CN107895061A - The method for selecting of common-rail injector flat seal evaluation roughness parameter - Google Patents
The method for selecting of common-rail injector flat seal evaluation roughness parameter Download PDFInfo
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- CN107895061A CN107895061A CN201710938515.XA CN201710938515A CN107895061A CN 107895061 A CN107895061 A CN 107895061A CN 201710938515 A CN201710938515 A CN 201710938515A CN 107895061 A CN107895061 A CN 107895061A
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- roughness
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- rail injector
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
Abstract
The invention discloses the method for selecting of common-rail injector flat seal evaluation roughness parameter, including carrying out data processing to the roughness measurement result on fuel injector key components and parts high pressure sealing surface, make a transversal parallel to X-axis in the height of horizontal cross-section, so that its bearing length ratio reaches the contact rate size for meeting high-pressure tightness requirement, ask for the number for the closed area that transversal surrounds with roughness profile curve above it and its area of corresponding figure, characterization value using the average height of each closed figure as evaluation sealing surface " coarse " degree.The present invention is based on seepage theory, and the critical probability that seepage flow transformation occurs is applied in flat seal field, entirely different with existing roughness evaluation method, and parameters obtained can reflect that the sealing property of common-rail injector seal face is good and bad.Quality control is carried out to fuel injector sealing surfaces using assessment method provided by the invention, fuel injector can be made, which to produce the risk of leakage in seal face, to be reduced.
Description
Technical field
The present invention relates to internal combustion engine fuel injection system field, the especially evaluation of sealing surfaces pattern field, particularly one
The method for selecting of kind common-rail injector flat seal evaluation roughness parameter.
Background technology
For common-rail injector product, we always wish to go to evaluate its sealing with more appropriate surface characteristics parameter
Energy.
Some existing disclosed assessment methods quantitative to roughness, are mostly based on mathematical statistics rule opening relationships, and
The evaluation index used is different, puies forward roughness parameter and lacks and function of surface (such as sealing, contact stiffness, wearability
Deng) between corresponding relation, lack necessary theoretical foundation.In recent years, viewpoint thinks that machining surface has the base of point shape
Eigen, many scholars one after another using fractals, study it by this mathematical tool, but it is determined that fractal dimension calculates
Do not reach common understanding but in method.The method for being usually used in calculating fractal dimension mainly has box method, size method, covariance method, structure
Function method, R/S analytic approach, calculus of finite differences, power spectrum method and Wavelet Transform.There is scholar to compare above-mentioned several method,
In addition to Wavelet Transform, there is at least more than 5% error in fractal dimension obtained by remaining several computational methods with theoretical value, and
It is not strong for the adaptability of different size fractal dimension.The Wavelet Transform operation factors artificial in concrete operations are tied to calculating
Fruit can produce fluctuation, and the uniformity that fractal dimension is asked for using Wavelet Transform is not high.
At present, roughness parameter specified in national standard is relied only on to evaluate sealing, generally still simply
" roughness " of sealing surfaces is characterized using Ra parameters.It is easily found, the very remote sealing property of roughness profile gap is completely not
Ra value identical roughness curves together.While it is known that there is limitation in Ra parameters, it is impossible to directly right with the quality of sealing
Should, but suffer from and can not carry new a more evaluating for convincingness or method to substitute Ra.In engineer applied, still lack
A kind of weary roughness assessment method for accurately reflecting high pressure sealing surface quality.
Patent of the present invention is it is determined that before roughness assessment method, the sealer using seepage theory to mechanical structure surface
Reason is studied, and has drawn the relation between contact rate and sealing.According to eight connectivity seepage theory, theoretical critical fire area contact rate is
40.7%, that is to say, that for big system yardstick network, meet the rough surface of random distribution, contact rate reach 40.7% with
Sealing can be realized when upper.It is worthy of note that in practical application in engineering, due under limited dimensions, some small probability things
The contingency increase that part occurs,, can be with when such as leaking length dimension and being more than sealed width yardstick for different sealing surface structures
Increase contact rate ensures to meet seal request.
The content of the invention
In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a kind of common-rail injector is put down
The method for selecting of face sealing evaluation roughness parameter, the choosing of the common-rail injector flat seal evaluation roughness parameter
Determine method and theoretical research has been carried out to the sealing mechanism of plane sealing structure based on seepage principle, seepage flow is changed into critical probability mould
Type is applied to flat seal contact field, has obtained the relation between sealing and contact rate.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of method for selecting of common-rail injector flat seal evaluation roughness parameter, comprises the following steps.
