The Study On SoftCNC Of Open NC System

Soft-CNC research is the most important part of the research work of open NC system, which became the research hotspot of NC technology. This paper mainly introduces how to realize the functions of CNC, including translation of NC codes to the system, tools compensation and interpolation. In this paper, open NC system is based on SERCOS interface while software is programmed with VC++6.0 on Windows NT operating system, which is embedded with RTX. In addition, a shared memory is created for the communication between two processes and a thread is created for the multitasks.There are there main tasks of soft-CNC. The first task is translating NC codes to the system. The second is data processing. And the third is interpolation. In order to translate NC codes to the system, three parts of compilation is needed. The first part is to parse the accidence of words, the second part is to analyze the grammar of sentences, and the third part is to translate. This paper introduces a simple method of translation according to the feature of NC codes. And this paper can realize the function of tools compensation after carefully analyze the different joining conditions of lines or arcs. In addition, the paper can fulfill the function of interpolation, which is very important in the research of soft-CNC. Besides the function of a plane linear or arc interpolation, it can realize the linear or arc interpolation on any plane in the space. At last, it is tested on a three-coordinate milling machine. Soft-CNC can realize the functions of CNC in high performance and high speed CNC system. With its great advantages, it will be widely used in many fields.