A method and device for evaluating compound position error
A composite position degree and error evaluation technology, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems that the composite position degree error evaluation cannot be accurately realized
Active Publication Date: 2018-03-23
BEIJING INSTITUTE OF TECHNOLOGYGY
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[0004] The technical problem to be solved by the present invention is to provide a method and device for compound position degree error evaluation to solve the problem that the prior art cannot accurately realize compound position degree error evaluation
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[0057] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.
[0058] According to the definition of compound position error in ASME (American Society of Mechanical Engineers, American Society of Mechanical Engineers), the compound position error is the allowable variation of each actual element between each other or with respect to one or more reference positions, that is, The limit range that the actual position after processing is allowed to deviate from the ideal position specified by the design. In the prior art, with the development of CMM (Coordinate Measuring Machining, Coordinate Measuring Machine) technology, it becomes possible to use a geometric algorithm to realize compound error degree error evaluation for discrete measurement points based on CMM.
[0059] At present, scholars have proposed a large num...
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The invention provides a method and device for evaluating compound positional errors, which relate to the field of mechanical engineering and solve the problem that the prior art cannot accurately evaluate compound positional errors. The method for evaluating compound positional errors includes: obtaining products to be evaluated According to the geometric feature information and composite position error setting information; according to the geometric feature information, obtain the theoretical constraint information of the functional geometry and the reference geometry of the product to be evaluated; according to the theoretical constraint information of the functional geometry and reference geometry and the composite position error Set the information and establish the theoretical mathematical model of the compound position error of the product to be evaluated; use the convex hull theory of computational geometry to construct a three-dimensional convex hull for the discrete sampling points of the product to be evaluated in advance; according to the three-dimensional convex hull and the theoretical mathematical model, Evaluate the compound position error of the product to be evaluated. The solution of the invention effectively realizes the accurate evaluation of the compound position error.
Description
technical field [0001] The invention relates to the field of mechanical engineering, in particular to a method and device for evaluating compound positional errors. Background technique [0002] Due to the influence of factors such as machine tool fixtures, tools, and process operation levels, there are inevitably differences between the surface of machined parts and the ideal surface. In order to ensure the assembly quality of the product, it is necessary to measure the geometric error of the product before assembly. Guarantee the geometric design requirements of the product. [0003] Although a lot of progress has been made in the measurement and evaluation of geometric errors, the evaluation of compound position errors is still one of the problems that plague scholars. Although functional gauges can realize the judgment of compound position errors, they cannot provide composite position errors. The exact value of the degree of error. Contents of the invention [0004]...
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IPC IPC(8): G06F19/00
Inventor 刘检华丁晓宇郭崇颖刘少丽鲍强伟
Owner BEIJING INSTITUTE OF TECHNOLOGYGY