Fabrication of sub-mini meter molds made of hard and brittle material

• Main Authors: Tsung-Yu Yang, 楊宗祐
• Other Authors: 趙崇禮
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/63c52h

碩士 === 淡江大學 === 機械與機電工程學系碩士班 === 102 === Owing to the fast development in opto-electronic, semiconductor, components of high precision and customized shapes are in great demand. The optical components have evolved from planar, spherical, aspheric to free-form geometries. As the demand for precision optical components with sub-millimetre feature size steadily increasing, numerous efforts have been made in developing new techniques and in improving the existing approaches to efficiently and economically produce those components. Glass moulding process (GMP) is one of these methods to enable mass production of precision glass optical components in recent years. One of the key issues in GMP is precision mould fabrication. Since the mould are normally made of hard and brittle materials such as tungsten carbide (WC) and silicon carbide (SiC), precision diamond grinding is by far the principal choice used to machine the GMP mould. As the feature size of optical component gets smaller, the size of mould and grinding wheel used to fabricate the mould gets smaller too. This makes the grinding process a very time consuming and expensive task. This research aimed to improve the small mould fabrication processes by developing an effective way of producing small diamond wheels and precision grinding/polishing processes. Diamond wheels of around 0.5mm in diameter after truing and WC aspheric moulds of surface roughness around 63 nm and 10 nm (Ra) after grinding and polishing respectively were successfully produced in this research.