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超声辅助单点金刚石车削碳化钨光学模具

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

作者信息

Li Zhanjie, Jin Gang, Fang Fengzhou, Gong Hu, Jia Haili

机构信息

Tianjin Key Laboratory of High Speed Cutting and Precision Machining, Tianjin University of Technology and Education, Tianjin 300222, China.

State Key Laboratory of Precision Measuring Technology & Instruments, College of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China.

出版信息

Micromachines (Basel). 2018 Feb 12;9(2):77. doi: 10.3390/mi9020077.

DOI:10.3390/mi9020077
PMID:30393353
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6187239/
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.

摘要

为实现用于透镜模具的硬质合金的高效、低损伤及高精度加工，首先开发了一种高频超声振动切削系统。然后，利用自主研发的高频超声振动切削系统，采用聚晶金刚石（PCD）刀具对硬质合金进行精密加工。研究了硬质合金延性域加工中的刀具磨损机理，分析了加工过程中的刀具退让现象。随后采用单晶金刚石刀具进行超精密加工的实验结果表明：在高频超声振动切削条件下，采用刀尖半径较小的金刚石刀具可获得纳米级的表面粗糙度，且加工表面未发现磨削表面那样的缺陷。单晶金刚石刀具的磨损机制主要为磨粒磨损和微崩刃。针对该问题，通过受力分析提出了一种负前角倾斜超声振动切削方法，该方法可进一步降低刀具磨损和加工表面粗糙度。该研究对硬质合金的高效、高质量超精密加工具有重要意义。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9994/6187239/3138bd19dbec/micromachines-09-00077-g017.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9994/6187239/3138bd19dbec/micromachines-09-00077-g017.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9994/6187239/f46b3c48748e/micromachines-09-00077-g001.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9994/6187239/779ed783c9b5/micromachines-09-00077-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9994/6187239/5e9027d61055/micromachines-09-00077-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9994/6187239/31f828a4e4c6/micromachines-09-00077-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9994/6187239/b9c51cc2cb13/micromachines-09-00077-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9994/6187239/c6e592f56f22/micromachines-09-00077-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9994/6187239/072e7ae2d7c3/micromachines-09-00077-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9994/6187239/722e59f7d468/micromachines-09-00077-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9994/6187239/b3e508b08b64/micromachines-09-00077-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9994/6187239/9441d5320574/micromachines-09-00077-g014.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9994/6187239/6866b0cf5b73/micromachines-09-00077-g015.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9994/6187239/f1d9f110c0dc/micromachines-09-00077-g016.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9994/6187239/3138bd19dbec/micromachines-09-00077-g017.jpg

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