Filter press machining process is composed of one or several of gradate process. Each process can be divided into one or several working steps, feeding, installation and location, etc.

(1) process. Belt type filter process refers to one or a set of the operator, in a work place or on a machine tool, in the same or a few parts for processing at the same time for completion of that part of the process. To determine whether a series of processing content belong to the same process, the key lies in whether the processing content in the same location for the same workpiece by successive completion. As long as the operator, work place or machine tools, machining object is one of the three changes or not for completion, it is not a process. The same parts, and the same processing content can be arranged in different process is complete.

Process is an essential part of the machining process, and to determine the task time, equipped with workers, arrange work plan and basic unit of quality inspection, etc.

(2) step. More is to point to in the same process of bag filter, when the processing surface is constant, the cutting tool is constant, cutting parameter under the condition of feeding and cutting speed constant of the finish that part of the process. When a worker step after changing any of the factors, becomes a new step. A process can only include a step, also can include a few steps. In mechanical processing, sometimes with a few different cutting tool and machining a worker on the surface of the parts of a few steps, called composite work step. For example, to improve the efficiency of production, with a combination milling cutter in milling machine milling plane, can be regarded as a composite work step.