Three Dimensional Grinding Force Measurement in Mold Grinding Processes

• Main Authors: Chia-Yen Lin, 林嘉彥
• Other Authors: Chaohwa Liu
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/79040456950840753604

碩士 === 淡江大學 === 機械工程學系 === 87 === In this thesis, a strain gage dynamometer is designed and manufactured to measure three dimensional grinding forces during grinding processes. With a resolution of 0.0096Nt in all 3 directions, this dynamometer is able to measure 2 tangential grinding forces in the range 0.0096 to 200Nt, and the normal grinding force in the range 0.0096 to 250 Nt. The dynamometer is composed of 4 measuring blocks to which strain gages are attached. Measuring blocks are designed so that, upon application of forces, they deform in a way that forces in the x, y, and z directions can be separated with little interaction. These results were confirmed by finite element analyses. The dynamometer is then used to measure grinding forces of the grinding process, the motion which is produced by a hand grinder mounted on the spindle of a NC machine. Results are given for 3 commonly used materials for molds, 3 hand grinder speeds, 3 feed rates for the NC machine, 3 different grinding paths , and 3 diameters of grinding tool. Effects of these factors on grinding forces are investigated. By using the analysis of variance of the Taguchi method, influence of each on all grinding forces (i.e. 2 tangential forces in the x and y direction, the normal force in the z direction, and the resultant force) are obtained. It is found that grinding paths is the most influential factor on all grinding forces. All grinding forces decrease when grinding paths turn along smoother arcs. The second-most influential factor on grinding forces is workpiece material. All grinding forces increase with hardness of materials