THE EFFECT FROM THE PROPERTIES OF BINDER AND PROCESS MATERIAL ON THE PERFORMANCE OF DIAMOND DRILLS

    

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Omeliana Pritsaka str.,3, Kyiv, 03142, Ukraine
umanskyvp@gmail.com
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2020, #07/08
http://www.materials.kiev.ua/article/3114

Abstract

The laboratory tests for drilling of corundum, chamotte, and porcelain with diamond tubular drills in running water and rubbing of these materials against cylindrical samples made of studied tools are described. Bronze containing ultrafine ASM 1/0 diamond powders and molybdenum and bronze without this reinforcement served as the matrix for the drills and cylindrical samples. The speed of drilling corundum, chamotte, and porcelain with diamond drills constantly increased when the concentration of diamond powders raised to 11 wt.%. At the same time, the tool wear significantly reduced, reaching the minimum at 5−9 wt.% ASM 1/0 (depending on the choice of the test material). The wear of diamond powder somewhat increased when the concentration of diamond powders raised to 11 wt.%. Similar results were obtained for the matrix samples. The wear of the matrix samples decreased with an increase in the ASM 1/0 concentration. This decrease was observed even at 11 wt.% for friction against corundum. In friction against chamotte and porcelain, the wear of the samples reached the minimum at 7 wt.% diamond powders. As in the case with drills, a further increase in the content of ASM 1/0 in the reinforcement led to an increase in wear of the samples. The increase in wear of the drills and samples at a relatively high content (11 wt.%) of ultrafine diamond powders was explained by the porosity that occurred in the matrix. The studies led to the conclusion that reinforcement containing ultrafine ASM 1/0 diamond and molybdenum powders should be introduced into the matrix of diamond drills (to improve their performance and decrease the consumption of abrasive material). The matrix samples containing up to 7 wt.% ultrafine diamond powders can be successfully used as an abrasive tool for finishing (polishing) a series of nonmetallic materials, in particular, semiprecious and precious stones in jewelry making.


DIAMOND DRILLS, BORING SPEED, DRILLING TESTS, FRICTION TESTS, STANDARDS OF COPULA, WEAR