19 results about "Fretting" patented technology

An in-situ fretting corrosion fatigue testing machine based on synchrotron radiation diffraction and three-dimensional (3D) imaging includes an axial fatigue loading system, a fretting loading system, and a corrosion environment control system, where the axial fatigue loading system includes a driving device, a load control device, and a load sensing device; the load sensing device is configured to measure an axial force and a normal force in real time; the driving device is configured to drive the load control device, thereby achieving axial displacement of the load control device; the load control device is configured to carry out axial fatigue loading of a specimen; and the fretting loading system includes a fretting wear device. The testing machine achieves real-time 3D imaging characterization of wear spot and crack morphology of a material in a fretting corrosion environment, as well as characterization of a residual stress evolution law.

The invention relates to a preparation process optimization method of a zirconium alloy material with high fretting wear resistance, which comprises the following steps: setting a chemical component optimization range of a zirconium alloy, including specific proportions of tin, iron, niobium, chromium and oxygen elements; establishing a computer simulation model, and predicting the wear volume, tribological stability and microstructure evolution of the material under the fretting wear condition; then, a complete optimization scheme is output based on the model optimization homogenization treatment temperature interval, the hot working deformation range, the cold working cumulative deformation degree and the annealing system; and finally, a preparation process sequence including smelting, homogenization treatment, hot working deformation, cold working deformation and final heat treatment is implemented, the zirconium alloy material with the equiaxed grain structure is prepared, and the wear resistance of the zirconium alloy material is verified through an experimental fretting wear performance test. Compared with the prior art, the method has the advantages that through systematic component design and process parameter simulation optimization, the material performance is remarkably improved, and the application reliability is enhanced.

The utility model discloses a punching composite fretting wear test fixture. The punching composite fretting wear test fixture comprises a tangential moving assembly, a tangential fixture for clamping a rod-shaped sample, a radial moving assembly and a radial fixture for clamping the rod-shaped sample, the tangential clamp is opposite to the radial clamp; the tangential clamp is fixed to the tangential moving assembly, and the tangential moving assembly drives the tangential clamp to move back and forth in the tangential direction. The radial clamp is fixed to the radial moving assembly, and the radial moving assembly drives the radial clamp to move back and forth in the radial direction. The device is used for clamping a rod-shaped sample and driving the rod-shaped sample to move in the tangential direction and the radial direction, tangential fretting and impact fretting wear tests are carried out on the surface of the rod-shaped sample, the wear condition of the sample under the actual working condition is truly reflected, and the surface punching composite fretting wear performance of different materials is tested.

The invention relates to a design method of a diamond-like carbon wear-resistant coating for a zirconium alloy component of a nuclear reactor, which comprises the following steps: establishing a fretting wear prediction model of the zirconium alloy component in a nuclear reactor environment, and calibrating the model based on experimental data to simulate flow-induced vibration and contact stress distribution; the performance parameters of the diamond-like carbon coating are designed through an optimization algorithm by utilizing model output and combining friction coefficient and wear rate data; based on the design parameters, simulating and optimizing the coating preparation process through a process simulation model, so that the coating is firmly combined with the substrate; and finally, verifying the long-term wear performance of the coating through experiments to finish design verification. Compared with the prior art, through the systematic design process, the fretting wear resistance of the coating is remarkably improved, the problem that zirconium alloy parts are worn due to flow-induced vibration is effectively solved, the service life of the parts is prolonged, and the operation safety of a nuclear reactor is guaranteed.

This invention relates to a method for predicting the wear performance of aluminum alloy surfaces using self-lubricating composite ultrasonic shot peening. The method first pre-treats the aluminum alloy surface, then textures the surface using laser processing, fills it with a self-lubricating material, and finally performs ultrasonic shot peening to form a mechanically interlocking structure that enhances the bonding strength of the filler layer. Ultrasonic shot peening creates a fine-grained strengthening layer and a residual compressive stress field on the substrate surface, significantly improving surface hardness and fatigue resistance. Simultaneously, this invention provides a wear performance prediction method based on ABAQUS simulation. By simulating the ultrasonic shot peening process using DEM-FEM coupling, a fretting wear model is constructed, and energy wear theory is used to predict the friction coefficient and wear rate. This method achieves four benefits for aluminum alloy surfaces: lubrication and friction reduction, mechanical interlocking, surface strengthening, and fatigue resistance. It can also predict wear performance in advance, guide process optimization, significantly improve R&D efficiency, and reduce experimental costs.

