A cold forging process and cold forging device for positioning and adjusting nut

Abstract

The invention relates to a cold heading forming process and a cold heading device for a positioning and adjusting nut. The cold heading device comprises a cutting mechanism, an ejection mechanism, a conveying mechanism and six dies, wherein the cutting mechanism cuts a blank, and the ejection mechanism lifts the blank; the conveying mechanism moves and feeds between the ejection mechanism and the six dies; the six dies comprise: a first heading die for forming a square convex portion on the side of an initial blank and a truncated cone on the bottom, a second heading die for generating a positioning hole on the upper end of an overturned first blank, a third heading die for extruding a second blank and reducing the inclination angle of the truncated cone of the second blank while further deepening the positioning hole at the center of the upper end of the second blank, a fourth heading die for making the square convex portion of the third blank protrude from a plane to form a side convex cone, further reducing the inclination angle of the truncated cone and rounding it, a final heading die for processing a fourth overturned blank to form a finished body flange and forming holes at both ends, and a through hole die for forming a through hole.

Description

Technical Field

[0001] The invention belongs to the field of mechanical technology, and in particular relates to a cold heading forming process and a cold heading device for a positioning and adjusting nut. Background Art

[0002] Automobile chassis adjusting nuts are mainly used to adjust automobile axles, and cooperate with thrust washers to adjust the tightness of bearings or bearing units, and limit the axial movement and rotation of bearings or bearing units to achieve locking.

[0003] Traditional production processes mostly use cold heading blanks + machining, and the size and shape of the finished product are basically guaranteed by machining. This method wastes raw materials seriously, the streamlined structure of the metal is cut off, and the strength of the adjusting nut is weakened; the cost is high, the efficiency is low, the production capacity is small, and the production cycle is long. Summary of the invention

[0004] In summary, in order to overcome the deficiencies of the prior art, the present invention provides a novel cold heading forming device for welding hexagonal flange nuts which saves cost and improves quality.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a cold heading forming process for a positioning and adjusting nut, wherein the cold heading forming process is specifically carried out according to the following steps: 1. Shearing: cutting the wire with scissors to obtain a blank of a required size; 2. First upsetting: forming a square convex portion on the side of the initial blank obtained in step one, and forming a truncated cone portion with a larger upper portion and a smaller lower portion at the bottom of the blank, thereby obtaining a first blank; 3. Second upsetting: the first blank obtained in step two is flipped 180 degrees by a clamp and sent into the cavity of the main mold core of the second upsetting for pre-extrusion, and the punching die and punching rod of the second upsetting form a positioning hole in the center of the upper end of the first blank to form a second blank; 4. Third upsetting: the second blank obtained in step three is translated by a clamp and sent to the cavity of the main mold core of the third upsetting for further calendering and spreading, thereby reducing the thickness of the second blank, reducing the inclination angle of the truncated cone portion of the second blank, and further Deepen to form a third blank; Five, four upsetting: the third blank obtained in step four is translated by the clamp to the cavity of the main mold core of the four upsetting, and is further extruded so that the upper end height of the third blank is lower than the upper end of the square protrusion, and the lower end of the square protrusion is higher than the upper end of the truncated cone, and the truncated cone is extruded and deformed into a cylindrical portion with a rounded corner at the lower end, in preparation for the subsequent cold upsetting of the flange, to obtain the fourth blank; Six, final upsetting: the fourth blank obtained in step five is clamped 180 After being flipped over, it is sent into the cavity of the main mold core of the final forging, the cylindrical part of the fourth blank is formed into a flange, the main mold punch further deepens the positioning hole, and the upper mold punch forms a positioning blind hole in the center of the flange to form a fifth blank; Seven, Punching: The fifth blank is translated into the punching model cavity through the clamp, and the punch connects the positioning blind hole with the positioning hole to form a through hole that meets the requirements. In this process, the other parts do not participate in the deformation, that is, the cold forging of the positioning adjustment nut is completed.

[0006] By adopting the above technical scheme, compared with the existing method of machining the side bosses of the positioning and adjusting nut one by one, the technical scheme of the present invention simplifies the processing technology, saves labor and material costs, greatly improves production efficiency, is suitable for mass production, and cold heading will not destroy the metal streamline, which greatly improves the mechanical properties of the positioning and adjusting nut.

