| Summary: | 碩士 === 淡江大學 === 機械工程學系 === 88 === Title of Thesis: Total Pages:67
Force Control in Grinding Processes
Key words: Grinding, Force Control, Surface Roughness,
Name of Institute: Graduate Institute of Mechanical Engineering,
Tamkang University
Graduate Date: July, 2000 Degree Conferred: Master
Name of Student: Chen Jun- Cheng Advisor: Liu, Chaohwa
陳 俊 成 劉 昭 華
Abstract:
In this thesis, a force control system is developed to improve grinding quality. The system includes a hand grinder mounted on a CNC machine center, a force sensor to measure normal grinding force, and a force control system to adjust grinding depth. The purpose of this system is to perform grinding force control to reduce surface roughness.
A grinding process model for the automatic grinding system using an electric hand grinder is developed in this thesis. A PID controller is designed to perform force control, which calculates the appropriate CNC spindle displacement according to the force measured by the force sensor. Computer simulation results show that the system settling time is less than 0.25 second. In the force control process, the expected values of spindle displacement goes to CNC control box through 8255-card and photo-couple interface. The vertical movement of the CNC spindle is produced by utilizing a function called “external machine zero point shift”.
Experiments performed in this thesis include Taguchi’s parametric design to determine an ideal combination of horizontal feed rate and desired force for control, and also grinding along an inclined surface. For the case of inclined surface grinding, results show that the force control technique may indeed reduce average grinding force and grinding force variation.
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