Method for machining stepped hole with large depth-diameter ratio

Abstract

The invention discloses a method for machining a stepped hole with a large depth-diameter ratio. The method comprises the following steps: 1, measuring the aperture of n equidistant sections of a machined hole section and the corresponding Z-direction coordinates; 2, calculating the minimum machining allowance delta 1 and the maximum machining allowance delta 2; 3, judging whether the section aperture is within the dimensional tolerance or not; 4, judging the shape of an inner hole; 5, determining the movement track of a grinding wheel according to the shape of the inner hole; 6, carrying outreciprocating grinding m circles through the grinding wheel along the movement track; 7, measuring the aperture at the n equidistant sections of the machined hole section and the corresponding Z-direction coordinates, and calculating the minimum machining allowance delta 1 and the maximum machining allowance delta 2; 8, judging whether EI-ES,delta 1<=0 and 0<=delta 2<=ES-EI are met or not, if yes,carrying out the step 9, and if not, carrying out the step 3; and 9, completing the machining. According to the finishing machining method, measurement and finishing integrated machining is adopted,precise finishing machining of inner holes of three typical parts can be achieved, the shape precision of inner holes is guaranteed, the trimming time of inner holes is shortened, and the production efficiency and the consistency of part are improved.

Description

technical field [0001] The invention belongs to the field of inner circle precision grinding, in particular to a method for machining a stepped hole with a large depth-to-diameter ratio. Background technique [0002] Thin-walled cylindrical parts with large depth-to-diameter ratio are widely used in aerospace, military, lifting equipment and other fields. As the key hydraulic moving parts of aircraft landing gear, the actuator's machining accuracy and quality determine the Use performance and security. [0003] In order to meet the flight requirements of modern aircraft with high performance, high safety and high reliability, higher requirements are put forward for the processing accuracy of thin-walled actuators with large depth-to-diameter ratio (aperture ≤ 100mm, depth-to-diameter ratio ≥ 12). To ensure the strength of parts, such parts are usually forged with high-strength steel, and then a large amount of material removal (more than 87% of material removal) is used to ...

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Problems solved by technology

[0006] In order to solve the above problems, the present invention proposes a large depth-to-diameter ratio step hole processing method, which solves the problem of waist drum shape, saddle shape and taper error caused by uneven material removal during the grinding process of the large depth-to-diameter ratio step hole. Problem, to ensure the dimensional accuracy and cylindricity of part processing, shorten the part trimming time, improve the production efficiency and consistency of parts, the technical means adopted in the present invention are as follows:

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