CN212945208U

CN212945208U - Forming die group of flange special-shaped hole bushing

Info

Publication number: CN212945208U
Application number: CN202020335633.9U
Authority: CN
Inventors: 罗从启; 江建生; 邵鹏; 刘赏; 王敦俊
Original assignee: Kunshan Maxpower Precision Machinery Co ltd
Current assignee: Kunshan Maxpower Precision Machinery Co ltd
Priority date: 2020-03-17
Filing date: 2020-03-17
Publication date: 2021-04-13
Anticipated expiration: 2030-03-17

Abstract

The utility model discloses a forming die set of a flange special-shaped hole bushing, which comprises a shaping die, a primary round hole pre-forming die, a secondary round hole pre-forming die, a flange forming die, a cylindrical hole forming die, a special-shaped hole and a square hole forming die, wherein the shaping die is used for cold heading and extruding a blank to obtain a cylindrical blank; the primary round hole preforming die punches a first positioning center blind hole from one side of a cylindrical blank, the secondary round hole preforming die punches a second center blind hole from the other side of the cylindrical blank, the flange forming die carries out upsetting processing on the blank to enable the middle of the blank to form a flange portion, the cylindrical hole forming die carries out punching processing on the blank to enable the blind holes on two sides of the blank to be communicated, and the special-shaped hole and the square hole forming die punch the flange portion to obtain a finished product. The utility model discloses a processing steps such as punching press flange, special-shaped hole are punched a hole are realized respectively to the mould of a plurality of stations in the mould group, improve raw and other materials utilization ratio, improve the finished product quality.

Description

Forming die group of flange special-shaped hole bushing

Technical Field

The utility model relates to a stamping forming mould, concretely relates to forming die group of flange dysmorphism hole bush.

Background

In the moving parts, parts are worn due to long-term friction, and the parts must be replaced when the clearance between the shaft and the hole is worn to a certain degree, so a designer selects a material with lower hardness and better wear resistance as the bushing at the design time, so that the wear of the shaft and the seat can be reduced, and the bushing is replaced when the wear is worn to a certain degree.

Because the most of current axle and hole are the nonstandard component of producing according to the user demand of difference, so require its bush also to be nonstandard structure, the bush that has the flange and set up different types of holes on the flange need be made to the current nonstandard flange dysmorphism hole bush, and current preparation flow is: customizing a bar or a pipe with a diameter larger than that of the flange → machining a cylindrical inner hole and a cylindrical rod diameter → machining the cylindrical rod diameter → blanking or machining a special-shaped through hole → blanking or machining a square opening, and the existing manufacturing process has certain defects:

1. the production cost is high: too large machining allowance, low material utilization rate, long machining time,

2. the processing efficiency is low: the working procedures are more, the machining allowance is too large, the machining working procedures are more, the machining is not consistent, and the machining speed is 10-15 pieces/hour.

3. The product percent of pass is low: 4 special-shaped through holes and square open holes have position degree requirements, and position deviation is easy to generate by multiple times of clamping, so that bad production is caused.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide a forming die group of flange dysmorphism hole bush, the mould through a plurality of stations in the die group realizes processing steps such as punching press flange, dysmorphism hole punching a hole respectively, improves raw and other materials utilization ratio, improves finished product quality.

In order to solve the technical problem, the utility model provides a forming die set of a flange special-shaped hole bushing, which comprises a shaping die, a primary round hole preforming die, a secondary round hole preforming die, a flange forming die, a cylindrical hole forming die, a special-shaped hole and a square hole forming die, wherein the shaping die is used for performing cold heading extrusion on a blank to obtain a cylindrical blank; the primary circular hole preforming die punches a first positioning central blind hole from one side of a cylindrical blank, the secondary circular hole preforming die punches a second central blind hole concentric with the first positioning central blind hole from the other side of the cylindrical blank, the flange forming die performs upsetting treatment on the blank to enable the middle of the blank to form a flange portion, the cylindrical hole forming die performs punching processing on the blank to enable the first positioning central blind hole and the second positioning central blind hole on the two sides of the blank to be communicated, and the special-shaped hole and square hole forming die performs punching processing on the flange portion to obtain a finished product with special-shaped holes and square holes.

