Papers by Keyword: Electroplated Diamond Tool

Abstract: Electroplating experiments were carried out using a conventional Watts bath with the application of ultrasonic in order to improve the coating quality. The effects of ultrasonic power on coating comprehensive characteristics were studied. The microstructure, hardness and thickness of the coatings were observed and determined by a HXD-100TMC type microhardness tester. The coating corrosion resistance was examined through soaking in 36% hydrochloric acid. The adhesive strength of the coatings was tested with the method of heat-shock. The results showed that the properties of the coatings are improved basically with the increase of ultrasonic power. It’s considered the coatings have the best comprehensive performances when ultrasonic power is 200W, which provides a basis for the subsequent fabrication of ultrasonic electroplated diamond tools.

Abstract: Hard and brittle materials such as ceramics and glass are not only difficult-to-machine but also occur easily cracks at the exit surface in through-hole drilling. This paper deals with through-hole drilling of glass plate for plasma display panel using an electroplated abrasive grain tool in order to find out drilling conditions for smaller cracks, higher drilling efficiency and longer tool life. In particular, the influence of the crack in two kinds of abrasive grain is examined. The main conclusions obtained in this study are as follows. The crack in diamond grain tool is smaller than that in CBN grain tool. Moreover, the tool life of diamond grain tool is longer than that of CBN grain tool. Adhered volume of chip increases with drilling numbers, so the crack size and the thrust force increases. The washing of tool is required in order to restrain crack and force.

Abstract: Single crystalline diamond grains covered by nested carbon nanotubes (CNTs) were constructed using self-assembly techniques. The acid-treated CNTs (MWCNTs-COOH) are first adsorbed onto amine-terminated diamond grains, which were chemically functionalized by silane coupling treatments, in N, N-dimethylformamide solution. Then, the drying and readsorption cycle deposited CNT coatings on the diamond grains due to CNT-CNT interactions caused by van der Waals forces. When the diamond grains were bonded to steel substrates by electroplating using nickel sulfamate plating bath, the bonding strength of the CNT-coated diamond grains to the Ni matrix was almost twice as large as that of the normal diamond grains. Hence, the CNT-coated diamond grains are very useful for improving the tool life of electroplated diamond tools.