CN105372003B - Tools for bolts ' pretension force measuring method - Google Patents
Tools for bolts ' pretension force measuring method Download PDFInfo
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- CN105372003B CN105372003B CN201410418888.0A CN201410418888A CN105372003B CN 105372003 B CN105372003 B CN 105372003B CN 201410418888 A CN201410418888 A CN 201410418888A CN 105372003 B CN105372003 B CN 105372003B
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Abstract
The invention belongs to Aero-Space field of measuring technique, and in particular to a kind of tools for bolts ' pretension force measuring method.Comprise the following steps：A ring washer is processed, its upper and lower end face processes an annular boss respectively, and upper surface is different from the boss diameter of lower surface；Four grooves are uniformly processed by crook in packing ring, paste foil gauge respectively in the upper and lower surface of groove；Full-bridge circuit is installed to packing ring welding lead；Packing ring is demarcated；By screw bolt passes packing ring and interface during measurement, and with nut, the wire that packing ring is drawn connects constant voltage dc source and voltmeter respectively；Screw-down torque is applied to bolt, pretightning force caused by bolt is tightened and is applied on packing ring, corresponding magnitude of voltage is read on voltmeter, control demarcation certificate obtains bolt pretightening；It is classified other to bolt application screw-down torque, with the time stage measurement corresponding output voltage of packing ring, the pretension force value measured by the way that packing ring is calculated；Fitting Bolt Tightening Force square measures pretightning force relation with packing ring.
Description
Technical field
The invention belongs to Aero-Space field of measuring technique, and in particular to a kind of tools for bolts ' pretension force measuring method.
Background technology
In the nacelle and section of Aerospace Products, in large quantities using screw connection structure part as securing member,
Wherein especially it is most widely used with bolt in section interface.By applying screw-down torque to bolt to produce pretightning force,
Reach the connection and fastening section.Whether connector Prestress design is reasonable between section, and directly influencing section connection can
By property, such as bonding strength, rigidity and locking.
Conventional threaded connection Prestress design is all calculated by empirical equation, and its real load is had no way of
Know.This causes formal product certain potential safety hazard, the too low effect that can not reach connection and fastening of pretightning force, pretightning force to be present
It is too high, interface can be damaged.
The content of the invention
It is an object of the invention to provide a kind of tools for bolts ' pretension force measuring method, and fastener is threadedly coupled with effective measurement
True pretightning force.
To reach above-mentioned purpose, the technical solution used in the present invention is：
A kind of tools for bolts ' pretension force measuring method, this method comprise the following steps：
Step 1：Process a ring washer, its upper and lower end face processes an annular boss respectively, upper surface and lower surface it is convex
Platform diameter is different；
Step 2：Four grooves are uniformly processed with 90 ° by crook in packing ring, weaken its local stiffness, make it when being pressurized
Produce bigger strain；
Step 3：Foil gauge is pasted respectively in the upper and lower surface of four grooves of packing ring, pastes 8 altogether, R1-R4
In upper surface, R5-R8 is in lower surface；
Step 4：Full-bridge circuit is installed to packing ring welding lead, four bridge arms are respectively R1R2, R3R4, R5R6, R7R8,
UiFor input voltage, UoIt is as follows for output voltage, both relations：
Wherein R is strain sheet resistance values, and △ R are foil gauge resistance change amount；
Step 5：The packing ring to complete is delivered into the First Astronautic Research Institute for Measurement and Test with related qualification to be demarcated, obtain pretightning force with
The corresponding relation of voltage output demarcates certificate；The corresponding relation of pretightning force and output voltage is obtained, it is as follows：
P=21.29Uo
P is pretightning force, unit KN；UoFor output voltage, unit V；
Step 6：During measurement, by screw bolt passes packing ring and interface, and the wire drawn with nut, packing ring
Constant voltage dc source and voltmeter are connected respectively；Screw-down torque is applied to bolt by torque spanner, tightened caused by bolt
Pretightning force is applied on packing ring, and corresponding magnitude of voltage is read on voltmeter, and control demarcation certificate obtains bolt pretightening；
Step 7：Be classified it is other to bolt apply screw-down torque, with time stage measure the corresponding output voltage of packing ring, pass through meter
Calculation obtains the pretension force value that packing ring measures；
Step 8：Fitting Bolt Tightening Force square measures pretightning force relation with packing ring, show that formula is as follows：
P=0.5159M+0.3436
Note：P is bolt pretightening (KN), M is screw-down torque (Nm).