The utility model discloses a preferred embodiment, further include the plastic mould includes first towards mould shell and first cover half, be provided with first front punch backing bar, first preceding towards stick in the first die shell, first preceding towards stick withstands first front punch backing bar, first preceding towards stick passes first towards mould shell, be provided with first back punch backing bar, first back towards stick in the first cover half, first back towards stick withstands first back punch backing bar, first back towards stick passes first cover half, first preceding towards stick and first back towards stick cooperation are extruded into cylindric blank.

In a preferred embodiment of the present invention, the die further comprises a first hole preforming die including a second die stamping shell and a second fixed die, a second front punch pad bar and a second front punch bar are arranged in the second die shell, the second front punch bar is pressed against the second front punch pad bar, the second front punching rod penetrates through the second punching die shell, a second rear punching pin, a second rear material pushing pipe and a second rear material pushing thimble are arranged in the second fixed die, the second rear punching rod props against a second rear punch pad bar and passes through a second fixed die, the second rear pushing sleeve is sleeved outside the second rear punching rod, the second rear pushing thimble penetrates through the second fixed die to be propped against the second rear pushing pipe, the second rear pushing pipe is abutted to the periphery of the cylindrical blank, and the second rear punching rod punches the first positioning center blind hole from one side of the cylindrical blank.

The utility model discloses a preferred embodiment, further include the secondary round hole preforming mould, including third towards mould shell and third cover half, be provided with third front punch backing bar, third front punch stick, third front material pushing pipe, third front material pushing thimble in the third punch shell, third front punch stick withstands third front punch backing bar, third front punch stick passes through the third towards mould shell, third front material pushing pipe box sets up in the third front punch stick outside, third back material pushing thimble runs through the third cover half and withstands on the third front material pushing pipe, third front material pushing pipe withstands in the cylindric blank periphery, third front punch stick from a side impact second location center blind hole of cylindric blank; the third fixed die is internally provided with a third rear punch pad rod, a third rear punch rod, a third rear material pushing pipe and a third rear material pushing thimble, the third rear punch rod props against the third rear punch pad rod, the third rear punch rod penetrates through the third fixed die, the third rear material pushing pipe is sleeved outside the third rear punch rod, the third rear material pushing thimble penetrates through the third fixed die and props against the third rear material pushing pipe, the third rear material pushing pipe props against the periphery of the cylindrical blank, and the third rear punch rod is inserted into the first center blind hole to fix the blank.

The utility model discloses a preferred embodiment, further include the flange forming die includes fourth towards mould shell and fourth cover half, be provided with fourth front punch backing bar, fourth front towards stick, fourth front push away material pipe, fourth front push away material thimble in the fourth die shell, fourth front towards stick withstands fourth front punch backing bar, fourth front towards stick passes fourth towards mould shell, fourth front pushes away the material pipe and establishes in the fourth front towards stick outside, fourth back pushes away the material thimble and runs through the fourth cover half and pushes away on the fourth front push away material pipe, fourth front pushes away the material pipe and pushes up in cylindric blank periphery, fourth front towards stick inserts in second location center blind hole and fixes the embryo; the fourth die is internally provided with a fourth rear punch pad rod, a fourth rear punch rod, a fourth rear material pushing pipe and a fourth rear material pushing thimble, the fourth rear punch rod props against the fourth rear punch pad rod, the fourth rear punch rod penetrates through the fourth die, the fourth rear material pushing pipe is sleeved outside the fourth rear punch rod, the fourth rear material pushing thimble penetrates through the fourth die and props against the fourth rear material pushing pipe, the fourth rear material pushing pipe props against the periphery of the cylindrical blank, the fourth rear punch rod is inserted into the first center blind hole to fix the blank, and the fourth die shell applies pressure downwards to enable the fourth die shell and the fourth die to form a flange part.

