38results about How to "Improve internal and external quality" patented technology

The invention belongs to the field of pressure processing of steel materials, particularly relates to a forging-and-rolling compounded forming method for comprehensively promoting internal and external quality of wide and thick plate blanks. Numerical simulation technique is adopted to study internal strain distribution of the plate blanks formed by pure rolling, pure forging and the forging-and-rolling compounded forming method, and the forging-and-rolling forming method is provided and includes steps of 1), firstly heating the plate blanks to be cast; 2), subjecting the plate blanks to forging and deforming in a large hydraulic press after heating the same; 3), returning the plate blanks to be forged in a heating furnace for heat preservation after forging and deforming; and 4), delivering the forged plate blanks in a heated manner to a rolling mill to be rolled after heat preservation or cooling the same slowly to room temperature prior to being heated and rolled again. The forging-and-rolling compounded forming method has the advantages that the forging-and-rolling compounded forming method is applicable to forming process of various molded wide and thick plate blanks (slab ingot), especially to blanks with central looseness; by the method, the defect of core density loose of the wide and thick plate blanks can be overcome, micro-segregation can be alleviated, and texture of the plate blanks can be refined and distributed well; and meanwhile, surface quality of the steel plates can be guaranteed, working allowance can be reduced, and the finished wide and thick plate blanks with 'internal solidness and external refinement' can be realized.

A method for promoting the colouring on fruit (apple, pear, peach, grape, etc) features that the 5-aminolevulinic acid (ALA), or levulinic acid (LA)1 or glutamic acid (Glu) is applied to the fruit.

The invention provides a method for controlling internal defects of steel so that the steel can satisfy the requirement of ultrasonic flaw detection of the diameter of 2mm. The method controls temperature gradients inside and outside a casting blank by adjusting high-pressure water jet descaling parameters and then controls pass reduction so that deformation conditions in a rolled piece are changed, the core defects of the rolled piece are fully welded, and the internal defects of the casting blank are controlled within the diameter of 2mm to satisfy the requirement of the ultrasonic flaw detection of the diameter standard of 2mm. The method can improve the qualified rate of the ultrasonic flaw detection for steel, can reduce rolling passes, decreases the production cost and improves the production efficiency.

The invention discloses a method for remelting electroslag ingots for cold rolling rolls, belonging to the technical field of iron and steel metallurgy. The technical problem to be solved by the present invention is how to prepare high-quality electroslag ingots for cold rolling rolls through electroslag remelting. The invention provides a method for remelting electroslag ingots for cold rolling rolls, which includes the steps of baking electrode rods, selecting and baking slag systems, melting protective slag, electroslag remelting process, annealing process and the like. The present invention improves the chemical composition of the electrode rod, selects a suitable slag system, bakes the electrode rod and slag material, adjusts the electroslag remelting and annealing process, and prepares an electroslag ingot with good internal and external quality for cold rolling rolls. There are no defects such as ripples or slag grooves, and the high and low magnification inspections meet the quality requirements of the first-level billet, providing favorable conditions for the subsequent process to ensure product quality.

The invention discloses a production process of a large-piece-weight extra-thick chromium molybdenum steel plate. The production process comprises the steps of forging, preheating, heating and rolling, wherein the preheating procedure comprises the steps of heating a forged blank to 180-200 DEG C at a heating rate of less than or equal to 30 DEG C / h after the forged blank is placed in a furnace, simmering the steel for 4-5 hours with soft fire, then heating the steel in the furnace with the temperature raised to 400-450 DEG C at a heating rate of less than or equal to 50 DEG C / h, keeping thetemperature for more than or equal to 10 hours, and discharging the steel plate from the furnace. After the process is adopted, the blank and the finished steel plate do not have defects such as rupture and cracking, forging defects such as surface cracks, slag inclusion and internal tearing are effectively eliminated, and the forged blank and the steel plate have smooth surfaces, good quality andwide application value.

The invention relates to a casting method, in particular to a casting method for a main shaft of a wind generating set. The casting method provided by the invention comprises the following steps of: designing a pouring system, manufacturing a mould, shaping, manufacturing a core, assembling the mould, compounding, smelting, adopting a stokehold spheroidization process and multistage inoculation, pouring and shakeout clearing. The casting method for the main shaft of the wind generating set is unique, meets quality index requirements on size, performance, and internal and external quality, and can realize volume production for moving / fixed shafts.