The Effect of Matrix and Processed Material Properties on the Performance of Diamond Drills
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POWDER METALLURGY INDUSTRY AND MANAGERIAL ECONOMICS THE EFFECT OF MATRIX AND PROCESSED MATERIAL PROPERTIES ON THE PERFORMANCE OF DIAMOND DRILLS V.P. Umansky,1,2 N.P. Brodnikovskiy,1 O.A. Bashchenko,1 and Ye.A. Rokitskaya1 UDC 620.178.1 The results of laboratory tests for drilling of corundum, chamotte, and porcelain with diamond tubular drills in running water, as well as the friction of cylindrical samples of the matrix against these materials, have been described. Bronze containing ultrafine ASM 1/0 diamond powders and molybdenum, as well as bronze without this reinforcement, served as the matrix for the drills and cylindrical samples. The speed of processing 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.% of ASM 1/0 concentration (depending on the choice of the test material). The wear of diamond powder increased insignificantly when the concentration of diamond powders grew to 11 wt.%. Similar results were obtained for the matrix of samples. Thus, the wear of the matrix samples decreased with an increase in the ASM 1/0 concentration. Such a decrease was observed even at 11 wt.% for friction against corundum. During 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. High 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 performed allowed concluding 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.% of 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 production. Keywords: diamond drills, matrix samples, drilling tests, friction tests, drilling speed, wear.
1Frantsevich
Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kyiv,
Ukraine. 2To
whom correspondence should be addressed; e-mail: [email protected].
Translated from Poroshkova Metallurgiya, Vol. 59, Nos. 7–8 (534), pp. 152–160, 2020. Original article submitted October 22, 2019. 1068-1302/20/0708-0477 2020 Springer Science+Business Media, LLC
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INTRODUCTION At manufacturing of the effective diamond tools (grinding stones, dressers, tubular drills, drilling bits, etc.) based on the diamond powders it is important to securely fix the grains of operating diamonds in a matrix [1–6]. The matrix provides the necessary shape of diamond tools, diamond concentration and distribution, as well as
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