21 results about "Boundary lubrication" patented technology

The application discloses a kind of gear engagement loop resistance measurement based on gear face lubrication state judging method, belong to gear face lubrication technical field.This method includes: installation angle sensor identifies the engagement start-stop point of each gear tooth;Constant current is applied to collect loop resistance signal, and is divided into the engagement period resistance waveform of each gear tooth;The similarity matrix between waveform and the discrete degree value of its row mean are calculated, compared with the reference value under initial good lubrication state to obtain relative deviation degree;According to relative deviation degree, elastohydrodynamic lubrication, mixed lubrication or boundary lubrication state is judged, and the gear tooth number of similarity abnormality is output simultaneously.The application can also extract oil film extrusion depth coefficient and recovery residual coefficient, and identify lubricating film dynamic instability through inter-circle cross-correlation analysis.The method realizes gear tooth level lubrication state evaluation and abnormal positioning, is robust to working condition change, and is convenient for online monitoring and predictive maintenance.

The application provides a stainless steel calendering forming synergistic lubrication treatment method and a stainless steel plate, and belongs to the technical field of metal material plastic forming. The method comprises the following steps: performing laser micro-texturing treatment on a to-be-formed surface of a stainless steel plate to prepare a micro-pit array; coating a layer of composite nano-lubricant on the surface of the treated plate, wherein the lubricant comprises base oil, nano-solid lubricating particles, a surfactant and a polar additive; and finally performing calendering forming on the plate coated with the lubricant. The application also provides a corresponding stainless steel plate, which is provided with a micro-pit array on the surface, and the micro-pit is filled with the composite nano-lubricant. Through the synergistic effect of laser micro-texturing and the composite nano-lubricant, a stable and strong boundary lubrication film is formed at the calendering interface, the ultimate drawing ratio of the stainless steel is significantly improved, the mold wear is reduced, and the surface quality of the formed part is improved.

The invention relates to the technical field of ship propulsion systems, and particularly discloses a texturing-self-lubricating synergistically reinforced hub joint surface structure and a wear depth prediction method. The joint surface structure comprises a propeller hub and a crank pin disc, and the joint surface of the propeller hub adopts a partition micro-texture design: the periphery is a groove type micro-texture for guiding oil and discharging chips; and the inner side is a pit-shaped micro-texture and is used for storing oil and lubricating. A gradient nanocrystalline strengthening layer is formed on the combined surface of the crank pin disc through ultrasonic rolling treatment, and a self-lubricating material column is embedded in the combined surface in an interference pressing mode, so that solid lubrication and high bearing capacity are achieved. The wear prediction method comprises the following steps: calibrating a wear coefficient K through a fretting wear experiment; establishing a finite element model to simulate and obtain the distribution of the contact pressure P and the inching slip amplitude S; and substituting the P and S field data and the K value into an Archard model to calculate the wear depth, and generating a visual prediction cloud picture. Through the synergistic effect of the texture and the self-lubricating material, the boundary lubricating state is remarkably improved, the wear rate is reduced, wear distribution can be accurately predicted, a basis is provided for condition-based maintenance, and the service life of the controllable-pitch propeller is prolonged.

This invention belongs to the field of crankshaft technology, and specifically relates to a crankshaft, its manufacturing method, and its applications. The crankshaft of this invention includes a crankshaft body and a composite layer disposed on the surface of the crankshaft body; the composite layer includes a nitrided layer, a phosphate layer, and a lubricating layer arranged sequentially from the inside out. The nitrided layer improves the fatigue strength and wear resistance of the crankshaft. The phosphate layer formed on the nitrided layer serves as a base layer, providing a good adhesion foundation for the lubricating layer and improving the bonding between the phosphate layer and the lubricating layer, i.e., improving the bonding between the lubricating layer and the crankshaft body, allowing the lubricating layer to better perform its function of reducing friction and wear. When the crankshaft-bearing friction pair enters the boundary lubrication state, the lubricating layer is consumed first, forming a solid lubrication transfer film on the bearing surface. This avoids direct contact between the crankshaft's nitrided layer and the bearing, while also achieving a friction-reducing and lubricating effect, thus improving the wear of the crankshaft-bearing friction pair.

