CN102873503B - High anti-fatigue bolt and manufacturing method thereof - Google Patents
High anti-fatigue bolt and manufacturing method thereof Download PDFInfo
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- CN102873503B CN102873503B CN201110193362.3A CN201110193362A CN102873503B CN 102873503 B CN102873503 B CN 102873503B CN 201110193362 A CN201110193362 A CN 201110193362A CN 102873503 B CN102873503 B CN 102873503B
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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 aerospace vehicle Element Design, the people of technical field of fastening all know, high-performance securing member is very expensive, and its weight is a parameter of most critical.As some magazine said " aircraft often additionally increases the weight of 450g, is just equivalent to add the aircraft operating cost of 1 year "; " make great efforts for alleviating each gram weight ".On aerospace vehicle, overweight is all undesirable.For reaching the object alleviating bolt weight, often adopt the mode as far as possible reduced by Bolt sizes to alleviate the weight of bolt.But adopt fastener bolt out manufactured by existing common processing methods and existing bolt arrangement, often can not meet the demands in its fatigue resistance under required size, because its fatigue resistance is poor, often cause the flight safety coefficient of aerospace vehicle low high with maintenance cost.Therefore existing bolt arrangement or preparation method or not ideal enough.
Summary of the invention
the object of the invention is to, providing a kind of high anti-fatigue bolt that its size and weight are all less when meeting fatigue resistance 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 the method adopting upsetting to make type and processes and have head, the bolt of bar portion and thread segment, when making the screw thread of thread segment, first in bar portion, produce a changeover portion, changeover portion is made to be arranged between thread segment and bar portion, and make the maximum gauge of changeover portion part be less than major diameter of thread and the bar portion diameter of thread segment, then adopt screw thread cylindrical die roll on thread segment, roll out the screw thread of required standard pitch, when rolled thread, the ending screw thread making thread segment be connected part with changeover portion is incomplete thread, even if the pitch of ending screw thread is less than or equal to 1/2 pitch of standard pitch on thread segment.
when making changeover portion, by the cut to lengthen of changeover portion on 1 ~ 3 times of thread segment within the scope of standard pitch length, the convex arch shaft shoulder, the little shaft shoulder of transition convex arch, transition concave arc, convex wave regions and the cylindrical neck portion that is connected with thread segment that adopt rolling forging die to roll out on changeover portion to be connected with bar portion, make the convex arch shaft shoulder, the little shaft shoulder of transition convex arch, transition concave arc, convex wave regions and cylindrical neck portion pass through connection each other successively mutually.
the screw thread that above-mentioned employing screw thread cylindrical die roll rolls out required standard pitch on thread segment is MJ screw thread.
above-mentioned bolt makes for adopting aluminium alloy 7075T73, titanium alloy 6Al-4V or corrosion-resisting steel A286 material.
the of the present invention a kind of high anti-fatigue bolt made according to the method described above is: this bolt comprises the bolt being provided with head, bar portion and thread segment, changeover portion is provided with between thread segment and bar portion, and thread segment is connected part ending screw thread with changeover portion 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 thread segment; Changeover portion is provided with the convex arch shaft shoulder, the little shaft shoulder of transition convex arch, transition concave arc, convex wave regions and the cylindrical neck portion that is connected with thread segment that are connected with bar portion, and the convex arch shaft shoulder, the little shaft shoulder of transition convex arch, transition concave arc, convex wave regions pass through connection each other successively mutually with cylindrical neck portion.
the body diameter of the cylindrical neck portion on above-mentioned changeover portion is greater than the core diameter of thread 0.2 ~ 5 millimeter on thread segment; The convex ripple diameter of the convex wave regions on changeover portion is greater than the body diameter of cylindrical neck portion and the major diameter of thread be less than on thread segment.
polygon shrinkage pool is provided with on the front end face of thread segment or on the top end face of head.
the degree of depth of above-mentioned polygon shrinkage pool is less than or equal to three times of standard pitch on thread segment; And the shape of polygon shrinkage pool is square, regular hexagon, octagon or dodecagon.
the shape of the head of above-mentioned bolt is the shape of countersunk head type, coiled hair type, flat brachycephalic or regular polygon.