In a preferred embodiment of the present invention, the cylindrical hole forming die further includes a fifth punching die shell and a fifth fixed die, a fifth front punch pad bar and a fifth front punch bar are disposed in the fifth punching die shell, the fifth front punch bar abuts against the fifth front punch pad bar, and the fifth front punch bar passes through the fifth punching die shell; the punching die is characterized in that a fifth rear punch pad rod, a fifth rear punch rod, a fifth rear pushing pipe and a fifth rear pushing thimble are arranged in the fifth fixed die, the fifth rear punch rod abuts against the fifth rear punch pad rod, the fifth rear punch rod penetrates through the fifth fixed die, the fifth rear pushing pipe is sleeved outside the fifth rear punch rod, the fifth rear pushing thimble penetrates through the fifth fixed die and abuts against the fifth rear pushing pipe, the fifth rear pushing pipe abuts against the periphery of the cylindrical blank, the fifth rear punch rod is inserted into the first center blind hole and conducts punching processing on the blank, and therefore the first positioning center blind holes and the second positioning center blind holes on two sides of the blank are communicated.

The utility model discloses a preferred embodiment, further include the dysmorphism hole and square hole forming die include sixth punching die shell and sixth cover half, be provided with sixth front punch backing bar, sixth front punch stick, quad slit punch stick, dysmorphism hole punch stick in the sixth punching die shell, sixth front punch stick withstands sixth front punch backing bar, sixth front punch stick passes sixth punching die shell, quad slit punch stick one side withstands sixth front punch backing bar, and the opposite side punches square hole on the ring flange, dysmorphism hole punch stick one side withstands sixth front punch backing bar, and the opposite side punches the dysmorphism hole on the ring flange; and a material pushing punch rod is arranged in the sixth fixed die and is respectively propped against the lower part of the blank, the lower part of the square hole punch rod and the lower part of the special-shaped hole punch rod.

The utility model discloses a preferred embodiment, further include plastic mould, first round hole forming die, second round hole forming die, flange forming die, cylinder hole forming die, dysmorphism hole and square hole forming die all set up and use on multistation cold-heading screw machine equipment.

The utility model has the advantages that:

the utility model discloses a method of cold-heading, the cold-heading mould cooperation through the multistation, with the former blank progressively punching press cold-heading shaping, for prior art's machining production technology, cold-heading technology produces few leftover bits, improves material utilization to can realize from former material to off-the-shelf processing at different stations on a cold-heading machine, improve production efficiency, and the utility model discloses a stamping forming of quad slit and abnormal shape hole need not secondary clamp and adorns, size precision when can guaranteeing big batch production.

Drawings

Fig. 1 is a schematic structural view of the whole forming die set of the flange special-shaped hole bushing of the present invention;

FIG. 2 is a front and side view of the finished part of the flanged special hole bushing of the present invention;

fig. 3 is a schematic structural view of the shaping mold of the present invention;

FIG. 4 is a schematic structural view of a primary round hole preforming mold according to the present invention;

FIG. 5 is a schematic structural view of the secondary round hole preforming mold of the present invention

FIG. 6 is a schematic structural view of the flange forming mold of the present invention

FIG. 7 is a schematic structural view of the cylindrical hole forming mold of the present invention

Fig. 8 is a schematic structural view of the special-shaped hole and square hole forming die of the present invention.

