CN106339589A - Method and system for selecting thread fastener - Google Patents
Method and system for selecting thread fastener Download PDFInfo
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- CN106339589A CN106339589A CN201610730241.0A CN201610730241A CN106339589A CN 106339589 A CN106339589 A CN 106339589A CN 201610730241 A CN201610730241 A CN 201610730241A CN 106339589 A CN106339589 A CN 106339589A
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- G—PHYSICS
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Abstract
The invention discloses a method for selecting a thread fastener. The method comprises the following steps of calculating a first maximum torque of the pre-selected thread fastener under the condition of no crashing; using a torque calculation formula to calculate a second maximum torque of the pre-selected thread fastener; when the first maximum torque is not smaller than the second maximum torque, selecting the pre-selected thread fastener. The method has the advantages that the simplicity and practicality are realized, the calculation efficiency is high, and the practicality is strong. The invention also discloses a system for selecting the thread fastener, so as to reach the effects.
Description
Technical field
The present invention relates to Vehicle Engineering, particularly to a kind of system of selection of threaded fastener and system.
Background technology
In parts exploitation design process at this stage, the standard component selecting which kind of model for parts is pacified
Dress, majority is with reference to market ripe.Due to the difference on parts workmanship and assembly technology, the standard component type of borrow
Number whether rationally there is query.
Have complicated to the computational methods of threaded fastener tightening torque in the installation drawing of current vehicle body subgroup again, be related to
Thread parameter more, reduce the practicality of calculating speed and regulation.
Therefore, how to be fast and accurately threadably secured the selection of part, be the skill that those skilled in the art need to solve
Art problem.
Content of the invention
It is an object of the invention to provide a kind of system of selection of threaded fastener, the method is simple and practical, and computational efficiency is high,
Practical；Present invention also offers the selection system of threaded fastener.
For solving above-mentioned technical problem, the present invention provides a kind of system of selection of threaded fastener, comprising:
Calculate pre-selection threaded fastener not by beat routed under conditions of the first peak torque；
Calculate the second peak torque of described pre-selection threaded fastener using torque arithmetic formula；
When described first peak torque is not less than described second peak torque, select described pre-selection threaded fastener.
Wherein, calculate pre-selection threaded fastener not by beat routed under conditions of the first peak torque, comprising:
UsingCalculate pre-selection threaded fastener not by beat routed under conditions of the
One peak torque；
Wherein, tc,maxFor the first peak torque, dwEquivalent diameter for supporting surface friction torque.
Wherein, calculate pre-selection threaded fastener not by beat routed under conditions of the first peak torque, comprising:
When the bearing-surface of contact is circular, using tc,max=0.1596d2Calculate pre-selection threaded fastener do not beaten
The first peak torque under conditions of bursting；
Wherein, tc,maxFor the first peak torque, d is the basic size in the big footpath of external screw thread.
Wherein, the second peak torque of described pre-selection threaded fastener is calculated using torque arithmetic formula, comprising:
Basic size d defining the abbreviation pitch diameter of thread according to gb/t 1962, obtain d2For d-ap；
Equivalent diameter d using d abbreviation supporting surface friction torquew, obtain dwFor bd；
Using tf,max=[0.16*p+0.58*us,min*(d-ap)+0.5*μw,min*bd]*ff,maxCalculate described pre-selection screw thread
Second peak torque of securing member；
Wherein, tf,maxFor the second peak torque, μw,min、us,minFor supporting surface coefficient of friction, ff,maxFor maximum pretightning force, d
For the basic size in the big footpath of external screw thread, p is pitch, and a, b are real number.
Wherein, the second peak torque of described pre-selection threaded fastener is calculated using torque arithmetic formula, comprising:
Using tf,max=[0.16*p+0.58*us,min*(d-0.65p)+0.0797*d]*ff,maxCalculate described pre-selection screw thread
Second peak torque of securing member；Wherein, a takes 0.65, b to take 1.594, us,minTake 0.1.
