CN101825538A - Method for detecting locking reliability of screws - Google Patents
Method for detecting locking reliability of screws Download PDFInfo
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- CN101825538A CN101825538A CN200910126625A CN200910126625A CN101825538A CN 101825538 A CN101825538 A CN 101825538A CN 200910126625 A CN200910126625 A CN 200910126625A CN 200910126625 A CN200910126625 A CN 200910126625A CN 101825538 A CN101825538 A CN 101825538A
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- screw
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- preset value
- lock knob
- locking
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Abstract
The invention discloses a method for detecting the locking reliability of screws. The method comprises the following steps: locking screws according to a locking torque; detecting the back locking torque of the locked screws; and judging the locking reliability of the screws.
Description
Technical field
The present invention locks relevant for a kind of screw, and particularly relevant for a kind of detection method of locking reliability of screws.
Background technology
Screw be electronic product when assembling the strength member that can use.Lock in the technology at traditional screw, normally with moment of torsion locks quality as screw the management and control index that locks of screw.For example: utilizing electronic or Pneumatic screw driver when locking screw, the moment of torsion output that can guarantee electronic or Pneumatic screw driver is consistent with the moment of torsion that locks of screw, so that screw reliably locks.
In fact, lock in the process at screw, locking reliability of screws is subjected to the influence of several factors.For example: stability that locks skill and electronic or the output of Pneumatic screw driver moment of torsion of the degree of roughness of the thread surface of each screw and corresponding screw thereof, practitioner or the like.Therefore there is bigger variability in the detection of locking reliability of screws.Thus, owing to the screw bad product that produces that gets loose is difficult for being found, and can produce the safety problem of electronic product, thereby cause the producer and user's loss.
Summary of the invention
The object of the present invention is to provide a kind of detection method of locking reliability of screws, to improve the disappearance of prior art.
The detection method of a kind of locking reliability of screws that the present invention proposes, it may further comprise the steps: according to locking moment of torsion, lock screw.The screw that detection locks move back the lock knob square.According to moving back the lock knob square, judge the fiduciary level that locks of screw.
Beneficial effect of the present invention is, that adopts screw moves back the detection index of lock knob square as locking reliability of screws, can find in real time and process for producing in bad product, the product of avoiding having risk flows out and causes the producer and user's loss.
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Figure 1 shows that process flow diagram according to the detection method of a kind of locking reliability of screws of a preferred embodiment of the present invention.
Figure 2 shows that the synoptic diagram that moves back the detection of lock knob square according to the screw of a preferred embodiment of the present invention.
Figure 3 shows that the process flow diagram of the detection method of a kind of locking reliability of screws of another preferred embodiment according to the present invention.
Figure 4 shows that according to the present invention the monitoring figure of the locking reliability of screws detection of a preferred embodiment again.
Embodiment
Figure 1 shows that process flow diagram according to the detection method of the locking reliability of screws of a preferred embodiment of the present invention.Figure 2 shows that the screw according to a preferred embodiment of the present invention moves back lock knob square detection synoptic diagram.The method of present embodiment can statistical process control (SPC) be the basis, is applied to large-scale production process.The detailed description of the detection method of relevant present embodiment please be in the lump with reference to Fig. 1 and Fig. 2.
In step S11, lock screw.Particularly, the operator can be according to the moment of torsion that locks of screw, and (for example: computer apparatus), wherein screw locks moment of torsion and can set in product development stage according to the specification of screw in the product of correspondence to use electronic or Pneumatic screw driver to lock a plurality of screws.
After screw is attached to corresponding product, can begin to carry out the detection that screw locks by product of random selection in the large-tonnage product.
In step S12, provide a torque-measuring apparatus.In the present embodiment, as shown in Figure 2, the operator can utilize torque-measuring apparatus 2 to carry out the detection that screw locks, and wherein torque-measuring apparatus 2 comprises bottle opener 21 and display part 22, and display part 22 is electrically connected at bottle opener 21.
