What is the difference between a slant bed CNC lathe and a flat bed CNC lathe?
Comparison of machine tool layout:
The plane where the two guide rails of the flat bed CNC lathe are parallel to the ground plane. The plane of the two guide rails of the CNC lathe on the inclined bed intersects the ground plane and forms an inclined plane with angles of 30 °, 45 °, 60 ° and 75 °. 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 rail width, the X-direction carriage of the inclined bed is longer than that of the flat bed. The practical significance of the application on the lathe is that more knife positions can be arranged.
Cutting rigidity comparison:
The cross-sectional area of the CNC lathe of the inclined bed is larger than that of the flat bed of the same specification, that is, it has stronger resistance to bending and torsion. The tool of the inclined lathe CNC lathe is cut diagonally above the workpiece. The cutting force is basically the same as the gravity direction of the workpiece, so the spindle runs relatively smoothly, and it is not easy to cause cutting vibration. When the flat bed CNC lathe is cutting, the tool and The cutting force generated by the workpiece is 90 ° to the gravity of the workpiece, which easily causes vibration.
Comparison of processing accuracy:
The drive 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 is not to say that there is no gap. As long as there is a gap, when the screw moves in one direction, the drive is reversed. It is inevitable that there will be a backlash. If there is a backlash, it will affect the repeated positioning accuracy of the CNC lathe, which will affect the machining accuracy. The layout of the CNC lathe of the inclined bed can directly affect the clearance of the ball screw in the X direction, and gravity directly acts on the axial direction of the screw, so that the reverse clearance during transmission is almost zero. The X-direction screw of the flat bed CNC lathe is not affected by the axial gravity, and the gap cannot be eliminated directly. This is the innate accuracy advantage that the design brings to the inclined bed CNC lathe.
Comparison of chip removal capacity:
Due to the relationship of gravity, the CNC lathe on the inclined bed is not easy to produce winding tools, which is conducive to chip removal. At the same time, it cooperates with the central screw and guide rail protection sheet metal, which can avoid the accumulation of chips on the screw and guide rail. 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 is difficult to install an automatic chip conveyor.
Automatic production comparison:
The increase in the number of machine tools and the configuration of automatic chip conveyors are actually laying the foundation for automated production. One person on duty for multiple machine tools has always been the direction of machine tool development. Inclined bed CNC lathes are equipped with milling power heads, automatic feeding machine tools or manipulators, which can automatically load and complete all chipping procedures in one clamping, automatic cutting, automatic chip removal, and become an automatic CNC lathe with extremely high work efficiency. The structure of the flat bed CNC lathe is at a disadvantage in automated production. Although the slant bed CNC lathe is more advanced than the flat bed CNC lathe, its market share is far behind. The advantages of easy production of flat bed CNC lathes occupy more than 90% of the market share of CNC lathes.