The present invention also provides a kind of selection system of threaded fastener, comprising:
First computing module, for calculate pre-selection threaded fastener not by beat routed under conditions of the first peak torque；
Second computing module, for calculating the second maximum torsion of described pre-selection threaded fastener using torque arithmetic formula
Square；
Option module, for when described first peak torque is not less than described second peak torque, selecting described pre-selection
Threaded fastener.
Wherein, described first computing module is specially and utilizesCalculate pre-selection screw thread tight
Firmware is in the module of the first peak torque do not beaten under conditions of bursting；
Wherein, tc,maxFor the first peak torque, dwEquivalent diameter for supporting surface friction torque.
Wherein, described first computing module is specially when the bearing-surface of contact is circular, using tc,max=
0.1596d2Calculate the module in the first peak torque do not beaten under conditions of bursting for the pre-selection threaded fastener；
Wherein, tc,maxFor the first peak torque, d is the basic size in the big footpath of external screw thread.
Wherein, described second computing module, comprising:
Abbreviation unit, for basic size d defining the abbreviation pitch diameter of thread according to gb/t 1962, obtain d2For d-ap；
Equivalent diameter d using d abbreviation supporting surface friction torquew, obtain dwFor bd；
Second computing unit, for utilizing tf,max=[0.16*p+0.58*us,min*(d-ap)+0.5*μw,min*bd]*
ff,maxCalculate the second peak torque of described pre-selection threaded fastener；
Wherein, tf,maxFor the second peak torque, μw,min、us,minFor supporting surface coefficient of friction, ff,maxFor maximum pretightning force, d
For the basic size in the big footpath of external screw thread, p is pitch, and a, b are real number.
Wherein, described second calculating is single specially utilizes tf,max=[0.16*p+0.58*us,min*(d-0.65p)+
0.0797*d]*ff,maxCalculate the unit of the second peak torque of described pre-selection threaded fastener；Wherein, a takes 0.65, b to take
1.594, us,minTake 0.1.
The system of selection of threaded fastener provided by the present invention, will avoid threaded fastener beat burst under the conditions of can hold
The peak torque being subject to is the peak torque of the first peak torque and theoretical calculation is that the second peak torque is compared, if theoretical
Calculated value is more than to be prevented from beating the maximum torque that can bear of bursting, then illustrate that the standard component preselecting is unreasonable, need to reselect；
The method is simple and practical, and computational efficiency is high, practical；Present invention also offers the selection system of threaded fastener, have on
State beneficial effect, will not be described here.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing providing obtains other accompanying drawings.
The flow chart of the system of selection of the threaded fastener that Fig. 1 is provided by the embodiment of the present invention；
The structured flowchart of the selection system of the threaded fastener that Fig. 2 is provided by the embodiment of the present invention.
Specific embodiment
The core of the present invention is to provide a kind of system of selection of threaded fastener, and the method is simple and practical, and computational efficiency is high,
Practical；Present invention also offers the selection system of threaded fastener.
Purpose, technical scheme and advantage for making the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described it is clear that described embodiment is
The a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment being obtained under the premise of not making creative work, broadly falls into the scope of protection of the invention.
Refer to Fig. 1, the flow chart of the system of selection of the threaded fastener that Fig. 1 is provided by the embodiment of the present invention；The party
Method may include that
S100, calculate pre-selection threaded fastener not by beat routed under conditions of the first peak torque；
Wherein, here when calculating the first peak torque, need to be entered according to the situation of pre-selection threaded fastener installation site
Row calculates；Abbreviation can be carried out to computing formula further for the speed improving when calculating, bearing-surface during abbreviation, can be considered
Shape, if there is the conditions such as the form of packing ring and packing ring and carry out abbreviation.The acquisition of calculating parameter can significantly be reduced
Difficulty and the efficiency of calculating.Here threaded fastener can be automobile-used threaded fastener, and the material of threaded fastener
Can be plastics.
Optionally, utilizeCalculate pre-selection threaded fastener and do not beaten the condition burst
Under the first peak torque；
Wherein, tc,maxFor the first peak torque, dwEquivalent diameter for supporting surface friction torque.