The invention belongs to the technical field of organic silicon lubrication, and particularly relates to a long-chain alkyl modified organic silicon composition and a preparation method thereof. The composition comprises long-chain alkyl modified organosilicon base oil, hydrocarbon base oil, an anti-wear reagent at extreme pressure and an optional composite functional additive in specific parts by weight. Wherein the long-chain alkyl modified organic silicon base oil has the following molecular structure, R is C8-C12 alkane, the value of m is 12-16, the value of n is 1-4, and n / m is 0.1-0.3. According to the composition, the compatibility with a conventional additive is remarkably improved while the low viscosity is maintained, so that the antifriction and extreme pressure antiwear properties in a boundary lubrication state are greatly improved.

This invention belongs to the technical field of surface protective coatings for sliding bearings, specifically relating to a sliding bearing, its preparation method, and its application. The sliding bearing includes a bearing substrate and a surface protective coating disposed on its surface. The surface protective coating is prepared from polyamide-imide resin, modified tin whiskers, graphite, and molybdenum disulfide. The modified tin whiskers, treated with a silane coupling agent, have a specific diameter and aspect ratio, forming a three-dimensional thermally conductive network with graphite and molybdenum disulfide within the resin substrate. Under boundary lubrication conditions, they synergistically induce the formation of a continuous and uniform composite solid lubrication transfer film. This invention also provides a method for preparing the sliding bearing, including dispersing the components in a solvent to obtain a composite slurry, coating it onto the surface of the bearing substrate, and curing it through a gradient temperature rise process to obtain the finished product. This sliding bearing possesses both excellent thermal conductivity and heat dissipation performance and an ultra-low coefficient of friction, exhibiting excellent anti-scratch capability, self-lubricating properties, and operational stability under extreme operating conditions.

The invention relates to the technical field of wear resistance of methanol fuel, in particular to an ester anti-wear agent, a preparation method and application, the molecular structural formula of the ester anti-wear agent is R-(OCH2CH2OCH2CH2O)-R, and R is C4-C8 branched chain alkyl. The ester anti-wear agent shows excellent environmental adaptability and functional compatibility through the synergistic effect of an ester-alkyl binary structure. The introduction of branched chain alkyl further optimizes the molecular spatial configuration, C4-C8 branched chain alkyl reduces intermolecular internal friction through a steric hindrance effect, and the branched chain structure can be embedded into micro pits in the surface of a friction pair to form a physical adsorption film, so that the boundary lubricating property is enhanced. Oxygen atoms in the ester group have strong electronegativity and can chemically react with the surface of a friction pair at high friction temperature to generate a chemical protective film containing oxides, and the chemical protective film can bear instantaneous high pressure, effectively prevent direct contact of the metal friction pair and reduce the wear rate; the problems that in the prior art, an anti-wear agent is high in viscosity and poor in lubricating performance are solved.

The invention relates to an ultralow-friction high-temperature self-lubricating material which is composed of a WB4 phase and a beta-B phase which are prepared from 90-92.3% of B powder and 7.7-10% of W powder according to atomic percent, the friction coefficient of the ultralow-friction high-temperature self-lubricating material under the ultrahigh temperature condition of 1100 DEG C is smaller than or equal to 0.18, and the wear rate is 10 <-5 > mm < 3 > / Nm order of magnitude. According to the invention, molten B2O3 and layered WO3 are formed in situ in an ultrahigh-temperature environment, and a mixed lubrication mode of fluid lubrication and boundary lubrication is constructed on a friction interface, so that ultrahigh-temperature ultralow friction is realized. The technical requirement of low friction at extreme high temperature in modern industry is met, and a technical path is provided for the design and preparation technology of an ultrahigh-temperature lubricating material.

