CN111536870A

CN111536870A - Online matching method for vehicle body

Info

Publication number: CN111536870A
Application number: CN202010374819.XA
Authority: CN
Inventors: 苏志勇; 莫文平; 孙政; 陈玉光; 李小强
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2020-05-06
Filing date: 2020-05-06
Publication date: 2020-08-14

Abstract

The invention belongs to the technical field of automobile body geometric quality breeding, and relates to an automobile body online matching method; the method comprises the following steps: 1. fixing the matching tool and the part and fixing the measuring equipment; 2. calibrating the precision of the measuring equipment and establishing a coordinate system; 3. measuring the position degrees of the relevant pins and surfaces of the tool; 4. measuring the position degree, coaxiality, parallelism difference or distance of the relevant holes and surfaces of the parts; 5. analyzing the cause of the problem and deriving a measurement report; 6. adjusting a tool and manually repairing parts; 7. repeating the processes from step 1 to step 6; 8. obtaining a true cause of the problem; in the prior art, the data of tools and parts provided by a supplier is often acquiescent to be accurate, the matching between the parts needs to use red lead powder and plasticine to confirm the related clearance value, the working efficiency is low, and the problem identification is inaccurate; the invention uses the measuring equipment to measure the tool and the part on line, confirms the data deviation through measurement, directly displays whether the problem exists or not, has accurate problem identification and high working efficiency, and is easy to confirm the adjustment and the manual repair amount.

Description

Online matching method for vehicle body

Technical Field

The invention belongs to the technical field of automobile body geometric quality breeding, and relates to an automobile body online matching method.

Background

The size of the current new vehicle type production preparation stage is developed into a working mode, a data vehicle is used as a carrier, a single piece and assembly checking tool and three coordinates are used as main detection means, and the quality target of a white vehicle body is achieved through multiple rounds of part rectification, tool and process optimization. From problem discovery to problem solving, the analysis efficiency is low, the verification period is long, and the production preparation period is not favorably shortened.

In the prior art, the data of tools and parts provided by a default supplier is accurate, the matching between the parts needs to use red lead powder and plasticine to confirm the related clearance value, the working efficiency is low, and the problem identification is inaccurate.

The defects and shortcomings of the traditional vehicle body matching technology mainly comprise three aspects: firstly, the problem phenomenon is confirmed on a production line or a checking fixture, the reason needs to be analyzed by combining data deviation marked on a data table or a part, and the working efficiency is low; secondly, the clamp adjustment is carried out on the production line, the precision after the adjustment cannot be fed back in time, and the precision can be estimated only through the thickness of the gasket; thirdly, the manual repair of parts is verified on the production line or the checking fixture, and the manual repair effect cannot be rapidly confirmed.

Disclosure of Invention

Aiming at the defects existing in the prior art, the invention has three advantages: firstly, the precision of a clamp or a checking fixture of a production line can be directly measured by using measuring equipment such as a joint arm, a laser tracker and the like, meanwhile, parts on the clamp or the checking fixture can also be measured by combining problem phenomena, data are displayed in real time, and the working efficiency is high; secondly, measuring equipment such as a joint arm and a laser tracker can be used for measuring the precision change before and after the clamp is adjusted, whether the actual position of a positioning pin/surface on the clamp is consistent with the required position or not is quickly confirmed, and the working precision is improved, particularly for the positioning pin/surface which is adjusted in a non-spatial direction; thirdly, the precision change before and after the clamp is adjusted can be measured by using measuring equipment such as a joint arm, a laser tracker and the like, the change before and after the part is manually repaired can be quickly confirmed, the manual repair amount can be accurately identified, and the actual effect can be obviously fed back to a part supplier as reference information to be correspondingly modified.

The invention mainly solves the problem of the defects of the traditional vehicle body matching technology in the white vehicle body size development stage, and provides a vehicle body on-line matching method. In order to solve the technical problems, the invention is realized by adopting the following technical scheme, which is described by combining the accompanying drawings as follows:

an online matching method for a vehicle body is characterized by comprising the following steps:

the method comprises the following steps: fixing the matching tool and the part and fixing the measuring equipment;

step two: calibrating the precision of the measuring equipment and establishing a coordinate system;

step three: measuring the position degrees of a positioning surface, a limiting block, a guide block, a positioning pin, a positioning groove or a guide pin of the tool;