Determined when calculating the first peak torque of pre-selection threaded fastener it is only necessary to obtain d by above-mentioned formulawI.e.
Can.In order to further abbreviation be carried out i.e. to d to above-mentioned formulawCarry out abbreviation, carry in the case of acceptable computational accuracy
Computationally efficient.For example when the bearing-surface of contact is circular:
Wherein, dwFor supporting surface or washer face diameter, dhFor bolt or screwing through hole diameter.
Can continue to dw、dhSimplified: dh=1.1*d, the d when packing ring is for plain washerw=2.2*d, when supporting surface is
D during non-packing ringw=2.0*d (or empirically being simplified).Due to more than current product from the standard component for not belt washer, because
This can be reduced to use dw=2.0*d is to dwSimplified, at this momentWork as contact
Bearing-surface be circular when, using tc,max=0.1596d2Calculate pre-selection threaded fastener not by beat routed under conditions of the
One peak torque；Wherein, tc,maxFor the first peak torque, d is the basic size in the big footpath of external screw thread.
Be exemplified below above-mentioned formula calculating feasibility:
: find d from car gage part handbook taking q1860616 as a examplew=12.2, according to gb/t 5277
In to medium assembly precision require under bolt, screwing through hole diametric requirements, dh=6.6, theoretical according to above formulaCalculate tc,max=5.885.With simplification algorithm tc,Max=0.1596d2It is calculated
tc,max=5.744；Calculating deviation is -2.4%.
S110, using torque arithmetic formula calculate described pre-selection threaded fastener the second peak torque；
Wherein, the definition according to qc/t 518-2013 version regulation, the automobile calculating side of threaded fastener tightening torque
Method is as follows: in elastic region, tightening torque and the relation of pretightning force are shown below:
tf=k*ff* d, wherein, k torque coefficient, ffPretightning force；It is calculated the second peak torque tf,max=kmin*
ff,max*d.Wherein, the fundamental formular of k is shown below:
K=[0.16*p+0.58* μs*d2+0.5*μw*dw]/d
I.e. minimal torque coefficient is:
But this parameters of formula is more, and the calculating of parameter is more complicated, can be according to the demand pair of Practical Calculation precision
Above-mentioned parameter carries out abbreviation, and process can be such that
dw(equivalent diameter of supporting surface friction torque) simplifies for example when the bearing-surface of contact is circular:
Wherein, dwFor supporting surface or washer face diameter, dhFor bolt or screwing through hole diameter.
Can continue to dw、dhSimplified: dh=1.1*d, the d when packing ring is for plain washerw=2.2*d, when supporting surface is
D during non-packing ringw=2.0*d (or empirically being simplified).Therefore, it can utilize dwAnd dhRelation and d between
Letter, can obtain dwFor bd；The d that the value of b is chosen with userwAnd dhRelation between d is relevant, for example current product multiselect
With the standard component for not belt washer, therefore can be reduced to use dw=2.0*d is to dwSimplified, obtained dw=1.594*d.I.e. b
Value is 1.594.
d2(basic size of the pitch diameter of thread) simplifies:
Definition according to gb/t 196: d2=d-0.6495*p, 0.6495 can enter according to the selection of computational accuracy here
Row simplification can think a, and wherein, a is real number, and the value of such as a can be any real number between 0.64 to 0.65.For example carry out four
The value that house five enters then a is 0.65.
uw,min(supporting surface coefficient of friction) simplifies:
A.2, supporting surface coefficient of friction is commonly used according to qc/t 518-2007 version, to uw,minSimplified, when supporting surface no
During lubricant, uw,minTake 0.10, when supporting surface has lubricant, uw,minTake 0.08.General vehicle body screw thread is installed as unlubricated
Installation under the conditions of agent, therefore generally uw,minCan unify to take 0.10.If abbreviation not carried out to this parameter, then can lead to
Cross acquisition concrete numerical value of tabling look-up.
