CN101780629B - Production process of special shaped screw bolt - Google Patents
Production process of special shaped screw bolt Download PDFInfo
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- CN101780629B CN101780629B CN2010101417875A CN201010141787A CN101780629B CN 101780629 B CN101780629 B CN 101780629B CN 2010101417875 A CN2010101417875 A CN 2010101417875A CN 201010141787 A CN201010141787 A CN 201010141787A CN 101780629 B CN101780629 B CN 101780629B
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Abstract
The invention provides a production process of a special shaped screw bolts. The forming of a screw rod section, circular flanges, a rectangular head and an annular groove of the special shaped screw bolt is realized through four times of cold extrusion, in the first cold extrusion, one end of a blank is formed into the screw rod section of the screw thread rolling front blank diameter through cold extrusion, in the second cold extrusion, the other end of the blank is formed into a pre-formed head through cold extrusion, in the third cold extrusion, the pre-formed head is formed into two flanges through cold extrusion, the two flanges are sequentially connected, in the fourth cold extrusion, the flanges to be processed are formed into the required rectangular head through cold extrusion, and excrescent blanks are extruded to a position between the rectangular head and the circuit flanges. Then, the excrescent blanks are removed for forming the annular groove. The invention solves the problems of multiple production procedures, high production cost, low efficiency and poor product stability of the special shaped screw bolt in the prior art, and is particularly suitable for the production of the special shaped screw bolt.
Description
Technical field
The present invention relates to a kind of production technology of bolt, specifically a kind of production technology of special shaped screw bolt.
Background technology
Bolt is a kind of by head and screw rod securing member dimerous, cooperates with nut usually, is used to be fastenedly connected two parts that have through hole.Bolt is designed to different shapes according to different needs.A kind ofly be used to assemble the special shaped screw bolt that the automobile license plate lamp plaque is used, its head is the rectangle head, described rectangle head has narrow annular groove and round flange, the diameter of described round flange is less than the long limit of described rectangle head and greater than the minor face of described rectangle head, described annular groove is arranged between described rectangle head and the described round flange, and described round flange below is a screw rod.For described special shaped screw bolt, the production technology of prior art is, earlier blank is processed into the shape of a big head and a bar portion that is attached thereto, then described head is processed the rectangle head earlier, reprocess out the annular groove that is connected with described rectangle head, reprocess out afterwards the round flange that is connected with annular groove, process screw thread in bar portion at last.The production technology of this machining needs turnning and milling to fall more blank owing to processing, so raw material availability is lower, and the manufacturing cost height, and, can not adapt to mass-produced needs because the required precision of machining makes production efficiency low.
Cold stamping is at room temperature a kind of, the mould that utilization is installed on the forcing press is exerted pressure to material, it is produced separates or plastic deformation, thereby obtain a kind of processing method of required part, have punching production rate height, stock utilization height, production precision advantages of higher, in batch process, obtained using widely.But, described special shaped screw bolt is difficult to control and hobs the degree of depth because the lip diameter of rectangle subfacies greater than the minor face of rectangle head, is produced as if employing cold-stamped mode during the scissor rectangle limit, damage flange easily, so the cold-stamped mode of production is unsuitable for producing described special shaped screw bolt.
Cold extrusion also is a kind of method of utilizing plastic deformation of metal to make the part of required form, be meant under cold conditions metal blank is put into mould cavity, under powerful pressure and certain velocity function, force metal from die cavity, to be extruded, thus the extrusion that obtains required form, size and have certain mechanical property.Cold extruding technique is a kind of vanguard technology technology of high-precision, efficient, high quality and low cost, and more application is in middle-size and small-size forging large-scale production.A kind of processing technology of high-strength bolt used for steel net frame bolt ball node is disclosed among the Chinese patent literature CN101549448A, adopting does not have machining less, comprising three cold extrusion shaped, hot-forging formings, promptly for the first time cold extrusion shaped is the screw rod moulding, for the second time cold extrusion shaped is thread segment moulding on the screw rod, cold extrusion shaped for the third time is thread forming, and hot-forging forming is the bolt moulding of begining to crop up.Cold extruding technique only is used for spiro rod section in the prior art, is hot-forging forming and bolt begins to crop up that moulding adopts, and forge hot is to process under the condition of the recrystallization temperature that is higher than the blank metal, is difficult to guarantee the characteristic of product during operation, its less stable.
Summary of the invention
For this reason, technical problem to be solved by this invention is that the production process of special shaped screw bolt described in the prior art is many, production cost is high, efficient is low, the problem of product stability difference, thereby proposes the cold extrusion production process of a kind of production efficiency height, production precision height, special shaped screw bolt that product stability is good.
