CN107504928B - The datum level of cooperation curved surface determines method - Google Patents
The datum level of cooperation curved surface determines method Download PDFInfo
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- CN107504928B CN107504928B CN201710344922.8A CN201710344922A CN107504928B CN 107504928 B CN107504928 B CN 107504928B CN 201710344922 A CN201710344922 A CN 201710344922A CN 107504928 B CN107504928 B CN 107504928B
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000005259 measurement Methods 0.000 claims abstract description 102
- 238000004088 simulation Methods 0.000 claims abstract description 48
- 230000004075 alteration Effects 0.000 claims description 41
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/16—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring distance of clearance between spaced objects
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- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
This disclosure relates to which a kind of datum level for cooperating curved surface determines method, it include: to simulate to determine step, the simulation datum level in the first cooperation curved surface and the second cooperation curved surface is determined by analogue measurement face difference, survey selected step, the selected reference face in the first cooperation curved surface and the second cooperation curved surface is determined by Entity measurement face difference, when simulation datum level is different cooperation curved surfaces from selected reference face, simulation translation first, which cooperates curved surface or the second cooperation curved surface and re-starts simulation, determines step and the selected step of actual measurement, when simulation datum level and selected reference face are same cooperation curved surface, it determines simulation datum level or selected reference face is target fiducials face.The disclosure determines datum level by way of it will simulate and determine and survey selected combine come final, issuable error in one of situation can be eliminated, so as to accurately determine datum level, be conducive to the measurement of subsequent face difference, and then convenient for subsequent assembly, detection etc..
Description
Technical field
This disclosure relates to vehicle manufacture field, and in particular, to it is a kind of cooperate curved surface datum level determine method.
Background technique
Along with the diversification of social popularity's element, more popular linear structures are applied to new product by vapour shape-designing teacher
In moulding, while in vehicle production manufacture, the progress of the manufacturing process, special equipment manufacture level such as punching press, welding is more complicated
Changeable curved surface is embodied and is realized on vehicle.
In vehicle component assembly, it is thus necessary to determine that face difference or gap between complex-curved, to be adjusted.So-called face
Difference is exactly distance of two curved surfaces in curved surface normal orientation.In general, first having to determine when measuring complex-curved face difference
Benchmark or datum level.However, Dimension Engineering teacher is often difficult to determine using which curved surface as benchmark, with which in selection of datum
A curved surface as measured surface could most accurate finished surface difference or gap measurement.Its reason includes: to cooperate the section of curved surface more
Become, measuring device is placed, and datum level usable area is small and the face difference measurement data of manual measurement is discrete larger etc..Due to
Upper reason causes the data of matching effect in kind and measurement inconsistent, and matching engineer is unable to judge accurately size technologies specification
(Dimensional Technical Specification, DTS) overproof reason, while accurate components can not be provided
Recommendation on improvement value.
Summary of the invention
Purpose of this disclosure is to provide a kind of choosing method of datum level, the choosing method of the datum level can accurately really
Datum level is determined, to be conducive to the measurement of subsequent face difference.
To achieve the goals above, the datum level that the disclosure provides a kind of cooperation curved surface determines method, and the datum level is true
The method of determining includes: to simulate to determine step, is determined in the first cooperation curved surface and the second cooperation curved surface by analogue measurement face difference
Datum level is simulated, selected step is surveyed, is determined in the first cooperation curved surface and the second cooperation curved surface by Entity measurement face difference
Selected reference face, when the simulation datum level is different cooperation curved surfaces, simulation translation described first from the selected reference face
Cooperation curved surface or the second cooperation curved surface simultaneously re-start the determining step of the simulation and the selected step of the actual measurement, when described
Simulating datum level and the selected reference face is same cooperation curved surface, determines the simulation datum level or the selected reference face is
Target fiducials face.
Optionally, the simulation determine step be included in three-dimensional software creation and meanwhile intercept the first cooperation curved surface with
The fit clearance of the section of the second cooperation curved surface, the section and the first cooperation curved surface and the second cooperation curved surface is perpendicular,
Analogue measurement face difference obtains in the section.
