阅读说明：本技术 一种偏心调整螺栓的模具组件及偏心调整螺栓的成型方法 (Mold assembly of eccentric adjusting bolt and molding method of eccentric adjusting bolt ) 是由 郑守田 陆包菊 唐国浩 熊伟 于 2020-05-12 设计创作，主要内容包括：本发明提出了一种偏心调整螺栓的模具组件,包括阳模座及阴模座,所述阳模座上沿工位递进方向依次设置有阳预镦模、阳镦圆头模、阳缩螺纹坯径模、阳成型双槽模及阳切偏心盘模；所述阴模座上沿工位递进方向依次设置有阴预镦模、阴镦圆头模、阴缩螺纹坯径模、阴成型双槽模及阴切偏心盘模；所述阳预镦模与阴预镦模得到预镦坯件,所述阳镦圆头模与阴镦圆头模得到圆头坯件,所述阳缩螺纹坯径模与阴缩螺纹坯径模得到缩螺纹坯径坯件,所述阳成型双槽模与阴成型双槽模得到成型双槽坯件,所述阳切偏心盘模与阴切偏心盘模得到偏心盘坯件。本发明具有将偏心法兰结构和偏心垫片导轨一次成型,减少偏心法兰的冲压和铆压,减少偏心垫片导轨的切削的优点。(The invention provides a die assembly for an eccentric adjusting bolt, which comprises a male die holder and a female die holder, wherein a male pre-upsetting die, a male upsetting round-head die, a male shrinking thread blank diameter die, a male forming double-groove die and a male cutting eccentric disc die are sequentially arranged on the male die holder along the progressive direction of a station; a female pre-upsetting die, a female upsetting round head die, a female reducing thread blank diameter die, a female forming double-groove die and a female cutting eccentric disc die are sequentially arranged on the female die holder along the station progressive direction; the positive pre-upsetting die and the negative pre-upsetting die obtain pre-upsetting blanks, the positive upsetting round head die and the negative upsetting round head die obtain round-head blanks, the positive shrinkage thread blank diameter die and the negative shrinkage thread blank diameter die obtain shrinkage thread blank diameter blanks, the positive forming double-groove die and the negative forming double-groove die obtain forming double-groove blanks, and the positive cutting eccentric disc die and the negative cutting eccentric disc die obtain eccentric disc blanks. The invention has the advantages that the eccentric flange structure and the eccentric gasket guide rail are molded at one time, the punching and riveting of the eccentric flange are reduced, and the cutting of the eccentric gasket guide rail is reduced.)

1. The utility model provides an eccentric adjusting bolt's mould subassembly, includes positive die holder and negative die holder, its characterized in that: a male pre-upsetting die, a male upsetting round head die, a male reducing thread blank diameter die, a male forming double-groove die and a male cutting eccentric disc die are sequentially arranged on the male die holder along the station progressive direction; a female pre-upsetting die, a female upsetting round head die, a female reducing thread blank diameter die, a female forming double-groove die and a female cutting eccentric disc die are sequentially arranged on the female die holder along the station progressive direction; when the male die base and the female die base are matched in die, the male pre-upsetting die and the female pre-upsetting die are used for pre-upsetting bolt blanks to obtain pre-upsetting blanks, the male upsetting round head die and the female upsetting round head die are used for upsetting round head blanks to obtain round head blanks, the male reducing thread blank diameter die and the female reducing thread blank diameter die are used for reducing the thread blank diameter to the round head blanks to obtain reducing thread blank diameter blanks, the male forming double-groove die and the female forming double-groove die are used for forming double grooves to the reducing thread blank diameter blanks to obtain forming double-groove blanks, and the male cutting eccentric disc die and the female cutting eccentric disc die are used for cutting eccentric discs to the forming double-groove blanks to obtain eccentric disc blanks.

