31results about How to "Slow down the temperature drop" patented technology

The hot forging process of high temperature large alloy turbine disc includes the following steps: 1) conventional upsetting and drawing to form cylindrical alloy blank of 730 mm diameter with electroslag ingot of 900 mm diameter; 2) low temperature heating the blank at 900 deg.c, coating the sides with diathermic cotton, further heating to stipulated temperature and maintaining for prolonged 5 hr; 3) upsetting the blank to intermediate blank of 1700 mm diameter through the first traditional process to machining limit of the press and then local deforming with rectangular upper anvil of width below 400 mm; 4) coating the lower surface of the circular cake blank and heating in furnace for 2 hr; and 5) final rotary forging for local deformation with upper anvil of width of 200 mm and rotating angle of 15 deg to forge the intermediate blank of 1700 mm diameter into finished product of 2000 mm diameter in the reducing amount of 25 mm and deformation amount of 35 %.

The heat insulating, forging and blank cogging method of large GH742 alloy steel ingot features the high temperature adhesive of marketable glass powder with softening temperature over 800 deg.c and the heat insulating material of marketable asbestos blanket with aluminum silicate fiber; the steel ingot heat insulating process including spreading glass powder onto the asbestos blanket and coating the steel ingot after heating at 900 deg.c; the heat insulating period of 5-6 hr; the blank cogging of heating at high temperature with forging time not less than 5 min, reducing amount of 30 mm and deformation amount not less than 50 %; and the performance test of the formed alloy blank. The present invention solves the difficult problem of hot blank cogging and forming large GH742 alloy steel ingot.

The invention relates to a sowing technique, in particular to a stub no-tillage mechanical sowing cultivation method. The wheat stub no-tillage rape cultivation method comprises the steps of mechanically harvesting wheat, mixing selected rape seeds, chemical fertilizers and sheep dung, sowing rape seeds, performing rape field management, harvesting and the like. The method has the advantages of increasing soil moisture, reducing wind erosion and water and soil loss, regulating ground temperature, increasing nutrients in soil, improving activity of soil enzymes, preventing lodging, increasing forage grass and the like.

The invention relates to an automobile heating system. The automobile heating system comprises a heat exchange tube used for transferring heat by utilizing change of three states of matter as well as a heat exchange chamber and a three-way pipe, wherein the heat exchange tube is arranged in the heat exchanger chamber, the heat exchange chamber is provided with a blast blower, an air inlet and an air outlet, the three-way pipe comprises an air inlet pipe, a first air outlet pipe and a second air outlet pipe, the air inlet pipe is connected with an automobile exhaust pipe, the second air outletpipe is provided with a second valve, the air inlet end of the first air outlet pipe is provided with a first valve, the air outlet end of the first air outlet pipe is provided with a suction blower,the evaporation end of the heat exchange tube penetrates the heat exchange chamber and then is connected with the first air outlet pipe, the evaporation end of the heat exchange tube is arranged between the suction blower and the first valve. The invention provides the automobile heating system with good heating effect and protective action to an engine and solves the problems that the traditional automobile heating system has poor heating effect and large volume and is inconvenient to mount.

The invention discloses an ultrahigh-strength reinforcing bar and a production method thereof. The ultrahigh-strength reinforcing bar is prepared from the chemical compositions in percentage content by mass: 0.21-0.31% of C, 0.50-0.80% of Si, 1.40-1.60% of Mn, 0.06-0.27% of V, 0.01-0.20% of Nb, 0.010-0.017% of N, 0.02-0.10% of Als and the balance of Fe and unavoidable impurities. The production method comprises the procedures of steel slab heating, steel slab rolling and heat preservation after rolling. According to the ultrahigh-strength reinforcing bar and the production method thereof, thecomponent design of the ultrahigh-strength reinforcing bar adopts low content of precious alloy elements, the reinforcing bar after rolling is additionally covered with a heat preservation cover during cooling, the temperature dropping speed is decelerated, sufficient precipitation of V(C/N) is facilitated, and the obtained ultrahigh-strength reinforcing bar has the advantages that the mechanicalproperties are good, the content of the precious alloy elements is low.

The invention relates to a method for smelting a vanadium-based alloy. The method comprises the steps that a vanadium source, a reduction agent and a slag former are mixed and are placed in a reaction tank, and ignition for the reduction reaction is carried out; after the reaction is finished, the bottom of the reaction tank is subject to primary ultrasonic refining treatment, and the reaction tank is fixed and subject to sedimentation treatment; after sedimentation is finished, secondary ultrasonic refining treatment is carried out, and sedimentation treatment is continuously carried out; third-time ultrasonic refining treatment is carried out, and sedimentation treatment is continuously carried out; ultrasonic refining treatment and reaction tank static sedimentation treatment are alternatively carried out until molten alloy is solidified, and the vanadium-based alloy is obtained. The alloy raw material performance is improved while the production period is not prolonged, the alloy A-grade product rate is increased, the use amount of the reduction agent is reduced, and the comprehensive economic benefit is improved. The method can be applied to other metal heat reduction processes, a high-purity uniform middle alloy raw material can be produced, and can be widely applied to the high-technology industry of aerospace, nuclear energy and the like, and the good application prospect is achieved.

