CN114322874A - Body-in-white measuring method and system - Google Patents
Body-in-white measuring method and system Download PDFInfo
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- CN114322874A CN114322874A CN202111616653.9A CN202111616653A CN114322874A CN 114322874 A CN114322874 A CN 114322874A CN 202111616653 A CN202111616653 A CN 202111616653A CN 114322874 A CN114322874 A CN 114322874A
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Abstract
The invention provides a body-in-white measuring method and a body-in-white measuring system, which relate to the field of automobiles and can directly judge the gap, surface difference and interference conditions between a product and a body-in-white, and the method comprises the following steps: acquiring a body-in-white measurement requirement comprising a plurality of points to be measured; generating a whole vehicle measuring program of a whole vehicle measuring point and a plurality of measuring programs corresponding to a plurality of measuring points according to the white vehicle body measuring requirement; executing the whole vehicle measurement program under a whole vehicle coordinate system to output all local coordinate systems corresponding to the multiple points to be measured; and executing the corresponding measurement program to be measured under each local coordinate system to output a measurement report containing the measurement data of the plurality of points to be measured.
Description
Technical Field
The invention relates to the field of automobiles, in particular to a body-in-white measuring method and system.
Background
The manufacturing system of the vehicle body is huge and often comprises hundreds of stamping parts, dozens of sets of tool fixtures and hundreds of processes; the process flow is long and complicated, so that the deviation sources of the size variation of the vehicle body are many, and the control of the size and the quality of the vehicle body is very difficult. In order to monitor the size and quality of a vehicle body, the white vehicle body must be measured in a manufacturing stage, and in the prior art, a large-scale three-coordinate measuring machine is generally used for measuring the full size of the white vehicle body, and thousands of three-coordinate measuring points of the white vehicle body need to be measured in the measuring process. The inventors believe that the current methods of measuring body-in-white suffer from the following problems: the measurement device is installed on a white vehicle body, and the reference influencing the relative size of the measurement device and the vehicle body is a product installation reference rather than a white vehicle body reference, so that the clearance, the surface difference and the interference condition between a product and the white vehicle body cannot be directly judged by data obtained by the conventional measurement method, so that the product installation needs to be corrected for many times, and the installation matching time period is long.
In the existing published literature, a method for establishing a body-in-white model is disclosed, wherein parameter data of a body-in-white of a new vehicle type is divided into a plurality of local module data, the local module data is compared with first module data of the same vehicle type in a module database, and whether the local module data is the same as or similar to the first module data is judged one by one so as to improve the precision of the body-in-white model in a vehicle concept design stage. However, the measurement method involved in the method for establishing the body-in-white model is mainly used for body modeling, and although the body is divided into a plurality of local features, the gap, the surface difference and the interference condition between the product and the body-in-white can not be directly judged in the early stage of manufacturing.
Disclosure of Invention
An object of the first aspect of the present invention is to provide a body-in-white measuring method, which is capable of directly determining the gap, surface difference and interference between the product and the body-in-white by establishing a local coordinate system for key features of the body-in-white at an early stage of manufacturing to measure other features matching the key features.
A further object of the present invention is to simplify the body-in-white measurement procedure.
It is an object of the second aspect of the present invention to provide a body-in-white measuring system capable of directly determining the gap, surface difference and interference between the product and the body-in-white.
In particular, the invention provides a body-in-white measuring method, comprising the following steps:
acquiring a body-in-white measurement requirement comprising a plurality of points to be measured;
generating a whole vehicle measuring program of a whole vehicle measuring point and a plurality of measuring programs corresponding to a plurality of measuring points according to the white vehicle body measuring requirement;
executing the whole vehicle measurement program under a whole vehicle coordinate system to output all local coordinate systems corresponding to the multiple points to be measured;
and executing the corresponding measurement program to be measured under each local coordinate system to output a measurement report containing the measurement data of the plurality of points to be measured.
Further, the whole vehicle measurement program for generating the whole vehicle measurement point and the multiple measurement programs to be measured corresponding to the multiple measurement points according to the white vehicle body measurement requirement comprises the following steps:
generating a whole vehicle measurement file of a whole vehicle measuring point and a plurality of to-be-measured measurement files corresponding to a plurality of to-be-measured points according to the white vehicle body measurement requirement, wherein the whole vehicle measurement file comprises all to-be-measured characteristics;
and generating a whole vehicle measuring program of the whole vehicle measuring point according to the whole vehicle measuring file, and generating a plurality of to-be-measured measuring programs corresponding to a plurality of to-be-measured points according to the plurality of to-be-measured measuring files.
