623results about How to "Uniform hardness" patented technology

A bedding or seating product comprising a spring assembly made up of a plurality of parallel strings of springs joined to each other. Each of the strings of springs comprises a row of interconnected pocketed coil springs. Selected pockets of fabric are shorter than adjacent pockets, so coil springs in the selected pockets are under a greater load than adjacent coil springs. In one preferred embodiment, every other pocket is under a greater load than the adjacent pockets, resulting in a checkerboard arrangement in at least one area of the product.

The invention provides an electric pressure cooker control method which comprises the following steps that an electric pressure cooker is controlled to heat with first power; when a first preset condition is met, a pressure valve is opened, so that air is discharged; the electric pressure cooker is controlled to heat with second power until the temperature in the electric pressure cooker is stable and food in the electric pressure cooker is made to be turned over completely; the pressure valve is closed and the electric pressure cooker is controlled to heat with third power, so that the electric pressure cooker enters a boosting stage, and the third power is smaller than the first power and the second power; when a second preset condition is met, the electric pressure cooker is controlled to heat with fourth power, so that the electric pressure cooker enters a pressure maintaining stage. According to the electric pressure cooker control method, the cooked food is complete, moisture is sufficient, the hardness is even, the taste is good, and the cooked food is prevented from pasting the bottom of the cooker and overflowing out of the cooker. The invention further provides the electric pressure cooker.

The invention relates to a wear-resistant crosslinked PE (Polyethylene) composite pipe and a manufacturing method thereof, belonging to the technical field of PE pipes. The composite pipe is obtained by fusing, extruding and pelletizing 100 parts of PE, 1-3 parts of scratch-resisting agent, 0-10 parts of carbon fiber, 0-5 parts of elastomer, 0.05-0.2 part of antioxidant, 0.2-1 part of crosslinkedaccelerating agent and 0.5-1 part of lubricating agent with double screws, performing vacuum drying, spraying a silane crosslinking agent and extruding by an extruder. By adopting a chemical modification method, the connection of a PE molecular chain is enhanced, a three-dimensional network structure is formed, and the creep resistance and surface solid particle impact resistance of a material are enhanced. By adopting a physical modification technology, the scratch-resisting agent and a reinforcing agent are compounded in a PE material, a PE crosslinked composite material with balanced toughness, strength and hardness is obtained, the wear resistance, heat resistance, tensile strength and elongation percentage of PE are enhanced, and the PE pipe is suitable for conveying powder, solid particles and slurry and has wide market prospect.

A high-strength and high-toughness antiwear quasi-bainite rail for switch contains C (0.1-0.4 wt.%), Si (0.8-2.0), Mn (0.8-3.3), Cr (0-2.0), Mo (0.1-0.8), N (10-150 ppm), Al (0-0.005) and Fe (rest), and is made up through smelting in converter, reinfing, treating with RE, vacuum degassing, conticasting, rolling, air cooling to 400 deg.C, slow cooling to 200 deg.C and natural cooling. Its advantages are uniform hardness in cross section, high strength, toughness and stability, and high antiwear performance.

The present invention relates to heat treatment, and is especially internal and external bearing ring quenching process and quenching press. The quenching process includes the steps of mounting and heating, feeding quenching material, simultaneous quenching of the internal bearing ring and the external bearing ring, and discharging. The special quenching apparatus includes internal bearing ring quenching apparatus, external bearing ring quenching apparatus and manipulator for grabbing the outer bearing ring. The external bearing ring quenching press is provided with fixing mold, the internal bearing ring quenching apparatus is provided with expanding mold, and the quenching process is one closed immersing process. The present invention has homogeneous quenching and is suitable for batch heat treatment.

The invention relates to quenching and tempering type wear resistant steel and a heat treatment method thereof. The steel comprises the following chemical components by weight percentage: less than or equal to 0.22 percent of C, less than or equal to 0.80 percent of Si, less than or equal to 1.60 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.60 percent of Ni, less than or equal to 1.00 percent of Cr, less than or equal to 0.50 percent of Mo, 0.02 to 0.03 percent of Nb,0.04 to 0.06 percent of V, 0.020 to 0.045 percent of Al, 0.015 to 0.030 percent of Ti, less than or equal to 0.004 percent of B, and the balance being Fe and unavoidable impurities. The steel plate has reasonable obdurability matching, proper hardness, even full-thickness hardness and the mechanical properties reaching the expected design requirements. The steel plate production process has easy operation and high adaptability. The steel plates of various batches have stable and even performance and can reach the requirements for volume production. As the tempering time in a quenching machine is longer, the tempering time can be appropriately shortened in the subsequent production through tests, thereby reducing the cost.

