摘要
【目的】农业机械化作业中,轮盘零件常用于辅助机构实现行走功能。笔者以亚克力为材质,设计了一种轻量化行走结构,每个结构均由两个相同轮盘零件通过反向螺纹联接为一组,在作业机械设备前、后各装两组形成设备行走系统。【方法】从机床选用、装夹设计、刀具使用、毛坯确定等方面对轮盘零件进行了工艺分析,编制了该零件的数控加工工序卡,研究了基于NX平台的零件数控加工编程策略应用,围绕该零件轴向阶梯孔、通孔、环形槽、径向沉孔以及螺纹等特征,综合采用了平面铣、定心钻、固定轮廓铣、可变轮廓铣、螺纹铣等加工策略进行编程,对不同特征所涉及不同策略使用的切削参数(切削模式、边界、深度范围、切削层、余量等)、非切削参数(进刀、退刀等)、加工部位、刀轴、刀具及驱动要素等作了优化设置,最后通过在德马吉DMU50五轴加工中心开展实物加工以进一步验证该零件数控加工工艺的正确性。【结果】经过检测,零件的各项精度均满足要求,整体结果良好。【结论】通过针对性实践,不仅提升了数控技术综合能力水平,也深化了质量意识和效率意识,同时为亚克力材质零件的数控加工提供了借鉴依据,有一定积极意义。
[Objective]In agricultural mechanization operation,wheel-parts are often used to assist the mechanism to realize the walking function.Selecting acrylic as the material,the author designed a lightweight walking structure,composed of two same wheel parts through thread connection,in the operation of the mechanical equipment before and after the installation of two groups to form the equipment walking system.[Method]Systematic process analysis of the wheel-part is carried out from many aspects such as machine-selection,clamping-design,tool-use,blank determination,etc.CNC machining process card is not only compiled,but also the application of CNC machining programming strategy based on NX is studied.This part includes characteristics such as step-hole,through-hole,ring-roove,radial countersink,thread and so on.The machining strategies such as plane milling,fixed drilling,fixed milling,variable-milling and thread were comprehensively used for programming,and the cutting parameters(cutting mode,boundary,depth range,cutting layer,margin,etc.),non-cutting parameters(feed,retreat,etc.),machining parts,tool shafts,tools and driving factors were optimized for different strategies involved in different characteristics.Finally,the correctness of the CNC machining technology of the part was further verified by the physical machining in Demaji DMU50 five-axis machining center.[Result]Via test,the accuracy of the part meets the requirements,and the overall result is good.[Conclusion]Through targeted practice,it not only improves the comprehensive ability of CNC technology,but also deepens the awareness of quality and efficiency,and provides a reference basis for CNC processing of acrylic parts,which has certain positive significance.
作者
孟晓华
Meng Xiaohua(Shanxi Institute of Mechanical&Electrical Engineering,Shanxi Changzhi 046011)
出处
《南方农机》
2023年第18期30-33,63,共5页
基金
山西省教育科学“十三五”规划课题“‘职场情境体验式’教学模式在高职院校的试点探究”(GH-19224)
山西省高等学校科技创新项目“数控锁刀器创新设计与研究”(2020L0758)。
关键词
数控加工
加工工艺
加工策略
CNC machining
machining technology
machining strategy