2. The die assembly for eccentric adjustment of a bolt of claim 1, wherein: the male die comprises a male die base and is characterized in that a plurality of male die external members are sequentially arranged on the male die base along the progressive direction of stations, and a male pre-upsetting die, a male upsetting round head die, a male shrinkage thread blank diameter die, a male forming double-groove die and a male cutting eccentric disc die are respectively arranged in each male die external member in a one-to-one mode and are detachably connected with the male die base through the male die external members.

3. An eccentric adjusting bolt die assembly according to claim 1 or 2, wherein: a plurality of female die external members are sequentially arranged on the female die holder along the station progressive direction, and the female pre-upsetting die, the female upsetting round-head die, the female shrinkage thread blank diameter die, the female forming double-groove die and the female cutting eccentric disc die are respectively arranged in each female die external member in a one-to-one manner and are detachably connected with the female die holder through the female die external members.

4. The die assembly for eccentric adjustment of a bolt of claim 1, wherein: the male pre-upsetting die is cylindrical, a first through hole is formed in the female pre-upsetting die, a pre-upsetting hole is formed in the upper end of the first through hole, and the male pre-upsetting die is inserted into the pre-upsetting hole of the female pre-upsetting die to pre-upset the bolt blank during die assembly; the pre-upsetting blank is subjected to upsetting by the aid of the upsetting circular holes, and is subjected to upsetting by the upsetting circular holes; the male-shrinkage threaded blank diameter die is provided with a screw head hole for upsetting a screw head, the female-shrinkage threaded blank diameter die is provided with a third through hole, the upper end of the third through hole is provided with a male-shrinkage threaded hole, and the screw head hole and the male-shrinkage threaded hole are buckled to perform thread-shrinkage blank diameter on a round-head blank during die assembly; the male forming double-groove die is provided with a flange hole for accommodating a screw head, the female forming double-groove die is provided with a fourth through hole, and the male forming double-groove die and the female forming double-groove die are close to each other during die assembly to form double grooves for a reduced thread blank diameter blank; the male cutting eccentric disc die is provided with a cutter part, the female cutting eccentric disc die is provided with a fifth through hole, and the cutter part on the male cutting eccentric disc die abuts against the female cutting eccentric disc die to cut an eccentric disc on the formed double-groove blank when the dies are closed.

5. An eccentric adjustment bolt die assembly as defined in claim 4 wherein: the diameter of the first through hole is 68% -73% of that of the pre-heading hole, and the diameter of the pre-heading hole is larger than that of the bolt blank.

6. An eccentric adjustment bolt die assembly as defined in claim 5, wherein: the diameter of the pre-heading hole is larger than the diameter of the bolt blank by 0.1 mm.

7. An eccentric adjustment bolt die assembly as defined in claim 4 wherein: and the diameter of the third through hole is 1.1mm smaller than that of the male shrinkage threaded hole.

8. A molding method for producing an eccentric adjusting bolt by using the mold assembly for eccentric adjusting bolt of claims 1-4, comprising the steps of:

s1, pre-upsetting: transferring a bolt blank between a male pre-upsetting die and a female pre-upsetting die, and extruding the blank piece into the female pre-upsetting die by the male pre-upsetting die under a vertically downward pressure to obtain a pre-upsetting blank;

s2, upsetting a round head: conveying the pre-upset blank between a male upsetting round head die and a female upsetting round head die, and extruding the pre-upset blank into the female upsetting round head die by the male upsetting round head die under a vertically downward pressure to obtain a round head blank;

s3, reducing the diameter of the thread blank: transferring the round-head blank between a male-shrinkage thread blank diameter die and a female-shrinkage thread blank diameter die, and extruding the round-head blank into the female-shrinkage thread blank diameter die by the male-shrinkage thread blank diameter die under the action of a vertically downward pressure to obtain a reduced-thread blank diameter blank;

s4, forming double grooves: transferring the reduced thread blank diameter blank to a position between a male forming double-groove die and a female forming double-groove die, and extruding the reduced thread blank diameter blank into the female forming double-groove die by the male forming double-groove die under the action of a vertically downward pressure to obtain a formed double-groove blank;

s5, cutting eccentric disc: and conveying the formed double-groove blank to a position between the positive cutting eccentric die and the negative cutting eccentric die, and extruding the formed double-groove blank into the negative cutting eccentric die by the positive cutting eccentric die under the action of a vertically downward pressure to obtain the eccentric disc blank.

