upper punch sleeve, a third upper punch pad and a first ejector pin, a third upper punch pad is arranged at the upper part of the inner cavity of the third upper die sleeve, a third upper punch sleeve is arranged at the lower part of the inner cavity of the third upper die sleeve, a third upper punch rod is sleeved in the third upper punch sleeve, and the lower end of the first ejector pin passes through the third upper punch pad and is fixedly connected with the third upper punch sleeve; the third lower die comprises a third lower die core, a third lower die sleeve, a third lower punch rod, a third spring and a third die sleeve, a third lower die core is arranged at the upper part of the inner cavity of the third lower die sleeve, a third die sleeve is clamped at the lower part of the inner cavity of the third lower die sleeve, a third lower punch rod is arranged in the third die sleeve, a third spring is sleeved on the third lower punch rod, two ends of the third spring are respectively fixed on the third lower punch rod and the third die sleeve, and the upper end of the third lower punch rod passes through the third die sleeve and extends into the third lower die core.
5. The riveting bolt cold heading forming module according to claim 1, characterized in that: The flange forming die comprises a fourth upper die and a fourth lower die, the fourth upper die comprises a fourth upper punch rod, a fourth upper die sleeve, a fourth upper punch sleeve, a fourth upper punch pad and a second ejector, a fourth upper punch pad is arranged at the upper part of the inner cavity of the fourth upper die sleeve, a fourth upper punch sleeve is arranged at the lower part of the inner cavity of the fourth upper die sleeve, a fourth upper punch rod is sleeved in the fourth upper punch sleeve, and the lower end of the second ejector pin passes through the fourth upper punch pad and is fixedly connected with the fourth upper punch sleeve; the fourth lower die comprises a fourth lower die core, a fourth lower die sleeve, a fourth lower punch rod, a fourth spring and a fourth die sleeve, a fourth lower die core is arranged at the upper part of the inner cavity of the fourth lower die sleeve, a fourth die sleeve is clamped at the lower part of the inner cavity of the fourth lower die sleeve, a fourth lower punch rod is arranged in the fourth die sleeve, a fourth spring is sleeved on the fourth lower punch rod, two ends of the fourth spring are respectively fixed on the fourth lower punch rod and the fourth die sleeve, and the upper end of the fourth lower punch rod passes through the fourth die sleeve and extends into the fourth lower die core.
6. A riveted bolt cold heading forming process, applied to the riveted bolt cold heading forming module according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: Cutting; The cutter, die cutter and feeding device cut the material into the specified length according to the length of the material required for molding, forming a cut blank, and then send it to the next station to shrink the rod; Step 2: Retract the rod; The cut blank is sent to the die opening of the rod shrinking die. The first upper die punches the blank into the first lower die. Then, the first upper punch extrudes the blank to deform it, forming a small rod diameter at the bottom. After reaching the required size of the rod shrinking, the first lower punch pushes the rod shrinking blank out of the first lower die. After the clamp is opened, the blank is clamped by the clamp to prepare for transportation to the next station. Step 3: Pre-upsetting the head; After the shrinking rod, the blank is translated by the clamp to the die opening of the first upsetting die, the second upper die of the first upsetting die drives the blank into the second lower die of the first upsetting die, and then the blank is deformed by the extrusion of the second upper punch sleeve of the first upsetting die, and the groove shape of the second upper punch of the first upsetting die makes the blank deformed into a preformed upsetting effect, and the second lower punch of the first upsetting die pushes the upsetting blank out of the second lower die of the first upsetting die, and the blank is clamped by the clamp after the clamp is opened, preparing for transportation to the next station; Step 4: Upsetting the head; After passing through the pre-upsetting head, the blank is translated by the clamp to the die opening of the second upsetting die, the second upper die of the second upsetting die drives the blank into the second lower die of the second upsetting die, and then the blank is deformed by the extrusion of the second upper punch sleeve of the second upsetting die, and the groove of the second upper punch rod of the second upsetting die enables the blank to further achieve the upsetting effect, and the second lower punch rod of the second upsetting die pushes the upsetting blank out of the second lower die of the second upsetting die, and the blank is clamped by the clamp after the clamp is opened, and is prepared for transportation to the next station; Step 5: Reverse squeeze the head; After the upsetting head, the blank is translated by the clamp to the die mouth of the reverse extrusion die, and the third upper die drives the bottom rod of the blank into the third lower die, and then the blank is deformed in the third upper punch sleeve by the extrusion of the third upper punch rod. In the state where the rear end is stuck, the blank extends in the third upper punch sleeve toward the third upper die. When the third upper die retreats, the blank is separated from the third upper punch sleeve by the first ejector, and the third lower punch rod pushes the reversely extruded blank out of the third lower die. After the clamp is opened, the blank is clamped by the clamp to prepare for transportation to the next station. Step 6: Upsetting the flange; After back-extrusion, the blank is translated by the clamp to the die opening of the upsetting flange die, and the fourth upper die drives the bottom rod of the blank into the fourth lower die, and then the fourth upper punch sleeve is extruded to extrude the blank with patterns and flanges. When the fourth upper die retreats, the second ejector separates the blank from the fourth upper punch sleeve, and the fourth lower punch rod pushes the back-extruded blank out of the fourth lower die to complete the cold upsetting step.