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Smooth skills: smooth rails
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Commonly used guide rail materials are cast iron, steel, plastic or composite materials coated or coated on cast iron.
1. Rail smoothing effect
1) One of the effects of the guideway smoothing agent is to make the guide rail work as close as possible to the liquid conflict state; to reduce the conflict resistance; reduce the driving power; improve the power.
2) Reduce the wear of the guide rail; prevent the guide rail from corroding. The smooth oil of the activity also has a flushing effect.
3) Prevent the appearance of sputum under low speed and heavy load; and reduce the oscillation.
4) Reduce the heat of conflict at high speed; reduce thermal deformation.
2. The selection of the smoothing oil of the machine tool guide is based on the experience and data; when selecting the smooth oil of the machine guide rail, the following elements should be considered first.
1) Smooth oil, which is used as both hydraulic medium and guide oil, is based on the requirements of different types of machine guide rails; it can be used as a guide oil for hydraulic medium; it is necessary to satisfy the requirements of the guide rail; it is also the demand of satisfactory hydraulic system. For example, for a machine tool like a coordinate boring machine; the viscosity of the rail oil (50 ° C) should be selected higher (40 ~ 90mm2 / s); but like various types of grinding machines; often the rail smooth oil is supplied by the hydraulic system; and the hydraulic system The demand is higher; it is necessary to be satisfied; at this moment, the viscosity of the guide rail-hydraulic smooth oil (50 ° C) should be selected lower (20 ~ 40 mm2 / s); that is, the viscosity required for the hydraulic system.
2) Select the viscosity according to the sliding speed and uniform pressure.
3) According to the smooth application practice of machine tool guides at home and abroad; when selecting the use of guide rail smoothing agent; also refer to the examples of the practical application of the existing motorized bed guide rails at home and abroad.
3. Hydrostatic smooth guide rails Hydrostatic smooth guides can be generally divided into open type; closed type and unloading type. The so-called open static pressure guide means that the guide rail is only placed on one side of the bed; relying on the weight and external load of the moving parts The moving parts are not separated from the bed; therefore, they can only accept one-way load; and the ability to accept the eccentric load is poor; it is suitable for the case where the load is more uniform; the eccentric load and the overturning moment are small horizontal placement. The closed static pressure guide It means that the guide rail is arranged in several directions of the bed; and several oil chambers are opened in several directions of the guide rail; the movable member can be restrained from the bed body; thus, the positive and negative loads can be accepted; the partial load and the comparative moment are accepted. The ability of the oil film is high; the oil film has high rigidity; it can be used for uneven load; when the partial load is large and there is a positive and negative load. The unloading static pressure guide has no oil film to separate the two guide surfaces; the two guide surfaces are straight touch; There are still a few active smooth oils on the two touch surfaces; the stiffness is large; the layout is simple; the touch stiffness is suitable for the required guide rails; the rail wear is also reduced; the workbench moves evenly or at low speed Unique long Machine Tool.
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