The characteristics of the slide guide, crawl phenomenon and adjustable

The characteristics of the slide guide, and adjustable 2018 - crawl phenomenon 08 - 08 guide rail is one of the important components of machine tool, has played a supporting and guiding component along a certain track movement. Guide the development of the traditional performance in east components and guide form first. In different kinds of guide rail, the slide guide because of simple structure, easy fabrication, good stiffness, vibration resistance higher advantages, therefore has been widely used in nc machine tools. A, the characteristics of the characteristics of the slide guide slide guide is used in between the guide rail and sliding medium, medium including solid friction materials, oil resistance, and the kinds of air, such as slide guide is divided into different types. The most common friction resistance of the guide rail is installed in the mobile component a solid friction resistant material, such as PVC or bronze mixed materials, to have the effect of lower guide rail friction. Resistance to friction material should design a tank, satisfy mobile components and lubrication between the guide rail surface or other form the need of lubrication. Is the most widely used hydraulic medium, which is the typical representative of hydrostatic guideway. Under the effect of pressure, the hydraulic oil into the groove, sliding component in the guide rail and sliding between components to form a layer of oil film, the guide rail and mobile components separated, so that we can greatly reduce the mobile component of friction, lubrication effect thereby. Hydrostatic guideway for large load movement has good lubrication effect, also has certain compensation to eccentric load. For example, a machine tool in processing a large sand box, sand box just the movement to the machine at the end of the trip, the static pressure guide rail can increase the oil pressure, to keep guide rails are still accurate horizontal load condition. Some also use this technique, horizontal boring and milling machine is used to compensate the deep hole processing when the spindle speed. Another use oil as a medium of guide rail is the dynamic pressure guide rail, the difference between it and hydrostatic guideway is that it does not use the pressure, but the use of oil viscosity to avoid direct contact with the guide rail between mobile component. This has the advantage of saving hydraulic oil pump. Air is a kind of sliding guide rail and sliding between the components commonly used medium, it also can be divided into two forms, pneumatic pressure hydrostatic guideway and move the guide rail, its working principle and hydrostatic guideway and dynamic pressure in hydraulic guide rail. Second, the crawling phenomenon produced due to the flat guide and move between components are larger contact area, so the mobile component will be quickly trace feed will need to overcome moving components of moment of inertia. When a ball screw or other driving force to promote mobile components for mobile, will produce a mild adhesive resistance. Moment you start moving components, as it is in a state of being caught, casual can appear slightly beat, lead to crawl phenomenon. Crawl phenomenon for large mobile impact is not big, but to trace mobile will cause great influence, become a problem. Three, adjustable adjustable slide guide is a straight line slide guide a unique advantage. According to the usage of guide rail, linear slide guide system is equipped with adjustable side, of one or more than one number. Since mobile component to move along the side of the linear guide, must make the pledge that we shall move components and guide on the side of close contact, so guide to have adjustable function. Adjustment method is the most commonly used puts oblique iron mobile components and guide rail contact surface between the side of the relative. The shape of the oblique iron principle the taper Angle iron. If the sliding parts or guide rail wear, the contact surface between the generation gap, can by adjusting the Angle iron, to compensate the precise guide rail, eliminate the gap between the moving parts and the guide rail. Machine tool manufacturers have developed oblique iron automatically adjust patent technology and widely used. The basic principle of this technology is to make the Angle iron to maintain constant spring pressure, once moving parts wear or guide system, oblique iron can automatically eliminate the gap between them.