CN102873503A - High anti-fatigue bolt and manufacturing method thereof - Google Patents
High anti-fatigue bolt and manufacturing method thereof Download PDFInfo
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- CN102873503A CN102873503A CN2011101933623A CN201110193362A CN102873503A CN 102873503 A CN102873503 A CN 102873503A CN 2011101933623 A CN2011101933623 A CN 2011101933623A CN 201110193362 A CN201110193362 A CN 201110193362A CN 102873503 A CN102873503 A CN 102873503A
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- thread
- thread segment
- changeover portion
- bolt
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Abstract
The invention discloses a manufacturing method of a high anti-fatigue bolt. The manufacturing method comprises the following steps: a bolt provided with a head part, a rod part and a thread section is machined by adopting a tampering forming method, when threads of the thread section are machined, firstly a transition section is machined on the rod part, and positioned between the thread section and the rod part, the maximum diameter of the transition section is smaller than the outer diameter of the thread of the thread section and the diameter of the rod part, threads with needed standard thread pitch are rolled on the thread section by adopting a thread rolling wheel, when the threads are rolled, ending threads at a position where the thread section and the transition section are connected are of incomplete threads, namely the thread pitch of the ending threads is smaller than or equal to half of the standard thread pitch on the thread section. The bolt has the advantages of being high in anti-fatigue strength, small in size and light in weight, and the manufacturing method has the advantages of being simple in technology, lower in manufacturing cost, fast to produce, high in working safety and reliability, convenient to both use and maintain and the like.
Description
Technical field
The present invention relates to a kind of high anti-fatigue bolt and preparation method thereof, belong to technical field of fastening.
Background technology
In the aerospace vehicle Element Design, the people of technical field of fastening all know, the high-performance securing member is very expensive, and its weight is a parameter of most critical.As saying " weight of the every extra 450g of increasing of aircraft just has been equivalent to increase by the operating cost in 1 year of aircraft " on some magazine; " make great efforts for alleviating each gram weight ".On aerospace vehicle, overweight all is undesirable.For reaching the purpose that alleviates bolt weight, often adopt the mode of as far as possible the bolt size being dwindled to alleviate the weight of bolt.But adopt existing common process method and existing bolt arrangement manufacturing fastener bolt out, under required size, often can not meet the demands aspect its fatigue resistance, because its fatigue resistance is relatively poor, often cause the flight safety coefficient of aerospace vehicle low high with maintenance cost.So existing bolt arrangement or preparation method or not ideal enough.
Summary of the invention
The object of the invention is to, provide a kind of in the situation that satisfy its size of fatigue resistance and high anti-fatigue bolt that weight is all less and preparation method thereof, to overcome the deficiencies in the prior art.
Technical scheme of the present invention is achieved in that the preparation method of a kind of high anti-fatigue bolt of the present invention is, the method comprises that the method that adopts upsetting to make type processes and has head, the bolt of bar section and thread segment, when making the screw thread of thread segment, first produce a changeover portion in bar section, changeover portion is arranged between thread segment and the bar section, and make the maximum gauge of changeover portion part less than major diameter of thread and the bar section diameter of thread segment, then adopt the screw thread cylindrical die roll to roll out the screw thread of required standard pitch at thread segment, when rolled thread, the ending screw thread that makes thread segment be connected part with changeover portion is incomplete thread, even the pitch of ending screw thread is less than or equal to 1/2 pitch of standard pitch on the thread segment.
When making changeover portion, the length of changeover portion is controlled on 1～3 times of thread segment in the standard pitch length scope, adopt rolling forging die to roll out the dome arc shaft shoulder, the little shaft shoulder of transition dome arc, transition concave arc, the protruding wave regions and the cylindrical neck portion that is connected with thread segment that is connected with bar section at changeover portion, the dome arc shaft shoulder, the little shaft shoulder of transition dome arc, transition concave arc, protruding wave regions are connected pass through mutually successively connection with cylindrical neck portion.
