CN102962376A - Opening-shrinking method for self-locking nut - Google Patents
Opening-shrinking method for self-locking nut Download PDFInfo
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- CN102962376A CN102962376A CN2012102541510A CN201210254151A CN102962376A CN 102962376 A CN102962376 A CN 102962376A CN 2012102541510 A CN2012102541510 A CN 2012102541510A CN 201210254151 A CN201210254151 A CN 201210254151A CN 102962376 A CN102962376 A CN 102962376A
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Abstract
The invention discloses an opening-shrinking method for a self-locking nut. The self-locking nut of which the strength ob sigma b is less than or equal to 1,100MPa is selected; after tapping, thermal treatment and surface treatment are performed on the self-locking nut; the opening of the first part is shrunk and locking performance is tested; the technical parameters of shrinking the opening are adjusted according to the test result; and the openings of the whole batch of self-locking nuts are shrunk. An opening-shrinking flow is changed, thermal treatment and surface treatment are performed on the whole batch of self-locking nuts, and an opening-shrinking test is performed, so that the consistency of equipment and mold adjusting parameters is ensured, and particularly, the inconsistency of thermal treatment and surface treatment after the opening-shrinking test is avoided. The consistency of various states is ensured and the lasting elasticity of the strength of the nuts after thermal treatment exists, so that the problem on the stability of locking torque is solved, and the period of the opening-shrinking test is also shortened. The method is applied to the self-locking nut of which the strength is less than or equal to 1,100MPa.
Description
Technical field
The present invention relates to the self-locking nut technical field, particularly relate to a kind of closing method of self-locking nut.
Background technology
The processing of the self-locking structure of Aeronautics and Astronautics securing member self-locking nut is owing to be subjected to the impact of material inconsistency can affect its locking property at present, therefore, every a collection of nut all will carry out initial workpiece (in small batches) closing in test before formal the closing in, nut through initial workpiece closing in test, verify first whether its locking property reaches standard, the result who closes up and test according to initial workpiece (in small batches) again revises the bottling technique parameter.Bottling technique generally carried out before heat treatment, main program is: by traditional bottling technique bottling technique parameter → (if necessary, again test and adjusting process) → close up by the gross tested → adjusted to initial workpiece (in small batches) closing in → heat treatment → locking property.But for a long time, there are a lot of drawbacks in this closing method, mainly be because this method test cycle long, there is inconsistency in the actual adjustment state that the heat treatment of closing in test, surface treatment, closing-in mould close up etc. with series-produced state, cause closing up by the gross and can't embody the requirement of the test of closing up, this must cause the locking torque after batch production unstable.In actual production, the locking torque that initial workpiece closing in test often can occur is very stable, and the unsettled situation of batch locking torque.Close up test and concrete actual requirement is generally all very high, as long as the error that occurs any one link in closing in, heat treatment, surface treatment all will affect the stability of batch locking torque, and batch produce when undesirable, often to reprocess through doing over again, greatly increase market cost, the delay production cycle of product.
Summary of the invention
Technical problem to be solved by this invention is the defective that locking torque is unstable, the production cycle is long that overcomes existing closing in test method, and the closing method of stable, the with short production cycle self-locking nut of a kind of locking torque is provided.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
The closing method of self-locking nut of the present invention: get intensity σ
bThe self-locking nut of≤1100MPa, heat-treat after the tapping and surface treatment, then carry out initial workpiece closing in and locking property test, adjust the bottling technique parameter according to result of the test, again close up and the locking property test, until the locking torque dispersion is screwed into 80%, the 15th 150% of minimum locking torque 〉=regulation of back-outing of maximum locking torque≤regulation for the 1st time, incite somebody to action afterwards by the gross self-locking nut crimping.
In the above-mentioned closing method, when carrying out the locking property test, take the principle that the screw thread radial-deformation is minimum, the closing in deformation length is the longest that closes up.Such principle guarantees to stablize with the 15th time locking torque for the 1st time so that when locking bolt test plug contacts to deformation plance fully with the self-locking nut threading path.
The material of aforementioned self-locking nut is carbon steel, steel alloy, high temperature alloy, aluminium alloy or copper alloy.
Preferably, the closing method of aforementioned self-locking nut, described bottling technique parameter is closing in radial diameter and closing in length.
