Notifications
The feed transmission of automated transfer machine is the direct object of digital control, no matter the point control or contour control, the final coordinate accuracy and contour accuracy of the workpiece are affected by the transmission accuracy, sensitivity and stability of the feed transmission. For this reason, the feed system of automated transfer machine generally has the following characteristics.
Low friction resistance
In order to improve the fast response performance and motion accuracy of the automated transfer machine feed system, it is necessary to reduce the friction resistance and the difference of dynamic and static friction force between the moving parts. In order to meet the above requirements, in the automated transfer machine feed system, the ball screw screw nut pair, static pressure screw nut pair, rolling guide rail, static pressure guide rail and plastic guide rail are generally used. At the same time, the moving parts are also considered to have appropriate damping to ensure the stability of the system.
High transmission accuracy and stiffness
The transmission accuracy and stiffness of the feed transmission system, from the perspective of mechanical structure, mainly depends on the transmission clearance and the precision and stiffness of the screw nut pair, the worm gear pair and its supporting structure. The transmission clearance mainly comes from the transmission gear pair, worm gear pair, screw nut pair and their supporting parts, so the feed transmission system is widely used to apply preload or other measures to eliminate the clearance. Shortening the transmission chain and setting reduction gear in the transmission chain can also improve the transmission accuracy. Increasing the diameter of the lead screw and applying preload force to the screw nut pair, supporting parts and the lead screw itself are effective measures to improve the transmission stiffness.
The inertia of moving parts is small
The inertia of the moving parts has an effect on the starting and braking characteristics of the servomechanism, especially when the parts are running at high speed. Therefore, under the premise of meeting the strength and stiffness of the parts, the mass of the moving parts is reduced as much as possible, and the diameter and mass of the rotating parts are reduced to reduce the inertia of the moving parts.
Zero clearance
In order to improve the displacement accuracy and reduce the transmission error, we must first improve the accuracy of various mechanical parts, and then try to eliminate various gaps, such as; Coupling, gear pair, ball screw pair and their supporting parts are adopted to eliminate the gap structure.
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