Optionally, the simulation determine step include: in the section, on the basis of the first cooperation curved surface, measurement the
First face aberration measurements of one cooperation curved surface and the second cooperation curved surface, on the basis of the second cooperation curved surface, the first cooperation of measurement is bent
The second face aberration measurements in face and the second cooperation curved surface, calculate the first difference of first face aberration measurements and face difference preset value
With the second difference of second face aberration measurements and face difference preset value, when first difference absolute value be less than or equal to institute
The absolute value for stating the second difference determines the first cooperation curved surface for simulation datum level, when the absolute value of first difference is greater than institute
The absolute value for stating the second difference determines the second cooperation curved surface for simulation datum level.
Optionally, the simulation determines that step includes: the multiple sections of creation, in each section, with first
On the basis of cooperating curved surface, measurement first cooperates the first face aberration measurements between curved surface and the second cooperation curved surface, with the second cooperation
On the basis of curved surface, the second face aberration measurements between the first cooperation curved surface of measurement and the second cooperation curved surface calculate multiple described the
First mean difference of the first face difference average value and face difference preset value of one face aberration measurements calculates multiple second face differences and surveys
Second mean difference of the second face difference average value and face difference preset value of magnitude, when the absolute value of first mean difference is less than
Or the absolute value equal to second mean difference, the first cooperation curved surface is determined for simulation datum level, when first mean difference
The absolute value of value is greater than the absolute value of second mean difference, determines the second cooperation curved surface for simulation datum level.
Optionally, measurement first face aberration measurements include: that choose the point of contact at the angle R of the first cooperation curved surface be the
One point of contact is chosen the first basic point on the first cooperation curved surface with first point of contact at a distance of the first length, is cut by first
Point and the first basic point generate the first straight line for extending to the second cooperation curved surface, choose the angle R of the second cooperation curved surface
Point of contact is the second point of contact, and the vertical range at second point of contact to the first straight line is first face aberration measurements.
Optionally, measurement second face aberration measurements include: and choose to cut on the second cooperation curved surface with described second
Point extends to first cooperation by second point of contact and second basic point generation at a distance of the second basic point of the second length
The second straight line of curved surface, the vertical range at first point of contact to the second straight line are second face aberration measurements.
Optionally, first length is equal to second length.
Optionally, the edge for avoiding the first cooperation curved surface and the second cooperation curved surface creates the section.
Optionally, the selected step of the actual measurement includes: to measure first on the basis of the first cooperation curved surface using face difference cubing
The the first face difference for cooperating curved surface and the second cooperation curved surface, the first cooperation of measurement curved surface and second on the basis of the second cooperation curved surface
Cooperate the second face difference of curved surface, calculates first face difference and the first deviation of face difference preset value and second face are poor
Second deviation of value and face difference preset value, when the absolute value of first deviation is less than or equal to second deviation
Absolute value determines that the first cooperation curved surface is selected reference face, when the absolute value of first deviation is greater than second deviation
The absolute value of value determines that the second cooperation curved surface is selected reference face.
Optionally, described to survey selected step including the use of face difference cubing, in multiple positions on the basis of the first cooperation curved surface
The the first face difference for setting the first cooperation curved surface of measurement and the second cooperation curved surface is surveyed on the basis of the second cooperation curved surface in multiple positions
Flow control one cooperates the second face difference of curved surface and the second cooperation curved surface, calculates the first mean value and the face of multiple first face differences
First deviation average of poor preset value, calculate multiple second face differences the second mean value and face difference preset value second partially
Poor average value, when first deviation average absolute value be less than or equal to second deviation average absolute value, really
Fixed first cooperation curved surface is selected reference face, when the absolute value of first deviation average is greater than second deviation average
Absolute value, determine the second cooperation curved surface be selected reference face.
The datum level of the disclosure determines that method determines by way of it will simulate and determine and survey selected combine come final
Datum level can eliminate issuable error in one of situation, so as to accurately determine datum level, after being conducive to
The measurement of continuous face difference, and then convenient for subsequent assembly, detection etc..
