双色球后区计算公式

FFB model

  • Post Date:  Aug 8,2011
  • Expiry Date:  Aug 23,2011
  • Price Terms:  
  • Pachaging:  
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Description

precision ball screw assembly
Ball screw assembly is consisted of screw, nut and ball. The function is transfer the rotary motion into linear motion or transfer the linear motion into rotary motion. This is further extension and development of slide ball screw. The important significance of development is as same as change of bearing from rolling motion to sliding motion. Because of excellent friction function, ball screw is widely used for all kinds of industrial equipments and precision instrument. Especially in recent years, as linear motion function machine parts, ball screw is widely used in machine tools. It promotes the CNC development of machine tools thoroughly. These depend on following characteristics:

high transfer efficiency
balls with free motion transfer the force and motion between screw and nut in the ball screw assembly. This transfer wise replaces the traditional direct function wise between screw and nut. Therefore the minimum rolling friction takes the place of the sliding friction of traditional ball screw. The transfer efficiency of ball screw will reach more than 90%. The drive torque of transfer unit reduces to 1/3 of sliding screw. This reduces the heating largely.
high positioning accuracy
Ball screw has low heat rate and small temperature increase. In the machining the measures have been taken to prolong and preload so as to avoid axial clearance. Ball screw has high positioning accuracy and repeating positioning accuracy.
reversibility
Ball screw has not sticky friction like sliding screw. It clears crawl which exist during transference. Ball screw can realize two transfer wise—from rotary motion to linear motion and from linear motion to rotary motion—and transfer momentum.
long service life
Because of strict control of shape of running track, surface hardness and material, the actual life of ball screw is much longer than sliding screw.
good synchronization
due to smooth running, avoidance of axial clearance and consistency of manufacture, several sets of ball screw can drive same unit or several same parts. The synchronization is good.

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双色球后区计算公式