step four: measuring the position degree and the parallelism of the molded surface of the part, measuring the position degree of a fabrication hole and an installation hole of the part, measuring the position degree and the coaxiality of a stud of the part, measuring the position degree parallel difference of the local molded surface of the part, measuring the position degree parallel difference of the local profile of the part or measuring the distance between the holes of the part;

step five: analyzing the cause of the problem and deriving a measurement report;

the online matching method for the vehicle body further comprises the following six steps: adjusting a tool and manually repairing parts;

if the tool needs to be adjusted temporarily, the variation before and after adjustment is confirmed through measuring equipment;

if the temporary hand repair part is required to be responded, confirming the deviation value before and after the hand repair through the measuring equipment;

and the modified tool or part confirms whether the modification effect reaches the target value or not through the same working mode.

Step seven: repeating the processes from the third step to the sixth step;

repeating the third step to the sixth step to accurately identify and record the problems of the tools and the parts during the on-line matching of each tool and part;

step eight: obtaining a problem true cause, and quickly feeding back tool and part problems;

the cause of the problem is the root cause of the problem, which is one or several items.

The matching tool in the technical scheme comprises a clamp and a checking fixture, wherein the part refers to one or a plurality of parts to be matched, and the part needs to be positioned and fixed according to the reference position of the clamp or the checking fixture and then fixed with a measuring device;

the measuring equipment comprises a joint arm and a laser tracker, the joint arm is divided into a joint arm main body, a sucker, a power line and a network cable, the sucker is adsorbed on the tool substrate, the joint arm main body is in threaded connection with the sucker, the power line is connected to a voltage stabilizing battery, and the network cable is connected with a computer;

in the technical scheme, the tool substrate has insufficient space for placing the sucker or the tool is vertical, and a measuring device needs to be fixed by a platform plate or a measuring bracket;

the platform plate is connected with the tooling substrate, and the sucker is adsorbed on the platform plate;

the measuring support is fixed on the flat ground near the tool, the telescopic rod is locked after the position of the measuring support is adjusted, the base is fixed by hot melt adhesive, the joint arm is placed at the top end of the measuring support, and the joint arm is fastened through threaded connection.

In the technical scheme, the arm length of the joint arm is 3.5 meters or 4 meters;

the laser tracker comprises a tracker main body, a power line and a temperature sensor;

the power cord links to each other with steady voltage battery, temperature sensor one side links to each other with the laser tracker main part, and the temperature sensor opposite side exposes in the air.

In the technical scheme, the laser tracker is in threaded connection with the measuring support.

In the second step, the accuracy of the measuring equipment is calibrated and a coordinate system is established, and the method specifically comprises the following steps:

after the measurement equipment is fixed, if the side head needs to be replaced or the measurement position is different from the last measurement position, the precision of the measurement equipment needs to be calibrated firstly, and the precision deviation of the measurement equipment is eliminated;

the precision calibration method of the articulated arm comprises the following steps: the calibration block is placed on a plane on the tool, the hot melt adhesive is fixed, the measuring head of the joint arm is placed in the groove of the calibration block, the joint arm is operated to change angles along three gaps of the calibration block, the whole calibration process ensures that the measuring head is always in the groove, and the calibration can be finished if the deviation of the display equipment is qualified after the calibration is finished;

the laser tracker calibration process comprises the following steps: fixing the calibration block on the tool, guiding laser to the position near the calibration block by the target ball, adsorbing the target ball on the calibration block, and automatically completing calibration after the laser tracker receives a calibration command;

after the calibration of the measuring equipment is completed, establishing a coordinate system to start measurement, adopting A3-2-1 system establishing principle, namely, punching 3 points on a tool substrate to determine a plane, and then measuring two measuring reference holes, namely 2 points to determine a straight line, wherein 1 hole controls 1 direction, the other hole controls 2 directions, the hole controlling 2 directions is a circle A20, and the central point of the circle A20 is the origin;

the software used for measurement is polyforks, and the specific system establishing process is as follows: newly building a working area and a project, importing a CAD three-dimensional model, converting the CAD three-dimensional digital model into an IGS format for reuse, newly building 1 plane and 2 circle commands on the CAD three-dimensional digital model respectively, detecting a measured value, selecting two circles, adding a line from an object, finally selecting a plane-axis-central point system, selecting a plane, a straight line and a circle A20 respectively, and completing the system construction.

