How to improve the stability of guide rail system

When the working parts of the machine tool move, the steel balls will circulate in the support groove, and the wear of the support will be allocated to each steel ball, so as to prolong the service life of the linear guide rail. In order to eliminate the gap between the bracket and the guide rail, preloading can improve the stability of the guide rail system and obtain the preload It is to install oversized steel balls between the guide rail and the support. The diameter tolerance of the steel ball is ± 20 microns. The steel balls are screened and classified in increments of 0.5 microns and installed on the guide rail respectively. The size of the preload depends on the force acting on the steel ball. If the force acting on the steel ball is too large, the steel ball will withstand preloading for too long, resulting in increased resistance to support movement. There is a problem of balance here; In order to improve the sensitivity of the system and reduce the motion resistance, it is necessary to reduce the preload accordingly. In order to improve the motion accuracy and accuracy retention, it is required to have enough preload negative numbers, which are two contradictory aspects. The design of the guide rail system strives to maximize the contact area between fixed components and moving components, which can not only improve the bearing capacity of the system, but also withstand the impact force generated by intermittent cutting or gravity cutting, widely spread the force and expand the bearing area
In order to achieve this, the groove shapes of the guide rail system are diverse, and there are two representative ones. One is called the Godot type (pointed arch type), whose shape is the extension of the half circle, and the contact point is the vertex; The other is circular arc, which can also play the same role. No matter which structural form, there is only one purpose, and strive to make more rolling ball radius contact with the guide rail (fixed elements)
The factor that determines the performance characteristics of the system is how the rolling element contacts the guide rail, which is the key to the problem. Strive to have the maximum contact area between fixed components and mobile components, which can not only improve the bearing capacity of the system, but also the system can withstand the impact force generated by intermittent cutting or gravity cutting, widely spread the force and expand the bearing area. In order to achieve this, the groove shapes of the guide rail system are diverse, and there are two representative ones. One is called the Godot type (pointed arch type), whose shape is the extension of a semicircle, and the contact point is the vertex; The other is circular arc, which can also play the same role.