CN105673662A - Anti-disengagement process used for threaded connection - Google Patents
Anti-disengagement process used for threaded connection Download PDFInfo
- Publication number
- CN105673662A CN105673662A CN201610232294.XA CN201610232294A CN105673662A CN 105673662 A CN105673662 A CN 105673662A CN 201610232294 A CN201610232294 A CN 201610232294A CN 105673662 A CN105673662 A CN 105673662A
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- temperature
- threaded connection
- heated
- piece
- threaded
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000008569 process Effects 0.000 title claims abstract description 13
- 230000004069 differentiation Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 6
- 239000007769 metal material Substances 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000000704 physical effect Effects 0.000 abstract 1
- 241000239290 Araneae Species 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
Abstract
The invention relates to an anti-disengagement process used for threaded connection. The anti-disengagement process includes the process steps that A, a threaded connection piece with the nominal diameters or/and leads of an external thread and an internal thread being different is manufactured; B, the matching piece, with the smaller nominal diameter or/and the lead, in the threaded connection piece is heated to the temperature at which the matching piece is matched with the other matching piece in threaded connection after expanding; C, the matching piece heated in the process B is combined with the other matching piece in the threaded connection piece in a rotating mode, the rotating torque of a spanner is kept for a certain period of time after pretightening and is not kept after the temperature of the heated matching piece is decreased. The physical property that metal materials expand when heated and shrink when cooled is used, the connected threaded connection piece is not prone to disengagement even under the condition that external force and temperature condition changes are large, the anti-disengagement effect is good, and reliability is high.
Description
Technical field
The present invention relates to a kind of for threaded locking technique, be mainly used in the threaded locking of important plant equipment alternate load or the multiple position of dither.
Background technology
Threaded is a kind of dismountable fixing connection, has simple in construction, connects the advantages such as reliable, mounting or dismounting are convenient, is widely used in mechanical engineering, structure connection area. Threaded generally have self-locking performance, and the frictional force on the supporting surface of nut and bolt head also has locking effect in addition, therefore generally will not get loose after tightening. But under shock and vibration or varying load effect, and when high temperature or variations in temperature are bigger, the frictional force between screw thread can reduce or disappear moment, couples it is possible to loosen. Though traditional machinery is locking certain effect, but its reliability is relatively low, is not suitable for the occasion that requirement is higher.
Summary of the invention
It is an object of the invention to overcome the defect of above-mentioned prior art, it is provided that even if a kind of being also not easy when external force and temperature conditions change greatly gets loose, anti-loosing effect is good, what reliability was high is used for threaded locking technique.
The technical scheme taked for achieving the above object is:
A kind of for threaded locking technique, it is characterised in that to comprise the technical steps that:
A, make internal and external threads nominal diameter or/and helical pitch has the threaded connector of differentiation;
B, by nominal diameter in threaded connector or/and the less counterpart of helical pitch is heated to the temperature agreed with mutually after it can be made to expand with another counterpart in threaded connector;
C, B process is heated after gained counterpart and threaded connector in another counterpart screw, make the clamp load torque of spanner keep certain time after pretension, counterpart temperature to be heated stops after reducing again.
In described B process, heating-up temperature depends on the difference of internal and external threads nominal diameter or helical pitch.
In described B process, heating-up temperature has surplus.
Contrary operation according to the method described above is incited somebody to action when dismantling above-mentioned threaded connector.
The physical attribute that the present invention is expanded with heat and contract with cold mainly by metal material, cleverly the helical pitch of two components of composition screw thread pair is artificially designed to there is a less difference, and by the component that helical pitch is less is heated, when making the helical pitch thermal expansion of this component to the helical pitch value of another component, screw to connect connected piece by two components, after the temperature of heated component reduces, himself there is the trend that helical pitch is punctured into initial value, but this trend is limited by another component, thus creating a sizable compressive stress on the faying face of the screw thread pair of two component compositions, existence due to this power, no matter how connected position vibrates, how temperature raises, as long as screw thread pair is not destroyed, this connection would not loosen.
Accompanying drawing explanation
Fig. 1 is the locking process principle figure that the present invention is threaded, in figure 1, upper spider; 2, lower bearing bracket; 3, bolt; 4, nut; P, bolt helical pitch; δ, screw thread pair helical pitch are poor; P+ δ, nut helical pitch.
Detailed description of the invention
The present invention for the processing step of threaded locking technique is:
A, make internal and external threads nominal diameter or/and helical pitch has the threaded connector of differentiation, its magnitude of deviation depends on the height of locking requirement, and locking requirement is more high, and difference is more big;
B, by nominal diameter in threaded connector or/and the less counterpart of helical pitch is heated to the temperature agreed with mutually after it can be made to expand with another counterpart in threaded connector; It is mainly by making the characteristic of expanding with heat and contract with cold of metal material used by threaded connector. This heating-up temperature is similarly dependent on internal and external threads nominal diameter or the difference of helical pitch (or both are simultaneously), the more big heating-up temperature of difference more high (heating-up temperature must have certain surplus, for the compensation of temperature loss in operating process).
