34results about How to "Less organizational defects" patented technology

The invention relates to a hot metal gas forming and quenching system. The system involves a hydraulic machine, a die assembly, a rapid heating module and a rapid cooling module, wherein the die assembly comprises a progressive die, and hot gas forming and rapid cooling of a workpiece can be achieved. The invention further provides a hot metal gas forming and quenching process. The hot metal gas forming and quenching system has the following advantages that 1, a pipe is manufactured by adopting an uncoated plate, so that the cost is lower, and the structure defects and the process risk are less than those of a pipe made of a coated and plated metal plate; 2, the progressive die is adopted, a resistance heating procedure and a hot gas forming and quenching procedure are achieved at the sametime in parallel, and progressive feeding is adopted, so that the takt is fast, and the efficiency is greatly improved; 3, the heating state of a part is protected in the whole process, oxidation isprevented, a coating is not needed, and the workpiece can be directly welded to a vehicle body without shot blasting after being formed, so that the cost is greatly saved; and 4, safety protection measures with directional damage are adopted, so that the safety is improved.

The invention discloses a preparation method of an electrified railway chromium-zirconium-copper contact line. Copper is taken as a substrate, 0.30-0.70% of Cr and 0.10-0.35% of Zr in percentage by weight are added into the substrate, and the total sum of impurities is no greater than 0.05%. The preparation method comprises the following steps: performing vacuum melting and vacuum horizontal continuous casting, thereby obtaining a long-length large cross section chromium-zirconium-copper continuous cast blank; performing full hot continuous rolling and on-line solid solution, thereby obtaining a long-length chromium-zirconium-copper line rod disc; drawing and peeling the disc, and performing cold continuous rolling, thereby reducing the diameter; further performing aging treatment to reinforce the disc; further performing cold continuous rolling by using a Y-type rolling machine, thereby pre-forming the line; and finally performing fine drawing formation once. The chromium-zirconium-copper contact line produced by using the preparation process is fine and uniform in grain, free of defect, high in strength, high in conductivity and high in softening temperature, and applicable to industrialized production.

The invention discloses a method for carbonitriding on a stainless steel surface. By quenching and tempering and ion implanting of rare earth elements on the stainless steel surface, the temperature,carbon potential and ammonia flow rate in a carbonitriding process can be fully controlled. A thickness and a microstructure of a carbonitriding layer on the stainless steel surface can be effectivelycontrolled, and stainless steel products with high strength, high hardness, good wear resistance and excellent fatigue resistance can be obtained. The method for carbonitriding on the stainless steelsurface has the good advantages of short production cycle, simple method and high production efficiency and can be applied to industrial production.

The invention relates to a high abrasion-resistant hard alloy. The high abrasion-resistant hard alloy is prepared by mixing, granulating and sintering of raw materials of, by weight, 83-90 parts of WCpowder with the fisher particle size being 1.2-2.0 [mu]m, 10-17 parts of Co powder with the fisher particle size being 0.6-1.0 [mu]m, 0.7-1.0 part of B powder and 0.2-1.0 part of C powder. Accordingto the prepared high abrasion-resistant hard alloy, B and C are added in the raw materials and se rve as crystal material inhibitors, crystal material refining of the alloy structure is guaranteed, and abrasion resistance of prepared bar materials is enhanced effectively.

A 3D printed powder material, the powder includes a mixture of sintered WC-Co cemented carbide spherical particles and tungsten carbide particles as a wear-resistant phase, and a Co-based alloy as a bonding phase; the weight percentage of the wear-resistant phase It is 20%-60%, the weight percentage of binder phase is 40%-80%; the weight percentage of sintered WC-Co cemented carbide spherical particles is 5%-15%, coarse grain or single crystal tungsten carbide The weight percentage of the particles is 15-45%; it can effectively avoid or delay the failure period, and improve the wear resistance and work efficiency of the material.