Further, in the step of generating a whole vehicle measurement program of a whole vehicle measurement point according to the whole vehicle measurement file, and generating a plurality of measurement programs to be measured corresponding to a plurality of measurement points according to the plurality of measurement files to be measured:
and writing repeated operation and standard parameter setting into code blocks by using a macro programming technology, and performing modular operation to compile the whole vehicle measuring program and the plurality of measuring programs to be measured.
Further, before executing the entire vehicle measurement program in the entire vehicle coordinate system to output all local coordinate systems corresponding to the multiple points to be measured, the method includes the following steps:
and sequencing the whole vehicle measuring program and the plurality of measuring programs to be measured, and taking the whole vehicle measuring program as a first execution program.
Further, in the step of executing the corresponding measurement program to be measured in each local coordinate system to output the measurement report including the measurement data of the plurality of points to be measured, the plurality of measurement programs to be measured are sequentially executed according to the sequence until the measurement data of all the points to be measured are output.
Further, the entire vehicle coordinate system and the local coordinate system are both generated by a measurement server.
Further, in performing the measurement, the body-in-white is measured using a three-coordinate measuring machine.
Particularly, the invention also provides a body-in-white measuring system which comprises a control device and a processor, wherein the control device comprises a memory and the processor, the memory stores a control program, and the control program is used for realizing the body-in-white measuring method when being executed by the processor. .
According to the measuring method provided by the invention, a local coordinate system is established for the key features of the body-in-white at the early stage of manufacturing to measure other features matched with the key features, so that the gap, surface difference and interference condition between the product and the body-in-white can be directly judged, the gap, surface difference and interference condition between the product and the body-in-white can be more conveniently judged, and the product installation matching time period is shortened; meanwhile, the measurement is not required to be carried out for multiple times, so that the body-in-white measurement step is simplified.
Furthermore, in the measuring method provided by the invention, a part of features are measured under the local coordinate system of each reference feature, and the part of features are also measured under the coordinate system of the whole vehicle, so that the uniform tracking investigation is convenient to carry out at the later stage.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic illustration of the steps of a body-in-white measurement method according to one embodiment of the present invention.
Detailed Description
FIG. 1 is a flow chart of a body-in-white measurement method according to one embodiment of the invention. The measuring method in the embodiment is used for measuring the body-in-white to obtain measuring data and guiding the installation of a specific product on the body-in-white, selecting a reference feature from the features to be measured, establishing a local coordinate system by taking the reference feature as a reference, and then measuring the features associated with the reference feature in the local coordinate system, so that the gap, the surface difference and the interference condition between the product and the body-in-white are judged, and the product installation matching time period is shortened.
In this embodiment, the vehicle body measurement is divided into a measurement process in the entire vehicle coordinate system and a measurement process in the local coordinate system, and the two measurement processes may be performed simultaneously.
Specifically, the body-in-white measuring method in the embodiment includes the following steps:
s1, acquiring a body-in-white measurement requirement comprising a plurality of points to be measured;
s2, generating a whole vehicle measuring program of a whole vehicle measuring point and a plurality of measuring programs corresponding to a plurality of measuring points according to the white vehicle body measuring requirement;
s3, executing the whole vehicle measurement program under a whole vehicle coordinate system to output all local coordinate systems corresponding to the multiple points to be measured;
and S4, executing the corresponding measurement program under each local coordinate system to output a measurement report containing the measurement data of the multiple points to be measured.
The method comprises the steps of obtaining a white body measurement requirement comprising a plurality of points to be measured, selecting reference features to be measured from all the features to be measured, and generally selecting the features to be measured according to the opening principle of a body. Furthermore, the headlights, rear lights, front overhang and rear overhang regions also need to incorporate the reference features to be measured. Before the reference feature to be measured is selected from all the features to be measured, a body-in-white measurement requirement needs to be collected, for example, the body-in-white measurement requirement is a first mounting hole and a second mounting hole on the left front door, and then the opening area of the left front door is determined to be the reference feature.
More specifically, a server may be used to run a demand collection system to further collect measurement demands of body-in-white measurement requesters (typically process engineers) and submit local coordinate system measurement demands to a demand management system also running in the server.
