30results about How to "Achieve high strength" patented technology

The present invention relates to a mechanical part, which is obtained by: processing a steel into a shape of a part, the steel having an alloy composition containing, by weight percent, C: 0.10 to 0.30%, Si: 0.50 to 3.00%, Mn: 0.30 to 3.00%, P: 0.030% or less, S: 0.030% or less, Cu: 0.01 to 1.00%, Ni: 0.01 to 3.00%, Cr: 0.20 to 1.00%, Al: 0.20% or less, N: 0.05% or less, and the remainder of Fe and inevitable impurities, and the alloy composition satisfying the following condition: in which [Si %], [Ni %], [Cu %] and [Cr %] represent the concentration of Si, the concentration of Ni, the concentration of Cu and the concentration of Cr in the alloy composition, respectively; subjecting the steel to a carburizing treatment in a vacuum, followed by gradually cooling the steel; and subsequently subjecting the steel to a high-frequency hardening to thereby harden a surface of the steel.

The present invention provides a high-strength cold-rolled steel sheet having excellent deep-drawability and bake hardenability, a tensile strength of 440 MPa or greater, an average r value of 1.20 or greater, and a bake hardening value of 40 MPa or greater by a process in which a steel raw material containing, in terms of mass%, 0.010 to 0.06% C, between 0.5% and 1.5% Si, 1.0 to 3.0% Mn, 0.010 to 0.090% Nb, and 0.015 to 0.15% Ti, and having a component composition satisfying conditions of (Nb / 93) / (C / 12) < 0.20 and a solid-solution C content of 0.005 to 0.025%, is hot rolled and cold rolled, then annealed by heating from a temperature of 700 to 800 DEG C to a temperature of 800 to 900 DEG C at an average temperature increase rate of less than 3 DEG C / s, soaking, and then cooling at 5 DEG C / s or faster from the soaking temperature to a cooling stop temperature of 500 DEG C or below to obtain a formation which includes a ferrite phase having an area ratio of 70% or greater and a martensite phase having an area ratio of 3% or greater.

Microactuator, head gimbal assembly using the microactuator,method for manufacturing the head gimbal assembly, and hard disk drive are provided in the invention. The microactuator is provided with a base part bonded to a flexure, a pair of arm parts bonded to the base part, and PZT elements attached to each arm of the arm parts to be elongated / contracted based on an applied driving signal, and adapted to hold the side face of a magnetic head slider. The lengths of the arms are equal to or shorter than the longitudinal length of at least the magnetic head slider. The microactuator according to the invention is capable of achieving a structural strength while maintaining highly accurate positioning control with respect to a high recording density magnetic disk, and reducing manufacturing costs by using a conventional manufacturing process.

The invention discloses a preparing method of an Al-Mg alloy automobile engine mounting bracket. The preparing method sequentially comprises the following steps of preparing a Mg-Al alloy finished product and extruding the Mg-Al alloy finished product into a bracket finished product. By increasing the Mg content and adding a proper quantity of rare earth elements, the weight of the finished product is reduced, the cooling capability is improved, and excessive materials can be repeatedly utilized without obviously reducing the properties. Through the combination of common melting, homogenizingand the like, the mechanical properties of the materials are ensured. The finished product is formed in the extruding mode, and after quenching, temperature is raised to the one before quenching, so that quenching and annealing association is higher, the strength of the material is further improved, and internal stress is smaller. The service life of the finished product is prolonged.

Disclosed are: a fibrous filter which can improve the strength of a photocatalyst layer; and an air purification device utilizing the fibrous filter. Titanium dioxide particles (2) are thermally sprayed onto a fibrous filter main body (1) that comprises aluminum fibers each having a diameter of 50 to 500 µm and has an areal fiber weight of 500 to 10000 g / m2 and a void ratio of 50 to 90%. In this manner, a titanium dioxide coating film containing an anatase-type crystal structure at a ratio of 70 mass% or more can be formed.

The invention provides an assembled offshore single-pile foundation construction platform. The construction platform can serve as a large single-pile foundation drilling platform or a large single-pile driving stable pile platform, and comprises a stable pile frame, a steel protection cylinder and steel pipe piles; a positioning cylinder is arranged in the center position of the stable pile frame; multiple locking oil cylinders are symmetrically embedded in the upper end and / or the lower end of the positioning cylinder in the peripheral direction; the steel protection cylinder is inserted in the positioning cylinder, and is radially positioned by the locking oil cylinders; multiple mounting sleeves are uniformly and annularly arranged at the external of the positioning cylinder; the mounting sleeves and the positioning cylinder are fixedly connected through radial trusses; the adjacent mounting sleeves are fixedly connected through peripheral trusses; and the steel pipe piles are inserted in the mounting sleeves, and are connected with the mounting sleeves through clamping keys. The construction platform is quickly assembled through a detachable mode without needing offshore welding work, and can be recycled; and more importantly, through unique structural design, the construction platform is high in stability of bearing the wave load.

The invention relates to a heat treatment process for a crown casting of a large-sized hydraulic turbine. The heat treatment process for the crown casting of the large-sized hydraulic turbine comprises the following steps of heating: heating the crown from a room temperature to 250+ / -20 DEG C at a speed of 20 DEG C / h, heating the crown to 550+ / -20 DEG C, and preserving the heat of the crown at 550+ / -20 DEG C for W / 100 hours; heating the crown to 780+ / -20 DEG C at a speed of 30 DEG C / h and preserving the heat of the crown for 1.4xW / 100 hours; heating the crown to 1020+ / -10 DEG C at a speed of 50 DEG C / h and preserving the heat of the crown for 1.4xW / 100 hours; and blowing air to cool the crown to a temperature of less than 150 DEG C; and temper heat treatment: preserving the crown at 200+ / -20 DEG C for W / 100 hours; heating the crown to 400+ / -20 DEG C at a speed of 20 DEG C / h and preserving the crown for W / 100 hours; heating the crown to 600+ / -10 DEG C at a speed of 20 DEG C / h and preserving the crown for 3xW / 100 hours; and performing furnace cooling on the crown so as to cool the crown to a temperature of less than 150 DEG C at a speed of 30 DEG C / h. Through the adoption of the method, the stress of the crown in the heat treatment process is small, no crack is generated and overall performance requirements such as high strength and the like are satisfied.