CN101648228A - Multi-station cold extrusion molding method of sleeve - Google Patents
Multi-station cold extrusion molding method of sleeve Download PDFInfo
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- CN101648228A CN101648228A CN200910102041A CN200910102041A CN101648228A CN 101648228 A CN101648228 A CN 101648228A CN 200910102041 A CN200910102041 A CN 200910102041A CN 200910102041 A CN200910102041 A CN 200910102041A CN 101648228 A CN101648228 A CN 101648228A
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- 238000000641 cold extrusion Methods 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000000465 moulding Methods 0.000 title abstract description 4
- 239000000463 material Substances 0.000 claims abstract description 105
- 238000011282 treatment Methods 0.000 claims abstract description 11
- 238000007493 shaping process Methods 0.000 claims abstract description 9
- 230000007704 transition Effects 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 239000002699 waste material Substances 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000007514 turning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
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Abstract
The invention provides a multi-station cold extrusion molding method of a sleeve, which comprises the step of forming a cold extrusion material part by material breaking, wherein the following cold extrusion treatment is carried out after the material breaking: shaping and edge-binding the end surface of the material part needing to dig the hexagonal hole; the rear part of the material part is contracted to form a guide hole at the rear part of the material part; digging a positioning hole on the end surface of the hexagonal hole to be dug; digging a hexagonal hole and extending the material part; digging a middle round hole of the sleeve, and forming a guide hole at the bottom of the middle round hole; backwards digging a square hole on the basis of the guide hole at the bottom of the middle round hole; a square hole is dug forwards on the basis of the guide hole on the end surface of the rear part; and (4) opening the backwards dug square hole and the forwards dug square hole. The invention can make the sleeve by adopting a cold extrusion method, has high speed, high precision and high production efficiency, reduces waste materials even has no waste materials, greatly saves raw materials and reduces production cost. In addition, the cold extrusion improves the mechanical property of the product, ensures the product quality and ensures that the product has more advantages in use function.
Description
Technical field
The present invention relates to the manufacturing technology field of extruded sleeve.
Background technology
Sleeve is a kind of instrument commonly used, the two-stage cylinder of its profile for constituting by first cylinder and second cylinder, second cylinder is thin than first cylinder, sleeve has central through hole, central through hole comprises the cubic hole section coaxial with the hexagonal hole section in the hexagonal hole section that cooperates with nut in first cylinder, second cylinder, between cubic hole section and the hexagonal hole section middle circular hole portion is arranged.At present, make sleeve and generally adopt turning, operation is various, and especially the difficulty of processing in hexagonal hole and cubic hole is big, efficient is low, and hole wall is more crude, and product quality can't guarantee.And sleeve has the profile characteristics that have the equivalent diameter difference between bigger, outside first cylinder of central through hole and second cylinder, therefore, with traditional manufacturing process can cause cut the material weight greater than moulding after product weight, waste of raw materials is very big, cost is higher.
Summary of the invention
Technical problem to be solved by this invention provides a kind of multistation cold extrusion forming method of sleeve, can save raw material, reduces production costs, and improves the quality of products.For this reason, the present invention is by the following technical solutions: it comprises that fracture forms the step of cold extrusion materials and parts, behind fracture, is provided with following cold extrusion and handles:
A. need are dug the materials and parts end face shaping bundle limit of hexagonal hole,
B. the end face that need is dug hexagonal hole faces the place ahead, and contract bar and form materials and parts rear portion pilot hole of 2 roads or 3 roads is carried out at the rear portion of materials and parts, and the aperture of described materials and parts rear portion end face pilot hole is the spigot surface shape and greater than the aperture in hole, sleeve four directions,
C. the end face that need are dug hexagonal hole digs locating hole,
D. dig on the basis of locating hole of hexagonal hole end face at need, dig hexagonal hole, and prolong materials and parts,
E. dig the middle circular hole of sleeve in the bottom of hexagonal hole, and form pilot hole in the bottom of middle circular hole,
F. on the basis of the pilot hole bottom the middle circular hole, dig cubic hole backward,
G. on the basis of described rear portion end face pilot hole, dig cubic hole forward,
H. get through cubic hole of digging backward and the cubic hole of digging forward;
Described cold extrusion is handled C and is carried out at cold extrusion processing A or the residing station of cold extrusion treatments B;
Described cold extrusion processing D carries out at same station or the station after the cold extrusion treatments B with the last bar that contracts of cold extrusion treatments B;
F is handled in cold extrusion and cold extrusion processing G carries out at same station, and forms second cylinder thin than first cylinder of sleeve.
