선택한 단어 수는 입니다.
최소 단어 이상 선택하여야 합니다.
최소 단어 이상 선택하여야 합니다.
선택한 단어 수는 30입니다.
최대 10 단어까지만 선택 가능합니다.
최대 10 단어까지만 선택 가능합니다.
제안 방법
- During truing, the ELID voltage and current were inputted to 90V and 20A, respectively, when using #140, #600, and #2,000 wheels, and 60V and 10A when using the #8,000 wheel. After truing was complete, diameters of BK7 specimen and wheel were measured to create the numerical control (NC) data code, and a total of 10 measurements were obtained to calculate a mean for the dimension reliability. The experimental conditions are summarized in Table 2.
- In this study, ultra-precision machining experiments were conducted to fabricate a large-area off-axis aspheric reflector mounted in the 8-inch collimator optical system. This study proposed a method to evaluate the surface roughness and surface profile precision of the completed large-area reflector by applying ELID grinding to the cylindrical BK7 glass material using an ultra-precision rotary grinder and measuring the reference workpiece.
- Since the diameter of the large-area reflector as a workpiece was more than 200 mm, a large 3D shape measurement device was needed to measure the aspheric surface profile precision. Since the size of the workpiece that was fabricated in this experiment exceeded the measurement range of the UA3P device, the shape precision of the reference workpiece was measured to predict the precision of the large-area workpiece. The shape precision of the workpiece was predicted after machining with #2,000 and #8,000 wheels and measuring the reference workpiece in the 3D shape measurement device (UA3P, Panasonic).
- In this study, ultra-precision machining experiments were conducted to fabricate a large-area off-axis aspheric reflector mounted in the 8-inch collimator optical system. This study proposed a method to evaluate the surface roughness and surface profile precision of the completed large-area reflector by applying ELID grinding to the cylindrical BK7 glass material using an ultra-precision rotary grinder and measuring the reference workpiece.
- This study proposed a method to predict large-area reflector precision by measuring surface roughness and profile accuracy through the reference workpiece after machining a BK7 glass workpiece with an ultra-precision rotary grinder to fabricate a large-area off-axis aspheric reflector. The ELID grinding machining results using 10 nm resolution of ultra-precision rotary grinder by applying grit sizes of #140, #600, #2,000, and #8,000 sequentially revealed the following conclusions.
대상 데이터
- To perform the experiments, two workpieces (⌀ 211.5 mm) of a real large-area reflector and one reference workpiece (⌀ 50 mm) were fabricated. They were fixed in the same jig, and off-axis aspheric machining was conducted using an ELID grinding machining.
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