1. To ensure the processing quality of the plate and frame filter press. When the parts are roughed, a large amount of metal will be removed, so a large cutting force and cutting heat will occur, and a large clamping force is also required. In these Under the action of force and heat, the parts will be greatly deformed. And the internal stress of the parts after the rough machining of the filter press will be redistributed, which will also cause the parts to deform. And correct the machining errors caused by the above reasons. After distinguishing the processing stage, the errors formed by rough machining can be corrected through semi-finishing and finishing, and gradually improve the machining accuracy and surface quality of the parts, ensuring the machining requirements of the parts.

2. The need for rational use of machine tools. Rough machining generally requires the selection of machine tools with high power, good rigidity, high productivity and low precision. For finishing, machine tools with high precision need to be selected, which can be fully utilized after distinguishing the processing stages. The characteristics of the respective performances of the roughing and finishing equipment can prevent the use of rough and fine equipment, so that the equipment can be used reasonably. This not only improves the production efficiency of roughing, but also helps to maintain the accuracy and service life of the finishing equipment.

3. Find the defects of the blank of the plate and frame filter press in time. Various defects on the blank (such as pores, sand holes, slag inclusion or insufficient machining allowance, etc.) can be found after rough processing, which is convenient for timely repair or decision to scrap, In order to avoid waste of working hours and processing costs after continuous processing.

4. It is easy to organize heat treatment. The heat treatment process distinguishes the processing process into several stages. For example, the fine spindle is subjected to artificial aging treatment to remove stress after rough machining, quenching treatment after semi-finishing, and low-temperature tempering and severe cold treatment after finishing. , and then perform finishing processing. These heat treatments divide the entire processing process into roughing-semi-finishing-finishing-finishing processing stages.