The comparison of slant bed CNC lathe and flat bed CNC lathe

- Sep 02, 2019-

A3 CAK series flat bed CNC lathe we generally called economic CNC lathe, and A1 HTC series slant bed CNC lathe we generally called universal CNC lathe or full-function CNC lathe.

The flat bed CNC lathe is reformed from the CNC system of the ordinary lathe, The consideration of automation is not comprehensive. The slant bed CNC lathe is developed and designed according to the principle of CNC machining, very targeted, In the layout of the machine, rigidity, accuracy, and chip removal capacity, Compared with the flat bed CNC lathe has been significantly improved.

Here's a partial comparison:


1. Comparison of machine layout

The plane of the two guide ways of the flat bed CNC lathe is parallel to the ground plane. The plane of the two guide ways of the slant bed CNC lathe intersects with the ground plane, making a slant plane, Angles are 30 degrees, 45 degrees, 60 degrees, 75 degrees.

From the side of the machine, the bed of the flat CNC lathe  is square.

The bed of slant bed CNC lathe is a right triangle. Obviously, with the same guide width, The X - to - drag plate of slant bed is longer than that of flat bed, The practical meaning of applying in lathe is to arrange more tool positions.

2. Cutting rigidity contrast

The cross-sectional area of the slant CNC lathe  bed is larger than that of the flat bed with the same specification. More resistance to bending and torsion.

The cutting tool of the slant CNC lathe is cutting from the top of the workpiece. The cutting force is basically consistent with the gravity direction of the workpiece, So the spindle runs relatively smoothly, Not easy to cause cutting vibration, While the flat bed CNC lathe in cutting, The cutting force generated by the cutter and the workpiece is 90° with the workpiece gravity, liable to vibration.


3. Comparison of machining accuracy of machine tools

The driving screw of CNC lathe is high precision ball screw, The transmission clearance between screw and nut is very small, But that doesn't mean there aren't gaps. And as long as there's a gap, When the screw moves in one direction and then moves in the opposite direction, the reverse gap will inevitably occur, There is a reverse clearance will affect the repeated positioning precision of CNC lathe, thereby affecting the machining accuracy.

The layout of slant CNC lathe can directly affect the clearance of ball screw in X direction. Gravity acts directly on the axial direction of the screw, So that the transmission of the reverse clearance is almost zero. The X - direction screw rod of the flat bed CNC lathe is not affected by axial gravity. Gaps cannot be eliminated directly. This is the design of slant bed CNC lathe to bring inherent precision advantage.


4. Comparison of chip removal capacity

Due to the gravity of the inclined CNC lathe bed is not easy to produce winding tool, conducive to chip removal. At the same time with the middle screw and guide way protective cover, can avoid chip accumulation on the screw and guide way. Slant bed CNC lathes are generally equipped with automatic chip machine, can automatically remove chips, Increase the effective working hours of workers. Flat bed structure is difficult to add automatic chip removal machine.


5. Automatic production comparison

Slant bed CNC lathes are usually equipped with 8 or 12 station tool holder. The flat bed of the CNC lathe is generally equipped with a 4 - position tool holder. Increase of machine tool position number, Configuration of automatic chip removing machine. It's really all about laying the groundwork for automated production. One man on duty for many machines, has been the direction of the development of machine. Slant bed CNC lathe and add C axis function and milling power head, automatic feeding machine or manipulator, Automatic feeding, one - time clamping to complete all the chip process, Automatic cutting, automatic chip removal, has become the work efficiency extremely high automatic CNC lathe. The structure of flat bed CNC lathe is at a disadvantage in automatic production.