The influence of solid lubricant particle size on machining parameters in turning
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Keywords:
Metal working
Dry lubricant
Metal working
Cutting tool
Dry lubricant
Dry friction
Lubricity
Contact area
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Dry lubricant
Thermogravimetric analysis
Thermal Stability
Gravimetric analysis
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Dry lubricant
Particle (ecology)
Suspension
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This paper discusses the goal and task of reform of metalworking practice. It produces a new teaching mode of metal working practice .It explains the thinking of reform of metalworking practice and puts forward a set of imp1ementation strategies.
Metal working
Metal working
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It is difficult to use an ordinary plain bearing under a high load or at a high friction speed because lubricant oil is pushed out from the friction surface or deterioration of the lubricant oil is caused by heat of friction. A solid lubricant, MoS2, is promising in such condition. When the lubricant is dispersed in a matrix, the solid lubricant is always supplied from the matrix. Such a composite bearing needs a back metal to maintain its shape. The heat of friction may cause a crack between the bearing and the back metal due to thermal stress. A bearing with low coefficient of friction is necessary to decrease the heat of friction, and an FGM structure is also promising to decrease the stress. The aim of this experiment is to fabricate and to examine friction properties of the composites. Cu was plated on the lubricant particles by electroless deposition. The lubricant volume fraction (hereafter Vf) was up to Vf 30 %. The Cu plated lubricant particles were hot-pressed to form a composite at 873 K under 30 MPa in a vacuum. Friction properties of the composites were determined by using a ball-on-disk type testing machine. The test was performed in the air without oil at room temperature. The solid lubricant in the composites was effective to decrease the coefficients of friction under a high load when the Vf was higher than 20 %.
Dry lubricant
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SOLID lubricants such as molybdenum disulphide and graphite have been incorporated in bonded lubricating films for some years, but work is constantly proceeding to develop improved products that provide reduced friction, less wear, are easier to use, or have other valuable features. One of the more recent additions to this type of lubricant is graphite fluoride.
Dry lubricant
Molybdenum disulfide
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This study was carried out to see if solid-lubricant films on metal surfaces wear monotonically, or if there is occasional migration from a region on the wear track with copious lubricant to one from which the lubricant has been worn away. To facilitate this study, a new pin-on-disk apparatus was constructed with the capability of continuously measuring the friction and the exoelectron emission from tile wear track. Sliding tests were carried out using a circular wear track which, initially, traversed a path partly on an unlubricated surface and partly on a surface covered by a solid-lubricant film. It was found that lubricant films of rubbed graphite and molybdenum disulfide showed no spreading of the lubricant along the wear track, but polytetrafluoroethylene had some capability for migration and, hence, healing of a denuded wear track.
Dry lubricant
Exoelectron emission
Molybdenum disulfide
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Bearing with solid lubricant embedded is a new type of sliding material.Special lubricant bolts are embedded into metal matrix.Combined with the toughness of metal and antifriction of solid lubricant,these bearings have been successfully applied in many tough working environments such as heavy loading,low running velocity,high temperature?submerged etc.Discuss the working principle,design method?producing process and characteristics of this excellent bearing material.
Dry lubricant
Metal working
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Dry lubricant
Matrix (chemical analysis)
Volume fraction
Solid surface
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Optimized bonded solid lubricant technology depends on lubricant formulation and application. Using a ring/block test rig bonded solid lubricants were investigated containing molybdenum disulfide, graphite and antimony-thioantimonate. For evaluating the tribological properties wear life depending on speed and load as well as wear rate resulting in wear coefficients were measured. In addition the friction behaviour was determined. Optimum solid lubricant concentrations of two component lubricants containing MoS2/graphite or MoS2/Sb(SbS4) resulted in remarkable improved tribological properties compared with single component formulations. Antimony-thioantimonate possessing no usable tribological properties at all can improve these properties of other solid lubricants. Therefore a new three component lubricant containing optimum concentrations of MoS2, graphite and Sb(SbS4) was developed exhibiting much better lubricating properties than single and two component formulations as well as commercially available bonded solid lubricants. Regarding application technology the influence of running-in was investigated because certain bonded solid lubricant films need such a process in order to obtain maximum wear life curves. For these investigations that time was defined as completion of the running-in process after which no further change of the coefficient of friction occurs for the given speed and load conditions. It was found that this running-in process was completed after different time periods for different lubricants. Obviously the influence of the running-in process on wear life is the result of the smoothing and compressing of the lubricant film depending on its film formation properties.
Dry lubricant
Molybdenum disulfide
Lubricity
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