In step S13, the operator can utilize the bottle opener 21 of torque-measuring apparatus 2 to unclamp the screw 23 that has locked, and transmits a torque signal to display part 22.For example: the operator can place bottle opener 21 screw 23 places that locked earlier, utilizes bottle opener 21 to unclamp screw 23 then.In the process of unclamping, the moment of torsion of bottle opener 21 by its inner moment of torsion inductor induction screw 23 is to obtain the corresponding torque signal, and bottle opener 21 is sent to display part 22 with the torque signal of sensing then.Display part 22 receives torque signal and it is changed to show the change in torque of screws 23 synchronously in display part 22.
In step S14, when bottle opener 21 unclamped screw, the operator can observe the maximal value of the moment of torsion that display part 22 shows, and read maximal value be required detection screw 23 move back the lock knob square.
In the present embodiment, detection obtain screw move back the lock knob square after, shown in step S15, what the operator can compare screw moves back lock knob square and one first preset value.If screw move back the lock knob square more than or equal to first preset value, can judge screw qualified for locking (step S16).
In the present embodiment, if screw move back the lock knob square less than first preset value, the operator can judge screw defective for locking (step S17).Wherein, first preset value can be obtained by a vibration test.Concrete grammar is described below.
In the present embodiment, vibration test can be undertaken by a vibration rig and a torque-measuring apparatus.Wherein vibration rig comprises a shaking table and a controller.Controller electrically connects the vibration of shaking table with the control shaking table.
In the present embodiment, when carrying out vibration test, at first selected screw lock moment of torsion M.According to locking moment of torsion M, the operator can use electronic or Pneumatic screw driver locks the product of screw in correspondence subsequently.Afterwards, operator's available torque measurement mechanism detect corresponding lock moment of torsion M move back lock knob square M1.
In the present embodiment, detect move back lock knob square M1 after, again according to locking moment of torsion M, lock screw again.And the product that will lock screw places on the shaking table of vibration rig, carries out vibration test with controller control.
In the present embodiment, after vibration test, check whether the screw that has locked gets loose from product.If screw does not get loose, successively decreasing with Δ M locks moment of torsion M, repeats above step and carries out vibration test, till screw after the vibration test gets loose from product.
In the present embodiment, suppose the n+2 time vibration test after, screw gets loose from product, first preset value is obtained in the time of can being defined as carrying out the n+1 time vibration test moves back the lock knob square, screw moves back the lock knob square when promptly locking moment of torsion and be M-n * Δ M.Wherein, first preset value can ask average method to obtain by repeatedly measuring.Usually in large-scale production, the screw number of the number of times of vibration test and use is many more, and resulting first preset value is valuable more to production run.Yet the present invention does not do any qualification to this.
In the present embodiment, when practical application, if screw move back the lock knob square more than or equal to first preset value, can judge that screw is qualified for locking.If screw move back the lock knob square less than first preset value, can judge that screw is defective for locking, the screw of producing in promptly should the stage need be processed again.Yet the present invention does not do any qualification to this.
Figure 3 shows that the process flow diagram of the detection method of the locking reliability of screws of another preferred embodiment according to the present invention.Please refer to Fig. 3.Step S11～step the S15 among the same embodiment of step S21～step S25 wherein.So in the present embodiment, repeat no more.
The difference of a present embodiment and a last embodiment is, also comprises step S27 in the present embodiment.In step S27, relatively screw moves back lock knob square and one second preset value.
In the present embodiment, first preset value and second preset value all can obtain by a vibration test.And the vibration test in the present embodiment is identical with vibration test step among the last embodiment, so do not repeat them here.
Vibration test among the same embodiment, suppose the n+2 time vibration test after, screw gets loose.First preset value can be defined as locking moment of torsion when being M-n * Δ M moves back the lock knob square.Take all factors into consideration the safety coefficient of product, second preset value can be defined as locking moment of torsion be [M+ (M-n * Δ M)]/2 o'clock move back the lock knob square.
In the present embodiment, second preset value is greater than first preset value.First preset value and second preset value all can ask average method to obtain by repeatedly measuring.Yet the present invention does not do any qualification to this.And the screw number of carrying out vibration test is not done any qualification yet.
