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The Positioning Accuracy Of Linear Guideway Is Very High Sep 14, 2017




Linear Guide, also known as Line rail, slide, linear rail, liner slide

, for linear reciprocating motion occasions, with a higher rated load than linear bearings, but also to bear a certain torque, can be high load conditions to achieve high-precision linear motion.

The function of the linear Motion Guide is to support and guide the moving parts, and to do the reciprocating linear motion in the given direction. Linear Rail According to the nature of friction, linear motion guide can be divided into sliding rails, rolling friction rails, flexible friction rails, fluid friction rails and other types.

Linear bearings are mainly used in automation machinery more, such as German imports of machine tools, paper bowls, laser welding machine, and so on, of course, Linear Rail linear bearings and linear shaft is a matching use. Like linear guideway is mainly used in the high precision mechanical structure,

Slider-Moves the motion from a curve to a straight line. The new guideway system enables the machine tool to obtain the fast feed speed, in the case of the same spindle speed, the fast feed is the characteristic of the linear guide. The linear guide is like a planar guide, with two basic elements, Linear Rail one as a fixed element and the other a moving component. Because the linear guide is a standard part, the Machine tool factory. The only way to do this is to process the parallelism of the plane and alignment rails of a mounting rail. Of course, in order to ensure the accuracy of the machine, a small amount of bed or column scraping research is essential, in most cases, Linear Rail the installation is relatively simple.

As a guide guide rail for hardened steel, after fine grinding placed on the installation plane. Compared with the plane guide, the geometric shape of the cross section of the Linear guide rail is more complicated than the plane guide, because it is necessary to process the groove on the guideway to facilitate the movement of the sliding element, Linear Rail the shape and quantity of the groove, depending on the function of the machine. For example: a rail system that bears both a linear force and an overturning moment, compared to a guideway that only bears a straight line force. There is a big difference in design.

There is no intermediate medium between the moving element and the fixed element of the linear guide, and the rolling steel ball is used. Because the rolling steel ball adapts to the high speed movement, Linear Rail the friction coefficient is small, the sensitivity is high, satisfies the movement component the work request, such as the machine tool turret, the towing board and so on. The basic function of the fixed element (Guide rail) of the linear guideway system is like the bearing ring, the bracket of the steel ball, and the shape "V". The bracket wraps the top and two sides of the guide rail. In order to support the working parts of the machine tool, a linear guideway has at least four brackets. Linear Rail For supporting large working parts, the number of stents can be more than four.

When moving the working parts of the machine tool, the steel ball circulates in the bracket groove, and the wear amount of the bracket is distributed to each steel ball, thus prolonging the service life of the linear guideway. In order to eliminate the gap between the bracket and the guide rail, Linear Rail preload can improve the stability of the rail system, preload load. Is to install a super size steel ball between the guide rail and the bracket. Steel ball diameter tolerance of ± 20 microns, with 0.5 microns as the increment, the steel Ball screening classification, respectively loaded on the guide rail, preload the size of the load, Linear Rail depending on the action on the Steel Ball force. If the force acting on the steel ball is too large, the steel ball withstands the preload time too long, which leads to the increase of the support movement resistance. Here there is a balance of the problem; In order to improve the sensitivity of the system, reduce the movement resistance, and correspondingly to reduce the preload load, and in order to improve the movement accuracy and accuracy of the maintenance, it is necessary to have enough pre plus negative, Linear Rail this is a contradiction in two aspects.

What are the advantages of the linear guide

First, its positioning accuracy is very high, when using linear Guide as a linear guidance, because the linear guide is rolling friction rolling mode, friction coefficient reduced to the sliding guidance of 1/50, the dynamic friction is similar to static friction, so as to prevent the bed skid phenomenon.

Second, because the dynamic friction is almost equal to static friction, Linear Rail rolling friction way to make the wear smaller, which is the machine can be a long time to maintain the accuracy.

Third, we all know that the friction of the principle of heat, because the linear guide of the friction has become smaller, thermal energy is not high, can be applied to high-speed operation.

The correct choice of linear guide rail, is to ensure product quality of the first choice. Of course, Linear Rail linear Guide in the use of lubricating oil is also relatively large, so be sure to ensure sufficient lubricants, so as to play the greatest role.