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155results about How to "Low friction factor" patented technology

Production method of facial tissue capable of being wetted with water

The invention relates to a production method of a facial tissue capable of being wetted with water. The production method comprises: respectively adding water to needlebush pulp and hardwood pulp, adjusting the needlebush pulp concentration and the hardwood pulp concentration to 5.0-7.0 wt%, and crushing for 8-15 min; adjusting the needlebush pulp concentration to 4.0-5.0 wt%, and carrying out fiber cutting and fibrillation in a grinder; adding water to adjust the hardwood pulp concentration to 4.0-5.0 wt%, and carrying out fiber defibrating in a defibrating machine; mixing 50-60% of the needlebush pulp and 50-40% of the hardwood pulp, adjusting the concentration to 3.0-4.0 wt%, and carrying out further cutting and fibrillation through the grinder; adding a wet strength agent and a softener to the mixed pulp, and adjusting the concentration to 2.9-3.1 wt%; and diluting the obtained mixed pulp to 0.2-0.25 wt% by using a pulp beating pump, feeding into a papermaking machine, molding, squeezing, and drying to finally prepare the product. According to the present invention, when the prepared facial tissue used for water wiping and sweat wiping, the facial tissue is not broken, and no residue paper exists; the prepared facial tissue can be used as the wet wipe and the face washing towel after the prepared facial tissue is wetted with the water; and the hand feeling and the smoothness of the facial tissue are improved, such that the use is comfortable.
Owner:上海东冠纸业有限公司

Laser preparation method of titanium-nitride-coating-contained textured surface of titanium alloy

The invention discloses a laser preparation method of a titanium-nitride-coating-contained textured surface of titanium alloy. According to the laser preparation method of the titanium-nitride-coating-contained textured surface of the titanium alloy, firstly, surface pretreatment is conducted on the titanium alloy; and then, under the conditions of heating, temperature keeping and the N2 atmosphere, laser texturing is conducted on the surface of the titanium alloy, and meanwhile laser gas nitriding treatment is conducted. The laser gas nitriding technology and the laser surface texturing technology are combined, the titanium-nitride-coating-contained textured surface is prepared on the surface of the aluminum alloy, and the titanium-nitride-coating-contained textured surface have both the advantages of high hardness and chemical stability of the titanium nitride coating and the advantage of the small surface friction coefficient of the textured surface. The method is simple, operation is easy and convenient, the prepared surface texture is stable and controllable in dimension and free of macroscopic cracks and other defects, generated titanium nitride crystal particles are fine and uniform in distribution, and the wear resistance and corrosion resistance of the surface of the titanium alloy are greatly improved.
Owner:JINAN UNIVERSITY

Hot-pressing preparation method for hexagonal boron nitride-added silicon nitride

The invention relates to a hot-pressing preparation method for hexagonal boron nitride-added silicon nitride. The preparation method comprises the following steps: adding hexagonal boron nitride having a laminar structure as a solid lubricating agent to silicon nitride, and mixing; meanwhile, adding a sintering aid and carrying out ball grinding; pouring alcohol to adjust the viscosity of fluid; then putting the ball-ground powder to a drying oven, heating, drying by steaming and sieving; then loading the powder to a die, and pre-pressing to form a biscuit; carrying out temperature preservation and pressure preservation in a vacuum carbon tube furnace; finally, reducing the temperature of the vacuum carbon tube furnace to room temperature, and taking sintered silicon nitride composite ceramic out. According to the preparation method disclosed by the invention, boron-containing oxides and hydroxides are generated by means of a chemical reaction between the hexagonal boron nitride and water molecules, so that the siding surface of a material has a lubricating property per se, and thus the tribological property of the silicon nitride ceramic material is remarkably improved, namely the friction factor of the silicon nitride ceramic material is remarkably reduced; the silicon nitride composite ceramic produced by hot-pressing sintering has the characteristics of good self-lubricating and tribological properties and can meet the using demands in actual engineering.
Owner:SHAANXI UNIV OF SCI & TECH

Internal oblique teeth built-up crankshaft type RV speed reducer of industrial robot

