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Small-diameter permanent-magnetic spherical polishing head with uniform distribution of magnetic field and design method for optimizing structural parameters of same

A technology of magnetic field distribution and structural parameters, applied in grinding/polishing equipment, surface polishing machine tools, calculations, etc., can solve the problem of magnetorheological fluid adsorption thickness and inconsistent strength, affecting workpiece shape accuracy and processing surface quality, polishing head Non-uniform magnetic field distribution and other problems, to achieve the effect of easy popularization and application, improved material removal rate, and simple structure

Active Publication Date: 2013-02-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the existing small-diameter permanent magnet spherical polishing head, because its magnetization direction is fixed, the magnetic field distribution on the polishing head is uneven, and the magnetorheological fluid adsorption thickness and strength of different parts are inconsistent, thus affecting the shape of the workpiece Problems of precision and machined surface quality

Method used

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  • Small-diameter permanent-magnetic spherical polishing head with uniform distribution of magnetic field and design method for optimizing structural parameters of same
  • Small-diameter permanent-magnetic spherical polishing head with uniform distribution of magnetic field and design method for optimizing structural parameters of same
  • Small-diameter permanent-magnetic spherical polishing head with uniform distribution of magnetic field and design method for optimizing structural parameters of same

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specific Embodiment approach 1

[0037] Specific embodiment one: the small-diameter permanent magnet spherical polishing head of the uniform magnetic field distribution described in this embodiment is a symmetrical structure, and described spherical polishing head is made up of ball head 1 and club 2, and described club 2 is that diameter is DD is a cylinder, the end center of the club 2 has an assembly hole with a diameter of D, and the depth of the assembly hole is H, and the head end of the club 2 is fixed with a ball head 1, and the ball head 1 has a radius R part of the sphere, and the center of the ball head 1 is located on the axis of the club 2, and the distance between the center of the ball head 1 and the end of the club 2 is HH. An annular groove 3 is arranged on the outer surface of the shaft, the width of the annular groove 3 is A, the depth is B, and the distance between the annular groove 3 and the end of the club 2 is L.

[0038] The permanent magnet polishing head described in this embodiment...

specific Embodiment approach 2

[0039] Embodiment 2: This embodiment is a further limitation of the small-diameter permanent magnet spherical polishing head with uniform magnetic field distribution described in Embodiment 1. In this embodiment, the radius R of the ball head 1 is equal to the club 2 half of the diameter DD.

[0040] The permanent magnet spherical polishing head described in this embodiment is based on the existing polishing head structure, and an annular groove is added. This kind of structure is more convenient to manufacture, and it is easy to achieve higher precision, and the magnetic field is evenly distributed. It is suitable for magnetic field Preparation of polishing heads with low strength requirements and small processing surfaces, suitable for most polishing head manufacturing situations.

specific Embodiment approach 3

[0041]Embodiment 3: This embodiment is a further limitation of the small-diameter permanent magnet spherical polishing head with uniform magnetic field distribution described in Embodiment 2. In this embodiment, the annular groove 3 is along the length direction of the club 2 The width A of the groove 3 is greater than 1.5 mm and less than or equal to 2 mm, the depth B of the groove 3 is greater than 0 mm and less than or equal to 0.3 mm, and the distance L between the annular groove 3 and the end of the club 2 is greater than 1.5 mm and less than or equal to 1.8 mm. mm, the diameter D of the assembly hole is greater than 2.0mm and less than or equal to 2.5mm, the depth H of the assembly hole is greater than 2.5mm and less than or equal to 4mm, and the radius of the ball head 1 is 1.8mm.

[0042] This embodiment is a further limitation on the structural parameters of the permanent magnet spherical polishing head described in the second embodiment. Next, the simulation method i...

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Abstract

The invention relates to a small-diameter permanent-magnetic spherical polishing head with uniform distribution of a magnetic field and a design method for optimizing structural parameters of the same, which relates to a polishing head and a structural parameter optimizing method thereof, and solves the problem of the traditional small-diameter permanent-magnetic spherical polishing head that the magnetic field is nonuniform to distribute and adsorption thickness and strength of magnetorheological fluid are inconsistent. The polishing head is of a symmetric structure and consists of a ball head and a cylindrical ball rod, wherein the center on the tail end of the ball rod is provided with an assembling hole, the front end of the ball rod is fixedly provided with the ball head, the ball head is one part of a ball body, and the outer surface of the junction between the ball rod and the ball head is provided with an annular groove. The optimizing method is characterized in that finite element analysis is conducted by adopting simulation software to simulate according to a three-dimensional simulation model of the polishing head and a working environment when the polishing head is used for polishing to obtain a distribution uniformity error of magnetic intensity surrounding the polishing head, and the optimization is completed when the error is smaller than 5 percent. The polishing head is applicable to the magneto-rheological machining of small curvature radius and specially-shaped surfaces.

Description

technical field [0001] The invention relates to a structural parameter optimization design method of a small-diameter permanent magnet spherical polishing head, and belongs to the technical field of permanent magnet spherical polishing head design and manufacture. Background technique [0002] With the increasing development of modern science and technology, various high-precision and high-surface-quality optical parts are required in the fields of national defense, aerospace, electronics, and biomedicine. The surface roughness Ra of these high-precision parts is mostly required to reach the nanometer level At present, ultra-precision cutting, ultra-precision grinding and magnetorheological polishing are mainly used to realize its processing. For some optical parts with relatively simple shape and large scale, magnetorheological polishing is often used to realize their processing. The basic principle of magnetorheological polishing is: under the action of an external magnet...

Claims

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Application Information

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IPC IPC(8): B24B31/14G06F17/50
Inventor 陈明君左泽轩刘赫男方针苏银蕊余波彭慧
Owner HARBIN INST OF TECH
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