CN117725338A - Deviation calculation method for measuring point change caused by assembly reference deviation - Google Patents
Deviation calculation method for measuring point change caused by assembly reference deviation Download PDFInfo
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Abstract
The invention discloses a deviation calculation method based on the change of a measurement point caused by assembly reference deviation, which comprises the steps of firstly establishing a deviation calculation table, and setting input parameters in the table; secondly, inputting various known parameter data into a parameter input column of an excel table, and automatically forming various data in a measuring point deviation value column through an edited calculation formula; filling main content of each analysis in the remark column for comparative analysis and recording each calculation result; and storing the edited calculation formula and calculation template in an Excel file to form a reusable calculation method. The invention only needs to input the corresponding value measured from the data into the tool table, so that the required deviation value can be automatically calculated, the time is saved, the tedious thinking process of the problem is omitted, the problem is rapidly solved, and the improvement scheme is rapidly formulated.
Description
Technical Field
The invention relates to a deviation calculation method of a white automobile body, in particular to a deviation calculation method suitable for measuring point change caused by assembly reference deviation in the process of designing and manufacturing positioning holes and pin precision of white automobile body parts of automobiles, and belongs to the technical field of automobile part design and assembly.
Background
When the size chain of the measuring point is analyzed in the prior size engineering profession in the automobile industry, under the condition that the assembly datum point is not rotated, the deviation of the measuring point is calculated by adopting a root mean square method to analyze the size deviation and the matching problem, which often neglects that when the fit clearance of a positioning datum hole and a pin is larger or the assembly between real parts is carried out, when the position deviation of the positioning datum point of the real parts is larger, the rotation of the parts can be caused, and when the distance between the measuring point and the main datum point is larger than the distance between the main datum point and the auxiliary datum point, the deviation of the measuring point can be increased in multiple steps, and the deviation value is far larger than the deviation value calculated by adopting a common root mean square method. Such as: the assembly fit gap between the light truck front bumper and the car body, the assembly fit gap between the mud guard and the wheel trim, the assembly fit gap between the front surrounding daytime running light and the middle penetrating light of the car, the surface difference and the like.
Meanwhile, the existing calculation method is relatively complicated, firstly, after the relative deviation values of the main datum point and the auxiliary datum point are acquired, drawing is carried out in drawing software to calculate the rotation angle, then the whole data is rotated around the main datum point by the angle, then the change of the original data and the new data is compared, the deviation values in the required comparison direction are measured by using a measuring tool, when the angle is changed, the rotation and comparison work is repeated, the operation is complicated, and the user still feels the situation of no follow-up when thinking is unclear.
In order to improve the accuracy of dimensional engineering analysis and the problems in the rapid analysis and matching process, it is necessary to design a deviation calculation method and tool which can be used for designing a clearance value for positioning a reference hole and matching a pin and also can be used for rapid analysis and matching.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention is to provide a deviation calculating method for measuring point variation based on assembly reference deviation, so as to solve the problem of deviation of DTS measuring point or control point caused by deviation of positioning reference point during design and assembly of automobile parts, thereby improving rationality and accuracy of size deviation analysis, and providing a method for rapidly analyzing matching problem.
In order to solve the above technical problems, the present invention provides a deviation calculating method for causing a change in a measurement point based on an assembly reference deviation, comprising the steps of:
step 1, establishing a deviation calculation table, and setting input parameters in the table, wherein the input parameters at least comprise a sequence number column, an input parameter column, a measuring point deviation value column and a remark column;
step 2, inputting various known parameter data into a parameter input column of an excel table, and automatically forming various data in a measuring point deviation value column through an edited calculation formula; the parameter input column comprises a line segment AC, a line segment AB, a line segment BE, an angle DBE and an angle MCN, and the measuring point deviation value comprises a line segment CM, a line segment CN and a line segment MN;
step 3, filling main content of each analysis in the remark column for comparative analysis and recording each calculation result;
and 4, storing the edited calculation formula and calculation template in an Excel file to form a reusable calculation method.
Further, in the step 1, the sequence number column is used for inputting the sequence number of the problem analysis, the parameter input column is used for inputting the basic data required by the problem analysis, the measurement point deviation value column is used for displaying the result of each problem analysis, and the remark column is used for explaining the analysis.
Further, in the step 1, according to an assembly positioning strategy or a design drawing, a distance between a main datum point and an auxiliary datum point of the vehicle body part is measured and obtained from 3D data and is used as an input value of the length of the line segment AB;
and according to the actual measurement report of the vehicle body of the vehicle type, the actual deviation value of the main datum point and the auxiliary datum point of the assembly and the matching of the vehicle body parts in the Y direction is found out and used as the input value of the line segment BE.