For solving the problems of the technologies described above, the present invention also can be by the following technical solutions: it comprises that fracture forms the step of cold extrusion materials and parts, behind fracture, is provided with following cold extrusion and handles:
A. need are dug the materials and parts end face shaping bundle limit of hexagonal hole,
B. the end face that need is dug hexagonal hole faces the place ahead, and contract bar and form materials and parts rear portion pilot hole of 2 roads or 3 roads is carried out at the rear portion of materials and parts, and the aperture of described materials and parts rear portion end face pilot hole is the spigot surface shape and greater than the aperture in hole, sleeve four directions,
C. the end face to the need borehole digs locating hole,
D. on the basis of the locating hole of need borehole end face, dig hexagonal hole, and prolong the non-bar position of contracting of materials and parts, form first cylinder of sleeve,
E. dig the middle circular hole of sleeve in the bottom of hexagonal hole, and form pilot hole in the bottom of middle circular hole,
F.1 to the cold extrusion in 3 roads, on the basis of middle circular hole bottom pilot hole, dig cubic hole downwards, and make second cylinder thin of the bar position elongation formation sleeve that contracts simultaneously than first cylinder near the materials and parts bottom,
G. dash logical cubic hole downwards;
Described cold extrusion is handled C and is carried out at residing station at cold extrusion processing A or cold extrusion treatments B;
Described cold extrusion processing D carries out at a same station or a back station with the bar that contracts at last of cold extrusion treatments B.
Cold extrusion is a kind of plastic working technique, and it makes metal volume make plastic transfer under the prerequisite of not destroying metalline, reaches few cutting, does not have cutting and make metal forming.Form a large amount of metal debris when so just having avoided machining, save iron and steel and various metal material in a large number.
The design and the procedure arrangement that carry out station at target product are one of cold-stamped emphasis, the present invention is by rationally delineating the station operation, make sleeve can adopt the manufacturing of cold-stamped method, speed is fast, the precision height, the production efficiency height, can not adopt or adopt turning boring seldom, cut material weight product weight after the moulding no better than, less waste material even do not have waste material, save material greatly, reduce production costs.And cold extrusion makes metal material produce plastic deformation, and the metal inside tissue is changed, and the pulling force aspect more is added with raising, has improved mechanical performance of products, has guaranteed product quality, makes product have more advantage on function of use.
Description of drawings
Fig. 1 is the cold extrusion station schematic diagram of embodiment 1 provided by the present invention.
Fig. 2 is the A-A cutaway view of Fig. 1.
Fig. 3 is the B-B cutaway view of Fig. 1.
The specific embodiment
The present invention includes the step of fracture formation cold extrusion materials and parts, raw materials used is the steel profile of circle for the cross section.Behind fracture, it carries out cold extrusion in proper order by following station, in drawing and description specifically describe, for materials and parts, the upper surface is front end face, the lower surface is rear end face, and the upper end of materials and parts is described materials and parts front end or head, and the lower end of materials and parts is described materials and parts rear end or afterbody, downward direction can be understood as direction backward, direction upwards can be understood as direction forward, unless specialize, is circular hole otherwise the hole of being dug is circle cross-section:
(1). the cold extrusion materials and parts, to the shaping bundle limit, rear end of materials and parts, make its periphery 11 smooth mellow and full, and form certain gradient or radian, mould is located with materials and parts when helping down the step cold extrusion, and raising cold extrusion quality also reduces the mould loss;
(2). with materials and parts Rotate 180 degree, the cold extrusion materials and parts, to the front end face of postrotational materials and parts towards locating hole 12, to the rear portion of the postrotational materials and parts bar that contracts, form first cylinder of sleeve and the smooth transition surface 1 between second cylinder between the bar part 13 that contracts and the bar part of not contracting, materials and parts do not contract that the height of bar part 14 equates with the height of the hexagonal hole 2 of sleeve or are bigger, like this, can reduce the plastic transfer amount of follow-up cold-extruded constrictor and improve the forming quality of hexagonal hole; Described hexagonal hole is the hexagonal hole of corresponding nut or six side's extension bars.
