CN-116202395-B - Design method of follow-up self-positioning blade chord length gauge

CN116202395BCN 116202395 BCN116202395 BCN 116202395BCN-116202395-B

Abstract

The invention provides a design method of a random self-positioning blade chord length gauge, which takes an X axis and a Y axis of a blade as original references, an included angle alpha between a measured axis of the blade and the X axis forms an L axis, a lower end measurement starting point of the measured dimension is arranged on a blade tail arc of the blade, A, B, C points are respectively selected on the blade and used as references to design the shape of a clamping plate, the A reference and the C reference are respectively positioned in a straight line, the B reference is positioned by a curve, the dimension measurement baseline of the blade is parallel to the reference axis of the measured dimension, the shape precision of the clamping plate is calculated, the dimensions and curve point coordinates of the A reference, the B reference and the C reference are obtained, the self-positioning of the clamping plate and the blade is realized by finding the corresponding positioning of the A reference, the B reference and the C reference on the clamping plate, and the quick and accurate measurement of the chord lengths of the blades with different shapes or the sizes can be realized on site in batch production, and the cost is low.

Inventors

YANG QING

Assignees

重庆三耐科技有限责任公司

Dates

Publication Date: 20260508
Application Date: 20230215

Claims (1)

1. A design method of a follow-up self-positioning blade chord length gauge is characterized by comprising the following steps: S1, the design references of the blade are an X axis and a Y axis, the X axis and the Y axis are taken as original references, an included angle alpha between a measuring axis of the chord length of the blade and the X axis forms an L axis, and a measuring starting point at the lower end of the chord length is arranged on a tangent point of a blade tail arc R0.25 of the blade; s2, respectively selecting A, B, C points on the blade as reference design clamping plates, wherein the A reference and the C reference are respectively positioned in a straight line, the B reference is positioned by a curve, the A reference is a tangent point of the boundary line of the clamping plates and the tail arc, the B reference is a section of curve selected at the A reference position which is close to the position tangent to the tail arc, and the C reference is a point tangent to the curve of the blade, so that the dimension measurement baseline of the clamping plates is parallel to the measurement axis of the chord length; S3, calculating the shape precision of the clamping plate, and acquiring point coordinates of the A reference and the C reference and curve point coordinates of the B reference; s4, positioning the clamping plate at the reference A by making a tangent straight line segment at the position, corresponding to the reference A, of the clamping plate, making a coupled short curve segment at the position, corresponding to the reference B, of the clamping plate, positioning the clamping plate at the reference B, making a straight line segment tangent to the blade profile at the position, corresponding to the clamping plate and the reference C, positioning the clamping plate at the reference C, realizing self-positioning of the clamping plate and the blade, and adopting the clamping plate to finish the dimension measurement of the chord length of the blade, wherein the clamping plate is designed into a through end clamping plate and an end stopping clamping plate, the clamping plate is close to the blade, no clearance exists at three points of the reference A, the reference B and the reference C, the through end passes, the stop end does not pass, and the chord length of the blade is qualified, otherwise, the clamping plate is unqualified.

Description

Design method of follow-up self-positioning blade chord length gauge Technical Field The invention relates to the technical field of blade chord length measurement, in particular to a design method of a follow-up self-positioning blade chord length gauge. Background The chord length measurement of the aero-engine blade is a measurement requirement frequently encountered in blade manufacture, and the chord length clamping plate is one of common tools in a quick and simple measurement method on a mass production site. The clamping plate is used with a special measuring tool, so that the measurement is accurate, the manufacturing cost is high, the use situation is inflexible, the clamping plate is used by hand, the manufacturing cost is low, the use is flexible, certain scenes are inapplicable, for example, when the measured dimension reference axis forms a certain included angle with the clamping plate reference axis, the clamping plate used by hand is difficult to accurately obtain the correct measurement result. Therefore, a blade chord length gauge method with low measurement cost and convenient measurement is lacking at present. Disclosure of Invention Aiming at the defects existing in the prior art, the invention provides a design method of a random self-positioning blade chord length gauge, which aims to solve the technical problems of high manufacturing cost or inflexible use scene in the prior art when the blade chord length is measured. The invention provides a design method of a follow-up self-positioning blade chord length gauge, which comprises the following steps: S1, taking an X axis and a Y axis of a blade as original references, wherein an included angle alpha between a measured axis of the blade and the X axis forms an L axis, and a lower end measurement starting point of the measured dimension is arranged on a blade tail arc of the blade; s2, respectively selecting A, B, C three points on the blade as the shape of a reference design clamping plate, wherein the A reference and the C reference are respectively positioned in a straight line, and the B reference is positioned by a curve, so that the dimension measurement baseline of the clamping plate is parallel to the reference axis of the measured dimension; S3, calculating the shape precision of the clamping plate, and obtaining the sizes and curve point coordinates of the A reference, the B reference and the C reference; S4, positioning the clamping plate at the reference A by making a tangent straight line segment at the position, corresponding to the reference A, of the clamping plate, making a coupled short curve segment at the position, corresponding to the reference B, of the clamping plate, positioning the clamping plate at the reference B, making a tangent straight line segment at the position, corresponding to the reference C, of the clamping plate, positioning the clamping plate at the reference C, realizing self-positioning of the clamping plate and the blade, and measuring the chord length of the blade by adopting the clamping plate. Optionally, the lower end measurement starting point of the measured dimension is set on a tail arc of the blade, including: The lower end measurement starting point of the measured size is arranged on the tangent point of the tail edge circular arc R0.25 of the blade. Optionally, the shape of A, B, C three points as reference design clamping plates is selected on the blade respectively, the reference a and the reference C are respectively positioned by two sections of straight lines, the reference B is positioned by a curve, and the method comprises the following steps: the reference A is a tangent point of the boundary line of the clamping plate and the tail arc, the reference B is a section of curve selected at the reference A near the position tangent to the tail arc, and the reference C is a point at which the parallel line of the L axis is tangent to the curve of the blade. Optionally, the obtaining the dimensions and curve point coordinates of the a-reference, the B-reference, and the C-reference includes: The length dimensions of the A datum, the B datum and the C datum are all selected to be 8-35 mm, and the position precision of the A datum, the B datum and the C datum is +/-0.01 mm. Optionally, the clamping plate is designed as a through end clamping plate and a stop end clamping plate. Compared with the prior art, the invention has the following beneficial effects: According to the invention, when the chord lengths of the blades with different shapes or sizes are produced in batch, the rapid and accurate measurement on site is realized by manufacturing the chord length clamping plates matched with the blades, and the manufacturing and maintenance cost is low. Drawings The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the