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Research Papers

Influence of Lapping Residual Stress on Machining Precision of Elastic Deformation Molding Method

[+] Author and Article Information
Julong Yuan

National Engineering Research Center
for High Efficiency Grinding,
Hunan University,
Changsha 410082, China
Key Laboratory of Special Purpose
Equipment and Advanced Processing
Technology of Ministry of Education,
Zhejiang University of Technology,
Hangzhou 310014, China
e-mail: jlyuan@zjut.edu.cn

Zhe Wu

National Engineering Research Center
for High Efficiency Grinding,
Hunan University,
Changsha 410082, China
e-mail: wanlingren@163.com

Ping Zhao

e-mail: zhaoping@zjut.edu.cn

Binghai Lv

e-mail: icewater7812@126.com

Wangpiao Lin

e-mail: 511430783@qq.com
Key Laboratory of Special Purpose
Equipment and Advanced Processing
Technology of Ministry of Education,
Zhejiang University of Technology,
Hangzhou 310014, China

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MICRO- AND NANO-MANUFACTURING. Manuscript received June 2, 2013; final manuscript received November 5, 2013; published online November 28, 2013. Assoc. Editor: Hitoshi Ohmori.

J. Micro Nano-Manuf 1(4), 041006 (Nov 28, 2013) (6 pages) Paper No: JMNM-13-1042; doi: 10.1115/1.4025979 History: Received June 02, 2013; Revised November 05, 2013

Elastic deformation molding method is a newly developed aspheric machining technology which can convert complex aspherical surface machining to simple flat surface machining. The residual stress induced in lapping process of elastic deformation molding method has significant influence on machining precision. In this paper, the influence of residual stress induced lapping process on machining accuracy is analyzed and discussed through experiment. An experiment with elimination of residual stress is carried out. The machining result shows that distortion amount has reduced form 2 μm to 0.8 μm, which means the residual stress can be effectively eliminated. A machining form accuracy of P-V 0.56 μm is obtained.

Copyright © 2013 by ASME
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References

Figures

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Fig. 1

Principle of elastic deformation molding method

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Fig. 2

Machining system of elastic deformation

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Fig. 3

Structure of vacuum absorption holder

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Fig. 4

(a) final machined mold and holder (b) form error of the mold comparing with the designed paraboloid

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Fig. 5

Lapping experiment setup

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Fig. 6

Profile of attach side before and after lapping

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Fig. 7

Distortion amount and the fitted sphere

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Fig. 8

Generation of residual stress in indentation of brittle materials

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Fig. 9

Relationship between material removal depth and maximum clearance

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Fig. 10

Motion relation of single-side planar lapping

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Fig. 11

Sampling points are set on the machined surface of workpiece

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Fig. 12

Relative height of machined surface with different lapping time

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Fig. 13

Varying MRR with lapping time

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Fig. 14

Polishing process of residual stress elimination

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Fig. 15

Distortion amount after polishing

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Fig. 16

Form accuracy of machined workpiece

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Fig. 17

The finished workpiece

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