Technical Field

The invention relates to the field of production processes of eccentric adjusting bolts, in particular to a die assembly of an eccentric adjusting bolt and a forming method of the eccentric adjusting bolt.

Background

In the running process of the automobile, parts of all parts can be abraded and deformed to a certain degree due to friction among the parts and vibration generated in running after the automobile is subjected to long-time running, and particularly, the suspension structure of the chassis is the most prominent. Meanwhile, because the automobile runs under various road conditions, the design angles of the four wheels of the automobile when leaving the factory can gradually deviate from the standard values, so that the running performance of the automobile is reduced. In order to return it to a standard angle, it must be positioned four times.

Existing four-wheel positioning is typically accomplished using an adjustment assembly that includes an eccentric bolt, an eccentric washer, and a conventional nut. For the rear wheel, an eccentric bolt is connected with the rear auxiliary frame and one end of a rear suspension connecting rod, the other end of the rear suspension connecting rod is connected with a rear steering knuckle, and a tire is connected to the steering knuckle. The eccentric bolt is adjusted to change the axis position of the eccentric bolt, so that the rear suspension connecting rod is pried to move, and the purpose of adjusting the angle of the tire is achieved.

The general production process of the eccentric bolt in the adjusting assembly comprises the following steps: a protruding structure is formed on a conventional bolt, and then the eccentric flange plate and the bolt are riveted in an interference fit mode to form the eccentric bolt. The process can realize the formation of the eccentric bolt by the cooperation of multiple processes, and simultaneously has the hidden trouble that the eccentric flange plate and the bolt are loosened in the using process. In addition, the guide rail groove of the eccentric gasket on the market is divided into one groove and two grooves, and the guide rail groove is generally formed in a cutting mode. The existing production process can be realized only through a plurality of production procedures in order to realize the eccentric adjustment assembly.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a mold assembly for an eccentric adjusting bolt and a method for forming an eccentric adjusting bolt, which are capable of forming an eccentric flange structure and an eccentric gasket guide rail at one time, reducing the punching and riveting of the eccentric flange, and reducing the cutting of the eccentric gasket guide rail.

Aiming at the problems, the following technical scheme is provided: a die assembly for an eccentric adjusting bolt comprises a male die holder and a female die holder, wherein a male pre-upsetting die, a male upsetting round-head die, a male shrinkage thread blank diameter die, a male forming double-groove die and a male cutting eccentric disc die are sequentially arranged on the male die holder along the progressive direction of a station; a female pre-upsetting die, a female upsetting round head die, a female reducing thread blank diameter die, a female forming double-groove die and a female cutting eccentric disc die are sequentially arranged on the female die holder along the station progressive direction; when the male die base and the female die base are matched in die, the male pre-upsetting die and the female pre-upsetting die are used for pre-upsetting bolt blanks to obtain pre-upsetting blanks, the male upsetting round head die and the female upsetting round head die are used for upsetting round head blanks to obtain round head blanks, the male reducing thread blank diameter die and the female reducing thread blank diameter die are used for reducing the thread blank diameter to the round head blanks to obtain reducing thread blank diameter blanks, the male forming double-groove die and the female forming double-groove die are used for forming double grooves to the reducing thread blank diameter blanks to obtain forming double-groove blanks, and the male cutting eccentric disc die and the female cutting eccentric disc die are used for cutting eccentric discs to the forming double-groove blanks to obtain eccentric disc blanks.

In the structure, the eccentric disc blank is punched in a forging mode, so that the overall structural strength of the eccentric disc blank is more reliable, the subsequent processing cost can be effectively reduced, the compactness among crystal grains of the eccentric disc blank is ensured, the connection strength of the eccentric disc formed in a punching mode can be ensured, the production procedures of the traditional production mode are reduced, and the production process is simplified.

