龙门式微铣削系统的结构优化与实验研究
发布时间：2018-08-11 19:33
【摘要】：本文以微小零件切削加工为研究背景,设计研制了龙门式微铣削加工系统。该加工系统的整体尺寸为600mm×600mm×500mm,系统具有四个直线移动轴和一个旋转轴,加工范围为200mm×50mm×50mm。根据微小零件铣削加工的要求,对系统整体和部件进行了结构设计。利用有限元分析软件,对龙门结构进行动静态结构分析,研究了龙门结构的变形趋势和最大变形发生的位置;其次对龙门结构进行模态分析,获得系统的固有频率和主要振型;根据龙门结构的变形趋势、模态,对横梁和立柱进行了多目标参数优化,提高结构的静、动态刚度,从而提高了系统的性能,采用锤击试验法进行机床的模态试验,获得了实际情况下的固有频率和阻尼比,证实了有限元分析的有效性。应用多体系统的理论对系统进行误差建模,分析了影响系统误差的每个环节,建立龙门式微铣削系统的误差模型,为加工中误差的补偿提供了依据。以研制龙门式微铣削加工系统为实验平台,进行了正交式微铣削实验,研究了切削参数(主轴转速、轴向切深、进给速度)对零件表面粗糙度的影响规律,得到了合理的切削参数。进行了零件表面粗糙度Cpk的计算,验证了龙门式微铣削系统加工状态的稳定性,所选切削参数的合理性。
[Abstract]:In this paper, based on the research background of micro parts cutting, a gantry micro milling system is designed and developed. The overall size of the system is 600mm 脳 600mm 脳 500mm. The system has four linear moving shafts and a rotary shaft. The machining range is 200mm 脳 50mm 脳 50mm. According to the requirement of small parts milling, the whole system and parts are designed. The dynamic and static structural analysis of the gantry structure is carried out by using the finite element analysis software, and the deformation trend and the position of the maximum deformation are studied. Secondly, the modal analysis of the gantry structure is carried out, and the natural frequency and the main vibration modes of the system are obtained. According to the deformation trend and modal of the gantry structure, the multi-objective parameter optimization of the beam and column is carried out to improve the static and dynamic stiffness of the structure, thus improving the performance of the system. The modal test of the machine tool is carried out by hammering test method. The natural frequency and damping ratio are obtained, and the validity of finite element analysis is verified. The theory of multi-body system is used to model the error of the system, and every link that affects the system error is analyzed. The error model of the gantry micro-milling system is established, which provides the basis for the error compensation in machining. The orthogonal micro-milling experiment was carried out on the platform of developing a gantry micro-milling system, and the influence of cutting parameters (spindle speed, axial tangent depth, feed speed) on the surface roughness of parts was studied. Reasonable cutting parameters are obtained. The calculation of surface roughness Cpk is carried out to verify the stability of the machining state and the rationality of the selected cutting parameters of the gantry micro-milling system.
【学位授予单位】：长春理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG54
本文编号：2178026
[Abstract]:In this paper, based on the research background of micro parts cutting, a gantry micro milling system is designed and developed. The overall size of the system is 600mm 脳 600mm 脳 500mm. The system has four linear moving shafts and a rotary shaft. The machining range is 200mm 脳 50mm 脳 50mm. According to the requirement of small parts milling, the whole system and parts are designed. The dynamic and static structural analysis of the gantry structure is carried out by using the finite element analysis software, and the deformation trend and the position of the maximum deformation are studied. Secondly, the modal analysis of the gantry structure is carried out, and the natural frequency and the main vibration modes of the system are obtained. According to the deformation trend and modal of the gantry structure, the multi-objective parameter optimization of the beam and column is carried out to improve the static and dynamic stiffness of the structure, thus improving the performance of the system. The modal test of the machine tool is carried out by hammering test method. The natural frequency and damping ratio are obtained, and the validity of finite element analysis is verified. The theory of multi-body system is used to model the error of the system, and every link that affects the system error is analyzed. The error model of the gantry micro-milling system is established, which provides the basis for the error compensation in machining. The orthogonal micro-milling experiment was carried out on the platform of developing a gantry micro-milling system, and the influence of cutting parameters (spindle speed, axial tangent depth, feed speed) on the surface roughness of parts was studied. Reasonable cutting parameters are obtained. The calculation of surface roughness Cpk is carried out to verify the stability of the machining state and the rationality of the selected cutting parameters of the gantry micro-milling system.
【学位授予单位】：长春理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG54
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相关期刊论文 前3条
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