C, B process is heated after gained counterpart and threaded connector in another counterpart screw, make the clamp load torque of spanner keep certain time after pretension, counterpart temperature to be heated stops after reducing again.
In order to the present invention is more clearly described, be threaded to example with the bolts and nuts shown in Fig. 1: upper spider 1 and lower bearing bracket 2 be bolted 3 and nut 4 be fastenedly connected with the form of screw thread pair, leading of bolt 3 becomes P, leading of nut 4 becomes P+ δ, under normal temperature and pressure, bolt 3 and nut 4 can not normally screw and form screw thread pair, but by the threaded portion of bolt is heated so that when its helical pitch thermal stretching is to P+ δ, bolt 3 just can complete with nut 4 to coordinate, it is achieved threaded. After the temperature of bolt 3 declines, its helical pitch will strive to shrink to initial value P, but the existence due to nut 4, this contraction can be prevented from, therefore will being dispersed with very big compressive stress on the faying face of the screw thread pair that bolt 3 and nut 4 are formed, this compressive stress is exactly the reliable guarantee stoping this screw thread pair to get loose. The value of screw thread pair helical pitch difference δ is very crucial, this value is too little, do not have anti-loosing effect, but this value will make too greatly the plastic deformation that threaded generation is very big, cause that follow-up dismoutability is deteriorated, considering in conjunction with combined factors such as the material of screw thread pair, the grade of tolerance, the temperature rise of use occasion, strength at repeated alternation and frequencies in practical application, screw thread pair helical pitch difference δ choosing value generally not should be greater than the 15% of this screw thread pair helical pitch value. And heating-up temperature is main relevant with the poor δ of screw thread pair helical pitch, but heating means are also most important, the indexs such as its accuracy of temperature control of different heating means and intensification uniformity are different, and it is noted that the surplus of temperature rise, otherwise also not having etc. and to complete threaded, the temperature of bolt has been lowered to below the temperature that P+ δ size is corresponding, rule of thumb, this surplus is typically chosen 2 DEG C, and summer is optionally slightly smaller, and winter is optionally bigger than normal.
Claims (3)
1. one kind is used for threaded locking technique, it is characterised in that comprise the technical steps that:
A, make internal and external threads nominal diameter or/and helical pitch has the threaded connector of differentiation;
B, by nominal diameter in threaded connector or/and the less counterpart of helical pitch is heated to the temperature agreed with mutually after it can be made to expand with another counterpart in threaded connector;
C, B process is heated after gained counterpart and threaded connector in another counterpart screw, make the clamp load torque of spanner keep certain time after pretension, counterpart temperature to be heated stops after reducing again.
2. described in claim 1 for threaded locking technique, it is characterised in that in described B process, heating-up temperature depends primarily on the difference of internal and external threads nominal diameter or helical pitch.
3. described in claim 1 for threaded locking technique, it is characterised in that in described B process, heating-up temperature has surplus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610232294.XA CN105673662A (en) | 2016-04-14 | 2016-04-14 | Anti-disengagement process used for threaded connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610232294.XA CN105673662A (en) | 2016-04-14 | 2016-04-14 | Anti-disengagement process used for threaded connection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105673662A true CN105673662A (en) | 2016-06-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610232294.XA Pending CN105673662A (en) | 2016-04-14 | 2016-04-14 | Anti-disengagement process used for threaded connection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105673662A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1450279A (en) * | 2003-04-23 | 2003-10-22 | 刘文西 | Shape memory check screw device |
| CN201866055U (en) * | 2010-10-20 | 2011-06-15 | 吉林省元隆达工装设备有限公司 | Internal high-pressure forming machine and connecting piece thereof |
| CN102536997A (en) * | 2012-02-28 | 2012-07-04 | 苏州麦德尔机械有限公司 | Check bolt |
| CN105485129A (en) * | 2016-01-20 | 2016-04-13 | 苏州国嘉记忆合金有限公司 | Anti-loosen nut with memory alloy ring |
-
2016
- 2016-04-14 CN CN201610232294.XA patent/CN105673662A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1450279A (en) * | 2003-04-23 | 2003-10-22 | 刘文西 | Shape memory check screw device |
| CN201866055U (en) * | 2010-10-20 | 2011-06-15 | 吉林省元隆达工装设备有限公司 | Internal high-pressure forming machine and connecting piece thereof |
| CN102536997A (en) * | 2012-02-28 | 2012-07-04 | 苏州麦德尔机械有限公司 | Check bolt |
| CN105485129A (en) * | 2016-01-20 | 2016-04-13 | 苏州国嘉记忆合金有限公司 | Anti-loosen nut with memory alloy ring |
Non-Patent Citations (1)
| Title |
|---|
| 郭高谦: "浅谈螺纹联接的预紧和防松", 《科学之友（B版）》 * |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160615 |
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| WD01 | Invention patent application deemed withdrawn after publication |