A device and method for measuring the size of a rocker arm assembly

Abstract

The invention relates to device and method for measuring dimension of a part, and specifically relates to device and method for measuring the dimension of a rocker arm combination part. According to the technical scheme, the measuring device comprises base, a positioning holding mechanism and a measuring mechanism; the positioning holding mechanism comprises a cylinder, a bracket, a pressing claw, a first hinge pin, a propping block, a second hinge pin, a propping rod, a clamping spring and a holding pressing cover; the measuring mechanism comprises a dial indicator stand, a lever, a third hinge pin, a spring, a plug screw, a dial indicator clamp and a dial indicator. The measuring method comprises the following steps: (1) calibrating the dial indicator through a standard part; (2) dismounting the standard part; (3) inserting an upset pin of the measured rocker arm combination part into an inner hole of the clamping spring to obtain the true dimension from the center of the upset pin of the measured rocker arm combination part to the end surface of a square positioning hole; (4) dismounting the measured rocker arm combination part; (5) repeating the steps (3) and (4) to realize mass measurement. With the adoption of the device and method, accurate positioning and measuring can be performed for the upset pin and the square positioning hole of the rocker arm combination part.

Description

technical field [0001] The invention relates to a component size measuring device and a measuring method, in particular to a rocker arm assembly size measuring device and a measuring method. Background technique [0002] The rectifying blades of the aero-engine are controlled by the rocker arm assembly. After the rocker arm assembly is processed, it is assembled on the compressor casing, and the rotation of the rectifying blades is adjusted through the linkage ring. Among them, the dimensional measurement from the center of the upsetting pin of the rocker arm assembly to the end face of the positioning square hole is very important, which affects the working state of the rectifying blade of the engine. [0003] The traditional rocker arm assembly size measurement method can only measure the distance from the outer diameter of the upset pin of the rocker arm assembly to the measuring end surface through auxiliary tools. This measurement method cannot reflect the actual distan...

AI Technical Summary

Problems solved by technology

[0003] The traditional rocker arm assembly size measurement method can only measure the distance from the outer diameter of the upset pin of the rocker arm assembly to the measuring end surface through auxiliary tools. This measurement method cannot reflect the actual distance from the center of the upset pin to the measured end, and will The diameter tolerance of the upset pin is added to the measured size, resulting in inaccurate measured data, and the unqualified size of the rocker arm assembly affects the working status of the rectifier blades, resulting in the normal use of the aero-engine

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