Relation between applied forces and surface characteristics on surface rolling in cast iron

주철의 표면로울링에서 가압력의 영향

Surface rolling is one of the plastic deformation processes, which improves surface roughness and increases hardness. The surface rolling tool used in this experiment was specially designed by author for surface rolling on cast iron. The cutting feeds were 0.10mm/rev.and 0.30mm/rev.The applied forces of rolling were in the range of 10kgf to 30kgf with 5kgf differences. The results obtained are as follows. (1) In general the good surface roughness can be obtained with the applied force 25kgf according to surface roughness of the previous turning. (2) The hardness is mainly increased at the first rolling process and is more increased with the increasing applied forces. (3) The reduction of the diameter heavily depends on the original surface roughness. That is, the larger surface roughness is, the larger is the reduction is the reduction of diameter.

본 연구에서는 대구중공업(주)의 대형선반 베드면 재질과 동일한 회수철(KS D4301 GC30)시편을 선삭가공하고 볼베어링의 레이스를 이용한 구조로 설계된 볼형 표 면로울링기구를 사용하여 로울러 다듬질을 행함으로서 전가공에 따른 가압력이 표면조 도에 미치는 영향을 구명하는데 목적을 두었으며 아울러 로울링 회수에 따른 표면조도, 경도 및 직경의 변화량을 실험적으로 구명하였다.