[0007] A cold heading device for positioning and adjusting nuts comprises a cutting mechanism, an ejection mechanism, a conveying mechanism and six dies, wherein the cutting mechanism cuts off a blank, and the ejection mechanism lifts up the blank; the conveying mechanism moves and feeds between the ejection mechanism and the six dies; the six dies comprise: a first heading die for forming a square convex portion on the side of an initial blank and a truncated cone on the bottom, a second heading die for generating a positioning hole at the upper end of an inverted first blank, a third heading die for extruding a second blank and reducing the inclination angle of the truncated cone of the second blank while further deepening the positioning hole at the center of the upper end of the second blank, a fourth heading die for making the square convex portion of the third blank protrude from a plane to form a side convex cone, further reducing the inclination angle of the truncated cone and rounding it, a final heading die for forming a completed flange and forming holes at both ends of the inverted fourth blank, and a through hole die for forming a through hole in a fifth blank.

[0008] By adopting the above technical solution, the one-piece forming of the nut and the boss can be achieved. Compared with machining, the side boss formed by plastic deformation has the advantages of saving materials, complete metal streamlines, and increased part strength. At the same time, it simplifies the processing technology and is suitable for mass production.

[0009] The present invention is further provided that: the six molds each include a main mold and a punch die, the main mold includes a main mold shell, a main mold core, a main mold pad and a main mold punch rod, the main mold core is arranged in the main mold shell, a main mold cavity is arranged in the main mold core, the main mold pad is arranged below the main mold core, one end of the main mold punch rod is fixed on the main mold pad, and the other end passes through the main mold core and extends into the main model cavity; the punch die includes a punch die shell, a punch pad and a punch rod, the punch pad is arranged in the die shell, one end of the punch rod is fixed on the die pad, and the other end passes through the die shell and corresponds to the main model cavity.

[0010] By adopting the above technical scheme, the metal volume is plastically deformed without destroying the properties of the metal, thereby obtaining a processing method with less cutting or no cutting for the required parts, and it is easy to realize mechanized and automated production. The deformation resistance and mold bearing capacity generated during the product deformation process are shared by six molds and six punches, and the blank can be continuously formed without interruption by using mechanical fixtures. The adjusting nut blank is directly formed by six molds and six punches; the die spacer can prevent the die punch rod from being lifted too high, and can also play a role in buffering and protecting the die punch rod.

[0011] The present invention further provides that: a punch rod sleeve is provided between the punch die shell and the punch die rod.

[0012] By adopting the above technical solution, the punch rod sleeve wraps the die punch rod, avoiding the contact between the die punch rod and the mold shell, thereby extending the service life.

[0013] The present invention is further configured as follows: the main model cavity of the first upsetting mold includes a first upper molding cavity for molding a square convex portion and a first lower molding cavity for molding a rounded table; the lower end of the punching die of the second upsetting mold is provided with a conical chamfer for generating a positioning hole at the upper end of the first blank; the main model cavity of the third upsetting mold includes a third upper molding cavity for making the square convex portion fuller and a third lower molding cavity for further compressing the rounded table, and the lower end of the punching die of the third upsetting mold is provided with a conical convex portion for further deepening the positioning hole generated at the upper end of the second blank; the main model cavity of the fourth upsetting mold includes a fourth lower molding cavity for further reducing the inclination angle of the rounded table portion of the third blank and rounding it, and the lower end of the punching die of the fourth upsetting mold corresponds to one of the square convex portions. A forming recess is arranged on the side for forming the side boss of the third blank; the main model cavity of the final upsetting mold includes a fifth upper mold cavity for forming a flange of the fourth blank and a fifth lower molding cavity for maintaining the side boss of the lower end of the fourth blank, the lower end of the punch rod of the final upsetting mold is provided with a first punching convex portion for deepening the positioning hole at the upper end of the fourth blank, the outer sleeve of the punch rod of the final upsetting mold is provided with a sleeve, and the upper end of the main mold punch rod of the final upsetting mold is provided with a second punching convex portion for forming a positioning blind hole at the lower end of the fourth blank; the die shell and the die pad of the through hole mold are provided with a discharge channel for discharging waste, and the die rod of the through hole mold is provided with a hollow channel matched with the main mold punch rod of the through hole mold.

