52 results about "High speed deformation" patented technology

The invention relates to a method for processing the high-speed deformation on the surface of metallic material with nano structure, and particularly provides a method for realizing high-speed processing of the organization structure of ultra-fine grains. On the condition of room temperature or low temperature, by adopting a mechanical treatment method with high-speed plastic deformation, the nanoscale bulky crystalline grain structure on the surface layer of the metallic material is refined as equiaxial submicron crystalline grain or nano crystalline grain to form an ultra-fine organization structure of the crystalline grain on the surface layer of the metallic material. With the increase of the depth to the processing surface, the size of microstructure has the change of gradient, increasing from nanoscale and submicron size to micron size. Compared with the existing processing method for forming a surface ultra-fine crystalline grain structure, the high-speed processing method of the invention greatly reduces the roughness of the surface of the processed metallic material and increases the thickness of a deformation layer, and has simple processing method and high working efficiency.

The invention relates to a compound excitation permanent magnet synchronous generator for electric vehicles. An auxiliary electric excitation winding and built-in V-shaped magnetic steel are arrangedin a rotor iron core in the circumferential direction; the built-in V-shaped magnetic steel and a pole shoe form a permanent magnet pole, and the auxiliary electric excitation winding and an interwinding iron core form an excitation pole; the permanent magnet and the auxiliary electric excitation winding together generate armature induction potential, the air gap magnetic field can be adjusted conveniently by adjusting the magnitude and the direction of the DC excitation current in the electric excitation winding, and the purposes of high efficiency, energy saving and high-precision adjustmentof the voltage at an output end are achieved; meanwhile, the permanent magnet rotor is made of the V-shaped segmented magnetic steel, and holes are arranged in the pole shoe to lighten the weight ofthe rotor to avoid the high-speed deformation of the rotor; a groove is formed at the center of the pole shoe in the radial direction, and nonmagnetic good conductors are filled in the groove; and magnetism isolating grooves are arranged at two ends of the V-shaped magnetic steel, thereby inhibiting the static and dynamic armature reaction, improving the output voltage waveform, increasing the airgap magnetic density, reducing the magnetic leakage and increasing the output power. The compound excitation permanent magnet synchronous generator can smoothly operate at high power density, speed and precision.

This invention relates to a technique that raises strength of metal and alloy, especially provides a method that in the precondition that chemical composition of metal and alloy is not changed, raising strength of metal and alloy by technique of dynamic state plastic deformation. Utilize technique of dynamic state high speed deformation, progress many manipulations with low temperature single direction, deformed strain rate is: 101-104s-1;Deformed strain variable is: total deflection exceed 1(computing method is:epsilon=ln H0 / H>1),epsilon is deflection, H0 is thickness of material without deformation, H is thickness of material with deformation; Deformation temperature is: 30deg.C to -200deg.C. This invention utilizes technique of high speed deformation, preparative method is simple, and it is easy to control parameter of deformation technology and deformation temperature. It can produce metal and alloy with high intensity through necessarily improve orthodox deformation technique, optimize technology parameter and deformation temperature. This invention does not chemical constituent of materials, only through adjust material microstructure to strengthen metal and alloy.

The invention provides a miniature stretching rheological device for in-situ structure detection of a polymer film material, and an experimental method thereof. Accurate temperature control and high-speed deformation of a polymer film sample are achieved in a limited space; strain and strain rate can be accurately controlled and continuously adjusted at the same time; the device adopts a brushless servo motor of a hollow core cup to drive a driving shaft to rotate; a stretching rheological operation is exerted on the sample; the rotating speed and displacement of the motor are accurately controlled by Labview control program combined with a hall sensor and an encoder of a motor; a driven shaft of the device is connected with a miniature tension sensor; and the change of tension in the stretching rheological process is tracked in real time. The miniature stretching rheological device has the advantages of being small in volume, light in weight, convenient to install, suitable for collocation with equipments such as a microfocus X-ray diffraction station, an optical microscope, and a Fourier transform microscopic infrared spectrograph, and is a good device for in-situ research of internal structure change in the high-polymer material stretching rheological process under different temperature conditions.