The closing method of aforementioned self-locking nut, the adjustment standard of described bottling technique parameter are with the 15-25% of batch locking torque value in the 1st time and the 15th time moment values of standard-required, are preferably 20%.
Compared with prior art, the present invention has changed the closing in flow process, first to self-locking nut by the gross heat-treat with surface treatment after the test of closing up again, guaranteed the uniformity of equipment, die adjustment parameter, especially heat treatment, surface-treated inconsistency after closing in is tested have been avoided, owing to guaranteed the uniformity of various states, add the lasting elasticity of its intensity after the nut heat treatment, not only solved the stability problem of locking torque, also shortened the cycle of the test of closing up, the inventive method is suitable for intensity at the self-locking nut of 1100Mpa.
The specific embodiment
Get intensity σ
bThe self-locking nut of≤1100MPa, heat-treat after the tapping and surface treatment, then minimum according to closing in screw thread radial-deformation, the principle that the closing in deformation length is the longest is carried out initial workpiece closing in and locking property test, adjust the bottling technique parameter according to result of the test, bottling technique parameter mainly refer to close up radial diameter and closing in length, the adjustment standard of bottling technique parameter is with the 15-25% of batch locking torque value in the 1st time and the 15th time moment values of standard-required, be preferably 20%, again close up and the locking property test, until the locking torque dispersion is screwed into 80% of maximum locking torque≤regulation the 1st time, 150% of the minimum locking torque 〉=regulation of back-outing for the 15th time, afterwards self-locking nut crimping by the gross.The method test period is short, elder generation's initial workpiece (in small batches) examination is closed up, then carry out immediately the locking property test, adjusted the closing in dimensional parameters according to the locking property test situation and satisfied the locking property test, in case locking property agreement with experimental requirement, fix with the dimensional parameters that is about to close up, carry out a batch closing in.This closing in test method draw the great locking torque instability problem after traditional closing in test method that solved.
It is the self-locking nut of carbon steel (ML18, ML25), steel alloy (16CrSiNi, 30CrMnSiA) and high temperature alloy (GH2132), aluminium alloy, copper alloy that above method is fit to material.
According to traditional self-locking closing in test method, general each batch examination is closed up on-test, closing in → heat treatment → surface treatment → locking torque is tested the cycle of this process and is wanted about a week, if the large needs of locking torque dispersion of test carry out secondary closing in test first, this batch production life cycle got about 10 days at least.And according to closing in test method of the present invention, closing up, shortened the cycle of two procedures in the middle of the locking torque test, and with the heat treatment of batch product and the state consistency of surface-treated closing in testpieces and batch product, simultaneously Closing in die can keep closing up test and batch state consistency, reduced the error of mode transfer, guaranteed that three is unified, be heat treatment, surface treatment, the unification of closing in state, the closing in test period cycle of the inventive method generally only needs about half a day, production cycle with batch product has shortened a week at least, and the while also provides assurance for the uniformity of product quality.Because it is little that the principle of this closing in size is the deflection that radially closes up, increase closing in length as far as possible, guarantee to close up after the distortion when doing locking torque test plug and self-locking nut be screwed into revolve with after effective area that cooperates large, guarantee coefficient of friction in the locking torque friction test is large, and self-locking nut cooperates the elasticity of area to keep good.The product of model GB930-88, specification M8, material ML18, surface treatment Zincing passivation, heat treatment 36-39HRC for example, require to be screwed into maximum moment 4.903Nm the 1st time, the 15th the minimum moment 0.392Nm that back-outs, closing in size radial-deformation 0.2-0.25, closing in length is between 2 times of pitch to 3 times pitch, test locking torque value is screwed into the 15th minimum moment 0.52-0.65N that back-outs of maximum moment 3.92-4.23Nm at the 1st time respectively, batch locking torque is in its scope, and similar products are not enumerated one by one.The present invention has the advantage that the cycle is short, locking torque is stable for the self-locking nut series products provides good closing method, is worthy to be popularized.
Claims (6)
1. the closing method of a self-locking nut is characterized in that: get intensity σ
bThe self-locking nut of≤1100MPa, heat-treat after the tapping and surface treatment, then carry out initial workpiece closing in and locking property test, adjust the bottling technique parameter according to result of the test, again close up and the locking property test, until the locking torque dispersion is screwed into 80%, the 15th 150% of minimum locking torque 〉=regulation of back-outing of maximum locking torque≤regulation for the 1st time, incite somebody to action afterwards by the gross self-locking nut crimping.
