35results about How to "Reduce the number of roll changes" patented technology

The invention relates to the field of preparation of rolling mill equipment, in particular to a preparation method of a roll collar for a rolling mill and aims to improve the rolling quality and the rolling efficiency of a wire and rod rolling mill and reduce rolling costs. The preparation method comprises steps as follows: a roll collar base body and a roll collar sleeve are prepared, the roll collar base body is arranged between the inner side wall and the outer side wall of an annular cylinder of the roll collar sleeve, a powder accommodating channel is located above an accommodating cavity in the roll collar sleeve, compaction operation is performed after the alloy powder is injected, and a top cover is mounted at the top of the powder accommodating channel; the roll collar sleeve with the roll collar base body and the alloy powder inside is put into a degassing furnace to be vaccumized and subjected to degassing thermal insulation and then is put into a hot isostatic pressure furnace for hot isostatic pressure treatment; the roll collar is obtained after the roll collar sleeve is removed, and the roll collar is sequentially subjected to annealing treatment, quenching treatment and tempering treatment. The roll collar prepared with the method has better wear resistance and long service life, and the thickness of a work layer is uniform.

The invention discloses a method for eliminating spiral roll marks on a steel strip surface finishing machine. The method comprises the following steps of: initially washing the roll surface of the finishing machine by using spiral water current; and scraping the roll surface of the finishing machine by using fan-shaped water current, and further washing the roll surface. The invention further discloses a device for eliminating spiral roll marks on the steel strip surface finishing machine. Under the condition of slightly modifying high-pressure washing equipment of the finishing machine, thedefect of spiral roll marks on the steel strip surface finishing machine can be eliminated, the roll replacing times of the finishing machine on a continuous zinc-plating production line can be reduced, and the production cost is greatly lowered.

The invention discloses a high-speed steel working roll for a hot rolled sheet steckel mill in an iron works. Outer-layer chemical ingredients of the high-speed steel working roll include, by 100% of total mass, C 0.5-3.0%, Si 0.1-2.0%, Mn 0.1-3.0%, P <= 0.1%, S <= 0.03%, Ni 0.3-6.0%, Cr 0.3-8.0%, Mo 2.5-7.5%, V 3.0-8.5%, W 0.1-5.0%, Ti 0.2-2.0%, Mg <= 0.02%, graphite <= 0.2% and the balance Fe and inevitable impurities. The outer-layer chemical ingredients of the high-speed steel working roll are changed, accordingly the high-speed steel working roll for the hot rolled sheet steckel mill in the iron works can be higher that ICDP in hardness and can be almost the same as the ICDP in impact force resistance, products can be rolled to be thinner, and product slipping phenomena can be decreased. If a finish-rolling working roll of the steckel mill is replaced by the high-speed steel working roll for the hot rolled sheet steckel mill in the iron works, the abrasion amount of the roll is very low, the surface accuracy of the produced products is good, the online usage time of the roll is very long, the service life of the roll is prolonged, the roll changing times are decreased, and the productivity and production efficiency are greatly improved.

The utility model relates to an anti-nodulation device for a furnace roll surface of a strip steel annealing furnace, which belongs to strip steel heat treatment equipment, and in particular relates to a strip steel continuous annealing furnace. The characteristic is that the nitrogen delivery pipe is provided with an inlet pipeline, and the outlet end of the inlet pipeline is connected to a nitrogen humidification device by a nitrogen gas inlet valve, a pressure reducing valve, a moisture regulating valve, and a dry gas regulating valve, and the nitrogen humidification device is fed into the furnace by moisture. The regulating valve and the injection pipeline are connected to the wet gas nozzle at the bottom of the soaking section of the annealing furnace, and the air intake pipeline, the nitrogen humidification device, the injection pipeline and the annealing furnace form a gas passage. The advantage is that the dew point of the atmosphere in the soaking section of the annealing furnace of the device is -27°C to -35°C, and the gas particles with a high dew point are first enriched at the valley point of the roughness of the non-strip contact surface of the furnace roll, and the high temperature from the heating section The strip steel wraps it, and the gas particles expand when heated, which effectively prevents the sponge iron on the strip steel from sticking to the furnace rolls, improves product quality, reduces the number of times of furnace roll replacement, reduces spare parts costs and production costs, and improves product quality. Product yield and unit operating rate.

The invention discloses a preparation method of white cast iron for a roller, and the white cast iron. The preparation method of the white cast iron for the roller comprises the following steps that S1, smelting is conducted, specifically, pig iron, scrap steel, ferrochrome, ferromolybdenum, pure nickel, ferrovanadium and ferrotungsten are added into a furnace to be smelted, so that chemical components of molten iron meet the content requirement of the white cast iron, the temperature is increased, the white molten iron is obtained, and tapping is prepared; S2, outside-furnace treatment is conducted, specifically, yttrium-based heavy rare earth is added along with flow during tapping, inoculation modification treatment is conducted on the white cast iron, then slag removal is conducted, and the chemical components of the white cast iron subjected to outside-furnace treatment meet the content requirement of the white cast iron for the roller; S3, centrifugal casting is conducted; S4, destressing treatment is conducted; S5, processing forming is conducted; and S6, modification treatment is conducted, specifically, the white cast iron roller with the allowance reserved is tempered. The white cast iron prepared by the method for the roller has higher wear resistance, thermal cracking resistance and high red hardness, and the roller prepared from the white cast iron for the roller has the longer service life.