The reference numbers in the figures illustrate: 1. a blank; 2. shaping the die; 201. a first die shell; 202. a first stationary mold; 203. a first front punch backing bar; 204. a first front punch bar; 205. a first rear punch backing bar; 206. a first back punch bar; 3. a primary round hole preforming die; 301. a second die shell; 302. a second stationary mold; 303. a second front punch backing bar; 304. a second front punch bar; 305. a second rear punch backing bar; 306. a second back punch bar; 307. A second rear material pushing pipe; 308. a second rear pushing thimble; 4. performing a secondary round hole preforming die; 401. a third die shell punching; 402. a third fixed die; 403. a third front punch backing bar; 404. a third front punch bar; 405. a third front material pushing pipe; 406. a third front pushing thimble; 407. a third rear punch backing bar; 408. a third back punch bar; 409. pushing the material pipe after the third step; 410. thirdly, pushing a thimble; 5. a flange forming die; 501. a fourth die shell; 502. a fourth fixed die; 503. a fourth front punch backing bar; 504. a fourth front punch bar; 505. a fourth front material pushing pipe; 506. a fourth front pushing thimble; 507. a fourth rear punch backing bar; 508. a fourth back punch bar; 509. fourth, pushing the material pipe; 510. fourthly, pushing a thimble; 6. a cylindrical hole forming die; 601. a fifth punching mould shell; 602. a fifth fixed die; 603. a fifth front punch backing bar; 604. a fifth front punch bar; 605. a fifth rear punch backing bar; 606. a fifth back punch bar; 607. fifthly, pushing a material pipe; 608. fifthly, pushing a thimble; 7. a special-shaped hole and a square hole forming die; 701. a fifth punching mould shell; 702. a fifth fixed die; 703. a fifth front punch backing bar; 704. a fifth front punch bar; 705. punching a rod in a square hole; 706. punching a special-shaped hole; 707. pushing a material and punching a rod; 8. finished products; 801. a flange plate; 802. a square hole; 803. and (4) a special-shaped hole.

Detailed Description

The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.

Referring to fig. 1-2, an embodiment of a forming die set for a flange special-shaped hole bushing according to the present invention includes a shaping die 2, a primary circular hole preforming die 3, a secondary circular hole preforming die 4, a flange forming die 5, a cylindrical hole forming die 6, a special-shaped hole and a square hole forming die 7, wherein the shaping die 2 performs cold heading extrusion on a blank 1 to obtain a cylindrical blank 1; the primary round hole preforming die 3 punches a first positioning central blind hole from one side of a cylindrical blank 1, the secondary round hole preforming die 4 punches a second central blind hole concentric with the first positioning central blind hole from the other side of the cylindrical blank 1, the flange forming die 5 performs upsetting treatment on the blank 1 to form a flange part in the middle of the blank 1, the cylindrical hole forming die 6 performs perforating processing on the blank 1 to enable the first positioning central blind hole and the second positioning central blind hole on the two sides of the blank 1 to be communicated, the special-shaped hole and square hole forming die 7 performs punching treatment on the flange part to obtain a finished product 8 with a special-shaped hole 803 and a square hole, the shaping die 2 extrudes the original blank 1 into a cylinder with a regular shape to facilitate the forming of other subsequent dies, the primary round hole preforming die 3 performs partial cylindrical blind holes on one side of the cylindrical blank 1, reducing the stress of subsequent punching, punching a second central blind hole concentric with the first positioning central blind hole from the other side of the cylindrical blank 1 by the secondary circular hole preforming die 4, inserting a punching rod into the first positioning central blind hole to position the blank 1, ensuring that the first positioning central blind hole and the second central blind hole are concentrically arranged, continuously applying downward force to carry out upsetting treatment on the flange forming die 5 on the basis of the secondary circular hole preforming die 4 to enable the first positioning central blind hole and the second positioning central blind hole in the middle of the blank 1 to form a flange plate 801, removing redundant waste materials in the cylindrical hole of the blank 1 by adopting the cylindrical hole forming die 6 to enable the cylindrical hole to be formed in place, finally simultaneously punching a square hole 802 and four special holes 803 on the flange plate 801 by using a special-shaped hole and four-square hole forming die 7, and gradually punching and cold-heading the original blank 1 by matching of the multi-station cold-heading die, for prior art's machining production technology, cold-heading technology produces few leftover bits, improves material utilization to can realize from former material to off-the-shelf processing at different stations on a cold heading machine, improve production efficiency, and the utility model discloses a punch forming of quad slit 802 and abnormal shape hole 803 need not the secondary and presss from both sides the dress, size precision when can guaranteeing mass production.