Measuring the position degree of a positioning surface, a limiting block, a guide block, a positioning pin, a positioning groove or a guide pin of the tool in the third step;

the method comprises the steps of establishing a coordinate system by selecting a plane, an axis and a central point in measurement software Polyworks, then guiding a right key into a CAD model, namely a tool digital-analog, selecting 'debugging-detecting' to directly measure the precision of a positioning surface, a limiting block and a guiding block, selecting a 'cylinder' or a 'circle', detecting the precision of a positioning pin, a positioning groove and a guiding pin, punching 1-4 points on the same positioning surface, punching 6-9 points on the positioning pin, and finally calculating and displaying the size deviation of the measurement characteristics by the measurement software Polyworks.

Step four, measuring the position degree and the parallelism of the molded surface of the part, the position degree of the process hole and the mounting hole of the part, the position degree and the coaxiality of the stud of the part, the position degree parallel difference of the local molded surface of the part, the position degree parallel difference of the local contour of the part or the distance between the holes of the part;

the method specifically comprises the following steps:

after the precision of a positioning surface, a limiting block, a guide block, a positioning pin, a positioning groove or a guide pin of the tool is confirmed to be in accordance with tolerance, a corresponding part is installed, the positioning position is based on reference information on general geometric dimension tolerance, the fitting condition of the positioning surface is verified after the part is positioned, a pressure head is used for clamping after the part is confirmed to be correct, the part is measured by a measuring software, wherein the measuring software displays measuring results, including theoretical values, measured values and deviation values, compares the deviation values with reports provided by a manufacturer and confirms whether the measured results are in accordance with the distance between holes of the part or not, and the measuring software starts to measure the part and comprises a supply-grade single part, a supply-grade assembly, the position degree and the parallelism of a self-made assembly profile, the position degree and the coaxiality of a process hole and an installation hole of the part, the position degree and the parallelism of a stud of the part, and the position degree; the control direction deviation to be displayed is selected in the measurement software, polyforks, by "geometric control".

Analyzing the cause of the problem and deriving a measurement report in the fifth step, wherein the method specifically comprises the following steps:

according to the measurement result, combining the actual matching state of the real object, performing data analysis in time, and judging whether the tool problem or the part problem exists, wherein the specific problem point position, whether a tool precision report and a part measurement report provided by a supplier are consistent with the actual measurement value, if so, the tool precision report and the part measurement report can be fed back to the supplier for rectification, and if not, other reasons need to be continuously verified, such as whether the positioning reference is consistent, and whether the system has a problem or not;

all tool precision deviations and part dimension measurement data in measurement software multiplex measurement are displayed through digital-analog belt data screenshot, and a measurement report is automatically generated for standby.

Compared with the prior art, the invention has the beneficial effects that:

The invention uses the measuring equipment to measure the tool and the part on line, can directly display whether problems exist or not by measuring and confirming the data deviation aiming at the characteristics of the matching surface, the hole, the edge and the like which need to be subjected to size analysis, has accurate problem identification and high working efficiency, and is easy to confirm the adjustment and the manual repair amount.

Drawings

The invention is further described with reference to the accompanying drawings in which:

FIG. 1 is a schematic view of an articulated arm;

FIG. 2 is a schematic view of the manner in which the articulated arm is fixed;

FIG. 3 is a schematic view of the measurement range of the articulated arm;

FIG. 4 is a schematic diagram of a laser tracker structure and measurement range;

FIG. 5 is a schematic diagram of the principle of 3-2-1 system construction;

FIG. 6 is a schematic view of a front door clamp measurement item of a certain vehicle type;

FIG. 7 is a schematic diagram of a measurement item after positioning of a front door inner plate clamp of a certain vehicle type;

FIG. 8 is a schematic diagram of an online measurement result of a front end frame of a certain vehicle type on a finished vehicle inspection device;

FIG. 9 is a flowchart of the vehicle body on-line matching method;

1. an articulated arm body; 2. a suction cup; 3. a power line; 4. a network cable; 5. connecting by screw thread; 6. a voltage stabilization battery; 7. a computer; 8. a tooling substrate; 9. a platform plate; 10. a measuring support; 11. ground 12, laser tracker; 13. a temperature sensor interface; 14. a network port; 15. a power line interface; 16. a plane point A; 17. a plane point B; 18. a plane point C; 19. a plane point D; 20. a circle A; 21. a circle B; 22. a straight line; 23. a clamp substrate; 24. measuring a reference hole; 25. a clamp positioning pin; 26. a clamp positioning surface; 27. positioning holes of an inner plate of the front door; 28. a front door inner plate molded surface; 29. trimming the inner plate of the front door; 30. a front door inner plate hinge mounting hole; 31. a front end frame assembly; 32. a Y-direction fixing hole of the front combined lamp; 33. the whole main detection tool substrate; l represents an articulated arm measurement range; m denotes the laser tracker measurement range.