Shown in step S25, relatively screw moves back the lock knob square and first preset value.If screw move back the lock knob square less than first preset value, the operator can judge screw defective for locking (step S26).
In the present embodiment, shown in step S27, if screw move back the lock knob square more than or equal to first preset value, then relatively screw move back the lock knob square and second preset value.If screw move back the lock knob square more than or equal to second preset value, the operator can judge that screw is for locking reliable (step S28).
In the present embodiment, shown in step S29, if screw move back the lock knob square more than or equal to first preset value and less than second preset value, then screw is unreliable for locking.
In actual applications, if screw move back the lock knob square more than or equal to second preset value, can judge that screw is reliable for locking, promptly production run is normal.If screw move back the lock knob square less than second preset value and more than or equal to first preset value, can judge that screw is unreliable for locking, promptly have problems in the production run, need to analyze reason and take some countermeasures and improve production run.If screw move back the lock knob square less than first preset value, can judge that screw is defective for locking, the screw of producing in promptly should the stage need be processed again.Yet the present invention does not do any qualification to this.
In actual applications,, can make statistical process control (SPC) chart and show that in real time screw moves back the variation tendency of lock knob square, be convenient to note abnormalities aborning take corrective action in real time to improve and produce for monitoring industrial processes better.
Figure 4 shows that according to the present invention the monitoring figure of the locking reliability of screws detection of a preferred embodiment again.Please refer to Fig. 4.Be in the production run shown in the figure, the variation tendency of moving back the lock knob square of the screw of a kind of 6-32 specification of sampling in real time.As shown in Figure 4, on behalf of screw, the longitudinal axis move back the measurement range of lock knob square, and transverse axis is represented the production time.
In the present embodiment, first preset value is 0.013Nm (being dotted line L1), and second preset value is 0.02Nm (being solid line L2).Second preset value is greater than first preset value.In process of production, move back according to the screw of the real-time sampling Detection of describing method of a last embodiment that the lock knob square is shown in the figure to be filled circles.As can be seen from Figure 4, the screw of sampling Detection move back the lock knob square all greater than second preset value (L2), in this production run, screw is reliable for locking, promptly this production run is normal.
If in real-time testing process, a certain stage screw move back the lock knob square less than second preset value (L2) and more than or equal to first preset value (L1), then should the stage screw unreliable for locking, need the analysis reason, improve production run.If a certain stage, screw move back the lock knob square less than first preset value (L1), then should the stage screw defective for locking, promptly the screw that should produce in the stage need be processed again.
In sum, thus the detection method of the locking reliability of screws that the embodiment of the invention provided is by detecting the fiduciary level that locks that the lock knob square is judged screw of moving back of screw.If screw move back the lock knob square more than or equal to second preset value, screw is for locking reliably.If screw move back the lock knob square less than second preset value and more than or equal to first preset value, screw is unreliable for locking.If screw move back the lock knob square less than first preset value, screw is defective for locking.The direct detection index of lock knob square as locking reliability of screws moved back in employing, can under the trust level of setting, whether reach designing requirement by the assessment product, and can carry out real-time management and control to production run by the SPC chart, can when product surpasses the expection variation, find in real time and handle, avoid the outflow of defective products and cause the producer and user's loss.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; have in the technical field under any and know the knowledgeable usually; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking claims person of defining.
Claims (6)
1. the detection method of a locking reliability of screws is characterized in that, may further comprise the steps:
According to locking moment of torsion, lock screw;
That detects the above-mentioned screw that locks moves back the lock knob square; And
According to the above-mentioned lock knob square that moves back, judge the fiduciary level that locks of above-mentioned screw.
2. detection method according to claim 1, it is characterized in that, when above-mentioned screw above-mentioned moves back the lock knob square more than or equal to first preset value, judge that above-mentioned screw is qualified for locking, when above-mentioned screw above-mentioned moves back the lock knob square less than above-mentioned first preset value, judge that above-mentioned screw is defective for locking.
3. detection method according to claim 2 is characterized in that, above-mentioned first preset value is obtained by vibration test.
