Study on Control of Laser Profile Scanning for Fabricating Ceramic Parts with Rapid Prototyping Technology

• Main Authors: Shih-Hua Lu, 盧世華
• Other Authors: 嚴孝全
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/wjz6s6

碩士 === 國立臺北科技大學 === 機電整合研究所 === 98 === The self-development rapid prototyping equipment is composed of an X-Y mechanism and a CO2 laser. The segment of the scanning line was not connected each other when linear interpolation mode was employed; therefore, the scanning results were incorrect. The aim of current study is to improve this problem by using continuous interpolation mode. A four-axis motions card MC8141P with Borland C++ Builder was employed to edit human-Machine Interface program (HMI) for controlling. After input the coordinates of the point to the four-axis motion card, it will transfer to a pulse output signal; the signal transmitted to a AC servo motor driver to drive servo motor, then the X-Y mechanism was moved and positioned accordingly. The number of contour paths, starting point of the contour, ending point and the program of the executing sequence for contouring path interpolation was edited by HMI. After adjusting the gain of AC servo motor drives, the scanning graphics was more accurate. Major parameters of gain adjustment include mechanical stiffness values, speed proportional gain KVP, constant of speed integral time TVI and position proportional gain KPP. Communication software (Panaterm) for the Panasonic servo motor control was used to obtain the Bode plot as reference to adjust the cutoff frequency. After testing on a piece of paper, obviously, each line segment of the contour scanning with continuous interpolation mode can interconnect with each other. By adjusting the gain value of the dual-axis AC servo motor driver, a more accurate contour can be obtained. The results verify that using continuous interpolation mode and appropriate gain value for AC servo motor can improve the laser scanning problems aforementioned.