Other feature and advantage of the disclosure will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
Attached drawing is and to constitute part of specification for providing further understanding of the disclosure, with following tool
Body embodiment is used to explain the disclosure together, but does not constitute the limitation to the disclosure.In the accompanying drawings:
Fig. 1 is the flow chart that method is determined according to the datum level of the cooperation curved surface of disclosure illustrative embodiments；
Fig. 2 is that the section simulated in method and determine that step is related to is determined according to the datum level of disclosure illustrative embodiments
The schematic diagram of position；
Fig. 3 is to be determined to simulate in method according to the datum level of disclosure illustrative embodiments to determine that step is related to measurement the
The schematic diagram of one face aberration measurements and the second face aberration measurements.
Description of symbols
1 first cooperation curved surface 2 second cooperates 3 section of curved surface
The first point of contact a1 the second point of contact b1 the first basic point a2 the second basic point of b2
C1 first straight line c2 second straight line
Specific embodiment
It is described in detail below in conjunction with specific embodiment of the attached drawing to the disclosure.It should be understood that this place is retouched
The specific embodiment stated is only used for describing and explaining the disclosure, is not limited to the disclosure.
As previously mentioned, in vehicle component assembly, it is thus necessary to determine that face difference or gap between complex-curved, to be adjusted
It is whole.Referring to Fig. 1, to accurately measure face difference, this disclosure relates to a kind of datum level for cooperating curved surface determines method, the datum level
The method of determination may include: to simulate to determine step, determine the first cooperation curved surface 1 and the second cooperation curved surface by analogue measurement face difference
Simulation datum level in 2 surveys selected step, determines the first cooperation curved surface 1 and the second cooperation curved surface 2 by Entity measurement face difference
In selected reference face can simulate translation first and cooperate when simulation datum level and selected reference face are different cooperation curved surfaces
Curved surface 1 or the second cooperation curved surface 2 simultaneously re-start the determining step of simulation and survey selected step two step, when simulation datum level
With selected reference face be same cooperation curved surface, determine the same cooperation curved surface be target fiducials face, that is, determine simulate datum level or
Selected reference face is target fiducials face, which is required datum level.
Said reference face determines in method that cooperation curved surface is primarily referred to as two curved surfaces matched in vehicle, for example, as schemed
Shown in 2, the first cooperation curved surface 1 shown is engine hood panel, and the second cooperation curved surface 1 is headlight plate.It is appreciated that the disclosure
In first cooperation curved surface 1 and second cooperation curved surface 2 can be any two matched curved surface on vehicle, be also possible to other
The two cooperation curved surfaces that may relate in device or equipment, therefore it is not limited to two shown in Fig. 2 specific cooperation curved surfaces.Described
Simulation determines in step, such as can pass through and draw the first cooperation curved surface 1 and the second cooperation curved surface 2 and the face of measurement between the two
Difference.Specifically, such as aforementioned drafting and measurement can be realized in three-dimensional software, but be not limited to the simulation steps.It is selected in actual measurement
In step, selected reference face is determined by Entity measurement face difference, " material object " therein had both referred to the first cooperation curved surface 1 and the second cooperation
Curved surface 2 is two and is respectively provided with the physical unit of multiple curved surfaces, while the entity apparatus that while also referring to measuring surface difference uses, such as face
Poor cubing or face difference instrument etc..In addition, datum level determines in method, simulates and determine that step writes on before the selected step of actual measurement, but
It is that in actual operation, two steps have no sequencing." simulation translation " the first cooperation curved surface 1 or the second cooperation curved surface 2 are
Refer to, the direction vector along the curvature portion of the close face difference of the first cooperation curved surface 1 moves the first cooperation curved surface 1, or along second
Cooperate the mobile second cooperation curved surface 2 of the direction vector of the curvature portion of the close face difference of curved surface 2, thus in " simulation translation " first
Simulation, which can be re-started, after cooperation curved surface 1 or the second cooperation curved surface 2 determines step.It is surveyed in selected step re-starting, then
It can be realized by being measured in different location, naturally it is also possible to select step, the disclosure using other available survey
This is not limited.
