On-line engine cylinder hexahedral hole set position error detecting method

Abstract

The invention relates to a technology of mechanical measurement and visual inspection. In order to solve the problem that the positioning precision is not high, thus directly affecting the final measuring precision, the invention adopts the following technical scheme that an on-line engine cylinder hexahedral hole set position error detecting method comprises the following steps: measuring cylinder bottom positioning pin holes by using two plane array positioning cameras so as to precisely position a cylinder; obtaining mapping relationships between a computer image coordinate system and two area array CCD (charge coupled device) measuring camera coordinate systems, selecting two representative measured holes on each surface of the cylinder, and performing imaging measurement on the measured holes by using the two area array CCD measuring cameras; in the measuring process, calibrating a coordinate conversion relationship each camera coordinate system and a target world coordinate system by using a special calibrating target; and converting the measurement result of each measured hole in the target world coordinate system into the world coordinate system of the measured cylinder, thus obtaining the final required measurement result. The on-line engine cylinder hexahedral hole set position error detecting method is mainly applied to the mechanical measurement.

Description

technical field [0001] The invention relates to mechanical quantity measurement and visual detection technology, in particular to an on-line detection method for the position error of the six-face hole group of the engine cylinder block. Background technique [0002] The engine block is the core component of the engine, and its six-face group has strict positional tolerance requirements, which is directly related to the assembly quality of peripheral parts such as cylinder heads and the quality of the final product. The three-coordinate machine is widely used in the position measurement of the cylinder six-face group in the modern engine production line. The three-coordinate machine has good measurement flexibility, but its detection efficiency is low, and it has high requirements on the test environment, so it cannot be directly applied to the production line. This situation is difficult to meet the automatic, fast and online detection requirements of the production line. ...

AI Technical Summary

Problems solved by technology

The three-coordinate machine has good measurement flexibility, but its detection efficiency is low, and it has high requirements for the test environment, so it cannot be directly applied to the production line

However, measuring the positions of all the holes on the six faces of the engine block requires a lot of array CCD cameras, which is costly and difficult in application.

This method cannot be directly applied

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