In the field of industrial machinery, ball screw is an indispensable key component and is widely used in various precision equipment. However, have you noticed an interesting phenomenon: most ball rods rarely travel more than 2 meters? Today, we'll explore the reasons behind this issue.

1. Structure and function of ball wire rod

A ball wire rod is a mechanical device that transforms a rotational motion into a linear motion, consisting of wire rods, nuts, and balls. It has the advantages of high precision, high efficiency, long life, widely used in CNC machine tools, industrial robots, precision instruments and other fields. Its working principle is to realize the relative movement through the ball rolling between the wire rod and the nut, so as to complete the conversion of linear movement.

2. The reason of the travel limitation of the ball wire rod

(1) Rigid reduction and bending deformation

When the travel of the ball rod is too long, the length of the rod increases and its rigidity will decrease significantly. It is like a slender stick that bends easily when it is long enough. In the process of bearing the load and operation, if the rigidity is insufficient, it is easy to bend and deformation, which will affect its transmission accuracy and service life, and even lead to equipment failure in serious cases.

(2) The slender ratio limit

The elongation ratio of the rod is a key parameter, defined as the ratio of the rod length to the diameter.(The length and diameter of the wire rod = value <60) Generally, the elongation ratio is less than 60. If this value is exceeded, the ball wire rod will droop under its own gravity, resulting in deviation. This offset will destroy the straightness of the straight line module, making the equipment unable to achieve accurate linear movement, thus affecting the machining accuracy and product quality.

(3) Operation jitter and middle sinking

The increase in stroke will also make the slender ratio of the silk rod too large, which is easy to cause running jitter. Jitter will make the equipment operation unstable, produce noise, reduce the machining accuracy and surface quality. In addition, the span growth may also lead to the middle sinking of the wire rod, which will further affect its precision performance and make the equipment unable to work properly.

3. countermeasures

A common solution for trips over 2 meters is to add an auxiliary slider. The auxiliary slider can provide additional support for the rod, enhance the stability of the structure, and effectively prevent the middle sinking and bending deformation of the rod, thus improving the overall accuracy and performance. By reasonably arranging the position and number of the auxiliary slider, the ball screw can still work stably and accurately in a long stroke.

4. sum up

The ball wire rod travel rarely exceeds 2 meters, mainly because of its rigidity, accuracy and stability considerations. Too long travel will lead to problems such as reduced rigidity, bending deformation, excessive slender ratio, operation jitter and intermediate sinking, thus affecting the normal operation and processing quality of the equipment. By adding auxiliary sliders and other measures, these problems can be solved to a certain extent to meet the needs of longer trips.