More specifically, in step S2, the server is used to store all the features to be measured, and mark the reference features to be measured therein, so as to operate the local coordinate system establishment program when any one of the reference features is measured, thereby generating a whole vehicle measurement program of a whole vehicle measurement point and a plurality of measurement programs corresponding to a plurality of measurement points according to the measurement requirement of the body-in-white, it can be understood that the reference features in the local coordinate system are also measured in the whole vehicle coordinate system at the same time, so that all the features can be measured once or more times in the whole vehicle coordinate system and the local coordinate system, and thus the difference is obtained by comparison. When all the features to be measured are stored, all the features to be measured need to be numbered so as to be convenient for measurement according to the numbers, thereby avoiding measurement procedure disorder easily caused by random measurement and simultaneously ensuring the measurement efficiency. It is understood that in the actual measurement process, this step is performed using a measurement point file, and will not be described herein.
In a specific implementation scenario, for example, a process of establishing a local coordinate system with reference to a left front door opening area is performed, and a specific measurement is performed by using a three-dimensional measuring apparatus, the specific measurement method includes the following steps:
s100: the method comprises the following steps that a body-in-white measurement demander submits a measurement requirement of a local coordinate system of an opening area of a left front vehicle door to a requirement management system according to the installation characteristic of the left front vehicle door to be installed on a body-in-white;
s200: the requirement management system pushes requirements to measuring point makers and measuring staff, after three-party agreement (meaning that a measuring demander, the measuring point makers and the measuring staff confirm) is quickly achieved in the requirement system, corresponding measuring point files are made by the measuring point makers, the requirements of the size and tolerance required to be controlled in the left side vehicle door opening area are set and recorded in the measuring point files, and usually, after an engineer measures measuring points and records various data, the data are input through tabulation software;
in addition to the left front door opening area in this embodiment, in the actual production process, it is also possible to measure other n areas, so that the measurement point maker finally outputs 1+ n measurement point files, which include a measurement point file in the whole vehicle coordinate system and n measurement point files in the local reference coordinate system.
S300: measuring programmers use a macro programming method to program corresponding measuring programs according to measuring point files in a demand management system, and can understand that thousands of features need to be measured in the measuring point files under a whole vehicle coordinate system, so that the measuring sequence of the thousands of features needs to be confirmed in the measuring point files in a numbering mode; similarly, in the measurement point file under each local coordinate system, the associated measurement sequence in the measurement point file needs to be confirmed in a numbering manner.
S400: uploading all the measurement programs to a measurement order management system, placing the measurement program in a finished automobile coordinate system at a first execution position in the system, executing the measurement program in the finished automobile coordinate system during measurement, automatically executing the measurement of all the characteristics to be measured by the measurement program, and outputting a local coordinate system established by taking the marked reference characteristics as references after the measurement program in the finished automobile coordinate system is finished because the selected reference characteristics are marked in the step S300. And then the order management system sequentially operates each local coordinate system measuring program, and the subsequent local coordinate system measuring program automatically calls the measuring data output by the previous local coordinate system measuring program and outputs a measuring report.
S500: and (3) looking up the measured value of the corresponding measuring point in the measurement report by a person, and judging the matching condition of the product and the vehicle body after the left front vehicle door is installed on the vehicle body according to the measured value, so that the gap, the surface difference and the interference condition of the product and the white vehicle body are judged, the white vehicle body rectification and modification suggestion is provided, and the product installation matching time period is shortened.
More specifically, when the local coordinate system is established, the coordinate system is established with the local part of the body-in-white as a base point, for example, the coordinate system is established with the bent part of the a-pillar of the body-in-white as a coordinate origin.
Specifically, the demand management system is a system capable of performing information management, and in this embodiment, the system is disposed in a server in a software manner, and includes an object management module and a demand template management module, where the object management module is configured to obtain identification information of a managed object, the demand template management module is configured to establish a demand template of the managed object according to the identification information of the managed object, the demand template is configured to record a demand of the managed object, and the demand is configured to establish a local coordinate system at a certain position on a body in white.
The above-mentioned maker can be replaced with a server that automatically performs the making of the station files. The three-dimensional coordinate measuring machine may be replaced with a measuring person or a robot.
In step S200, specifically, the measurement point file is a measurement point file commonly used in the art, and the measurement point file sets and records the requirements of the dimension and the tolerance that need to be controlled in the development of the vehicle body, and is an important basis for performing matching debugging in the process of developing the measurement point of the entire vehicle. Usually, an engineer measures the measuring points and records various data, and then the data is input through a tabulation software. The specific data recorded in the station file in the embodiment comprises the requirements of the dimension and the tolerance of the body-in-white needing to be controlled.
