STEP-NC控制器及其刀轨规划方法研究

为实现产品模型数据交换标准-数控程序在传统数控机床上的应用，提出了产品模型数据交换标准-数控程序的刀轨规划方法。首先，概述了产品模型数据交换标准-数控程序控制器的类型及其3大核心功能模块，分析和研究了刀轨规划过程中坐标系转换问题，给出了利用产品模型数据交换标准-数控程序实体索引映射表规划加工特征刀轨的方法和步骤，着重分析了平面和型腔两个加工特征的加工策略，并基于上述方法给出了具体的规划方法流程图。最后，结合一个基于平面、孔和型腔3个加工特征的产品模型数据交换标准-数控程序实例，将所规划出的G代码程序在配备开放式数控系统HITCNC的3轴数控铣床上进行实际加工，实验结果证明，该刀轨规划方法是正确可行的，并具有一定的通用性。

STEP-NC controller & its toolpath planning method

To achieve the application of STandardized for the Exchange of Product model data-Numerical Control(STEP-NC) in conventional Numerical Control(NC) machine tool,the toolpath planning method based on STEP-NC was proposed.Firstly,types of STEP-NC controllers and its three most important function modules were summarized.Then,the coordinate system transformation in the process of toolpath planning was analyzed,while the method and the procedure of machining feature toolpath planning using STEP-NC entity-index map were also presented.Machining strategies of the two machining features of both planar-face,and pocket were analyzed in particular.Furthermore,the concrete flow charts of the two machining features toolpath planning based on STEP-NC entity-index map were described.Finally,in a STEP-NC program example based on the three machining features of planar-face,hole,and pocket,the G-code program planned by STEP-NC controller was machined in the three-dimensional milling machine equipped with open Computer Numerical Control(CNC) system HITCNC.Experiment results demonstrated that the proposed toolpath planning method based on STEP-NC was feasible and could be applied in larger scale.