The invention relates to the technical field of robot deceleration and discloses an internal oblique teeth built-up crankshaft type RV speed reducer of an industrial robot. The speed reducer comprises a left rigid disc, a right rigid disc, an internal cycloid gear ring, a cycloid wheel, an internal cycloid component of a crankshaft, and a planet component, wherein the planet component comprises a sun gear and a planet gear; the speed reducer is characterized in that a planet shaft is connected with eccentric sleeves to form a double- eccentric built-up crankshaft; a tumbler bearing is a zinc base alloy sliding bearing, a spiral oil groove is formed in the excircle of the tumbler bearing, and the axial length is 5-10 mm longer than the cycloid wheel; the eccentric sleeves are connected with a planet shaft internal inclined gear pair; an internal inclined gear ring adopts plasticity precision forming and has the phase fine tuning function; one side of a first eccentric sleeve is propped against a second elastic collar, and a spring is positioned between the other side of the first eccentric sleeve and a second elastic collar; and a second eccentric sleeve is arranged between a first elastic collar and the second elastic collar on the planet shaft. The internal oblique teeth built-up crankshaft type RV speed reducer has the following beneficial effects: assisted by the eccentric sleeves and the planet shaft internal inclined gear pair, the double- eccentric built-up crankshaft ensures phase difference precision; the zinc base alloy sliding bearing can carry out self-lubrication; and the cost is reduced by 60-75% for the general manufacturing precision.
Owner:吴小杰

Preparation method of microarc oxidation-tungsten dioxide self-lubricating composite ceramic layer

The invention discloses a preparation method of a microarc oxidation-tungsten dioxide self-lubricating composite ceramic layer. Sodium silicate, sodium hexametaphosphate, ammonium metavanadate and an anionic dispersing agent are mixed and dissolved to obtain mixed solution; thio-ammonium tungstate performs ultrasonic water bath dissolving by de-ionized water, is added with a wetting agent, and is added in the mixed solution; the ultrasonic wave and the mechanical stirring effect are synchronously applied, so that added reagents are fully dissolved and dispersed to prepare electrolyte containing WS42-; a circulating cooling water device is started; a pretreated metal sample is connected to an electric conducting rod to dip in the electrolyte as an anode; a stainless steel electrolytic cell also serves as a cathode; a microarc oxidation power supply is started for microarc oxidation; and then, the drying is performed to obtain the microarc oxidation-tungsten dioxide self-lubricating composite ceramic layer. The prepared ceramic layer is smooth in surface, uniform in thickness, high in compactness and firm in combination with a basal body, has such prominent advantages as low friction factor and wear rate and excellent self-lubricating performance, and satisfies actual application requirements.
Owner:XIAN UNIV OF TECH

Slurry chromium impregnation permeating agent slurry and chromium impregnation layer preparing method

The invention belongs to the technical field of metal impregnation, and particularly relates to a slurry chromium impregnation permeating agent slurry and chromium impregnation layer preparing method. The method is used for preparing a permeating layer capable of improving surface corrosion resistance, wear resistance and high-temperature resistance performance of a metal material product. The method comprises the steps that a protecting sleeve is used for the non-permeating-layer portion of a cleaned part for protecting, and therefore the portion cannot be coated with permeating agent slurry; the portion, required to be subject to chromium impregnation, of the part is evenly coated with the permeating agent slurry, and the thickness of a coating layer ranges form 1.5 mm to 2.0 mm; after the coating layer is dried, the part is subject to chromium impregnation in a vacuum tank under the protection atmosphere protection, in the chromium impregnation process, the heat preservation temperature ranges from 1040 DEG C to 1090 DEG C, the heat preservation time ranges from 5 h to 10 h, furnace cooling to the temperature below 300 DEG C is carried out, and during furnace cooling, the pressure is 0.5 to 1.0 time of the standard atmospheric pressure. Metallurgical bonding is achieved, it is ensured that the coating can be tightly combined with a base body and is not prone to falling off, the depth of the prepared chromium impregnation layer ranges from 0.005 mm to 0.020 mm, and the chromium impregnation surface shows the silver gray.
Owner:AECC AVIATION POWER CO LTD