Detailed Description

The invention is described in detail below with reference to the attached drawing figures:

the invention is mainly divided into eight operation steps:

1. fixed matching tool and part and fixed measuring equipment

The matching tool mainly comprises a clamp and a checking fixture, wherein the parts refer to 1 or more parts needing to be matched, the parts need to be positioned and fixed according to the reference positions of the clamp or the checking fixture, and then the measuring equipment is fixed.

Referring to fig. 1, the commonly used measuring equipment mainly comprises two types, namely a joint arm and a laser tracker, wherein the joint arm comprises a joint arm main body 1, a sucker 2, a power line 3 and a network cable 4, the sucker is adsorbed on a tool substrate, the joint arm main body 1 is in threaded connection with the sucker 2, the power line 3 is connected to a voltage stabilizing battery 6, and the network cable 4 is connected with a computer 7, so that the joint arm is fixed.

Referring to fig. 2, if the tool substrate 8 has insufficient space for placing the suction cup 2 or the tool is vertical, the measuring device needs to be fixed 10 by the platform plate 9 or the measuring support. Platform board 9 links to each other with frock base plate 8, and sucking disc 2 adsorbs on the platform board 9. The measuring support 10 is fixed on a flat ground 11 near the tool, the telescopic rod is locked after the position of the support is adjusted, the base is fixed by hot melt adhesive, the joint arm is placed on the top end of the measuring support 10, and the joint arm is fastened through threaded connection.

Referring to fig. 3, the measurement range of the articulated arm is small, the common arm length is 3.5 meters and 4 meters, and the articulated arm is mainly used for measuring small and medium-sized tools and parts, such as a door assembly clamp, a front cover and a rear cover.

Referring to fig. 4, the laser tracker 12 includes tracker main part, sucking disc, power cord, temperature sensor and net twine, generally does not use the sucking disc because measure the sight badly during fixed laser tracker, and uses and measures the support, measures the support and can select wantonly to level ground fixed, and the laser surveying appearance main part links to each other with measuring the support screw thread, screws up can. The power cord links to each other with the steady voltage battery, and temperature sensor one side links to each other with the laser tracker main part, and temperature sensor one side exposes in the air to temperature compensation. The network cable is not used generally, but the wireless connection is often used, so that the computer can be close to the measuring area, and screen information can be confirmed in time during measurement. The laser tracker has a large measurement range and is mainly used for measuring large-scale tools and parts, such as a main welding line, a side wall outer plate and the like.

2. Calibrating the accuracy of the measuring device and establishing a coordinate system

After the measurement equipment is fixed, if the side head needs to be replaced or the measurement position is different from the last measurement position, the precision of the measurement equipment needs to be calibrated firstly, the precision deviation of the measurement equipment is eliminated, and the precision calibration method of the articulated arm comprises the following steps: place the plane department on the frock with the calibration block, the hot melt adhesive is fixed, puts the gauge head of articulated arm in the recess of calibration block, along the three opening of calibration block, operates articulated arm transform angle, and whole calibration process guarantees that the gauge head is all the time in the recess, if the display device deviation is qualified after the calibration is accomplished, can end. The laser tracker calibration process is relatively simple, the calibration block is fixed on the tool, the target ball guides laser to the position near the calibration block, the target ball is adsorbed on the calibration block, and the laser tracker automatically completes calibration after receiving a calibration command.

Referring to fig. 5, after calibration of the measurement device is completed, a coordinate system needs to be established to start measurement, A3-2-1 system establishment principle is generally adopted, that is, 3 points are punched on a tool substrate to determine a plane, 4 points are punched in practical operation, two measurement reference holes are measured, that is, 2 points determine a straight line, wherein 1 hole controls 1 direction, a hole controlling 1 direction is a circle B21, another hole controls 2 directions, a hole controlling 2 directions is a circle a20, and a central point of the circle a20 is an origin. The software used in cooperation with measurement at present is works, and the specific system establishing process is as follows: the method comprises the steps of newly building a work area, namely a project, importing a CAD three-dimensional model, namely a tool digital analog, converting the digital analog into an IGS format before use, then using the IGS format, newly building 1 plane and 2 circle commands on the digital analog respectively, detecting measured values, selecting two circles, adding a line from an object, finally selecting a plane-axis-central point building system, selecting a plane, a straight line and a circle A respectively, and completing building the system.

