A measuring device and measuring method for the position and size of trapezoidal grooves in inner holes of parts

Abstract

A measuring device and a measuring method for the position dimension of the inner hole trapezoidal slot of a part are provided. The measuring device is composed of a dial gauge, a center shaft, a measuring cylinder and a reference base. During measurement, a measured part is placed on a workbench. The reference base of the measuring device is extended into the hole of the measured part to make thebottom end face of the reference base contact the bottom of the hole. The measuring cylinder is rotated, and the measuring head is extended into the inner hole trapezoidal slot to make the measuringhead contact the slope of the inner hole trapezoidal slot. The deviation of the pointer of the dial gauge relative to the zero position is recorded. The actual value of the position dimension of the inner hole trapezoidal slot is obtained by adding the deviation of the dial gauge to the median value of the position dimension of the inner hole trapezoidal slot of the measured part. The measurementof the position dimensions of an inner hole trapezoidal slot and an inner hole slope slot at precision below IT8 can be carried out. The measurement data is stable, the operation is simple, and the measurement is quick. In addition, the measuring device and the measuring method of the invention can be widely used in a variety of occasions needing measurement of the position dimension of the innerhole trapezoidal slot.

Description

technical field [0001] The invention belongs to the technical field of measurement, and in particular relates to a measuring device and a measuring method for the position and size of a trapezoidal groove in an inner hole of a part. Background technique [0002] Such as Figure 8 As shown in , it is a schematic diagram of the half-section structure of the part to be tested. The dimension of the trapezoidal groove in the inner hole of the part is φD 2 H12 is measured with a vernier caliper on the inner hole diameter, the angle α is guaranteed by the tool, and the position dimension of the trapezoidal groove LH10 is the intersection line between the slope of the inner hole trapezoidal groove and the inner surface of the hole to the hole φ D 1 The distance dimension at the bottom of H7 has a dimensional accuracy of H10 level, and some require IT8 level, and there is no standard measuring tool for measurement. At present, the measurement of the position and size of the trapezoi...

AI Technical Summary

Problems solved by technology

The indirect measurement method has low efficiency and large measurement error. It is mainly used in the case of low precision and single-piece production. This measurement method has high requirements for the skills of the measurement personnel.

The three-coordinate measuring machine is mainly used for random inspection of parts. It has high measurement accuracy and requires professionals to measure. The measurement efficiency is low and the measurement cost is high. It is not suitable for measurement on the production site.

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