CN108760531A - A kind of screw thread class fastener torque test method - Google Patents
A kind of screw thread class fastener torque test method Download PDFInfo
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- CN108760531A CN108760531A CN201810522822.4A CN201810522822A CN108760531A CN 108760531 A CN108760531 A CN 108760531A CN 201810522822 A CN201810522822 A CN 201810522822A CN 108760531 A CN108760531 A CN 108760531A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/22—Investigating strength properties of solid materials by application of mechanical stress by applying steady torsional forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/24—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to a kind of screw thread class fastener torque test methods comprising following steps：Obtain connector information and fits kind；It determines test sample quantity and gets ready the goods；Determine tooling and equipment；The final torque of setting means tightens strategy and rotating speed；It determines urgent end, screw element is tightened to Joint failure according to setting program；Collect rundown process torsion curve；According to failure mode, torque value is obtained；Data processing is carried out to torque value, determines assembly torque.Test result accuracy of the present invention is high；Realize positive torque exploitation, for specific connection, ultimate failure torque is obtained by test, scientific disposal is carried out to data to obtain reasonably assembling torque, test process may be implemented to simulate erecting yard completely simultaneously, tool, environment, process conditions are completely the same, the influence that exclusive PCR factor brings test result.
Description
Technical field
The present invention relates to mechanical engineering equipment technical field more particularly to a kind of screw thread class fastener torque test methods.
Background technology
The features such as threaded connection is simple and quick, reusable, of low cost with its assembly is widely used in heavy truck industry,
An average heavy truck possesses to be threadedly coupled at about 1500, therefore the reliability of assembling quality is most important.Current technology
Ability, the overwhelming majority, which is threadedly coupled, still relies on moment of torsion control assembling quality, therefore the correctness of torque setting is key one
Ring.
Currently, the main method of major main engine plants' setting torque is to use for reference other main engine plants or preliminary project experience, then according to
It is verified by rack or road test, final torque is determined by amendment repeatedly.There are prodigious drawbacks for this method, on the one hand
It can take a substantial amount of time, manpower, on the other hand exist and verify insufficient possibility, later stage hidden danger is very big.Separately there is part host
Factory cooperates by external advanced technology, while with domestic advanced laboratory, carries out positive test and determines assembly torque, this
Method accuracy is high, but testing expense is expensive, is often tested, can not be directed to whole just for especially important and crucial position
All connecting portion expansion tests of vehicle, practicability is insufficient.
Based on the above considerations, the present invention devises a kind of screw thread class fastener torque test method, can be in project
Early period carries out test to all screw connection points and obtains rational assembly torque.
Invention content
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of screw thread class fastener torque test methods.
In order to achieve the object of the present invention, the technical solution adopted by the present invention is：
The invention discloses a kind of screw thread class fastener torque test methods, include the following steps：
Step S101：Obtain connector information and fits kind；
Step S102：It determines test sample quantity and gets ready the goods；
Step S103：Determine tooling and equipment；
Step S104：The final torque of setting means tightens strategy and rotating speed；
Step S105：It determines urgent end, screw element is tightened to Joint failure according to setting program；
Step S106：Collect rundown process torsion curve；
Step S107：According to failure mode, torque value is obtained；
Step S108：Data processing is carried out to torque value, determines assembly torque.
In the step S101, the connector information includes connector material, surface treatment, thickness and fastener
Specification grade；The fits kind include bolts and nuts mating connection structure, bolt and threaded hole mating connection structure and
Self threading pin is connected with pre-manufactured hole.
In the step S102, the sample coupon quantity is no less than ten groups.
In the step S107, the failure mode includes bolt fracture, thread stripping etc..
In the step S108, the data processing includes the following steps：
Extract the reference point on torsion curve；
It determines torque maximum and minimum value, calculates average value, standard value；
Dispersion；
It calculates and recommends maximum torque；
It is compared with normal value according to calculated maximum torque；
Verification.
Reference point on the step extraction torsion curve includes driving torque, fitting torque, surrender torque, pole
Limited torque.
The method of reference point on the extraction torsion curve include manually take point, tangential method, angle offset method with
And slope biasing means etc..
