The rigidity of large cnc machining directly affects productivity and machining accuracy, the greater the rigidity of the machine, the higher the dynamic accuracy, but how to judge the rigidity of CNCNC machining center? Shenzhen cnc machining factory collated some of the content for reference.
First, the choice of cross-section shape and size
For the same shape of the cross-section, in the case of maintaining the same cross-sectional area, the preferred form of wall thickness is small, the size of the cross-sectional profile is large. The rigidity of the closed section is greater than the rigidity of the non-closed section. A hole in the wall reduces the rigidity, while the bending stiffness is restored by adding a flange around the hole.
Second, the selection and configuration of the spacer and reinforcing rib
Reasonable arrangement of support spacers and ribs can improve the stiffness of the member, for longitudinal, horizontal and diagonal ribbed plate, the role of cross-ribbed plate is best; for some thin-walled members, the honeycomb reinforced ribs are better.
Third, to improve the local rigidity of the components
Machine tool guide and bracket connection parts are mostly weak local rigidity, but the connection method has a greater impact on the local rigidity.
Fourth, the choice of welded structure of the components
cnc machining center bed, pillars and other support parts from steel plates and sections welded together, with the significant advantages of reducing weight and improving rigidity. The modulus of elasticity of steel is about twice that of cast iron, with steel plate welding can make the member form a fully enclosed box structure, which is conducive to improving the stiffness of the member.