The invention is further arranged in such a way that a plurality of male die external members are sequentially arranged on the male die holder along the progressive direction of the stations, and the male pre-upsetting die, the male upsetting round head die, the male reducing thread billet diameter die, the male forming double-groove die and the male cutting eccentric disc die are respectively arranged in each male die external member in a one-to-one manner and are detachably connected with the male die holder through the male die external members.

In the structure, the disassembly and maintenance of the male pre-upsetting die, the male upsetting round head die, the male reducing thread blank diameter die, the male forming double-groove die and the male cutting eccentric disc die can be facilitated.

The female die is characterized in that a plurality of female die external members are sequentially arranged on the female die holder along the station progressive direction, and the female pre-upsetting die, the female upsetting round head die, the female reducing thread blank diameter die, the female forming double-groove die and the female cutting eccentric disc die are respectively arranged in each female die external member in a one-to-one manner and are detachably connected with the female die holder through the female die external members.

In the structure, the dismounting and maintenance of the female pre-upsetting die, the female upsetting round head die, the female shrinking thread blank diameter die, the female forming double-groove die and the female cutting eccentric disc die can be facilitated.

The invention is further set that the male pre-upsetting die is cylindrical, the female pre-upsetting die is provided with a first through hole, the upper end of the first through hole is provided with a pre-upsetting hole, and the male pre-upsetting die is inserted into the pre-upsetting hole of the female pre-upsetting die to pre-upset the bolt blank during die assembly; the pre-upsetting blank is subjected to upsetting by the aid of the upsetting circular holes, and is subjected to upsetting by the upsetting circular holes; the male-shrinkage threaded blank diameter die is provided with a screw head hole for upsetting a screw head, the female-shrinkage threaded blank diameter die is provided with a third through hole, the upper end of the third through hole is provided with a male-shrinkage threaded hole, and the screw head hole and the male-shrinkage threaded hole are buckled to perform thread-shrinkage blank diameter on a round-head blank during die assembly; the male forming double-groove die is provided with a flange hole for accommodating a screw head, the female forming double-groove die is provided with a fourth through hole, and the male forming double-groove die and the female forming double-groove die are close to each other during die assembly to form double grooves for a reduced thread blank diameter blank; the male cutting eccentric disc die is provided with a cutter part, the female cutting eccentric disc die is provided with a fifth through hole, and the cutter part on the male cutting eccentric disc die abuts against the female cutting eccentric disc die to cut an eccentric disc on the formed double-groove blank when the dies are closed.

In the structure, workpieces on a plurality of stations can be processed in one-time stamping, and the production efficiency is effectively improved.

The invention is further provided that the diameter of the first through hole is 68% -73% of the diameter of the pre-heading hole, and the diameter of the pre-heading hole is larger than the diameter of the bolt blank.

In the above structure, the lower end of the bolt blank can be extruded to form the bolt body.

The invention is further provided that the diameter of the pre-heading hole is 0.1mm larger than the diameter of the bolt blank.

In the structure, the bolt blank can be conveniently put in, and bending is avoided during pre-upsetting.

The invention is further arranged that the diameter of the third through hole is 1.1mm smaller than that of the male-shrinkage threaded hole.

In the structure, the lower end of the bolt body can be further extruded and contracted to improve the strength, and a thread section for processing threads at the later stage is formed.

