30results about How to "Equivalent hardness" patented technology

The invention relates to a low-cost, high-strength, high-toughness and high-abrasion resistance alloy steel and a preparation method thereof. The invention belongs to the technical field of preparation technologies of special alloy steel. The alloy steel comprises the following elements by weight percent: 0.88-1.10% of C, 0.45-0.65% of Si, 0.20-0.50% of Mn, 7.50-9.0% of Cr, 1.30-1.80% of Mn, 0.30-0.60% of V and the balance of Fe. The preparation process comprises the following steps: (1) preparing materials and melting by using the conventional method, wherein the melting temperature is 1500-1550 DEG C; (2) carrying out electro-slag re-melting; (3) annealing after the electro-slag re-melting; (4) forging; (5) annealing after the forging, and annealing at the temperature of 850-880 DEG C for 8 hours; (6) carrying out shpheroidizing annealing to 860-550 DEG C; and (7) carrying out the heat treatment technology, adopting the low temperature quenching and low temperature tempering or high temperature quenching and high temperature tempering technology for carrying out heat treatment, and finally preparing the high-strength, high-toughness and high-abrasion resistance cold-working die steel. The hardness of the die steel is 62-63HRC and the average impact toughness is 80J. Compared with the imparted steel, the alloy steel has the equivalent hardness and toughness, and can completely replace the imported high-strength, high-toughness and high-abrasion resistance cold-working die steel.

The invention discloses a metal-matrix composite ceramic liner plate. Zirconia aluminum oxide, high chromium iron powder and iron powder are electrically smelted and injected into a metal-matrix ceramic reinforcement with a plurality of communicated plug holes to form the metal-matrix composite ceramic liner plate; the upper and lower end faces of the metal-matrix ceramic reinforcement are provided with communicated plug holes, and four side faces of the metal-matrix ceramic reinforcement are provided with communicated grooves; after different reinforcements are spliced, grooves on edges of two adjacent reinforcements form complete plug holes, a metal liquid is poured into the plug holes and can infiltrate among ceramic particles of the reinforcements through the plug holes and uniformly coat the ceramic particles, so that a ceramic phase and a metal phase are uniformly distributed. Therefore, the toughness and wear resistance of the finished ceramic products are enhanced, and the thermal shock resistance of the finished ceramic products is improved.

The invention belongs to the field of preparation of special composite coatings, and particularly relates to a high-entropy alloy composite large-particle tungsten carbide composite coating as well asa preparation method and application thereof. The composite coating is composed of a high-entropy alloy and tungsten carbide, wherein the tungsten carbide contains large-particle tungsten carbide, and the particle size of the large-particle tungsten carbide is 75-150 microns. The preparation method comprises the steps that high-entropy alloy powder and the large-particle tungsten carbide are prepared according to a set proportion; and the high-entropy alloy / the large-particle tungsten carbide is prepared through a laser cladding and rapid cooling method. The preparation process of the high-entropy alloy composite large-particle tungsten carbide composite coating is adopted, the high-entropy alloy / the large-particle tungsten carbide composite coating is prepared while protection matrices and the large-particle tungsten carbide are not damaged, so that the uniform distribution of the large-particle tungsten carbide particles in the composite coating is achieved, and various types of large-particle tungsten carbide particles and various types of laser cladding equipment are suitable.

The invention discloses a method for restoring surface defects of a casting machine after machining, which comprises the following steps: painting a copper plating protection layer on the surface around the defect on the surface of the casting machine after machining and/or on the surface of the defect; then resurfacing welding the defect to cause a defect repair welding point to be higher than the surface of the casting machine; and carrying out plane milling and/or grinding processing at the part of the repair welding point higher than the surface of the casting machine until the repair welding point has the same process dimension with the surface of a basal body. The process is a composite type restoring technique expanded on a common restoring process, and the repair welding point is well combined with a parent material, has equivalent rigidity with the parent material, and has the basically same color and luster with the parent material. The method not only avoids the hazards of part deformation, cracking and the like easily caused by singly adopting an argon arc welding method, but also avoids the problems of long restoring time, weak combination with the parent material and the like caused by singly adopting an electric brush plating method.

