钨电极侧壁绝缘双极性脉冲电解加工工艺研究

周佐霖; 马世赫; 张永俊; 罗红平; 刘桂贤

doi:10.13433/j.cnki.1003-8728.20200428

钨电极侧壁绝缘双极性脉冲电解加工工艺研究

doi: 10.13433/j.cnki.1003-8728.20200428

周佐霖^{1, 2,},
马世赫^{1, 2},
张永俊^{1, 2},
罗红平^{1, 2},
刘桂贤^{1, 2, ,}

1.
广东工业大学机电工程学院, 广州 510006
2.
广州市非传统制造技术及装备重点实验室, 广州 510006

基金项目:

国家自然科学基金项目 51705088

详细信息

作者简介:
周佐霖(1996-), 硕士研究生, 研究方向为电解加工, 903745710@qq.com

通讯作者:
刘桂贤, 讲师, 硕士生导师, gxliu@gdut.edu.cn

中图分类号: TG662
计量
- 文章访问数: 79
- HTML全文浏览量: 64
- PDF下载量: 13
- 被引次数: 0
出版历程
- 收稿日期: 2020-10-19
- 刊出日期: 2022-07-25

Study on Bipolar Pulse Electrochemical Machining Process of Tungsten Electrode Sidewall Insulation

ZHOU Zuolin^{1, 2
,},
MA Shihe^{1, 2},
ZHANG Yongjun^{1, 2},
LUO Hongping^{1, 2},
LIU Guixian^{1, 2
, ,}

1.
College of Mechanical and Electrical Engineering, Guangdong University of Technology, Guangzhou 510006, China
2.
Key Laboratory of Non-traditional Manufacturing Technology and Equipment, Guangzhou 510006, China

摘要

摘要: 为了解决电解加工中难以对工具侧壁绝缘以及工具涂覆的绝缘层易于损耗的问题，提出了一种在钨工具电极侧壁实时生成绝缘层的方法。为了实现该方法，设计了正负电压、占空比均独立可调的双极性脉冲电解电源。该电路使用两路MOSFET管对两独立直流电源进行控制，并使用STM32控制两路MOSFET管。实验结果表明，实际输出电压波形满足设计要求，输出电压频率在240 kHz以下时有较好的波形；选用1 mm钨棒为工具电极并使用正电压为12 V(占空比为20%)，负电压为19 V(占空比为50%)，正脉冲时间占总脉冲时间90%的双脉冲电源加工不锈钢，对比钨棒侧壁不绝缘的情况，其定域性得到明显改善。
- 钨 /
- 绝缘 /
- 电解加工 /
- 双极性脉冲 /
- STM32
Abstract: In order to solve the problem that it is difficult to insulate the sidewall of the tool and the insulating layer coated by the tool is easy to wear during electrochemical machining, a method of real-time generating an insulating layer on the sidewall of the tungsten tool electrode is proposed. In order to realize the above mentioned, an electrolysis power supply capable of outputting double pulses whose positive and negative voltages and duty cycles are independently adjustable was designed. The present circuit uses two MOSFET (Metal-oxide-semiconductor field effect transistor) tubes to control two independent DC(Direct current) power supplies, and uses STM32 to control two MOSFET tubes. The experimental results show that the actual output voltage waveform meets the design requirements, and the output voltage frequency has a better waveform when the frequency is below 240 kHz. The research uses 1 mm tungsten rod as tool electrode. Comparing the processing of the sidewall of the tungsten rod without insulation, a double-pulse power supply with a positive voltage of 12 V (duty cycle of 20%) is used, a negative voltage of 19 V (duty cycle of 50%) and a positive pulse time accounting for 90% of the total pulse time to process the stainless steel, its localization is significantly improved.
- tungsten /
- insulation /
- electrochemical machining /
- bipolar pulse /
- STM32

HTML全文

图 1 侧壁绝缘原理图

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图 2 电极极化曲线

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图 3 电路原理图

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图 4 电极电位随时间的变化

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图 5 4个PWM波形的关系

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图 6 4个定时器的关系

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图 7 目标输出波形

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图 8 不同频率下输出波形

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图 9 试验平台

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图 10 两种加工参数下的加工波形(黄：电压；蓝：电流)

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图 11 加工前后钨棒对比图

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图 12 两种加工过程效果图

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图 13 两种加工情况下的形貌对比

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