Referring to fig. 3, the shaping mold 2 includes a first mold punching shell 201 and a first fixed mold 202, a first front punch pad 203 and a first front punch bar 204 are arranged in the first mold punching shell 201, the first front punch bar 204 abuts against the first front punch pad 203, the first front punch bar 204 penetrates through the first mold punching shell 201, a first rear punch pad 205 and a first rear punch bar 206 are arranged in the first fixed mold 202, the first rear punch bar 206 abuts against the first rear punch pad 205, the first rear punch bar 206 penetrates through the first fixed mold 202, the first front punch bar 204 and the first rear punch bar 206 cooperate to extrude the blank 1 into the blank 1, and the shaping mold 2 extrudes the original blank 1 into a cylinder with a regular shape, which is beneficial for shaping of other subsequent molds.

Referring to fig. 4, the primary circular hole preforming mold 3 includes a second punching mold shell 301 and a second fixed mold 302, a second front punch pad bar 303 and a second front punch bar 304 are disposed in the second punching mold shell 301, the second front punch bar 304 abuts against the second front punch pad bar 303, the second front punch bar 304 passes through the second punching mold shell 301, a second rear punch pad bar 305, a second rear punch bar 306, a second rear push pipe 307 and a second rear push pin 308 are disposed in the second fixed mold 302, the second rear punch bar 306 abuts against the second rear punch pad bar 305, the second rear punch bar 306 passes through the second punching mold shell 302, the second rear push pipe 307 is sleeved outside the second rear punch bar 306, the second rear push pin 308 penetrates through the second fixed mold 302 and abuts against the second rear push pipe 307, the second rear push pipe 307 abuts against the periphery of the cylindrical blank 1, and the second rear punch bar 306 pushes a first fixed position blind hole from one side of the cylindrical blank 1, after the first positioning center blind hole is punched, the blank 1 can be quickly ejected out of the second fixed die 302 by using the second rear pushing ejector pin 308.

Referring to fig. 5, the secondary circular hole preforming mold 4 includes a third punching mold shell 401 and a third fixed mold 402, a third front punching pad bar 403, a third front punching rod 404, a third front material pushing pipe 405 and a third front material pushing thimble 406 are disposed in the third punching mold shell 401, the third front punching rod 404 props against the third front punching pad bar 403, the third front punching rod 404 penetrates through the third punching mold shell 401, the third front material pushing pipe 405 is sleeved outside the third front punching rod 404, the third rear material pushing thimble 410 penetrates through the third fixed mold 402 and props against the third front material pushing pipe 405, the third front material pushing pipe 405 props against the periphery of the cylindrical blank 1, and the third front punching rod 404 punches a second positioning center blind hole from one side of the cylindrical blank 1; a third rear punch pad bar 407, a third rear punch bar 408, a third rear push pipe 409 and a third rear push thimble 410 are arranged in the third fixed die 402, the third rear punch bar 408 abuts against the third rear punch pad bar 407, the third rear punch bar 408 passes through the third fixed die 402, the third rear push pipe 409 is sleeved outside the third rear punch bar 408, the third rear push thimble 410 passes through the third fixed die 402 and abuts against the third rear push pipe 409, the third rear push pipe 409 abuts against the periphery of the cylindrical blank 1, the third rear punch bar 408 is inserted into the first central blind hole to fix the blank, after the second positioning central blind hole is punched, the blank 1 can be quickly ejected out from the third fixed die 402 by using the third rear push thimble 410, the utility model adopts a mode of pre-punching central blind holes on two sides, reduces the stress of subsequent punching, and positions the blank 1 by inserting the punch bar into the first positioning central hole, the first positioning center blind hole and the second positioning center blind hole are arranged concentrically.