The invention discloses a preparation method of a carbon nanotube enhanced copper-based composite material. The preparation method comprises the following steps: uniformly adding MWCNTs (Multi-walledCarbon Nanotubes) between copper foils; carrying out an SPS (Spark Plasma Sintering) and cold rolling technology to obtain a laminar MWCNTs/Cu composite material thin belt. The relative density of anobtained MWCNTs/Cu composite material is 94.3 to 98.6 percent. Compared with a traditional powder SPS MWCNTs/Cu composite material, the resistivity is reduced by 10 percent to 16 percent and the yieldstrength is equivalent.

The invention relates to steel pipe annealing equipment and a steel pipe annealing technology. The steel pipe annealing equipment comprises the following technological processes: A. conveying a steel pipe to a feeding roller table through an alignment device, and conveying at the speed of 16-27m/h; B. enabling the steep pipe to enter a thermal treatment furnace via an inlet sealing box and carrying out closed heat treatment on the steel pipe, and continuing to move the steel pipe forwards in the thermal treatment furnace at the speed of 16-27m/h, wherein the steel pipe orderly passes through a first heating area, a second heating area, a third heating area, a fourth heating area and a heat preservation area inside the thermal treatment furnace; the heating temperatures of the first heating area, the second heating area, the third heating area and the fourth heating area are orderly increased, and the thermal treatment furnace is filled with protective gas in the closed thermal treatment process; C. slowly cooling the steel pipe by a cooling box adopting circulating cooling water to cool after the steel pipe is discharged from the thermal treatment furnace; and D. enabling the steel pipe to enter an aggregate area through an outlet sealing box to finish the overall process after the steel pipe is discharged from the cooling box. By adopting the technology, the inner stress of the material after pipe welding can be removed, the steel pipe is uniform in hardness, high in tensile strength and high in ductility, the yield strength is reduced, and the steel pipe is flexible.

The invention discloses a locomotive-buffer-bar surface repairing and remanufacturing method. The locomotive-buffer-bar surface repairing and remanufacturing method includes the following steps that S1, repairable to-be-repaired buffer bars are screened out; S2, the abrasion loss of the to-be-repaired buffer bars is checked, to-be-repaired areas are determined on different-radius shaft segments ofthe buffer bars according to the size of the abrasion loss respectively, and to-be-repaired grooves are processed in the to-be-repaired areas; S3, the to-be-repaired buffer bars are sequentially subjected to sand blasting, cleaned and preheated; S4, one ends of the to-be-repaired buffer bars are fixed on a displacement device, and the to-be-repaired grooves are subjected to continuous annular welding through a CMT automatic welding system to complete repairing of the to-be-repaired buffer bars; S5, the repaired buffer bars obtained in the step S4 are welded to be subjected to slow cooling treatment; S6, the repaired areas of the repaired buffer bars are machined according to the size of an original-buffer-bar drawing, and then whole sand blasting is carried out. The locomotive-buffer-barsurface repairing and remanufacturing method is low in cost, high in efficiency and high in repairing quality, and the buffer bars after being repaired and remanufactured with the method can reach thequality standard of a new buffer bar.

The invention discloses high-performance powder metallurgy pressing sintering type semi-high-speed steel and a preparation method thereof. Preparation of the high-performance powder metallurgy semi-high-speed steel is achieved by adopting carbonyl iron powder and carbide powder as raw materials through the processes of ball-milling mixing, cold pressing forming, thermal degreasing, vacuum sintering and the like. The prepared semi-high-speed steel is uniform in chemical component, fine in grain and capable of achieving overall dispersion distribution of carbides, the problems such as componentsegregation and thick carbides existing in a traditional casting method are avoided, and the strength and the toughness of the material are significantly improved. The high-performance powder metallurgy pressing sintering type semi-high-speed steel has the advantages that the technological process is simple, the production cost is low, and the components are easy to control. Compared with semi-high-speed steel prepared through a casting method, the semi-high-speed steel has the advantage that the bending strength and the impact toughness are obviously improved at the same compactness.