4. detection method according to claim 2 is characterized in that, when above-mentioned screw above-mentioned moves back the lock knob square more than or equal to second preset value, judges that above-mentioned screw is reliable for locking, and above-mentioned second preset value is greater than above-mentioned first preset value.
5. detection method according to claim 4 is characterized in that, above-mentioned second preset value is obtained by vibration test.
6. detection method according to claim 1 is characterized in that, the step of moving back the lock knob square of the above-mentioned screw of above-mentioned detection comprises:
Torque-measuring apparatus is provided, and it comprises bottle opener and display part, and above-mentioned display part is electrically connected at above-mentioned bottle opener;
Utilize above-mentioned bottle opener to unclamp above-mentioned screw and transmit torque signal to above-mentioned display part; And
The maximal value that reads above-mentioned display part demonstration is the above-mentioned lock knob square that moves back.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101266251A CN101825538B (en) | 2009-03-05 | 2009-03-05 | Method for detecting locking reliability of screws |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101266251A CN101825538B (en) | 2009-03-05 | 2009-03-05 | Method for detecting locking reliability of screws |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101825538A true CN101825538A (en) | 2010-09-08 |
| CN101825538B CN101825538B (en) | 2012-08-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101266251A Expired - Fee Related CN101825538B (en) | 2009-03-05 | 2009-03-05 | Method for detecting locking reliability of screws |
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| CN (1) | CN101825538B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102736111A (en) * | 2011-04-08 | 2012-10-17 | 神讯电脑(昆山)有限公司 | Detection device for screw locking |
| CN103576637A (en) * | 2012-07-20 | 2014-02-12 | 和硕联合科技股份有限公司 | Control method and control system for product processing operation |
| CN109397170A (en) * | 2018-11-23 | 2019-03-01 | 中国航发北京航科发动机控制系统科技有限公司 | A kind of verification method of the effective screw-down torque of locking nut |
| CN110715798A (en) * | 2019-09-25 | 2020-01-21 | 上海发电设备成套设计研究院有限责任公司 | Test device and test method for measuring self-loosening of bolt |
| CN111489517A (en) * | 2019-01-25 | 2020-08-04 | 富士康精密电子（太原）有限公司 | Screw locking abnormity warning method and device, computer device and storage medium |
-
2009
- 2009-03-05 CN CN2009101266251A patent/CN101825538B/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102736111A (en) * | 2011-04-08 | 2012-10-17 | 神讯电脑(昆山)有限公司 | Detection device for screw locking |
| CN102736111B (en) * | 2011-04-08 | 2016-09-07 | 神讯电脑(昆山)有限公司 | Screw locking detecting device |
| CN103576637A (en) * | 2012-07-20 | 2014-02-12 | 和硕联合科技股份有限公司 | Control method and control system for product processing operation |
| CN103576637B (en) * | 2012-07-20 | 2016-01-20 | 和硕联合科技股份有限公司 | Control method and control system for product processing operation |
| CN109397170A (en) * | 2018-11-23 | 2019-03-01 | 中国航发北京航科发动机控制系统科技有限公司 | A kind of verification method of the effective screw-down torque of locking nut |
| CN109397170B (en) * | 2018-11-23 | 2020-11-13 | 中国航发北京航科发动机控制系统科技有限公司 | Method for verifying effective tightening torque of lock nut |
| CN111489517A (en) * | 2019-01-25 | 2020-08-04 | 富士康精密电子（太原）有限公司 | Screw locking abnormity warning method and device, computer device and storage medium |
| CN111489517B (en) * | 2019-01-25 | 2023-08-01 | 富士康精密电子（太原）有限公司 | Screw locking abnormality warning method, device, computer device and storage medium |
| CN110715798A (en) * | 2019-09-25 | 2020-01-21 | 上海发电设备成套设计研究院有限责任公司 | Test device and test method for measuring self-loosening of bolt |
| CN110715798B (en) * | 2019-09-25 | 2021-05-11 | 上海发电设备成套设计研究院有限责任公司 | Test device and test method for measuring self-loosening of bolt |
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| Publication number | Publication date |
|---|---|
| CN101825538B (en) | 2012-08-08 |
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Granted publication date: 20120808 |