Referring to fig. 6, the flange forming die 5 includes a fourth die casing 501 and a fourth fixed die 502, a fourth front punch pad 503, a fourth front punch rod 504, a fourth front material pushing tube 505 and a fourth front material pushing thimble 506 are disposed in the fourth die casing 501, the fourth front punch rod 504 props against the fourth front punch pad 503, the fourth front punch rod 504 penetrates through the fourth die casing 501, the fourth front material pushing tube 505 is sleeved outside the fourth front punch rod 504, the fourth rear material pushing thimble 510 penetrates through the fourth fixed die 502 and props against the fourth front material pushing tube 505, the fourth front material pushing tube 505 props against the outer periphery of the cylindrical blank 1, and the fourth front punch rod 504 is inserted into a second positioning center blind hole to fix the blank; a fourth rear punch pad rod 507, a fourth rear punch rod 508, a fourth rear push pipe 509 and a fourth rear push thimble 510 are arranged in the fourth fixed die 502, the fourth rear punch bar 508 abuts against the fourth rear punch pad 507, the fourth rear punch bar 508 passes through the fourth fixed die 502, the fourth rear material pushing pipe 509 is sleeved outside the fourth rear punch 508, the fourth rear material pushing thimble 510 penetrates through the fourth fixed die 502 and pushes against the fourth rear material pushing pipe 509, the fourth rear pushing pipe 509 is pushed against the periphery of the cylindrical blank 1, the fourth rear punching rod 508 is inserted into the first central blind hole to fix the blank, the fourth punching mold shell 501 applies downward pressure to form a flange part between the fourth punching mold shell 501 and the fourth fixed mold 502, after the stamping is completed, the fourth front pushing thimble 506 and the fourth rear pushing thimble 510 push the blank 1 out of the fourth stamping shell 501 and the fourth fixed die 502, respectively.

Referring to fig. 7, the cylindrical hole forming die 6 includes a fifth punching die shell 601 and a fifth fixed die 602, a fifth front punching pad 603 and a fifth front punching rod 604 are disposed in the fifth punching die shell 601, the fifth front punching rod 604 abuts against the fifth front punching pad 603, and the fifth front punching rod 604 penetrates through the fifth punching die shell 601; a fifth rear punch pad rod 605, a fifth rear punch rod 606, a fifth rear pushing tube 607 and a fifth rear pushing thimble 608 are arranged in the fifth fixed die 602, the fifth rear punch rod 606 abuts against the fifth rear punch pad rod 605, the fifth rear punch rod 606 penetrates through the fifth fixed die 602, the fifth rear pushing tube 607 is sleeved outside the fifth rear punch rod 606, the fifth rear pushing thimble 608 penetrates through the fifth fixed die 602 and abuts against the fifth rear pushing tube 607, the fifth rear pushing tube 607 abuts against the periphery of the cylindrical blank 1, the fifth rear punch rod 606 is inserted into the first center blind hole to punch the blank 1, so that the first positioning center blind hole and the second positioning center blind hole on both sides of the blank 1 are communicated, and after punching is completed, the fifth rear pushing thimble 608 takes out the blank 1 from the fifth fixed die 602.

Referring to fig. 8, the special-shaped hole and square hole forming die 7 includes a sixth punching die shell 701 and a sixth fixed die 702, a sixth front punch pad 703, a sixth front punch rod 704, a square hole punch rod 705 and a special-shaped hole punch rod 706 are arranged in the sixth punching die shell 701, the sixth front punch rod 704 abuts against the sixth front punch pad 703, the sixth front punch rod 704 penetrates through the sixth punching die shell 701, one side of the square hole punch rod 705 abuts against the sixth front punch pad 703, the other side of the square hole punch rod 705 punches a square hole 802 on the flange plate 801, one side of the special-shaped hole punch rod 706 abuts against the sixth front punch pad 703, and the other side of the special-shaped hole 803 is punched on the flange plate 801; a material pushing punch 707 is arranged in the sixth fixed die 702, the material pushing punch 707 is respectively pushed below the blank 1, the square hole punch 705 and the special-shaped hole punch 706, the blank 1 is ejected from the sixth fixed die 702 by the material pushing punch 707, and simultaneously the punched waste is ejected from the square hole 802 and the special-shaped hole.

Specifically, the shaping mold 2, the primary round hole preforming mold 3, the secondary round hole preforming mold 4, the flange forming mold 5, the cylindrical hole forming mold 6, the special-shaped hole and the square hole forming mold 7 are all arranged on the multi-station cold heading screw machine for use.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.

Claims

1. A forming die set for a flange special-shaped hole bushing is characterized by comprising a shaping die, a primary round hole preforming die, a secondary round hole preforming die, a flange forming die, a cylindrical hole forming die, a special-shaped hole and a square hole forming die, wherein the shaping die is used for performing cold heading extrusion on a blank to obtain a cylindrical blank; the primary circular hole preforming die punches a first positioning central blind hole from one side of a cylindrical blank, the secondary circular hole preforming die punches a second central blind hole concentric with the first positioning central blind hole from the other side of the cylindrical blank, the flange forming die performs upsetting treatment on the blank to enable the middle of the blank to form a flange portion, the cylindrical hole forming die performs punching processing on the blank to enable the first positioning central blind hole and the second positioning central blind hole on the two sides of the blank to be communicated, and the special-shaped hole and square hole forming die performs punching processing on the flange portion to obtain a finished product with special-shaped holes and square holes.

2. The die set for forming a flanged special-shaped hole bushing according to claim 1, wherein the shaping die comprises a first die shell and a first fixed die, a first front punch backing rod and a first front punch rod are arranged in the first die shell, the first front punch rod abuts against the first front punch backing rod, the first front punch rod penetrates through the first die shell, a first rear punch backing rod and a first rear punch rod are arranged in the first fixed die, the first rear punch rod abuts against the first rear punch backing rod, the first rear punch rod penetrates through the first fixed die, and the first front punch rod and the first rear punch rod cooperate to extrude the blank into a cylindrical blank.

3. The forming die set for a flanged profiled bore bushing of claim 1, the primary round hole preforming die comprises a second die stamping shell and a second fixed die, a second front punch pad rod and a second front punch rod are arranged in the second die stamping shell, the second front punching rod props against a second front punching head cushion rod, the second front punching rod penetrates through a second punching mould shell, a second rear punch pad rod, a second rear punch rod, a second rear material pushing pipe and a second rear material pushing thimble are arranged in the second fixed die, the second rear punching rod props against a second rear punch pad bar and passes through a second fixed die, the second rear pushing sleeve is sleeved outside the second rear punching rod, the second rear pushing thimble penetrates through the second fixed die to be propped against the second rear pushing pipe, the second rear pushing pipe is abutted to the periphery of the cylindrical blank, and the second rear punching rod punches the first positioning center blind hole from one side of the cylindrical blank.

4. The forming die set for the special-shaped hole bush of the flange according to claim 1, wherein the secondary circular hole preforming die comprises a third die shell and a third fixed die, a third front punch backing bar, a third front punch bar, a third front material pushing pipe and a third front material pushing thimble are arranged in the third die shell, the third front punch bar abuts against the third front punch backing bar, the third front punch bar penetrates through the third die shell, the third front material pushing pipe is sleeved outside the third front punch bar, the third front material pushing thimble penetrates through the third fixed die and abuts against the third front material pushing pipe, the third front material pushing pipe abuts against the periphery of the cylindrical blank, and the third front punch bar punches a second positioning center blind hole from one side of the cylindrical blank; the third fixed die is internally provided with a third rear punch pad rod, a third rear punch rod, a third rear material pushing pipe and a third rear material pushing thimble, the third rear punch rod props against the third rear punch pad rod, the third rear punch rod penetrates through the third fixed die, the third rear material pushing pipe is sleeved outside the third rear punch rod, the third rear material pushing thimble penetrates through the third fixed die and props against the third rear material pushing pipe, the third rear material pushing pipe props against the periphery of the cylindrical blank, and the third rear punch rod is inserted into the first center blind hole to fix the blank.

