Bài viết tiến hành nghiên cứu chế tạo lớp mạ composite Ni-cBN trên nền phẳng là cơ sở để chế tạo thanh đá và đĩa mài cBN bằng phương pháp mạ điện. Quá trình mạ composite được thực hiện với dung dịch Watts có pha hạt mài cBN với nồng độ 160g/l, nhiệt độ dung dịch duy trì trong quá trình mạ điện là 55 ᴏC, mật độ dòng nghiên cứu từ 1-10 A/dm2 và thời gian mạ composite từ 1-10 phút. | Transport and Communications Science Journal Vol 71 Issue 8 10 2020 935-943 Transport and Communications Science Journal RESEARCH ON FABRICATION ELECTROPLATING COMPOSITE Ni-CBN LAYER IN FLAT SURFACE FOR ELECTROPLATING CBN GRINDING STIKS AND DISCS Tran Thi Van Nga1 Truong Hoanh Son2 Tran Vinh Hung3 1 Faculty of Mechanical Engineering University of Transport and Communications No 3 Cau Giay Street Hanoi Vietnam 2 School of Mechanical Engineering Hanoi University of Science and Technology No 1 Dai Co Viet Hanoi Vietnam 3 Faculty of Mechanical Engineering and Mechatronics Phenikaa University Yen Nghia Ward Ha Dong District Hanoi Vietnam ARTICLE INFO TYPE Research Article Received 30 9 2020 Revised 22 10 2020 Accepted 26 10 2020 Published online 28 10 2020 https Corresponding author Email ngattv@ Abstract. This paper proposes an experimental research on the fabrication of Ni-cBN composite electroplating layer in a flat surface which is the foundation for fabricating cBN grinding stick and disc by the electroplating method. The Watts solution with 160 g l of cBN grit at temperature 55 ᴏC the current density from 1 to 10 A dm2 and the plating time from 1 to 10 minutes were used in the composite plating process. As a result the Ni-cBN composite electroplating layers in a flat surface observed by SEM showed that the quality of plating layer was good and grinding particles were evenly distributed. The cBN grinding particles were only partially buried and protruded from the surface to perform the cutting function. The density of cBN grits was defined by counting particles in the SEM photo. Based on experiments a regrestion equation of the density which depends on current density and plating time was determined. Keywords composite plating cBN grinding stick cBN grinding disc electroplating method flat surface 2020 University of Transport and Communications 935 Tạp chí Khoa học Giao thông vận tải Tập 71 Số 8 10