Step 1, roughness profile data are chosen：On common-rail injector sealing surfaces to be evaluated, it is L to select a segment length
Seal face as sample length；Roughness measurement is carried out along sample length direction using roughness measurement equipment, and is used
After consistency profiles filtering, the cloud data in N number of Z-direction, as roughness profile data are obtained.
Step 2, roughness profile curve is formed：Using sample length direction as X-axis, the N number of Z side that will be obtained in step 1
Upward cloud data is plotted in X-Z coordinate systems, and the cloud data in N number of Z-direction is sequentially connected in order, that is, is formed
Roughness profile curve.
Step 3, transversal is drawn：Make a transversal parallel to X-axis in horizontal cross-section height Z=a positions so that branch
It is equal with contact rate δ to hold length rate Rmr (a), i.e. Rmr (a)=δ；Wherein, contact rate δ meets high-pressure tightness requirement, contact rate
δ spans are 30%~80%.
Step 4, the number k of target closed area is counted：The roughness wheel formed in transversal and step 2 in step 3
Wide curve encloses to form several closed areas, if disconnected transversal is surrounded with the roughness profile curve above disconnected transversal
A dry closed area is set as target closed area, and the number k of target closed area is counted.
Step 5, the average height R of k target closed area figure is asked forh, the RhAs selected common-rail injector plane
Sealing evaluation roughness parameter；RhExpression formula be：
Wherein, AiRepresent area corresponding to i-th of closed area figure in target closed area；liRepresent target enclosed area
Length of i-th of closed area figure on transversal in domain.
The number k of target closed area can be as the characterization value of evaluation rough surface spaced features, density degree；K values with
Meet following relational expression between sealed width W：
In formula, W refers to sealed width size, and L is sample length.
Contact rate δ values are 42%.
In the step 2, when the cloud data in N number of Z-direction connects, by the way of straight line or fitting of a polynomial.
In the step 1, common-rail injector sealing surfaces to be evaluated are oil injector body or needle-valve body sealing surfaces.
In the step 1, roughness measurement equipment is one-dimensional contact type measurement equipment or three-dimensional optical detection device.
In the step 1, roughness measurement equipment is 3 D non-contacting type optical profilometer.
After the present invention uses the above method, it the advantage is that：Sealing mechanism based on seepage principle to plane sealing structure
Theoretical research is carried out, seepage flow is changed into critical probability model is applied to flat seal contact field, has obtained sealing with connecing
Relation between the rate of touching.Based on above theory analysis, evaluated for sealing, the roughness valley below some critical value
Distribution is not have influential on sealing, and do not take statistics judgement to it.Parameter provided by the invention have easily obtain, stably, it is suitable
The advantages that answering property is good, it is particularly suitable for using in production practices.Using assessment method provided by the invention to fuel injector enclosed watch
Face carries out quality control, and fuel injector can be made, which to produce the risk of leakage in seal face, to be reduced.
Brief description of the drawings
Fig. 1 is the roughness profile curve drawn according to common-rail injector seal face roughness measurement data.
Fig. 2 is according to the intersection point feelings for meeting transversal that the contact rate of sealing requirements is made and roughness profile curve
Condition.
What Fig. 3 reflected is the situation for the target closed area that transversal surrounds with the roughness profile curve above it.
In Fig. 2, point M represents the intersection point of transversal and roughness profile curve, in addition, in figure, the numerical value list of X-axis and Z axis
Position is mm.
Embodiment
The present invention is further detailed explanation with specific better embodiment below in conjunction with the accompanying drawings.
A kind of method for selecting of common-rail injector flat seal evaluation roughness parameter, comprises the following steps.
Step 1, roughness profile data are chosen.
On common-rail injector sealing surfaces to be evaluated, on oil injector body or needle-valve body sealing surfaces, select one section long
The seal face for L is spent as sample length；Roughness measurement is carried out along sample length direction using roughness measurement equipment, and
After being filtered using consistency profiles, the cloud data in N number of Z-direction, as roughness profile data are obtained.
Above-mentioned roughness measurement equipment can be one-dimensional contact type measurement equipment, or three-dimensional optical detection device.