owing to have employed technique scheme, the present invention adds a changeover portion in the bar position of conventional bolt, maximum gauge because of this changeover portion be less than thread segment major diameter of thread, be more less than bar portion diameter, so when equal length bolt, its weight is lighter.In addition, the present invention by arranging the convex arch shaft shoulder, the little shaft shoulder of transition convex arch, transition concave arc, convex wave regions and cylindrical neck portion structure in changeover portion, add and the ending screw-tjread system of screw thread is made the incomplete thread being less than or equal to 1/2 standard pitch, and all adopt the process of cold rolling to process changeover portion and screw thread, after cold rolling, work hardening is produced material macroscopically can be made, and on microcosmic, the crystal grain of material is made to be deformed into prolate shape by circle through roll extrusion power, add its internal stress, make grain flow line more complete.This special construction of the present invention can make incomplete thread length reduce, and the length of the hole section of the nut used that simultaneously makes to match with it reduces, thus reaches the object of weight and the minimized securing member of length.After above-mentioned a series of process, the bolt toughness produced by the present invention obtains very large enhancing, and significantly enhances the fatigue resistance of bolt.Prove through test, when adopting commaterial to make the identical diameter of thread, identical bar portion diameter with identical bolt length, the bolt adopting the present invention to make is higher 2 ~ 3 times than the fatigue resistance of the bolt adopting traditional approach to make, and its weight wants light by 1/5 ~ 1/4.Therefore, compared with prior art, the present invention not only has that fatigue resistance is high, size is little, lightweight advantage in the present invention, but also has that technique is simple, cost of manufacture is lower, produce the advantages such as quick, safe and reliable property is high, working service all facilitates.Bolt produced by 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.
Accompanying drawing explanation
fig. 1 is structural representation of the present invention;
fig. 2 is the partial enlargement structural representation of changeover portion.
being labeled as in accompanying drawing: 1-head, 2-bar portion, 3-changeover portion, the 3.1-convex arch shaft shoulder, the little shaft shoulder of 3.2-transition convex arch, 3.3-transition concave arc, the convex wave regions of 3.4-, 3.5-cylindrical neck portion, 4-thread segment, 4.1-finishes up screw thread, 5-polygon shrinkage pool.
Detailed description of the invention
below in conjunction with drawings and Examples, the present invention is described in further detail, 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, existing aluminium alloy 7075T73 can be adopted, titanium alloy 6Al-4V or corrosion-resisting steel A286 material make, the method first adopting existing upsetting to make type processes has head 1, the bolt semi-finished product of bar portion 2 and thread segment 4, then in bar portion 2, a changeover portion 3 is produced, changeover portion 3 is made to be arranged between thread segment 4 and bar portion 2, and make the maximum gauge of changeover portion 3 part be less than major diameter of thread and bar portion 2 diameter of thread segment 4, then adopt screw thread cylindrical die roll on thread segment 4, roll out the screw thread (on thread segment 4, the standard pitch of screw thread can be determined routinely according to the requirement used) of required standard pitch, in order to reach better intensity, its screw thread is preferably made into MJ screw thread (i.e. existing metric system Aero-Space screw thread), when rolled thread, the ending screw thread 4.1 making thread segment 4 be connected part with changeover portion 3 is incomplete thread, even if the pitch of ending screw thread 4.1 is less than or equal to 1/2 pitch of standard pitch on thread segment 4, when making changeover portion 3, by in the length range of the cut to lengthen of changeover portion 3 standard pitch on 1 ~ 3 times of thread segment 4, then the convex arch shaft shoulder 3.1 adopting the mode of rolling forging die to roll out on changeover portion 3 to be connected with bar portion 2, the little shaft shoulder of transition convex arch 3.2, transition concave arc 3.3, convex wave regions 3.4 and the cylindrical neck portion 3.5 be connected with thread segment 4, and make the convex arch shaft shoulder 3.1, the little shaft shoulder of transition convex arch 3.2, transition concave arc 3.3, convex wave regions 3.4 pass through connection mutually successively each other with cylindrical neck portion 3.5, in order to make the weight of bolt lighter when meeting intensity, the body diameter of the cylindrical neck portion 3.5 on changeover portion 3 can be made into the core diameter of thread 0.2 ~ 5 millimeter be greater than on thread segment 4, the convex ripple diameter of the convex wave regions 3.4 on changeover portion 3 is made into the body diameter being greater than cylindrical neck portion 3.5 and the major diameter of thread be less than on thread segment 4, in order to be convenient to assembling-disassembling bolt in use, and more effectively alleviate bolt weight, can according to the needs used, a polygon shrinkage pool 5 is produced on the front end face of thread segment 4 or on the top end face of head 1, 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 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 used, and is regular hexagon under normal circumstances), the shape of the head 1 of its bolt according to the needs used, can be made into the shape of traditional countersunk head type, coiled hair type, flat brachycephalic or regular polygon.