Maximum pretightning force ff,maxBy acquisition of tabling look-up, two kinds of situations can be divided into during tabling look-up:
(1) work as ds≥drWhen, ff,maxRegulation by qc/t 518-2013 table 1.Wherein:
d3=d1-0.144375*p≈d1-0.14*p
Definition according to gb/t 196:
d1=d-1.0825*p ≈ d-1.08*p
D is obtained according to above formular=d-0.935*p, dsFound by car gage part handbook.
(2) work as ds=0.9d3When, ff,maxRegulation by qc/t 518-2013 table 2.
I.e. optional, the second peak torque of described pre-selection threaded fastener is calculated using torque arithmetic formula, comprising:
Basic size d defining the abbreviation pitch diameter of thread according to gb/t 1962, obtain d2For d-ap；
Equivalent diameter d using d abbreviation supporting surface friction torquew, obtain dwFor bd；
Using tf,max=[0.16*p+0.58*us,min*(d-ap)+0.5*μw,min*bd]*ff,maxCalculate described pre-selection screw thread
Second peak torque of securing member；
Wherein, tf,maxFor the second peak torque, μw,min、us,minFor supporting surface coefficient of friction, ff,maxFor maximum pretightning force, d
For the basic size in the big footpath of external screw thread, p is pitch, and a, b are real number.
When a takes 0.65, b to take 1.594, us,minWhen taking 0.1, simplification of a formula is tf,max=[0.16*p+0.58*us,min*(d-
0.65p)+0.0797*d]*ff,max；Wherein, d, p are known, us,min、ff,maxFound by car gage part handbook.
Be exemplified below above-mentioned formula calculating feasibility:
Citing carries out calculating t according to the method described abovef,max: find d from car gage part taking q1860616 as a examplew=
12.2, according to the bolt under medium assembly precision being required in gb/t 5277, screwing through hole diametric requirements, dh=6.6, actual
It is calculated minimal torque coefficient: 0.164, using simplifying algorithm tf,max=[0.16*p+0.58*us,min*(d-0.65p)+
0.0797*d]*ff,maxObtain minimal torque coefficient: 0.163.Calculation error -0.61%.
S120, when described first peak torque be not less than described second peak torque when, select described pre-selection screw threads for fastening
Part.
Wherein, when described first peak torque is not less than described second peak torque, select described pre-selection screw threads for fastening
Part, otherwise reselects.On the basis of keeping the first peak torque constant, can consider to reduce by second from following several respects
High pulling torque: (1) standard component surface treatment mode；(2) mechanical performance grade；(3) pitch.So that further reasonably to tf,maxEnter
Row simplifies, and improves computation rate, lifts practicality.
The method can also be by preselecting the installation situation of threaded fastener as according to the letter to parameters of formula further
Change process or value are modified, to improve accuracy and the reliability of option.
Based on technique scheme, the system of selection of threaded fastener provided in an embodiment of the present invention, screw thread will avoided
The peak torque that securing member beats that the peak torque that can bear under the conditions of bursting is the first peak torque and theoretical calculation is second
High pulling torque is compared and has carried out rational abbreviation to the parameter in formula under conditions of ensureing demand computational accuracy, improves
The practicality of computational efficiency and formula, if calculated value is more than preventing from beating the maximum torque that can bear of bursting, says
The standard component of bright pre-selection is unreasonable, needs to reselect；The method is simple and practical, and computational efficiency is high, practical.
Below the selection system of threaded fastener provided in an embodiment of the present invention is introduced, screw thread described below is tight
The selection system of firmware and the system of selection of threaded fastener can be mutually to should refer to.
Refer to Fig. 2, the structured flowchart of the selection system of the threaded fastener that Fig. 2 is provided by the embodiment of the present invention；Should
System may include that
First computing module 100, is not being turned round by the first maximum beaten under conditions of bursting for calculating pre-selection threaded fastener
Square；
Second computing module 200, for calculating the second maximum of described pre-selection threaded fastener using torque arithmetic formula
Moment of torsion；
Option module 300, for when described first peak torque is not less than described second peak torque, selecting described pre-
Select threaded fastener.
