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Centre lathe and turning techniques
Published in Roger Timings, Engineering Fundamentals, 2007
This can be achieved by the use of a lubricant containing an extreme pressure additive. Such additives are usually sulphur or chlorine compounds. These additives tend to build up a non-metallic film on the surfaces of the tool and the chip. Since metal is not then in contact with metal chip welding cannot take place. Unfortunately active sulphur compounds attack copper and its alloys and should not be used on such metals. The use of non-metallic cutting tools such as tungsten carbide also helps to reduce the opportunity for a built-up edge to form.
Polybutenes
Published in Leslie R. Rudnick, Synthetics, Mineral Oils, and Bio-Based Lubricants, 2020
Maryann Casserino, Yves Lambert, Anthony Simoens
Neat oils or soluble oils are suitable for applications where the loads between the die or tool and the metal being worked on are light; high-viscosity oils are preferred as these loads increase. In very demanding or severe operations, it is normal to include an extreme-pressure additive in the oil. For example, fatty acid, fatty alcohol, or glycerin additives might be chosen, with sulfurized oils, chlorinated compounds, phosphates, or borates being reserved for the most severe operating conditions.
Effect of Laser Surface Texturing on the Tribological Properties and Scuffing Mechanism of CKS Piston Ring Against Cast Iron Cylinder Liner Under High Intensifying
Published in Tribology Transactions, 2022
Xiaoguang Han, Guangchong Chen, Dong He, Yingchun Shan, Jiujun Xu
A reciprocating friction and wear test rig was used in the experiment to evaluate the tribology properties of the CLPR system (Fig. 1). A piezoelectric sensor-controlled load is perpendicularly imposed to the friction pair surface, and the signal for friction force is collected in real time by a YE 5850T01 charge amplifier and USB 6008 acquisition card. The reciprocating stroke of the test rig was 30 mm with a rotating speed range of 5–3000 r/min (the maximum linear speed is 0.008–4.725 m/s), and the applied pressure load ranged from 0 to 380 MPa while the temperature ranged from 25 to 300 °C.The lubricating oil is supplied quantitatively by peristaltic pump. Formulated lube oil RP-4652D containing the extreme pressure additive zinc dialkyldithiosulfate (ZDDP) was selected as the lubricant. The surface texture on the piston rings were fabricated by a YAG pulse laser, which has a wavelength of 1064 nm with pulse width of 1 ms (22).
Tribological and Lubrication Performances of Nano-WO3 and CaWO4 Contained in Water-Based Fluid for Steel Strip during Hot Forming
Published in Tribology Transactions, 2022
T309 (3 g), an extreme-pressure additive; γ-(2,3-epoxypropoxy) propyl trimethoxy silane (0.8 g), a coupling reagent; polyethylene glycol (2 g) and dodecyl alcohol ester (2 g), dispersants; imidazoline (0.3 g), a corrosion additive; and ethyl oleate (0.4 g), an oiliness agent, were added to deionized water (85 g), with stirring and heating to 80 °C for 20 min. In the stirring process, dodecyl alcohol ester (2 g) as a dispersant, sodium carboxymethylcellulose (0.03 g) as a thickener agent, and nanoparticle powder (CaWO4 and WO3) with various concentrations were also slowly added. After stirring, polyether (0.05 g) as a defoaming agent and polyoxyethylene octyl phenol ether (2 g) as an emulsifier were added to the solution and stirred at room temperature for 10 min. Dispersion stability of the nanofluids was evaluated by the absorbance method. The absorbances of the above nanofluids were recorded and analyzed every 15 h by a UV-2600 ultraviolet-visible spectrophotometer.