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

The invention provides a production method of a large-caliber high-pressure boiler tube, comprising the following steps: inspecting blank; saw cutting blanking; heating by an annular furnace; punching by a Mannesmann punching machine or punching by hydraulic pressure and punching by utilizing the Mannesmann punching machine; pre-punching a mandril; rolling by a pilger mill; carrying out hot-sawing on pilger heads; reheating by a walking beam furnace; externally descaling by high pressure water; sizing by a sizing mill; cooling by a cooling bed; carrying out thermal treatment; sampling; passing physical and chemical inspection; straightening; cutting head and end parts; carrying out manually initial check; polishing an inner surface and an outer surface or internally boring and externally raking; blowing soot; carrying out ultrasonic and eddy-current combination detection; manually rechecking; carrying out spectral inspection; measuring length and weighing; jet-printing; and finally packaging and warehousing. In the method, a steel billet is heated in the annular furnace, which comprises three processes of preheating, heating and soaking; and heating temperature and time in each process are rationally distributed to prevent heating unevenness and heating defects. During the tube rolling process, the feeding system of the pilger mill completes feeding release with the feeding quantity less than 0.5mm, thus achieving uniform and accurate feeding quantity in each rolling cycle.

The invention belongs to the technical field of automobile steel and particularly relates to non-quenched steel for camshafts and a preparation method of the non-quenched steel. The steel is preparedfrom the chemical components in percentage by mass: 0.42%-0.49% of C, 0.30%-0.60% of Si, 1.00%-1.50% of Mn, 0.06-0.13% of V, 0.035%-0.075% of S, less than or equal to 0.035% of P, less than or equal to 0.30% of Cr, less than or equal to 0.30% of Ni, less than or equal to 0.30% of Cu, 0.010%-0.040% of Alt, less than or equal to 15 ppm of [O], and the balance Fe and inevitable impurities, specifically, C+Si/6+Mn/4.5+1.8*V is equal to 1-1.1. Electric furnace smelting and LF refining are adopted, desulfuration, then sulfuration and proper calcium treatment process are adopted in the refining process, and Mn/S is controlled. The vacuum treatment time of the steel is longer than or equal to 12 minutes, and the soft blowing time is longer than or equal to 20 minutes. A casting blank is cast through continuous casting, the pulling speed and the superheat degree are controlled, and the continuous casting of twelve furnaces or more is achieved. The heating and soaking temperature, the heating time, the initial rolling temperature, the final rolling temperature, the cooling speed and the like are controlled in the rolling process, and finally, peeling and flaw detection are carried out, so that high-quality round steel is obtained; and the round steel can meet the requirement for direct cutting processing.

The invention relates to the field of calligraphy and painting paper manufacturing, and specifically relates to a water-resisting breaking-resisting oxidation-resisting calligraphy and painting paper. The paper is prepared from raw materials and auxiliary materials through a pulping process and a paper making process. The raw materials comprise components of, by weight: 45-80 parts of bamboo pulp fiber, 10-30 parts of grass pulp fiber, 2-25 parts of wool pulp fiber, and 5-25 parts of viscose fiber. Each ton of the paper comprises auxiliary materials of, by weight: 0.5-2% of an antiseptic, and 3-15% of PVA. The calligraphy and painting paper provided by the invention has excellent water resistance, breaking resistance and oxidation resistance. The water-resisting and breaking-resisting functions are 10 times higher than a wet tensile strength index of a GB/T18739-2008 national standard of rice paper.

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 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.

The invention relates to a method for manufacturing a large ingot through electromagnetically-controlled self-inoculation treatment. The method comprises the steps as follows: (1) a Y-shaped double-phase conveying nozzle is adopted for molten metal casting, and an electromagnetic device I is arranged on the outer side of the straight section of the double-phase conveying nozzle; an electromagnetic device II is arranged on the outer side of an ingot mold riser; (2) an ingot mold and the double-phase conveying nozzle are preheated before casting; (3) argon shielding is performed during casting, an inoculant is added when the liquid level of molten metal rises to 1/2-2/3 of the height of an inner cavity of the ingot mold, meanwhile, the electromagnetic device I is started, and the electromagnetic device II is started when the liquid level of molten metal rises to the height of the ingot mold riser line; and both the electromagnetic device I and the electromagnetic device II run at the low frequency; (4) after casting is completed, the electromagnetic device I is shut down, the electromagnetic device II s adjusted to run at the intermediate frequency from the low frequency, and heat insulation is performed on the ingot mold riser part by the aid of the Joule heating effect of the intermediate-frequency magnetic field until the ingot is solidified. With the method, the solidification structure of the steel ingot can be refined, the center segregation can be reduced, the center porosity can be reduced, and thus the inner and outer quality of the ingot can be improved.

