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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.
오정수(Jung Soo Oh),조창래(Chang Rae Cho),쯔끼시마 히데히로(Tsukishima Hidehiro),조순주(Soon Joo Cho),박천홍(Chung Hong Park),오정석(Jeong Seok Oh),황인범(In Bum Whang),이원재(Won Jae Lee),김석일(Seok Il Kim) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.11
We report a centerless grinding machine which can perform multi-function with 600 mm wide grinding wheels. By increasing manufacturing area, long workpiece such as camshaft and steering shaft, is allowed to grind more quickly, compared with cylindrical grinding system. In this paper, the design of centerless grinding machine puts emphasis on symmetry to exploit the thermal stability. Results of finite element analysis shows that the difference of the structural deflection in the front and rear guideways is less than 1.5 μm due to symmetric design. The difference is less than 3.0 μm, even though the thermal deformation is considered. According to the performance evaluation, the radial error motion of the G/W spindle, which is measured by applying Donaldson Ball Reversal, is about 1.1 μm. The yaw error of the G/W slide is improved from 2.1 arcsec to 0.5 arcsec by readjusting the slide preload and ball screw.
박천홍(Chun Hong Park),황주호(Joo Ho Hwang),조순주(Soon Joo Cho),조창래(Chang Rae Cho) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.11
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 were performed in this paper. Layout and details of spindle system were 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 urn 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 agreed well with the designed value. From these results, it was estimated that the prototype of spindle system had enough performances for the centerless grinding machine to machine the ferrule.
박천홍(Chun Hong Park),황주호(Joo Ho Hwang),조순주(Soon Joo Cho) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
In order to practicalize high precision centerless grinder for machining the ferrule, its feeding system is designed and tested. For satisfying the desired diametric tolerance and cylindricity of the ferrule, the feeding system is designed to have relatively high axial stiffness of 600 N/㎛, high angular motion accuracy of 0.5 arcsec/㎜ in yaw direction and minimum resolution of 0.05 ㎛. A prototype of feeding system is built up with hydrostatic guideway and ballscrew. A linear scale with 0.05 ㎛ of resolution is used for position feedback. Experimental results show that the feeding system has the infinity of axial stiffness within the range of 1000 N and 0.3 arcsec/㎜ of yawing error. Also the feeding system shows obvious step response against 0.05 ㎛/step command without the lost motion or backlash. Although the vertical stiffness is reduced to 440 N/㎛ by the elastic deformation of rail, it is good enough to use for machining the ferrule. From above, it is confirmed that the feeding system is applicable to centerless grinder for machining the ferrule.