3. Measuring the position degree of the positioning surface, the limiting block, the guide block, the positioning pin, the positioning groove or the guide pin of the tool

Referring to fig. 6, after the coordinate system is built, the digital analogy of the right key tooling in the measurement software is selected to directly measure the precision of the positioning surface, then the cylinder is selected to detect the precision of the positioning pin, 1 to 4 points can be printed on the same positioning surface, 6 to 8 points can be printed on the positioning pin, and finally, the measurement software can calculate and display the size deviation of the positioning pin and the positioning surface.

4. Measuring the position and parallelism of the profile of the part, measuring the position and coaxiality of the fabrication hole and the mounting hole of the part, measuring the position and coaxiality of the stud of the part, measuring the position and parallelism difference of the local profile of the part, or measuring the distance between the holes of the part

Referring to fig. 7, after the precision of the tooling positioning pin and the positioning surface is confirmed to be in accordance with the tolerance, a corresponding part needs to be installed, the positioning position is based on the datum information on GD & T, the fitting condition of the positioning surface needs to be verified after the part is positioned, a pressure head is used for clamping after the part is confirmed to be correct, the corresponding profile and trimming dimension deviation of the part and the position degree of a process hole and an installation hole are measured, the measurement software displays the measurement result which comprises a theoretical value, an actual measurement value and an offset value, and then the offset value is compared with a report provided by a manufacturer to confirm whether the measurement result is consistent. The control direction deviation to be displayed can be selected in the measuring software through geometric control, for example, the Z-direction profile can only select Z-direction data to be displayed.

5. Analyzing cause of problem and deriving measurement report

Referring to fig. 8, according to the measurement result, in combination with the actual matching state of the real object, data analysis can be performed in time to determine whether the tool problem or the part problem is the specific problem point position, whether the tool precision report and the part measurement report provided by the supplier are consistent with the actual measurement value, if so, the data can be fed back to the supplier for correction, and if not, other reasons need to be continuously verified, such as whether the positioning reference is consistent, whether the system has a problem or not, and the like.

All measurement data in the measurement software can be displayed by screenshot of digital tape data, and a measurement report is automatically generated for standby.

TABLE 1

As shown in table 1, the measurement result of the positioning hole 32 in the Y direction of the front combination lamp in fig. 8 is obtained, wherein the X direction is deviated from the front direction by 0.8mm, so that the gap between the front combination lamp and the front bumper is reduced, the local interference exists, the data deviation is consistent with the actual matching state, and the data deviation is fed back to the manufacturer for corresponding correction.

6. Adjusting tool and manually repairing part

If the tool needs to be adjusted temporarily, the variation before and after adjustment can be confirmed through the measuring equipment; if the part needs to be temporarily repaired by hand, the deviation value before and after the part is repaired by hand can be confirmed through the measuring equipment, and whether the modified tool or the modified part has the modified effect reaching the target value or not can be confirmed through the same working mode.

7. Repeating the process from 3 to 6

The 3 rd to 6 th steps are repeated for the on-line matching of each tool and part, and the problems of the tool and the part are accurately identified and recorded

8. Get the real cause of the problem, feed back the problems of the tool and the part quickly

The problem is the root cause of the problem, and the cause may be one or more, and most of the cases are multiple causes, but there are major and minor points.

After the problems are confirmed, the corresponding problems need to be fed back to relevant responsibility departments in time, if the problems of the clamp are fed back to a welding technology room, the manufacturers are required to be prompted to quickly modify the clamp, and the problems of the parts are fed back to a stamping technology room, a purchasing part or a quality assurance part, and the manufacturers are required to be prompted to quickly debug the die.

The invention uses the articulated arm and the laser tracker to measure the size of the part on line, the traditional working mode is a measuring tool, the measurement of the size of the part on the tool is a brand new working mode, the data analysis is carried out on line by combining the measurement data calculated by measurement software, and the matching problem analysis work is accurately and efficiently completed.