The invention provides diamond wire cutting cooling liquid for silicon carbide wafer cutting, and particularly relates to the field of silicon carbide cutting liquid. The cutting coolant comprises the following components in parts by weight: 5-20 parts of polyol ester, 10-30 parts of fatty alcohol polyoxyethylene polyoxypropylene ether, 0.5-15 parts of poly (4-vinyl benzyl-tri (2-cyanoethyl) phosphonium chloride, 1-5 parts of a catalyst, 1-5 parts of a defoaming agent and 1-5 parts of an antioxidant. The cleaning agent is prepared from the following components in parts by weight: 0.01 to 1 part of aromatic acid, 0.05 to 2 parts of macromolecular viscosity modifier, 0.05 to 5 parts of zinc dialkyl dithiophosphate, 2 to 20 parts of alkynediol gemini surfactant, 0.1 to 2 parts of pH regulator, 0 to 20 parts of organic solvent, 0.02 to 2 parts of organic silicon defoaming agent and 10 to 50 parts of deionized water. The diamond wire cooling liquid for silicon carbide wafer cutting provided by the invention has the characteristics of large boundary lubricating film thickness and high boundary lubricating film strength. The cutting mode of the silicon carbide wafer from the diamond powder abrasive mortar and the steel wire is replaced by the diamond wire cutting mode, and the purposes of improving the cutting efficiency, reducing TTV, improving surface line marks and reducing the smudginess rate are achieved.

The application provides an ionic liquid type multifunctional detergent, a preparation method and application thereof, and relates to the technical field of lubricating oil additives.The ionic liquid type multifunctional detergent has a structure shown in formula I.The ionic liquid type multifunctional detergent has excellent high-temperature cleaning performance, mainly because the alkali metal carbonate in the composition of the detergent for neutralizing acid is replaced by an organic base functional group, so that the source of ash and oxidized deposits is completely eliminated; meanwhile, by constructing the ionic ashless detergent, a double-micelle structure of anions and cations is formed, so that the adsorption of oxidized deposits and worn particles is enhanced, and the colloidal stability of the detergent is improved; the structure of the ionic liquid type multifunctional detergent contains N, O and S heteroatoms, the heteroatoms have lone electron pairs, and are easy to interact with metals, so that an ordered and compact boundary lubricating layer is formed on the surface of a friction pair, thereby effectively reducing friction and wear when the friction pair moves relatively, and excellent friction-reducing and wear-resisting performance is achieved.

The application relates to the technical field of engines, and discloses an engine and a cylinder sleeve, which comprise a cylinder sleeve body, the inner wall of the cylinder sleeve body is sequentially divided into a first region, a second region and a third region, at least the first region and / or the second region are provided with a plurality of concave points, the depth of the concave points in the first region is a first preset depth, the arrangement area rate is a first preset area rate, the depth of the concave points in the second region is a second preset depth, the arrangement area rate is a second preset area rate, the first preset depth is greater than the second preset depth, and the first preset area rate is smaller than the second preset area rate. The engine and the cylinder sleeve provided by the application can improve the lean oil state, change the boundary lubrication into mixed lubrication by adopting the concave points with the larger depth and the lower distribution density in the first region, can reduce the contact area, reduce the oil film thickness, reduce the friction coefficient under the dynamic pressure lubrication state, and further reduce the oil consumption by adopting the concave points with the smaller depth and the higher distribution density in the second region.

The invention provides a polytetrafluoroethylene modified lubricating material as well as a preparation method and application thereof, and belongs to the technical field of development of lubricating materials. According to the preparation method, PPy is subjected to in-situ polymerization on the surface of PTFE through a method for modifying the surface of PTFE through pyrrole in-situ polymerization, a uniform polymer layer is generated, and the PTFE-coated PPy polymer lubricating material with a composite structure is prepared. Compared with an existing modification method, the modified PTFE has the advantages of both polypyrrole and polytetrafluoroethylene, meanwhile, the problems that pure PTFE is low in surface energy and poor in adhesion with organic materials are solved, the defects that PTFE is high in wear rate, poor in bearing capacity, poor in stress cracking resistance and creep resistance and the like are greatly overcome, the service life of the PTFE is prolonged, and the service life of the PTFE is prolonged. Further, the bearing capacity and the service life of the solid lubricating material under the dry friction or boundary lubrication condition are improved, and the application potential of the solid lubricating material in mechanical moving parts with harsh requirements is expanded.

