Jinan Hongxiang Cutting Tools Co., Ltd
Tel:0086-0531-85765156
FAX:0086-0531-85765376
Email:cnskdj@126.com
Website:www.cnskdj.com
Address:Ji'nan city of Shandong Province
Ultra precision machining of ultra precision diamond tool is a kind of processing technology which can realize nanometer size precision and surface roughness. Recently, the ultra precision machining technology has been applied in the field of photoelectric and biology. Ultra precision diamond tool is one of the key factors to realize the ultra precision machining. The Japanese Allied Diamond Corporation (Ultra Precision Cutting UPC produced by Tool) and actual machining tool wear condition introduces performance, ultra precision cutting of different workpiece materials of ultra precision diamond cutting tool at.
1, UPC ultra fine diamond machine tool performance
Single crystal diamond is a kind of cubic crystal structure with strong covalent bonding between carbon atoms, the lattice constant is 3.567, and the distance between atoms is about 1.544. Because of the characteristics of single crystal diamond structure, it can be used as the cutting tool material to obtain the excellent hardness, smooth and sharp cutting edge which other materials do not possess. Ultra precision grinding technology prepared by UPC ultra precision diamond cutting tool, which can maximize the material properties, obtain smooth cutting edge sharpness and wear resistance of both the matching and superfinishing machine of ultra precision machining to achieve high-precision aspheric shape and fine shape.
In order to meet the requirements of ultra precision machining, the cutting depth should be set in the nanometer range. To this end, the cutting tool requirements are as follows: the nose radius R reached the sharpness of tens of nanometers; the cutting edge ridge of the smoothness of the nanometer level. With the same size and nose radius cut deep processing, is not easy to damage the surface of the workpiece is smooth, smooth chip removal, because of cutting thickness changes caused by elastic deformation of workpiece is very small, can achieve ultra precision machining.
2, UPC tool processing different workpiece material wear state difference
The thermo chemical wear state of diamond tools is very different according to the different kinds of materials. Linear cutting edge in ultra precision lathe using a knife sharp 130 degree ultra diamond tool for turning on copper and aluminum, the tool wear condition shows that the cutting tool rake face of copper produced crater wear, but still remain sharp cutting edges; the cutting edge cutting of pure aluminum the wear ridge into the arc edge, but the rake face was not found in the crater wear. From the wear condition of the difference can be seen in different wear mechanisms: cutting copper, the cutter from the crater wear is due to the catalytic effect of copper oxide caused by the diamond, and cutting edges for workpiece and gaplessly contact without generating oxidation wear; cutting aluminum, due to work the surface and tool surface direct contact generation aluminum carbide workpiece material is removed so that the cutting edges cutting edge wear, but due to wear and cutting propagation direction of copper instead (extended from the cutting edge back face), does not produce the rake face of crater wear.
Due to the different thermal phenomena of different workpiece materials, the wear state of the cutting tools is also different. Therefore, a reasonable tool rake angle and back angle should be designed according to different kinds of workpiece materials.
3, UPC-R ultra machining examples of diamond tool
UPC-R is a kind of UPC ultra precision diamond cutting tool with arc cutting edge, and its typical application is the ultra precision machining of DVD and other aspheric mirror die. The contour accuracy of UPC-R tool arc cutting edge is less than 50nm, which is the highest accuracy in the world. The arc R is only 5nm, and is the smallest in the world. Including machining points using UPC-R ultra diamond tools in CNC two axis ultra precision machine tools machining aspheric mould: how to form thin and continuous stable and smooth chip removal; the workpiece rotates should have high level of dynamic balance performance; the workpiece can exactly determine the stability of cutting fluid; supply.
Because of the chemical reaction in the process of steel processing, the diamond can be graphitized and diffused to the workpiece, so the UPC diamond tool is not suitable for the ultra precision machining of steel die. However, if the surface of the steel mold with non electrolytic method of plating tens of microns to hundreds of microns thick nickel coating, you can use UPC diamond tools for ultra precision machining. On the quality of coating, amorphous coatings should choose not porosity and segregation crystalline structure defects.
4, UPC-T ultra machining examples of diamond tool
UPC-T is a kind of UPC ultra precision diamond cutting tool, which is mainly used in the ultra precision machining of Finel lens mold and liquid crystal light guide plate. In recent years, high precision, miniaturization and integration of optical components quickly, from the aspheric lens to Finel lens integrated to achieve lightweight, thin, more high requirements of ultra precision machining technology. This is the UPC-T processing model with 1 ultra diamond tool ultra precision machining of micro grating and aspheric shape examples, so the requirements of tool nose cutting edge R < 100nm and has excellent cutting performance. The cutting edge of UPC-T is a small cutting edge of 50nm, which can realize the ultra precision machining.
The machining process of ultra fine diamond tools has been developed as an indispensable method in the manufacture of lens moulds. In the future, with the mold for molding parts quality improvement and high precision and multifunction of the rising market demand, and the growth of medical and biological fields mold processing needs, will continue to promote the development of new NC cutter set.