A molding method of an eccentric adjusting bolt comprises the following steps:

s1, pre-upsetting: transferring a bolt blank between a male pre-upsetting die and a female pre-upsetting die, and extruding the blank piece into the female pre-upsetting die by the male pre-upsetting die under a vertically downward pressure to obtain a pre-upsetting blank;

s2, upsetting a round head: conveying the pre-upset blank between a male upsetting round head die and a female upsetting round head die, and extruding the pre-upset blank into the female upsetting round head die by the male upsetting round head die under a vertically downward pressure to obtain a round head blank;

s3, reducing the diameter of the thread blank: transferring the round-head blank between a male-shrinkage thread blank diameter die and a female-shrinkage thread blank diameter die, and extruding the round-head blank into the female-shrinkage thread blank diameter die by the male-shrinkage thread blank diameter die under the action of a vertically downward pressure to obtain a reduced-thread blank diameter blank;

s4, forming double grooves: transferring the reduced thread blank diameter blank to a position between a male forming double-groove die and a female forming double-groove die, and extruding the reduced thread blank diameter blank into the female forming double-groove die by the male forming double-groove die under the action of a vertically downward pressure to obtain a formed double-groove blank;

s5, cutting eccentric disc: and conveying the formed double-groove blank to a position between the positive cutting eccentric die and the negative cutting eccentric die, and extruding the formed double-groove blank into the negative cutting eccentric die by the positive cutting eccentric die under the action of a vertically downward pressure to obtain the eccentric disc blank.

The invention has the beneficial effects that: the eccentric disc blank is punched in a forging mode, so that the overall structural strength of the eccentric disc blank is more reliable, the subsequent processing cost can be effectively reduced, the compactness of crystal grains of the eccentric disc blank can be ensured, the connection strength of the eccentric disc formed in the punching mode can be ensured, the production procedures of the traditional production mode can be reduced, and the production process can be simplified; the flange plate forming process and the corresponding cost are reduced, and the double-groove cutting process and the corresponding cost are reduced; the riveting process of the flange and the bolt and the corresponding cost are reduced; the cost waste and the quality risk caused by the falling of the bolt and the flange plate are avoided; the quality stability of the eccentric assembly is improved, the production procedures are reduced, and the cost is reduced.

Drawings

FIG. 1 is a schematic overall sectional structure of the present invention.

FIG. 2 is an enlarged view of the portion A of FIG. 1 according to the present invention.

FIG. 3 is an enlarged view of the portion B of FIG. 1 according to the present invention.

FIG. 4 is an enlarged view of the portion C of FIG. 1 according to the present invention.

FIG. 5 is an enlarged view of the portion D of FIG. 1 according to the present invention.

FIG. 6 is an enlarged view of section E of FIG. 1 according to the present invention.

Fig. 7 is a schematic structural view of the bolt blank of the present invention.

Fig. 8 is a schematic view of the structure of a pre-upset blank of the invention.

Fig. 9 is a schematic view of a round head blank configuration of the present invention.

FIG. 10 is a schematic view of the blank diameter reducing blank construction of the present invention.

Fig. 11 is a schematic view of the construction of a double flute blank of the present invention.

FIG. 12 is a schematic view of the construction of the eccentric blank of the present invention.

The reference numbers in the figures mean: 10-male die holder; 11-positive pre-upsetting die; 12-male heading round head die; 121-male upset round holes; 13-a male-shrinkage thread blank diameter die; 131-a screw head hole; 14-positive forming double-groove die; 141-flange holes; 15-positive cutting eccentric disc mold; 151-cutter portion; 16-a male die set; 20-female die holder; 21-female pre-upsetting die; 211 — a first via; 212-pre-heading hole; 22-female heading round head die; 221-a second via; 222-female upset round hole; 23-reducing the diameter of the thread blank; 231-third via holes; 232-male screw hole; 24-female forming double-groove die; 241-a fourth via; 25-negative cutting eccentric disc mold; 251-a fifth via; a-a bolt blank; b-pre-upsetting the blank; c-a round head blank; d-reducing the diameter of the thread blank; e-a double flute blank; f-eccentric blank; g-eccentric disc; h-screw head; i-a bolt body; j-thread segment.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Referring to fig. 1 to 12, the die assembly for eccentric adjusting bolt shown in fig. 1 to 12 includes a male die holder 10 and a female die holder 20, wherein a male pre-heading die 11, a male heading round-head die 12, a male reducing thread blank diameter die 13, a male forming double-groove die 14 and a male cutting eccentric disc die 15 are sequentially arranged on the male die holder 10 along a station progressive direction; the female die holder 20 is sequentially provided with a female pre-upsetting die 21, a female upsetting round-head die 22, a female shrinking thread blank diameter die 23, a female forming double-groove die 24 and a female cutting eccentric disc die 25 along the station progressive direction; during the compound die of positive die holder 10 and bed die seat 20, positive is upset mould 11 and negative is upset mould 21 in advance to bolt blank a in advance and is obtained pre-heading blank b in advance, positive is upset button head mould 12 and negative is upset button head mould 22 and is upset the button head to pre-heading blank b and obtain button head blank c, positive is contracted screw thread blank footpath mould 13 and is contracted screw thread blank footpath mould 23 and obtain contracted screw thread blank footpath blank d to button head blank c, positive shaping double flute mould 14 and negative shaping double flute mould 24 carry out the shaping double flute to contracting screw thread blank footpath blank d and obtain shaping double flute blank e, positive is cut eccentric disc mould 15 and negative and is cut the disc mould 25 and cut the eccentric disc to shaping double flute blank eccentric disc blank e and obtain eccentric disc blank f.