Claims (8)
1. the preparation method of a high anti-fatigue bolt, comprise the method adopting upsetting to make type to process there is head (1), the bolt of bar portion (2) and thread segment (4), it is characterized in that: when making the screw thread of thread segment (4), first on bar portion (2), produce a changeover portion (3), changeover portion (3) is made to be arranged between thread segment (4) and bar portion (2), and make the maximum gauge of changeover portion (3) part be less than major diameter of thread and bar portion (2) diameter of thread segment (4), then adopt screw thread cylindrical die roll on thread segment (4), roll out the screw thread of required standard pitch, when rolled thread, the ending screw thread (4.1) making thread segment (4) be connected part with changeover portion (3) is incomplete thread, even if 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), when making changeover portion (3), by in the standard pitch length range of the cut to lengthen of changeover portion (3) on 1 ~ 3 times of thread segment (4), adopt rolling forging die on changeover portion (3), roll out the convex arch shaft shoulder (3.1) be connected with bar portion (2), the little shaft shoulder of transition convex arch (3.2), transition concave arc (3.3), convex wave regions (3.4) and the cylindrical neck portion (3.5) be connected with thread segment (4), and make the convex arch shaft shoulder (3.1), the little shaft shoulder of transition convex arch (3.2), transition concave arc (3.3), convex wave regions (3.4) and cylindrical neck portion (3.5) to pass through connection each other successively mutually.
2. the preparation method of high anti-fatigue bolt according to claim 1, is characterized in that: the screw thread adopting screw thread cylindrical die roll to roll out required standard pitch on thread segment (4) is MJ screw thread.
3. the preparation method of high anti-fatigue bolt according to claim 1, is characterized in that: described bolt makes for adopting aluminium alloy 7075T73, titanium alloy 6Al-4V or corrosion-resisting steel A286 material.
4. a high anti-fatigue bolt, comprise the bolt being provided with head (1), bar portion (2) and thread segment (4), it is characterized in that: between thread segment (4) and bar portion (2), be provided with changeover portion (3), and thread segment (4) is connected part ending screw thread (4.1) with changeover portion (3) is incomplete thread, 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); Changeover portion (3) is provided with the convex arch shaft shoulder (3.1), the little shaft shoulder of transition convex arch (3.2), transition concave arc (3.3), convex wave regions (3.4) and the cylindrical neck portion (3.5) that is connected with thread segment (4) that are connected with bar portion (2), and the convex arch shaft shoulder (3.1), the little shaft shoulder of transition convex arch (3.2), transition concave arc (3.3), convex wave regions (3.4) pass through connection each other successively mutually with cylindrical neck portion (3.5).
5. high anti-fatigue bolt according to claim 4, is characterized in that: the body diameter of the cylindrical neck portion (3.5) on changeover portion (3) is greater than the core diameter of thread 0.2 ~ 5 millimeter on thread segment (4); The convex ripple diameter of the convex wave regions (3.4) on changeover portion (3) is greater than the body diameter of cylindrical neck portion (3.5) and the major diameter of thread be less than on thread segment (4).
6. high anti-fatigue bolt according to claim 4, is characterized in that: on the front end face of thread segment (4) or on the top end face of head (1), be provided with polygon shrinkage pool (5).
7. high anti-fatigue bolt according to claim 6, 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 the shape of polygon shrinkage pool (5) is square, regular hexagon, octagon or dodecagon.
8. high anti-fatigue bolt according to claim 4, is characterized in that: the shape of the head (1) of bolt is the shape of countersunk head type, coiled hair type, flat brachycephalic or regular polygon.
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 |
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| Publication Number | Publication Date |
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| CN102873503A CN102873503A (en) | 2013-01-16 |
| CN102873503B true 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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Families Citing this family (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 |
| 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 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE4445154A1 (en) * | 1994-12-17 | 1996-06-20 | Fischer Artur Werke Gmbh | Process for producing an expansion anchor made of corrosion-resistant steel |
| US6149363A (en) * | 1998-10-29 | 2000-11-21 | Huck International, Inc. | Lightweight threaded fastener and thread rolling die |
| CN201535302U (en) * | 2009-04-03 | 2010-07-28 | 孙中强 | Bolt combination with double threads |
| CN101922495B (en) * | 2009-06-11 | 2012-03-14 | 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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| CN102873503A (en) | 2013-01-16 |
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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. |