In the traditional matching technology, a data vehicle is used as a carrier, and the quality target of a white vehicle body is met through multiple rounds of part modification, fixture measurement and debugging, process scheme optimization and the like. From problem discovery to problem solving, the problems of high data analysis difficulty, low working efficiency, long scheme verification period and the like exist.

The sucker position of the measuring equipment is reserved on the existing welding fixture or the base plate of the checking fixture, and the measuring equipment can not be designed actually, so that the measuring equipment is fixed by means of the platform plate or the measuring support, and online matching of parts on the fixture or the checking fixture is realized.

1. On-line matching design principle

The size deviation of the part on the clamp or the checking fixture is measured by means of the measuring equipment, the precision of the clamp and the checking fixture and the size deviation of the part are quantified in real time, data analysis is carried out in time according to accurate data, a matching problem solution is formulated quickly, the validity of the solution can be verified quickly, and the production and calibration period is shortened greatly.

2. On-line matching mode of operation

Fixing a measuring device such as a joint arm or a laser tracker on a clamp or a gauge substrate or an external measuring support, and establishing a coordinate system by using the substrate of the clamp or the gauge and a measuring reference hole according to a 3-2-1 principle or a best fitting principle. Firstly, measuring the precision of a positioning pin and a positioning surface of a clamp or a gauge, then placing a part to be matched on the clamp or the gauge according to a reference position, measuring the profile, trimming and hole position deviation of the part after a pressure head is pressed, combining the actual matching state of the part, namely which position has large clearance, which position interferes and other matching problems, analyzing whether corresponding measurement data is consistent with the actual matching state, recording the problem if the measurement data is consistent with the actual matching state, adjusting the clamp or the hand repairing part according to the situation, and measuring the precision of the adjusted clamp and the size of the hand repaired part again until the matching problem is solved. If not, continuing to analyze and search for other reasons.

Referring to fig. 9, a work flow chart of the vehicle body on-line matching method; an online matching flow chart is compiled by summarizing the whole online matching process of the vehicle body. According to the sequence of work, the problem is taken as a guide in the drawing, the precision of the tool is firstly confirmed, if the adjustment requirement exists, the adjustment is carried out, then the corresponding position precision is retested, then data analysis is carried out, and whether the existing state of the tool meets the tolerance or meets the matching requirement is confirmed. After the precision of the tool is measured, a measured part is positioned and fixed, targeted measurement is carried out according to a problem point, the size before welding is confirmed, then the assembly is welded, the self-made assembly after welding is also measured, the problem result is confirmed, the result meets the size requirement, the problem item is not satisfied, continuous analysis is not satisfied, and the reason is searched.

3. Experimental application of on-line matching technology

When a new vehicle type is carried and the size of the vehicle is prepared for production, an online matching synchronous working mode is applied in the test. As shown in fig. 8, the joint arm chuck placing position is reserved on the base plate of the checking fixture, and when the front end frame problem is analyzed, the sufficient joint arm coverage range ensures the synchronous operation of the checking fixture measurement and the part measurement. A great deal of time is saved from the occurrence of the problem to the solving of the problem (the whole process can be completed in a half working day).

Table 2 shows the comparison between the yield of the sub-assemblies in the conventional dimension breeding mode of a certain vehicle type and the yield of the sub-assemblies in the novel online matching mode. The qualification rate of the assembly is obviously improved in the online matching mode through the qualification rates of the floor, the four doors, the two covers, the top cover and the equal sub-assembly, and the improvement effect of the qualification rate of the new vehicle type production size in the online matching mode is obvious.

TABLE 2

Region(s)	Certain on-line matching vehicle	Certain tradition matching vehicle	Difference in
				Floor board	62％	55％	The improvement is 7 percent
Left side wall	76％	77％	Keep flat
				Right side wall	79％	78％	Keep flat
Left front door	78％	64％	The improvement is 12 percent
				Right front door	90％	68％	Increase by 22%
Left back door	82％	59％	Increase by 23%
				Right back door	76％	67％	The improvement is 9 percent
Front cover	56％	41％	The improvement is 15 percent
				Back cover	47％	51％	The reduction is 4 percent
Top cover	86％	63％	The improvement is 17 percent
				Framework	75％	72％	Increase by 3 percent

4. Superiority and inferiority of traditional matching and online matching

According to the size development work content in the new vehicle type production preparation process, analysis and comparison are respectively carried out from several dimensions of measurement basis, measurement conditions, effect evaluation and use range by combining the characteristics of respective modes of traditional matching and on-line matching. As shown in table 3.

