High speed, high efficiency, high precision, high efficiency and high energy saving are the eternal pursuit of the hardware processing industry in the 21st century, and it will also be a long pursuit in the future. Because the ball screw is a machine tool accessory that can meet the above requirements, it has been widely used in the automotive industry, optoelectronic engineering, instrumentation, mold manufacturing, and even aerospace.
To achieve high-speed machining, the machine tool must have both a high-speed feed system and a high-speed spindle system to achieve high-speed machining of various materials to be processed. In order to achieve this goal, improving the performance of the ball screw is one of the main measures. The specific measures are as follows:
First: The mechanism of the ball screw is improved, and its flow is improved. The specific method is to optimize the ball ring reverse device, improve the curve parameters of the ball return groove, use a three-dimensional modeling ball guide tube and a ball return device to make the ball ring move in the direction of the lead angle of the internal thread, and introduce the ball into the nut to make The direction of the circle movement is tangent to the fairway instead of intersecting. This makes collision loss and noise smaller.
Second: For the large-stroke high-speed feed system, the ball screw can be driven by a fixed screw and a rotating nut. At this time, the nut rotates while moving axially along the fixed screw. Since the screw does not move, it can avoid being restricted by the critical speed, thereby avoiding various problems that occur when the slender ball screw is running at high speed. The screw cap has small moment of inertia, flexible movement and high speed.
Third: The use of "hollow strong cold" technology avoids the influence of high temperature caused by friction on the deformation of the club. The method is to pass a constant temperature cutting fluid into the hole of the hollow screw rod, and force the ball screw to cool, so that the temperature of the ball pair remains unchanged. This method improves the high-speed performance and machining accuracy of medium and large ball screws.
Fourth: In order to improve the stiffness and load-bearing capacity of the ball screw, the ball screw should be appropriately enlarged. In order to increase the effective bearing number of the ball, the large lead ball screw generally adopts a double-threaded thread. Speed, lead and number of thread heads.
