Abstract: Aiming at the poor universality of current NC tube bending process simulation methods,a forming process simulation approach of NC tube bending was presented based on kinematics model.According to the kinematics theory of multi-body system,information model and kinematics model were established to describe the movement and structural parameters of the bending machines.Newton-Raphson iteration method was used to solve the kinematics equations.By the motion planning method of the bending machine and the target tube,the NC tube bending simulation of any structural single-head bending machine was implemented.A prototype system was developed,and the bending machines of SWING and VB200HP were used as examples to validate the proposed approach.

Key words: numerical control tube bending, mechanisms, kinematics model, modeling, simulations

摘要： 针对现有数控弯管加工过程仿真方法通用性差的问题,提出一种基于机构运动学模型的数控弯管加工过程仿真方法。在运用多体系统运动学理论对数控弯管机进行机构运动学分析的基础上,建立了描述数控弯管机运动特征和结构参数的信息模型及机构运动学模型,采用Newton-Raphson迭代法对数控弯管机机构运动学方程进行求解,给出了数控弯管机运动和导管动态成形的运动规划算法,实现了任意结构单头数控弯管机的加工过程仿真。最后开发了原型系统,以SWING和VB200HP两种数控弯管机为例对所提方法进行了验证。

关键词: 数控弯管, 机构, 运动学模型, 建模, 仿真