It is coarse to certain seal face of common-rail injector product using use 3 D non-contacting type optical profilometer in the present embodiment Fig. 1
Degree is detected, and after use mean line system (consistency profiles) filtering, is obtained the cloud data in N=1024 Z-direction, each put cloud
Data are absolute altitude value, and data lateral resolution is 0.821 μm, can calculate sample length L=1023*0.821/1000
=0.840mm.
Step 2, roughness profile curve is formed：Using sample length direction as X-axis, the N number of Z side that will be obtained in step 1
Upward cloud data is plotted in X-Z coordinate systems, and the cloud data in N number of Z-direction is preferably used into straight line or multinomial
The modes such as fitting are sequentially connected in order, that is, form roughness profile curve, the height of roughness profile curve in z-direction
Value is more than or equal to a.
In the present embodiment Fig. 1, the cloud data in 1024 Z-directions is connected using straight line, that is, is formed as shown in Figure 1 thick
Rugosity contour curve.
Step 3, transversal is drawn：Make a transversal parallel to X-axis in horizontal cross-section height Z=a positions so that branch
It is equal with contact rate δ to hold length rate Rmr (a), i.e. Rmr (a)=δ；Wherein, contact rate δ meets high-pressure tightness requirement, contact rate
δ spans are 30%~80%, and preferably value is 42%.
Fig. 2 be meet transversal that bearing length ratio Rmr (a)=42% makes and its with roughness profile curve in Fig. 1
Intersection point situation, transversal height Z=a=0.0064mm.
When above-mentioned transversal height Z=a value is asked for, matlab tool boxes can be used, it is corresponding by calculating different Z
Bearing length ratio obtain.Specifically, i.e., transversal height Z values are determined using searching algorithm.Z values initial value can be N number of
Height maxima Zmax in cloud data.
According to GBT3505-2009《Geometry Product Specification》In definition to profile bearing length ratio, i.e., in given water
The ratio of the solid material length sum and evaluation length of profile is cut in plane section height.Therefore, as Z=Zmax, that is, cut
When broken string is positioned at the top of whole roughness profile curve highest crest, fail to be truncated to any solid material, therefore during Z=Zmax
Bearing length ratio size be 0.
To accelerate search speed, set can be smaller than Zmax for initial value during practical operation.When transversal gradually reduces,
When i.e. Z values are gradually reduced, bearing length ratio value will gradually rise, and meet the contact rate of seal request until bearing length ratio reaches
Untill.For convenience of description, bearing length ratio corresponding to different Z is represented with symbol { Rmr (a)-Z }.
As Z=a, cut each section of physical profiles length l is asked fori, then sum after obtaining total physical profiles length
Divided by sample length L, income value are bearing length ratio size.It is formulated, is
Wherein, liRepresent length of i-th of closed area figure on transversal in target closed area.
Definition search cut-off tolerance is 0.05%, that is, is worked as | { Rmr (a)-Z } -42% | when≤0.05%, it is believed that Z now
For desired value.Double vertical lines in formula represent order of magnitude.
Embodied in its tangible table 1 of specific calculating process, willDivided by L=0.84, obtain
To δ=42.01%, error 0.01%, in the range of search ends tolerance.So when transversal height Z=a=
0.0064mm is desired value.
Step 4, the number k of target closed area is counted：The roughness wheel formed in transversal and step 2 in step 3
Wide curve encloses to form several closed areas, if disconnected transversal is surrounded with the roughness profile curve above disconnected transversal
A dry closed area is set as target closed area, and the number k of target closed area is counted.
What Fig. 3 reflected is the situation of the closed area that transversal surrounds with roughness profile curve above it in Fig. 2,
K=38 independent target closed areas are obtained.
Step 5, the average height R of k target closed area figure is asked forh, the RhAs selected common-rail injector plane
Sealing evaluation roughness parameter；RhExpression formula be：
Wherein, AiRepresent area corresponding to i-th of closed area figure in target closed area；liRepresent target enclosed area
Length of i-th of closed area figure on transversal in domain.
Defined from bearing length ratio,Can be by RhSign as evaluation sealing surface " coarse " degree
Value.
By each independent target closed area corresponds to the area of figure in Fig. 3 and the length data on transversal is listed in
In table 1.
Table 1
To liSummation understands that it meets that contact rate defines.Each region area divided by its correspondence are blocked into line length, obtained each
The height equivlent R in regioni, average height R is obtained after being averaging to ith=0.01158477.
The bearing length ratio acquiring method that is related in above example, closed area graphics area acquiring method etc. are
Completed by being programmed in certain general mathematical tool box.
