激光切割系统横梁有限元动力学分析与优化

Finite Element Dynamic Analysis and Optimization of the Laser Cutting Machine Crossbeam

激光切割机主要应用于钢板钢材的切割与打孔等。对于大型激光切割机,其切割系统的质量和跨度都比较大,并需要做快速的往返运动,在较大的加速度和惯性力作用下,切割系统的零部件会产生振动,影响激光切割的精度和效率。根据有限元动力学分析方法,对激光切割系统横梁进行有限元模态分析和瞬态分析,分析激光切割机横梁的模态特性以及横梁在加减速运动过程中的瞬态动力学响应。并对激光切割系统横梁进行了改进和优化,在减轻横梁质量16%的前提下,有效提高横梁各阶的固有频率,其中一阶固有频率提升21%,并降低横梁在快速往返运动过程中产生的振幅,横梁3个方向的合振幅降低34.9%,从而有效提高激光切割机切割的效率和切割精度,提升产品的性能。

Laser cutting machine is mainly used in the cutting and punching of steel plate.Due to the laser cutting machine cutting system needs to make fast round and forth movement on the machine,under the action of large acceleration and inertia force,the parts of the cutting system produce vibration,thus it affects the accuracy and effect of laser cutting.Using the finite element method technology,modal and transient analysis are performed to the the laser cutting machine crossbeam.The modal characteristics and the transient dynamic response in the process of acceleration and deceleration are researched.The laser cutting machine crossbeam is optimized and improved.On the premise of reducing the weight of the crossbeam by 16%,the natural frequency of the crossbeam is effectively increased,the first-order natural frequency is increased by 21%,and the amplitude of the crossbeam in the process of acceleration and deceleration movement is reduced,the combined amplitude of the crossbeam in three directions is reduced by 34.9%.Thus the efficiency and cutting accuracy of laser cutting machines are effectively improved,and the performance of products are enhanced.