机架是冷敲机设备的重要组成部件,其动态特性的优良直接影响到花键成形精度、机架使用寿命和设备工作性能。本文基于ANSYS软件平台,对自主研发的LQ-200数控冷敲机机架的前6阶振动特性参数和振动最大位移量进行了计算和分析,通过优化设计筋板尺寸改进了机架结构,改进后机架的模态参数变化不大,但振动最大位移量较改进前减小了64%。研究表明:冷敲机整机机架的振动形式主要以立式机身的扭转和弯曲为主,连接立式机身左右两立柱的上筋板、后筋板容易发生变形,固定传动齿轮轴的两个对称筋板在各阶模态振动中的变形较大。并且,改进后机架在没有显著增加机身质量的情况下,机架整体刚度得到增强,振动水平降低,整机性能稳定。本研究不仅为冷敲机机架动态设计提供了可靠的理论依据,而且为后续的瞬态分析、谐响应分析奠定了基础。
Frame is one of the key parts of cold striking machine and the quality of its dynamic characteristic direct-ly influences the forming precision of spline,the life of frame and the working performance of the machine. In this paper ,the first 6 modal parameters of LQ-200 cold striking machine frame were calculated and analyzed by ANSYS software,as well as the maximum deformation of frame. Then,the frame was improved via optimal design of stiffened plate. As a result,the vibration modes of improved frame were similar to that of original frame,while its maximum deformation reduced by 64%. The research showed that:the main vibration modes of cold striking machine frame manifested the torsion and bend of vertical body,meanwhile,the front and back stiffened plates connecting the two columns of vertical body were liable to deform,and the deformation of stiffened plates for fixing gear shaft were lar-ger in each order modal. Furthermore,the whole rigidity of improved frame was strengthened and the vibration lev-els were reduced without a significant increase in frame weight. This study not only provided a reliable theoretical instruction for dynamic design of cold striking machine,but also laid a foundation for subsequent transient and har-monic analysis.