The application discloses a controllable magnetic field and atmosphere multi-mode fretting-sliding wear test device and method, and belongs to the technical field of material friction and wear performance test. The device comprises a magnetic field generating module, a magnetic attraction force closed-loop regulation and control system, a friction and wear test platform and an atmosphere environment control mechanism. The friction and wear test platform comprises a fretting friction and wear module and a sliding friction and wear module. The fretting friction and wear module and the sliding friction and wear module are respectively used for fretting friction and wear test and sliding friction and wear test of the sample to be tested. The atmosphere environment control mechanism is used for controlling the atmosphere environment of the sample to be tested. The application can solve the technical bottleneck that the traditional device cannot dynamically match the magnetic field and mechanical parameters, lacks multi-mode friction and wear test simulation and controllable atmosphere environment, significantly improves the reliability and applicability of test data, and provides technical support for the research on material friction and wear behavior under a complex magnetic field environment.

The invention relates to the technical field of aero-engine design, and provides a surface strengthening treatment method based on coating-free laser shock peening and a nickel-based alloy component, the nickel-based alloy component comprises a component body, and the surface of the component body is provided with a layered microstructure formed through coating-free laser shock peening process treatment; the layered microstructure comprises a remelting layer and a deformation layer which are sequentially stacked from outside to inside; the remelting layer is a layer body formed by melting, cooling and solidifying a surface material of the component body; and the deformation layer is a layer body formed by plastic deformation under the action of shock waves. According to the method, the surface of the nickel-based alloy component is subjected to strengthening treatment by adopting a coating-free laser shock strengthening process, so that the process limitation of a traditional LSP technology in complex molded surface application is broken through, and the applicability is remarkably improved; and a layered microstructure composed of a deformation layer and a remelting layer is formed through induction, generation and expansion of cracks in a fretting contact area are restrained, and the fretting wear resistance and the fretting fatigue resistance of the nickel-based alloy component are enhanced.

A connection system for a lid in a beacon housing. The lid is connected to the housing at a tab at a first end, after a lip of the lid is placed under a shelf at its second end. The tab has a cross-bore for receiving a connection pin through both the cross-bore and corresponding holes in the housing which form a continuous passage. The lid is placed under tension to reduce relative vibration between the lid and the housing. A set screw is placed within the tab to place a force on the connection pin. Further set screws are distributed about the lid and place the lid in tension relative to the housing. The lid can be removed by reducing the tension provided by the set screws, removing the connection pin, and adjusting the lid such that it is no longer under the shelf of the housing.

The application discloses a wear-resistant nanometer gradient composite coating and a magnetron sputtering method thereof, and belongs to the technical field of material surface treatment. The wear-resistant nanometer gradient composite coating is composed of oxide nanoparticles and a soft layer. The soft layer is coated on the outside of the oxide nanoparticles during friction. The oxide nanoparticles gradually decrease from the surface to the center of the coating, and the soft layer gradually increases from the surface to the center of the coating, forming a reverse composite gradient layer. The soft layer and the oxide nanoparticle layer are obtained through the magnetron sputtering method. The soft layer is composed of Ag and Cu soft metals. The oxide nanoparticles are Fe2O3 nanoparticles. The oxide nanoparticles have a bearing effect, and can reduce fretting wear of the material through rolling. The soft metal has a coating and bonding effect on the nanometer oxide particles. The wear-resistant nanometer gradient composite coating and the magnetron sputtering method thereof can solve the problem that the existing wear-resistant nanometer hard coating is easy to peel off, thereby affecting the service life of the coating.

This application relates to a manufacturing process for a marine container lashing fork, which pertains to the field of marine containers. The process involves screwing a screw into a threaded hole in a connector; welding the portion of the connector located at the end of the threaded hole to the screw; machining a first insertion hole on the welded connector and a second insertion hole on the screw, the first and second insertion holes together forming an insertion channel communicating with the threaded engagement gap; forming an venting and discharge channel communicating with the threaded engagement gap; placing a filler block into the insertion channel and heating it to melt; inserting a rod into the insertion channel, forcing the molten filler material into the threaded engagement gap; and cooling and solidifying the filler material after it flows out of the venting and discharge channel to form a filler layer. This application can reduce the risk of fretting and loosening within the threaded pair and reduce the risk of corrosion from moisture and salt spray.