Method is determined according to said reference face, and the disclosure will be by way of it will simulate and determine and survey selected combine come most
Datum level is determined eventually.Simulation determination and actual measurement, which are selected between can reducing, to be caused because of measurement error or other factors
Datum level determines inappropriate problem, so as to accurately determine datum level, is conducive to the measurement of subsequent face difference, and then be convenient for
Subsequent assembly, detection etc..It will determine that method is elaborated in more detail to datum level below:
In a specific embodiment, the simulation determines that step may include creating in three-dimensional software while intercepting first
Cooperate between the section 3 of curved surface 1 and the second cooperation curved surface 2, the section 3 and the first cooperation curved surface 1 and the cooperation of the second cooperation curved surface 2
Gap is perpendicular, and analogue measurement face difference is obtained in section 3.It according to actual needs, can be bent along the first cooperation
Fit clearance between face 1 and the second cooperation curved surface 2 creates one or more sections 3, and multiple sections 3 are preferably along fit clearance etc.
It is distributed to spacing, as shown in Fig. 2, the spacing between section 3 is substantially in 25mm~100mm.In addition, avoiding the first cooperation curved surface 1
Section 3 is created with the edge of the second cooperation curved surface 2, section 3 can be reduced as far as possible and do not cooperated with the first cooperation curved surface 1 and second
In the vertical situation of curved surface 2, such as illustrative embodiments described in Fig. 2, two sections 3 by proximal edge are respectively away from first
Cooperate distance d substantially 4mm~6mm of curved surface 1 or the second cooperation curved surface.
Such as in the case where creating a section, simulates and determine that step may include: in section 3, with the first cooperation
On the basis of curved surface 1, the first face aberration measurements h of the first cooperation curved surface 1 of measurement and the second cooperation curved surface 21, with the second cooperation curved surface
On the basis of 2, the second face aberration measurements h of the first cooperation curved surface 1 of measurement and the second cooperation curved surface 22, calculate the first face aberration measurements
h1With the first difference DELTA h of face difference preset value h1(h1- h=Δ h1) and the second face aberration measurements h2With the second of face difference preset value h
Difference DELTA h2(h2- h=Δ h2), as the first difference DELTA h1Absolute value be less than or equal to the second difference DELTA h2Absolute value ,, that is, ∣ Δ
h1∣≤∣Δh2∣ can determine the first cooperation curved surface 1 for simulation datum level, conversely, as the first difference DELTA h1Absolute value be greater than
Second difference DELTA h2Absolute value ,, that is, ∣ Δ h1∣ > ∣ Δ h2∣ can then determine the second cooperation curved surface 2 for simulation datum level.Wherein
It should be noted that face difference preset value h refers to rule of thumb resulting face difference or the face difference according to as defined in certain specification.Separately
Outside, it is to be understood that according to above-mentioned multilevel iudge, in the first difference DELTA h1Absolute value be equal to the second difference DELTA h2It is absolute
In the case where value, the first cooperation curved surface 1 and the second cooperation curved surface 2 are it can be assumed that be suitable for being selected as simulation datum level, this is to rear
Continuous assembly, detection etc. have little effect.
In the case where creating multiple sections, for example, the simulation determine step may include: in each section 3, with
The first face aberration measurements h on the basis of first cooperation curved surface 1, between the first cooperation curved surface 1 of measurement and the second cooperation curved surface 21, with
The second face aberration measurements h on the basis of second cooperation curved surface 2, between the first cooperation curved surface 1 of measurement and the second cooperation curved surface 22, meter
Calculate multiple first face aberration measurements h1The first face difference average value h1vWith the first mean difference Δ h of face difference preset value h1v(h1v-h
=Δ h1v), calculate multiple second face aberration measurements h2The second face difference average value h2vWith the second mean difference of face difference preset value h
Δh2v(h2v- h=Δ h2v), as the first mean difference Δ h1vAbsolute value be less than or equal to the second mean difference Δ h2vIt is absolute
Value ,, that is, ∣ Δ h1v∣≤∣Δh2v∣ can determine the first cooperation curved surface 1 for simulation datum level, as the first mean difference Δ h1vIt is exhausted
Second mean difference Δ h is greater than to value2vAbsolute value, determine the second cooperation curved surface 2 for simulation datum level.Tong Yang , ∣ Δ h1v∣=
∣Δh2vIn the case where ∣, the first cooperation curved surface 1 and the second cooperation curved surface 2 are it can be assumed that be suitable for being selected as simulation datum level.In
In the specific embodiment, pass through the multiple first face aberration measurements h that will be measured1With the second face aberration measurements h2It is taken respectively
It is compared again with face difference preset value h after average, can more precisely complete the selection of simulation datum level.