(3). the cold extrusion materials and parts, on the basis of locating hole 12, dig the hexagonal hole 2 of sleeve, and prolong the non-bar position of contracting of materials and parts, form first cylinder 3 of sleeve; To the rear portion of the materials and parts bar 15 that further contracts, and formation materials and parts rear portion end face pilot hole 16, the aperture of described materials and parts rear portion end face pilot hole is the spigot surface shape and greater than the aperture in hole, sleeve four directions, like this, in follow-up cold extrusion process, mould and materials and parts are located in the time of not only can utilizing pilot hole to help to go on foot cold extrusion down, improve the cold extrusion quality and also reduce the mould loss, and the bore portions of pilot hole energy after the cubic hole of sleeve is shaped is direct as the spigot surface 5 around the cubic hole of sleeve simultaneously;
(4). the cold extrusion materials and parts, dig the middle circular hole 6 of sleeve, and form pilot hole 17 in the bottom of middle circular hole in the bottom of described hexagonal hole;
(5). the cold extrusion materials and parts, on the basis of the pilot hole bottom the middle circular hole, dig cubic hole 18 backward, between cubic hole 18 and middle circular hole 6, form smooth transition surface 7, on the basis of described rear portion end face pilot hole 16, dig cubic hole 19 forward, make the bar position elongation of contracting form second cylinder 8 thin of sleeve than first cylinder, two cubic Kong Wei get through, and pilot hole 20 is formed on the bottom;
(6). dash cubic hole of digging after leading to 18 and the cubic hole of digging forward 19, form the cubic hole 4 of sleeve.
In Fig. 1, begin to the right side from left side figure, represent the materials and parts shape behind station 1, station 2, station 3, station 4, station 5, station 6 respectively.
The present invention includes the step of fracture formation cold extrusion materials and parts, behind fracture, it carries out cold extrusion in proper order by following station:
(1). the cold extrusion materials and parts, to the shaping bundle limit, rear end of materials and parts;
(2). with materials and parts Rotate 180 degree, the cold extrusion materials and parts, to the front end face of postrotational materials and parts towards locating hole, to the rear portion of the postrotational materials and parts bar that contracts, contract bar and do not contract between the bar first cylinder that forms sleeve and the smooth transition surface between second cylinder, described materials and parts do not contract that the height of bar part equates with the height of the hexagonal hole of sleeve or are bigger;
(3). the cold extrusion materials and parts, on the basis of front end face locating hole, dig the hexagonal hole of sleeve, and prolong the non-bar position of contracting of materials and parts, form first cylinder of sleeve; To the rear portion of the materials and parts bar that further contracts, and form materials and parts rear portion end face pilot hole, the aperture of described materials and parts rear portion end face pilot hole is the spigot surface shape and greater than the aperture in hole, sleeve four directions;
(4). the cold extrusion materials and parts, dig the middle circular hole of sleeve, and form pilot hole in the bottom of middle circular hole in the bottom of described hexagonal hole;
(5). the cold extrusion materials and parts, on the basis of the pilot hole bottom the middle circular hole, dig cubic hole backward, near the materials and parts afterbody, and make the bar position elongation of contracting form second cylinder thin of sleeve simultaneously than first cylinder, between cubic hole and middle circular hole, form smooth transition surface, form pilot hole in the bottom in cubic hole;
(6). dash logical cubic hole, form the cubic hole of sleeve.
The sleeve of making through present embodiment is identical with the shape of the sleeve that embodiment 1 makes.