A combined type seamless expansion joint structure used for bridge pavement structures is disclosed. The expansion joint structure includes a straddle steel plate spanning an expansion joint, and an elastic telescoping component between two pavement structures. The bottom surface of the straddle steel plate is provided with a self-leveling mortar base layer paved on two sides of the top surface of the expansion joint. The elastic telescoping component covers the straddle steel plate and the self-leveling mortar base layer. Bottom two sides of the elastic telescoping component are provided with two mounting slots longitudinally. Fiber rods are disposed in the mounting slots. Anchoring adhesion seams are between the elastic telescoping component and the pavement structures. The anchoring adhesion seam and the mounting slot which are at same side are communicated through a connecting slot in the bottom surface of the elastic telescoping component. The anchoring adhesion seams, the mounting slots and the connecting slots are filled with flexible structural glue. The expansion joint structure has low-temperature toughness, a characteristic of high-speed deformation resilience under heavy loads and a simple structure, and is convenient to construct.

The present invention relates to a hot-rolled steel sheet, a cold-rolled steel sheet, and a plated steel sheet having improved uniform ductility and local ductility at a high strain rate. A multi-phase hot-rolled steel sheet according to one mode of the present invention has a metallurgical structure having a main phase of ferrite with an average grain diameter of at most 3.0 µm and a second phase including at least one of martensite, bainite, and austenite. In the surface layer, the average grain diameter of the second phase is at most 2.0 µm, the difference (”nH av ) between the average nanohardness of the main phase (nH ±av ) and the average nanohardness of the second phase (nH 2nd av ) is 6.0 - 10.0 GPa, the difference (”ÃnH) of the standard deviation of the nanohardness of the second phase from the standard deviation of the nanohardness of the main phase is at most 1.5 GPa, and in the central portion, the difference (”nH av ) between the average nanohardnesses is at least 3.5 GPa to at most 6.0 GPa and the difference (”ÃnH) between the standard deviations of the nanohardnesses is at least 1.5 GPa.

The invention discloses a method and a device for electromagnetically forming a metal pipe fitting in a radial and axial loading mode. The device mainly comprises an eddy current coil, magnetic field coils and power systems. The eddy current coil generates induced eddy currents, the magnetic field coils generate radial magnetic fields, and the eddy current coil and the magnetic field coils are powered by the power systems. The method and the device have the advantages that electromagnetic force can be radially and axially loaded simultaneously in a procedure for electromagnetically forming the metal pipe fitting, an electromagnetic force loading mode can be adjusted, and accordingly machining requirements of different workpieces can be met; the axial compression type pipe fitting is electromagnetically expanded, so that the thickness reduction of a pipe wall in an expansion procedure can be effectively reduced, the forming limit of a formed workpiece is increased, and the forming performance of the formed workpiece is improved; high-speed deformation experiment conditions in different load forms can be provided for metal pipe fittings by the method for electromagnetically forming the metal pipe fitting in the radial and axial loading mode, and novel experiment measures are provided for research on high-speed deformation mechanisms of materials.

The invention relates to a method for processing the high-speed deformation on the surface of metallic material with nano structure, and particularly provides a method for realizing high-speed processing of the organization structure of ultra-fine grains. On the condition of room temperature or low temperature, by adopting a mechanical treatment method with high-speed plastic deformation, the nanoscale bulky crystalline grain structure on the surface layer of the metallic material is refined as equiaxial submicron crystalline grain or nano crystalline grain to form an ultra-fine organization structure of the crystalline grain on the surface layer of the metallic material. With the increase of the depth to the processing surface, the size of microstructure has the change of gradient, increasing from nanoscale and submicron size to micron size. Compared with the existing processing method for forming a surface ultra-fine crystalline grain structure, the high-speed processing method of the invention greatly reduces the roughness of the surface of the processed metallic material and increases the thickness of a deformation layer, and has simple processing method and high working efficiency.