In addition, the number k of target closed area can be as the characterization value of evaluation rough surface spaced features, density degree；k
Meet following relational expression between value and sealed width W：
In formula, W refers to sealed width size, and L is sample length, and in specifically evaluation sealing surface quality, Rh parameters are preferred
Level is higher than k.When the seepage flow transition probabilities of seepage theory are taken on concrete engineering to use, exist to mesh scale and require.
50 be according to calculate, experiment, a lower limit taking of testing result, can be to sealed width and sealing surfaces according to the formula
K values claim.
The preferred embodiment of the present invention described in detail above, still, the present invention are not limited in above-mentioned embodiment
Detail, in the range of the technology design of the present invention, a variety of equivalents can be carried out to technical scheme, this
A little equivalents belong to protection scope of the present invention.
Claims (7)
- A kind of 1. method for selecting of common-rail injector flat seal evaluation roughness parameter, it is characterised in that：Including as follows Step：Step 1, roughness profile data are chosen：On common-rail injector sealing surfaces to be evaluated, it is the close of L to select a segment length End-blocking face is as sample length；Roughness measurement is carried out along sample length direction using roughness measurement equipment, and uses profile After method filtering, the cloud data in N number of Z-direction, as roughness profile data are obtained；Step 2, roughness profile curve is formed：Using sample length direction as X-axis, by the N number of Z-direction obtained in step 1 Cloud data be plotted in X-Z coordinate systems, and the cloud data in N number of Z-direction is sequentially connected in order, that is, formed coarse Spend contour curve；Step 3, transversal is drawn：Make a transversal parallel to X-axis in horizontal cross-section height Z=a positions so that supporting length Degree rate Rmr (a) is equal with contact rate δ, i.e. Rmr (a)=δ；Wherein, contact rate δ meets high-pressure tightness requirement, and contact rate δ takes It is 30%~80% to be worth scope；Step 4, the number k of target closed area is counted：The roughness profile formed in transversal and step 2 in step 3 is bent Line encloses to form several closed areas, disconnected transversal and the roughness profile curve above disconnected transversal are surrounded several Closed area is set as target closed area, and the number k of target closed area is counted；Step 5, the average height R of k target closed area figure is asked forh, the RhAs selected common-rail injector flat seal Property evaluation roughness parameter；RhExpression formula be：<mrow> <msub> <mi>R</mi> <mi>h</mi> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <mi>k</mi> </mfrac> <msubsup> <mi>&Sigma;</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>k</mi> </msubsup> <mfrac> <msub> <mi>A</mi> <mi>i</mi> </msub> <msub> <mi>l</mi> <mi>i</mi> </msub> </mfrac> </mrow>Wherein, AiRepresent area corresponding to i-th of closed area figure in target closed area；liRepresent in target closed area Length of i-th of closed area figure on transversal.
- 2. the method for selecting of common-rail injector flat seal evaluation roughness parameter according to claim 1, it is special Sign is：The number k of target closed area can be as the characterization value of evaluation rough surface spaced features, density degree；K values with it is close Meet following relational expression between envelope width W：<mrow> <mfrac> <mi>w</mi> <mi>L</mi> </mfrac> <mo>*</mo> <mi>k</mi> <mo>&GreaterEqual;</mo> <mn>50</mn> </mrow>In formula, W refers to sealed width size, and L is sample length.
- 3. the method for selecting of common-rail injector flat seal evaluation roughness parameter according to claim 1, it is special Sign is：Contact rate δ values are 42%.
- 4. the method for selecting of common-rail injector flat seal evaluation roughness parameter according to claim 1, it is special Sign is：In the step 2, when the cloud data in N number of Z-direction connects, by the way of straight line or fitting of a polynomial.
- 5. the method for selecting of common-rail injector flat seal evaluation roughness parameter according to claim 1, it is special Sign is：In the step 1, common-rail injector sealing surfaces to be evaluated are oil injector body or needle-valve body sealing surfaces.
- 6. the method for selecting of common-rail injector flat seal evaluation roughness parameter according to claim 1, it is special Sign is：In the step 1, roughness measurement equipment is one-dimensional contact type measurement equipment or three-dimensional optical detection device.
- 7. the method for selecting of common-rail injector flat seal evaluation roughness parameter according to claim 6, it is special Sign is：In the step 1, roughness measurement equipment is 3 D non-contacting type optical profilometer.
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