Claims (4)
1. the multistation cold extrusion forming method of sleeve is characterized in that it comprises that fracture forms the step of cold extrusion materials and parts, behind fracture, is provided with following cold extrusion processing:
A. need are dug the materials and parts end face shaping bundle limit of hexagonal hole,
B. the end face that need is dug hexagonal hole faces the place ahead, and contract bar and form materials and parts rear portion pilot hole of 2 roads or 3 roads is carried out at the rear portion of materials and parts, and the aperture of described materials and parts rear portion end face pilot hole is the spigot surface shape and greater than the aperture in hole, sleeve four directions,
C. the end face that need are dug hexagonal hole digs locating hole,
D. dig on the basis of locating hole of hexagonal hole end face at need, dig hexagonal hole, and prolong materials and parts,
E. dig the middle circular hole of sleeve in the bottom of hexagonal hole, and form pilot hole in the bottom of middle circular hole,
F. on the basis of the pilot hole bottom the middle circular hole, dig cubic hole backward,
G. on the basis of described rear portion end face pilot hole, dig cubic hole forward,
H. dash cubic hole of digging after leading to and the cubic hole of digging forward;
Described cold extrusion is handled C and is carried out at cold extrusion processing A or the residing station of cold extrusion treatments B;
Described cold extrusion processing D carries out at same station or the station after the cold extrusion treatments B with the last bar that contracts of cold extrusion treatments B;
F is handled in cold extrusion and cold extrusion processing G carries out at same station, and forms second cylinder thin than first cylinder of sleeve.
2. the multistation cold extrusion forming method of sleeve as claimed in claim 1 is characterized in that it carries out cold extrusion in proper order by following station:
(1). the cold extrusion materials and parts, to the shaping bundle limit, rear end of materials and parts;
(2). with materials and parts Rotate 180 degree, the cold extrusion materials and parts, to the front end face of postrotational materials and parts towards locating hole, to the rear portion of the postrotational materials and parts bar that contracts, contract bar and do not contract between the bar first cylinder that forms sleeve and the smooth transition surface between second cylinder, described materials and parts do not contract that the height of bar part equates with the height of the hexagonal hole of sleeve or are bigger;
(3). the cold extrusion materials and parts, on the basis of front end face locating hole, dig hexagonal hole, and prolong the non-bar position of contracting of materials and parts, form first cylinder of sleeve; To the rear portion of the materials and parts bar that further contracts, and form materials and parts rear portion end face pilot hole, the aperture of described materials and parts rear portion end face pilot hole is the spigot surface shape and greater than the aperture in hole, sleeve four directions;
(4). the cold extrusion materials and parts, dig the middle circular hole of sleeve, and form pilot hole in the bottom of middle circular hole in the bottom of hexagonal hole;
(5). the cold extrusion materials and parts, on the basis of the pilot hole bottom the middle circular hole, dig cubic hole backward, between cubic hole and middle circular hole, form smooth transition surface, on the basis of described rear portion end face pilot hole, dig cubic hole forward, make the bar position elongation of contracting form second cylinder thin of sleeve than first cylinder, two cubic Kong Wei get through, and pilot hole is formed on the bottom;
(6). the cold extrusion materials and parts, dash and lead to cubic hole of digging down and the cubic hole of upwards digging, form the cubic hole of sleeve.
3. the multistation cold extrusion forming method of sleeve is characterized in that it comprises that fracture forms the step of cold extrusion materials and parts, behind fracture, is provided with following cold extrusion processing:
A. need are dug the materials and parts end face shaping bundle limit of hexagonal hole,
B. the end face that need is dug hexagonal hole faces the place ahead, and contract bar and form materials and parts rear portion pilot hole of 2 roads or 3 roads is carried out at the rear portion of materials and parts, and the aperture of described materials and parts rear portion end face pilot hole is the spigot surface shape and greater than the aperture in hole, sleeve four directions,
C. the end face to the need borehole digs locating hole,
D. on the basis of the locating hole of need borehole end face, dig hexagonal hole, and prolong the non-bar position of contracting of materials and parts, form first cylinder of sleeve,
E. dig the middle circular hole of sleeve in the bottom of hexagonal hole, and form pilot hole in the bottom of middle circular hole,
F.1 to the cold extrusion in 3 roads, on the basis of middle circular hole bottom pilot hole, dig cubic hole downwards, and make second cylinder thin of the bar position elongation formation sleeve that contracts simultaneously than first cylinder near the materials and parts bottom,
G. dash logical cubic hole downwards;
Described cold extrusion is handled C and is carried out at residing station at cold extrusion processing A or cold extrusion treatments B;
Described cold extrusion processing D carries out at a same station or a back station with the bar that contracts at last of cold extrusion treatments B.