In the structure, the eccentric disc blank f is punched in a forging mode, so that the overall structural strength of the eccentric disc blank f is more reliable, the subsequent processing cost can be effectively reduced, the compactness among crystal grains of the eccentric disc blank f is ensured, the connection strength of the eccentric disc g formed in a punching mode can be ensured, the production procedures of the traditional production mode are reduced, and the production process is simplified.

In this embodiment, a plurality of male die external members 16 are sequentially arranged on the male die holder 10 along the station progressive direction, and the male pre-upsetting die 11, the male upsetting round-head die 12, the male reducing thread blank diameter die 13, the male forming double-groove die 14 and the male cutting eccentric disc die 15 are respectively arranged in each male die external member 16 one-to-one, and are detachably connected with the male die holder 10 through the male die external members 16.

In the structure, the disassembly and maintenance of the male pre-upsetting die 11, the male upsetting round-head die 12, the male shrinkage thread blank diameter die 13, the male forming double-groove die 14 and the male cutting eccentric disc die 15 can be facilitated.

In this embodiment, a plurality of female die external members 26 are sequentially arranged on the female die holder 20 along the station progressive direction, and the female pre-upsetting die 21, the female upsetting round-head die 22, the female reducing thread blank diameter die 23, the female forming double-groove die 24 and the female cutting eccentric disc die 25 are respectively arranged in each female die external member 26 one-to-one, and are detachably connected with the female die holder 20 through the female die external members 26.

In the above structure, the dismounting and maintenance of the female pre-upsetting die 21, the female upsetting round head die 22, the female reducing thread blank diameter die 23, the female forming double-groove die 24 and the female cutting eccentric disc die 25 can be facilitated.

In this embodiment, the male pre-upsetting die 11 is cylindrical, the female pre-upsetting die 21 is provided with a first through hole 211, the upper end of the first through hole 211 is provided with a pre-upsetting hole 212, and the male pre-upsetting die 11 is inserted into the pre-upsetting hole 212 of the female pre-upsetting die 21 to pre-upset the bolt blank a during die assembly; the male upsetting round head die 12 is provided with a male upsetting round hole 121, the female upsetting round head die 22 is provided with a second through hole 221, the upper end of the second through hole 221 is provided with a female upsetting round hole 222, and the male upsetting round hole 121 and the female upsetting round hole 222 are buckled to upset a pre-upsetting blank b during die assembly; the male-shrinkage threaded billet diameter die 13 is provided with a screw head hole 131 for upsetting a screw head h, the female-shrinkage threaded billet diameter die 23 is provided with a third through hole 231, the upper end of the third through hole 231 is provided with a male-shrinkage threaded hole 232, and the screw head hole 131 and the male-shrinkage threaded hole 232 are buckled to perform the diameter shrinkage of the round-head billet c during die assembly; the male forming double-groove die 14 is provided with a flange hole 141 for accommodating a screw head h, the female forming double-groove die 24 is provided with a fourth through hole 241, and the male forming double-groove die 14 and the female forming double-groove die 24 approach each other during die assembly to form a double groove for a reduced thread blank diameter blank d; the male cutting eccentric disc die 15 is provided with a cutter portion 151, the female cutting eccentric disc die 25 is provided with a fifth through hole 251, and the cutter portion 151 on the male cutting eccentric disc die 15 is abutted against the female cutting eccentric disc die 25 during die assembly to cut an eccentric disc of a formed double-groove blank e.

