Chapter 11 Variants of high speed machining
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| 298 High speed machining also suitable for HSM. The use of HSM in these molds is economical, as all processes of the production of the molds are carried out in one operation. Traditionally, the metal coolant or lubricant is utilized in order to decrease the tool’s wear rate in the final processing of the HSM process, which improves the surface quality. In the study by Chan and Xu [38] , a comparison of the impacts of dry, flood, and minimum quantity lubrication of hardened steel mold inserts on surface roughness, dimensional accuracy, tool wear, and machining time was performed. When the outcomes were evaluated, no significant difference was determined between the three lubrication technologies in question. More detailed experimental research for dry and minimum quantity lubrication was conducted by utilizing an experimental technique design. Surface roughness and tool wear did not differ in a significant way. However, the minimum amount of the lubrication process yielded more accurate results concerning dimensional deviations than dry parts. The regression models demonstrate that the feed rate influences the surface roughness and the processing time more significantly compared to the step-over having no considerable impact on the surface roughness of the cutting depth. According to the shape of the test piece, the minimum machining time of 3.55 sand a good surface finish of 0.28 mm, a small feed rate (0.03 mm/tooth), a significant step (0.1 mm, and a considerable cutting depth (0.2 mm) were obtained. The present study demonstrates that the minimum mold lubrication technique and the correct cutting conditions are combined in new mold and mold production while it is possible to record processing time and polishing time, which in turn results in a general saving in the costs of production. The usage of dry and minimum quantity lubrication methods for various finishing machining conditions may, thus, represent an excellent economical solution. It is possible to process graphite productively using Ti (C, Nor diamond coated solid carbide end mills. Mold modeling and prototyping are among the earliest areas for HSM. Materials that are easy to use, for example, nonferrous like aluminum, are utilized. Cutting speeds usually reach 15,000–50,000 rpm, and the feeds are very high. Download 0.88 Mb. Share with your friends:
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