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Method for machining concave spherical crowns or concave ball ring surfaces through multi-magnet distributed annular magneto-theological polishing tool

A magnetorheological polishing and multi-magnet technology, which is applied in the direction of manufacturing tools, metal processing equipment, grinding/polishing equipment, etc., can solve the problems of difficult processing, complicated equipment, and low precision, and achieve good processing stability and high processing efficiency. The effect of high efficiency and stable removal function

Active Publication Date: 2019-03-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to invent a circular arrangement of small permanent magnets with less pertinence for the problems of difficult processing, complex equipment and low precision of the existing concave spherical crown or concave spherical torus with a diameter of less than 100 mm. The relatively efficient magnetorheological polishing processing method of the caliber concave spherical crown (or concave spherical torus) can greatly improve the polishing processing efficiency, and can further improve the surface shape accuracy of the part while reducing the surface roughness of the workpiece. Correction effect

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  • Method for machining concave spherical crowns or concave ball ring surfaces through multi-magnet distributed annular magneto-theological polishing tool

Examples

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Effect test

Embodiment 1

[0027] Such as figure 1 shown.

[0028] A method for polishing a concave spherical surface (60 mm in diameter) of a hemispherical shell part (hemispherical resonator) with a central rod, which includes the following steps:

[0029] (1) According to the size of the part, prefabricate the flat equivalent polishing tool, and determine the main process parameters through experiments;

[0030] According to the size of the concave spherical surface of the spherical shell part, the plane polisher is manufactured to carry out process parameter experiments to determine the range of processing gap, polisher speed, and magnetic field strength parameters. The appropriate process parameters are: processing gap 0.6mm, polisher speed 350rpm, magnetic induction strong fit.

[0031] (2) Design the parameters of the permanent magnet and its cage, and assemble it into a ring magnetorheological polishing tool;

[0032] Based on the main process parameters obtained in step (1), the annular magn...

Embodiment 2

[0041] A method for concave spherical surface polishing (90 mm in diameter) of a dome cover part, which comprises the following steps:

[0042] (1) According to the size of the part, prefabricate the flat equivalent polishing tool, and determine the main process parameters through experiments;

[0043] According to the size of the concave spherical surface of the spherical cover part, the plane polisher is manufactured to carry out process parameter experiments to determine the range of processing gap, polisher speed, and magnetic field strength parameters. The appropriate process parameters are: processing gap 0.8mm, polisher speed 300rpm, magnetic induction strong fit.

[0044](2) Design the parameters of the permanent magnet and its cage, and assemble it into a ring magnetorheological polishing tool;

[0045] Based on the main process parameters obtained in step (1), the annular magnetorheological polishing tool is designed, and the d3h2mm cylindrical permanent magnet made...

Embodiment 3

[0054] The difference between this embodiment and the first embodiment is that the concave spherical crown is changed into a concave spherical torus, and other steps are the same as the embodiment.

[0055] The invention proposes a magnetorheological polishing method for a small multi-magnet arrangement annular magnetorheological polishing tool, which can perform magnetorheological polishing for parts of concave spherical crowns (or concave spherical torus) of different sizes, and has a wide range of applications , can adapt to complex parts to avoid interference. While polishing improves the surface roughness of the workpiece, it also has a certain degree of correction effect on the surface accuracy of the workpiece. The processing process has the characteristics of relatively high processing efficiency, good stability, simple and durable polishing tools, low processing cost, and convenient operation.

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Abstract

A method for machining small-bore concave spherical crown or concave ball ring surface parts through a multi-magnet distributed annular magneto-theological polishing tool is characterized in that according to the size of the parts, a plane equivalent polishing tool and a test are prefabricated to determine the main process parameters, and permanent magnets are designed according to the process parameters and the structural shape of the parts and assembled into the annular magneto-theological polishing tool. Track simulation is conducted through the Matlab software to determine the rotation speed series capable of achieving axial and circumferential even removal. The parts and the annular polishing tool are subjected to sphere center positioning mounting, and the inclination angle alpha ofthe part axis and the tool axis is adjusted. According to the main process parameter values, a machine tool workpiece shaft and a tool shaft are started, and magneto-theological polishing liquid is continuously supplied to the machining area to conduct polishing machining on the concave spherical crown (concave ball ring surface) parts. The method can make the surface roughness achieve the nanoscale super-smooth surface, and achieves a better correction function for the surface figure accuracy (sphericity) of the parts.

Description

technical field [0001] The invention relates to a spherical surface processing method, especially a polishing processing method for a concave spherical crown or a concave spherical torus with a diameter of less than 100 mm. Specifically, when processing a multi-magnet arrangement annular magnetorheological polishing tool, there Interferometric concave spherical crown (or concave spherical torus) part polishing method. Background technique [0002] In the fields of aerospace, optical processing and special equipment, hard and brittle materials such as sapphire and fused silica are widely used in the manufacture of various core components due to their good physical and chemical properties. Due to the need to realize the use requirements, many of the components have a small-diameter concave spherical crown (or concave spherical torus) structure of a specific size. And in most cases, there are high requirements for the shape accuracy and surface quality of parts. Therefore, po...

Claims

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Application Information

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IPC IPC(8): B24B1/00B24B57/02
CPCB24B1/00B24B1/005B24B57/02
Inventor 朱永伟汪忠喜牛凤丽张嘉倩沈功明陈佳鹏李军左敦稳
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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