[0014] By adopting the above technical scheme, conical chamfers can be used to pre-extrude shallow holes to prepare for subsequent punching, so that the part boss can be formed more fully; the lower end of the punch rod of the four-upsetting die is provided with a forming recess, and the pressed plane is basically flush, and the side boss can be formed by pressing the punch rod downward a little; the fifth upper cavity of the final upsetting die is used to form the flange. Compared with the existing flanges that are basically formed in the lower model cavity, the technical scheme of the present invention is more easily stressed and reduces the resistance to forming; the hollow channel and the discharge channel are used to discharge the waste generated by punching; and the side boss is gradually formed by three upsetting and four upsetting, which reduces the bearing pressure of the die and extends the service life of the die. At the same time, the side boss of the part is formed more fully, and the product molding quality is higher (the existing cold upsetting method has the problem that the side boss of the part is difficult to form or cracks will appear at the junction of the side boss and the outer circular contour, and the flange is difficult to form).

[0015] The present invention further provides that: the inclination angle of the hypotenuse of the first lower molding cavity is 8°-12°.

[0016] By adopting the above technical solution, good packing force is provided, making the positioning more stable.

[0017] The present invention further provides that: the surface of the punching die and punching rod is provided with a titanium coating.

[0018] By adopting the above technical scheme, since the third upsetting further rolls and spreads the second blank, the thickness of the second blank is reduced, the inclination angle of the truncated cone portion of the second blank is reduced, and the positioning hole in the center of the upper end of the second blank is further deepened to form a third blank; the surface of the punch and rod of the third upsetting mold is provided with a titanium coating to increase its hardness, improve the bearing capacity of the mold, and thus improve the plasticity of the third upsetting mold.

[0019] The present invention further provides that: the inner diameter of the fifth upper molding cavity is greater than or equal to the maximum distance between the central axis of the fifth lower molding cavity and its side wall.

[0020] By adopting the above technical solution, the blank is naturally shaped by the upward force outside the mold through the plasticity of the metal, thereby increasing the utilization rate of the material, improving the surface quality of the part, and improving the strength and organizational properties of the part.

[0021] The present invention further provides that: the main die pad of the final forging die is provided with an exhaust hole.

[0022] By adopting the above technical solution, the airflow in the mold can be easily discharged to avoid affecting the forming of parts.

[0023] The present invention further provides that: the conveying mechanism comprises a clamp, and square grooves matching the square protrusions are arranged on both sides of the clamp.

[0024] By adopting the above technical solution, the clamp is specially provided with corresponding square grooves compared with general clamps, which are used to cooperate with the bosses of parts and play a role in positioning the process parts and molds during the production process.

[0025] The examples describe specific embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of a cold heading forming process according to an embodiment of the present invention;

[0027] Figure 2 It is a cross-sectional view of a cold heading device according to an embodiment of the present invention;

[0028] Figure 3 for Figure 2 A magnified view of part A;

[0029] Figure 4 for Figure 2 A magnified view of part B;

[0030] Figure 5 for Figure 2 Enlarged view of part C;

[0031] Figure 6 for Figure 2 A magnified view of the D portion;

[0032] Figure 7 for Figure 2 A magnified view of part E;

[0033] Figure 8 for Figure 2 Magnified view of part F;

[0034] Fig. 9 It is a structural diagram of clamps at different workstations according to an embodiment of the present invention.

