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工程科学与技术:2014,46(5):181-187
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磨料射流中高分子聚合物的微量添加对切割性能的影响
(1.中国矿业大学(北京) 资源与安全工程学院;2.中国平煤神马集团;3.武汉大学 水射流理论与新技术湖北省重点实验室)
Influence of Adding a Small Amount High Molecular Polymer on Cutting Performance of Abrasive Water Jet
(1.Faculty of Resources & Safety Eng.,China Univ.of Mining & Technol.(Beijing);2.China Pingmei Shenma Energy & Chemical Group;3.Key Lab.of Hubei Province for Water Jet Theory & New Technol.,Wuhan Univ.)
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投稿时间:2014-02-16    修订日期:2014-05-07
中文摘要: 从提高射流利用率出发,在后混合磨料水射流切割系统中添加高分子聚合物(PAM),主要通过使用粗糙度轮廓仪考察大理石加工面粗糙度变化特征,进而揭示PAM浓度影响切割质量的机理及规律。结果表明,PAM溶液与纯磨料水射流所对应的加工面粗糙度沿切深方向变化均表现为在初始段略微减小后即显著上升。进一步研究还发现,PAM浓度在c≈400 mg/kg时才具有明显的减阻效果使得加工面粗糙度显著降低,且在c≈600 mg/kg时由于聚合物黏弹性应力与大量小尺度涡旋能级匹配实现最大限度减阻,由此可获得最佳的表面质量。此外,不同PAM浓度对表面粗糙度的影响程度随靶距或切割速度的增加显著提高,利用此特性可优化水刀工作参数以提高其加工效率。切缝宽度测试结果表明,其值沿切深方向在c≈ 600 mg/kg处收缩最小,这说明合适PAM浓度确能有效改善射流结构特征,达到提高射流切割能力之目的。
Abstract:In order to improve the utilization of jet energy,an experiment was conducted with a kind of polymer(PAM) added into the injection abrasive water jet for cutting.The roughness of machined surface was measured by mitutoyo surftest to evaluate the influence of PAM concentration on the surface quality.The results showed that the roughness of machined surface shaped by abrasive water jet with PAM slightly decreased at first and then remarkably increased with the increase of cutting depth.Meanwhile,the roughness formed by abrasive water jet without PAM had a similar tendency.Furthermore,it was worth noting that the roughness was significantly reduced when the PAM concentration arrived at 400 mg/kg,where the drag reduction effect was remarkable.When the PAM concentration came up to 600 mg/kg,the optimal surface quality was obtained because of the occurrence of the maximum drag reduction effect.At that point,the viscoelastic stress of polymer showed good match with the energy level of most small vortexes.In addition,the effect of PAM concentration on the roughness became more and more remarkable with the increase of standoff distance or feed rate,such behavior was of great importance in optimizing the operating parameters of water cutter so as to improve its efficiency.Also,the kerf width of workpiece along cutting depth gave a minimum change at the PAM concentration of 600 mg/kg.It was concluded that the appropriate PAM concentration increased the energy of the jets,and greatly improved the cutting ability.
文章编号:201400149     中图分类号:    文献标志码:
基金项目:国家重点基础研究发展计划资助项目(2011CB201205);湖南省科技厅资助项目(2013SK3165);中国博士后基金资助项目(2013M0351);湖北省自然科学基金资助项目(2012FFB04501)
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引用文本:
张友谊,王晓川,胡东.磨料射流中高分子聚合物的微量添加对切割性能的影响[J].工程科学与技术,2014,46(5):181-187.
Zhang Youyi,Wang Xiaochuan,Hu Dong.Influence of Adding a Small Amount High Molecular Polymer on Cutting Performance of Abrasive Water Jet[J].Advanced Engineering Sciences,2014,46(5):181-187.