In the structure, workpieces on a plurality of stations can be processed in one-time stamping, and the production efficiency is effectively improved.

In the embodiment, the diameter of the first through hole 211 is 68-73% of the diameter of the pre-upset hole 212, and the diameter of the pre-upset hole 212 is larger than the diameter of the bolt blank a.

In the above configuration, the lower end of the bolt material a is extruded to form the bolt body i.

In the embodiment, the diameter of the pre-heading hole 212 is 0.1mm larger than that of the bolt blank a.

In the structure, the bolt blank a can be conveniently put in, and bending is avoided during pre-upsetting.

In this embodiment, the diameter of the third through hole 231 is 1.1mm smaller than that of the male threaded hole 232.

In the structure, the lower end of the bolt body i can be further extruded and contracted to improve the strength, and a thread section j used for processing threads at the later stage is formed.

A molding method of an eccentric adjusting bolt comprises the following steps:

s1, pre-upsetting: transferring a bolt blank a between a male pre-upsetting die 11 and a female pre-upsetting die 21, and extruding the blank piece into the female pre-upsetting die 21 by the male pre-upsetting die 11 under a vertically downward pressure to obtain a pre-upsetting blank b;

s2, upsetting a round head: conveying the pre-upset blank b between the male upsetting round head die 12 and the female upsetting round head die 22, and extruding the pre-upset blank b into the female upsetting round head die 22 by the male upsetting round head die 12 under a vertically downward pressure to obtain a round head blank c;

s3, reducing the diameter of the thread blank: transferring the round-head blank c between a male-shrinkage thread blank diameter die 13 and a female-shrinkage thread blank diameter die 23, and extruding the round-head blank c into the female-shrinkage thread blank diameter die 23 by the male-shrinkage thread blank diameter die 13 under a vertically downward pressure to obtain a reduced-thread blank diameter blank d;

s4, forming double grooves: transferring the reduced thread blank diameter blank d between a male forming double-groove die 14 and a female forming double-groove die 24, and extruding the reduced thread blank diameter blank d into the female forming double-groove die 24 by the male forming double-groove die 14 under a vertically downward pressure to obtain a formed double-groove blank e;

s5, cutting eccentric disc: the formed double-groove blank e is conveyed to a position between the positive cutting eccentric die 15 and the negative cutting eccentric die 25, and the positive cutting eccentric die 15 is pressed into the negative cutting eccentric die 25 by a vertical downward pressure, so that an eccentric disc blank f is obtained.

The invention has the beneficial effects that: the eccentric disc blank f is punched in a forging mode, so that the overall structural strength of the eccentric disc blank f is more reliable, the subsequent processing cost can be effectively reduced, the compactness of crystal grains of the eccentric disc blank f can be ensured, the connection strength of the eccentric disc g formed in the punching mode can be ensured, the production procedures of the traditional production mode can be reduced, and the production process can be simplified; the flange plate forming process and the corresponding cost are reduced, and the double-groove cutting process and the corresponding cost are reduced; the riveting process of the flange and the bolt and the corresponding cost are reduced; the cost waste and the quality risk caused by the falling of the bolt and the flange plate are avoided; the quality stability of the eccentric assembly is improved, the production procedures are reduced, and the cost is reduced.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and those modifications and variations assumed in the above are also considered to be within the protective scope of the present invention.