スナッギング研削に関する基礎的研究

抄録

Today, the steel snagging costs have continuously increased and, thus, more intensive research is necessary to find better working conditions and to increase productivity. The 25% zirconia-alumina grain has attracted much attention for snagging industry as an excellent abrasive grain type, but the detail of grinding characteristic of the grain is still not understood. In the present research, a laboratory snagging test of constant pressure has been performed on S 55 C and SK 3 steels, using four regular alumina and zirconia-alumina grain types. The test was made under the loads to 30 kg and at a wheel speed of 3 200 m/min. The metal removal, as well as the wheel wear, increases at a constant speed with grinding time, and the wheel surface was found to have a constant slope. The 25% zirconia grain wheel does not always give higher metal removal rate over the regular alumina grain wheel, but this wheel has the higher G-ratio than the regular alumina wheel because of its lower wheel wear. One of the reasons for the low wheel wear in the zirconia grain wheel is considered to be due to high resistance of the zirconia grain to micro-fracture.