4. the multistation cold extrusion forming method of sleeve as claimed in claim 1 is characterized in that it carries out cold extrusion in proper order by following station:
(1). the cold extrusion materials and parts, to the rear end shaping of materials and parts;
(2). with materials and parts Rotate 180 degree, the cold extrusion materials and parts, to the front end face of postrotational materials and parts towards locating hole, to the rear portion of the postrotational materials and parts bar that contracts, the do not contract height of bar part of contract bar and do not contract between the bar first cylinder that forms sleeve and the smooth transition surface between second cylinder, described materials and parts is equal or bigger with the height of the hexagonal hole of the corresponding nut of sleeve;
(3). the cold extrusion materials and parts, on the basis of front end face locating hole, dig the hexagonal hole of corresponding nut, and prolong the non-bar position of contracting of materials and parts, form first cylinder of sleeve; To the rear portion of the materials and parts bar that further contracts, and form materials and parts rear portion end face pilot hole, the aperture of described materials and parts rear portion end face pilot hole is the spigot surface shape and greater than the aperture in hole, sleeve four directions;
(4). the cold extrusion materials and parts, dig the middle circular hole of sleeve, and form pilot hole in the bottom of middle circular hole in the bottom of hexagonal hole;
(5). the cold extrusion materials and parts, on the basis of the pilot hole bottom the middle circular hole, dig cubic hole backward, near the materials and parts afterbody, and make the bar position elongation of contracting form second cylinder thin of sleeve simultaneously than first cylinder, between cubic hole and middle circular hole, form smooth transition surface, form pilot hole in the bottom in cubic hole;
(6). dash logical cubic hole, form the cubic hole of sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101020410A CN101648228B (en) | 2009-08-27 | 2009-08-27 | Multi-station cold extruding forming method of sleeve barrel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101020410A CN101648228B (en) | 2009-08-27 | 2009-08-27 | Multi-station cold extruding forming method of sleeve barrel |
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| CN101648228A true CN101648228A (en) | 2010-02-17 |
| CN101648228B CN101648228B (en) | 2011-07-13 |
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| CN2009101020410A Active CN101648228B (en) | 2009-08-27 | 2009-08-27 | Multi-station cold extruding forming method of sleeve barrel |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102172656A (en) * | 2010-12-10 | 2011-09-07 | 深圳航空标准件有限公司 | Resonance rod cold heading manufacturing method |
| CN102179670A (en) * | 2011-04-06 | 2011-09-14 | 浙江拓进五金工具有限公司 | Method for manufacturing tobacco holder wrench |
| CN102581052A (en) * | 2012-02-13 | 2012-07-18 | 浙江拓进五金工具有限公司 | Multi-position cold extrusion molding method for universal sockets |
| CN103143580A (en) * | 2013-03-12 | 2013-06-12 | 宁波安拓实业有限公司 | Manufacturing process of conical sleeve |
| CN103341737A (en) * | 2013-07-12 | 2013-10-09 | 盐城工学院 | Machining method for improving coaxiality of special-shaped cavity and internal spline of start guide cylinder |
| CN103934396A (en) * | 2014-04-10 | 2014-07-23 | 卓越紧固***（上海）有限公司 | Bolt bush manufacturing method and bolt bush assembly |
| CN104999022A (en) * | 2015-07-20 | 2015-10-28 | 宁波斯耐奇金属制品有限公司 | Sleeve cold heading forming technology |
| CN105290289A (en) * | 2015-10-28 | 2016-02-03 | 浙江名将汽配有限公司 | Manufacturing die and manufacturing method for inner hexagonal socket |
| CN108161352A (en) * | 2017-12-21 | 2018-06-15 | 宁波昌华铜制品有限公司 | The production method of copper piece |
| CN110586845A (en) * | 2019-08-29 | 2019-12-20 | 宁波安拓实业有限公司 | Manufacturing method of large square nut for automobile chassis connecting system |