Optionally, described first computing module 100 is specially and utilizesCalculate pre-selection
Threaded fastener is in the module of the first peak torque do not beaten under conditions of bursting；
Wherein, tc,maxFor the first peak torque, dwEquivalent diameter for supporting surface friction torque.
Optionally, described first computing module 100 is specially when the bearing-surface of contact is circular, using tc,max=
0.1596d2Calculate the module in the first peak torque do not beaten under conditions of bursting for the pre-selection threaded fastener；
Wherein, tc,maxFor the first peak torque, d is the basic size in the big footpath of external screw thread.
Optionally, described second computing module 200, comprising:
Abbreviation unit, for basic size d defining the abbreviation pitch diameter of thread according to gb/t 1962, obtain d2For d-ap；
Equivalent diameter d using d abbreviation supporting surface friction torquew, obtain dwFor bd；
Second computing unit, for utilizing tf,max=[0.16*p+0.58*us,min*(d-ap)+0.5*μw,min*bd]*
ff,maxCalculate the second peak torque of described pre-selection threaded fastener；
Wherein, tf,maxFor the second peak torque, μw,min、us,minFor supporting surface coefficient of friction, ff,maxFor maximum pretightning force, d
For the basic size in the big footpath of external screw thread, p is pitch, and a, b are real number.
Optionally, described second computing unit specially utilizes tf,max=[0.16*p+0.58*us,min*(d-0.65p)+
0.0797*d]*ff,maxCalculate the unit of the second peak torque of described pre-selection threaded fastener；Wherein, a takes 0.65, b to take
1.594, us,minTake 0.1.
In specification, each embodiment is described by the way of going forward one by one, and what each embodiment stressed is real with other
Apply the difference of example, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
Speech, because it corresponds to the method disclosed in Example, so description is fairly simple, referring to method part illustration in place of correlation
?.
Professional further appreciates that, in conjunction with the unit of each example of the embodiments described herein description
And algorithm steps, can with electronic hardware, computer software or the two be implemented in combination in, in order to clearly demonstrate hardware and
The interchangeability of software, generally describes composition and the step of each example in the above description according to function.These
Function to be executed with hardware or software mode actually, the application-specific depending on technical scheme and design constraint.Specialty
Technical staff can use different methods to each specific application realize described function, but this realization should
Think beyond the scope of this invention.
The step of the method in conjunction with the embodiments described herein description or algorithm can directly be held with hardware, processor
The software module of row, or the combination of the two is implementing.Software module can be placed in random access memory (ram), internal memory, read-only deposit
Reservoir (rom), electrically programmable rom, electrically erasable rom, register, hard disk, moveable magnetic disc, cd-rom or technology
In known any other form of storage medium in field.
System of selection and system to threaded fastener provided by the present invention are described in detail above.Herein should
With specific case, the principle of the present invention and embodiment are set forth, the explanation of above example is only intended to help reason
The solution method of the present invention and its core concept.It should be pointed out that for those skilled in the art, without departing from
On the premise of the principle of the invention, the present invention can also be carried out with some improvement and modify, these improve and modification also falls into this
In bright scope of the claims.
Claims (10)
1. a kind of system of selection of threaded fastener is it is characterised in that include:
Calculate pre-selection threaded fastener not by beat routed under conditions of the first peak torque；
Calculate the second peak torque of described pre-selection threaded fastener using torque arithmetic formula；
When described first peak torque is not less than described second peak torque, select described pre-selection threaded fastener.
2. the system of selection of threaded fastener according to claim 1 exists it is characterised in that calculating pre-selection threaded fastener
Not by beat burst under conditions of the first peak torque, comprising:
UsingCalculate pre-selection threaded fastener not by beat burst under conditions of first maximum
Moment of torsion；
Wherein, tc,maxFor the first peak torque, dwEquivalent diameter for supporting surface friction torque.