Above-mentioned employing screw thread cylindrical die roll is the MJ screw thread at the screw thread that thread segment rolls out required standard pitch.
Above-mentioned bolt is for adopting aluminium alloy 7075T73, titanium alloy 6Al-4V or corrosion-resisting steel A286 material to make.
Of the present invention a kind of high anti-fatigue bolt of making according to the method described above is: this bolt comprises the bolt that is provided with head, bar section and thread segment, between thread segment and bar section, be provided with changeover portion, and thread segment is connected part with changeover portion ending screw thread is incomplete thread, and namely the pitch of this ending screw thread is less than or equal to 1/2 pitch of standard pitch on the thread segment; Be provided with the dome arc shaft shoulder, the little shaft shoulder of transition dome arc, transition concave arc, the protruding wave regions and the cylindrical neck portion that is connected with thread segment that is connected with bar section at changeover portion, and the dome arc shaft shoulder, the little shaft shoulder of transition dome arc, transition concave arc, protruding wave regions are connected with cylindrical neck portion and are passed through mutually successively connection.
The body diameter of the cylindrical neck portion on above-mentioned changeover portion is greater than 0.2～5 millimeter of the core diameter of thread on the thread segment; The protruding ripple diameter of the protruding wave regions on the changeover portion greater than the body diameter of cylindrical neck portion less than the major diameter of thread on the thread segment.
On the front end face of thread segment or at the top end face of head, be provided with the polygon shrinkage pool.
The degree of depth of above-mentioned polygon shrinkage pool is less than or equal to three times of standard pitch on the thread segment; And the polygon shrinkage pool be shaped as square, regular hexagon, octagon or dodecagon.
The shape of the countersunk head type that is shaped as, coiled hair type, flat brachycephalic or the regular polygon of the head of above-mentioned bolt.
Owing to having adopted technique scheme, the present invention is set up at the bar position of conventional bolt has increased a changeover portion, because of the maximum gauge of this changeover portion less than the major diameter of thread of thread segment, more less than bar section diameter, so in the situation that the equal length bolt, its weight is lighter.In addition, the present invention is by arranging the dome arc shaft shoulder, the little shaft shoulder of transition dome arc, transition concave arc, protruding wave regions and cylindrical neck portion structure in changeover portion, the ending screw-tjread system of adding screw thread makes the incomplete thread that is less than or equal to 1/2 standard pitch, and all adopt the process of cold rolling to process the changeover portion and screw thread, through behind the cold rolling, on macroscopic view, can make material production work hardening, and on microcosmic, make the crystal grain of material be deformed into prolate shape by circle through roll extrusion power, increased its internal stress, made grain flow line more complete.This special construction of the present invention can make incomplete thread length reduce, and the length of the counterbore part of the nut that making simultaneously matches with it uses reduces, thereby reaches the purpose of weight and the minimized securing member of length.After above-mentioned a series of processing, the produced bolt toughness of the present invention has obtained very large enhancing, and has significantly strengthened the fatigue resistance of bolt.Through evidence, make the identical diameter of thread, identical bar section diameter and identical bolt length in the situation that adopt commaterial, the bolt that adopts the present invention to make is higher 2～3 times than the fatigue resistance of the bolt that adopts traditional approach to make, and it is light by 1/5～1/4 that its weight is wanted.Therefore, the present invention compared with prior art, the present invention has not only that fatigue resistance is high, size is little, lightweight advantage, technique is simple, cost of manufacture is lower, produce the advantages such as quick, safe and reliable property is high, working service all makes things convenient for but also have.The produced bolt of the present invention is particularly suitable for requiring that bolt length and minimize weight, fatigue resistance are high, use in the complex environment system of stable work in work.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the local structure for amplifying schematic diagram of changeover portion.
