Axle pin

The quality of the central roller is the leading level in the industry, and its temperature is higher than that of the bed. The thermal deformation of the ball screw will increase the lead and damage the accuracy. In order to compensate for thermal deformation, the ball screw can be pre stretched. The pretension should be slightly larger than the thermal deformation. After scalding, the thermal deformation is equal to a part of pretension, which reduces the tensile stress in the ball screw, but the length is not changed. When the ball screw to be pre stretched is manufactured, its strategic schedule (the length of part of the external thread at normal temperature) shall be equivalent to the nominal pressure schedule (the basic theoretical length of part of the external thread is equivalent to the nominal pressure lead multiplied by the number of external thread turns on the ball screw) minus the pre stretched amount. Repair the nominal pressure stroke arrangement value after pulling. The amount deducted is referred to as "trip compensation value".

Torque mode, including double nut gasket torque, double nut tooth difference torque, double nut external thread torque, single nut deflection guide torque, single nut expanding bearing ball torque, etc. The size of the R & D torque force of the central roller can be carried forward by 1 / 3 of the larger radial load; when the larger radial load cannot be carried forward, the additional load can be 1 / 20-1 / 10. Large radial load: the transmission force of the large planetary roller ball screw pair when the equipment accepts the large load, which is the sum of the radial force of the cutting speed on the large planetary roller ball screw and the sliding friction of the slide rail (at this time, the sliding friction of the slide rail is caused by the total net weight of the operating platform, steel parts and tooling clamps and the weight of the cutting speed in the vertical slide rail direction.) After pre drawing (i.e. applying for torque force), the radial clearance can be removed, and the rigidity of the ball screw pair of the large planetary roller can reduce the ductility deformation between the ball body, the ball screw and the nut, so as to achieve higher precision.