[0035] Figure numerals: 1. a forging die, 11. a main die of a forging die, 111. a main die shell of a forging die, 112. a main die core of a forging die, 113. a main die pad of a forging die, 114. a main die punch of a forging die, 115. a main mold cavity of a forging die, 1151. a first upper molding cavity, 1152. a first lower molding cavity, 12. a punch of a forging die, 121. a punch shell of a forging die, 122. Die pad of upsetting die, 123. Die punch of upsetting die, 124. Punch rod sleeve, 2. Upsetting die, 21. Die punch of upsetting die, 211. Conical chamfer, 3. Upsetting die, 31. Main mold cavity of upsetting die, 311. Third upper forming cavity, 312. Third lower forming cavity, 32. Die punch of upsetting die, 321. Conical convex part, 4. Upsetting die, 41. Main mold cavity of upsetting die, 411. The fourth lower forming cavity, 42. The punch and punch of the fourth upsetting die, 421. The forming concave portion, 5. The final upsetting die, 51. The main mold cavity of the final upsetting die, 511. The fifth upper cavity, 512. The fifth lower forming cavity, 513. The punch and punch of the final upsetting die, 5131. The first punching convex portion, 514. The sleeve, 52. The main die punch of the final upsetting die, 521. The second punching convex portion, 53. The main die pad of the final upsetting die, 531. vent hole, 6. through hole mold, 61. die shell of through hole mold, 62. die pad, 621. discharge channel, 63. die punch of through hole mold, 631. hollow channel, 64. main die punch of through hole mold, 7. blank, 71. square convex part, 72. round table, 73. positioning hole, 74. side boss, 75. positioning blind hole, 76. flange, 77. through hole, 8. clamp, 81. square groove. DETAILED DESCRIPTION

[0036] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0037] See attached Figure 1The present embodiment discloses a cold forging process for a positioning and adjusting nut. The cold forging process is specifically performed in the following steps: 1. Shearing: Cutting the wire with scissors to obtain a blank 7 of a required size; 2. First forging: Forming a square convex portion 71 on the side of the initial blank 7 obtained in step 1, and forming a round table 72 with a larger top and a smaller bottom at the bottom of the blank 7, thereby obtaining a first blank 7; 3. Second forging: The first blank 7 obtained in step 2 is turned over by the clamp 8 by 180 degrees and then fed into the second forging The cavity of the main mold core is pre-extruded, and the punch of the second upsetting die punch forms a positioning hole 73 at the center of the upper end of the first blank 7 to form the second blank 7; Fourth, third upsetting: the second blank 7 obtained in step three is translated by the clamp 8 to the cavity of the main mold core of the third upsetting, and is further rolled and spread to reduce the thickness of the second blank 7, and at the same time reduce the inclination angle of the truncated cone 72 of the second blank 7, and at the same time further deepen the positioning hole 73 at the center of the upper end of the second blank 7 to form the third blank 7; Fifth 1. Fourth upsetting: The third blank 7 obtained in step 4 is translated by the clamp 8 and sent to the cavity of the main mold core of the fourth upsetting, and is further extruded, so that the upper end height of the third blank 7 is lower than the upper end of the square protrusion 71, and the lower end of the square protrusion 71 is higher than the upper end of the round table 72, and the round table 72 is extruded and deformed into a cylindrical part with a rounded corner at the lower end, so as to prepare for the subsequent cold upsetting of the flange 76, and obtain the fourth blank 7; 6. Final upsetting: The fourth blank 7 obtained in step 5 is turned by the clamp 8 180 degrees and sent into The cavity of the main mold core of the final forging, the cylindrical part of the fourth blank 7 is formed into a flange 76, the main mold punch further deepens the positioning hole 73, and the upper mold punch forms a positioning blind hole 75 at the center of the flange 76 to form the fifth blank 7; Seven, Punching: The fifth blank 7 is translated into the punching model cavity through the clamp 8, and the punch connects the positioning blind hole 75 with the positioning hole 73 to form a through hole 77 that meets the requirements. In this process, the remaining parts do not participate in the deformation, that is, the cold forging of the positioning adjustment nut is completed.

[0038] See attached Figure 1-9The present embodiment discloses a cold forging device for positioning and adjusting nuts, comprising a cutting mechanism, an ejection mechanism, a conveying mechanism and six dies, wherein the cutting mechanism cuts off a blank 7, and the ejection mechanism lifts up the blank 7; the conveying mechanism moves and feeds between the ejection mechanism and the six dies; the six dies comprise: a forging die 1 for forming a square convex portion 71 on the side of the initial blank 7 and a round table 72 on the bottom, a second forging die 2 for forming a positioning hole 73 on the upper end of the flipped first blank 7 , a three-upsetting die 3 for extruding the second blank 7 and reducing the inclination angle of the truncated cone 72 of the second blank 7 while further deepening the positioning hole 73 in the center of the upper end of the second blank 7; a four-upsetting die 4 for making the square protrusion 71 of the third blank 7 protrude from the plane to form a side protrusion 74 and further reducing the inclination angle of the truncated cone 72 and rounding it; a final upsetting die 5 for processing the flipped fourth blank 7 to form a completed flange 76 with holes at both ends; and a through-hole die 6 for forming a through-hole 77 in the fifth blank 7.