The step 1：When packing ring is by axial compressive force, additional bending moment can be produced between two boss, make its upper end
Face produces stretching strain, and lower surface produces compressive strain.
The step 7：Be classified it is other to bolt apply screw-down torque, successively load 25Nm, 50Nm, 75Nm, 100Nm,
125Nm。
Having the beneficial effect that acquired by the present invention：
Tools for bolts ' pretension force measuring method of the present invention can effectively measure the true pretightning force of threaded connection fastener,
And the demarcation of screw-down torque and pretightning force is carried out to specific bolt using the means tested, screwing force when providing threaded connection installation
The term of reference of square.
Brief description of the drawings
Fig. 1 is packing ring sectional view；
Fig. 2 is full-bridge circuit figure；
Fig. 3 is the upper surface foil gauge scheme of installation of four grooves of packing ring；
Fig. 4 is the lower surface foil gauge scheme of installation of four grooves of packing ring；
Fig. 5 is screw-down torque and pretightning force graph of a relation.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Tools for bolts ' pretension force measuring method of the present invention comprises the following steps：
Step 1：As shown in figure 1, one ring washer of processing, its upper and lower end face process an annular boss respectively, upper surface with
The boss diameter of lower surface is different.When packing ring is by axial compressive force, additional bending moment can be produced between two boss, made thereon
End face produces stretching strain, and lower surface produces compressive strain；
Step 2：Four grooves are uniformly processed with 90 ° by crook in packing ring, weaken its local stiffness, make it when being pressurized
Bigger strain is produced, increases sensitivity during its measurement；
Step 3：As shown in Figure 3, Figure 4, foil gauge is pasted respectively in the upper and lower surface of four grooves of packing ring,
8 are pasted altogether, and R1-R4 is in upper surface, and R5-R8 is in lower surface；
Step 4：As shown in Fig. 2 installation full-bridge circuit to packing ring welding lead, four bridge arms be respectively R1R2, R3R4,
R5R6, R7R8, UiFor input voltage, UoIt is as follows for output voltage, both relations：
Wherein R is strain sheet resistance values, and △ R are foil gauge resistance change amount；
Step 5：The packing ring to complete is delivered into the First Astronautic Research Institute for Measurement and Test with related qualification to be demarcated, obtain pretightning force with
The corresponding relation of voltage output demarcates certificate；The corresponding relation of pretightning force and output voltage is obtained, it is as follows：
P=21.29Uo
P is pretightning force, unit KN；UoFor output voltage, unit V.
Step 6：During measurement, by screw bolt passes packing ring and interface, and the wire drawn with nut, packing ring
Constant voltage dc source and voltmeter are connected respectively；Screw-down torque is applied to bolt by torque spanner, tightened caused by bolt
Pretightning force is applied on packing ring, and corresponding magnitude of voltage is read on voltmeter, and control demarcation certificate obtains bolt pretightening；
Step 7：Be classified it is other to bolt apply screw-down torque, successively load 25Nm, 50Nm, 75Nm, 100Nm, 125Nm；Together
Time stage measures the corresponding output voltage of packing ring, the pretension force value measured by the way that packing ring is calculated.
Step 8：Fitting Bolt Tightening Force square measures pretightning force relation with packing ring, as shown in figure 5, showing that formula is as follows：
P=0.5159M+0.3436
Note：P is bolt pretightening (KN), M is screw-down torque (Nm).
