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Micromachines 2018, 9(2), 77; https://doi.org/10.3390/mi9020077

Ultrasonically Assisted Single Point Diamond Turning of Optical Mold of Tungsten Carbide

1
Tianjin Key Laboratory of High Speed Cutting and Precision Machining, Tianjin University of Technology and Education, Tianjin 300222, China
2
State Key Laboratory of Precision Measuring Technology & Instruments, College of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China
*
Author to whom correspondence should be addressed.
Received: 10 January 2018 / Revised: 3 February 2018 / Accepted: 8 February 2018 / Published: 12 February 2018
(This article belongs to the Special Issue Micro-Machining: Challenges and Opportunities)
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Abstract

To realize high efficiency, low/no damage and high precision machining of tungsten carbide used for lens mold, a high frequency ultrasonic vibration cutting system was developed at first. Then, tungsten carbide was precisely machined with a polycrystalline diamond (PCD) tool assisted by the self-developed high frequency ultrasonic vibration cutting system. Tool wear mechanism was investigated in ductile regime machining of tungsten carbide. The cutter back-off phenomenon in the process was analyzed. The subsequent experimental results of ultra-precision machining with a single crystal diamond tool showed that: under the condition of high frequency ultrasonic vibration cutting, nano-scale surface roughness can be obtained by the diamond tool with smaller tip radius and no defects like those of ground surface were found on the machined surface. Tool wear mechanisms of the single crystal diamond tool are mainly abrasive wear and micro-chipping. To solve the problem, a method of inclined ultrasonic vibration cutting with negative rake angle was put forward according to force analysis, which can further reduce tool wear and roughness of the machined surface. The investigation was important to high efficiency and quality ultra-precision machining of tungsten carbide. View Full-Text
Keywords: tungsten carbide; lens mold; single point diamond turning (SPDT); ultrasonic vibration; Ductile regime; surface quality; wear tungsten carbide; lens mold; single point diamond turning (SPDT); ultrasonic vibration; Ductile regime; surface quality; wear
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Li, Z.; Jin, G.; Fang, F.; Gong, H.; Jia, H. Ultrasonically Assisted Single Point Diamond Turning of Optical Mold of Tungsten Carbide. Micromachines 2018, 9, 77.

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