Being labeled as in the accompanying drawing: 1-head, 2-bar section, 3-changeover portion, the 3.1-dome arc shaft shoulder, 3.2-the little shaft shoulder of transition dome arc, 3.3-transition concave arc, the protruding wave regions of 3.4-, 3.5-cylindrical neck portion, 4-thread segment, the 4.1-screw thread that finishes up, 5-polygon shrinkage pool.
The specific embodiment
The present invention is described in further detail below in conjunction with drawings and Examples, but not as any limitation of the invention foundation.
Embodiments of the invention: when making a kind of high anti-fatigue bolt of the present invention, can adopt existing aluminium alloy 7075T73, titanium alloy 6Al-4V or corrosion-resisting steel A286 material are made, the method that adopts first existing upsetting to make type processes has head 1, the bolt semi-finished product of bar section 2 and thread segment 4, then produce a changeover portion 3 in bar section 2, changeover portion 3 is arranged between thread segment 4 and the bar section 2, and make the maximum gauge of changeover portion 3 parts less than major diameter of thread and bar section 2 diameters of thread segment 4, then adopt the screw thread cylindrical die roll to roll out the screw thread (standard pitch of screw thread can be determined routinely according to the requirement of using on the thread segment 4) of required standard pitch at thread segment 4, in order to reach better intensity, its screw thread preferably is made into MJ screw thread (being existing metric system Aero-Space screw thread); When rolled thread, the ending screw thread 4.1 that makes thread segment 4 be connected part with changeover portion 3 is incomplete thread, even the pitch of ending screw thread 4.1 is less than or equal to 1/2 pitch of standard pitch on the thread segment 4; When making changeover portion 3, the length of changeover portion 3 is controlled in the length range of standard pitch on 1～3 times of thread segment 4, then adopt the mode of rolling forging die to roll out the little shaft shoulder 3.2 of the dome arc shaft shoulder 3.1, transition dome arc, transition concave arc 3.3, protruding wave regions 3.4 and the cylindrical neck portion 3.5 that is connected with thread segment 4 that is connected with bar section 2 at changeover portion 3, and the dome arc shaft shoulder 3.1, the little shaft shoulder 3.2 of transition dome arc, transition concave arc 3.3, protruding wave regions 3.4 are connected with cylindrical neck portion pass through mutually successively each other connection; In order to make the weight of bolt lighter in the situation that satisfy intensity, the body diameter of the cylindrical neck portion 3.5 on the changeover portion 3 can be made into greater than 0.2～5 millimeter of the core diameter of thread on the thread segment 4; The protruding ripple diameter of the protruding wave regions 3.4 on the changeover portion 3 is made into greater than the body diameter of cylindrical neck portion 3.5 less than the major diameter of thread on the thread segment 4; In order to be convenient in use assembling-disassembling bolt, and more effectively alleviate bolt weight, can be according to the needs that use, on the front end face of thread segment 4 or at the top end face of head 1, produce a polygon shrinkage pool 5, during making, the degree of depth of this polygon shrinkage pool 5 can be made into three times that are less than or equal to standard pitch on the thread segment 4, and the shape of polygon shrinkage pool 5 is made into square, regular hexagon, octagon or dodecagon (concrete shape can be determined according to the needs that use, generally be regular hexagon); The shape of the head 1 of its bolt can be according to the needs that use, and the shape that is made into traditional countersunk head type, coiled hair type, flat brachycephalic or regular polygon gets final product.
Claims (9)
1. the preparation method of a high anti-fatigue bolt, comprise that the method that adopts upsetting to make type processes and has head (1), the bolt of bar section (2) and thread segment (4), it is characterized in that: when making the screw thread of thread segment (4), first produce a changeover portion (3) in bar section (2), changeover portion (3) is arranged between thread segment (4) and the bar section (2), and make the maximum gauge of changeover portion (3) part less than major diameter of thread and bar section (2) diameter of thread segment (4), then adopt the screw thread cylindrical die roll to roll out the screw thread of required standard pitch at thread segment (4), when rolled thread, the ending screw thread (4.1) that makes thread segment (4) be connected part with changeover portion (3) is incomplete thread, even the pitch of ending screw thread (4.1) is less than or equal to 1/2 pitch of the upper standard pitch of thread segment (4).