The invention provides a rubber compound additive particle, and belongs to the technical field of rubber. The rubber compound additive particle comprises, by weight, 20-30 parts of rubber, 5-8 parts of zinc oxide, 3-5 parts of stearic acid, 4-6 parts of anti-aging agents, 0.5-1 part of scorch retarders, 3-5 parts of accelerators and 2-4 parts of vulcanizing agents. The particle is cylindrical, thediameter of the particle is 2-5mm, and the height of the particle is 5-10mm. The rubber compound additive particle has functions of activating agents, the anti-aging agents, the accelerators, the vulcanizing agents and the scorch retarders, a small number of additives are used, the same effects can be achieved as compared with a traditional production process, the multifunctional rubber compoundadditive particle is a colloidal particle, on one hand, dispersion effects of various rubber additives in rubber can be effectively improved, on the other hand, matching is facilitated, weighing errors are reduced, environmental pollution caused by dust in production is decreased, and physical health of operators is facilitated.

The invention relates to a friction stir butt welding device for a large-thickness titanium-nickel dissimilar material and a machining method of the friction stir butt welding device. The friction stir butt welding device comprises a workbench and a friction stir welding mechanism, the workbench comprises a fixed clamping device, the friction stir welding mechanism comprises friction stir weldingequipment, the output end of the friction stir welding equipment comprises a stirring head, and a gas protection mechanism is arranged at the stirring head; the friction stir butt welding device further comprises a laser output mechanism, the laser output mechanism comprises a plurality of second laser output mechanisms arranged on the upper portion of the gas protection mechanism; and a hollow placement groove is formed in the stirring head. By arranging the laser output mechanism, the gas protection mechanism or a current heating mechanism in the stirring head of conventional friction stir butt welding equipment, the problem of insufficient softening of the bottom of a to-be-welded area only during surface laser heating is solved, and the axial pressure of the stirring head in the welding process can be greatly reduced.

The invention provides high-gamma-aminobutyric acid high-dietary-fiber noodles. The noodles have effects of improving intelligence, intestinal functions and the like, and have equivalent hardness, elasticity and cohesiveness with commercial common fine dried noodles. Furthermore, the invention provides a preparation method of the noodles. According to the preparation method, the taste of noodles can be improved by means of super-fine comminution; by means of germination, endogenous enzyme transformation, super-fine comminution and enzyme hydrolysis composition, the content and utilization of gamma-aminobutyric acid and water-soluble dietary fibers can be improved, the content of nutritional factors can be reduced, and the effect can be improved; and the noodles are prepared by utilizing raw stock of germination, so that tenacity and chewing performance of the noodles can be improved, the taste and flavor are good, and the nutritional digestive absorption rate of the noodles can be improved.

The invention provides triarrhena lutarioriparia mushroom shoot noodles. The triarrhena lutarioriparia mushroom shoot noodles comprise the following components in percentages by weight: 90%-93.5% of wheat flour, 3%-5% of triarrhena lutarioriparia mushroom powder, 2%-3% of triarrhena lutarioriparia shoot powder, and 1.5%-2% of edible salt. The noodles provided by the invention use the natural edible fungus triarrhena lutarioriparia mushrooms as one raw material, the triarrhena lutarioriparia mushrooms can provide edible fungus polysaccharides, and the noodles have the functions of improving immunity and strengthening physiques, and have a natural umami taste; and a culture material of the triarrhena lutarioriparia mushrooms is triarrhena lutarioriparia stalks, so that the method has no problems such as pesticide residues, and has the advantages of health and environmental protection.

The invention discloses a flywheel rotor and a preparation method thereof, and relates to the technical field of rotor energy storage. The flywheel rotor is made of high-strength steel, the high-strength steel is subjected to electric arc furnace smelting, external refining, electroslag remelting, controlled forging, normalizing, quenching and tempering, the yield strength ranges from 1150 MPa to 1700 MPa, the room-temperature V-shaped notch impact energy is larger than 27 J, the method is suitable for manufacturing an energy storage disc type flywheel rotor with the outer diameter being 600-2000 mm and the maximum height being smaller than or equal to 600 mm or a cylindrical flywheel rotor with the diameter being smaller than or equal to 1000 mm.

A rubber composition comprising 1 to 10 parts by weight of an organic peroxide crosslinking agent having a one-hour half-life temperature of 110 to 130° C., based on 100 parts by weight of an ethylene-butene-non-conjugated diene copolymer. The ethylene-butene-non-conjugated diene copolymer can be used by being blended with EPDM in an amount of 50 wt % or less in the total amount of the ethylene-butene-non-conjugated diene copolymer and EPDM. A sealing material for fuel cell separators comprising a crosslinked molded article of the rubber composition has, in addition to functions required as a sealing material for separators, improved low temperature sealing properties.