137 results about "Hot strip mill" patented technology

A hot rolling mill and method for operating the hot rolling mill where the shape of the strip is controlled by localized cooling devices positioned at intervals along work rolls in at least three lateral zones, a central and two edge zones, and capable of separately cooling each zone to control the shape of the work rolls in that zone and inhibit the formation of shape defects occurring in the strip being rolled. Five zones may be provided across the work surface of the work rolls so that two intermediate zones can control for quarter buckles. The hot rolling mill has particular application in continuously casting thin strip. The method can be made automatic by sensing downstream of the hot mill the shape of the strip in each zone.

The invention provides a full-automatic high-speed winder, which realizes the full automation and high speed in the production process of non-woven fabrics. The full-automatic high-speed winder adopts the program control for cooling, cloth cutting and shaft exchanging and realizes automatic regulation for the main indicators of tension, rotating speed and diameter of a cloth roll, thereby adapting to the requirements of high speed and automation of a hot rolling machine, so that the hot rolling machine can keep good running state all the time, and the excellent quality of the produced non-woven fabrics is ensured. The winder is the equipment integrated with the machine, the electric apparatus and the instrument and has the advantages of compact structure, full functions, high speed, high efficiency and accurate measurement. The winder achieves the following indicators: the effective working width is 2,000mm, the mechanical speed is regulated at 20-350m / min, and the maximum winding diameter Phi is 2,200mm, therefore, the winder has high working efficiency and economic efficiency.

The invention relates to a method for controlling micro-tension of a hot strip rolling looper, which aims at improving the quality of hot rolled products and the finished product rate of hot rolling.The method is applicable to automatically controlling a finishing rolling hydraulic looper on a hot strip mill, when a strip steel is completely snapped by adjacent two finishing mill stands of the looper, a control system calculates the looper tension torque proportionality coefficient according to the following formula: Kp is equal to (absolute value of (delta Mact multiplied by (1 minus et / T) divided by Mref) multiplied by K1 plus K2 plus 1) multiplied by C, wherein delta Mact is the actual torque variable quantity; Mref is the set torque; K1 is the deviation amplification proportionality coefficient; K2 is the anti-resonance proportionality coefficient; C is a control constant; t is filtering time with the unit being s; T is sampling time with the unit being s; and the control system cuts off the calculation of the micro-tension coefficient of the looper through the tracking calculation of the tail part of the strip steel when the tail part of a front stand of the adjacent stand turns to the small looper at 5 seconds before throwing steel, turns to the constant micro-tension torque calculation and finally determines the final looper position for controlling and setting.

In hot strip plants the residual heat of a part of the slabs after casting was hitherto utilized by either directly rolling the slabs or inserting the slabs into the furnace in a still warm or hot state. After casting, the remaining slabs usually cool down in an aerated hall and are stacked before being further conveyed. The same applies to the residual heat which is present after coiling in the coils which are often air-cooled in a coil storage. The cooling energy of the continuous casting plant also escapes into the environment without being utilized.; According to the invention said unutilized solidification and residual heat is converted into electrical energy by casting the slabs (10) in a continuous casting plant, conveying the slabs (10) or coils to the slab storage (12) or coil storage, removing heat therefrom in heat exchangers (31) during casting and / or during conveying, and / or placing the slabs for a short time or for several hours partially stacked on specifically prepared storage areas (30) which are designed with heat exchangers (31), wherein during the conveying period the heat of the cast strand or the slab (10) and / or during the storage period the residual heat of the slabs (10) or coils is transferred by means of heat conduction and heat radiation and convection via the heat exchangers (31) to a heat carrying medium, such as thermal oil,; thereby heating the heat carrying medium which is then removed via heat carrier transport ducts (33) for power generation and / or for direct utilization of the process heat in other heat consumers.

The invention discloses a titanium steel composite board production method. The method comprises the steps that a steel plate is rolled on a hot mill to be 6 mm thick, and air cooling is carried out on the steel plate, the surface of the steel plate obtained after air cooling is carried out and the surface of the titanium plate are cleaned thoroughly, and then the steel plate is rolled by 2-5 passes under the temperature condition being 850 DEG C; the steel plate comprises chemical components being 0.16% of C, 0.61% of Mn, 0.2% of Si, 0.23% of S, 0.019% of P, 0.3% of Cr, 0.3% of Ni, 0.3% of Cu, 0.08% of As, and the balance Fe; according to the chemical components, the titanium plate comprises 0.08% of Fe, 0.08% of O, 0.05% of C, 0.0112% of N, 0.01% of Si, 0.01% of H and the balance Ti. The chemical components of the titanium plate and the steel plate are strictly controlled, the phenomenon that the composite board is mixed with impurities is effectively avoided, and the method is simple and low in production cost.

