Lubrication technology: guide - bearing lubrication knowledge

Lubrication technology: the guide rail lubrication abstract: guide rail machine tool bearing guide components must be trajectory accurately moving clamping positioning function of rail track accuracy with precision directly affect the machining accuracy of machine tool, the application guide sliding guide rail rolling guide hydrostatic guideway guide cross-section shape the rectangular dovetail cylindrical flat guide materials commonly used iron inlay Shanghai juji 1 plastic composite materials. Guide rail lubricant effect liquid static pressure bearing shaft shell with shaft guide is commonly used in machine tool used for supporting and guiding parts along a certain path accurate positioning clamping movement or the function of orbit. Moving orbit accuracy and precision, directly affect the machining accuracy of machine tool. The current application of guide rail sliding guide rail, rolling guideway and hydrostatic guideway. Guide the section shape of V, rectangular, dovetail, cylindrical and plane shape, etc. Common rail material is cast iron, steel, inlays, or Shanghai juji plastic or composite on cast iron, etc. 1. Guide rail lubricant 1) Guide one of lubricant is to make the guide as far as possible close to the work under the liquid friction state, to reduce the friction resistance, reduce the driving power, improve efficiency. 2) To reduce rail wear, prevent corrosion guide rail. Flow of oil flushing effect. 3) Avoid under the low speed heavy crawl phenomenon, and to reduce vibration. 4) Reduce the friction heat, reduce the thermal deformation. 2. The choice of machine tool guideway lubrication oil according to experience and data, mainly consider the following factors when choosing machine tool guideway lubrication. 1) Do is as a guide for the hydraulic medium oil of lubricating oil according to the needs of different types of machine tool guideway, optional as guide rail lubricating oil for the hydraulic medium at the same time, should not only meet the requirements of guide rail, and meet the requirements of the hydraulic system. For example, machine tools, such as coordinate boring machine guide rail oil viscosity ( 50℃） Should choose more ( 40～90ｍｍ2／ｓ） , but like all kinds of grinding machine, often will guide rail lubricating oil supply by hydraulic system, hydraulic system and the demand is higher, must meet, guide - hydraulic oil viscosity ( 50℃） Persons to be lower ( 20～40ｍｍ2／ｓ） The viscosity, the hydraulic system. 2) According to the sliding velocity and the average pressure to select the viscosity. 3) Machine tool guideway lubrication at home and abroad based on the actual application to select, when choosing using guide lubricant, also refer to the domestic and foreign existing mobile bed guide rail lubrication examples of actual applications to choose. 3. Hydrostatic lubrication guide hydrostatic lubrication guide is usually divided into open type, closed and unloading type three categories. The so-called open hydrostatic guideway is set only on one side of the bed guide rail, depend on moving parts weight and external load keep moving parts is not out of bed separation, therefore can only carry a one-way load, and under partial load torque ability is poor, are uniformly applicable to load and partial load and overturning moment small horizontal occasions. And closed hydrostatic guideway is guiding rail set in bed a few direction, and guide in the direction of a few open several oil cavity, can restrict movement from the bed separation, therefore, can withstand the positive and reverse loading under partial load and a fu torque ability is stronger, oil film rigidity is high, can be applied to uneven load and partial load and to load the positive and negative situations. Unloading hydrostatic guideway no oil film to separate two guideway, two guide surface is in direct contact, but still in the two contact surfaces have a small amount of lubricating oil, its stiffness is larger, the structure is relatively simple, suitable for requirement of guide rail contact stiffness is bigger, at the same time to reduce rail wear, uniform table under the low speed movement or exercise a special long machine tool guideway.