16 results about "Multiple pass" patented technology

This disclosure provides a process for preparing fine-grained nickel-titanium shape memory alloy rods for medical use, comprising: forging a heated nickel-titanium alloy ingot through multiple passes, performing multiple high-temperature continuous rolling passes, and then performing thermomechanical treatment to obtain fine-grained nickel-titanium shape memory alloy rods. This invention, through a combination of specific multi-pass forging and strictly temperature-controlled high-temperature continuous rolling, utilizes a robust dynamic recrystallization mechanism to fundamentally refine and homogenize the austenitic matrix grains, and completely breaks down the continuous brittle Ti2Ni phase distributed along the grain boundaries into a randomly dispersed distribution, thereby obtaining fine-grained nickel-titanium alloy rods with high purity and excellent microstructure. This solves the practical problems caused by the coarse grains and brittle phase segregation of the original cast nickel-titanium alloy, such as easy intergranular fracture, difficult processing and forming, low yield, and poor fatigue life in medical applications.

The invention discloses a preparation method of a loose body based on an optical fiber preform, and relates to the technical field of optical fiber processing. The method comprises the following steps: SS01, depositing a barrier layer by adopting an MCVD (modified chemical vapor deposition) process; sS02, multi-time deposition of a loose core layer is conducted through the MCVD deposition technology; sS03, preparing a doping solution containing rare earth ions and aluminum ions; sS04, off-line solution doping is carried out, and a vacuum pressurization alternate driving mode is adopted in the doping process. The porosity of the loose core layer is gradually reduced from inside to outside, a permeation resistance gradient is formed, the high porosity of the inner layer provides sufficient permeation channels, the low porosity of the outer layer plays a role of a barrier layer, rare earth ions are prevented from being adsorbed by the surface layer too early and exhausted in the doping process, and the rare earth ions are prevented from being adsorbed by the surface layer too early and exhausted through the forced permeation effect of vacuum pressurization alternate driving. Dissolved gas is discharged through vacuumizing operation after each stage of pressurization, space is vacated for next-stage permeation, and the rare earth ions are evenly distributed in the radial direction of the loose body.

The invention provides a method for regulating and controlling the average grain diameter of a copper-nickel alloy B30 flange forge piece, which comprises the following steps of: S1, blanking a bar billet: selecting a copper-nickel alloy BFe30-1-1 bar billet as a raw material of a flange forge piece to be manufactured, and blanking and cutting; s2, heating is conducted, specifically, the copper-nickel alloy BFe30-1-1 bar billet is heated; s3, upsetting and drawing forging is conducted, specifically, the heated blank is subjected to multi-pass drawing and upsetting in a free forging mode; the original blank is forged into a round cake shape matched with the die cavity through integral upsetting, drawing, cogging and forging; s4, die forging forming is conducted, specifically, the round-cake-shaped forge piece subjected to upsetting and cogging is placed into a corresponding die cavity, and die forging forming is conducted; and S5, annealing treatment. According to the method for regulating and controlling the average grain diameter of the copper-nickel alloy BFe30 flange forge piece, the obtained flange forge piece has high mechanical performance, corrosion resistance and the average grain diameter, and the average grain diameter ranges from 0.05 mm to 0.1 mm.

The application discloses a kind of based on crystallizer electromagnetic stirring bar surface inclusion control method, belong to steel metallurgy continuous casting and rolling technical field.The method first establishes the finite element model of multiple pass rolling process from continuous casting billet to target bar, and using node reverse tracking technology, the specific area of continuous casting billet that has decisive influence on bar surface quality is determined as target clean control area.Subsequently, the multi-physics field coupling model of flow, solidification and inclusion movement in crystallizer is constructed, and the installation position of crystallizer electromagnetic stirrer that can make the inclusion capture probability in target clean control area be reduced to the lowest is determined as the optimal process position by simulation analysis.Finally, electromagnetic stirrer is installed according to this position in actual continuous casting production and production is carried out.The application realizes accurate targeted control of cleanliness of key area of continuous casting billet from the requirement of final product quality, and significantly improves the surface quality and service performance of high fatigue requirement steel such as bearing steel.

The application discloses a kind of ultra-fine copper wire and its production method, belong to copper wire production technical field;The production method of ultra-fine copper wire provided by the application includes the following steps: (1) continuous casting and rolling copper pole: after electrolytic copper plate is melted, slag is removed and purified, copper liquid is obtained, then the copper liquid is continuously cast, and the casting blank is obtained, then the casting blank is continuously rolled, acid-free cleaning and waxing, and the copper pole is obtained;(2) continuous drawing and on-line annealing: the copper pole is drawn continuously through multiple passes, first large-diameter drawing, then medium-diameter drawing, on-line continuous annealing while medium-diameter drawing, then small-diameter drawing, and small-diameter copper wire is obtained;(3) micro-drawing and annealing: the small-diameter copper wire is micro-drawn to an average diameter of 0.03-0.05 mm and then annealed to obtain ultra-fine copper wire.The ultra-fine copper wire obtained by the production method provided by the application has a large weight when it breaks for the first time and a large elongation.