2. the preparation method of high anti-fatigue bolt according to claim 1, it is characterized in that: when making changeover portion (3), the length of changeover portion (3) is controlled in the standard pitch length range on 1～3 times of thread segment (4), adopt rolling forging die to roll out the dome arc shaft shoulder (3.1) that is connected with bar section (2) at changeover portion (3), the little shaft shoulder of transition dome arc (3.2), transition concave arc (3.3), protruding wave regions (3.4) and the cylindrical neck portion (3.5) that is connected with thread segment (4), and make the dome arc shaft shoulder (3.1), the little shaft shoulder of transition dome arc (3.2), transition concave arc (3.3), protruding wave regions (3.4) is connected 3.5 with cylindrical neck portion) pass through mutually successively each other connection.
3. the preparation method of high anti-fatigue bolt according to claim 1 is characterized in that: adopting the screw thread cylindrical die roll is the MJ screw thread at the screw thread that thread segment (4) rolls out required standard pitch.
4. the preparation method of high anti-fatigue bolt according to claim 1 is characterized in that: described bolt is for adopting aluminium alloy 7075T73, titanium alloy 6Al-4V or corrosion-resisting steel A286 material to make.
5. high anti-fatigue bolt, comprise the bolt that is provided with head (1), bar section (2) and thread segment (4), it is characterized in that: between thread segment (4) and bar section (2), be provided with changeover portion (3), and thread segment (4) is connected part with changeover portion (3) ending screw thread (4.1) is incomplete thread, and namely the pitch of this ending screw thread (4.1) is less than or equal to 1/2 pitch of the upper standard pitch of thread segment (4); Be provided with the dome arc shaft shoulder (3.1), the little shaft shoulder of transition dome arc (3.2), transition concave arc (3.3), protruding wave regions (3.4) and the cylindrical neck portion (3.5) that is connected with thread segment (4) that is connected with bar section (2) at changeover portion (3), and the dome arc shaft shoulder (3.1), the little shaft shoulder of transition dome arc (3.2), transition concave arc (3.3), protruding wave regions (3.4) are connected 3.5 with cylindrical neck portion) pass through mutually successively each other connection.
6. high anti-fatigue bolt according to claim 5, it is characterized in that: the body diameter of the cylindrical neck portion (3.5) on the changeover portion (3) is greater than 0.2～5 millimeter of the core diameter of thread on the thread segment (4); The protruding ripple diameter of the protruding wave regions (3.4) on the changeover portion (3) greater than the body diameter of cylindrical neck portion (3.5) less than the major diameter of thread on the thread segment (4).
7. high anti-fatigue bolt according to claim 5 is characterized in that: be provided with polygon shrinkage pool (5) on the front end face of thread segment (4) or at the top end face of head (1).
8. high anti-fatigue bolt according to claim 7 is characterized in that: the degree of depth of polygon shrinkage pool (5) is less than or equal to three times of the upper standard pitch of thread segment (4); And polygon shrinkage pool (5) be shaped as square, regular hexagon, octagon or dodecagon.