The present invention provides a board width controller of a hot rolling mill and a control method thereof. The fine finishing width reduction amount can be estimated with a high precision in a preset stage for controlling the board width without the dependence to the fine rolling. The board width controller of the hot rolling mill controls the board width of hot-rolled strip coil to a target board width given by the manufacturing instruction. The controller comprises the following components: a width roller which rolls the heated steel bar in the width direction; a roughing mill which is adjacent with the width rolling mill and rolls the steel bar obtained after the rolling the width rolling mill in the board thickness direction; and a finishing mill which further rolls the steel bar obtained after the rolling of the width rolling mill and the roughing mill in the board thickness direction for producing the hot-rolled strip coil. The board width controller further comprises the following components: a fine finishing width reduction estimation amount calculating part which estimates the board width reduction amount of the finishing mill; and a first board width target modifying part, wherein, the control instruction calculated based on the target board width modified by the modifying part is output to the width rolling mill.

The invention discloses a cast iron material pinch roll used for a hot strip mill. The pinch roll comprises alloy components including, by weight percent, 2.90%-3.60% of C, 1.30%-2.00% of Si, 0.40%-1.00% of Mn, 0. 50%-1.00% of Cr, 1.50%-2.50% of Ni, 0.30%-1.00% of Mo, smaller than or equal to 0.10% of P, smaller than or equal to 0.05% of S and the balance Fe and inevitable impurities. The invention further discloses a manufacturing method of the cast iron material pinch roll used for the hot strip mill. The manufacturing method includes the steps of smelting, inoculation and spheroidizing treatment, casting and heat treatment. The pinch roll can have the high wear resistance, the good heat crack resisting performance, the accident impact resisting capability and other comprehensive performance, and complex rolling conditions of the pinch roll before a reeling machine of the hot strip mill can be met.

The invention discloses a sequential control method of sheet strip of hot-rolling mill, which comprises the steps: 1. precomputing: after the tail of former sheet strip is broken away from the first frame, the breaking-away signal is taken as control signal to start-up a second rolling model computer to rolling precompute to the next block slab, and send data to the next level control computer; 2. loading executing: the first level control computer receives rolling precomputing data of the next block slab, and store the data in buffer; the first level control computer acquires in sequence breaking-away signal of the former sheet strip of each rolling mill frame and sends the next slab precomputing data in buffer of corresponding frame to corresponding frame for execution in turn. The invention has the advantages of greatly shortening interval time of rolling between slabs, being capable of realizing fast tapping of sheet strip hot-rolling mill, remarkably improving working efficiency of sheet strip hot-rolling mill, enhancing about 20 percent of productivity with good economic benefit.

The present invention is directed to an iron powder commodity and to a process for producing such iron powder commodity comprising dehydrating and de-oiling hot strip mill (HSM) sludge within an inert gas atmosphere contained in a reaction chamber; venting and processing reaction chamber off-gas into a hydrocarbon product; discharging from the reaction chamber a dry de-oiled iron powder commodity that contains nanoparticle and ultrafine particle iron-bearing solids, and beneficiating the discharged iron powder commodity into particles of similar properties.

A thin cast strip is formed having at least one microstructure selected from the group consisting of polygonal ferrite, acicular ferrite, Widmanstatten, bainite and martinsite, a surface roughness of less than 1.5 microns Ra and a scale thickness of less than about 10 microns by applying a mixture of water and oil on the work rolls of the hot rolling mill, passing the thin cast strip at a temperature of less than 1100 DEG C through the hot rolling mill while the mixture of oil and water is applied to the work rolls, and shrouding the thin cast strip from the casting rolls through the hot rolling mill in an atmosphere of less than 5 % oxygen to form the thin cast strip.

A thin steel strip is passed through a pinch roll stand comprising pinch rolls to a hot rolling mill comprising work rolls and backing rolls. In advance of rolling mill, the strip passes over support rolls. An anti-crimping guide roll located immediately in advance of the rolling mill is mounted on a pair of rocker structures so as to be rasiable from a lower inoperative position to lift the strip out of a straight line path so as to pass around the anti-crimping roll and to be wrapped about the upper work roll, that roll supports the strip and resists buckling of the strip and the generation of crimping defects.