The beneficial effects of the present invention are：
1. the present invention, compared with traditional torque determines method, test result accuracy is high.Traditional torque determines method
To use for reference main engine plants/supplier or preliminary project experience, then verified by rack or road test, it is true by amendment repeatedly
It is fixed.The present invention realizes positive torque exploitation, and for specific connection, ultimate failure torque is obtained by test, to data into
Row scientific disposal obtains reasonably assembling torque, while test process may be implemented to simulate erecting yard completely, tool, environment,
Process conditions are completely the same, the influence that exclusive PCR factor brings test result；
2. easily implementation cost of the invention is low, can be by erecting yard electric tool and live tooling using this method, can
Implementation is strong, fully achieves autonomous test, removes third-party testing expense and logistics transportation expense from.
Description of the drawings
Fig. 1 is that the method-of present invention extraction yield point takes a method manually；
Fig. 2 is method-tangential method of present invention extraction yield point；
Fig. 3 is method-angle offset method of present invention extraction yield point；
Fig. 4 is method-slope biasing means of present invention extraction yield point；
Fig. 5 is the torsion curve that failure mode of the present invention is bolt fracture；
Fig. 6 is that failure mode of the present invention is the torsion curve that screw thread is threaded off；
Fig. 7 is that failure mode of the present invention is other torsion curves；
Fig. 8 is a test method flow chart of the invention；
Fig. 9 is the assembling schematic diagram of embodiment one；
Figure 10 is the failure bolt figure of embodiment one；
Figure 11 is the test result torsion curve figure of embodiment one.
Specific implementation mode
Present invention will be further explained below with reference to the attached drawings and examples：
Referring to Fig. 1-Figure 10.
The invention discloses a kind of screw thread class fastener torque test methods, include the following steps：
Step S101：Obtain connector information and fits kind, the connector information includes connector material, at surface
Reason, thickness and fastener specification grade；The fits kind includes bolts and nuts mating connection structure, bolt and threaded hole
Mating connection structure and self threading pin are connected with pre-manufactured hole；
Step S102：It determines test sample quantity and gets ready the goods, according to connector information and fits kind, to prepare at least 10
The exemplar that group can be tested completely newly generally requires and prepares 12-15 groups, if being tested in the presence of that can not provide actual parts
, replacing part can be found, but need to ensure replacing part and actual parts material having the same, thickness, aperture, rough surface
Degree and surface treatment etc.；
Step S103：It determines tooling and equipment, including is determined to the tooling of limitation all degree of freedom of connection structure, if not
Have needs to be customized；There are the DC driving instruments of enough torque capabilities (to recommend Stanley or Atlas including determination
CopCo controllers and tool), depending on the size of fastener, tool, which needs to have, twists into two parts fastening for tool and size sensor
The ability of part, sensor need to have enough precision record torques, corner and rotating speed.Under normal circumstances, it is contemplated that maximum turn round
Square should be 50% to the 75% of selected transducer range；
Step S104：The final torque of setting means tightens strategy and rotating speed；It is preliminary according to the specification grade of securing member
Judge that tightening device is set as a step and tightened, according to final torque setting tool by the torque needed for bolt surrender, general setting
Rotating speed, it is as follows with reference to table 1：
The corresponding test rotating speed of the different fastener sizes of table 1
| Fastener sizes | Test rotating speed/RPM |
| M4/ST4.2 | 400 |
| M5-M8 | 200 |
| M10 | 150 |
| M12 | 100 |
| ≥M14 | 50 |
Step S105：It determines urgent end, screw element is tightened to Joint failure according to setting program, the urgent end of determination,
Screw element is tightened to Joint failure according to setting program, urgent one end is consistent with practical entrucking when to ensure to test,
Bolt is screwed onto surrender to be tightened to tool torque no longer to rise or until sleeve no longer rotates；
Step S106：Rundown process torsion curve is collected, for connection control cabinet and pc client, download was tightened
Journey torsion curve；Driving torque, fitting torque, surrender torque, the limit are acquired according to collected torsion curve
Torque；
Step S107：According to failure mode, torque value is obtained, to combine rundown process torsion curve and failure
Situation judges that failure mode is bolt fracture, thread stripping, other (parts surrender, drive corruption etc.) first；
Step S108：Data processing is carried out to torque value, determines assembly torque, the data processing step is according to different mistakes
Effect pattern：
1) bolt fracture mode data is analyzed：
Extract the reference point of (as shown in Figure 5) on curve：Driving torque is bonded torque, surrenders torque, ultimate torque；
It determines maximum and minimum value, calculates average value, standard deviation, -3 standard deviation of average value ,+3 standard deviation of average value；
Dispersion：Standard deviation/average value, 10% of standard deviation more than average value mean that data are not enough or inclined
Difference is too big；
It calculates and recommends maximum torque：
Maximum value≤0.85x [- 3 standard deviation of surrender torque]
According to calculated maximum value, normal value is found from operation card.Being slightly larger than maximum value 2% or 3% can
With receiving；
Verification
The minimum value of torque>The greater (+3 standard deviation of driving torque ,+3 standard deviation of fitting torque) is for the positions CC, if work
Cheng Shi feels the need to improve torque to -3 standard deviation of torque is surrendered, and can be discussed with project fastener engineer, fastener work
The further torsion-testings of journey Shi Yaoqiu or torque-clamping force test.
