(1) to ensure the processing quality of plate and frame filter press needs.Parts in rough machining, because to cut off a lot of metal, so will produce greater cutting force and cutting heat, but also need a greater clamping force, in the action of these forces and heat, parts will produce greater deformation.And after rough machining parts to redistribute the internal stress, will also make parts deformation.It is impossible to avoid and correct the machining errors caused by the above reasons if continuous machining is carried out without dividing the machining stages.After dividing the processing stage, the errors caused by rough machining can be corrected by semi-finishing and finishing, and gradually improve the machining precision and surface quality of parts, ensuring the processing requirements of parts.

(2) rational use of machine tool equipment needs.Rough machining generally requires the use of large power, good rigidity, high productivity and not high precision machine tools.But the finishing needs to use the high precision machine tool equipment, after the division of the processing stage can give full play to the characteristics of the performance of the coarse, finishing equipment, avoid the rough dry fine, reasonable use of equipment.This not only improves the production efficiency of rough machining, but also helps to maintain the precision and service life of finishing equipment.

Timely find the blank defects of the plate frame filter press.All kinds of defects on the blank (such as porosity, sand, slag or processing allowance is insufficient) can be found after rough processing, which is convenient for timely repair or decide whether to scrap, so as to avoid the waste of working hours and processing costs caused by continued processing.

It is convenient to arrange heat treatment.The heat treatment process divides the machining process into several stages, such as the manual aging treatment for stress removal after the rough machining of the precision spindle, the quenching treatment after the semi-finished machining, the low-temperature tempering and cold treatment after the finished machining, and the finishing treatment after the light finishing treatment.These heat treatments divide the whole process into rough - semi - finishing - finishing - finishing stages.