The invention provides an anti-fretting wear sectional surface texture design method for a titanium alloy rotor shaft external spline, which comprises the following steps of: calculating to obtain Mises equivalent stress and surface contact stress distribution characteristics of the titanium alloy rotor shaft spline from top to bottom (in the axial direction of an inner shaft and an external spline) and from top to bottom (in the radial direction of the inner shaft and the external spline) in a transmission process; and then the spline is divided into sections from top to bottom and from top to bottom, corresponding surface textures are designed according to the stress characteristics of the divided sections, the surface contact stress uniformity is improved while the local stress concentration phenomenon of the surface of the spline pair is reduced, and the Mises equivalent stress distribution condition of the spline pair is improved. Through the sectional surface texture design, the service reliability of the titanium alloy rotor shaft spline pair is improved, and the service life of the titanium alloy rotor shaft spline pair is prolonged.

The invention discloses a corrosion fretting wear experimental device, which relates to the field of material performance testing, and comprises an experimental platform, an experimental assembly, an environment control box, a gasification assembly and a power assembly, the environment control box is located on the experiment platform and comprises a box body, a controller and a corrosive gas concentration meter, and the controller is in signal connection with all the assemblies and controls operation of the gasification assembly to regulate and control the corrosive gas concentration; the experiment assembly is located in the box body and provides micro-motion for a sample; the gasification assembly is located on one side of the experiment platform and provides corrosive gas for the box body. The power assembly is fixed on the experiment platform and is in transmission connection with the experiment assembly. When a test sample corrosion fretting wear experiment is carried out, a test sample is put into the experiment assembly and put into the box body, the controller controls the power assembly to move the experiment assembly and open the experiment assembly and the gasification assembly to carry out the experiment, the corrosion gas concentration is monitored and the gasification assembly is regulated in the experiment process, and the experiment assembly does not need to be paused; and the synchronous development capability of the fretting wear experiment and the salt spray corrosion experiment is improved.

This invention relates to the field of metal cutting technology, specifically to a method for analyzing the fretting slip wear mechanism of titanium alloy TC4 extreme continuous cutting tools, aiming to solve problems such as severe tool wear and poor machining stability in extreme cutting of this material. The method includes: conducting extreme continuous cutting experiments with AlCrN coated and uncoated carbide end mills; establishing a milling theoretical model and analyzing the cutting forces at each cutting stage; observing tool angle changes and edge wear patterns; using EBSD technology to analyze the workpiece crystal structure and phase changes; and obtaining friction coefficient data through fretting wear experiments. This method systematically reveals the wear patterns of the two types of tools, the fretting slip wear mechanism, and the correlation between workpiece phase transformation and the cutting system, providing a scientific basis for tool selection, structural optimization, and tool change timing determination, achieving efficient, precise, and stable machining of titanium alloy TC4 workpieces, and meeting the needs of high-end fields such as aerospace.

The invention relates to a construction method for a torsional shear type high-strength bolt of a steel structure node, which comprises the following steps of: 1, carrying out a high-strength bolt fastening axial force test and an anti-slip friction surface test, determining a torque coefficient control value, and checking a torque wrench; 2, after bolt joints with different plate thicknesses are treated, the friction face of the steel structural component is cleaned, the steel structural component is temporarily fixed through installation bolts after being hoisted in place, then the installation bolts are replaced with high-strength bolts, initial screwing is conducted, then final screwing is conducted on the high-strength bolts, and finally paint on the connecting face is coated in a supplementary mode; according to the method, fatigue crack propagation caused by stress overrun of the waterproof cloth due to sudden change of the plate thickness is avoided through pre-test verification, and after construction optimization treatment is carried out on bolt nodes with different plate thicknesses and the plate thickness difference is eliminated, friction surface cleaning is carried out, the micro-motion slippage amplitude is reduced, initial screwing and final screwing are carried out, and plate seam gaps are eliminated in stages, so that the reliability of the waterproof cloth is improved. And accurate torque transmission is ensured, so that the fatigue life of the steel structure joint is prolonged.