A method of designing a roller bearing is disclosed upon clarifying mechanisms of damage patterns in respect of two kinds of brinelling, involved in the bearing, wherein white-banded flaking (brittle flaking) is a plastic instability phenomenon appearing under high-speed deformation accompanied by adiabatic shear deformation status with the resultant occurrence of adiabatic shear band (also called white band) inside material of the bearing. This enables all of the damage patterns to be determined upon making comparison between shear strain and shear strain rate, occurring inside the bearing, and discriminated values.

This invention provides a Zn-Al alloy, which is excellent in static deformability, as well as in dynamic deformability, and can be applied to a large structure, and a process useful for producing the Zn-Al alloy. The Zn-Al alloy comprises Zn: 30 to 99% (% by mass; the same shall apply hereinafter) with the balance consisting of Al and unavoidable impurities, wherein the Zn-Al alloy has a texture comprising a ss phase finely dispersed in an a phase or a' phase having an average grain diameter of not more than 5 [mu]m, the maximum diameter of Al-based inclusions is not more than 50 [mu]m, and, at the same time, pores having a equivalent circle diameter of not less than 0.5 mm are absent, and the macrosegregation of Al is less than 3.0%, and the microsegregation of Al is less than 2.0%.

The invention discloses a three-dimensional speckle strain measurement method, comprising: (1) speckle preparation; (2) camera calibration; (3) state information acquisition; (4) computational domain designation; (5) initial point setting; (6) speckle matching; (7) three-dimensional reconstruction; and (8) strain computation. By the above operation steps, the invention provides a three-dimensional speckle strain measurement method, which can effectively obtain high preciseness measurement results in measurements of material characteristic parameters such as full-field vibration measurement, dynamic strain measurement, high speed deformation measurement, fracture mechanics, impact excitation and dynamic material experiments. The invention has the characteristics of convenient measurement operation, high automation degree, exact and reliable results, high efficiency and non-contact measurement.

The invention discloses a preparation method of a bimodal tissue Mg-6Zn-0.45Zr alloy. The method comprises alloy heat treatment and alloy hot working, wherein the preservation temperature of the alloyheat treatment is 330 + / -5 DEG C, the heat preservation time of the alloy is 10 + / -0.5 hours, and the cooling mode is air cooling; and the temperature of the alloy hot working is 250 + / -5 DEG C, theheat preservation time before the alloy hot working is 10 + / -1 minutes, the alloy hot working mode adopts small-pass strain high-strain-rate three-direction forging, the forging equipment is an air hammer, secondary heating is not repeated among the passes, the pass strain capacity is 10 + / -0.5%, the deformation pass is 24 passes, and the cooling mode is the air cooling. According to the preparation method, the bimodal tissue Mg-6Zn-0.45Zr alloy with controllable crystalline grain distribution can be prepared, and the bimodal tissue Mg-6Zn-0.45Zr alloy has excellent comprehensive mechanical properties; the temperature drop caused by heat dissipation is made up by utilizing the temperature rise effect of high-speed deformation, no heating is needed among the passes, and the method is shortin machining period and is suitable for producing large-size block body of the Mg-6Zn-0.45Zr alloy.

The invention discloses an electromagnetic pulse forming device and method for a metal sheet. The electromagnetic pulse forming method includes the steps that S1, when the metal sheet to be formed is arranged between a forming die and a forming coil, pressure equipment is used for applying pressure through a blank holder, and accordingly a metal sheet flange area can be prevented from being wrinkled; S2, a first power module is used for supplying a current to the forming coil, and the powered-on forming coil generates a pulsed magnet field at a metal sheet area; a second power module is used for supplying a current to the metal sheet, so that a pulse current is generated in the metal sheet; and the pulse current and the pulsed magnet field act with each other to generate electromagnetic force used for driving the metal sheet to be subjected to high-speed deformation; and S3, the metal sheet to be formed can be deformed through the electromagnetic force. According to the electromagnetic pulse forming device and method, in the mode of directly loading the currents, the current magnitude in the metal sheet can be increased obviously, the influence on the current magnitude by electrical resistivity is small, and the problem of being insufficient in forming force due to the fact that the induced eddy current of a low electric conductivity material is small can be effectively solved.