The invention relates to a process for producing a low-chromium complex alloy grinding ball. The process comprises the steps of melting, pouring, casting a metal mold and tempering, chemical components of the low-chromium complex alloy grinding ball are reasonably designed, and metal mold casting and tempering are carried out, so that the internal and external quality of the grinding ball can be improved, the product does not have the casting defects, such as sinkholes, pores, looseness and the like, the broken rate and no circularity of the grinding ball can be reduced, the fatigue impact resistance and wear resistance of the grinding ball can be improved, the product yield can be remarkably improved, the production process can be simplified, and the production cost can be reduced.

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.

The invention relates to the field of plate blank continuous casting and particularly relates to a method for measurement of flow-field direction and intensity in a crystallizer and a flow-field intensity indicator. The method is characterized in that the flow-field intensity indicator is used to monitor the flow-field intensity and direction in the crystallizer in a casting process and quantitative analysis on possibility of cutting slag of steel slag interfaces in the crystallizer is performed and used as the basis of adjustment of related parameters of the crystallizer. The flow-field intensity indicator is characterized by including a hanger, horizontal footstands, a hook and a flow measurement board. The flow measurement board is an integral structure which is formed through combination of a pointer, a hanging ring, a connecting rod and a floater. Compared with the prior art, the beneficial effects of the flow-field intensity indicator are that an operator is capable of detecting different conditions: different steel types, different pulling rates, different immersed water port insert depths and argon blowing flow and the like so that change rules of the flow field in the crystallizer under different conditions are obtained and thus flowing method of steel water in the crystallizer can be adjusted, controlled and optimized so as to improve external and internal qualities of casting blanks.

The invention relates to an air fertilizer applying device. The air fertilizer applying device comprises an air source device (1) and a main pipe (4). One end of the main pipe (4) is connected with an air outlet of the air source device (1), multiple branch pipes (5) are divided from the other end of the main pipe (4), and a plurality of micropore pipes (8) are connected onto each of multiple branch pipes (5). A pressure gauge (2) is arranged at the position of the air outlet of the air source device (1), and a pressure reducing valve (3) is installed on the main pipe (4). An adjusting valve (6) and the pressure gauge (2) are arranged at the connecting position of each of multiple branch pipes (5) and the main pipe (4). The air fertilizer applying device can improve plant yield.

The present invention relates to banana protecting material and disease preventing cover. The banana protecting material of paper, polyethylene film and applied glue film layer is produced into disease preventing cover for enclosing banana to reduce frost damage, promote banana growth, raise the quality of banana and increase banana yield. It may be reused for several times.

The invention discloses an application of mPE (metallocene polyethylene) in improving pressure resistance of an HDPE (high density polyethylene) tube. During the production of the HDPE tube, the mPE is added as a raw material, and the mPE, the main raw material namely HDPE and a pigment are subjected to processes of stirring, mold blank extruding, cooling, shaping, hauling and cutting to manufacture the HDPE tube. The invention simultaneously discloses the HDPE tube and a preparation method thereof. The invention has the beneficial effects that in an HDPE system, after the mPE is added, the HDPE tube has excellent physical and mechanical properties and very good molding performance because of abundant branched chain structures of the mPE. Moreover, due to the excellent processability of the mPE, the flow property of the HDPE during the production of the tube can be improved and then the appearance quality of the tube is improved, so that the internal and external quality of the tube is integrally improved.

The invention discloses a remelting method of an electroslag ingot for a cold roller, and belongs to the technical field of ferrous metallurgy. The technical problem to be solved is how to prepare thehigh-quality electroslag ingot for the cold roller through electroslag remelting. The invention provides the remelting method of the electroslag ingot for the cold roller. The remelting method comprises the steps of electrode rod baking, slag system selection, baking, melting protection slag, electroslag remelting process, and annealing process and the like. According to the method, chemical components of the electrode rod are improved, the proper slag system is selected, the electrode rod and slag material are baked, the electroslag remelting and the annealing process are adjusted, so that the electricslag ingot for the cold roller with good internal and external quality is prepared, defects such as ripples or slag runners are avoided, quality requirement of first-stage blank is met through high and low time inspection, and favorable conditions are provided for subsequent working procedure to guarantee product quality.

