Hiwin HG Series Linear Rails

When the working parts of the machine tool using micro linear guides move, the steel balls circulate in the groove of the support, distributing the wear of the support to each steel ball, thereby extending the service life of the linear guide. 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 preloading It is to install oversized steel balls between the guide rail and the bracket. The diameter tolerance of the steel ball is ± 20 microns, with increments of 0.5 microns. The steel balls are sorted and installed on the guide rail separately. 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 the preload for too long, resulting in an increase in the resistance of the bracket movement. There is a balancing issue here; In order to improve the sensitivity of the system and reduce motion resistance, it is necessary to reduce the preload accordingly. However, in order to improve motion accuracy and accuracy retention, sufficient preload negative numbers are required, which are contradictory aspects. The design of the guide rail system strives for a large contact area between the fixed and moving components, which not only improves the system's load-bearing capacity, but also enables the system to withstand the impact force generated by intermittent cutting or gravity cutting, spreading the force widely and expanding the load-bearing area. In order to achieve this, there are various groove shapes for the guide rail system, with two representative ones. One is called the Gothic (pointed arch), which is an extension of a semicircle with the contact point as the vertex; Another type is the circular arc shape, which can also serve the same purpose. Regardless of the structural form, the goal is only one, to strive for more rolling steel ball radius to contact the guide rail (fixed element).

The factor that determines the performance characteristics of the system is how the rolling elements contact the guide rail, which is the key to the problem. Strive for a larger contact area between fixed and moving components, which not only improves the system's load-bearing capacity, but also enables the system to withstand the impact force generated by intermittent cutting or gravity cutting, spreading the force widely and expanding the load-bearing area. In order to achieve this, there are various groove shapes for the guide rail system, with two representative ones. One is called the Gothic (pointed arch), which is an extension of a semicircle with the contact point as the vertex; Another type is circular arc shape, which can also serve the same purpose.

HG Series,Linear Rails