CN-117824488-B - Method for measuring upper end face and lower end face of rotary part based on combination of geometric quantity and roundness

CN117824488BCN 117824488 BCN117824488 BCN 117824488BCN-117824488-B

Abstract

The invention relates to the technical field of contact measurement, in particular to a method for measuring upper and lower end surfaces of a revolving body part based on combination of geometric quantity and roundness. The method comprises the steps of placing a measuring head on the upper end face of a standard ring, recording the numerical values of a height sensor and a measuring head inductance meter, placing the measuring head on the lower end face of the standard ring, recording the numerical values of the height sensor and the measuring head inductance meter, calculating the end face error of the standard ring according to the height difference and the measurement data of the upper end face and the lower end face of the standard ring, placing the measuring head on the upper end face of a revolving body part, recording the numerical values of the height sensor and the measuring head inductance meter, placing the measuring head on the lower end face of the revolving body part, recording the numerical values of the height sensor and the measuring head inductance meter, and calculating the distance between the upper end face and the lower end face of the revolving body part according to the end face error and the measurement data. The measuring method of the upper end face and the lower end face of the rotary part based on the combination of the geometric quantity and the roundness aims to solve the problem that the traditional contact measurement of the rotary part cannot simultaneously carry out precise measurement of the shape and the position errors and the geometric parameters.

Inventors

LIU YONG
Ai shibo
LI YANG
FANG JIANGUO

Assignees

中国航空工业集团公司北京航空精密机械研究所

Dates

Publication Date: 20260512
Application Date: 20231229

Claims (3)

1. The measuring method of the upper end face and the lower end face of the revolving body part based on the combination of the geometric quantity and the roundness is characterized by comprising the following steps: Fixing the pose of the measuring head, placing the measuring head on the upper end surface of the standard ring, and recording a first numerical value of the height sensor and a second numerical value of the measuring head inductance gauge; Maintaining the pose of a measuring head, placing the measuring head on the lower end surface of the standard ring, and recording a third numerical value of the height sensor and a fourth numerical value of the measuring head inductance gauge; Calculating the end face error of the standard ring according to the height difference between the upper end face and the lower end face of the standard ring, the first value, the second value, the third value and the fourth value, wherein the end face error of the standard ring has a calculation formula of e= (H TS +a TS )-(H BS -a BS ) -E, wherein E is the end face error of the standard ring, H TS is the first value, a TS is the second value, H BS is the third value, a BS is the fourth value, E is the height difference between the upper end face and the lower end face of the standard ring, and the height difference between the upper end face and the lower end face of the standard ring is a known value; Maintaining the pose of a measuring head, placing the measuring head on the upper end surface of a revolving body part, and recording a fifth numerical value of the height sensor and a sixth numerical value of the measuring head inductance gauge; maintaining the pose of a measuring head, placing the measuring head on the lower end surface of a revolving body part, and recording a seventh numerical value of the height sensor and an eighth numerical value of the measuring head inductance gauge; Calculating the distance between the upper end face and the lower end face of the revolving body part according to the end face error of the standard ring, the fifth value, the sixth value, the seventh value and the eighth value, wherein the calculation formula of the distance between the upper end face and the lower end face of the revolving body part is d= (H TM +a TM )-(H BM -a BM ) -e, d is the distance between the upper end face and the lower end face of the revolving body part, H TM is the fifth value, a TM is the sixth value, H BM is the seventh value, a BM is the eighth value, and e is the end face error of the standard ring.
2. The method for measuring the upper and lower end surfaces of a rotary part based on a combination of geometric quantity and roundness according to claim 1, wherein the gauge head inductance gauge is used for measuring roundness.
3. The method for measuring the upper and lower end surfaces of a rotary part based on a combination of geometric quantity and roundness according to claim 2, wherein the rotary part is carried by an air-floating rotary table for rotation, and the reading of a measuring head inductance gauge pressed onto the rotary part is read for roundness calculation.

Description

Method for measuring upper end face and lower end face of rotary part based on combination of geometric quantity and roundness Technical Field The invention relates to the technical field of contact measurement, in particular to a method for measuring upper and lower end surfaces of a revolving body part based on combination of geometric quantity and roundness. Background The existing contact type measurement technology of the rotary part is divided into two technical routes, one is a geometric quantity measurement method, wherein the most representative is a three-coordinate measuring machine, the geometric information of the part is obtained by collecting coordinate points of X, Y, Z three dimensions and fitting the shape of the measured workpiece, the other is a roundness measurement method, the most representative is a roundness measuring instrument, and the section data of the measured workpiece is evaluated under a polar coordinate system by collecting angle values and measured values of the surface of the rotary part. Both geometric measurement methods (e.g., methods using three-coordinate measuring machines) and roundness measurement methods have their own drawbacks when measuring parts of revolution. The three-coordinate measurement has poor effect on the shape parameters of a plurality of rotary sections related to roundness, such as roundness, runout, maximum value of runout, corresponding angle of maximum value of runout, minimum value of runout, corresponding angle of minimum value of runout and the like. The difficulty is that the three-coordinate measuring machine can hardly collect the jump value of the whole circle of the cross section completely, even if the jump value is collected, because of the working characteristic of the three-coordinate measuring machine, a reference circle needs to be defined firstly, then a plurality of points are selected on the circle for measurement, if 360 or more points are selected, the measurement time is very long, therefore, the traditional three-coordinate measuring machine is not suitable for measuring the accurate shape parameters related to the roundness of the circular cross section of the revolving body part in terms of precision and efficiency, and is not suitable for measuring the tip clearance of an engine. On the other hand, the roundness measuring instrument can collect the data of the complete section, so that the shape and position errors of the revolving body part, such as roundness, runout, maximum value of runout, corresponding angle of the maximum value of runout, minimum value of runout, corresponding angle of the minimum value of runout and the like, are calculated accurately, but the roundness measuring instrument does not have the calibratable geometric data, so that the geometric parameters of the revolving body part cannot be measured and calculated, and the roundness measuring instrument is not suitable for measuring the gap between the rotor and the stator blade of the engine. Therefore, the inventor provides a measuring method of the upper end face and the lower end face of the revolving body part based on the combination of the geometric quantity and the roundness. Disclosure of Invention (1) Technical problem to be solved The embodiment of the invention provides a measuring method for upper and lower end surfaces of a rotary part based on combination of geometric quantity and roundness, which solves the technical problem that the conventional contact measurement of the rotary part cannot simultaneously perform precise measurement of shape and position errors and geometric parameters. (2) Technical proposal The invention provides a measuring method of upper and lower end faces of a revolving body part based on combination of geometric quantity and roundness, which comprises the following steps: Fixing the pose of the measuring head, placing the measuring head on the upper end surface of the standard ring, and recording a first numerical value of the height sensor and a second numerical value of the measuring head inductance gauge; Maintaining the pose of a measuring head, placing the measuring head on the lower end surface of the standard ring, and recording a third numerical value of the height sensor and a fourth numerical value of the measuring head inductance gauge; Calculating an end face error of the standard ring according to the height difference between the upper end face and the lower end face of the standard ring, the first numerical value, the second numerical value, the third numerical value and the fourth numerical value; Maintaining the pose of a measuring head, placing the measuring head on the upper end surface of a revolving body part, and recording a fifth numerical value of the height sensor and a sixth numerical value of the measuring head inductance gauge; maintaining the pose of a measuring head, placing the measuring head on the lower end surface of a revolving body part, and recording a seventh numerical