Sampling simulation layout strategy of articulated coordinate measuring machine based on virtual prototype

Abstract

The invention discloses a virtual-prototype-based sampling simulation point arrangement strategy for an articulated coordinate measuring machine. The strategy is characterized in that a six-degree-freedom articulated coordinate measuring machine virtual prototype is constructed in mechanical system dynamic analysis software; rotation pair units are added to all joints of the virtual prototype, a ball pair unit is arranged at the top of a measuring head and a constraint measuring head is arranged at a sampling point, so that construction of a single-point virtual prototype is completed; a first joint, a second joint, a third joint, a fourth joint, a fifth joint, and a sixth joint are selected successively as driving joints and make rotation in a stepping mode according a set angle and a set step pitch to drive other joints to make rotation, so that the virtual prototype can have different attitudes; and six joint angle in a single-point multi-attitude mode are collected and thus a round coding device measurement value is obtained. With known error characteristics of the six round coding devices and the round coding device measurement value in a multi-attitude mode of the sampling point, calculation is carried out to obtain a measurement error of the point due to an angle measurement error; and then a method for analyzing a single-point measurement error is popularized to the whole space, so that enough data samples can be used for carrying out an optimal measurement zone analysis.

Description

technical field [0001] The invention relates to a sampling simulation method and point layout strategy of an articulated coordinate measuring machine based on a virtual prototype, which are applied in the technical field of coordinate measurement. Background technique [0002] The articulated coordinate measuring machine is a space open-chain series structure formed by connecting multiple rods through rotating joints. It has the advantages of wide measurement space, easy operation, portability, no special requirements for the use environment, and easy online measurement. It is widely used in quality control of various geometric parts, reverse engineering of products, computer-aided inspection of mold manufacturing, online or offline inspection of product processing and assembly, etc. [0003] The six-degree-of-freedom articulated coordinate measuring machine has each measuring arm, each joint, each circular encoder, and a measuring head. Each measuring arm is the first arm, ...

AI Technical Summary

Problems solved by technology

However, for a sampling point in space, it is difficult to obtain the six angle values ​​under multiple attitudes in a computational way

[0007] Virtual prototyping technology is a new technology, which can intuitively express product appearance, spatial relationship, kinematics and dynamics characteristics through computer simulation. Attitude movement, and the output of six circular encoder angles under each attitude, and a reasonable distribution strategy for sampling points have not been reported so far

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