For solving the problems of the technologies described above, special shaped screw bolt production technology of the present invention, a kind of production technology of special shaped screw bolt is characterized in that, comprises the steps:
1. according to the suitably big or small cylinder blank of required size intercepting;
2. cold extrusion for the first time, with an end of described blank cold extrusion shaped be base spiro rod section directly before the screw thread rolled thread;
3. cold extrusion for the second time, with the other end of described blank cold extrusion shaped be a preformed head, the diameter of the open end of described preformed head is less than the diameter of the end of the described preformed head that is connected with described spiro rod section, and described open end seamlessly transits to described end;
4. cold extrusion for the third time, with described preformed head cold extrusion shaped be two flanges that link to each other successively, the flange that links to each other with spiro rod section is required round flange, another flange that links to each other with described round flange is a flange to be processed, and the diameter of described flange to be processed is greater than the diameter of described round flange;
5. the 4th cold extrusion, with described flange to be processed cold extrusion shaped be required rectangle head, unnecessary blank is extruded between described rectangle head and the described round flange.
6. remove unnecessary blank, make the annular groove moulding;
7. the desired area at spiro rod section molds screw thread.
The production technology of special shaped screw bolt of the present invention also needs to promote the heat treatment process of properties of product after 7. in described step.
The production technology of special shaped screw bolt of the present invention, the diameter of the flange to be processed that described step forms in 4. and described step 5. in cornerwise length of described rectangle head of formation identical.
The production technology of special shaped screw bolt of the present invention, described flange to be processed are circular.
The production technology of special shaped screw bolt of the present invention, described step 2. or 3. or 4. or the cold extrusion 5. realize by multi-station cold former.
2. or 3. or 4. or the mould that cold extrusion is used 5. the production technology of special shaped screw bolt of the present invention, described multi-station cold former have four stations at least, described step are set respectively.
The production technology of special shaped screw bolt of the present invention uses precision meter lathe to come the unnecessary blank of turning in described step in 6..
The production technology of special shaped screw bolt of the present invention, described step 7. in, rub screw thread on the screw rod by automatic flat die thread-rolling machine.
The production technology of special shaped screw bolt of the present invention, described heat treatment is finished by the controlled atmosphere heat-treatment production line.
Technique scheme of the present invention has the following advantages compared to existing technology,
1) production technology of special shaped screw bolt of the present invention, by the rectangle head of four cold extrusions with described special shaped screw bolt, lower flange and spiro rod section moulding, and unnecessary blank is extruded between round flange and the rectangle head, waiting until turning falls, use cold extruding technique to produce described special shaped screw bolt, strengthened its stability, improved its production efficiency simultaneously, and only need be after the 4th cold extrusion in the production process the unnecessary blank of turning, the mode of production of the few cutting of this kind has improved utilization ratio of raw materials, reduce production cost when economizing in raw materials, be suitable for large-scale production.
2) production technology of special shaped screw bolt of the present invention, behind cold extrusion, turning and thread forming, also need to heat-treat, described heat treatment is finished by the controlled atmosphere heat-treatment production line, and heat treatment process can improve the intensity of product, and then promotes properties of product.
3) production technology of special shaped screw bolt of the present invention, the diameter of described flange to be processed is identical with cornerwise length of described rectangle head, produces the least possible unnecessary blank when having guaranteed the 5. middle extruding rectangle of described step head, has improved raw material availability.
4) production technology of special shaped screw bolt of the present invention, four cold extrusions realize by multi-station cold former, by four stations the required mould of cold extrusion is set four times, it is more convenient, quick that the cold extrusion mode is implemented, produce by using multi-station cold former, the output of the described special shaped screw bolt of per minute has improved production efficiency greater than 120 when guaranteeing product quality.
5) production technology of special shaped screw bolt of the present invention uses precision meter lathe to come the unnecessary blank of turning, is used with multi-station cold former, can realize the supply of material in enormous quantities.
Description of drawings
For the easier quilt of content of the present invention is clearly understood, below according to a particular embodiment of the invention and in conjunction with the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is the front view of described special shaped screw bolt;
Fig. 2 is the left view of described special shaped screw bolt;
Fig. 3 is the structural representation of the intermediate member that each step forms in the described special shaped screw bolt production process.
Reference numeral is expressed as among the figure: 1-rectangle head, 2-annular groove, 3-round flange, 4-spiro rod section, the preformed head of 5-, the open end of the preformed head of 51-, the end of the preformed head of 52-, 6-flange to be processed, the blank that 7-is unnecessary.
