Introduce precision machining technology in micro-optics Processing
Ultra-precision machining technology is the use of the tool to change the shape of the material or damage the surface of the material to form a cutting to achieve the desired shape. The single crystal diamond turning and milling, grinding, fast cutting and mechanical polishing. This section focuses on the ultra-precision machining technology for the processing of optical components and molds.
Ultra-precision machine tool development of key technologies
Computer-aided design technology, especially the development of finite element analysis technology to optimize the design of the overall structure of ultra-precision machine tool provides a convenient means of making the machine rigidity and stability continues to increase. Currently the typical structure of single-crystal diamond lathe having "T" type layout structure, the spindle is generally mounted on the rail in the X direction, the tool is mounted to the rail Z. In the last ten years, with the rapid development of computer technology, some of the key technology of ultra-precision machine tools, such as control technology, aspects of the feedback system, servo drives, etc. have made great progress to improve the ultra-precision machining accuracy, At present, ultra-precision machining has been able to direct a surface roughness of 1nm. The development of key technologies can be summed up in the following areas: ultra precision machining with machine bed made of natural granite, it has a very high thermal and mechanical stability; the use of an air spring vibration isolation system; the use of a liquid or gas static pressure rails, damping increases, precision parts movement smooth, frictionless; DC linear motor drive system fast, has good dynamic stiffness; high-speed air spindle, high load capacity, rigidity and precision parts, machining accuracy can be improved; Open computer numerical control technology (CNC), to facilitate the application of third party control software, improve processing accuracy; high-resolution detection device that can provide accurate position feedback; the use of fast servo mechanism to achieve macro micro multi-axis systems combine technologies to process complex profile; on-line measurement and error compensation, accurate measurement of the workpiece residual error and eventually eliminate errors.
Precision parts Application examples
The development of electronic technology and optical technology has greatly promoted the application of free non-spherical geometry and other non-traditional micro-structure of the optical element. The emergence of a number of optical design software, so that the optical designer can easily optimize the performance of the optical system, but it will also make the optical element becomes complicated, which requires micro-optics manufacturing technology capable of processing these complex optical elements . For micro-optics designer and manufacturer, the single crystal diamond ultra-precision machining technology has many advantages, such as ultra-precision machining can be processed truly three-dimensional structure; forming precision machining of parts with submicron; surface roughness of Ra value 5nm, some material may even reach 1nm; structure capable of processing a large aspect ratio and the like. Thus, ultra-precision machining in the past ten years, the ultra-precision machining technology application example in micro-optics machining is gradually increasing. The single crystal diamond ultra-precision machining technology has been successfully used in processing contact lenses, prisms, aspherical lens, a microlens array, pyramid microstructured surface, anti-reflective grating structure. Micro structures of single crystal diamond lathe. Although the ultra-precision machining technology for processing certain structure of the optical element has many advantages, but the ultra-precision processing technology and replication molding technology combined processing micro-optical element is perhaps the most effective way, which uses ultra-precision processing technology to process replication tool and then using the mold to produce a micro-optical elements. Monocrystalline diamond lathe optical element mold, need to pay attention to select the appropriate processing parameters to reduce glitches, reduce the error of the mold, in addition to be able to process a suitable diamond tools. Diamond lathe mold to produce a Fresnel lens for overhead projectors have been a great success.
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