[0039] This embodiment is further configured as follows: the six molds each include a main mold and a punch die, the main mold includes a main mold shell, a main mold core, a main mold pad and a main mold punch rod, the main mold core is arranged in the main mold shell, a main mold cavity is arranged in the main mold core, the main mold pad is arranged below the main mold core, one end of the main mold punch rod is fixed on the main mold pad, and the other end passes through the main mold core and extends into the main mold cavity; the punch die includes a punch die shell, a die pad 62 and a punch die rod, the die pad 62 is arranged in the die shell, one end of the punch die rod is fixed on the die pad 62, and the other end passes through the die shell and corresponds to the main model cavity.

[0040] This embodiment further provides that: a punch rod sleeve 124 is provided between the die shell and the die punch rod.

[0041] The present embodiment is further configured as follows: the main mold cavity 115 of the first upsetting mold 1 includes a first upper molding cavity 1151 for molding the square protrusion 71 and a first lower molding cavity 1152 for molding the rounded table 72; the lower end of the punch and punch rod 21 of the second upsetting mold 2 is provided with a conical chamfer 211 for generating a positioning hole 73 at the upper end of the first blank 7; the main mold cavity 31 of the third upsetting mold 3 includes a third upper molding cavity 311 for making the square protrusion 71 fuller and a third lower molding cavity 312 for further compressing the rounded table 72, and the lower end of the punch and punch rod 32 of the third upsetting mold 3 is provided with a conical protrusion 321 for further deepening the positioning hole 73 generated at the upper end of the second blank 7; the main mold cavity 41 of the fourth upsetting mold 4 includes a fourth lower molding cavity 411 for further reducing the inclination angle of the rounded table 72 of the third blank 7 and rounding it, and the lower end of the punch and punch rod 42 of the fourth upsetting mold 4 is provided with a side corresponding to the square protrusion 71 The main mold cavity 51 of the final upsetting die 5 includes a fifth upper cavity 511 for forming the flange 76 of the fourth blank 7 and a fifth lower molding cavity 512 for holding the side boss 74 at the lower end of the fourth blank 7. The lower end of the punch rod 513 of the final upsetting die 5 is provided with a first punching convex portion 5131 for deepening the positioning hole at the upper end of the fourth blank. A sleeve 514 is arranged between the die punch rod 513 and the punch rod sleeve 124, and the upper end of the main die punch rod 52 of the final forging die 5 is provided with a second punching protrusion 521 for generating a positioning blind hole 75 at the lower end of the fourth blank 7; the die shell 61 and the die pad 62 of the through hole die 6 are provided with a discharge channel 621 for discharging waste materials, and the die punch rod 63 of the through hole die 6 is provided with a hollow channel 631 adapted to the main die punch rod 64 of the through hole die 6.

[0042] This embodiment further provides that: the inclination angle of the hypotenuse of the first lower molding cavity 1152 is 8°-12°.

[0043] This embodiment further provides that: the surface of the die punch rod 32 is provided with a titanium coating.

[0044] This embodiment further provides that: the inner diameter of the fifth upper molding cavity 511 is greater than or equal to the maximum distance between the central axis of the fifth lower molding cavity 512 and its side wall.

[0045] This embodiment further provides that: the main die pad 53 of the final upsetting die 5 is provided with an exhaust hole 531 .

[0046] This embodiment further provides that: the conveying mechanism includes a clamp 8 , and square grooves 81 matching with the square protrusions 71 are provided on both sides of the clamp 8 .

[0047] The above-mentioned "between" does not only refer to the direction and position, but also includes the interaction between different parts. The above-mentioned "upper end", "middle end" and "lower end" are only relative positions for the convenience of explanation, and does not exclude the possibility of using other terms.

