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361results about How to "Reduce coefficient of friction" patented technology

Lubricating and cooling method for cutting process and device thereof

The invention discloses a lubricating and cooling method for cutting process and a device thereof. The method comprises the following steps: adding nano-particles with particle size of 20-40 nm at a volume ratio of 1-5% into vegetable oil or deionized water; adding dispersant at a volume ratio of 0.05-0.15% while conducting ultrasonic vibration at a frequency of 10-40 kHz so as to obtain uniform oil-based or water-based nano-particle suspension with high dispersibility; and under the effect of compressed air with pressure of 0.3-1 MPa, sufficiently atomizing the nano-particle suspension into atomized particles with micron-level diameter, wherein the high-pressure atomized particles break through a cutter through a nozzle and an air barrier layer on the workpiece surface and then are ejected to a cutting area so as to lubricate and cool the cutting area. Through the lubricating and cooling method for cutting process and the device thereof which are disclosed by the invention, the cooling medium with high lubricating performance and heat conducting performance can be effectively injected into the cutting area so as to improve the lubricating state of the cutting area and reduce friction and heat emission; and the generated heat is taking away in real time.
Owner:CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY

Method for preparing composite anti-friction and anti-wear additive of graphene-loaded nanoparticles

InactiveCN104017628AReduce coefficient of frictionImprove anti-wear performanceAdditivesSolventControllability
The invention discloses a method for preparing a composite anti-friction and anti-wear additive of graphene-loaded nanoparticles. The method comprises the following steps: carrying out ultrasonic dispersion on expanded graphite, nanoparticles and a solvent in an ultrasonic emulsification disperser to obtain an evenly mixed dispersion system A; putting the dispersion system A into an ultrasonic cell crusher to carry out ultrasonic stripping treatment, stripping the expanded graphite into multi-layer graphene sheets by ultrasonic action, and loading the multi-layer graphene sheets and the nanoparticles to obtain a dispersion system B after ultrasonic stripping is ended; standing and separating the dispersion system B, taking out a black troubled liquor at the lower part to carry out high-speed centrifugal separation, and washing the separated solid into neutral property, so as to obtain a solid C; putting the solid C into a vacuum drying oven to dry, so as to obtain the composite anti-friction and anti-wear additive of the graphene-loaded nanoparticles. The method disclosed by the invention is simple and convenient, simple in process, strong in controllability, and applicable to industrial production; the prepared composite anti-friction and anti-wear additive has the characteristics of good stability, low friction coefficient, excellent abrasion resistance and the like, and has a broad application prospect in the field of frictional wear.
Owner:ACADEMY OF ARMORED FORCES ENG PLA

Ceramet containing Ni-Cr binder and preparation thereof

The invention relates to cermet containing a Ni-Cr binding agent, belonging to cermet material and aiming at leading the high temperature oxidation resistance of the cermet to be improved. The cermet is made by that TiC, TiN, WC, Mo, Cr3C2, Ni, Cr and powdered graphite are conducted with ball milling mixing, press molding, vacuum degreasing and vacuum sintering; the weight percentage of the compositions are as follows: Ti is more than or equal to 33 and less than or equal to 49, W is more than or equal to 4 and less than or equal to 9, Mo is more than or equal to 11 and less than or equal to 17, Ni is more than or equal to 12 and less than or equal to 34, Cr is more than or equal to 4 and less than or equal to 10.5, C is more than or equal to 7.5 and less than or equal to 11, and N is more than or equal to 2 and less than or equal to 3. The method of the invention comprises the following steps of ball milling mixing, press molding, vacuum degreasing and vacuum sintering. The cermet has good rigidity, red hardness, wear resistance, oxidation resistance, thermal shock resistance and adhesive resistance in hot environment as well as low friction coefficient, and can be used for manufacturing high-speed high-efficiency cutting tools, copper profile hot extrusion dies and parts with heat resistance, corrosion resistance and wear resistance.
Owner:HUAZHONG UNIV OF SCI & TECH

TiZrAlSiON nano composite superhard coating cutter and preparation method thereof

The invention relates to a TiZrAlSiON nano composite superhard coating cutter and a preparation method thereof, belonging to the technical field of thin-film materials. The coating cutter comprises a hard alloy cutter body, wherein a TiZrAlSiON nano composite coating is plated on the cutter body; the TiZrAlSiON coating comprises a 50-100nm-thick metal base layer-Zr metal layer, a 100-200nm-thick nitride transition layer ZrN and a 1000-4000nm-thick functional layer TiZrAlSiON; and the nano composite coating has a nano composite structure in which nanocrystal particles are embedded in the amorphous matrix, the nanoparticles comprise TiN and ZrN, and the amorphous matrix comprises Al2O3 and Si3N4. The preparation method comprises the following steps: carrying out glow cleaning on the hard alloy cutter, carrying out arc ion bombardment, and sequentially depositing the base metal layer, transition metal nitride layer and TiZrAlSiON coating. The TiZrAlSiON composite coating has the advantages of high hardness, low friction factor, high toughness, high binding force and excellent high-temperature oxidation resistance, has better comprehensive properties than the TiN, CrN and Ti-Al-N coatings which are industrially produced at present, and can effectively enhance the toughness and cutting characteristic of the cutting tool and prolong the service life of the hard alloy cutter body.
Owner:东莞市鑫硕机械科技有限公司

Technical device for reducing negative frictional resistance on driven cast-in-place pile, and application method thereof

The invention relates to a technical device for reducing negative frictional resistance on a driven cast-in-place pile, and an application method thereof. The device is characterized in that a dual-layer steel sleeve is arranged outside of a pile mould, the inner sleeve and the outer sleeve are connected by using a holder and are fixed below a vibratory hammer, and a cylindrical dual-layer plastic thin film is arranged between the inner sleeve and the outer sleeve and is fixed on an annular prefabricated concrete block by using a buckle arranged on ends of the thin film, wherein the annular prefabricated concrete block is arranged on the lower portion of the dual-layer steel sleeve. According to the invention, the dual-layer steel sleeve along with the plastic thin film within the dual-layer steel sleeve and the annular prefabricated block is sunk to a predesigned depth in static pressure or vibration manner, the steel sleeve is pulled out of the ground after concrete poured by the driven cast-in-place pile has a certain strength, while the dual-layer plastic thin film and the annular prefabricated block are left in the foundation, so that frictional factor of a pile-soil interface above the neutral point of the pile body is reduced, damages caused by the negative frictional resistance on the pile foundation are eliminated, bearing capacity of the pile foundation is improved, at the same time forming quality on the upper portion of the pile body is controlled. The device has a convenient implementation, low cost, and good pile-forming assistance effect.
Owner:HOHAI UNIV
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