Device and method for measuring pressure surface angle of dovetail-type blade tenon

Abstract

The invention relates to a device and a method for measuring a pressure surface angle of a dovetail-type blade tenon. The device comprises a base on which a positioning block is mounted. The base is provided with an oblique surface. The oblique surface is attached to the left end surface of the positioning block, thereby forming an acute-angle area. The positioning block is provided with a dial gauge and a slidable movable measuring pin, wherein the dial gauge and the slidable movable measuring pin are horizontal. The movable measuring pin is vertical with the left end surface of the positioning block. Furthermore the left end of the movable measuring pin extends into the acute-angle area, and the right end is connected with a lever which can rotate around a fixed shaft for transmitting the displacement of the movable measuring pin to the measuring head of the dial gauge. Below the movable measuring pin, two positioning pins are fixedly mounted at the left end of the positioning block. The end of each positioning pin is aligned with the end of the movable measuring pin. According to the device and the method, the pressure surface of a standard component or the tenon to be measured pushes the movable measuring pin to slide. Displacement is transmitted to the dial gauge through the lever. An angle difference of the pressure surface angle of the tenon relative to the standard component is obtained through direct measurement. The accurate value of the pressure surface angle is obtained through calculation, and convenient and accurate measurement is realized.

Description

【Technical field】 [0001] The invention belongs to the measurement technology of aero-engines, and in particular relates to a device and method for measuring the pressure surface angle of a tenon of a dovetail blade. 【Background technique】 [0002] Blades are a very important type of aero-engine parts and play a key role in the performance of the engine. The angle of the pressure surface is required to be 60°±4’, and its actual value needs to be tested. When testing the tenon of dovetail blades, there are generally two measurement methods. The first one is to detect a single element of the tenon, which includes the width of the dovetail node, the angle of the dovetail, and the straightness of the dovetail. This detection method directly measures the measured The actual value of the size; the second is to check the tenon comprehensive elements, which includes projection inspection, tenon comprehensive gauge inspection, etc., among which the projection inspection is to project...

AI Technical Summary

Problems solved by technology

When testing the tenon of dovetail blades, there are generally two measurement methods. The first one is to detect a single element of the tenon, which includes the width of the dovetail node, the angle of the dovetail, and the straightness of the dovetail. This detection method directly measures the measured The actual value of the size; the second is to check the tenon comprehensive elements, which includes projection inspection, tenon comprehensive gauge inspection, etc., among which the projection inspection is to project the two pressure surfaces, and the tenon comprehensive gauge is measured by two measures, one large and one small. The qualified tenon can be snapped in, so these testing methods can only judge whether the comprehensive size of the tenon is qualified, and cannot get the actual value

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