The invention discloses a fabrication process of hexagonal flange toothed bolt. In the fabrication process, medium carbon cold heading steel wires are used. The fabrication process mainly comprises the steps of: (1) shearing blanking; (2) preliminarily heading; (3) pressing to form a circular top; (4) pulling to produce a hexagonal product; (5) molding; (6) thread rolling; (7) heating; and (8) electroplating. In the fabrication process of hexagonal flange toothed bolt disclosed by the invention, the cold heading forming technology is adopted to carry out processing, thus the material utilization rate is over 98%, the material is saved, the cost is reduced; by the use of multi-position extrusion, the volumetric deformation and metal flow are more reasonable, fins produced in deformation process are removed, and the resistance to deformation is reduced; by undergoing thermal processing, the bolt has uniform grain and hardness, and is free of cracks; the qualification rate is up to 100%; by electroplating cadmium and titanium, the strength of the bolt is greatly improved, as well as the safety in use.

The invention relates to a multipurpose all-austenite low-density steel and a preparation method thereof, and belongs to the technical field of metal materials and preparation thereof. The steel comprises the following chemical components of, by weight, 0.40%-0.90% of C, 15.0%-25.0% of Mn, 3.0%-6.0% of Al, 0.3%-0.80% of Mo, 0.3%-0.90% of V, 0.01%-0.04% of Ti, 0.02%-0.10% of Nb, less than or equalto 0.3% of Si, less than or equal to 0.03% of P, less than or equal to 0.002% of S, less than or equal to 0.006% N (60 ppm), and the balance Fe and inevitable impurities; the density is 7.0-7.4 g/cm<3>, and the structure type is a total austenite + nano-scale VC and an MoC precipitation phase; and the composition system is characterized in that uniform and stable all-austenite steady-state structure can be obtained through casting and controlled rolling and controlled cooling technologies. The steel and the method are suitable for various fields of automobiles, buildings, mechanical structuresand the like.

A compound rolling heat treatment process of rapid-steel belongs to the steel rolling technology field. The invention comprises conducting annealing treatment for roller with 870-890 DEG C of annealing temperature, warming up for 6-10 hours, proceeding induction quenching on a 50Hz/250Hz double-frequency quenching machine, preheating the roller before the induction quenching with 280-350 DEG C of preheating temperature for 6-10 hours of preheating warming. The roller is need being rotated and shifted down perpendicularly along axial direction when in quenching heating. The roller is water-cooled fast after heated up, then is conducted the first tempering treatment with 520-560 DEG C, and is insulated tempering for 4-6 hours, and then is cooled down in air. The roller is reheated to 500-540 DEG C to finish the second tempering treatment, and is insulated tempering for 6-8 hours, and is cooled down when the temperature of furnace is cooled smaller than 200 DEG C. The heat treatment technology of the invention treats high speed steel compound rolling, has simple technology, low energy consumption, short production cycle, high rolling strength and excellent use effect, and has excellent economic and social benefits after being popularized and applied.

The invention discloses a manufacturing technology and device for an improved forged steel roller neck high nickel chrome molybdenum alloy cast composite roller. The roller comprises, by mass percent, 3.0%-3.6% of C, 0.60%-1.20% of Si, 0.30%-1.20% of Mn, 3.0%-5.0% of Ni, 1.0%-2.0% of Cr, 0.40%-1.2% of Mo, 0.1%-2% of W, 0.5%-1.0% of Cu, not larger than 0.05% of P, not larger than 0.03% of S, 0.04%-0.06% of Mg, 0.1%-0.3% of Nb, 0.1%-0.30% of Ti, 0.2%-0.6% of V, 0.05%-0.2% of B, 1.5%-2.5% of Ba, 1%-2% of Ca, 1%-3% of Sb, 0.02%-0.18% of N, 1.0%-2.0% of Y/RE and the balance Fe and inevitable micro elements. Yttrium base rare-earth nodulizing and Ba, Ca, and silicon iron composite inoculation are adopted, Nb, Ti, V, B and Sb are added for modification, and the mechanical performance of the roller is improved; by the adoption of the forged steel roller neck, the strength of the roller is improved, an induction heater is adopted to carry out in-mold whole heating casting on a core stick, a water cooled crystallizer is molded, a composite layer interface can be dynamically controlled, the technology is simple, the efficiency is high, power consumption is small, the cost is low, no composition segregation exists, and the service life of the roller is long.

The invention relates to a laser bionic coupling guide rail and a regeneration method thereof. Bionic surfaces different in abrasion resistance are machined in a slight abrasion area and a serious abrasion area on the working face of the guide rail. A point and strip bionic surface combining form or a strip and net bionic surface combining form or a point and net bionic surface combining form is adopted according to the hardness gradient or the stress gradient of the serious abrasion area and the slight abrasion area of the working face of the guide rail. A bionic surface with the overall abrasion resistance being consistent for a long term is formed through the combination of the bionic surfaces different in abrasion resistance, the mechanical performance of the surface with the uneven mechanical performance distribution can be recovered to be evenly distributed, the phenomenon of serious local abrasion caused by large local stress is effectively avoided, and the bionic coupling guide rail is more suitable for the angle of the actual work of the bionic coupling guide rail. A multi-bionic coupling surface combined uneven regeneration repairing manner is directly implemented on the local abrasion surface of a cast iron guide rail on which high-frequency quenching is carried out, and the problem that due to the uneven abrasion of the surface of the scraped guide rail, the scraped guide rail is hard to regenerate is basically solved.