The invention discloses a controllable magnetic field and atmosphere multi-mode fretting-sliding wear test device and method, and belongs to the technical field of material friction wear performance test. The device comprises a magnetic field generation module, a magnetic attraction force closed-loop regulation and control system, a friction wear test platform and an atmosphere environment control mechanism, the friction-wear test platform comprises a fretting friction-wear module and a sliding friction-wear module, and the fretting friction-wear module and the sliding friction-wear module are respectively used for performing a fretting friction-wear test and a sliding friction-wear test on the to-be-tested sample; and the atmosphere environment control module is used for controlling the atmosphere environment where the to-be-tested sample is located. The device can solve the technical bottleneck that a traditional device cannot dynamically match a magnetic field and mechanical parameters and lacks multi-mode friction wear test simulation and a controllable atmosphere environment, the reliability and applicability of test data are remarkably improved, and technical support is provided for research of material friction wear behaviors in a complex magnetic field environment.

The utility model discloses a kind of sealed connection structure of long-term tolerance refrigerant, it is related to pipeline connection technical field, it includes first connection flange and second connection flange, annular groove is set up on first connection flange near the center hole, O-shaped sealing ring is arranged in annular groove, wear-resistant corrosion-resistant material layer is compounded on the surface of O-shaped sealing ring, and its height before compression is 0.1-0.2mm higher than annular groove, and the edge of second connection flange is formed with the pressing sealing surface radially protruding from center hole, and the pressing sealing surface covers annular groove and extrudes O-shaped sealing ring to form sealing structure. The utility model is high-pressure sealing reliability, anti-vibration, anti-thermal deformation, anti-refrigerant corrosion;Flow passage optimization reduces flow resistance, reduces compressor power consumption;Ternary ethylene-propylene composite layer and anti-micro-motion wear structure, sealing life is improved.

The present disclosure provides an inductive heating type fretting fatigue test device and method, and relates to the technical field of material performance testing. The device comprises a clamping mechanism for clamping a fretting fatigue test piece and a pad, one end of the pad abutting against the surface of the test piece and transmitting a normal load to the test piece; a loading mechanism connected with the clamping mechanism for loading the test piece; and a heating mechanism comprising multiple groups of inductive coils and heating bodies, the heating mechanism heating the heating bodies by using the inductive coils, and the heating bodies providing a high-temperature environment for the test piece through heat radiation. The fretting fatigue test device and method provided by the present disclosure can prevent the pad from following the test piece during the loading process, prevent the eccentric loading of the fretting fatigue load during the test process, and heat the test piece based on the electromagnetic induction principle, thereby improving the heating efficiency, reducing the space required for the test, and facilitating the observation and analysis of the damage evolution of the fretting fatigue test piece during the test process.

The invention discloses a punching composite wear test method and device in a high-temperature liquid environment, and relates to the field of tribological test, the device comprises a T-shaped table, the outer wall of a test cavity is wrapped with a heating element, an impact motion module is arranged above the test cavity, and a cooling device is arranged in the middle of the test cavity; the impact motion module is installed on the impact motion platform, the lifting mechanism is installed on the lifting servo motor lead screw module on the rear side of the normal loading lead screw module, and meanwhile the precise linear modules are arranged on the two sides of the lifting mechanism. Through multi-shaft linkage control, impact, tangential composite and single impact, tangential fretting wear tests, impact force closed-loop control and convenient mutual conversion between a loading and unloading station and a test station can be realized, and the influence of a complex environment on sensitive components in the test is fully considered through key component position design. The device can be used for micro-motion and sliding wear tests in complex environments such as high temperature, liquid, atmosphere and the like.

This invention relates to the field of electronic materials technology, and more particularly to an automotive-grade ceramic aluminum-based copper-clad laminate and its processing method. The technical solution includes a copper-clad layer, a ceramic layer, a nano-gradient interface layer, and an aluminum base layer. The ceramic layer adopts a functionally graded integrated design. The aluminum base layer integrates heat dissipation fins, pin-shaped heat dissipation columns, and microporous channels. Reinforcing ribs penetrate the mounting holes of the interface layer to form a macroscopic mechanical interlock. The peripheral locking mechanism converts the longitudinal bolt locking force into a lateral clamping force through the cooperation of wedge-shaped blocks and slots, actively suppressing vibration fretting and thermally induced shear stress, greatly enhancing the vibration resistance and reliability of the overall structure. The nano-gradient interface layer, composed of an alumina nanofiber layer and a nanowire composite network, solves four major problems: interface bonding, ultra-high thermal conductivity, oxidation resistance, and stress buffering. This invention achieves excellent electrical insulation, extremely high thermal conductivity, excellent thermal shock resistance, and strong mechanical strength, perfectly meeting the requirements of automotive applications.