Comparison of machine layout

 

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 the ground plane and forms 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. The practical significance of the application in 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 ability to resist bending and torsion is stronger. The cutting tool of the inclined bed CNC lathe cuts down from the upper part of the workpiece, and the cutting force is basically the same as the gravity direction of the workpiece. Therefore, the spindle runs relatively smoothly and is not easy to cause cutting vibration. When the flat bed CNC lathe is cutting, the tool is The cutting force generated by the workpiece is 90° with the gravity of the workpiece, which is easy to cause vibration

 

Comparison of machining 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 does not mean that there is no gap. As long as there is a gap, when the screw moves in one direction, it will drive in the reverse direction. It is inevitable that there will be a backlash, which 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 gap of the ball screw in the X direction. 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 the 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.

 

Comparison of chip removal ability

 

Due to gravity, the inclined bed CNC lathe is not easy to produce winding tools, which is conducive to chip removal; at the same time, with the center screw and guide rail to protect the sheet metal, it 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. It is difficult to add an automatic chip conveyor to the structure of a flat bed.

 

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 on duty for 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 tool or a manipulator, which automatically feeds materials, completes all the chip cutting procedures in one clamping, automatic blanking, and automatic chip removal. It becomes an automatic CNC lathe with extremely high work efficiency. The structure of the flat bed CNC lathe is at a disadvantage in terms of automated production. Although the inclined bed CNC lathe is more advanced than the flat bed CNC lathe, the 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.