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페룰 가공용 무심연삭기의 로터리 드레싱 시스템에 관한 연구
이은상(Eun-Sang Lee),조창래(Chang-Rae Cho) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
This paper has been studied the new dressing system of centerless grinder. Experiments of rotary diamond dressing of vitreous bond grinding wheel were conducted to investigate the effects of dressing on centerless grinding of zirconia ceramics. The application of ceramics components with precise and complex form and the lack of technology for precision dressing of diamond grinding wheels have driven the need to study the rotary diamond dressing system. This research is carried out for the purpose of saving the dressing time and improving the dressing efficiency.
조순주(Soon-Joo Cho),김형길(Hyung-Gil Kim),조창래(Chang-Rae Cho),BIHARA,TUSKISIMA 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
In this study, the ultra precision centerless grinder for ferrule grinding was designed. The centerless grinder is composed of the high damping concrete bed, grinding wheel spindle unit, regulating wheel spindle unit, feeding table and dressing unit. For a newly developed centerless grinder, hydrostatic system with high precision feeding and high stiffness was proposed. The grinding and regulating wheel spindle units were composed of hydrostatic spindle and feeding table was hydrostatic table. The prototype of hydrostatic table was manufactured and tested.
박천홍(Chun-hong Park),황주호(Jooho Hwang),조순주(Soon-Joo Cho),조창래(Chang-Rae Cho) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Design and performance evaluation of a spindle system which was composed of a grinding spindle and a regulating spindle for the centerless grinding of ferrule was performed in this paper. Layout and details of spindle system was designed and hydrostatic bearings for spindles were also designed. Prototype of spindle system was developed and its availabilities to machine the ferrule were discussed using the experimental results on the spindle stiffness of each spindle, loop stiffness, rotational accuracy and thermal characteristics. Loop stiffness of the spindle system was 130 N/㎛, which was enough to machine the ferrule. Rotational accuracies of each spindle were about 0.2 ㎛ at the primary speed of 2,300 rpm(grinding spindle) and 300 rpm(regulating spindle). Temperature rises at the same speed were about 4.4 ~ 4.7 ℃ in the case of grinding spindle and 1.8 ℃ in the case of regulating spindle, which were well agreed with the designed value. From these results, it was estimated that the prototype of spindle system had a enough performances for the centerless grinding machine to machine the ferrule.