The bed of the control mechanism is the basic support for the entire machine. It is generally used to place important parts such as guide rails and headstocks. To meet the machining accuracy of CNC machine tools. There are higher requirements for the bed of CNC machine tools:
There are a lot of machined surfaces for mounting components and guide surfaces for moving parts on the bed. These surfaces have high precision and mutual positional accuracy, and they must be kept for a long time.
For CNC machine tools, thermal stability is an outstanding problem. It is necessary to make the thermal deformation of the whole machine small, or to make the influence of thermal deformation on the machining accuracy small.
To meet the requirements of the bed of CNC machine tools, the bed of CNC machine tools adopts the overall structure. Using the gray cast iron, artificial granite, steel plate welded parts and other materials. To guarantee the precision of the lathe, WMTCNC always uses the casting bed.
Depending on the type of CNC machine, the structure of the bed has a variety of forms. The bed structure of the CNC milling machine and machining center has two types: fixed column and mobile column. The former is generally adapted to small and medium-sized vertical or horizontal machining centers, while the latter is further divided into an overall T-shaped bed and a T-shaped bed assembled separately from the front and rear beds. The T-shaped bed means that the bed consists of a transverse front bed (also called a horizontal bed) and a rear bed (also called a vertical bed) perpendicular thereto. The integral bed structure has a closed box-shaped structure and a high rigidity.
The structure of the CNC machine bed is generally a box structure. The reasonable arrangement of the ribs of the bed can improve the static stiffness. The longitudinal ribs can improve the bending and torsional rigidity of the column, and the effect of improving the torsional stiffness is more remarkable. Diagonally inclined ribs and diagonally intersecting ribs are more effective in increasing the stiffness of the columns. The bed section of the CNC lathe can improve the chip evacuation conditions. At the same time, the cross-sectional shape adopts a closed box structure, thereby increasing the outer contour size of the bed section, so that the bed body has high bending and torsional rigidity.