What is the difference between inclined bed CNC lathe and flat bed CNC lathe?
Machine layout comparison
The plane of the two guide rails of the flat bed CNC lathe is parallel to the ground plane. The plane where the two guide rails of the inclined bed CNC lathe intersects with the ground plane, forming an inclined plane, with angles of 30°, 45°, 60°, and 75°. Viewed from the side of the machine tool, the bed of the flat bed CNC lathe is square, and the bed of the inclined bed CNC lathe is a right triangle. Obviously, in the case of the same guide rail width, the X-direction carriage of the inclined bed is longer than that of the flat bed, and the practical significance of applying it to the lathe is that more tool positions can be arranged.
Cutting Rigidity Comparison
The cross-sectional area of the inclined bed CNC lathe is larger than that of the flat bed of the same specification, that is, the bending and torsion resistance is stronger. The tool of the inclined bed CNC lathe cuts downwards on the oblique top of the workpiece, and the cutting force is basically consistent with the gravity direction of the workpiece, so the spindle runs relatively smoothly, which is not easy to cause cutting vibration. When the flat bed CNC lathe is cutting, the tool and the The cutting force generated by the workpiece is 90° to the gravity of the workpiece, which is easy to cause vibration.
Machining accuracy comparison
The transmission screw of the CNC lathe is a high-precision ball screw. 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 be reversed. When there is a backlash, it is inevitable that there will be a backlash, and the backlash will affect the repeat 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, and the gravity directly acts on the axial direction of the screw, so that the backlash during transmission is almost zero. The X-direction screw of the 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 CNC lathe with inclined bed.
Comparison of Chip Removal Capability
Due to the gravity, the CNC lathe with inclined bed is not easy to produce winding tools, which is good for chip removal; at the same time, it cooperates with the central screw and guide rail to protect the sheet metal, which can avoid the accumulation of chips on the screw and guide rail. Slanted bed CNC lathes are generally equipped with an automatic chip removal machine, which can automatically remove chips and increase the effective working time of workers. The structure of the flat bed is difficult to add an automatic chip removal machine.
Automatic production comparison
The increase in the number of machine tools and the configuration of the automatic chip conveyor are actually laying the foundation for automated production. One person guarding multiple machine tools has always been the development direction of machine tools. Slanted bed CNC lathes are equipped with milling power heads, automatic feeding machine tools or manipulators, automatic loading, one-time clamping to complete all chip cutting processes, automatic blanking, and automatic chip removal, and become an automatic CNC lathe with high work efficiency. The structure of the flat bed CNC lathe is at a disadvantage in automated production. Although the CNC lathe with inclined bed is more advanced than the CNC lathe with flat bed, its market share is far behind. The advantages of flat bed CNC lathes, such as easy production, occupy more than 90% of the market share of CNC lathes
