35results about How to "Improve grain refinement" patented technology

The invention belongs to the field of chemical engineering materials and particularly discloses a treatment technique of aluminum alloy profiles for photovoltaic assembly supports. The technique comprises the steps of preparation of alloy raw materials, fused mixing of the alloy raw materials, refining and deslagging of molten aluminum, pouring of the molten aluminum, acid pickling of castings, plating assisting of the castings, and passivating treatment of the surfaces of the castings. According to the treatment technique, aiming at existing aluminum alloy materials, by adding metal elementssuch as Mn, Cu, Si, Mg and Ta and through reasonable formula design, the alloy strength is effectively improved, the grain refinement extent is greatly increased, and the effects on improvement of comprehensive properties such as the tensile strength, the elongation and the anti-corrosion property of aluminum alloys and the firm forming quality of oxidation films are remarkable.

The invention discloses a system and a method for continuous extrusion production of a fine-grain magnesium alloy strip. The system comprises a decoiling emptying device, an on-line straightening device, an on-line heating device, a continuous extrusion device, a cooling device and a winding displacement collection device. Through control of a temperature of a rod, a good extrusion driving force is produced between the rod and an extrusion wheel groove. Through an expansion mold cavity and a flow-blocking mold, magnesium alloy expansion flowing in a width direction is realized. In order to extrude a plate having larger width, the system adopts a two / three rod feeding-type extrusion mode so that joining and intermetallic welding of multiple rods in a corresponding multi-rod mold cavity are realized. The system and the method have the advantages that a process route is short; production efficiency is high; a grain refinement degree of a product microstructure is high; plate formability is good; and a continuous production line provided by the invention is suitable for industrial application.

The invention relates to a preparation method for a foam metal thickness difference sheet metal part. The preparation method for the foam metal thickness difference sheet metal part is characterized in that 1, firstly, at least two metal plates are stacked, and a foaming agent is sprayed on the contact face of the two metal plates; 2, then the two metal plates are rolled for the first time through rolling equipment to obtain once rolled metal plates each with an area to be foamed; 3, each once rolled metal plate is partitioned into two blocks from the area to be foamed; 4, the two once rolled metal plates are stacked to be rolled for the second time to obtain a foam metal plate with an area to be foamed; 5, the foam metal plate is placed in a heating furnace to be preheated to obtain a foam metal plate with a foaming area; 6, the preheated foam metal plate is placed in a stamping die to be heated until the foaming area reaches a foaming temperature; 7, the foam metal plate reaching the foaming temperature is subjected to hot stamping forming through the stamping die, meanwhile, pressure maintaining is performed to complete the secondary foaming of the foaming area, and then the foam metal thickness difference sheet metal part is obtained. The prepared foam metal thickness difference sheet metal part prepared by the preparation method for the foam metal thickness difference sheet metal part can meet performance requirements of parts of different portions, and the impacting energy absorption effect of the sheet metal part is improved by more than 40%.

The invention discloses a preparation method of a large-scale fine-grained tungsten rod and a large-scale fine-grained tungsten rod prepared by using the same. The preparation method of the large-scale fine-grained tungsten rod includes the steps of: powder preparation step: selecting tungsten powder, and Sieve to obtain tungsten powder; press forming step: press and form the tungsten powder to obtain a tungsten compact; sintering step: sinter the tungsten compact to obtain a tungsten sintered compact; two-roll rolling step: The tungsten sintered billet is continuously rolled by two rolls to obtain a tungsten rod; the swaging and shaping step: the tungsten rod is cleaned and polished, and then swaged into a circle to obtain a pure tungsten rod; annealing step: the pure tungsten rod is obtained Tungsten rods are annealed to obtain fine-grained tungsten rods. The preparation method of the large-scale fine-grained tungsten rod of the present invention has the advantages of high production efficiency, large amount of deformation, high degree of grain refinement, few human factors, stable product quality and small fluctuations, and the like.

The invention relates to a molten soup forging method and a molten soup forging die. The molten soup forging method and the molten soup forging die comprise an upper die, a lower die and side dies, to-be-produced wheel-shaped die cavity is formed among the upper die, the lower die and the side dies, wherein the molten soup forging method and the molten soup forging die are characterized in that a lower die assembly formed by coaxially enclosing the plurality of side dies and the lower die is coaxially embedded in a pressure bearing die sleeve, and a hydraulic pressure lifting mechanism which is vertically upward and used for lifting products is coaxially arranged at the lower end of the lower die. The molten soup forging method and the molten soup forging die have the advantages of improving product quality, reducing molten soup dosage, improving inner structure refined grain of metals, improving product mechanical property, tensile property and other overall properties, shortening product production time, reducing equipment maintenance cost, increasing output, improving production efficiency and prolonging die service life.