9. high anti-fatigue bolt according to claim 5 is characterized in that: the shape of the countersunk head type that is shaped as, coiled hair type, flat brachycephalic or the regular polygon of the head of bolt (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110193362.3A CN102873503B (en) | 2011-07-12 | 2011-07-12 | High anti-fatigue bolt and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110193362.3A CN102873503B (en) | 2011-07-12 | 2011-07-12 | High anti-fatigue bolt and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102873503A true CN102873503A (en) | 2013-01-16 |
| CN102873503B CN102873503B (en) | 2015-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110193362.3A Active CN102873503B (en) | 2011-07-12 | 2011-07-12 | High anti-fatigue bolt and manufacturing method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103967906A (en) * | 2013-01-29 | 2014-08-06 | 中国航空工业集团公司西安飞机设计研究所 | Super-strength MJ-thread alloy steel bolt |
| CN105673659A (en) * | 2016-04-22 | 2016-06-15 | 贵州航天精工制造有限公司 | Front bolt for bearing pedestal |
| CN106736287A (en) * | 2016-12-25 | 2017-05-31 | 重庆岷龙机械制造有限公司 | A kind of manufacture method of anti-backing type bolt |
| CN108561325A (en) * | 2018-05-11 | 2018-09-21 | 德清恒鑫电子有限公司 | A kind of anti-dropout threaded shaft for small-sized fans |
| CN109737131A (en) * | 2019-03-04 | 2019-05-10 | 贵州航天精工制造有限公司 | A kind of self-locking screw component and preparation method thereof |
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| CN1129292A (en) * | 1994-12-17 | 1996-08-21 | 阿图尔-费希尔股份公司费希尔厂 | Method for the manufacture of an expansible anchor consisting of corrosion-resistant steel |
| CN1398325A (en) * | 1998-10-29 | 2003-02-19 | 赫克国际公司 | Lightweight threaded fastener and thread rolling die |
| CN201535302U (en) * | 2009-04-03 | 2010-07-28 | 孙中强 | Bolt combination with double threads |
| CN101922495A (en) * | 2009-06-11 | 2010-12-22 | 深圳市大富科技股份有限公司 | Screw device and cavity filter using same |
| CN202140397U (en) * | 2011-07-12 | 2012-02-08 | 航天精工有限公司 | High anti-fatigue bolt |
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2011
- 2011-07-12 CN CN201110193362.3A patent/CN102873503B/en active Active
Patent Citations (5)
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| CN1129292A (en) * | 1994-12-17 | 1996-08-21 | 阿图尔-费希尔股份公司费希尔厂 | Method for the manufacture of an expansible anchor consisting of corrosion-resistant steel |
| CN1398325A (en) * | 1998-10-29 | 2003-02-19 | 赫克国际公司 | Lightweight threaded fastener and thread rolling die |
| CN201535302U (en) * | 2009-04-03 | 2010-07-28 | 孙中强 | Bolt combination with double threads |
| CN101922495A (en) * | 2009-06-11 | 2010-12-22 | 深圳市大富科技股份有限公司 | Screw device and cavity filter using same |
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Non-Patent Citations (1)
| Title |
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| 中国航天工业总公司: "MJ螺纹钛合金小沉头紧公差高锁螺栓", 《中国航天工业总公司航天工业行业标准》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103967906A (en) * | 2013-01-29 | 2014-08-06 | 中国航空工业集团公司西安飞机设计研究所 | Super-strength MJ-thread alloy steel bolt |
| CN105673659A (en) * | 2016-04-22 | 2016-06-15 | 贵州航天精工制造有限公司 | Front bolt for bearing pedestal |
| CN106736287A (en) * | 2016-12-25 | 2017-05-31 | 重庆岷龙机械制造有限公司 | A kind of manufacture method of anti-backing type bolt |
| CN106736287B (en) * | 2016-12-25 | 2018-09-21 | 重庆岷龙机械制造有限公司 | A kind of manufacturing method of anti-backing type bolt |
| CN108561325A (en) * | 2018-05-11 | 2018-09-21 | 德清恒鑫电子有限公司 | A kind of anti-dropout threaded shaft for small-sized fans |
| CN109737131A (en) * | 2019-03-04 | 2019-05-10 | 贵州航天精工制造有限公司 | A kind of self-locking screw component and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102873503B (en) | 2015-03-18 |
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Address after: 300000 Tianjin city Dongli District Yao Liu Qiao Xiang Bridge Industrial Park Road billion Patentee after: Aerospace Precision Products Co., Ltd. Address before: 300000 Tianjin city Dongli District Yao Liu Qiao Xiang Bridge Industrial Park Road billion Patentee before: Aerospace Fine Co., Ltd. |