2) bolt slide fastener data analysis
Extract the reference point of (as shown in Figure 6) on curve：Driving torque is bonded torque, surrenders torque, ultimate torque；
It determines maximum and minimum value, calculates average value, standard deviation, -4 standard deviation of average value ,+4 standard deviation of average value；
Evaluation criteria deviation：Standard deviation/average value, standard deviation be more than average value 10% mean data not enough or
Deviation is too big；
It calculates and recommends maximum torque：
Maximum value≤[- 4 standard deviation of surrender torque]
According to calculated maximum value, normal value is found from operation card；
Verification
The minimum value of torque>The greater (+4 standard deviation of driving torque ,+4 standard deviation of fitting torque)
3) other mode datas are assessed
Extract the reference point of (as shown in Figure 7) on curve：Driving torque is bonded torque, ultimate torque；
It determines maximum and minimum value, calculates average value, standard deviation, -4 standard deviation of average value ,+4 standard deviation of average value；
Dispersion：Standard deviation/average value, 10% of standard deviation more than average value mean that data are not enough or inclined
Difference is too big；
It calculates and recommends maximum torque：
Maximum value≤[- 4 standard deviation of ultimate torque]
According to calculated maximum value, the normal value for best suiting requirement is found from work card；
Verification
The minimum value of torque>The greater (+4 standard deviation of driving torque ,+4 standard deviation of fitting torque)
If limit mode is drive corruption, then when fracture is not to be exceeded in the peak torque recommended torque 50%.
The method of reference point on the extraction torsion curve include manually take point, tangential method, angle offset method with
And slope biasing means etc..
Such as Fig. 1, take manually a little：It takes manually and a little depends on generated straight line, the changed point of straight line is exactly yield point.
One is manually generated most close to the straight line of torsion curve linearly interval, and the changed point of straight line is exactly yield point, this
The precision of method depends on data acquiring frequency and magnifying power.
Such as Fig. 2, tangential method:Tangential method depends on the slope (gradient, unit Nm/degree) of elastic section straight line.
Straight slope changes, and the point of contact of tangent line is exactly yield point.Under normal circumstances, slope, which changes, measures 50%-25%.
Such as Fig. 3, angle offset method：Dependent on the straight line of generation, the intersection point of straight line and angle axis.Keep slope constant, it will
Straight line deviates a certain distance, can have another intersection point with angle axis.Clamping length -10 times of nominal diameters of 2 times of nominal diameters,
30 degree of offset, clamping length are less than 2 times of nominal diameters, offset 5-10 degree.
Such as Fig. 4, slope offsetting：The line drawn is formed by connecting by limit point to more lower.Then torque is found
Curve and the maximum point of this air line distance, this point is exactly yield point.
Embodiment one：The present embodiment is that certain vehicle frame rails is connect with reinforcing plate, uses conventional hexagonal flange hook bolt
It is connect with Spiralock nut, measures installation torque, specific test method includes the following steps：
For the present embodiment in step S101, two parts of test position are single thickness plank, and longeron thickness 10mm reinforces
The pitch-dark processing of spray is done on plate thickness 7mm, material 510L, surface, and bolt specification M14x40,10.9 grades, nut must the locking spiral shell in jail to apply
Mother, bolt and nut surface treatment are environmentally friendly Dacroment.