Specifically, in the above-mentioned 1+ n measuring point files, since there is one measuring point file in the entire vehicle coordinate system, the measuring point file needs to include all reference features of all local references, and also needs to include all measuring points that are not defined in the local coordinate system, and may also include associated features in the local coordinate system. The related features refer to features that can be measured more accurately in a local coordinate system after the local coordinate system is established, for example, in the opening area of the front left side door in the embodiment, a first mounting hole and a second mounting hole are arranged, and are features that need to be measured, but specific angles of the first mounting hole and the second mounting hole are difficult to measure under the whole vehicle coordinate system, and in the local coordinate system taking the opening area of the front left side door as a reference, a coordinate system convenient for measuring angles of the first mounting hole and the second mounting hole can be established, for example, a Z axis of the coordinate system is parallel to the first mounting hole, and only an angle of the second mounting hole relative to the first mounting hole needs to be measured.
Specifically, the macro programming method refers to: when programming, a series of instructions capable of completing a certain function are stored in the memory, and they are called by using a general instruction, and when it is used, said series of instructions stored can be used for implementing its function only by giving said general instruction, and is called user macro program self-body. Therefore, when programming using a macro program, the programmer simply keeps track of the macro instructions and does not have to remember the macro program.
In yet another embodiment, the demand collection system may be replaced with traditional meeting, mail, file forms; the conventional programming method can be used instead of the macro programming method; all measurement procedures were measured manually in sequence instead of the measurement order management system.
Particularly, the invention also provides a body-in-white measuring system which comprises a control device and a processor, wherein the control device comprises a memory and the processor, the memory stores a control program, and the control program is used for realizing the body-in-white measuring method when being executed by the processor. .
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (8)
1. A body-in-white measuring method is characterized by comprising the following steps:
acquiring a body-in-white measurement requirement comprising a plurality of points to be measured;
generating a whole vehicle measuring program of a whole vehicle measuring point and a plurality of measuring programs corresponding to a plurality of measuring points according to the white vehicle body measuring requirement;
executing the whole vehicle measurement program under a whole vehicle coordinate system to output all local coordinate systems corresponding to the multiple points to be measured;
and executing the corresponding measurement program to be measured under each local coordinate system to output a measurement report containing the measurement data of the plurality of points to be measured.
2. The body-in-white measuring method according to claim 1, wherein the generating of the whole vehicle measuring program of the whole vehicle measuring point and the plurality of measuring programs corresponding to the plurality of measuring points according to the body-in-white measuring requirement comprises the following steps:
generating a whole vehicle measurement file of a whole vehicle measuring point and a plurality of to-be-measured measurement files corresponding to a plurality of to-be-measured points according to the white vehicle body measurement requirement, wherein the whole vehicle measurement file comprises all to-be-measured characteristics;
and generating a whole vehicle measuring program of the whole vehicle measuring point according to the whole vehicle measuring file, and generating a plurality of to-be-measured measuring programs corresponding to a plurality of to-be-measured points according to the plurality of to-be-measured measuring files.
3. The body-in-white measuring method according to claim 2, wherein in the step of generating a whole vehicle measuring program of a whole vehicle measuring point according to the whole vehicle measuring file and generating a plurality of measuring programs corresponding to a plurality of measuring points according to the plurality of measuring files to be measured:
and writing repeated operation and standard parameter setting into code blocks by using a macro programming technology, and performing modular operation to compile the whole vehicle measuring program and the plurality of measuring programs to be measured.
4. The body-in-white measuring method according to claim 1, wherein before executing the entire vehicle measuring program under the entire vehicle coordinate system to output all local coordinate systems corresponding to the plurality of points to be measured, the method comprises the steps of:
and sequencing the whole vehicle measuring program and the plurality of measuring programs to be measured, and taking the whole vehicle measuring program as a first execution program.
5. The body-in-white measuring method according to claim 4, wherein in the step of executing the corresponding measuring program to be measured under each local coordinate system to output the measurement report including the measurement data of the plurality of points to be measured, the plurality of measuring programs to be measured are sequentially executed in order until the measurement data of all the points to be measured are output.
6. The body-in-white measurement method according to claim 1, wherein the full vehicle coordinate system and the local coordinate system are both generated by a measurement server.
7. The body-in-white measuring method according to claim 1, wherein the body-in-white is measured using a three-coordinate measuring machine when the measurement is performed.
8. A body-in-white measuring system comprising a control device including a memory and a processor, the memory having stored therein a control program for implementing the body-in-white measuring method according to any one of claims 1 to 7 when executed by the processor.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116576787A (en) * | 2023-04-14 | 2023-08-11 | 南京航空航天大学 | Gap surface difference measurement method and measurement device based on mechanical arm cooperation |
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