CN110586845B - Manufacturing method of large square nut for automobile chassis connecting system - Google Patents
Manufacturing method of large square nut for automobile chassis connecting system Download PDFInfo
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- CN110586845B CN110586845B CN201910805643.6A CN201910805643A CN110586845B CN 110586845 B CN110586845 B CN 110586845B CN 201910805643 A CN201910805643 A CN 201910805643A CN 110586845 B CN110586845 B CN 110586845B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/10—Piercing billets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/64—Making machine elements nuts
- B21K1/70—Making machine elements nuts of special shape, e.g. self-locking nuts, wing nuts
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Abstract
The invention provides a manufacturing method of a large square nut for an automobile chassis connecting system, which can manufacture a square nut through a cold heading method, wherein the square nut comprises a round-corner square nut head and a cylindrical part at the lower part of the round-corner square nut head, and axial grooves are arranged in the middles of two opposite sides of the round-corner square nut head. The large square nut for the automobile chassis connecting system can be formed in one step by adopting a multi-station cold extrusion forming technology through reasonable step arrangement, the material is saved, the process steps are few, only inner hole tapping is needed in the subsequent process, the material can be saved by 11 percent, the production speed can reach 60 PCS/min, the average daily output is 28800PCS, the production cost is reduced by more than 50 percent, and the waste of manpower and materials is reduced. The cold extrusion molding product has the advantages of smooth surface, size precision control, stable product quality, firmer structure, high use safety, strong bearing capacity, quickness and easiness in installation and the like. The product is widely applied to the chassis connecting system of high-grade automobiles.
Description
Technical Field
The invention relates to the technical field of multi-station cold heading, in particular to a manufacturing method of a large square nut for an automobile chassis connecting system.
Background
The cross section of the large square nut for the automobile chassis connecting system is approximately in a T-shaped structure, the difference between the shape and the size of the top and the lower part of the top is large, the top is also provided with an ear groove on the side surface, and the whole process is difficult to manufacture by adopting a cold extrusion process.
The large square nut for the automobile chassis connecting system comprises a round corner square nut head and a cylindrical part at the lower part of the round corner square nut head, wherein a central hole of the nut penetrates through the cylindrical part at the lower part and the round corner square nut head, the length of a diagonal line of the round corner square nut head is basically 1.8-2.2 times of the diameter of the cylindrical part at the lower part, the four round corner square nut head is of a thin plate structure, the ratio of the length of the cylindrical part to the thickness of the round corner square nut head reaches 3.5-4.5 times, and axial grooves, commonly called as ear grooves, are formed in the middle parts of two opposite sides of the round corner square nut head.
The large square nut machining workload for the automobile chassis connecting system used at present in China is large, materials are consumed, the production speed is extremely low, and the market requirements cannot be met.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for manufacturing a large square nut for an automobile chassis connecting system, which can directly manufacture the large square nut for the automobile chassis connecting system by a cold extrusion method, improve the utilization rate and quality of raw materials and improve the production efficiency. Therefore, the invention adopts the following technical scheme:
the manufacturing method of the large square nut for the automobile chassis connecting system is characterized in that the large square nut for the automobile chassis connecting system comprises a fillet square nut head and a cylindrical part at the lower part of the fillet square nut head, a central hole of the nut penetrates through the cylindrical part and the fillet square nut head, the length of a diagonal line of the fillet square nut head is 1.8-2.2 times of the diameter of the cylindrical part, the fillet square nut head is of a thin plate structure, the ratio of the length of the cylindrical part to the thickness of the fillet square nut head is 3.5-4.5, and axial grooves are formed in the middle parts of two opposite sides of the fillet square nut head;
the manufacturing method comprises the following steps:
(1) feeding the disc round material into a cold heading forming machine through a feeding wheel to automatically shear the disc round material into a single raw material piece, wherein the diameter of the disc round material is basically consistent with that of the cylindrical part, and the length dimension of the raw material piece is larger than the height dimension of the large square nut;
(2) the raw material piece is moved into a first die opening of a cold heading forming machine, the raw material piece is ejected into a first die concave die by a punching tool at the front end of the first die, and a first molded finished product is manufactured by cold heading in the first die, wherein a positioning hole is formed in the front end of the first molded finished product on the basis of the raw material piece, and an arc angle is formed in the rear end of the first molded finished product;
(3) the first molded finished product is translated to a second mold opening, the first molded finished product is pushed into a second mold concave die by a punching tool at the front end of the second mold, and the front end of the second molded finished product is upset into a counter bore and the rear end is contracted through cold heading in the second mold; the depth of the counter bore is consistent with the height of the cylindrical part, the wall thickness of the counter bore is consistent with the wall thickness of a central hole of the cylindrical part, and a second molded finished product is manufactured.
(4) Turning over the second molded finished product and moving the second molded finished product to a third mold opening, ejecting the second molded finished product into a third mold concave die by a punching tool at the front end of the third mold, and forming a preparation shape of a fillet square nut head of the large square nut by cold heading at the front end of the third molded finished product through cold heading in the third mold, at the lower part of the preliminary shape, the automobile chassis connection system is formed by upsetting the cylindrical portion of the large square nut and the center hole thereof, the cross-sectional outer contour shape of the prepared-shape main body is consistent with but slightly reduced from that of the round-corner square nut head, the thickness of the preliminary-shaped body is slightly thicker than that of the round-corner square nut head, the front end of the preliminary-shaped body is upset to form a positioning hole, the four corners of the front end of the main body are respectively provided with a convex block structure to manufacture a third molded finished product;
(5) the third molded finished product is translated to a fourth mold opening, the third molded finished product is pushed into a fourth mold concave die by a punching tool at the front end of the fourth mold, and the fourth molded finished product is manufactured by cold upsetting in the fourth mold, so that the front end of the fourth molded finished product forms a fillet square nut head prototype with the cross section outer contour size and the thickness of the fillet square nut head, but does not have the axial groove, and the fillet square nut head prototype of the fourth molded finished product is extruded and compacted at the part, which is radially positioned outside the cylindrical part, of the fillet square nut head prototype by utilizing the convex block configuration of four corners of the third molded finished product to manufacture the fourth molded finished product;
(6) the fourth molded finished product is horizontally moved to a fifth mold opening, the fourth molded finished product is pushed into a fourth mold concave die by a punching tool at the front end of the fifth mold, and the fillet square nut head prototype of the fourth molded finished product is subjected to cold extrusion to form the axial groove on two opposite edges of the fillet square nut head prototype through cold heading manufacturing in the fifth mold, so that the fifth molded finished product is manufactured;
(7) and translating the fifth molded finished product to a sixth mold, carrying out iron core penetration on the fifth molded finished product, penetrating and forming a central hole of the nut, and manufacturing the large square nut for the automobile chassis connecting system.
The large square nut for the automobile chassis connecting system can be formed in one step by adopting a multi-station cold extrusion forming technology through reasonable step arrangement, the material is saved, the process steps are few, only inner hole tapping is needed in the subsequent process, the material can be saved by 11 percent, the production speed can reach 60 PCS/min, the average daily output is 28800PCS, the production cost is reduced by more than 50 percent, and the waste of manpower and materials is reduced. The cold extrusion molding product has the advantages of smooth surface, size precision control, stable product quality, firmer structure, high use safety, strong bearing capacity, quickness and easiness in installation and the like. The product is widely applied to the chassis connecting system of high-grade automobiles.
Drawings
FIG. 1 is a flow chart of the production process of the present invention.
Fig. 2, 3, 4 and 5 are top views of a molded product No. three, a molded product No. four, a molded product No. five and a molded product No. six, respectively.
Detailed Description
Reference is made to the accompanying drawings. The invention relates to a manufacturing method of a large square nut for an automobile chassis connecting system, which comprises a fillet square nut head 101, a cylindrical part 102 at the lower part of the fillet square nut head, a central hole 103 of the nut penetrates through the cylindrical part 102 and the fillet square nut head 101, the length L of a diagonal line of the fillet square nut head 101 is 1.8-2.2 times of the diameter D of the cylindrical part 102, the length L of the diagonal line is the length of a connecting line between the vertexes of the diagonal arcs, the fillet square nut head 101 is in a thin plate structure, the ratio of the length H of the cylindrical part to the thickness T of the fillet square nut head is 3.5-4.5, and axial grooves 104 are arranged in the middle parts of two opposite sides of the fillet square nut head 101.
Annealing the plate raw material, then performing phosphate surface treatment, fine drawing and sizing treatment, and then performing the following steps:
(1) and automatically shearing the disc material into single raw material pieces 100a by feeding the disc material into a cold heading forming machine through a feeding wheel, wherein the diameter of the disc material is basically consistent with that of the cylindrical part 102, and the length dimension of the raw material pieces 100a is larger than the height dimension of the large square nut 100.
(2) Transferring the raw material part 100a into a first die opening of a cold heading forming machine, ejecting the raw material part 100a into a first die concave die by a punching tool at the front end of the first die, and performing cold heading manufacturing in the first die to ensure that the front end of a first molded finished product 1 is headed out of a positioning hole 11 and the rear end is headed out of an arc angle 12 on the basis of the raw material part 100 a;
(3) the first molded finished product 1 is translated to a second mold opening, the first molded finished product 1 is pushed into a second mold concave die by a punching tool at the front end of the second mold, and the front end of the second molded finished product is upset out of a counter bore 21 and the rear end is contracted 22 through cold heading in the second mold; the depth of the counter bore 21 is consistent with the height H of the cylindrical part, the wall thickness of the counter bore 21 is consistent with the wall thickness of a central hole of the cylindrical part, and a second molded finished product 2 is manufactured.
(4) And the second molded finished product 2 is overturned and moved to a third mold opening, the second molded finished product 2 is pushed into a third mold concave die by a punching tool at the front end of the third mold, the third molded finished product 3 is manufactured by cold upsetting in the third mold, the front end of the third molded finished product 3 forms a prepared shape of a fillet tetragonal nut head 101 of the large tetragonal nut by using the shrinkage 22 in the second molded finished product 2 and the part outside the axial sunk hole depth, the third molded finished product 3 is arranged at the lower part of the prepared shape, and the automobile chassis connecting system is formed by upsetting the cylindrical part 101 of the large tetragonal nut and the central hole 103b thereof (namely the section of the central hole 103 in the cylindrical part) and keeps the shape in the subsequent cold extrusion process.
The cross-sectional outer contour shape 32 of the preliminary-shape body 31 is identical with but slightly reduced from that of a round-corner square nut head, the thickness T1 of the preliminary-shape body 31 is slightly thicker than that of the round-corner square nut head, the front end of the preliminary-shape body 31 is upset to form a positioning hole 33, and convex block configurations 34 are respectively arranged at four corners of the front end of the body 31, so that a third molded product 3 is manufactured.
(5) And translating the third molded finished product 3 to a fourth mold opening, pushing the third molded finished product 3 into a fourth mold concave die by a punch at the front end of the fourth mold, forming a fillet square nut head prototype 41 with the cross section outer contour size and the thickness of the fillet square nut head at the front end of the fourth molded finished product 4 through cold upsetting in the fourth mold, but not having the axial groove 104, pressing and compacting a part 42 of the fillet square nut head prototype 41 of the fourth molded finished product, which is positioned outside the cylindrical part in the radial direction, by utilizing the convex block configuration 34 at the four corners of the third molded finished product, further upsetting the hole on the basis of the positioning hole of the third molded finished product, and manufacturing the fourth molded finished product 4 by using a repeated drawing 43 as a hole after upsetting.
(6) The fourth molded finished product 4 is translated to a fifth mold opening, the fourth molded finished product 4 is pushed into a fourth mold concave die by a punching tool at the front end of the fifth mold, the fourth molded finished product is manufactured by cold heading in the fifth mold, a fillet square nut blank 41 of the fourth molded finished product 4 is cold extruded out of the axial groove 104 on two opposite sides of the fillet square nut blank, and a fifth molded finished product 5 is manufactured, wherein the fillet square nut blank which is not penetrated through a central hole at the front end of the fifth molded finished product is not shown by a reference numeral 51, and the blank 51 is the same as the fillet square nut 101 of the large square nut 100 for the automobile chassis connecting system except that the blank is not penetrated through the central hole.
(7) And translating the fifth molded finished product 5 to a sixth mold, and carrying out iron core passing 61, through hole 43 and central hole 103b on the fifth molded finished product to form a central hole 104 of the nut so as to manufacture the large square nut 100 for the automobile chassis connecting system.
The above description is only an embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any changes or modifications within the scope of the present invention by those skilled in the art are covered by the present invention.
Claims (1)
1. The manufacturing method of the large square nut for the automobile chassis connecting system is characterized in that the large square nut for the automobile chassis connecting system comprises a fillet square nut head and a cylindrical part at the lower part of the fillet square nut head, a central hole of the nut penetrates through the cylindrical part and the fillet square nut head, the length of a diagonal line of the fillet square nut head is 1.8-2.2 times of the diameter of the cylindrical part, the fillet square nut head is of a thin plate structure, the ratio of the length of the cylindrical part to the thickness of the fillet square nut head is 3.5-4.5, and axial grooves are formed in the middle parts of two opposite sides of the fillet square nut head;
the manufacturing method comprises the following steps:
(1) feeding the disc round material into a cold heading forming machine through a feeding wheel to automatically shear the disc round material into a single raw material piece, wherein the diameter of the disc round material is basically consistent with that of the cylindrical part, and the length dimension of the raw material piece is larger than the height dimension of the large square nut;
(2) the raw material piece is moved into a first die opening of a cold heading forming machine, the raw material piece is ejected into a first die concave die by a punching tool at the front end of the first die, and a first molded finished product is manufactured by cold heading in the first die, wherein a positioning hole is formed in the front end of the first molded finished product on the basis of the raw material piece, and an arc angle is formed in the rear end of the first molded finished product;
(3) the first molded finished product is translated to a second mold opening, the first molded finished product is pushed into a second mold concave die by a punching tool at the front end of the second mold, and the front end of the second molded finished product is upset into a counter bore and the rear end is contracted through cold heading in the second mold; the depth of the counter bore is consistent with the height of the cylindrical part, the wall thickness of the counter bore is consistent with the wall thickness of a central hole of the cylindrical part, and a second molded finished product is manufactured;
(4) turning over the second molded finished product and moving the second molded finished product to a third mold opening, ejecting the second molded finished product into a third mold concave die by a punching tool at the front end of the third mold, and forming a preparation shape of a fillet square nut head of the large square nut by cold heading at the front end of the third molded finished product through cold heading in the third mold, at the lower part of the preliminary shape, the automobile chassis connection system is formed by upsetting the cylindrical portion of the large square nut and the center hole thereof, the cross-sectional outer contour shape of the prepared-shape main body is consistent with but slightly reduced from that of the round-corner square nut head, the thickness of the preliminary-shaped body is slightly thicker than that of the round-corner square nut head, the front end of the preliminary-shaped body is upset to form a positioning hole, the four corners of the front end of the main body are respectively provided with a convex block structure to manufacture a third molded finished product;
(5) the third molded finished product is translated to a fourth mold opening, the third molded finished product is pushed into a fourth mold concave die by a punching tool at the front end of the fourth mold, and the fourth molded finished product is manufactured by cold upsetting in the fourth mold, so that the front end of the fourth molded finished product forms a fillet square nut head prototype with the cross section outer contour size and the thickness of the fillet square nut head, but does not have the axial groove, and the fillet square nut head prototype of the fourth molded finished product is extruded and compacted at the part, which is radially positioned outside the cylindrical part, of the fillet square nut head prototype by utilizing the convex block configuration of four corners of the third molded finished product to manufacture the fourth molded finished product;
(6) the fourth molded finished product is horizontally moved to a fifth mold opening, the fourth molded finished product is pushed into a fourth mold concave die by a punching tool at the front end of the fifth mold, and the fillet square nut head prototype of the fourth molded finished product is subjected to cold extrusion to form the axial groove on two opposite edges of the fillet square nut head prototype through cold heading manufacturing in the fifth mold, so that the fifth molded finished product is manufactured;
(7) and translating the fifth molded finished product to a sixth mold, carrying out iron core penetration on the fifth molded finished product, penetrating and forming a central hole of the nut, and manufacturing the large square nut for the automobile chassis connecting system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910805643.6A CN110586845B (en) | 2019-08-29 | 2019-08-29 | Manufacturing method of large square nut for automobile chassis connecting system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910805643.6A CN110586845B (en) | 2019-08-29 | 2019-08-29 | Manufacturing method of large square nut for automobile chassis connecting system |
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| CN110586845A CN110586845A (en) | 2019-12-20 |
| CN110586845B true CN110586845B (en) | 2021-03-23 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111390083A (en) * | 2020-03-23 | 2020-07-10 | 鹏驰五金制品（昆山）有限公司 | Automobile nut forming process |
| CN113210506B (en) * | 2021-04-29 | 2023-05-09 | 无锡商业职业技术学院 | Manufacturing equipment of large square nut for automobile chassis connecting system |
| CN113857420B (en) * | 2021-08-23 | 2023-07-07 | 宁波安拓实业有限公司 | Manufacturing method of chassis system fixing rod for vehicle |
| CN113787164B (en) * | 2021-08-23 | 2023-07-07 | 宁波安拓实业有限公司 | Method for manufacturing connecting nut blank for hydraulic system of engineering equipment |
| CN115055626A (en) * | 2022-06-23 | 2022-09-16 | 宁波安拓实业有限公司 | Six-station cold extrusion manufacturing method of toothed connection inner pipe for automobile transmission system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SU1804367A3 (en) * | 1990-12-29 | 1993-03-23 | Бeлeбeebckий Зaboд "Abtohopmaль" Boлжckoгo Oб'eдиhehия Пo Пpoизboдctbу Лeгkobыx Abtomoбилeй (Бeлзah Пo Abtobaз) | Method of manufacture of polyhedral nuts with convex-concave side surface and flange |
| RU2254199C1 (en) * | 2003-12-22 | 2005-06-20 | Открытое акционерное общество "Белебеевский завод "Автонормаль" | Method for making self-locking nuts blanks with nylon ring and flange |
| CN101618421B (en) * | 2009-07-17 | 2011-04-27 | 宁波安拓实业有限公司 | Multi-station cold-heading molding method of clutch conical blank |
| CN101618498B (en) * | 2009-07-17 | 2011-05-04 | 宁波安拓实业有限公司 | Manufacturing process of adjusting nut |
| CN101648228B (en) * | 2009-08-27 | 2011-07-13 | 浙江拓进五金工具有限公司 | Multi-station cold extruding forming method of sleeve barrel |
| CN102059306B (en) * | 2010-11-19 | 2015-08-05 | 宁波安拓实业有限公司 | The multi-station cold-heading manufacture method of template die adjusting seat blank |
| CN102125943B (en) * | 2010-11-29 | 2013-08-14 | 宁波安拓实业有限公司 | Manufacturing process of hose coupling |
| CN106475504A (en) * | 2015-08-25 | 2017-03-08 | 上海精拓模具制造有限公司 | A kind of one-shot forming technique of employing Huff die cold-heading I-shaped product with holes |
| CN106180503A (en) * | 2016-08-29 | 2016-12-07 | 苏州工业园区新凯精密五金有限公司 | The cold-heading molding technique of a kind of self-clinching nut and the mould structure of forming embossing tooth thereof |
| CN109513874A (en) * | 2018-12-29 | 2019-03-26 | 苏州工业园区新凯精密五金有限公司 | It is a kind of for manufacturing the cold-heading molding technique and cold heading die group of tetragonal pyramid bottom nut |
| CN109848361B (en) * | 2019-03-20 | 2020-04-14 | 宁波安拓实业有限公司 | Method for manufacturing T-shaped elliptical inner sleeve blank for automobile |
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