In step 2, the line segment AB is a connection line between the main reference point a and the auxiliary reference point B, and is obtained according to an assembly positioning strategy, 3D data or a corresponding design drawing;
the line segment AC is the distance between the measuring point C on the part and the main datum point A, and is obtained by measuring from 3D data according to a positioning strategy;
the line segment BE is the relative deviation value of the auxiliary reference relative to the main reference in a certain direction, and is obtained from the fit clearance of design data and the measurement deviation of a real object; point E is a sub reference point B, and is a relative deviation point in a certain direction with respect to the main reference point a
The angle DBE is the included angle between the connecting line AB between the main datum point and the auxiliary datum point and the adjacent coordinate axis, the included angle can be obtained by measurement from 3D data, and the point D is the deviation point of the auxiliary datum point B in the normal direction of the connecting line AB between the main datum point and the auxiliary datum point;
the angle MCN is the included angle between the measuring point, the connecting line between the main datum points and the adjacent coordinate axes of the main datum and the auxiliary datum, is a parameter for marking the position of the measuring point C in the coordinate system, and can be obtained by measuring from 3D data;
the line segment BD is the deviation value of the auxiliary datum point relative to the normal direction of the main datum line and the auxiliary datum line, and is obtained through calculation according to the following formula:
the line segment CM is the deviation value of the connecting line between the measuring point C and the main datum point A in the normal direction; point M is the deviation point of measurement point C in the AC-link normal direction, i.e. CM is perpendicular to AC; because the point C is a measuring point on the part, when the relative values of the main datum point and the auxiliary datum point deviate, the part can rotate around the main datum point in the forward direction and the reverse direction, and the rotating angle of the measuring point C is consistent with the rotating angle of the point B, the right triangle ABD and the right triangle ACM are similar triangles, and the line segment CM is obtained by calculating the following formula:
the line segment CN is the deviation value of the measuring point C in the coordinate axis direction, the point N is the deviation value of the measuring point C in the coordinate axis direction, namely the line segment CN is the projection of the line segment CM in the coordinate axis direction; obtained by calculation of the following formula:
the line segment MN is the deviation value of the measuring point in the coordinate axis direction, and is obtained through calculation according to the following formula:
further, with increasing MCN, in principle, the direction of CN and MN changes automatically once every 180 °, usually once after 90 ° and once again every 180 °. That is, the direction of the coordinate axis expressed by the deviation value of the line segment MN will change, and the direction (i.e., ±) is the "-" sign automatically generated by the formula after the angle value is input.
Compared with the prior art, the invention has the beneficial effects that: the invention only needs to input the corresponding value measured from the data into the tool table, so that the required deviation value can be automatically calculated, the time is saved, the tedious thinking process of the problem is omitted, the problem is rapidly solved, and the improvement scheme is rapidly formulated.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram showing the relationship between each measuring point and the main and auxiliary reference points in the present invention.
Detailed Description
The present embodiment provides a deviation calculating method for causing a change in a measurement point based on an assembly reference deviation, including the steps of:
step 1, establishing a deviation calculation table, and setting input parameters in the table, wherein the input parameters at least comprise a sequence number column, an input parameter column, a measuring point deviation value column and a remark column;
step 2, inputting various known parameter data into a parameter input column of an excel table, and automatically forming various data in a measuring point deviation value column through an edited calculation formula; the parameter input column comprises a line segment AC, a line segment AB, a line segment BE, an angle DBE and an angle MCN, and the measuring point deviation value comprises a line segment CM, a line segment CN and a line segment MN;
step 3, filling main content of each analysis in the remark column for comparative analysis and recording each calculation result;
and 4, storing the edited calculation formula and calculation template in an Excel file to form a reusable calculation method.
Example 1
Because there are X, Y, Z directions for the DTS measurement points or the control points of the parts, problems will occur in one direction during the matching process, and the corresponding data will be projected to the parallel plane where the problems occur for calculation during the calculation of the deviation, and the following steps are shown in fig. 1.
Step 1: according to an assembly positioning strategy or a corresponding design drawing, measuring and obtaining the distance between a main datum point and a secondary datum point of the daytime running light from 3D data, wherein the distance is used as an input value of the length of a line segment AB, namely AB=579mm; then the included angle DFB between the line segment AB and the adjacent coordinate axis (X axis) is measured, according to the relation diagram of figure 1, the angle DFB= angle DBE can be obtained, i.e. the measured angle value can be used as the input value of the angle DBE, and then the line segment AB is arranged below the adjacent coordinate axis, the number of the line segment AB is determined to be increased in front of the line segment AB, i.e. the number of the line segment AB is determined to be increased
∠DBE＝-52.58°；
Step 2: and (3) finding out the actual deviation value of the main datum point and the auxiliary datum point of the daytime running light assembly and matching in the Y direction from the actual measurement report of the white car body of the car type, and calculating the relative deviation value to BE 1.0mm as the input value of a line segment BE, namely BE=1.0 mm. The design clearance between the main reference hole pin and the auxiliary reference hole pin which are assembled and matched with the daytime running light of the vehicle type is 0.1, and can be ignored.