In step s 102, the present embodiment connecting portion, real vehicle assembly is anchor stud head, and urgent nut influences to test
As a result it is the reinforcing plate to rub with nut, does not rub during urgent with the longeron end of threaded bolt contacts, each
There are 13 pilot hole positions in reinforcing plate, therefore, carries out this test and need reinforcing plate 1, longeron 1, bolt and nut each 13 altogether
It is each 4 (as shown in Figure 9) to additionally need auxiliary installation bolt nut for part.
In step s 103, the present embodiment institute union piece shape and structure is simple, and tooling can utilize assembly line to fix vehicle
The fixture of frame limits all degree of freedom of vehicle frame, and reinforcing plate is fixed on vehicle frame using the via hole position on connecting plate.Equipment is adopted
With Atlas CopCo DC tightening tools, adjustable and constant with rotating speed, data can store Downloadable function, tighten range
0-500N·m。
In step S104, the final torque of the present embodiment setting means is 400Nm, rotating speed 50RMP, and a step tightens.
In step S105, the present embodiment is according to the program set, it is desirable that operating personnel twist in accordance with assembly regulation enforcement
Tight operation after torque is increased to certain numerical value, no longer rises bolt and is broken, program terminates and preserves data automatically.
In step s 106, after the present embodiment is to be tested, switch board shows torque maximum in entire assembling process,
And torque-corner is automatically saved, torsion-time, a variety of curves such as torque-rotation speed connect switch board and PC using USB connecting lines
Client connects, and downloads rundown process torsion curve.
In step s 107, the present embodiment bolt has apparent constriction yield characteristics (as shown in Figure 10), judges the shape that fails
Formula is that bolt is surrendered or is broken, and according to the manual method for obtaining yield point, manually generates one and fits well on torsion curve line
The straight line in property section, the changed point of straight line is exactly yield point (as shown in figure 11).
In the embodiment of the present invention, the torque value read is as shown in table 2 below：
1 collected torque value (Nm) of table
In step S108, the present embodiment carries out data processing to collected surrender torque, as a result as shown in table 3 below.
2 torque value data processed result (unit Nm) of table
Dispersion：Standard deviation/average value, as a result as shown in table 4 below, respectively less than 10%, data consistency meets
It is required that；
3 dispersion result of calculation (unit Nm) of table
It calculates and recommends maximum torque：
Maximum value≤0.85x278=236.3Nm
According to calculated maximum value, normal value is found from operation card, the assembly torque of recommendation is：
200±30(N·m)
Verification
Minimum value=170 (Nm) of torque
Standard deviation=45 driving torque+3* (Nm)
It is bonded+3 standard deviation=107 of torque (Nm)
170>The greater (45,107) is met the requirements.
More than, the technical method of the present invention is described in detail in conjunction with specific embodiments, described specific implementation
Example assists in the understanding present invention.Any kind of threaded connection in practical applications, assembly torque can be according to we
Method tests to obtain.
Example the above is only the implementation of the present invention is not intended to limit the scope of the invention, every to utilize this hair
Equivalents made by bright specification and accompanying drawing content are applied directly or indirectly in relevant technical field, are similarly included in
In the scope of patent protection of the present invention.
Claims (7)
1. a kind of screw thread class fastener torque test method, it is characterised in that：Include the following steps：
Step S101：Obtain connector information and fits kind；
Step S102：It determines test sample quantity and gets ready the goods；
Step S103：Determine tooling and equipment；
Step S104：The final torque of setting means tightens strategy and rotating speed；
Step S105：It determines urgent end, screw element is tightened to Joint failure according to setting program；
Step S106：Collect rundown process torsion curve；
Step S107：According to failure mode, torque value is obtained；
Step S108：Data processing is carried out to torque value, determines assembly torque.
2. a kind of screw thread class fastener torque test method according to claim 1, it is characterised in that：In the step
In S101, the connector information includes connector material, surface treatment, thickness and fastener specification grade；The cooperation
Type includes that bolts and nuts mating connection structure, bolt and threaded hole mating connection structure and self threading pin and pre-manufactured hole coordinate
Connection.
