Общий каталог Sumitomo 2018 - 2019 - страница 493

SUMIBORON / SUMIDIA Production Process - General Since 1970s, Sumitomo has pioneered the development of sintered cubic boron nitride (CBN) and sintered diamond (PCD) tools successfully used in the tool making industries. These tool materials can be epoch-making in a sence of broadening the cutting application range. - Production Process In the production process of SUMIBORON / SUMIDIA, CBN To manufacture final products round discs of SUMIBORON powder / diamond powder is firstly synthesized under the ultra and SUMIDIA material are cut into specific shapes and - high pressure, and secondly, the synthesized crystalline brazed on to tool bodies made of cemented carbide, or steel, grains are sintered. etc., and after that finished by grinding the edge. In another process the final product can be obtained only by Fig. 2 shows a diagram of high temperature high pressure cutting blanks and finishing them. apparatus for processing the ultra - high pressure sintering operation. This apparatus is basically composed of a piston and a cylinder to generate ultra - high pressure as high as 5000 N/ mm2 with a special device. The piston and cylinder are made of cemented carbide. Sintered blanks Final product Fig. 1 Fig. 2 Pressure Support steel ring Graphite / hBN (Cutting) (Brazing) (Finishing) Ultra high pressure synthesizing Carbide piston Carbide Carbide cylinder Sintered layer CBN / Diamond Binder Electrode Carbide layer Ultra high pressure Brazing synthesizing Sumiboron / Sumidia - SumiBoron / SumiDia Grinding Method Items SumiBoron SumiDia 1) Carbide grinding machine is applicable. Grinding 1) Special-purpose high rigidity grinding machine is desirable. – 2) R Pointer should be used. machine 2) Be sure of applying with wet system. 3) Should be wet grinding. SUMI BORON SUMI DIA Abrasive Diamond Diamond Rough grinding: D 35 (#400 mesh) Grain size D 25 - medium, D20 - fine (#400 ~ 800) Finish grinding: D 25 (#800 ~ 1500 mesh) Wheel Bond Resinoid or vitrified Special-purpose metal bond for diamond sintered tool or vitrified Concentration 100 100 ~ 125 Dressing Use # 400 WA stick Execute dressing with a WA stick of about 400 mesh. Wheel speed 800 ~ 1000 m/min. 800 ~ 1000 m/min. Grinding Table cycle 30 ~ 60 cycles/min. 30 ~ 60 cycles/min. condition Grinding oil Water soluble grinding coolant oil Water soluble grinding coolant (Solution type) 1) Rake surface is lapped generally 1) Check chipping of the cutting edge with microscope 2) Inspect with microscope of magnification of 30-50 times after finishing. if there is edge chipping. Others – 3) Edge treatment of tool should be sharp for cutting non- 2) Blank surface cut by EDM should be ground ferrous metals. more than 0,05 mm 4) Remove the wire-cut surface of blank by 0,05 mm or more in grinding operation. L22