5. The forming die set for the special-shaped hole bush of the flange according to claim 1, wherein the forming die set for the flange comprises a fourth die shell and a fourth fixed die, a fourth front punch backing bar, a fourth front punch rod, a fourth front material pushing pipe and a fourth front material pushing thimble are arranged in the fourth die shell, the fourth front punch rod is abutted against the fourth front punch backing bar, the fourth front punch rod penetrates through the fourth die shell, the fourth front material pushing pipe is sleeved outside the fourth front punch rod, the fourth front material pushing thimble penetrates through the fourth fixed die and is abutted against the fourth front material pushing pipe, the fourth front material pushing pipe is abutted against the periphery of the cylindrical blank, and the fourth front punch rod is inserted into the second positioning center blind hole to fix the blank; the fourth die is internally provided with a fourth rear punch pad rod, a fourth rear punch rod, a fourth rear material pushing pipe and a fourth rear material pushing thimble, the fourth rear punch rod props against the fourth rear punch pad rod, the fourth rear punch rod penetrates through the fourth die, the fourth rear material pushing pipe is sleeved outside the fourth rear punch rod, the fourth rear material pushing thimble penetrates through the fourth die and props against the fourth rear material pushing pipe, the fourth rear material pushing pipe props against the periphery of the cylindrical blank, the fourth rear punch rod is inserted into the first center blind hole to fix the blank, and the fourth die shell applies pressure downwards to enable the fourth die shell and the fourth die to form a flange part.

6. The forming die set for the flanged special-shaped hole bushing of claim 1, wherein the cylindrical hole forming die comprises a fifth die shell and a fifth fixed die, a fifth front punch pad rod and a fifth front punch rod are arranged in the fifth die shell, the fifth front punch rod is pressed against the fifth front punch pad rod, and the fifth front punch rod passes through the fifth die shell; the punching die is characterized in that a fifth rear punch pad rod, a fifth rear punch rod, a fifth rear pushing pipe and a fifth rear pushing thimble are arranged in the fifth fixed die, the fifth rear punch rod abuts against the fifth rear punch pad rod, the fifth rear punch rod penetrates through the fifth fixed die, the fifth rear pushing pipe is sleeved outside the fifth rear punch rod, the fifth rear pushing thimble penetrates through the fifth fixed die and abuts against the fifth rear pushing pipe, the fifth rear pushing pipe abuts against the periphery of the cylindrical blank, the fifth rear punch rod is inserted into the first center blind hole and conducts punching processing on the blank, and therefore the first positioning center blind holes and the second positioning center blind holes on two sides of the blank are communicated.

7. The forming die set for the special-shaped hole bushing of the flange according to claim 1, wherein the special-shaped hole and square hole forming die comprises a sixth punching die shell and a sixth fixed die, a sixth front punching pin, a sixth front punching rod, a square hole punching rod and a special-shaped hole punching rod are arranged in the sixth punching die shell, the sixth front punching rod is abutted against the sixth front punching pin, the sixth front punching rod penetrates through the sixth punching die shell, one side of the square hole punching rod is abutted against the sixth front punching pin, the other side of the square hole punching rod is punched for a square hole in the flange plate, one side of the special-shaped hole punching rod is abutted against the sixth front punching pin, and the other side of the special-shaped hole punching rod is punched for a special-shaped hole in the flange plate; and a material pushing punch rod is arranged in the sixth fixed die and is respectively propped against the lower part of the blank, the lower part of the square hole punch rod and the lower part of the special-shaped hole punch rod.

8. The forming die set for the flange special-shaped hole bushing according to claim 1, wherein the shaping die, the primary round hole preforming die, the secondary round hole preforming die, the flange forming die, the cylindrical hole forming die, the special-shaped hole and the square hole forming die are all arranged on a multi-station cold heading screw machine for use.