Claims (3)
- A kind of 1. tools for bolts ' pretension force measuring method, it is characterised in that：This method comprises the following steps：Step 1：The packing ring of the annular of processing one, its upper and lower end face process the boss of an annular respectively, upper surface and lower surface it is convex Platform diameter is different；Step 2：Four grooves are uniformly processed with 90 ° by crook in packing ring, weaken its local stiffness, it is produced when being pressurized Bigger strain；Step 3：Foil gauge is pasted respectively in the upper and lower surface of four grooves of packing ring, pastes 8 altogether, upper surface four The resistance of individual foil gauge is respectively R1-R4, and the resistance of four foil gauges in lower surface is respectively R5-R8；Step 4：Full-bridge circuit is installed to packing ring welding lead, four bridge arms are respectively R1R2, R3R4, R5R6, R7R8, UiTo be defeated Enter voltage, UoIt is as follows for output voltage, both relations：<mrow> <msub> <mi>U</mi> <mi>o</mi> </msub> <mo>&ap;</mo> <mfrac> <msub> <mi>U</mi> <mi>i</mi> </msub> <mn>8</mn> </mfrac> <mo>&lsqb;</mo> <mrow> <mo>(</mo> <mfrac> <mrow> <msub> <mi>&Delta;R</mi> <mn>1</mn> </msub> </mrow> <msub> <mi>R</mi> <mn>1</mn> </msub> </mfrac> <mo>+</mo> <mfrac> <mrow> <msub> <mi>&Delta;R</mi> <mn>2</mn> </msub> </mrow> <msub> <mi>R</mi> <mn>2</mn> </msub> </mfrac> <mo>)</mo> </mrow> <mo>-</mo> <mrow> <mo>(</mo> <mfrac> <mrow> <msub> <mi>&Delta;R</mi> <mn>3</mn> </msub> </mrow> <msub> <mi>R</mi> <mn>3</mn> </msub> </mfrac> <mo>+</mo> <mfrac> <mrow> <msub> <mi>&Delta;R</mi> <mn>4</mn> </msub> </mrow> <msub> <mi>R</mi> <mn>4</mn> </msub> </mfrac> <mo>)</mo> </mrow> <mo>+</mo> <mrow> <mo>(</mo> <mfrac> <mrow> <msub> <mi>&Delta;R</mi> <mn>5</mn> </msub> </mrow> <msub> <mi>R</mi> <mn>5</mn> </msub> </mfrac> <mo>+</mo> <mfrac> <mrow> <msub> <mi>&Delta;R</mi> <mn>6</mn> </msub> </mrow> <msub> <mi>R</mi> <mn>6</mn> </msub> </mfrac> <mo>)</mo> </mrow> <mo>-</mo> <mrow> <mo>(</mo> <mfrac> <mrow> <msub> <mi>&Delta;R</mi> <mn>7</mn> </msub> </mrow> <msub> <mi>R</mi> <mn>7</mn> </msub> </mfrac> <mo>+</mo> <mfrac> <mrow> <msub> <mi>&Delta;R</mi> <mn>8</mn> </msub> </mrow> <msub> <mi>R</mi> <mn>8</mn> </msub> </mfrac> <mo>)</mo> </mrow> <mo>&rsqb;</mo> </mrow>Wherein △ R1 are R1 variable quantity, and △ R2 are R2 variable quantity, and △ R3 are R3 variable quantity, and △ R4 are R4 variable quantity, △ R5 are R5 variable quantity, and △ R6 are R6 variable quantity, and △ R7 are R7 variable quantity, and △ R8 are R8 variable quantity；Step 5：The packing ring to complete is delivered into the First Astronautic Research Institute for Measurement and Test with related qualification to be demarcated, obtains pretightning force and voltage The corresponding relation of output demarcates certificate；The corresponding relation of pretightning force and output voltage is obtained, it is as follows：P=21.29UoP is pretightning force, unit KN；UoFor output voltage, unit V；Step 6：During measurement, by screw bolt passes packing ring and interface, and with nut, the wire difference that packing ring is drawn Connect constant voltage dc source and voltmeter；Screw-down torque is applied to bolt by torque spanner, tightens pretension caused by bolt Power is applied on packing ring, and corresponding magnitude of voltage is read on voltmeter, and control demarcation certificate obtains bolt pretightening；Step 7：Be classified it is other to bolt apply screw-down torque, with time stage measure the corresponding output voltage of packing ring, by calculating The pretension force value measured to packing ring；Step 8：Fitting Bolt Tightening Force square measures pretightning force relation with packing ring, show that formula is as follows：P=0.5159M+0.3436Note：P is bolt pretightening, M is screw-down torque.