In the above-mentioned embodiment for carrying out simulating determining step, the first face aberration measurements h is measured1Specific method can be with
There are many, as shown in figure 3, the point of contact that this method may include: the angle R of selection the first cooperation curved surface 1 is the first point of contact a1, choose
Pass through the first point of contact a1 and the first basic point at a distance of the first basic point b1 of the first length with the first point of contact a1 on first cooperation curved surface 1
B1 generates the first straight line c1 for extending to the second cooperation curved surface 2, and the point of contact for choosing the angle R of the second cooperation curved surface 2 is the second point of contact
The vertical range of a2, the second point of contact a2 to first straight line c1 are the first face aberration measurements h1。
Measure the second face aberration measurements h2Specific method can be different from the above method, naturally it is also possible to similarly wrap
It includes: choosing the second basic point b2 on the second cooperation curved surface 2 with the second point of contact a2 at a distance of the second length, pass through the second point of contact a2 and the
Two basic point b2 generate the second straight line c2 for extending to the first cooperation curved surface 1, the vertical range of the first point of contact a1 to second straight line c2
For the second face aberration measurements h2。
Although the first face aberration measurements h has been described in detail above1With the second face aberration measurements h2Method or process, still
The disclosure should not be limited to this method.Wherein, the angle R of the first cooperation curved surface 1 and the second cooperation curved surface 2 should be respectively to cut open
Close to the arc chord angle of the fit clearance in face, the first point of contact a1 is the arc sections in the first cooperation curved surface 1 close to fit clearance
Divide the point to connect with other parts, similarly, the second point of contact a2 is the circular arc portion in the second cooperation curved surface 2 close to fit clearance
The point to connect with other parts.As can be seen that measuring the first face aberration measurements h using above-mentioned similar procedure1It is poor with the second face
Measured value h2In the case where, the angle the R point of contact of two cooperation curved surfaces is to determine point, i.e. the first point of contact a1 and the second point of contact position a2 are true
It is fixed, therefore, determine the direction of the first straight line c1 and second straight line c2 of vertical range size then respectively by first length and
Second length determines.Therefore, the first length should be equal to the second length, to ensure the accuracy measured.
Selected step is surveyed for described, in a specific embodiment may include: using face difference cubing, with first
Cooperate measurement first on the basis of curved surface 1 that curved surface 1 and second is cooperated to cooperate the first face difference of curved surface 2, is with the second cooperation curved surface 2
Reference measurement first cooperates the second face difference of curved surface 1 and the second cooperation curved surface 2, calculates the first face difference and face difference preset value
Second deviation of the first deviation and the second face difference and face difference preset value, in this way, the absolute value when the first deviation is less than
Or the absolute value equal to the second deviation, determine that the first cooperation curved surface 1 is selected reference face, when the absolute value of the first deviation is big
In the absolute value of the second deviation, determine that the second cooperation curved surface 2 is selected reference face.It is similar in determining step with simulating, wherein
In the case that the absolute value of first deviation is equal to the absolute value of the second deviation, the first cooperation curved surface 1 and the second cooperation curved surface 2
It can be used as required selected reference face.