The specific embodiment
Fig. 1, Fig. 2 have provided the front view and the left view of special shaped screw bolt of the present invention, described as can be seen its head of special shaped screw bolt is a rectangle head 1, described rectangle head is provided with narrow annular groove 2 and round flange 3 for 1 time successively, the width of described annular groove 2 is about 2mm, described round flange 3 belows are spiro rod section 4, the diameter of described round flange 3 is less than the long limit of described rectangle head 1 and greater than the minor face of described rectangle head 1, described special shaped screw bolt is used to assemble the automobile license plate lamp plaque.Fig. 3 has provided the flow chart of the production technology of special shaped screw bolt of the present invention, comprises the steps:
1. according to the suitably big or small cylinder blank of required size intercepting, shown in (a) among Fig. 3;
2. cold extrusion for the first time, with an end of described blank cold extrusion shaped be base spiro rod section 4 directly before the screw thread rolled thread, shown in (b) among Fig. 3;
3. cold extrusion for the second time, with the other end of described blank cold extrusion shaped be a preformed head 5, the diameter of the open end 51 of described preformed head is less than the diameter of the end 52 of the described preformed head that is connected with described spiro rod section 4, and described open end 51 seamlessly transits to described terminal 52, shown in (c) among Fig. 3;
4. cold extrusion for the third time, with described preformed head 5 cold extrusion shaped be two flanges that link to each other successively, the flange that links to each other with spiro rod section is the round flange 3 after the described special shaped screw bolt moulding, another flange that links to each other with described round flange 3 is a flange 6 to be processed, described flange to be processed 6 also is circular, the diameter of described flange to be processed 6 is greater than the diameter of described round flange 3, shown in (d) among Fig. 3;
5. the 4th cold extrusion, with described flange to be processed 6 cold extrusion shaped be required rectangle head 1, unnecessary blank 7 is extruded between described rectangle head 1 and the described round flange 3, shown in (e) among Fig. 3;
6. remove unnecessary blank 7, shown in (e) dash area among Fig. 3, make annular groove 2 moulding;
7. the desired area at spiro rod section 4 molds screw thread.
In the present embodiment, 7. the heat treatment process that also needs to promote properties of product in step after, realize that by the controlled atmosphere heat-treatment production line heat treatment process comprises through the above-mentioned steps processed workpiece, improves its intensity by processes such as heating, quenching, tempering.Described step 2. or 3. or 4. or the cold extrusion 5. realize by multi-station cold former, described multi-station cold former model is CFB-84S, produce by Taiwan springtime company, be a kind of equipment with securing members such as cold-stamped mode processing bolts, at least have four stations, 2. or 3. or 4. or the mould that cold extrusion is used 5. described step is set respectively, can finishes four times above-mentioned cold extrusions automatically, the output of described multistation cold forming machine per minute is greater than 120.The diameter of the flange to be processed 6 that described step forms in 4. and described step 5. in cornerwise length of described rectangle head 1 of formation identical, shown in (f) among Fig. 3.6. the model that the precision meter lathe that uses in described step is produced as the Zhejiang Yuhuan is the lathe of CJ0625-A, is used for the unnecessary blank 7 of turning, forms a complete production network with described multi-station cold former, can realize the supply of material in enormous quantities.Described step 7. in, rub screw thread on the screw rod by automatic flat die thread-rolling machine.
Obviously, the foregoing description only is for example clearly is described, and is not the qualification to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all embodiments.And conspicuous variation of being extended out thus or change still are among the protection domain of the invention.
Claims (9)
1. the production technology of a special shaped screw bolt is characterized in that, comprises the steps:
1. according to the suitably big or small cylinder blank of required size intercepting;
2. cold extrusion for the first time, with an end of described blank cold extrusion shaped be base spiro rod section directly before the screw thread rolled thread;
3. cold extrusion for the second time, with the other end of described blank cold extrusion shaped be a preformed head, the diameter of the open end of described preformed head is less than the diameter of the end of the described preformed head that is connected with described spiro rod section, and described open end seamlessly transits to described end;
4. cold extrusion for the third time, with described preformed head cold extrusion shaped be two flanges that link to each other successively, the flange that links to each other with spiro rod section is required round flange, another flange that links to each other with described round flange is a flange to be processed, and the diameter of described flange to be processed is greater than the diameter of described round flange;
5. the 4th cold extrusion, with described flange to be processed cold extrusion shaped be required rectangle head, unnecessary blank is extruded between described rectangle head and the described round flange;
6. remove unnecessary blank, make the annular groove moulding that is connected with described rectangle head;
7. the desired area at spiro rod section molds screw thread.
2. the production technology of special shaped screw bolt according to claim 1 is characterized in that: the heat treatment process that also needs to promote properties of product in described step after 7..
3. the production technology of special shaped screw bolt according to claim 1 and 2 is characterized in that: the diameter of the flange to be processed that described step forms in 4. and described step 5. in cornerwise length of described rectangle head of formation identical.