| CN112475205A (en) * | 2020-11-11 | 2021-03-12 | 金华市忠信五金工具有限公司 | Method for forming plum-blossom-shaped batch head sleeve |
| CN112475209A (en) * | 2020-11-14 | 2021-03-12 | 金华市忠信五金工具有限公司 | Forming method of one-line-batch head sleeve |
| CN112475207A (en) * | 2020-11-14 | 2021-03-12 | 金华市忠信五金工具有限公司 | Forming method of round-head screwdriver sleeve |
| CN112475208A (en) * | 2020-11-14 | 2021-03-12 | 金华市忠信五金工具有限公司 | Forming method of cross-shaped batch head sleeve |
| CN112475206A (en) * | 2020-11-11 | 2021-03-12 | 金华市忠信五金工具有限公司 | Forming method of hexagonal screwdriver bit sleeve |
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2009
- 2009-08-27 CN CN2009101020410A patent/CN101648228B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102172656B (en) * | 2010-12-10 | 2013-05-08 | 深圳航空标准件有限公司 | Resonance rod cold heading manufacturing method |
| CN102172656A (en) * | 2010-12-10 | 2011-09-07 | 深圳航空标准件有限公司 | Resonance rod cold heading manufacturing method |
| CN102179670A (en) * | 2011-04-06 | 2011-09-14 | 浙江拓进五金工具有限公司 | Method for manufacturing tobacco holder wrench |
| CN102179670B (en) * | 2011-04-06 | 2013-04-24 | 浙江拓进五金工具有限公司 | Method for manufacturing tobacco holder wrench |
| CN102581052A (en) * | 2012-02-13 | 2012-07-18 | 浙江拓进五金工具有限公司 | Multi-position cold extrusion molding method for universal sockets |
| CN103143580A (en) * | 2013-03-12 | 2013-06-12 | 宁波安拓实业有限公司 | Manufacturing process of conical sleeve |
| CN103143580B (en) * | 2013-03-12 | 2015-05-20 | 宁波安拓实业有限公司 | Manufacturing process of conical sleeve |
| CN103341737A (en) * | 2013-07-12 | 2013-10-09 | 盐城工学院 | Machining method for improving coaxiality of special-shaped cavity and internal spline of start guide cylinder |
| CN103341737B (en) * | 2013-07-12 | 2015-08-05 | 盐城工学院 | A kind of processing method improving the special-shaped chamber of starting guide cylinder and internal spline coaxiality |
| CN103934396B (en) * | 2014-04-10 | 2016-08-24 | 卓越紧固***（上海）有限公司 | Bolt bush manufacture method and bolt bush molectron thereof |
| CN103934396A (en) * | 2014-04-10 | 2014-07-23 | 卓越紧固***（上海）有限公司 | Bolt bush manufacturing method and bolt bush assembly |
| CN104999022A (en) * | 2015-07-20 | 2015-10-28 | 宁波斯耐奇金属制品有限公司 | Sleeve cold heading forming technology |
| CN105290289A (en) * | 2015-10-28 | 2016-02-03 | 浙江名将汽配有限公司 | Manufacturing die and manufacturing method for inner hexagonal socket |
| CN108161352A (en) * | 2017-12-21 | 2018-06-15 | 宁波昌华铜制品有限公司 | The production method of copper piece |
| CN110586845A (en) * | 2019-08-29 | 2019-12-20 | 宁波安拓实业有限公司 | Manufacturing method of large square nut for automobile chassis connecting system |
| CN112475205A (en) * | 2020-11-11 | 2021-03-12 | 金华市忠信五金工具有限公司 | Method for forming plum-blossom-shaped batch head sleeve |
| CN112475206A (en) * | 2020-11-11 | 2021-03-12 | 金华市忠信五金工具有限公司 | Forming method of hexagonal screwdriver bit sleeve |
| CN112475209A (en) * | 2020-11-14 | 2021-03-12 | 金华市忠信五金工具有限公司 | Forming method of one-line-batch head sleeve |
| CN112475207A (en) * | 2020-11-14 | 2021-03-12 | 金华市忠信五金工具有限公司 | Forming method of round-head screwdriver sleeve |
| CN112475208A (en) * | 2020-11-14 | 2021-03-12 | 金华市忠信五金工具有限公司 | Forming method of cross-shaped batch head sleeve |
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| CN101648228B (en) | 2011-07-13 |
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Denomination of invention: Multi station cold extrusion forming method of sleeve Effective date of registration: 20220704 Granted publication date: 20110713 Pledgee: Industrial and Commercial Bank of China Limited Shangyu sub branch Pledgor: ZHEJIANG TUOJIN HARDWARE TOOL Co.,Ltd. Registration number: Y2022330001236 |
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Date of cancellation: 20231220 Granted publication date: 20110713 Pledgee: Industrial and Commercial Bank of China Limited Shangyu sub branch Pledgor: ZHEJIANG TUOJIN HARDWARE TOOL Co.,Ltd. Registration number: Y2022330001236 |