Machine tool castings includes bed, the work table, column, Longmen top, connecting beam. Materials are high quality fine grey cast iron HT200-HT300, precision ratio, higher tensile bending strength, international popular heat treatment process, so that the casting stress deformation is reduced to the minimum degree. Influence of machine tool casting quality factor many, is the first large-scale machine tool casting process of design. Design, in addition to the credential things conditions and metal materials function to determine machine tool castings geometry, size, also must from casting alloy and casting properties of angle consideration design is reasonable, the apparent size effect and agglutination, shrinkage, stress and other issues, in order to avoid or reduce the cast copper pieces identity segregation, deformation, cracking defect generation. Second must have the reasonable casting process. Which credentials casting layout, component and size, casting alloy properties and production conditions, choice of parting surface and modeling, core making method, to set a reasonable casting bars, cold iron, riser and gating system. In order to guarantee the quality of castings. Third is the casting of raw material quality. Metal materials, refractory materials, fuel, flux, modifier and foundry sand, sand binder, coating quality standard quality, will make the castings have holes, pinholes, slag, burn-on defect on casting surface quality, and external quality, tension will make the casting scrap. Fourth is the process control, to develop a reasonable process control procedures, progress the skills of workers, so that the process of losing the right to execute.
Machine casting coating process skills required:
By 1, after machining castings, before painting must use metal cleaning agent or clean industry gasoline for leaching and washing, ensure the complete removal of surface oil dirt and other contaminants.
In 2, the lathe bed lathe bed casting coating before the inspection, the surface irregularities to use tool for trimming, the dirt on the surface to be cleared.
3, increase casting sag atomic ash according to products using that adding proper amount of curing agent, using the former must fully mixing evenly.
In 4, the last to putty sanding liquidation after cleaning, necessary spraying vinyl second primer, so can improve the film flatness, progress film gloss.