The present application belongs to the field of transition solid color paint coating technology of passenger cars, and provides a transition solid color paint coating method, which comprises: preparing multi-stage transition color paint, each stage of color paint being mixed from base dark paint and base light paint, wherein, from the first stage of color paint to the penultimate stage of color paint, the proportion of base light paint is increased in gradient; the base dark paint accounts for 50%-55% in the last stage of color paint; spraying is performed in segments from top to bottom along the vertical direction of the vehicle body in the order from deep to shallow color; the spraying coverage of each stage of color paint is set to a height, and wet-on-wet process is used for continuous spraying of multiple passes; transparent varnish is sprayed on the surface of the entire gradient color paint layer, and 4%-8% base dark paint is added to the varnish, and the transition solid color paint is obtained. The passenger car coated by the method of the present application has soft color transition and good overall coordination, and can meet the requirements of appearance indexes such as paint film gloss and orange peel degree.

This invention discloses a nonlinear compression system and method based on spatiotemporal beam splitting, belonging to the field of ultrashort pulse laser technology. The method utilizes a spatiotemporal beam splitting module to separate an initial ultrashort pulse laser into multiple sub-pulses in both spatial and temporal dimensions. These sub-pulses are then injected into a multi-pass cavity structure, causing spectral broadening in each sub-pulse as it passes through the nonlinear medium multiple times. The spectrally broadened sub-pulses are then superimposed through spatial and temporal beam combining, followed by dispersion compensation to obtain the compressed ultrashort pulse output. By controlling the spatiotemporal distribution of the pulse in the nonlinear medium, the peak intensity of a single sub-pulse during the nonlinear process is reduced, which is beneficial for achieving stable nonlinear compression under high-energy conditions.

This invention relates to the field of metal layered composite material preparation technology, specifically a rolling process for a layered molybdenum-copper composite material, comprising the following steps: short-pulse energy beam scanning treatment of the surfaces of the molybdenum and copper matrix materials to be composited, to construct a three-dimensional surface texture and form an amorphous / nanocrystalline activation layer on the surfaces of the molybdenum and copper matrix materials; depositing a barrier layer and a gradient functional layer with gradually changing composition on the surface of the activation layer under vacuum; stacking the treated molybdenum and copper matrix materials and vacuum encapsulating them, followed by multiple passes of warm rolling at a temperature between the recrystallization temperatures of copper and molybdenum to form the composite material; and subjecting the warm-rolled composite material to gradient cooling annealing with continuously varying spatial gradients. This invention, through high-vacuum flexible metal encapsulation, essentially isolates the composite interface from oxygen throughout the entire process from stacking, heating to rolling, effectively improving the reliability of the bonding.

The application discloses a steel open frame, which is a W-shaped structure integrally formed by rolling a steel material through multiple passes, and comprises a U-shaped clamping groove part, an opening support part and a support bottom part. The U-shaped clamping groove part comprises a clamping groove top, a clamping groove side wall and a clamping groove bottom, and the clamping groove bottom has a protruding part protruding towards the opening support part. The opening support part is arranged below the U-shaped clamping groove part and comprises a support top, a support side wall and a support bottom part for being connected with a support. The steel open frame has a simple cross section, is easy to form, has a light self-weight and has a strong bearing capacity. The steel open frame assembly is formed by matching the steel open frame with a special-shaped gasket, thereby forming a stable bearing structure.

A pump light assembly (1) for a disc laser comprises a focusing device including a concave mirror (2) configured to focus a pump light beam (5) onto an active medium (3) in the form of a laser disc arranged in a focus of the concave mirror (2). A deflecting device (4) disposed about a central axis (21) of the concave mirror (2) guides the pump light beam (5) along a multi-pass path by directing the pump light beam (5) between reflecting regions and deflecting regions (.1–.50). The deflecting device (4) comprises a plurality of planar mirror prisms (41) arranged on an outer circular line (42) and on at least one further circular line (43, 44) closer to the central axis (21). The reflecting regions direct the pump light beam (5) toward the concave mirror (2) via the active medium (3) to provide successive pump passes, and the deflecting regions redirect the pump light beam (5) to a subsequent region to maintain a predefined reflection sequence. The regions (.1–.50) are formed on the planar mirror prisms (41) and / or are realized by angled mirrors (45) configured for reflection and / or deflection, wherein the angled mirrors (45) are separate from each other and not part of the planar mirror prisms (41). The multi-line arrangement provides controlled optical path lengths and supports maintaining a desired pump beam focus distribution over multiple passes.

