The main difference between the ball screw and the trapezoidal screw is that between the moving surface the support bearing way. Ball screw using recirculating balls bearing to minimize friction and improve efficiency, while trapezoidal screw will have to apply low friction coefficient between the sliding surface. Thus, the trapezoidal screw generally can not reach the ball screw efficiency. Simple analysis can be found: sliding friction predictability certainly less than the use of recirculating balls technology transmission. Fatigue life equation within its scope of application is very reliable. Through the above review, trapezoidal screw and ball screw due to the predictability and lifetime existence of differences, so the application category also have the basic difference.
Although the ball screw compared to trapezoidal screw has many advantages (load, stiffness, efficiency, duty cycle, predictability), but its cost is higher. Although compared to other linear motion translation program, their cost-performance are very high, but the ball screw designs more complex, requirement of the fine bearing surface after the disposal of hardened and a ball cycle installation. The trapezoidal screw small dimensions, the design is very sensitive, the situation in the correct use of very little noise, good corrosion resistance, it is possible to meet the needs of vertical applications and configure the self-locking function. They play an important role in many application areas, of course, also has its own limitations.
The advantages of ball screw replace trapezoidal screw
1, No backlash, high rigidity: ball screw assembly can be added the pre-pressure, due to the axial clearance can achieve negative values, then get a higher rigidity.
2, Micro feed potential: because the ball movement is the ball movement, the starting torque is very small, and there will be no creeping phenomenon of the sliding motion, and can ensure the accurate micro feed.
3, Compared with the sliding screw the driving torque is 1/3: because there are a lot of ball rolling motion between the screw shaft and ball screw nut, it is possible to obtain a high efficiency of movement. Compared with the past sliding screw assembly the driving torque reaches 1/3 below, the power required for achieving the same results is 1/3 of the rolling screw. It's helpful in saving energy.
4, High speed feed potential: ball screw due to the high movement efficiency, low heat, it is possible to achieve high-speed feeding. Ball screw in the nut part structure of a unique feature.
5, High accuracy guarantee: ball screw is consistent production by made in Japan the world's highest level of machinery and equipment. Especially in the grinding, assembly, inspection of the process plant environment, temperature and humidity were strictly controlled, because the perfect quality management system so that accuracy can be fully guaranteed.
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