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research-article

A Systemic Approach for On-line Minimizing Volume Difference of Multiple Chambers with Casting Surfaces in Machining Processes Based on High Definition Metrology

[+] Author and Article Information
De-Lin Huang

State Key Lab of Mechanical System and Vibration, Shanghai Jiaotong University, Shanghai, 200240, ChinaSchool of Mechanical Engineering, Shanghai Jiaotong University, Shanghai, 200240, China
cjwanan@sjtu.edu.cn

Shi-chang Du

State Key Lab of Mechanical System and Vibration, Shanghai Jiaotong University, Shanghai, 200240, ChinaSchool of Mechanical Engineering, Shanghai Jiaotong University, Shanghai, 200240, China
lovbin@sjtu.edu.cn

Gui-Long Li

School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai, 200240, China
lgllg68629315@qq.com

Zhuo-Qi Wu

School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai, 200240, China
zqwu@sjtu.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4035897 History: Received May 31, 2016; Revised January 26, 2017

Abstract

The chamber volumes are very important for some mechanical products. For instance, the volume variations of engine cylinder head combustion chambers directly affect the critical functions (e.g. compression ratio) of an engine. The interior surfaces of the chambers are usually not being machined after casting processes due to high machining cost. Traditional titration methods are only applied off line to evaluate the variations of the chamber volumes since they are considerably time-consuming. Therefore, it is difficult to on line control the volume variations of multiple chambers in machining processes. With the development of new high definition metrology (HDM) technologies, millions of coordinate points of the interior surfaces of the chambers can be on line obtained, and thus great opportunities are provided for on-line controlling volume variations of multiple chambers of a workpiece. However, there are some critical problems urgently need to be solved, such as datum transformation of high-density points, precise volume calculation of multiple chambers, and minimizing the volume difference of any two ones of all chambers. This paper presents a novel systemic approach for on-line minimizing the volume difference of multiple chambers of a workpiece based on HDM. A model for obtaining an optimized machining parameter for depth of chambers is explored to minimize the volume difference of any two ones of all chambers. The results of a case study show that the proposed approach can minimize the volume difference of four combustion chambers of a cylinder head in machining processes.

Copyright (c) 2017 by ASME
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