Reverse method based on CAD model modification and measurement path planning

Abstract

The invention relates to a reverse method based on CAD model modification and measurement path planning for designing and machining machine pieces, which belongs to the technical field of mechanical reverse engineering. The technical scheme comprises the following steps of: 1, establishing an approximate initial model of a workpiece in UG NX4.0 software; 2, selecting key geometric elements to plan a measurement path; 3, creating a primary measurement program according a path file; 4, executing the primary measurement program to measure the measured elements; 5, reconstructing the measured elements; 6, modifying the initial model; and 7,creating a numerically controlled code according to the final CAD model, and transferring the code to a numerically controlled process plant to realize piece machining and reverse process. The reverse method adopts a design of model modification, gives full play to the subjective capability of man, and only measures and reconstructs the key geometric elements that require high precision, thereby greatly simplifying the measurement process and reconstruction algorithm. The path planning based on UG NX4.0 model space and the automatic generation of the measurement program ensures the safety, the rapidity and the precision of the measurement.

Description

Technical field: [0001] The invention relates to a reverse method based on CAD model correction and measurement path planning, which is used for the design and processing of mechanical parts and belongs to the technical field of mechanical reverse engineering. Background technique: [0002] Reverse engineering, also known as reverse engineering, refers to the fact that designers use certain measuring equipment to digitally process existing parts prototypes, and then obtain CAD models based on the measured data, generate numerical control codes, and process new parts. The process of parts. The implementation of reverse engineering requires high-precision measuring equipment and professional reverse software. The former widely uses three-coordinate measuring machines, and the latter is mostly general commercial software. Most of the above-mentioned equipment and software are expensive, and many SMEs are unable or unwilling to purchase them. With the large-scale use of machining c...

AI Technical Summary

Problems solved by technology

However, in this system, if all the components of the workpiece are measured according to the conventional thinking, a large amount of measurement point data will be required, which will make the measurement process very long, the amount of data information processing will be very large, and there will be complex surfaces that are difficult to fitting problem

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