Above embodiment is related to single-point actual measurement and selectes, and the step selected for multiple spot actual measurement may include: poor using face
Cubing, in the first face of the first cooperation curved surface 1 of multiple positions measurement and the second cooperation curved surface 2 on the basis of the first cooperation curved surface 1
Difference, in the second face of the first cooperation curved surface 1 of multiple positions measurement and the second cooperation curved surface 2 on the basis of the second cooperation curved surface 2
Difference calculates the first mean value of multiple first faces difference and the first deviation average of face difference preset value, calculates multiple second faces
Second mean value of difference and the second deviation average of face difference preset value, when the absolute value of the first deviation average is less than or equal to
The absolute value of second deviation average determines that the first cooperation curved surface 1 is selected reference face, when the absolute value of the first deviation average
Greater than the absolute value of the second deviation average, determine that the second cooperation curved surface 2 is selected reference face.Wherein, the first deviation average
Absolute value be equal to the second deviation average absolute value in the case where, first cooperation curved surface 1 with second cooperate curved surface 2 can make
For required selected reference face.In addition, multiple positions involved in above-mentioned steps can preferably determine in step with simulating
One or more 3 positions of section are corresponding, so that realizing that simulation is determined and surveyed can be well matched between selected, with more preferable
Ground is mutually matched and is verified, and the accuracy in determining target fiducials face is improved.
The preferred embodiment of the disclosure is described in detail in conjunction with attached drawing above, still, the disclosure is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the disclosure, a variety of letters can be carried out to the technical solution of the disclosure
Monotropic type, these simple variants belong to the protection scope of the disclosure.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, can be combined in any appropriate way, in order to avoid unnecessary repetition, the disclosure to it is various can
No further explanation will be given for the combination of energy.
In addition, any combination can also be carried out between a variety of different embodiments of the disclosure, as long as it is without prejudice to originally
Disclosed thought equally should be considered as disclosure disclosure of that.
Claims (10)
1. a kind of datum level for cooperating curved surface determines method, which is characterized in that the datum level determines that method includes:
It simulates and determines step, the mould in the first cooperation curved surface (1) and the second cooperation curved surface (2) is determined by analogue measurement face difference
Quasi- datum level,
Selected step is surveyed, the choosing in the first cooperation curved surface (1) and the second cooperation curved surface (2) is determined by Entity measurement face difference
Determine datum level,
When the simulation datum level is different cooperation curved surfaces, simulation translation the first cooperation curved surface from the selected reference face
(1) or described second cooperates curved surface (2) and re-starts the determining step of the simulation and the selected step of the actual measurement, when the mould
Quasi- datum level and the selected reference face are same cooperation curved surface, determine the simulation datum level or the selected reference face is mesh
Mark datum level.
2. datum level according to claim 1 determines method, which is characterized in that the simulation determines that step is included in three-dimensional
The section (3) of first cooperation curved surface (1) and second cooperation curved surface (2), the section are created while intercepted in software
(3) perpendicular with the fit clearance of the first cooperation curved surface (1) and the second cooperation curved surface (2), analogue measurement face difference is in institute
It states in section (3) and obtains.
3. datum level according to claim 2 determines method, which is characterized in that the simulation determines that step includes: in institute
It states in section (3), on the basis of the first cooperation curved surface (1), the first cooperation curved surface (1) of measurement and the of the second cooperation curved surface (2)
One face aberration measurements (h1), on the basis of the second cooperation curved surface (2), the first cooperation curved surface (1) of measurement and the second cooperation curved surface (2)
The second face aberration measurements (h2),
Calculate the first face aberration measurements (h1) with the first difference (Δ h of face difference preset value (h)1) and the survey of second face difference
Magnitude (h2) with the second difference (Δ h of face difference preset value (h)2), as the first difference (Δ h1) absolute value be less than or equal to
Second difference (the Δ h2) absolute value, determine the first cooperation curved surface (1) for simulation datum level, when the first difference (Δ
h1) absolute value be greater than the second difference (Δ h2) absolute value, determine the second cooperation curved surface (2) for simulation datum level.