The invention provides a method for improvement of the calyx leaving rate of fruits of Nanguo pears. A 200-fold PBO solution is sprayed on all flowers at the full-bloom stage, and a 200-fold calcium-boron mixed solution is sprayed on all young fruits at the fading stage; the 200-fold PBO solution is prepared by dissolving PBO in the proportion of 1 g PBO to 200 ml water; the 200-fold calcium-boron mixed solution is prepared by dissolving CaCl2 and boric acid in the proportion of 1 g CaCl2 to 1 g boric acid to 200 ml water. According to the method for improvement of the calyx leaving rate of the fruits of Nanguo pears, specific chemical agents are sprayed on flower organs at the full-bloom stage and the fading stage of the Nanguo pears respectively, so that not only is the calyx leaving rate of the fruits improved, but the stone cell content is reduced, and the internal and external qualities of the fruits are improved.

The invention provides a trimming method of a planar four-main-branch tree form and application in culturing thereof, and relates to the technical field of peach tree culturing. The method comprises the steps that one, heading is conducted at the part 30-50 cm above a grafting hole of a peach tree; 2), two branches with strong growing trend growing in the row in the direction from south to north are selected as trunks from May to June; 3), two bamboo poles are inserted on the two sides of a peach tree plant in July, and the two trunks are drawn towards the two bamboo poles on the outermost sides respectively; 4), secondary shoots close to a heading point on the trunks are selected as new trunks in August, and the new trunks are drawn to the bamboo poles on the inner sides respectively; thenew trunks grow vertically upwards. According to the method, nutrients can be dispersed to each trunk by the tree form, the number of spindling branches of a tree body is low, the labor force used onintegrally trimming is less, fruit yield on the upper middle part of the tree body is increased, big fruit proportion is increased, the quality is improved, and the space in row direction is increased.

The invention relates to a die mold comprising an upper mold unit, a lower mold unit and a slide block unit, wherein the upper mold unit is provided with an upper mold cavity unit, and the lower mold unit is provided with a lower mold cavity unit; the upper mold cavity unit cooperates with the lower mold cavity unit; the slide block unit is arranged in the space formed by the cooperation of the upper mold cavity unit and the lower mold cavity unit; the bottom of the slide block unit is provided with a material inlet; the die mold also comprises an oil hydraulic slide block drawing device used for drawing out the slide block unit; and three side surfaces of the slide block unit are respectively provided with a unilateral angle of 2 degrees. The scheme of the invention comprises the tunnel-type material feeding structure on the bottom of the slide block unit of the die mold and the oil hydraulic slide block drawing device; the material inlet is arranged in the positions beneficial to filling and forming of the casting by utilizing the slide block unit; and gas in the space fills a lot of space obtaining the cavity by the substitution of the raw material, thereby overcoming many defects in form filling and die casting.

The invention provides a thermal treatment technique of a thin format steel plate and is characterized in that a furnace cooling process is added between the heat preserving process and the air cooling process;parameter requirements of each process comprise: 1. a steel plate in a heat treatment furnace is heated to a temperature of Ac1-Ac3 in the heating process; 2. the holding temperature of the steel plate in the heat treatment furnace is Ac1-Ac3 and the heat-preserving time is 1H-3H in the heat preserving process; 3. the temperature of the steel plate at the furnace port is 350 DEG C - 650 DEG C in the furnace cooling process; 4. the steel plate took out from the furnace is cooled in the air to the room temperature.Comparing with a general technique of normalization and cold leveling, the technique of the invention has characteristics of low equipment investment, low energy-consumption, short line of production, low producing cost and better inside and outside quality of the steel plates.

The invention relates to the technical field of battery management systems, and discloses a cleaning method for a long-service-life high-reliability universal valve for a spacecraft. Cleaning is conducted through a cleaning box, the cleaning box comprises a water tank and an upper cover, the interior of the water tank is of a stepped structure and used for containing products of different lengths, and a water inlet hole is formed in the upper end of the side face of the water tank; the lower end of the other side face is provided with a water outlet hole which is in a flowing state in the cleaning process. The cleaning box is made of plastic, the proportion of the cleaning solution is suitable for cleaning different propelling product materials, and the cleaning problem of different materials is solved. The device is simple in structure and convenient in clamping process, saves solution consumption through an internal stepped structure, is suitable for cleaning products with different lengths, and improves production efficiency. After the cleaning process is adopted, the cleaned inner hole part does not contain redundant materials, and the internal and external quality is improved.