Papers by Author: Wei Gao

Abstract: In this paper, the fall off and wear of electroplated endless diamond wire saws were studied when cutting granite. The self-made electroplating diamond wire saw was adapted in the experiment. Diamond particle size used was 200-230 US mesh. A kind of granite named Shi Daohong 375-2 with 18mm thickness was sawed. The test piece was sawed with constant cutting speed and feeding pressure. The topographies of wear, breakage and fall off of diamond grains were observed by using scanning electron microscopy. It was showed by the research that the damage of diamond grains appeared three forms including polishing wear and partial breakage and whole breakage. The fall off of diamond grain could be divided into two kinds of partial fall off and whole fall off during the cutting process. At the beginning cutting period, the wear of diamond grain mainly was polishing wear and partial breakage and with the extension of cutting time, the diamond grains would take place whole breakage and fall off.

Abstract: The research and manufacture of endless diamond wire saws have been reported in this paper. The matrix of saws was 65Mn steel wire whose diameter was o.8mm, and was welded as a ring by argon arc welding. The endless diamond wire saws were made by setting diamond abrasives on endless steel matrixes using nickel-plating method. The cutting experiments were carried out using the diamond wire saws on the homemade test equipment. The characteristics of the saws are narrow slot, high cutting speed, low noises and good surface quality. The surface cut could be finishing grinding or polishing directly, so the productivity could be improved greatly. Endless diamond wire saws can cut not only rock, but also valuable hard and brittle materials such as ceramic, boulder, and silicon etc.

Abstract: The Ti-coated diamond and the uncoated diamond were brazed with Ni-based filler alloy by high-frequency induction under argon atmosphere at 1050°C within 15 seconds. The interfacial microstructures between brazed diamond and the filler alloy were analyzed by scanning electron microscopy (SEM), energy dispersion spectrometer (EDS) and X-ray diffraction (XRD). It is surprisedly found that Cr-carbides forms normally and compactly on the surface of Ti-coated diamond brazed, whereas Cr-carbide forms tangentially and loosely on the surface of uncoated diamond brazed. The abrade experiment results for the brazed diamonds show that the bond strength between the normally formed Cr-carbide and the diamond is higher than that between Cr-carbide and uncoated diamond brazed. Furthermore, the cause that Ti changes the morphology of Cr-carbides on the surface of Ti-coated diamond brazed is discussed by the further tests specially designed.