To improve precision machining technology for small bore size, we examined the effects of honing stone grain size on the honing process using ultrasonic vibration in the radial direction of the honing stone as in-feed motion. In the honing of hardened steel, the size generation corresponded to the increase in vibration amplitude. Therefore, the finished size could be controlled by adjusting the vibration amplitude. In addition, the grain size effects of the honing stone on the size generation process and the honed surface properties in ultrasonic vibration honing were explored, yielding basic information on rational honing stone selection criteria.

Surface roughening is a means of improving biocompatibility of orthopedic and/or dental implants. In this work, fine particle peeing was used to roughen the surface of titanium specimens. Regular ridges were formed by angled fine particle peening where shot particles were projected at an inclined angle and they acted as scaffolds for cell adhesion. The adhesion of the cells on the titanium surface in the early stage was promoted at the peaks of the ridge texture. The ridge structure seems to control the placement of cell adhesion.