Large-sized workpieces in process geometric measuring systems based on machine vision

Abstract

The invention discloses a geometry measure system for a large workpiece in progress based on machinery vision. The system comprises an installation block of a machinery arm, a machinery arm, a camera, a light source frame, a digital control module of the machinery arm, an image collecting card and a computer. The installation block of the machinery arm is a convenient interface component for a built-in stepper motor and a transmission gear and is arranged on the shell of a machine tool spindle or a work-platform. The machinery which can stretch in a two-dimensional plane and rotate around two shafts is arranged on the installation block of the machinery arm, moreover, the terminal of the machinery arm clamps the camera; the light source frame is arranged on the upward side of the workpiece. One end of the digital control module of the machinery arm is connected with the machinery arm and the other end is connected with the computer. The computer is also connected with the camera through the image collecting card. The measure system adopts the camera to take the image of the measured object and calculates measurement result after image analysis; the system fully adopts the visible image method and has no requirement for a laser light source, a laser gauge head, a contact-type trigger gauge head and other mechanisms, moreover, the system saves the expensive cost of the laser mechanism and is not limited by the contact-type measurement method.

Description

Technical field [0001] The invention relates to a method and a device for measuring a product in process, in particular to a method and a system for detecting a three-dimensional geometric shape and size of a large in-process workpiece based on machine vision. Background technique [0002] At present, the geometric processing quality control system of parts in the machinery manufacturing industry is established on the basis of off-machine inspection after processing, and contact measurement is the main method. Although contact measuring equipment such as coordinate measuring machine has high measurement accuracy, the workpiece must be removed from the processing machine tool and installed on the measuring machine for inspection. Once the processing size and shape and position accuracy are found to be unqualified, it should be installed on the processing machine tool for reprocessing. , Positioning and processing often accumulate out of tolerance. Passive inspection after the fact...

AI Technical Summary

Problems solved by technology

Although contact measuring equipment such as three-coordinate measuring machines has high measurement accuracy, the workpiece must be removed from the processing machine tool and then installed on the measuring machine for testing. , positioning and processing often accumulate out-of-tolerance

At present, there is no two-dimensional plane video measuring instrument that can be applied on processing machine tools, nor is there any instrument that only uses video method to adapt to three-dimensional measurement of large workpieces, and there is no workpiece three-dimensional video measuring instrument that can be directly applied on processing machine tools

Images