The invention discloses an adjustable windproof net for an orchard and belongs to the technical field of windproof nets. The windproof net comprises two first fixed upright posts, a cross beam, a plurality of second fixed upright posts and movable upright posts, wherein the top ends of the first upright posts are connected by the cross beam; the upper ends of the second fixed upright posts are connected with the cross beam; the lower ends of the second fixed upright posts are arranged on the ground; a protecting net is arranged between each movable upright post and the corresponding second fixed upright post; a fixing rope is arranged at the upper ends of the second fixed upright posts; the protecting nets and the upper ends of the movable upright posts are suspended on the fixing rope; a plurality of through holes are formed in the second fixed upright posts and the movable upright posts; pulling ropes are arranged in a mode of penetrating through the through holes; a plurality of fixed pulleys are arranged on the first fixed upright posts; the heights of the fixed pulleys arranged on the two first fixed upright posts are identical; a traction device is arranged on the outer side of one first fixed upright post; and the pulling rope bypasses the two fixed pulleys and the traction device. The adjustable windproof net disclosed by the invention can be folded and unfolded at any time and has the advantages of obvious windproof effect, high stability and easiness in construction.

The invention relates to the technical field of steelmaking processes, and in particular relates to a high-efficiency Q235B micro-titanized steel grade. The steel grade is composed of, by weight, 0.04% to 0.07% of C, smaller than or equal to 0.10% of Si, 0.35% to 0.55% of Mn, smaller than or equal to 0.040% of P, smaller than or equal to 0.035% of S, 0.010% to 0.050% of Als, 0.030% to 0.050% of Ti and the balance Fe. The invention provides a production process of the high-efficiency Q235B micro-titanized steel grade. Desulfurization and calcium treatment process are carried out by adding titanium to reduce carbon and "slag washing" after converter furnace, low-superheat-degree casting is adopted in the continuous casting process, the influence of sulfide in steel and a finished product banded structure on the product and performance is reduced, and the cold bending process requirements of customers are met.

The invention relates to a novel direct continuous casting slag washing mixed material and a preparation process thereof, and belongs to the field of special-performance alloy and powder metallurgy novel material in metal materials of the novel materials. The novel heating slag washing mixed material comprises the following components in parts by weight: 30-65 parts of aluminum oxide powder, 30-50 parts of quick lime, 1-6 parts of magnesium oxide powder, 0-6 parts of fluorite and 5-6 parts of silicon dioxide powder. The preparation process of the novel heating slag washing mixed material comprises the following steps of: ball-milling the materials in a ball mill to obtain particle powder; press-moulding the ball-milled particle powder by a ball press, smelting in an electric-arc furnace; and adding 5-40 parts of aluminum powder to the molten liquid during a turning down process, and crushing the cooled material into particles. The novel direct continuous casting slag washing mixed material disclosed by the invention can be used for filtering deoxidized desulfurized molten steel very well, so that produced deoxidation products can be caught effectively and modification of impurities in the steel is promoted, so that the purpose of evolving the molten steel is reached.

The invention relates to a thin gauge pipeline steel rolling method. In the steel, the content of C is within 0.05 percent; the content of Ni is 0.05 to 0.06 percent; the content of Ti is 0.01 to 0.02 percent; the content of B is 0.015 to 0.002 percent; the soaking temperature during rolling is 1,180 to 1,220 DEG C; the soaking time is 45 to 100 minutes; the torque of a roughing mill is 3,500 to 3,600 kN.m; the compression ratio is controlled to be 5 to 20; the width spread ratio is controlled to be 1.25 to 2.0; rough rolling is performed within 50 seconds after steel is discharged from a furnace; in rough rolling, the pressing down ratio of at least one pass is ensured not to be less than 21 percent when transverse rolling is performed, and the single pass pressing down ratio of at least two passes is ensured not to be less than 25 percent when longitudinal rolling is performed; and the temperature reducing speed is within 60 DEG C. According to the method, a controlled cooling link after the steel is rolled is cancelled by regulating chemical components of pipeline steel and heating; the type of a steel plate is improved; the production efficiency is greatly improved; and the production cost is reduced.

The invention belongs to the technical field of battery thermal management, and aims to provide a lithium ion battery thermal management system and method based on a phase change material and mutually embedded fins. The thermal management system comprises a battery box, and a lithium ion battery pack and a temperature detection unit are arranged in the battery box; the lithium ion battery pack at least comprises two battery monomers, the peripheries of the battery monomers are coated with a battery inner shell and a battery outer shell, and a phase change material is filled between the battery inner shell and the battery outer shell; a plurality of fins are arranged on the battery outer shell on the opposite sides of the two adjacent battery monomers, the plurality of fins are arranged at intervals, the fins on the opposite sides of the two adjacent battery monomers are arranged in a crossed manner, and a heat-conducting fin is connected between each fin and the battery inner shell; and the driving device is used for driving two adjacent single batteries to move in opposite directions so as to enable the fins on the surfaces of the single batteries to be mutually embedded to realize low-temperature thermal protection, or driving the two adjacent single batteries to move in opposite directions so as to enable the fins on the surfaces of the single batteries to be mutually disembedded to realize high-temperature heat dissipation.