4. the production technology of special shaped screw bolt according to claim 3 is characterized in that: described flange to be processed is for circular.
5. according to the production technology of claim 1 or 2 or 4 described special shaped screw bolts, it is characterized in that: described step 2. or 3. or 4. or the cold extrusion 5. realize by multi-station cold former.
2. or 3. or 4. or the mould that cold extrusion is used 5. 6. the production technology of special shaped screw bolt according to claim 5, it is characterized in that: described multi-station cold former has four stations at least, described step is set respectively.
7. according to the production technology of claim 1 or 2 or 4 or 6 described special shaped screw bolts, it is characterized in that: use precision meter lathe to come the unnecessary blank of turning in 6. in described step.
8. the production technology of special shaped screw bolt according to claim 7 is characterized in that: described step 7. in, rub screw thread on the spiro rod section by automatic flat die thread-rolling machine.
9. according to the production technology of claim 2 or 4 or 6 or 8 described special shaped screw bolts, it is characterized in that: described heat treatment is finished by the controlled atmosphere heat-treatment production line.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101417875A CN101780629B (en) | 2010-04-08 | 2010-04-08 | Production process of special shaped screw bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101417875A CN101780629B (en) | 2010-04-08 | 2010-04-08 | Production process of special shaped screw bolt |
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| CN101780629A CN101780629A (en) | 2010-07-21 |
| CN101780629B true CN101780629B (en) | 2011-04-27 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102225503B (en) * | 2011-04-02 | 2013-08-14 | 翁振栋 | Method and mould for manufacturing floor spring rotating shaft head |
| CN102284534A (en) * | 2011-07-25 | 2011-12-21 | 浙江捷能汽车零部件有限公司 | Cold-forming method for hexagon flange face bolt |
| CN102500732B (en) * | 2011-10-17 | 2013-11-06 | 浙江裕泰汽车配件有限公司 | Multi-station cold heading forming technology of automobile door limiter |
| CN103785992A (en) * | 2012-10-31 | 2014-05-14 | 常州市翰琪电机有限公司 | Air cylinder head bolt machining process |
| CN103056258B (en) * | 2012-12-19 | 2015-10-28 | 桂林福达全州高强度螺栓有限公司 | A kind of processing method of bolt thread |
| CN106956110A (en) * | 2017-04-21 | 2017-07-18 | 绵竹市凯瑞机械加工有限公司 | A kind of processing method of hexagon socket head cap screw |
| CN110102972A (en) * | 2019-04-30 | 2019-08-09 | 海盐猛凌汽车配件有限公司 | A kind of weld bolt processing technology |
| CN112846642A (en) * | 2019-11-12 | 2021-05-28 | 昆山市明开精密电子五金有限公司 | Machining process of special-shaped nut applied to electronic equipment |
| CN112792513A (en) * | 2021-01-19 | 2021-05-14 | 上海奥达科股份有限公司 | Production process and device for double-chamfer straight-tooth press-fitting bolt |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1115212C (en) * | 2001-11-09 | 2003-07-23 | 李庆永 | Process for processing square bar stud bolt |
| JP3546211B1 (en) * | 2003-03-24 | 2004-07-21 | 株式会社産学連携機構九州 | Bolt manufacturing method and manufacturing apparatus, screw rolling dies used therefor, and multiple screw bolts |
| EP1990552B1 (en) * | 2006-02-10 | 2013-10-02 | Mitsubishi Heavy Industries, Ltd. | Bolt and method for manufacturing bolt |
| CN1945030B (en) * | 2006-10-26 | 2010-09-01 | 贵州凯星液力传动机械有限公司 | Method for processing high accuracy high strength bolt |
| CN101003096A (en) * | 2007-01-12 | 2007-07-25 | 辽河石油勘探局 | Method for manufacturing trapeziform bolt |
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Owner name: ZHEJIANG YUTAI AUTOMOTIVE COMPONENTS CO., LTD. Free format text: FORMER OWNER: ZHEJIANG YUTAI FASTENING PIECE MANUFACTURING CO., LTD. Effective date: 20121212 |
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Free format text: CORRECT: ADDRESS; FROM: 325055 WENZHOU, ZHEJIANG PROVINCE TO: 325025 WENZHOU, ZHEJIANG PROVINCE |
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Effective date of registration: 20121212 Address after: 325025, Dingxiang Road, Binhai Park, Wenzhou economic and Technological Development Zone, Zhejiang, 608 Patentee after: Zhejiang Yutai Automobile Parts Co., Ltd. Address before: 325055 Haicheng second industrial zone, Longwan District, Zhejiang, Wenzhou Patentee before: Zhejiang Yutai Fastener Manufacturing Co., Ltd. |