Title: Cutting force and wear behaviour of a brazed diamond trepanning bit when drilling granite

Authors: Baojun Sun; Chengjie Jiang; Fule Zong

Addresses: College of Aeronautics Engineering, Taizhou University, No. 1139, Shifu Road, Jiaojiang District, 318000, Taizhou, Zhejiang, China ' College of Aeronautics Engineering, Taizhou University, No. 1139, Shifu Road, Jiaojiang District, 318000, Taizhou, Zhejiang, China ' College of Aeronautics Engineering, Taizhou University, No. 1139, Shifu Road, Jiaojiang District, 318000, Taizhou, Zhejiang, China

Abstract: A brazed diamond trepanning bit was developed and used to drill granite. Assessment of the cutting performance of the bit included studying the cutting forces, torque, wear behaviour of abrasive grains, and service life. These results are compared to the results obtained with the electroplated diamond bit. It was found that the drilling force of the bit is related to the cutting thickness of a single abrasive particle and to the number of abrasive particles arranged on the end face of the bit. For the same size, abrasive arrangement, and cutting parameters, the drilling force decreases with an increase in the spindle speed and increases with an increase in the feed rate. Also, the service life of the brazed bit is larger than that of the electroplated bit. The failure form of the brazed bit is mechanical wear, whereas the failure form of the electroplated bit is abrasive shedding.

Keywords: diamond trepanning bit; cutting force; torque; wear behaviour; service life.

DOI: 10.1504/IJAT.2021.120287

International Journal of Abrasive Technology, 2021 Vol.10 No.4, pp.283 - 297

Received: 11 Mar 2021
Accepted: 21 Jul 2021
Published online: 13 Jan 2022 *

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