Ryohei Ishimaru

A Fundamental Study on the Improvement for Chipping Characteristics in Gear Hobbing with Carbide Tipped Hob

In gear hobbing, it is important that improving productivity for gear manufacturing is increased by using carbide tipped hob with heatproof. However, damage might occur in the tool at the early stage when the cutting condition is mistaken, and the tool life be shortened extremely. Therefore, when carbide tipped hob is applied for gear cutting, it is important to understand the characteristic of it enough, and to understand the condition for the tool life. In this study, the factor of the damage of the carbide tool is systematically examined. The chipping factor of the carbide tool, i.e. carbide material, cutting velocity, feed, grinding condition for tool face, is investigated by using modified machining center and fly tool.

Application of mems technique for micro gear metrology

We try to measure direct transmission of rotational motion between a gear pair, which is called transmission error, without knowing the tooth flank accuracy of each gear. In transmission error measurement, the rotational angle of the shaft of each gear is measured with a pair of rotary encoders. For micro gear engagement, the center distance between a pair of gears is very small, so the rotary encoders have to be small as well as micro gears. A grating disk with a small diameter for a micro rotary encoder must be designed and manufactured. In machining process, one of the MEMS technique is applied. Patterning accuracy is examined in detail.