In the process of large-scale machining production, those processes that are directly related to the transformation of raw materials into products are called process processes, which effectively include blank manufacturing, parts processing, heat treatment, quality inspection and machine assembly to a certain extent. In order to ensure the normal process of the process, the manufacturing of tools and fixtures, and the adjustment and maintenance of machine tools are auxiliary processes.
Large scale machining technicians need to determine the process to be adopted during operation according to the quantity of their products, equipment conditions and the quality of workers, and will write the relevant content into process documents, which are called process regulations. In order to facilitate the preparation, execution and production organization management of process regulations, it is necessary to divide the process into different levels of units.
Large scale machining is the process, installation, station, step and pass. The process is the basic unit in the process. The machining process of parts consists of several processes. A process may include one or several installations, each installation may include one or several stations, each station may include one or several steps, and each step may include one or several passes .