2. according to the closing method of the described self-locking nut of claim 1, it is characterized in that: when carrying out the locking property test, take the principle that the screw thread radial-deformation is minimum, the closing in deformation length is the longest that closes up.
3. according to the closing method of the described self-locking nut of claim 1, it is characterized in that: the material of described self-locking nut is carbon steel, steel alloy, high temperature alloy, aluminium alloy or copper alloy.
4. according to the closing method of the described self-locking nut of claim 1, it is characterized in that: described bottling technique parameter is closing in radial diameter and closing in length.
5. according to the closing method of claim 1 or 4 described self-locking nuts, it is characterized in that: the adjustment standard of described bottling technique parameter is with the 15-25% of batch locking torque value in the 1st time and the 15th time moment values of standard-required.
6. according to the closing method of the described self-locking nut of claim 5, it is characterized in that: the adjustment standard of described bottling technique parameter is in 20% of the 1st time and the 15th time moment values of standard-required with batch locking torque value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210254151.0A CN102962376B (en) | 2012-07-23 | 2012-07-23 | A kind of closing method of self-locking nut |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210254151.0A CN102962376B (en) | 2012-07-23 | 2012-07-23 | A kind of closing method of self-locking nut |
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| Publication Number | Publication Date |
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| CN102962376A true CN102962376A (en) | 2013-03-13 |
| CN102962376B CN102962376B (en) | 2015-11-11 |
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| CN201210254151.0A Active CN102962376B (en) | 2012-07-23 | 2012-07-23 | A kind of closing method of self-locking nut |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105522070A (en) * | 2015-12-12 | 2016-04-27 | 中国航空工业标准件制造有限责任公司 | Shell nosing method of titanium alloy self-locking nuts |
| CN113798798A (en) * | 2021-09-30 | 2021-12-17 | 中国航空工业标准件制造有限责任公司 | Preparation method of high-temperature-resistant lock nut for commercial automobile |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB571927A (en) * | 1943-02-02 | 1945-09-14 | Allied Control Co | Improvements in the production of self-locking nuts |
| SU804895A1 (en) * | 1979-02-23 | 1981-02-15 | Komarnitskij Ivan A | Nut |
| CN101486047A (en) * | 2009-02-25 | 2009-07-22 | 沪东重机有限公司 | Method for producing whole metal self-locking nut |
| CN101905272A (en) * | 2010-07-12 | 2010-12-08 | 贵州大学 | Self-locking nut crimping processing method |
-
2012
- 2012-07-23 CN CN201210254151.0A patent/CN102962376B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB571927A (en) * | 1943-02-02 | 1945-09-14 | Allied Control Co | Improvements in the production of self-locking nuts |
| SU804895A1 (en) * | 1979-02-23 | 1981-02-15 | Komarnitskij Ivan A | Nut |
| CN101486047A (en) * | 2009-02-25 | 2009-07-22 | 沪东重机有限公司 | Method for producing whole metal self-locking nut |
| CN101905272A (en) * | 2010-07-12 | 2010-12-08 | 贵州大学 | Self-locking nut crimping processing method |
Non-Patent Citations (2)
| Title |
|---|
| 航空航天工业部第三O一研究所: "《GB943-88》", 31 October 1989 * |
| 金秀芳: "典型螺母加工工艺研究", 《航空精密制造技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105522070A (en) * | 2015-12-12 | 2016-04-27 | 中国航空工业标准件制造有限责任公司 | Shell nosing method of titanium alloy self-locking nuts |
| CN113798798A (en) * | 2021-09-30 | 2021-12-17 | 中国航空工业标准件制造有限责任公司 | Preparation method of high-temperature-resistant lock nut for commercial automobile |
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| Publication number | Publication date |
|---|---|
| CN102962376B (en) | 2015-11-11 |
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Inventor after: Yang Jiuxi Inventor after: Chen Xiaoxiao Inventor after: Wang Feng Inventor after: Zou Gang Inventor before: Yang Jiuxi Inventor before: Chen Xiaoxiao Inventor before: Wang Feng Inventor before: Zhou Gang |
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