The invention relates to an aluminum-based composite material, in particular to a high-strength anti-fatigue in-situ nano-strengthened aluminum alloy and a die-casting method thereof. Die castings are obtained through in-situ nano-strengthening and alloy composition regulation, combined with an optimized nonlinear high-pressure die-casting process. In situ nano-ZrB 2 Reinforcement and Nano-Al 3 The scale effect, interface effect and heterogeneous nucleation effect of Er precipitates significantly improve the strength, fatigue resistance and damping performance of the alloy; at the same time, the content of Mg, Zn and Fe elements is increased, and Mn and Ni elements are introduced, While increasing the content of the strengthening phase and obtaining high strength, the harmful coarse precipitation phases such as Al-Fe are effectively refined and rounded, and the good die casting performance of the alloy is guaranteed; thus, the alloy and the die casting method of the present invention are used to produce the alloy. The components show high strength plasticity, high fatigue resistance, high damping performance and good die casting performance.

A casting method by continuous directional solidifying includes extending one end of drawing line or plate in crystallizing mouth, extending its another end is cooling liquid, preheating the crystallizer, pouring fluid material in the crystallizer, insulating for directional solidifying, and drawing said drawing line or plate to draw the solidified material in cooling liquid. Its apparatus is composed of crystallizer, drawing line or plate, cooling unit, drawing unit and check unit. Its product (wire or plate) features high quality and uniformity, and excellent performance.

The invention relates to a novel valve-regulated lead-acid battery for electric vehicles, a novel valve-regulated lead-acid battery for electric vehicles in the battery, which is characterized in that the negative grid in the lead-acid battery uses a quaternary alloy, Ca 0.06‑ 0.09%, Sn 1.0‑1.2%, Al 0.015‑0.035%, Pb complement; the positive grid uses a quaternary alloy, Ca 0.06‑0.09%, Sn 0.5‑0.7%, Al 0.015‑0.035%, Pb complement. The invention also includes the limitation on the composition and content of the lead paste of the positive and negative plates, and the preparation of the lead-acid storage battery. The invention fundamentally solves the problems of the consistency of batteries used in groups and the service life of deep cycles.

The invention relates to a magnesium-aluminum-zinc wrought magnesium alloy containing calcium and rare-earth samarium. The wrought magnesium alloy comprises the following components by mass percent: 5.3% to 6.0% of Al (aluminum), 0.7% to 1.0% of Zn (zinc), 0.4% to 0.5% of Ca (calcium), 0.2% to 1.5% of Sm (samarium), less than or equal to 0.15% of inevitable impurities and the balance of Mg (magnesium), wherein all the components taken as raw materials in proportion are fused and rapidly cooled in a salt bath; an obtained alloy spindle is annealed in a homogenization manner at 400 DEG C and air-cooled to reach a room temperature; then the hot extrusion is carried out on the alloy spindle at 360 DEG C according to the extrusion ratio being 25:1, so that the magnesium-aluminum-zinc wrought magnesium alloy containing the calcium and the rare-earth samarium is obtained. After the thermal deformation is carried out on the magnesium alloy, the tensile strength and the yield strength of the magnesium alloy are improved. Thus, the foundation for actual production applications of the wrought magnesium alloy is laid.

The invention discloses a manufacturing method and application of nano-intermetallic compound dispersion strengthened copper alloy. The composition and mass percentage of the copper alloy are as follows: Sn: 4-8%, Ni: 1.5-4%, Ag: 0.05-0.6%, rare earth elements : 0.07~0.2%, Zn: 1.48~2.43%, X: 3.52~7.57%; wherein, X is any one or more of Al, Mn, Sc, B; rare earth elements include at least Ce, La and Y; The mass percentage of rare earth elements and Sn is 1:(40~55); the mass percentage of Ce, La and Y is (0.2~0.5):1:(0.1~0.35), and the balance is Cu. The copper alloy can be used in friction discs of high-speed train motor rotors. The copper alloy of the invention has good wear resistance and electrical conductivity.