一种双面负角铣削刀片模具补偿设计方法的研究
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摘要
为了解决模压成型中双面负角铣削刀片顶部和底部刀尖高尺寸一致性的问题,本文通过对双面负角铣削刀片刀尖部分数学模型分析,结合填料过程中粉末的流动特性,提出了一种可实现仿形填料的补偿模具设计方法。推导并建立了模体填料腔的补偿结构及尺寸数学模型,并采用离散元方法对仿形填料过程进行模拟仿真,验证了补偿设计的合理性。结果表明,补偿料槽的高度t、宽度A以及斜面角度θ分别取决于产品高于定位面部分槽型的宽度w、高度l以及它们所形成的倾角γ;对模体进行补偿设计后,实现了产品刀尖高尺寸一致性控制在0.03 mm以内,达到国外同类产品水平。
In order to solve the problem of the height difference between the top and bottom of the double-sided negative milling insert in the mould pressing, the mathematical model of the tip of the double-sided negative milling insert is analyzed,combined with the flow characteristics of the powder in the filling process, and a method to design the compensation mold for the copying packing is proposed. The mathematical model of the compensation structure size of the filling cavity is deduced and established, and the simulation of the process of the copying packing is carried out by the discrete element method, which verifies the rationality of the compensation design. The results show that the height t, width A and bevel angle θ of the storage tank depend on the width w and height l of the groove above the positioning surface and the inclination γ formed by them respectively. After the compensation design of the die body, the height difference of the insert is controlled within 0.03 mm,reaching the level of similar foreign products.
In order to solve the problem of the height difference between the top and bottom of the double-sided negative milling insert in the mould pressing, the mathematical model of the tip of the double-sided negative milling insert is analyzed,combined with the flow characteristics of the powder in the filling process, and a method to design the compensation mold for the copying packing is proposed. The mathematical model of the compensation structure size of the filling cavity is deduced and established, and the simulation of the process of the copying packing is carried out by the discrete element method, which verifies the rationality of the compensation design. The results show that the height t, width A and bevel angle θ of the storage tank depend on the width w and height l of the groove above the positioning surface and the inclination γ formed by them respectively. After the compensation design of the die body, the height difference of the insert is controlled within 0.03 mm,reaching the level of similar foreign products.
引文
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[2]张广庆,徐楠,王媛.粉末冶金压制成形理论与工艺综述[J].热加工工艺,2017,46(19):9-14.Zhang Guangqing,Xu Nan,Wang Yuan.Review on theory and technology of powder metallurgy pressing forming[J].Hot Working Technology,2017,46(19):9-14.
[3]易为,许鹏飞,王东海.双面八角形可转位铣刀片设计的有限元仿真与试验研究[J].硬质合金,2017,34(5):332-339.Yi Wei,Xu Pengfei,Wang Donghai.Finite element simulation and experimental study on the design of double-sided octagon indexable milling insert[J].Cemented Carbide,2017,34(5):332-339.
[4]申小平,许桂生.粉末冶金压坯缺陷分析[J].粉末冶金技术,2012,30(4):279-287.Shen Xiaoping,Xu Guisheng.Defect analysis of powder metallurgy compact[J].Powder Metallurgy Technology,2012,30(4):279-287.
[5]阮建明,黄培云.粉末冶金原理[M].北京:机械工业出版社,2012.Ruan Jianming,Huang Peiyun.Principle of powder metallurgy[M].Beijing:China Machine Press,2012.
[6]吴成义,张丽英.粉体成型力学原理[M].北京:冶金工业出版社,2003:85-92.Wu Chengyi,Zhang Liying.Mechanics of powder forming[M].Beijing:Metallurgical Industry Press,2003:85-92.
[7]陈晨.粉末冶金模具设计中的影响因素[J].模具制造,2006,(12):73-76.Chen Chen.Main effect factor in powder metallurgy forming die design[J].Die&Mould Manufacture,2006,(12):73-76.
[8]辛海艳,史顺亮,吴翔,等.WC总碳含量对WC-9%Co硬质合金收缩系数影响的研究[J].稀有金属与硬质合金,2015,43(6):69-72.Xin Haiyan,Shi Shunliang,Wu Xiang,et al.Study on influence of WCtotal carbon content on shrinkage coefficient of WC-9%Co cemented carbide[J].Rare Metals and Cemented Carbides,2015,43(6):69-72.
[9]印红羽,张华诚.粉末冶金模具设计手册[M].北京:机械工业出版社,2002.Yin Hongyu,Zhang Huacheng.Powder metallurgy mould design manual[M].Beijing:China Machine Press,2002.
[10]赵丽丽,张严,许鹏飞,等.硬质合金混合料粒度分布对成型尺寸精度的影响[J].硬质合金,2018,35(5):344-350.Zhao Lili,Zhang Yan,Xu Pengfei,et al.nfluence of particle size distribution of powder mixture on molding precision of cemented carbide[J].Cemented Carbide,2018,35(5):344-350.
[11]周蕊.末冶金压坯残余应力和热裂纹损伤的研究[D].津:天津大学,2013.Zhou Rui.Tudy on residual stress and cracks damage of powder metallurgy compacts[D].Tianjin:Tianjin University,013.