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| 声信号辅助同轴视觉激光模具修复飞溅控制 |
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刘立君1,2, 柳学杨2, 兰虎3, 张伟杰1, 贾志欣1, 李继强1
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1.浙江大学 宁波理工学院, 宁波 315100;2.浙江大学 机械工程学院, 杭州 310027;3.哈尔滨理工大学 材料科学与工程学院, 哈尔滨 150080
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| 摘要: |
| 在模具表面激光强化过程中,当单位材料激光能量达到一定值时,微小的离焦量波动就会导致飞溅缺陷的产生,对模具表面强化质量有较大的影响. 利用CCD同轴视觉对激光强化的过程进行实时采集并处理,提取焊道宽度信息,作为电流一定情况下飞溅产生的一个特征量. 但仅仅依靠视觉图像不能够保证检测的准确性,而声信号强度与激光能量有直接的关系,通过试验验证了这种关系. 探索了声信号的均方根与飞溅产生的关系. 通过声信号辅助同轴视觉对焊接过程的监测,通过不同的方面对激光模具修复飞溅的检测,极大的提高了飞溅检测的准确性. |
| 关键词: 模具激光强化 离焦量 同轴视觉 声信号 |
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| 基金项目:国家自然科学基金资助项目(51275468);浙江省自然科学基金资助项目(Y1110262,LY12E05015);黑龙江省自然科学基金资助项目(E201240);宁波市自然科学基金项目(2014A610078);浙江省零件轧制成形技术研究重点实验室开放基金资助项目(ZKL-PR-200303);哈尔滨市优秀学科带头人基金资助项目(2012RFXXG75) |
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| Splash control of laser mould strengthen based on coaxial visual supplemented by acoustical signal |
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LIU Lijun1,2, LIU Xueyang2, LAN Hu3, ZHANG Weijie1, JIA Zhixin1, LI Jiqiang1
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1.Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China;2.Zhejiang University, Hangzhou 310027, China;3.Harbin University of Science and Technology, Harbin 150080, China
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| Abstract: |
| During laser strengthening mould surface, a tiny wave of defocusing amount will generate splash as laser energy reach a certain value, which has strong effect on mould surface strengthening quality. By real-time collecting and processing the picture while laser strengthening the mould surface using CCD coaxial visual, the width of weld bead was extracted as the characteristic quantity of splash under fixed current. Acoustic signal strength has direct relation with laser energy and the relationship between acoustical signal RMS and splash was also investigated. Coaxial visual supplemented by acoustical signal achieve detecting laser strengthening splash using different sensor, improving remarkably the accuracy of splash detecting. |
| Key words: mould laser strengthen off-focus value coaxial visual acoustic signal |
