Performance characteristics of large CNC lathes

The CNC lathe mainly consists of a bed, spindle box, spindle box base, main motor and motor base, chuck, middle frame, tailstock, tool rest, hydraulic system, electrical system and CNC system, cooling system, functional components and random accessories.

1. Bed and carriage:

latheThe surface of the bed is cast with high-strength resin sand. After medium-frequency quenching, the surface hardness of the bed is HRC45-55. After annealing, the deformation and internal stress caused by thermal expansion and contraction during casting are completely eliminated, and the vibration during cutting can also be dispersed. The depth of medium-frequency quenching is deep, which is conducive to secondary regrinding of the lathe. The lathe bed has strong rigidity, large load-bearing capacity and good stability. The mop is scraped with glue. Since the material contains lubricating elements, the difference in dynamic and static friction coefficients is very small. Together with lubricating oil, the friction between the drag plate and the guide surface of the bed is greatly reduced, preventing crawling. The lathe bed is cast with arched doors for front and rear chip removal, and the chips are discharged directly into the chip collecting tray for easy chip removal and cleaning.

2. Pressure head box:

The spindle adopts a three-point support, with the front end as the fixed end, the middle and rear ends as the movable end, the front and rear ends as the main support, and the middle as the auxiliary support. The front end is set with axial positioning so that the spindle is stretched backwards after being heated, eliminating the impact of the spindle thermal elongation on the accuracy of the lathe; the main transmission of the bedside is driven by a variable frequency motor, and the gear has no step; the spindle system has good rigidity, strong load-bearing capacity, stable rotation, and high precision. The main spindle box is lubricated by strong oil, and the main spindle box gears and bearings are lubricated by a special oil pump. The front end of the spindle adopts a labyrinth-type and cog-type double closed structure, which can effectively prevent oil leakage and foreign matter from entering the spindle box.

3.Tools:

Standard vertical 4-station electric turret, 300mm across sides, strong rigidity.

4. x, z axis:

Driven by servo motor and precise reducer. The x-axis transmission is a ball screw, the diameter of the x-axis ball screw is 40x5, and the diameter of the z-axis transmission is 80x10. The ball screw has two sets of special angular contact ball bearings, supported by a reasonable combination.

5. Tailstock:

The lathe tailstock is a manual structure with sufficient load-bearing capacity. The movement of the tailstock is pulled by the trailer, which makes the tailstock move longitudinally, conveniently and happily. The tailstock is composed of an upper body and a lower body. The tailstock sleeve, the tailstock sleeve moving mechanism and the main shaft adjustment mechanism are installed in the tailstock. Sleeve locking is manual. In order to prevent sliding between the bed end and the bed body when supporting the workpiece, a support rod is installed on the tailstock.