4. datum level according to claim 2 determines method, which is characterized in that the simulation determines that step includes: creation
Multiple sections (3), in each section (3), on the basis of the first cooperation curved surface (1), measurement the first cooperation curved surface
(1) the first face aberration measurements (h between the second cooperation curved surface (2)1), on the basis of the second cooperation curved surface (2), measurement first
Cooperate the second face aberration measurements (h between curved surface (1) and the second cooperation curved surface (2)2),
Calculate multiple first face aberration measurements (h1) the first face difference average value (h1v) with it is the first of face difference preset value (h) flat
Equal difference (Δ h1v), calculate multiple second face aberration measurements (h2) the second face difference average value (h2v) and face difference preset value
(h) the second mean difference (Δ h2v), as the first mean difference (Δ h1v) absolute value be less than or equal to it is described second flat
Equal difference (Δ h2v) absolute value, determine the first cooperation curved surface (1) for simulation datum level, when the first mean difference (Δ
h1v) absolute value be greater than the second mean difference (Δ h2v) absolute value, determine the second cooperation curved surface (2) for simulation benchmark
Face.
5. datum level according to claim 3 or 4 determines method, which is characterized in that measurement first face aberration measurements
(h1) include:
The point of contact for choosing the angle R of first cooperation curved surface (1) is the first point of contact (a1), chooses first cooperation curved surface (1)
The first basic point (b1) with first point of contact (a1) at a distance of the first length is gone up,
The first straight line for extending to second cooperation curved surface (2) is generated by the first point of contact (a1) and the first basic point (b1)
(c1),
The point of contact for choosing the angle R of second cooperation curved surface (2) is the second point of contact (a2), second point of contact (a2) to described the
The vertical range of one straight line (c1) is the first face aberration measurements (h1)。
6. datum level according to claim 5 determines method, which is characterized in that measurement the second face aberration measurements (h2)
Include:
The second basic point (b2) in second cooperation curved surface (2) with second point of contact (a2) at a distance of the second length is chosen,
It is generated by second point of contact (a2) and second basic point (b2) and extends to the second of first cooperation curved surface (1)
Straight line (c2),
The vertical range of first point of contact (a1) to the second straight line (c2) are the second face aberration measurements (h2)。
7. datum level according to claim 6 determines method, which is characterized in that it is long that first length is equal to described second
Degree.
8. datum level according to claim 2 determines method, which is characterized in that avoid it is described first cooperation curved surface (1) and
The edge of second cooperation curved surface (2) creates the section (3).
9. datum level according to any one of claim 1 to 4 determines method, which is characterized in that the selected step of actual measurement
It suddenly include: the first cooperation curved surface (1) of measurement and the second cooperation curved surface on the basis of the first cooperation curved surface (1) using face difference cubing
(2) the first face difference, the first cooperation curved surface (1) of measurement and the second cooperation curved surface (2) on the basis of the second cooperation curved surface (2)
Second face difference,
Calculate the first deviation and second face difference and face difference preset value of first face difference and face difference preset value
Second deviation, when first deviation absolute value be less than or equal to second deviation absolute value, determine first
Cooperate curved surface (1) be selected reference face, when first deviation absolute value be greater than second deviation absolute value, really
Fixed second cooperation curved surface (2) is selected reference face.
10. datum level according to any one of claim 1 to 4 determines method, which is characterized in that the selected step of actual measurement
It suddenly include: using face difference cubing, in the first cooperation curved surface (1) of multiple positions measurement and the on the basis of the first cooperation curved surface (1)
First face difference of two cooperations curved surface (2), in multiple positions measurement the first cooperation curved surface on the basis of the second cooperation curved surface (2)
(1) the second face difference for cooperating curved surface (2) with second,
The first mean value of multiple first face differences and the first deviation average of face difference preset value are calculated, is calculated multiple described
Second mean value of the second face difference and the second deviation average of face difference preset value, when the absolute value of first deviation average
Less than or equal to the absolute value of second deviation average, determine that the first cooperation curved surface (1) is selected reference face, when described the
The absolute value of one deviation average is greater than the absolute value of second deviation average, determines that the second cooperation curved surface (2) is selected
Datum level.
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