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Method for converting normal tolerance into polar radius tolerance

A conversion method and pole radius technology, applied in the field of measurement, can solve the problems of high accuracy requirements of measurement equipment, low production efficiency of cam products, and inability to meet mass production requirements.

Active Publication Date: 2021-03-19
XIAN AERO ENGINE CONTROLS
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Problems solved by technology

This technology has high requirements on the accuracy of measuring equipment, and due to idle equipment, it needs to have stable temperature, humidity and other requirements. It is not suitable for production sites, resulting in low production efficiency of cam products and cannot meet the needs of mass production.

Method used

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  • Method for converting normal tolerance into polar radius tolerance

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Embodiment Construction

[0039] The invention provides a conversion method from a normal tolerance to a polar radius tolerance, and the conversion method from a normal tolerance to a polar radius tolerance comprises the following steps:

[0040] 1) Randomly select any point P on the center line of the digital measurement model of the part profile, and point P corresponds to the actual profile measurement point Q; the tolerance bandwidth of point P on the drawings is ±T; the tolerance bandwidth of point Q is ±T T2;

[0041] 2) The actual surface point Q is normal-biased by R1 to obtain the theoretical center point P, and the radius R corresponding to the theoretical center point P is the radius corresponding to the angle β required by the design;

[0042] 3) Use a three-coordinate measuring machine to compare and measure the corresponding coordinate system with the model to obtain the actual value T2 of the normal deviation of the actual profile measurement point Q, and at the same time obtain the posi...

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Abstract

The invention belongs to the field of measurement, and relates to a method for converting normal tolerance into polar radius tolerance. The method comprises the following steps of: 1) taking any pointP on a molded surface center line of a part model; 2) performing normal bias R1 on the actual molded surface point Q to obtain a theoretical central point P; 3) performing comparison measurement according to the corresponding coordinate system and the model to obtain a normal deviation actual value T2 of the actual profile measurement point Q, the position of the actual profile measurement pointQ and a normal direction vector actual value of the actual profile measurement point Q; calculating to obtain a normal direction angle alpha of an actual profile measurement point Q and a polar radiusR and an angle beta of a theoretical central point P; 4) the deviation T of the theoretical central point P in the radial direction is approximately equal to T1 / cos (theta) = T1 / cos (alpha-beta); and5) comparing and measuring to obtain corresponding data, and performing formula operation to obtain the radial deviation T of the central point. According to the invention, the measurement efficiencyof the cam profile can be improved, the machining waiting period is shortened, and the measurement cost is reduced.

Description

technical field [0001] The invention belongs to the field of measurement, and relates to a conversion method from a normal tolerance to a polar radius tolerance, in particular to a conversion method from a normal tolerance to a polar radius tolerance in the surface measurement of two-dimensional cam parts. Background technique [0002] The general two-dimensional cam profile measurement technology is mainly carried out by a high-precision three-coordinate measuring machine. The polar radius tolerance of the center track of the cam profile is measured with a specific roller radius during the measurement. This technology has high requirements on the accuracy of measuring equipment, and due to idle equipment, it needs to have stable temperature, humidity and other requirements. It is not suitable for production sites, resulting in low production efficiency of cam products and cannot meet the needs of mass production. Contents of the invention [0003] In order to solve the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/20
CPCG01B21/20
Inventor 刘碑刘猛戴彦辰李富强黑金龙李乃祥
Owner XIAN AERO ENGINE CONTROLS
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