CNC machine tool castings

The main function of CNC machine tool castings is to support the spindle box and meet the Z-direction movement of the spindle box.Machine tool column castings should have good rigidity and thermal stability.In the design phase,acceptance analysis of machine tool column castings is carried out through machine tool dynamics.The casting of the machine tool column is an A-shaped structure,which eliminates the displacement and swing caused by the machine tool column casting during the machining process,making the load-bearing capacity of the machine tool workbench 2-3 times that of other machine tools.Excellent design and casting process.The weight of machine tool column castings accounts for a large proportion of the total weight of the machine tool,and also accounts for a considerable proportion of the total cost of the machine tool.It is necessary to use as few materials as possible to achieve high rigidity.

Design characteristics of CNC machine tool castings:

1.Reasonable structural degree and combination of reinforcement ribs can improve the torsional resistance and rigidity of CNC machine bed castings;

2.In order to ensure good static stiffness of CNC machine tool bed castings,attention should be paid to the reasonable selection of the structural form of machine tool column castings.The machine tool column castings adopt a closed complete box structure,and the machine tool column castings adopt a closed section.Reasonable selection and layout of partitions and ribs should be made to minimize the joint surface and improve the indirect contact stiffness of components.The longitudinal partition mainly improves the bending stiffness of machine tool column castings;The transverse partition mainly improves the torsional stiffness of machine tool column castings;The diagonal partition has the effect of improving the bending and torsional stiffness of machine tool column castings.

Factors affecting the quality of CNC machine tool castings:

There are many factors that affect the quality of CNC machine tool castings,which are the design process of the castings.When designing the body castings of CNC machine tools,in addition to determining the geometric shape and size of the castings based on working conditions and metal material properties,the rationality of the design should also be considered from the perspective of casting alloys and casting process characteristics of CNC machine tool crossbeams,that is,obvious dimensional effects and solidification,shrinkage,stress and other issues,in order to avoid or reduce the occurrence of defects such as component segregation,deformation,and cracking in copper castings.There should be a reasonable casting process.Based on the structure,weight,and size of the casting,the characteristics of the casting alloy,and production conditions,suitable parting surfaces,shapes,and core making methods are selected,and casting ribs,cold iron,risers,and pouring systems are reasonably set.CNC machine tool crossbeam to obtain castings.The third is the quality of the raw materials used for casting.The substandard quality of metal furnace materials,refractory materials,fuels,fluxes,detergents,casting sand,molding sand binders,coatings and other materials for CNC machine tool crossbeams can cause defects such as slag inclusion and sand sticking in castings,affecting the appearance and internal quality of castings.In severe cases,it can lead to the scrapping of castings.The fourth is process operation,which requires the development of reasonable process operation regulations to improve the technical level of workers and ensure the correct implementation of process regulations.