The present application relates to the field of building decoration waterproof construction technology, and discloses a bathroom waterproof construction, closed water verification and finished product protection closed loop control method, comprising the following specific steps: cleaning, leveling and drying treatment of the bathroom base layer to form a base layer surface suitable for waterproof coating adhesion; additional reinforcement is made on high-risk nodes such as doorways, inside and outside corners, pipe roots, floor drains and water supply points, and an extended waterproof area and an end visual humidity detection point are formed outside the doorway. Then, waterproof coating is applied in multiple passes, and at least one pass is identified for surface defects and repaired for re-inspection. After film formation, the first finished product protection state is switched and the first closed water test is performed, and the water level is observed or blocked for detection outside the doorway simultaneously; if qualified and no water leakage occurs, controlled construction of the protection layer is allowed, otherwise, the position is repaired and re-inspected. The second finished product protection state is switched during and after the construction of the protection layer, and the second closed water test is performed; after passing, the tiling or decoration process is handed over, and if unqualified, the protection layer is repaired and re-inspected. The present application solves the problems of bathroom waterproof node leakage, closed water and finished product protection disconnection, and subsequent construction damage to the waterproof layer.

In some implementations, a host system may perform a first training procedure to determine a first one or more signaling parameters associated with communicating signals between the host system and a memory device. The host system may provide, to the memory device, an alignment command to identify a phase relationship between a host system clock signal and a memory apparatus clock signal. The host system may perform, based on the phase relationship, a second training procedure to determine a second one or more signaling parameters associated with communicating signals between the host system and the memory device.

This invention discloses a method for improving the rolling efficiency and surface quality control of four-ribbed steel bars. The method includes preparing special roller rings for the finished product hole and pre-finishing hole of the four-ribbed steel bars, and installing the prepared roller rings on the cantilever shaft of the finishing mill. The steel billet is heated in a furnace, and after exiting the furnace, it is descaled using a high-pressure water descaling device. The descaled steel billet sequentially enters the roughing mill and intermediate mill for multiple passes of diameter reduction and elongation. The rolled sections from the roughing and intermediate mills enter the finishing mill for rolling into four-ribbed steel bars. The cooling water volume is adjusted so that the surface temperature of the steel bar at the cooling bed inlet rises to 650-700℃, generating a dense Fe3O4 oxide film. After controlled cooling, the multiple-length steel bars are segmented by a multiple-length flying shear and conveyed to the cooling bed, where they naturally cool to room temperature. This method has advantages such as extending the life of the roller rings, reducing production costs, and significantly improving rolling stability and product surface quality.

The utility model discloses an anti -interference leakage current detection device, including leakage current detection instrument, BNC adapter plate, relay board, connector adapter plate and control panel, wherein, leakage current detection instrument is used for gathering leakage current data, BNC adapter plate connects leakage current detection instrument, is used for with 1 way BNC divides into multichannel BNC, relay board connects BNC adapter plate and connector adapter plate, is used for controlling the multichannel BNC output of BNC adapter plate to connector adapter plate, the conversion between multichannel BNC and serial port for connector adapter plate, and serial port is used for connecting the product of measuring, and control panel connects relay board, and can according to the each pass switch of relay board of external host computer control signal control, realizes the combination of multiple pass. The utility model discloses through realizing the signal free combination of each pass, effectively weakens the influence of electromagnetic interference signal to the detection process, avoids the deviation of detection result due to interference.

The present application relates to the field of alloy forging, in particular to a kind of 7XXX series aluminum alloy blank forging method and plate for aircraft structure.The method provided by the present application comprises the following steps: 7XXX series aluminum alloy ingot is subjected to 1 wide upsetting deformation and 7-12 passes of thick drawing, to obtain blank;The reduction of the ingot subjected to wide upsetting deformation is 20%-40%, and the reduction speed is not more than 4mm / s;The thickness of the ingot is reduced by 10%-15% after each pass of thick drawing, and the reduction speed is not more than 4mm / s;The drawing feed of the ingot subjected to thick drawing is 10%-20% of the initial total length of feed.The method of the present application distributes each parameter of the forging process, transmits strain from the core of the ingot to the surface through the drawing deformation of multiple passes, and realizes uniform distribution in the thickness direction of the ingot, finally ensures that the surface of the plate has consistent grain structure and uniform mechanical properties with the core.

This invention discloses a simulation device and method for high-throughput multi-pass stamping forming process of sheet metal, relating to the field of material plastic processing control. It includes a multi-head upper stamping die, a multi-hole lower stamping die, a stamping die, and a pressure-displacement acquisition system. The multi-head upper stamping die has multiple stamping die heads of different heights and diameters. The multi-hole lower stamping die has stamping die grooves corresponding to the stamping die heads. The stamping die has through holes for the stamping die heads to pass through and is connected to the upper die via a compression spring connecting rod. The pressure-displacement acquisition system is used to collect pressure and displacement data during the stamping process. By acquiring high-throughput experimental data under multiple working conditions and multiple passes, the system can not only build a comprehensive and reliable basic database for sheet metal stamping forming processes but also verify multi-pass stamping forming results under different process parameters in batches, thereby quickly selecting the optimal stamping forming process parameters.