3. a kind of screw thread class fastener torque test method according to claim 1, it is characterised in that：In the step
In S102, the sample coupon quantity is no less than ten groups.
4. a kind of screw thread class fastener torque test method according to claim 1, it is characterised in that：In the step
In S107, the failure mode includes bolt fracture, thread stripping etc..
5. a kind of screw thread class fastener torque test method according to claim 4, it is characterised in that：In the step
In S108, the data processing includes the following steps：
Extract the reference point on torsion curve；
It determines torque maximum and minimum value, calculates average value, standard value；
Dispersion；
It calculates and recommends maximum torque；
It is compared with normal value according to calculated maximum torque；
Verification.
6. a kind of screw thread class fastener torque test method according to claim 5, it is characterised in that：The step extraction
Reference point on torsion curve includes driving torque, fitting torque, surrender torque, ultimate torque.
7. a kind of screw thread class fastener torque test method according to claim 6, it is characterised in that：The extraction is turned round
The method of reference point on square-rotation curve includes taking point, tangential method, angle offset method and slope biasing means etc. manually.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810522822.4A CN108760531A (en) | 2018-05-28 | 2018-05-28 | A kind of screw thread class fastener torque test method |
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| CN201810522822.4A CN108760531A (en) | 2018-05-28 | 2018-05-28 | A kind of screw thread class fastener torque test method |
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| CN201810522822.4A Pending CN108760531A (en) | 2018-05-28 | 2018-05-28 | A kind of screw thread class fastener torque test method |
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Cited By (8)
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| CN111079865A (en) * | 2019-12-31 | 2020-04-28 | 联想(北京)有限公司 | Detection method and apparatus, electronic device, and medium |
| CN111537130A (en) * | 2020-04-24 | 2020-08-14 | 东软睿驰汽车技术（沈阳）有限公司 | Method and device for assembling battery standard parts |
| CN112765737A (en) * | 2020-12-29 | 2021-05-07 | 江铃汽车股份有限公司 | Method and system for designing threaded fastener |
| CN113203512A (en) * | 2021-03-16 | 2021-08-03 | 青海大学 | Method for monitoring attachment point |
| CN113743754A (en) * | 2021-08-24 | 2021-12-03 | 吉利汽车集团有限公司 | Automatic positioning method for tightening tool based on TC system |
| CN114398729A (en) * | 2021-12-25 | 2022-04-26 | 陕西法士特齿轮有限责任公司 | Shaft yield torque calculation method, tool, equipment and storage medium |
| 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 |
| CN114689233A (en) * | 2022-03-21 | 2022-07-01 | 中国航天标准化研究所 | Method for determining mounting torque of threaded fastener |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111079865A (en) * | 2019-12-31 | 2020-04-28 | 联想(北京)有限公司 | Detection method and apparatus, electronic device, and medium |
| CN111537130A (en) * | 2020-04-24 | 2020-08-14 | 东软睿驰汽车技术（沈阳）有限公司 | Method and device for assembling battery standard parts |
| CN111537130B (en) * | 2020-04-24 | 2022-01-04 | 东软睿驰汽车技术（沈阳）有限公司 | Method and device for assembling battery standard parts |
| CN112765737A (en) * | 2020-12-29 | 2021-05-07 | 江铃汽车股份有限公司 | Method and system for designing threaded fastener |
| CN113203512A (en) * | 2021-03-16 | 2021-08-03 | 青海大学 | Method for monitoring attachment point |
| CN113743754A (en) * | 2021-08-24 | 2021-12-03 | 吉利汽车集团有限公司 | Automatic positioning method for tightening tool based on TC system |
| CN114398729A (en) * | 2021-12-25 | 2022-04-26 | 陕西法士特齿轮有限责任公司 | Shaft yield torque calculation method, tool, equipment and storage medium |
| 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 |
| CN114689233A (en) * | 2022-03-21 | 2022-07-01 | 中国航天标准化研究所 | Method for determining mounting torque of threaded fastener |
| CN114689233B (en) * | 2022-03-21 | 2024-03-08 | 中国航天标准化研究所 | Method for determining installation torque of threaded fastener |
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