Whole working condition composite-structure sliding bearing

InactiveCN110273921AImprove wear resistanceGood noise reduction and vibration reduction performanceBearing componentsCarrying capacityLow speed
The invention belongs to the technical field of sliding bearings, and discloses a whole working condition composite-structure sliding bearing. The sliding surface of the sliding bearing is provided with a triple composite texture; the three-layer composite texture comprises pit sets which are uniformly distributed in the sliding surface of the sliding bearing, and each pit set comprises a first pit, a second pit and a third pit; the first pits have the characteristics of being small in diameter and large in depth, and are suitable for the low-speed heavy-load working condition and capable of achieving the noise lowering and vibration reducing effects; the second pits have the characteristics of being large in diameter and small in depth, and is suitable for high-speed low-load working condition and capable of enabling the bearing to be in the dynamic pressure lubricating state more easily; and the third pits have the characteristics of being moderate in diameter and depth, is suitable for the medium-speed medium-high-load working condition and is used for transiting the suddenly-changed working condition within a short time and stabilizing the working state. According to the whole working condition composite-structure sliding bearing, the reasonable triple composite texture is designed on the sliding bearing, accordingly, the comprehensive performance of the sliding friction pair structure is improved, the friction coefficient and the wear rate are effectively decreased, oil film forming is accelerated, the carrying capacity and the abrasion resistance are improved, and the service life is prolonged.
Owner:TIANJIN UNIV

Preparing method for TiC matrix steel base steel bond hard alloy

The invention relates to a preparing method for a TiC matrix steel base steel bond hard alloy. The preparing method includes the following steps that titanium carbide powder and matrix steel matrix powder are weighed according to the proportion, alloy powder is put into a ball grinding machine to be mixed and smashed, added absolute ethyl alcohol is a process control agent, and the wet mixed powder is put into a vacuum drying box to be dried after ball grinding and is used for standby use after drying; an organic monomer and an initiator are added into a solvent to prepare pre-mixed liquid; an additive improving slurry fluidity and dispersity is added; a catalyst and a pH modifier are added and are evenly stirred, and slurry is obtained; and the slurry is injected into an injection and coagulation die, vacuum suction or vibration gas removing is conducted, after the slurry is cured to be formed, a blank is put into the vacuum drying box to be dried, the dried blank is subjected to integrated degumming and sintering in a vacuum sintering furnace, and the steel bond hard alloy is prepared. The preparing method has the beneficial effects that the technology is simple, the cost is relatively low, and parts large in size and complex in shape are easy to prepare on the basis that the macro performance of the steel bond hard alloy is ensured.
Owner:丹阳惠达模具材料科技有限公司

Rolling type die holder

The invention relates to the field of die holders, in particular to a rolling ball type die holder. The rolling ball type die holder comprises an upper die holder body and a lower die holder body, and is characterized in that the upper end of the upper die holder body is provided with a pressing block, two guide pillars are arranged between the upper die holder body and the lower die holder body, the upper portion of each guide pillar is sleeved with a guide sleeve, a retainer is arranged between each guide sleeve and the corresponding guide pillar, each retainer is connected with the corresponding guide pillar, rolling balls are arranged in each retainer, the side faces of the rolling balls make contact with the outer surfaces of the corresponding guide pillars and the inner surfaces of the corresponding guide sleeves, the lower ends of the rolling balls in each retainer are provided with a spring, the lower ends of the springs make contact with the upper surface of the lower die holder body, the upper ends of the springs make contact with the lower ends of the corresponding retainers, a groove is formed in the outer surface of each guide sleeve and located at the lower end of the upper die holder body, the lower end of the upper die holder body is provided with a plurality of pressing plates, each pressing plate is provided with a boss, the bosses are arranged in the grooves, and the pressing plates are connected with the upper die holder body and the lower die holder body through screws. The rolling type die holder is convenient to use and long in service life, and the guide pillars and the guide sleeves are convenient to replace.
Owner:CHANGZHOU LIWEI KNIFE