[0048] Although this article uses more: an upsetting die 1, a main die 11 of an upsetting die, a main mold cavity 111 of an upsetting die, a main mold core 112 of an upsetting die, a main mold pad 113 of an upsetting die, a main mold punch 114 of an upsetting die, a main mold cavity 115 of an upsetting die, a first upper molding cavity 1151, a first lower molding cavity 1152, a punch 12 of an upsetting die, an upsetting die A die shell 121, a die pad 122 of a first upsetting die, a die punch 123 of a first upsetting die, a punch sleeve 124, a second upsetting die 2, a die punch 21 of the second upsetting die 2, a conical chamfer 211, a third upsetting die 3, a main mold cavity 31 of the third upsetting die 3, a third upper molding cavity 311, a third lower molding cavity 312, a die punch 32 of the third upsetting die 3, and a conical convex portion 321 , four upsetting molds 4, the main model cavity 41 of the four upsetting molds 4, the fourth lower forming cavity 411, the die punch rod 42 of the four upsetting molds 4, the forming recess 421, the final upsetting mold 5, the main model cavity 51 of the final upsetting mold, the fifth upper cavity 511, the fifth lower forming cavity 512, the main mold punch rod 52 of the final upsetting mold, the second punching convex portion 521, the main mold pad 53 of the final upsetting mold, the exhaust hole 531, the through hole mold 6, the die shell 61 of the through hole 77 mold, the die pad 62, the discharge channel 621, the die punch rod 63 of the through hole 77 mold, the hollow channel 631, the blank 7, the square convex portion 71, the round table 72, the positioning hole 73, the side boss 74, the positioning blind hole 75, the through hole 77, the clamp 8, the square groove 81 and other terms, but the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; any additional limitations interpreted as them are contrary to the spirit of the present invention.

Claims

1. A cold heading forming process for a positioning and adjusting nut, characterized in that: The cold upsetting forming process is specifically carried out according to the following steps:

1. Shearing: Cut the wire with scissors to obtain a blank of the required size; 2. First upsetting: Form a square convex portion on the side of the initial blank obtained in step 1, and form a truncated cone portion with a larger upper part and a smaller lower part at the bottom of the blank, thereby obtaining a first blank; 3. Second upsetting: The first blank obtained in step 2 is flipped 180 degrees by the clamp and sent into the cavity of the main mold core of the second upsetting for pre-extrusion. The punching die and punching rod of the second upsetting form a positioning hole in the center of the upper end of the first blank to form a second blank; 4. Third upsetting: The second blank obtained in step 3 is translated by the clamp into the cavity of the main mold core of the third upsetting for further calendering and spreading, so that the thickness of the second blank is reduced, and the inclination angle of the truncated cone portion of the second blank is reduced, and the positioning hole in the center of the upper end of the second blank is further deepened to form a third blank; 5. Fourth upsetting: After step The third blank obtained in step 4 is translated by the clamp to the cavity of the main mold core of the fourth forging, and is further extruded so that the upper end height of the third blank is lower than the upper end of the square protrusion, and the lower end of the square protrusion is higher than the upper end of the truncated cone, and the truncated cone is extruded and deformed into a cylindrical portion with a rounded corner at the lower end, in preparation for the subsequent cold forging of the flange, to obtain the fourth blank; 6. Final forging: the fourth blank obtained in step 5 is flipped 180 degrees by the clamp and sent to the cavity of the main mold core of the final forging, the cylindrical portion of the fourth blank is formed into a flange, the main mold punch further deepens the positioning hole, and the upper mold punch forms a positioning blind hole in the center of the flange to form the fifth blank; 7. Punching: the fifth blank is translated by the clamp to the punching model cavity, and the punch connects the positioning blind hole with the positioning hole to form a through hole that meets the requirements. In this process, the remaining parts do not participate in the deformation, that is, the cold forging of the positioning adjustment nut is completed.

