The Force Of The Linear Guide

- Jul 10, 2017-

The linear guide can be understood as a rolling guide, which is an endless rolling cycle between the slider and the rail, so that the load platform moves easily along the guide rail with high precision and reduces the coefficient of friction to the usual conventional sliding guide Cited one-fifth, can easily achieve a high positioning accuracy. Between the slider and the rails between the end of the unit design, so that the linear guide at the same time bear the upper and lower left and right and other directions of the load.

Slider - Moves the movement from a curve to a straight line. The new rail system allows the machine to obtain rapid traverse speed, in the case of the same spindle speed, rapid feed is a linear guide characteristics. The linear guide, like the planar guide, has two basic elements; one is a fixed element and the other is a moving element. As the linear guide is a standard part, for the machine tool factory. Linear Rail The only thing to do is to process the parallelism of the plane of the mounting rail and the calibration rail. Of course, in order to ensure the accuracy of the machine, the bed or column a small amount of scraping research is essential, in most cases, Linear Rail the installation is relatively simple. As a guide rail for the hardened steel, after grinding placed on the installation plane. Compared with the plane guide, the linear guide cross-section of the geometric shape, complex than the flat guide, the complex reason is because the rails need to be processed out of the groove to facilitate the sliding element movement, groove shape and quantity, depending on the machine to complete Function. For example: a not only bear the linear force, but also to withstand the subversion of the rail system, and only bear the linear force of the guide rail. Linear Rail The design is very different.

Linear guide system of the fixed element (rail) the basic function of the bearing ring, the installation of steel ball bracket, the shape of "v" shape. The brackets wrap the top and sides of the guide rails. In order to support the working parts of the machine, a set of linear guides has at least four brackets. Used to support large parts of the work, the number of stents can be more than four.

When the working parts of the machine are moving, the ball is circulated in the support groove, and the wear of the bracket is spread over the steel balls, thereby extending the service life of the linear guide. In order to eliminate the gap between the bracket and the guide rail, the preload can improve the stability of the rail system and obtain the preload. Is installed between the rail and the bracket super-size steel ball. Linear Rail Ball diameter tolerance of ± 20 microns, in 0.5 micron increments, the ball filter classification, respectively, mounted on the rail, the size of the preload, depending on the role of the ball in the force. If the role of the ball on the force is too large, to withstand the preload time is too long, resulting in increased movement resistance of the stent, there will be a balance problem; in order to improve the system sensitivity, reduce movement resistance, corresponding to reduce the preload , And in order to improve the movement accuracy and accuracy of the maintainability, requires sufficient pre-negative, which is two contradictions.

Working time is too long, the ball began to wear, Linear Rail the role of the ball in the preload load began to weaken, resulting in machine tool parts movement accuracy reduction. If you want to maintain the initial accuracy, you must replace the rail bracket, or even replace the rail. If the rail system has been preloaded. System accuracy has been lost, the only way is to replace the rolling element.

The design of the rail system is designed to maximize the contact area between the fixed element and the moving element, which not only improves the carrying capacity of the system, but also allows the system to withstand the impact of intermittent or gravitational cutting, The area of force. In order to achieve this, the groove system groove shape has a variety of, there are two representative, one called Gothic (pointed arch), the shape is a semi-circular extension, the contact point for the vertex; another Kind of arc shape, the same can play the same role. No matter what kind of structure, the purpose of only one, and strive to more rolling ball radius and guide rail contact (fixed element). The factors that determine the performance characteristics of the system are: how the rolling element contacts the rails, which is the key to the problem.

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