Measuring method of small hole position degree

Abstract

The invention relates to a method for measuring the position degree of a small hole. A projection coordinate instrument is used as a measuring device, a standard part is used as a reference, a mechanical measuring head and an optical measuring head are calibrated and associated, a coordinate system is established through the mechanical measuring head, and the optical measuring head is used as a reference. The head measures the position of the small hole, which achieves the purpose of measuring the position of the small hole. The invention utilizes the mutual cooperation of the optical measuring head and the mechanical measuring head of the equipment, not only realizes the purpose of small hole measurement, but also has high measuring precision, and the whole measuring scheme is simple, reasonable and easy to operate.

Description

technical field [0001] The invention relates to a measuring method, in particular to a measuring method for the position degree of a small hole. Background technique [0002] In the mechanical field, some small holes are sometimes processed on parts to meet some functional requirements. Such as fuel injectors. When processing small holes, small hole drilling templates are usually used to ensure the processing requirements of parts, so the requirements for the position and diameter of small hole drilling templates are very strict. And sometimes the hole diameter of the small hole drilling template is very small, below Φ1.00mm, the position of such a small hole cannot be directly measured by a three-dimensional coordinate measuring machine. Currently commonly used methods include the following: [0003] 1. Match the corresponding hole diameter with the corresponding rolling rod. After insertion, the round hole becomes a cylinder and is measured with three coordinates. Howev...

AI Technical Summary

Problems solved by technology

Clamping takes a long time and the detection efficiency is extremely low

Insertion rod measurement also introduces errors, similar to three-coordinate measurement, the accuracy cannot be guaranteed;

[0005] 3. It is detected on a universal tool microscope, but some drilling jigs are large and exceed the range of measurement

Some ranges are allowed, but other elements such as the corresponding position reference must be measured with top light, and the measurement error of top light is large, and every time an element is measured, the optical lens needs to be raised and lowered, which introduces focusing errors, making it even more impossible Guaranteed accuracy