Pressure device and method for thin-walled powder metallurgy shaft sleeve

The invention provides a pressure device and method for a thin-walled powder metallurgy shaft sleeve. The device comprises a template, wherein a lower die is fixed on the template. The device is characterized in that a pressing die is fixed in the lower die; an inner hole in the pressing die is the same as the excircle of the powder metallurgy shaft sleeve; a core rod is mounted in the center of the pressing die; the excircle of the core rod is the same as an inner hole in the powder metallurgy shaft sleeve; the inner hole in the pressing die and the excircle of the core rod are combined to form a die cavity for pressing of the powder metallurgy shaft sleeve; an ejecting sleeve for pushing out the powder metallurgy shaft sleeve is arranged on the excircle of the core rod; the lower end of the ejecting sleeve is connected with an ejecting device capable of moving up and down; an upper punch connected with a punch press sliding block is arranged above the die cavity; the front end of the upper punch takes the shape of a circular tube matched with the die cavity; a powder feeding pipe for a power metallurgy material is arranged above the die cavity, and can move left and right; a material pushing plate is connected with the front end of the powder feeding pipe; when the powder feeding pipe moves to the die cavity, the material pushing plate pushes the powder metallurgy shaft sleeve to move out of a punching area; a graphite powder material is added into the power metallurgy material, and the weight of the added graphite powder material accounts for 1-2% of the total weight.
Owner:ZHEJIANG SF OILLESS BEARING

Manufacturing method for austenitic stainless steel surface modification

The invention discloses a manufacturing method for austenitic stainless steel surface modification. According to the manufacturing method, a metal material is modified through the manufacturing methodof high-pressure grinding material water jet-ionitriding composite treatment, and surface strengthening is carried out; even though the roughness of the surface of the metal material is increased after high-pressure grinding material water jet-ionitriding composite treatment is adopted, due to the fact that the surface of the treated metal material is machined and hardened, the plastic deformation resistance is improved, the hardness of the metal material is improved, a groove structure is formed on the surface, and a certain collecting function is achieved on grindings in the friction process; the friction coefficient of the metal material is kept stable all the time, and the surface has a good wear resisting and wear reducing function after being treated by the manufacturing method of high-pressure grinding material water jet-ionitriding composite treatment. The metal adopting high-pressure grinding material water jet-ionitriding composite treatment is light in wear trace, and the wear trace is uneven. The metal hardness is improved after nitriding treatment, high-hardness grindings can be generated in the in the friction process, the grindings are further refined to form grains, abrasion is increased, and therefore the friction coefficient is increased. It shows that high-pressure grinding material water jet-ionitriding composite treatment is adopted, a modified layer has agood protection function on a metal material matrix, and the bearing capacity and abrasive resistance of the metal material are improved.
Owner:TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Method for preparing layered ceramic tool based on shock wave conduction theory

The present invention belongs to the technical field of cutting tools, and in particular relates to a method for preparing a layered ceramic tool based on a shock wave conduction theory. The tool is prepared from raw materials of alumina, titanium boride, tungsten carbide cobalt and magnesium oxide. The method is characterized in that a micro-laminated layer comprises 78-83% of Al2O3 + 15-20% of TiB2 + 1-2% of MgO, and has a thickness of 100mu m, a matrix layer comprises 30-40% of Al2O3 + 60-70% of WC-Co, and has a thickness of 500mu m, the raw materials are weighed according to the ratio of 78-83% of Al2O3 + 15-20% of TiB2 + 1-2% of MgO of the micro-laminated layer and 30-40% of Al2O3 + 60-70% of WC-Co of the matrix layer by mass by use of an electronic scale, deionized water as a mediumand the alumina as grinding balls are used for planetary intensive ball milling for 150-200h, and the mixture is dried under vacuum, and sieved with a 200-mesh sieve. The mass of each matrix layer andthe mass of each micro-laminated layer can be calculated according to the mixed theoretical density and thickness of the micro-laminated layer and the matrix layer and the inner diameter of a graphite mould, a powder pressing machine is used for pressing the micro-laminated layer and the matrix layer, the micro-laminated layers and the matrix layers are placed in the graphite mould in turn (the number of the layers is 21), a vacuum hot pressing sintering process is used, temperature is 1600-1700 DEG C, pressure is 28-35MPa, and holding time is 25-30min. The layered ceramic tool prepared by the method can be widely used in the processing of difficult-to-process materials such as austenitic stainless steel, cold working die steel, martensitic stainless steel and so on.
Owner:LUDONG UNIVERSITY
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