This application relates to a friction testing machine capable of monitoring boundary lubrication conditions, comprising: a pressure applying device, a rotary drive device, a rolling clamp, a steel ball, and a turntable; wherein, the pressure applying device is located on one side of the rotary drive device along a first direction; the turntable is disposed at one end of the rotary drive device near the pressure applying device, and the rotary drive device is used to drive the turntable to rotate on a first plane; the rolling clamp is disposed at one end of the pressure applying device near the rotary drive device; the steel ball is rotatably clamped on the rolling clamp; the pressure applying device is configured to apply a loading force to the steel ball along the first direction, so that the steel ball abuts against the turntable; the first direction is perpendicular to the first plane. Thus, after the turntable contacts the steel ball, the turntable rotates, and the steel ball can also rotate around its own center, realizing the rolling of the steel ball on the turntable, thereby enabling the friction testing machine to perform rolling friction tests.

The invention discloses a visual guidance positioning conveying device for transparent package high-precision printing, and relates to the technical field of transparent package production, the visual guidance positioning conveying device comprises a conveying belt, a protective cover, a printing machine, a visual detection machine, an adjusting mechanism and a matching mechanism, a bottom plate is arranged at the center of the conveying belt, the protective cover is fixedly connected to the top of the conveying belt, and the adjusting mechanism is arranged; deviation correction is achieved by adjusting the placing angle of a transparent package, meanwhile, clean airflow is sprayed to a contact area of the transparent package, a local air cushion is formed between a roller and the package, and dry friction is optimized to be in a boundary lubrication state, so that the friction transmission deviation correction mechanism is kept, and meanwhile the friction transmission deviation correction efficiency is improved. And the contradiction between the protection surface and the effective driving in the correction of the transparent package is fundamentally solved.

The application discloses an environment-friendly eutectic solvent anti-friction and anti-wear additive and a preparation method and application thereof, and belongs to the field of lubricating additives.The application uses cetyltrimethylammonium chloride / cetyltrimethylammonium bromide and natural plant source thymol as raw materials, mixes them in a molar ratio of 1:1 to 1:3, stirs them at a constant temperature of 90 DEG C for 2 hours, and thus a sulfur-free and phosphorus-free transparent stable eutectic solvent is prepared without an organic solvent and a catalyst; the solvent is used as an anti-friction and anti-wear additive, is added into lithium-based lubricating grease in an addition amount of 0.5wt% to 2.0wt%, is uniformly dispersed through three-roll grinding, and thus high-performance modified lubricating grease suitable for severe working conditions is obtained.The raw materials are green and renewable, the preparation process is mild and simple, and the environment compatibility is excellent; a low addition amount can significantly reduce a friction coefficient and wear volume, a dense adsorption film is formed on a metal friction surface, and the application is particularly suitable for long-acting anti-friction and anti-wear lubrication under high-speed and boundary lubrication working conditions such as cotton picker picking spindles.

Provided is a novel sealing device capable of suppressing friction even in boundary lubrication or mixed lubrication. A sealing device (1) is provided with a sealing member (6), and the sealing member (6) contains a rubber composition containing a compound having a functional group at a terminal and having an aliphatic hydrocarbon group having 4 or more carbon atoms.

Provided are a sliding member and a piston ring having a DLC coating film that has excellent wear resistance even when used in a boundary lubrication environment. This sliding member has a base material and a DLC film that is formed on the surface of the base material and does not substantially contain hydrogen, and is characterized in that: the center wave number of the G band in the Raman spectrum of the DLC film obtained by Raman spectroscopy using laser light in the visible region as excitation light is 1585 cm-1 or more; the DLC coating film obtained by a nanoindentation method has a hardness (HIT) of 15 GPa or more and 35 GPa or less in a gigapascal unit.

