What are the structural characteristics of CNC machine tool bed?

NC machine tool body refers to the mechanical structure entity of NC machine tool. Compared with the traditional common machine tool, it is also composed of main transmission mechanism, feed transmission mechanism, workbench, lathe bed and column, but the overall layout, appearance modeling, transmission mechanism, tool system and operating mechanism of CNC machine tools have changed greatly. The purpose of this change is to adapt to the requirements of CNC technology and give full play to the characteristics of CNC machine tools.

Machine tool host is the main body of CNC machine tools. It comprises a lathe bed, a base, an upright post, a cross beam, a sliding seat, a workbench, a spindle box, a feeding mechanism, a tool rest and an automatic tool changing device. It is a mechanical part that automatically completes all kinds of cutting processing on CNC machine tools. Compared with traditional machine tools, the main body of CNC machine tools has the following structural characteristics:

1. Adopt a new machine tool structure with high rigidity, high earthquake resistance and small thermal deformation. Usually, methods such as improving the static stiffness of structural system, increasing damping and adjusting the mass and natural frequency of structural parts are used to improve the stiffness and seismic capacity of machine tool body, so that the machine tool body can meet the needs of continuous automatic cutting of CNC machine tools. The influence of thermal deformation on the main engine can be reduced by improving the structural layout of machine tools, reducing heating, controlling temperature rise and adopting thermal displacement compensation.

2. The wide application of high-performance spindle servo drive and feed servo drive device shortens the transmission chain of CNC machine tools and simplifies the structure of mechanical transmission system of machine tools.

3. Adopt transmission devices and moving parts with high transmission efficiency, high precision and no clearance, such as ball screw nut pair, plastic sliding guide rail, linear rolling guide rail and hydrostatic guide rail.