The invention discloses a wear-resistant material workpiece quenching medium, relating to the technical field of heat treatment quenching. The wear-resistant material workpiece quenching medium comprises following raw materials based on weight percentage: 6-12% of sodium hydroxide, 6-8% of zinc chloride, 0.01-0.03% of sulfonated castor oil, 1-5% of polyamide polyethylene glycol, 2-5% of acrylic acid, 5-10% of acrylic ester, 0.1-2% of additive and the balance of water. In the wear-resistant material workpiece quenching medium, formula is reasonable, a quenching piece can achieve high and uniform hardness and can be directly subjected to quenching, residual forging heat quenching and induced spraying quenching, and the medium is particularly applicable for quenching of a large workpiece; the sodium hydroxide used in the invention can mutually react with oxide skin on the surface of the quenching piece to generate oxygen, so that the oxide skin is rapidly stripped off, and the surface of the quenching piece shows shiny silver ; the zinc chloride and the sodium hydroxide react to generate strong zinc oxide, the scabbing speed of a high-temperature region is faster than that of water, the cooling speed of a low-temperature region is slower than that of the water, the quenching piece is slightly deformed, is not easy to crack and has a shiny surface.

Provided is a pot-shaped copper sputtering target manufactured with die forging, wherein the Vickers hardness Hv at all locations of the inner surface of the pot-shaped target is 70 or greater. With this pot-shaped copper sputtering target, the average crystal grain size in the target structure is 65 μm or less. Further, the inner surface of the pot-shaped target comprises crystalline orientations of (220), (111), (200), (311) obtained by X-ray diffraction, and the crystalline orientation of the face subject to erosion of the pot-shaped target is of a (220) primary orientation. An object of the present invention is to obtain a manufacturing method of a high quality sputtering target by improving and devising the forging process and heat treatment process to make the crystal grain size refined and uniform, and to obtain a high-quality sputtering target.

The invention relates to a laser cladding repair process for cross shafts. The process comprises the following steps of: A. carrying out treatment on the surface of the cross shaft, and carrying out failure analysis; B. carrying out 80-150 DEG C overall preheating on the cross shaft; C. according to failure analysis results of the cross shaft, optimizing process parameters, and carrying out laser cladding, wherein adopted alloy powder comprises the following components in percentage by weight: less than or equal to 0.1% of C, 10-13% of Cr, 1.5-2.5% of B, 1-2% of Si, 0.5-1.2% of Mo, 8-12% of Mn, 6-12% of W, 5-15% of TiO2, and the balance of Fe; and D. carrying out detection. According to the laser cladding repair process for the cross shafts, disclosed by the invention, through carrying out the laser cladding on the surface of the cross shaft, the size of the cross shaft can meet the application requirements, and the hardness and the wear resistance of the cross shaft subjected to repair exceed the original hardness and the original wear resistance of the cross shaft.

A sound insulation floor structure comprises a floor backing member, a floor finishing layer, and an intermediate layer between the floor backing member and the floor finishing layer, the intermediate layer comprising a buffer member comprising a nonwoven structure. The nonwoven structure comprises a thermal adhesive fiber under moisture which is melt-bonded to a fiber of the nonwoven structure to fix the fibers. For example, the sound insulation floor structure may comprise, in sequence, a floor backing member 1, a buffer layer 2, an air layer 3, a hard layer 4, and a floor finishing layer 5. In the floor structure, a support member 6 is disposed between the buffer layer 2 and the hard layer 4. The support member may occupy 10 to 70% of a floor area. The sound insulation floor structure prevents subsidence of a floor member due to walking, achieves comfortableness to walk, and has improved floor impact sound insulation.

The invention discloses ultrahigh-strength all-austenite low-density steel and a preparation method, and belongs to the technical field of metal materials and preparation thereof. The ultrahigh-strength all-austenite low-density steel comprises, by weight, 1.0%-1.6% of C, 25.0%-30.0% of Mn, 9.0%-13.0% of Al, 0.6%-1.0% of Mo, 1.0%-1.2% of V, 0.01%-0.04% of Ti, 0.02%-0.04% of Nb, less than or equal to 0.03% of P, less than or equal to 0.002% of S and less than or equal to 0.006% (60ppm) of N. And the balance of Fe and inevitable impurities are used for preparing raw materials. A uniform and stable all-austenite steady-state structure is obtained through casting, controlled rolling and controlled cooling technologies, and VC and MoC precipitated phases of 1-10 nanometers and a k phase of 10-50 nanometers are obtained on the basis of the stable all-austenite steady-state structure through the aging precipitation technology. The ultrahigh-strength all-austenite low-density steel and the preparation method are suitable for various fields of automobiles, buildings, engineering machinery and the like.