70results about How to "High yield limit" patented technology

The invention discloses a technology for manufacturing a hotly-spun pressed forged steel single-piece piston with an inner cooling oil cavity, which comprises the following steps of: forging piston blanks; mechanically processing the piston blanks to obtain the piston as a semi-finished product with an inside part of the inner cooling oil cavity and a covering part for blocking the inner cooling oil cavity, heating the covering part and downwardly spinning the covering part of the inner cooling oil cavity in the piston by the hot spinning technology to contact the inside part of the inner cooling oil cavity to form a complete inner cooling oil cavity; and not processing gaps of the inside part and the covering part of the inner cooling oil cavity, remaining the gaps or simply sealing by the general welding technology, such as argon arc welding and the like, and precisely processing into the piston as a finished product. The hotly-spun pressed forged steel single-piece piston with the inner cooling oil cavity manufactured by the technology disclosed by the invention is simple in structure, relatively easy and convenient to manufacture, high in production efficiency and low in manufacturing cost, and can meet the requirements of an engine on high power, high strength, and low emission, and the like.

The invention relates to a heat-resistant aluminum-alloy conductor material for cables and a manufacture method thereof. The aluminum-alloy conductor material is prepared from the following components in percentage by weight: 0.3-1.0 percent of Fe, 0.01-0.3 percent of Cu, 0.01-0.3 percent of Mg, 0.01-0.3 percent of one, two or three of Mg, Ca, Mo and Sb and 0.05-0.8 percent of one or more rear-earth elements of Sc, Y and Er, not larger than 0.1 percent of Si, not larger than 0.15 percent of other impurities and the balance of Al. The aluminum-alloy conductor material has excellent conductivity, tensile performance, flexible performance and excellent heat resistance, can be used as insulated cable cores of wires and cables and is particularly suitable for overhead insulated conductor wire cores.

The invention discloses a manufacturing process of a solid cold-spun forged steel piston with an internal cooling oil chamber. The manufacturing process comprises the following steps: performing solid forging to obtain a piston blank; machining a semi-finished piston product with an inside part of the internal cooling oil chamber and a shielding part for blocking off the internal cooling oil chamber; then heating the shielding part, and spinning downwards the shielding part of the internal cooling oil chamber of the piston by adopting the hot spinning process so that the shielding part contacts with the inside part of the internal cooling oil chamber so as to form the complete internal cooling oil chamber; and reserving the gap between the inside part and the shielding part of the internal cooling oil chamber and the shielding part without disposal or simply closing the gap by argon-arc welding and other common welding processes, and then performing precision machining to finally obtain the finished piston. The manufacturing process has the advantages of simple structure, more simple and convenient manufacturing procedures, high production efficiency, low manufacturing cost and the like, and can meet the requirements of an engine on high power, high strength and low emission.