Step 3: the point D is a deviation point of the auxiliary reference point B in the normal direction of the main and auxiliary reference point line AB, and when the angle dbe= -52.58 ° has been obtained by the first step and the second step, the deviation value be=1.0 of the auxiliary reference point B in the Y direction with respect to the main reference point a can BE calculated as the deviation value BD of the auxiliary reference point B in the normal direction of the main and auxiliary reference point line B by the following formula:
step 4: the point C is a measuring point with a Y-direction DTS matching relation between a daytime running light and a middle penetrating light, the space distance between the ACs is measured from the 3D data, and then the space distance is projected to the length of the space distance between the ACs in an XY plane where the main reference and the auxiliary reference are located, and the space distance is used as the length of a line segment AC, namely AC= 704.8mm; meanwhile, the included angle between the projection line and the X axis is measured, and the relation diagram of fig. 1 shows that the measured angle value of the angle MHC= MCN can be used as the input value of the angle MCN, and the fact that the "-" number, namely the angle mcn= -28.58 DEG, needs to be added in front of the data line segment AC is determined according to the fact that the data line segment AC is arranged below the adjacent coordinate axes.
Step 5: because the point C is the point on the daytime running light, when the main datum point and the auxiliary datum point are assembled and move or rotate, the point C also rotates along with the rotation of the main datum point and the auxiliary datum point, so that the angle values of the angle BAD and the angle CAM are consistent, namely the angle BAD= angle CAM, the point M is the point of the point C which is upward in the AC method of connecting the point C with the main datum point A, the right triangle CAM and the right triangle BAD are similar triangles, and the change CM of the point C can be calculated according to the following formula:
step 6: in the case where the variation CM of the point C in the AC-wiring direction has been found, the data obtained above are again: ab=579, ac=704.8, be=1.0, ++dbe= -52.58 °,
the angle mcn= -28.58 ° is converted into its deviation in the coordinate axis direction by the following formula.
Step 7: according to the result of the sixth step, the relative deviation of the main datum point and the auxiliary datum point of the DTS measuring point C on the daytime running light in the Y direction is 1.0mm, so that the deviation of the gap in the Y direction reaches 1.76mm, the surface difference in the X direction reaches 0.96mm, and the deviation exceeds the DTS definition value, and the method can be used for improvement.
Step 8: for systemization and standardization, the problem can BE rapidly analyzed and solved, parameters AC, AB, BE, & lt DBE and & lt MCN obtained in the above work can BE directly input into the parameter input column of the table diagram 1 which is compiled by Excel, and various data in the measuring point deviation value column of the diagram 1 can BE automatically obtained.
TABLE 1 deviation calculation report for measuring point variation caused by assembly reference deviation
Example 2
Step 1: obtaining a main and auxiliary datum point distance AB=740 of a rear mounting point of the auxiliary frame of the engine from the 3D data, wherein the line AB is parallel to the Y axis of the adjacent coordinate axis, and then +.DBE=0;
step 2: finding out the X-direction relative deviation BE=1.6 between main and auxiliary datum points of an auxiliary frame of the engine from a white vehicle body measurement report, wherein the hole pin design clearance is ignored;
step 3: the distance ac= 1100.7 between the measurement point C (the right rear mounting point of the auxiliary frame) and the main reference point a is measured from the 3D data, and the position parameter +.mcn= 97.203 ° of the measurement point C in the vehicle body coordinate system, that is, the angle +.mcn between the line AC and the Y axis in XY is obtained.
Step 4: substituting the data obtained above into the following formula, the amounts of deviation of the measurement point C (the right rear mounting point of the subframe) in the X-axis and Y-axis directions can be obtained.
