Batch preparation method of ultra-nano diamond coated cutting tool with high finish and complex shape
A diamond coating, high finish technology, applied in metal material coating process, coating, gaseous chemical plating and other directions, can solve the problem that the surface finish of the tool cannot meet the requirements of machining accuracy and tool life, and the surface roughness of the diamond coating High problems, to achieve the effect of low surface roughness, improved machining accuracy and tool life, and high machining accuracy
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[0045] Example 1
[0046] 105 cemented carbide milling cutters for graphite processing (blade diameter 4mm, blade length 20mm, shank diameter 4mm, total length 75mm) were pretreated, that is, "potassium permanganate solution oxidation for 20min to roughen the surface of the cemented carbide, The mixture of concentrated hydrochloric acid and hydrogen peroxide was etched for 30s to remove cobalt from the surface of the cemented carbide, placed in a nano-scale diamond powder suspension with ultrasonic oscillation to evenly plant crystals on the surface of the tool, and placed in acetone for ultrasonic cleaning. Then, the pretreated 105 milling cutters were placed in the reaction chamber of the HFCVD equipment, figure 1 Schematic diagram of the hot wire arrangement for HFCVD batch preparation of high-finish ultra-nano-diamond film-coated cutters. Methane and hydrogen are fed in. The flow rates of methane and hydrogen are 160sccm and 800sccm, the air pressure is 800Pa, the number...
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[0047] Example 2
[0048] 140 tungsten carbide micro-drills (blade diameter 0.3mm, blade length 8mm, shank diameter 3.175mm, total length 38mm) for printed circuit board (PCB) processing were pretreated, that is, the "potassium permanganate solution oxidation for 10min" was carried out in turn. Roughening the surface of cemented carbide, etching with a mixture of concentrated hydrochloric acid and hydrogen peroxide for 8s to remove cobalt from the surface of cemented carbide, placing it in a nanoscale diamond powder suspension, ultrasonically oscillating, and evenly planting crystals on the surface of the tool, placing it in acetone for ultrasound cleaning" process. Then, 140 pretreated PCB micro-drills were placed in the reaction chamber of the HFCVD equipment, and two gas paths were set up. One gas path was filled with 300sccm pure hydrogen, and the other gas path was filled with 250sccm carrier hydrogen. The mixture of acetone and trimethyl borate in the bubbling bottle ...
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[0049] Example 3
[0050] 90 carbide milling cutters for graphite processing (blade diameter 6mm, blade length 15mm, shank diameter 6mm, total length 50mm) were pretreated, that is, "potassium permanganate solution oxidation for 20min to roughen the surface of the cemented carbide, The mixture of concentrated hydrochloric acid and hydrogen peroxide was etched for 30s to remove cobalt from the surface of the cemented carbide, placed in a nano-scale diamond powder suspension with ultrasonic oscillation to evenly plant crystals on the surface of the tool, and placed in acetone for ultrasonic cleaning. Then, 80 pretreated graphite milling cutters were placed in the reaction chamber of the HFCVD equipment. The number of hot wires was 7, the length of the hot wire was 300mm, the power of the hot wire was 8.4kw, the distance between the hot wires was 40 mm, and the distance between the hot wire and the tip of the hot wire was 40 mm. 0mm, two-way gas (methane and hydrogen) was intro...
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