The difference between flat bed CNC lathe and slant bed CNC lathe

The plane of the two guide rails of the flat bed CNC lathe is parallel to the ground plane. The plane of the two guide rails of the inclined bed CNC lathe intersects with the ground plane to form an inclined plane, with angles of 30°, 45°, 60°, and 75°. Viewed from the side of the machine tool, the bed of a flat-bed CNC lathe is square, while the bed of an inclined-bed CNC lathe is in a right-angled triangle shape. Obviously, with the same guide rail width, the X-direction carriage of the inclined bed is longer than that of the flat bed. The practical significance of its application in lathes is that more tool positions can be arranged.

Processing accuracy comparison:

The transmission screw of the CNC lathe is a high-precision ball Black 6-32 Nylon Machine Screws. The transmission gap between the screw and the nut is very small, but it does not mean that there is no gap. As long as there is a gap, when the screw moves in one direction, it will then drive in the opposite direction. When working, backlash will inevitably occur, which will affect the repetitive positioning accuracy of the CNC lathe, thereby affecting the machining accuracy. The layout of the inclined bed CNC lathe can directly affect the clearance of the ball screw in the X direction. Gravity directly acts on the axial direction of the screw, making the backlash during transmission almost zero. The X-direction lead screw of a flat-bed CNC lathe is not affected by axial gravity, and the gap cannot be eliminated directly. This is the inherent precision advantage that the design brings to the inclined bed CNC lathe.

Cutting rigidity comparison:

The cross-sectional area of a CNC lathe with an inclined bed is larger than that of a flat bed of the same specification, which means it has stronger bending and torsion resistance. The cutting tool of a slant bed CNC lathe cuts downwards at an angle above the workpiece. The cnc cutting force is basically consistent with the direction of gravity of the workpiece, so the spindle runs relatively smoothly and is less likely to cause cutting vibration. On the other hand, when a flat bed CNC lathe is cutting, the tool and the direction of gravity are basically consistent. The cutting force generated by the workpiece is at 90° to the gravity of the workpiece, which can easily cause vibration.

Comparison of automatic production:

The increase in the number of machine tools and the configuration of automatic chip conveyors actually lay the foundation for automated production. One person taking care of multiple machine tools has always been the direction of machine tool development. The inclined bed CNC lathe is equipped with a milling power head, an automatic feeding machine or a manipulator, automatic loading, completes all chip cutting Vacuum Stirring Sealing Plug processes in one clamping, automatic unloading, and automatic chip removal, and it becomes an automatic CNC lathe with the highest work efficiency. The structure of the flat bed CNC lathe is at a disadvantage in automated production. Although inclined bed CNC lathes are more advanced than flat bed CNC lathes, they still lag far behind. The advantages of flat bed CNC lathes such as ease of production account for more than 90% of the advantages of CNC lathes.

Comparison of chip removal capabilities:

Due to gravity, inclined bed CNC lathes are less likely to produce winding tools, which is conducive to chip removal; at the same time, combined with the central screw and guide rail protective sheet metal, it can prevent chips from accumulating on the screw and guide rails. Slant bed CNC lathes are generally equipped with automatic chip conveyors, which can automatically remove chips and increase the effective working time of workers. The structure of the flat bed makes it difficult to install an automatic chip conveyor.