Step 5: the parameters AC, AB, BE, tiDBE and TimcN obtained in the above work can BE directly input into the parameter input column of the table 1, and various data in the measuring point deviation value column of the table 1 can BE automatically obtained. According to the calculation result, the right rear mounting point of the auxiliary frame of the engine is obtained, when the relative deviation of the X direction of the main datum point and the auxiliary datum point of the auxiliary frame assembled on the white vehicle body is 1.6mm, the deviation of the right rear mounting point of the auxiliary frame in the Y direction is MN=2.36, the deviation of the right rear mounting point in the X direction is CN= -0.3,2.36, and the deviation exceeds the designed limit deviation by 2.0, so that the right rear mounting point cannot be assembled.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (5)
1. A deviation calculation method for measuring point change based on assembly reference deviation is characterized in that: the method comprises the following steps:
step 1, establishing a deviation calculation table, and setting input parameters in the table, wherein the input parameters at least comprise a sequence number column, an input parameter column, a measuring point deviation value column and a remark column;
step 2, inputting various known parameter data into a parameter input column of an excel table, and automatically forming various data in a measuring point deviation value column through an edited calculation formula; the parameter input column comprises a line segment AC, a line segment AB, a line segment BE, an angle DBE and an angle MCN, and the measuring point deviation value comprises a line segment CM, a line segment CN and a line segment MN;
step 3, filling main content of each analysis in the remark column for comparative analysis and recording each calculation result;
and 4, storing the edited calculation formula and calculation template in an Excel file to form a reusable calculation method.
2. The deviation calculating method based on the variation of the measurement point caused by the assembly reference deviation according to claim 1, characterized in that: in the step 1, the sequence number column is used for inputting the sequence number of the problem analysis, the parameter input column is used for inputting the basic data required by the problem analysis, the measuring point deviation value column is used for displaying the result of each problem analysis, and the remarking column is used for explaining the analysis.
3. The deviation calculating method based on the variation of the measurement point caused by the assembly reference deviation according to claim 1, characterized in that: in the step 1, according to an assembly positioning strategy or a design drawing, measuring and obtaining the distance between a main datum point and an auxiliary datum point of a vehicle body part from 3D data to be used as an input value of the length of a line segment AB;
and according to the actual measurement report of the vehicle body of the vehicle type, the actual deviation value of the main datum point and the auxiliary datum point of the assembly and the matching of the vehicle body parts in the Y direction is found out and used as the input value of the line segment BE.
4. The deviation calculating method based on the variation of the measurement point caused by the assembly reference deviation according to claim 1, characterized in that: in the step 2, the line segment AB is a connection line between the main datum point a and the auxiliary datum point B, and is obtained according to an assembly positioning strategy, 3D data or a corresponding design drawing;
the line segment AC is the distance between the measuring point C on the part and the main datum point A, and is obtained by measuring from 3D data according to a positioning strategy;
the line segment BE is the relative deviation value of the auxiliary reference relative to the main reference in a certain direction, and is obtained from the fit clearance of design data and the measurement deviation of a real object; point E is a sub reference point B, and is a relative deviation point in a certain direction with respect to the main reference point a
The angle DBE is the included angle between the connecting line AB between the main datum point and the auxiliary datum point and the adjacent coordinate axis, the included angle can be obtained by measurement from 3D data, and the point D is the deviation point of the auxiliary datum point B in the normal direction of the connecting line AB between the main datum point and the auxiliary datum point;
the angle MCN is the included angle between the measuring point, the connecting line between the main datum points and the adjacent coordinate axes of the main datum and the auxiliary datum, is a parameter for marking the position of the measuring point C in the coordinate system, and can be obtained by measuring from 3D data;
the line segment BD is the deviation value of the auxiliary datum point relative to the normal direction of the main datum line and the auxiliary datum line, and is obtained through calculation according to the following formula:
the line segment CM is the deviation value of the connecting line between the measuring point C and the main datum point A in the normal direction; point M is the deviation point of measurement point C in the AC-link normal direction, i.e. CM is perpendicular to AC; because the point C is a measuring point on the part, when the relative values of the main datum point and the auxiliary datum point deviate, the part can rotate around the main datum point in the forward direction and the reverse direction, and the rotating angle of the measuring point C is consistent with the rotating angle of the point B, the right triangle ABD and the right triangle ACM are similar triangles, and the line segment CM is obtained by calculating the following formula:
the line segment CN is the deviation value of the measuring point C in the coordinate axis direction, the point N is the deviation value of the measuring point C in the coordinate axis direction, namely the line segment CN is the projection of the line segment CM in the coordinate axis direction; obtained by calculation of the following formula:
the line segment MN is the deviation value of the measuring point in the coordinate axis direction, and is obtained through calculation according to the following formula:
5. the deviation calculating method based on the change in the measurement point caused by the assembly reference deviation according to claim 4, characterized in that: along with the gradual increase of the < MCN, the value directions of CN and MN can be automatically changed once when the < MCN is increased by 180 degrees, namely the coordinate axis direction expressed by the deviation value can be changed.
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