3. the system of selection of threaded fastener according to claim 1 exists it is characterised in that calculating pre-selection threaded fastener
Not by beat burst under conditions of the first peak torque, comprising:
When the bearing-surface of contact is circular, using tc,max=0.1596d2Calculate pre-selection threaded fastener do not beaten routed
Under the conditions of the first peak torque；
Wherein, tc,maxFor the first peak torque, d is the basic size in the big footpath of external screw thread.
4. the system of selection of threaded fastener according to claim 1 is it is characterised in that calculated using torque arithmetic formula
Second peak torque of described pre-selection threaded fastener, comprising:
Basic size d defining the abbreviation pitch diameter of thread according to gb/t 1962, obtain d2For d-ap；
Equivalent diameter d using d abbreviation supporting surface friction torquew, obtain dwFor bd；
Using tf,max=[0.16*p+0.58*us,min*(d-ap)+0.5*μw,min*bd]*ff,maxCalculate described pre-selection screw threads for fastening
Second peak torque of part；
Wherein, tf,maxFor the second peak torque, μw,min、us,minFor supporting surface coefficient of friction, ff,maxFor maximum pretightning force, d is outer
The basic size of Major Diam, p is pitch, and a, b are real number.
5. the system of selection of threaded fastener according to claim 5 is it is characterised in that calculated using torque arithmetic formula
Second peak torque of described pre-selection threaded fastener, comprising:
Using tf,max=[0.16*p+0.58*us,min*(d-0.65p)+0.0797*d]*ff,maxCalculate described pre-selection screw threads for fastening
Second peak torque of part；Wherein, a takes 0.65, b to take 1.594, us,minTake 0.1.
6. a kind of selection system of threaded fastener is it is characterised in that include:
First computing module, for calculate pre-selection threaded fastener not by beat routed under conditions of the first peak torque；
Second computing module, for calculating the second peak torque of described pre-selection threaded fastener using torque arithmetic formula；
Option module, for when described first peak torque is not less than described second peak torque, selecting described pre-selection screw thread
Securing member.
7. the selection system of threaded fastener according to claim 6 is it is characterised in that described first computing module is concrete
It is utilizationCalculate pre-selection threaded fastener not by beat burst under conditions of first maximum
The module of moment of torsion；
Wherein, tc,maxFor the first peak torque, dwEquivalent diameter for supporting surface friction torque.
8. the selection system of threaded fastener according to claim 6 is it is characterised in that described first computing module is concrete
It is when the bearing-surface of contact is circular, using tc,max=0.1596d2Calculate pre-selection threaded fastener and do not beaten the bar burst
The module of the first peak torque under part；
Wherein, tc,maxFor the first peak torque, d is the basic size in the big footpath of external screw thread.
9. the selection system of threaded fastener according to claim 6, it is characterised in that described second computing module, is wrapped
Include:
Abbreviation unit, for basic size d defining the abbreviation pitch diameter of thread according to gb/t 1962, obtain d2For d-ap；Using d
The equivalent diameter d of abbreviation supporting surface friction torquew, obtain dwFor bd；
Second computing unit, for utilizing tf,max=[0.16*p+0.58*us,min*(d-ap)+0.5*μw,min*bd]*ff,maxMeter
Calculate the second peak torque of described pre-selection threaded fastener；
Wherein, tf,maxFor the second peak torque, μw,min、us,minFor supporting surface coefficient of friction, ff,maxFor maximum pretightning force, d is outer
The basic size of Major Diam, p is pitch, and a, b are real number.
10. the selection system of threaded fastener according to claim 9 is it is characterised in that described second computing unit has
Body is to utilize tf,max=[0.16*p+0.58*us,min*(d-0.65p)+0.0797*d]*ff,maxCalculate described pre-selection screw threads for fastening
The unit of the second peak torque of part；Wherein, a takes 0.65, b to take 1.594, us,minTake 0.1.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110688734A (en) * | 2019-08-29 | 2020-01-14 | 湖南猎豹汽车股份有限公司 | Design method of tightening torque |
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|---|---|---|---|---|
| CN110688734A (en) * | 2019-08-29 | 2020-01-14 | 湖南猎豹汽车股份有限公司 | Design method of tightening torque |
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