2. A cold heading device for positioning and adjusting nuts, characterized in that: It comprises a cutting mechanism, an ejection mechanism, a conveying mechanism and six moulds, wherein the cutting mechanism cuts the blank, and the ejection mechanism lifts the blank; the conveying mechanism moves and feeds between the ejection mechanism and the six moulds; the six moulds comprise: a first upsetting mould for forming a square convex portion on the side of the initial blank and a truncated cone on the bottom, a second upsetting mould for generating a positioning hole at the upper end of the flipped first blank, a third upsetting mould for extruding the second blank and reducing the inclination angle of the truncated cone of the second blank while further deepening the positioning hole at the center of the upper end of the second blank, a fourth upsetting mould for making the square convex portion of the third blank protrude from the plane to form a side convex cone, further reducing the inclination angle of the truncated cone and rounding it, a final upsetting mould for forming a completed flange and holes at both ends of the flipped fourth blank, and a through-hole mould for forming a through-hole in the fifth blank.

3. A cold heading device for positioning and adjusting nuts according to claim 2, characterized in that: The six molds all include a main mold and a punch die. The main mold includes a main mold shell, a main mold core, a main mold pad and a main mold punch rod. The main mold core is arranged in the main mold shell. A main mold cavity is arranged in the main mold core. The main mold pad is arranged below the main mold core. One end of the main mold punch rod is fixed on the main mold pad, and the other end passes through the main mold core and extends into the main mold cavity; the punch die includes a punch die shell, a punch pad and a punch die rod. The punch pad is arranged in the die shell. One end of the punch die rod is fixed on the punch pad, and the other end passes through the die shell and corresponds to the main model cavity.

4. A cold heading device for positioning and adjusting nuts according to claim 3, characterized in that: A punch rod sleeve is arranged between the punch die shell and the punch die rod.

5. The cold heading device for positioning and adjusting nuts according to claim 3, characterized in that: The main mold cavity of the first upsetting mold includes a first upper molding cavity for molding a square convex portion and a first lower molding cavity for molding a rounded table; the lower end of the punching die of the second upsetting mold is provided with a conical chamfer for generating a positioning hole at the upper end of the first blank; the main mold cavity of the third upsetting mold includes a third upper molding cavity for making the square convex portion fuller and a third lower molding cavity for further compressing the rounded table, and the lower end of the punching die of the third upsetting mold is provided with a conical convex portion for further deepening the positioning hole generated at the upper end of the second blank; the main mold cavity of the fourth upsetting mold includes a fourth lower molding cavity for further reducing the inclination angle of the rounded table portion of the third blank and rounding it, and the lower end of the punching die of the fourth upsetting mold is provided with a A molding recess is used to form the side boss of the third blank; the main mold cavity of the final upsetting mold includes a fifth upper mold cavity for forming a flange of the fourth blank and a fifth lower molding cavity for maintaining the side boss of the lower end of the fourth blank; the lower end of the punch and punch rod of the final upsetting mold is provided with a first punching convex portion for generating a positioning blind hole at the upper end of the fourth blank; the outer sleeve of the punch and punch rod of the final upsetting mold is provided with a sleeve; the upper end of the main mold and punch rod of the final upsetting mold is provided with a second punching convex portion for deepening the positioning hole at the lower end of the fourth blank; the die shell and the die pad of the through hole mold are provided with a discharge channel for discharging waste, and the die and punch rod of the through hole mold is provided with a hollow channel matched with the main mold and punch rod of the through hole mold.

6. A cold heading device for positioning and adjusting nuts according to claim 5, characterized in that: The inclination angle of the hypotenuse of the first lower molding cavity is 8°-12°.

7. A cold heading device for positioning and adjusting nuts according to claim 5, characterized in that: The surface of the punching die and punching rod is provided with a titanium coating.

8. The cold heading device for positioning and adjusting nuts according to claim 5, characterized in that: The inner diameter of the fifth upper molding cavity is greater than or equal to the maximum distance between the central axis of the fifth lower molding cavity and its side wall.

9. The cold heading device for positioning and adjusting nuts according to claim 3, characterized in that: The main die pad of the final forging die is provided with an exhaust hole.

10. A cold heading device for positioning and adjusting nuts according to claim 2, characterized in that: The conveying mechanism comprises a clamp, and square grooves matching with the square protrusions are arranged on both sides of the clamp.

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