The application discloses a rotating pair water film self-adaptive establishing and stabilizing method and structure, which is suitable for passive regulation of a water film of a relative rotating pair of underwater equipment. The method realizes the whole process of film establishment, film stabilization and film elimination by relying on the coupling of the geometric characteristics of the structure itself, rotating speed and water flow, and does not need external active control devices. The structure comprises a fixed fitting part and a rotating fitting part, and the fitting surface adopts an axial segmented same-taper conical surface, wherein the water outlet section is a water outlet converging conical surface, and the water inlet section is a water inlet gap conical surface, which has the functions of throttling damping and thermal expansion compensation, and is provided with an axial limiting structure to reduce reverse impact. The water outlet converging conical surface forms a dynamic pressure water film to realize non-contact support during normal rotation, and relies on viscous shear flow and boundary lubrication to avoid dry friction during reverse rotation by the axial limiting structure. The application overcomes the shortcomings of traditional directional groove structures, such as being suitable for only one-way rotation and poor low-speed performance, and has simple and reliable structure, can be compatible with a silt-resistant structure, and is suitable for various underwater rotating support devices.

The present application relates to a kind of full synthesis easy-to-clean copper cutting fluid and its preparation method.The raw material of the full synthesis copper cutting fluid includes composite rust inhibitor, chelating agent, special amine, aluminum copper corrosion inhibitor, lubricant, defoaming agent and solvent, and the composite rust inhibitor is composed of sebacic acid and dodecanedioic acid.The composite rust inhibitor can overcome discoloration corrosion well, has obvious cost advantage, and will not produce obvious color residue, can meet the existing user demand.Sebacic acid and dodecanedioic acid are not long carbon chain (C10 / C12) can be embedded in the gap of lubricating film, improve boundary lubrication performance, make friction coefficient reduce 5~8%, adapt to medium-low speed heavy load processing, not easy to break in long-term cyclic use (>6 months), especially suitable for the processing of nickel-containing copper alloy, can reduce the risk of pitting.

The application provides a speed reducer lubricating device and method, relates to the technical field of speed reducer lubrication, and comprises a mounting frame fixedly connected to the inner side wall of an upper shell, a transmission shaft clamped between the upper shell and a lower shell, an eccentric wheel fixedly connected to the outer side wall of the transmission shaft, an adjusting rod rotatably connected to the end of the eccentric wheel away from the upper shell, a sliding groove formed in the adjusting rod, a limiting rod fixedly connected to the outer side wall of the end of the adjusting rod close to the eccentric wheel, and a spring arranged on the outer side wall of the limiting rod; the cooperation of the eccentric wheel, the mounting frame, the adjusting rod, the limiting rod, the spring, the fixing block, the sliding rod, the connecting head, the sliding groove, the reset spring and the push ball facilitates the lubrication of the gears during the start of the speed reducer, avoids dry friction or boundary lubrication state at the moment of starting, effectively prevents the gear tooth surface from being damaged in the form of small scratches, peeling and pitting, the gear tooth surface precision is maintained, power transmission is stably performed for a long time, and the service life of the gear is greatly prolonged.

The present application relates to a kind of engine sliding bearing lubrication coordination evaluation method, according to bearing lubrication state and proportion, bearing peak oil film pressure average, axial oil film pressure load uniformity and total friction loss power consumption of friction pair per cycle, sliding bearing lubrication coordination factor Λ3 is calculated, the coordination of the sliding bearing lubrication of engine is evaluated.The present application introduces lubrication coordination factor, considers the boundary lubrication of bearing, mixed lubrication and rough hydrodynamic lubrication state distribution, axial oil film load uniformity, bearing peak oil film pressure and total friction loss power consumption of friction pair per cycle, the coordination of the sliding bearing lubrication of engine is described and evaluated using the above four indicators.