- 2. tools for bolts ' pretension force measuring method according to claim 1, it is characterised in that：The step 1：When packing ring by During axial compressive force, additional bending moment can be produced between two boss, its upper surface is produced stretching strain, lower surface produces pressure should Become.
- 3. tools for bolts ' pretension force measuring method according to claim 1, it is characterised in that：The step 7：It is classified other to spiral shell Bolt applies screw-down torque, loads 25Nm, 50Nm, 75Nm, 100Nm, 125Nm successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410418888.0A CN105372003B (en) | 2014-08-22 | 2014-08-22 | Tools for bolts ' pretension force measuring method |
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|---|---|---|---|
| CN201410418888.0A CN105372003B (en) | 2014-08-22 | 2014-08-22 | Tools for bolts ' pretension force measuring method |
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| CN105372003B true CN105372003B (en) | 2018-02-13 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106126765B (en) * | 2016-03-15 | 2018-12-21 | 重庆长安汽车股份有限公司 | A kind of prediction technique of the discrete pretightning force of bolt corner method |
| CN106323531B (en) * | 2016-09-12 | 2019-07-12 | 大连理工大学 | A kind of aero-engine low-pressure turbine reel fastening force detection method and device based on speckle interference principle |
| CN110441042B (en) * | 2019-08-12 | 2020-10-20 | 中国科学院高能物理研究所 | System and method for calibrating locking force of HEPS-TF high-precision support |
| CN111678627A (en) * | 2020-05-21 | 2020-09-18 | 北京交通大学 | Stress test method for shield tunnel segment connecting bolt |
| CN111928990A (en) * | 2020-07-31 | 2020-11-13 | 东风柳州汽车有限公司 | Method and device for monitoring vehicle bolt tightening torque |
| CN114061820A (en) * | 2021-10-20 | 2022-02-18 | 广州建筑股份有限公司 | Monitoring device and monitoring method for tightening torque of scaffold fastener |
| CN114563120A (en) * | 2022-03-17 | 2022-05-31 | 中国电子科技集团公司第十四研究所 | Tightening torque determination method |
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| JPS60216235A (en) * | 1984-04-12 | 1985-10-29 | Toyota Motor Corp | Bolt axial force measurement and bolt tightening apparatus using the same |
| JPH06137975A (en) * | 1992-10-28 | 1994-05-20 | Tonichi Seisakusho:Kk | Tightening torque measuring device |
| CN102519652A (en) * | 2011-12-16 | 2012-06-27 | 天津大学 | Bolt pre-tightening force testing device and control method thereof |
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2014
- 2014-08-22 CN CN201410418888.0A patent/CN105372003B/en active Active
Patent Citations (6)
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| JPS60216235A (en) * | 1984-04-12 | 1985-10-29 | Toyota Motor Corp | Bolt axial force measurement and bolt tightening apparatus using the same |
| JPH06137975A (en) * | 1992-10-28 | 1994-05-20 | Tonichi Seisakusho:Kk | Tightening torque measuring device |
| CN102519652A (en) * | 2011-12-16 | 2012-06-27 | 天津大学 | Bolt pre-tightening force testing device and control method thereof |
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| CN103323170A (en) * | 2013-06-14 | 2013-09-25 | 内蒙古第一机械集团有限公司 | Pretightening force measuring system and method of bolt set connection |
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