Table 3 compares the advantages of the conventional matching with the on-line matching;

TABLE 3

As can be seen from the comparison in table 3, although the conventional matching mode is widely used, the following problems still exist: firstly, each set of clamp is used for detecting a digital-analog, and the digital-analog standards of the clamps are not uniform; secondly, the detection state of the clamp is static, and the actual working problem caused by factors such as the rigidity and the strength of the clamp cannot be truly reflected; the part data is not acquired in time and lacks data support; adjustment, production, measurement and analysis are not timely enough, so that the problem solving period is long; fixture, parts and process variation problems are mixed together, and the problem analysis difficulty is increased.

And in the online matching working mode, the clamp measurement, the part measurement, the clamp adjustment, the assembly measurement and the data analysis are synchronously completed on the clamp. Firstly, the inspection and measurement waiting period can be effectively shortened, and 2-3 working days are saved; secondly, the unique product digifax is utilized, so that the problems of clamp digifax with different procedures are avoided; and thirdly, realizing dynamic detection of the clamp and embodying the actual working state. The strength problem of the clamp is convenient to identify; fourthly, rapidly evaluating the state of the part and realizing rapid problem analysis; the part change of each process can be measured, and the locking of the cause of the problem is convenient.

Claims

1. An online matching method for a vehicle body is characterized by comprising the following steps:

step five: the cause of the problem is analyzed and a measurement report is derived.

2. The on-line matching method for the vehicle body according to claim 1, characterized in that:

further comprises the following steps: adjusting a tool and manually repairing parts;

Step seven: repeating the processes from the third step to the sixth step;

3. The on-line matching method for the vehicle body according to claim 1, characterized in that:

the matching tool comprises a clamp and a detection tool, the parts refer to one or more parts to be matched, the parts need to be positioned and fixed according to the reference position of the clamp or the detection tool, and then the measurement equipment is fixed;

the measuring equipment comprises a joint arm and a laser tracker, the joint arm is divided into a joint arm main body, a sucker, a power line and a network cable, the sucker is adsorbed on the tool base plate, the joint arm main body is in threaded connection with the sucker, the power line is connected to the voltage stabilizing battery, and the network cable is connected with a computer.

4. The on-line matching method for the vehicle body according to claim 3, characterized in that:

the tool substrate has insufficient space for placing the sucker or the tool is vertical, and the measuring equipment needs to be fixed by a platform plate or a measuring bracket;

5. The on-line matching method for the vehicle body according to claim 3, characterized in that:

the arm length of the articulated arm is 3.5 meters or 4 meters;

6. The on-line matching method for the vehicle body according to claim 5, characterized in that:

the laser tracker is connected with the measuring support through threads.

7. The on-line matching method for the vehicle body according to claim 1, characterized in that:

after the calibration of the measuring equipment is finished, establishing a coordinate system to start measurement, adopting a 3-2-1 system establishing principle, namely, punching 3 points on a tool substrate to determine a plane, and then measuring two measuring reference holes, namely 2 points to determine a straight line, wherein 1 hole controls 1 direction, the other hole controls 2 directions, the hole controlling 2 directions is a circle A (20), and the central point of the circle A (20) is the origin;

8. The on-line matching method for the vehicle body according to claim 7, characterized in that:

9. The on-line matching method for the vehicle body according to claim 8, characterized in that:

the method specifically comprises the following steps:

after the precision of a base plate, a reference hole, a reference ball, a positioning pin, a positioning surface, a positioning groove, a limiting block, a guide pin and a guide block of the tool is confirmed to be in accordance with tolerance, a corresponding part is installed, the positioning position is based on reference information on general geometric dimension tolerance, the fitting condition of the positioning surface is verified after the part is positioned, a pressure head is used for clamping after the part is confirmed to be correct, the part is measured, and comprises a supply grade single part, a supply grade assembly, a molded surface, trimming and outline dimensions of a self-made assembly, the planeness of the molded surface, hole surfaces and position degrees of a process hole and an installation hole, the position degree and the coaxiality of a stud, the parallel difference of a local molded surface, the parallel difference of a local outline and the functional dimension between holes, and a measurement software polyworks displays a measurement result, comprises a theoretical value, an actual measurement value and a deviation value; the control direction deviation to be displayed is selected in the measurement software, polyforks, by "geometric control".

10. The on-line matching method for the vehicle body according to claim 9, characterized in that: