53results about How to "Large amount of depression" patented technology

The invention relates to a sheet rolling mill with a hydraulic screwdown on a support roll. The mill is characterized in that a frame is a horizontal rectangular columnar frame, both sides of an upperbeam of the frame is provided with a journal hydraulic screwdown of an upper support roll, a bearing pedestal and two rectangular columns of a working roll and the support roll form two horizontal frames of the mill, hydraulic screwdown of one or two support rolls which are fixed in the middle of the upper beam of the horizontal frame press a cylindrical surface of the support roll body by a hydrostatic semicircular block, a hydrostatic semicircular block with a bearing is supported in the position of a lower support roll which is the same as that of the upper support roll, the bearing is fixed on a lower beam of the frame. The mill has the following advantages: the position and pressure of the hydraulic screwdown of the journal and the roll body are regulated by a sensor to greatly reduce elastic deformation of the support roll during working, and can realzie rolling of the accurate-sized steel plate and increase percent reduction under the condiiton of reducing number and diameter of the supprt rolls and diameter, thus reducing cost and enhancing efficiency.

The invention provides a phosphorus-containing steel slab continuous casting method, wherein the phosphorus content of molten steel is equal to or greater than 0.02%. The phosphorus-containing steel slab continuous casting method comprises the following steps: carrying out low superheat degree control on molten steel, wherein the superheat degree range of molten steel in a tundish is 15-25 DEG C;adopting strong cooling for cooling a crystallizer, wherein the water flow velocity of the wide face of the crystallizer is 9.5-10.5 m/min, and the water flow velocity of the narrow face of the crystallizer is 13.0-14.0 m/min; carrying out deviation control on a plurality of continuous casting machine roll gaps in a sector section, and carrying out deviation control on the roll gap precision of zero section to fourth sections according to the range of +/-0.5 mm; carrying out negative deviation control on the roll gap precision of fifth section to the section before soft reduction according tothe range of -0.5 mm to 0 mm; carrying out positive deviation control on the roll gap precision of the section subjected to soft reduction according to the range of 0.3+/-0.3mm; and carrying out deviation control on the roll gap precision of the section after soft reduction according to the range of +/-0.5mm. With adoption of the phosphorus-containing steel slab continuous casting method, generation of segregation of p at a grain boundary is effectively reduced, generation of segregation of p at a casting blank center is also reduced and an excellent phosphorus-containing steel slab is obtained.

The invention relates to a preparation method of a bimetal composite wire, belonging to the field of bimetal composite wire preparation. In this method, two metal pipes and bars of different materials are surface-treated and nested together, and then the pipes and bars nested together are rolled by a three-roller planetary rolling mill, so that the pipes and bars are combined together. , to obtain a bimetallic composite billet; the bimetallic composite billet is rolled again with a multi-stand Y rolling mill or a vertical roller mill, and rolled into a bimetallic composite wire rod with a diameter of 4.5-5.5mm; The metal composite wire is drawn and processed to prepare a bimetal composite wire with a diameter of 0.5 mm to 3 mm. A series of bimetallic composite wires such as titanium-clad copper bimetallic composite wires, titanium-clad steel bimetallic composite wires, and copper-clad aluminum bimetallic composite wires can be prepared. The bimetallic composite wires obtained by this method have high bonding strength between the two metals. The production equipment is simple, flexible and low in cost.

The invention discloses a deep-cup-shaped thin-wall part current auxiliary composite spinning forming device and method. The device comprises a spinning core die, a tailstock and a plurality of spinning rollers distributed on the circumference of the spinning core die at equal intervals. The spinning rollers are arranged in a staggered manner in the axial direction and the radial direction of thespinning core die. The spinning surfaces of each spinning roller comprise a deep drawing spinning surface, a flowing spinning segment and a shaping spinning surface. The deep drawing spinning surfaces, the flowing spinning segments and the shaping spinning surfaces of all the spinning rollers are distributed in a staggered mode in the axial direction and the radial direction of the spinning core die. In the spinning process, arc-shaped surface shapes and structures of the spinning rollers for deep drawing and spinning are different, so that the spinning rollers focus on exerting pressure to different portions of a blank respectively in each rotation period of the spinning core die, the pass reduction is increased, the spinning pass is reduced, the production efficiency can be improved, andthe defects that the material processing process is discontinuous, finally workpieces are hardened and materials are broken and cannot be used are reduced.

The invention discloses thin-specification X65 steel-grade pipeline steel of a single-rack steckel mill and a rolling method. The steel is composed of the following components in percentage by weight:0.03 to 0.07 percent of C; 0.10 to 0.30 percent of Si, 1.30 to 1.70 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.0050 percent of S, 0.040 to 0.060 percent of Nb, less than or equal to 0.10 percent of V, 0.006 to 0.020 percent of Ti, 0.10 to 0.25 percent of Cr, less than or equal to 0.30 percent of Ni, less than or equal to 0.10 percent of Mo, less than or equalto 0.10 percent of Cu, 0.015 to 0.050 percent of Al and the balance of Fe and impurities. According to the rolling method, a blank with the thickness of 150 mm is used for producing the thin-specification pipeline steel plate with the finished product specification of (6-8) mm X65 grade. By controlling the tapping temperature, the coiling furnace temperature, the second-stage initial rolling temperature, the rough rolling final pass reduction rate, the final rolling speed, ACC cooling and the like, the thin-specification X65 steel-grade pipeline steel plate with the performance and the plateshape meeting the requirements is obtained, the productivity and the yield of a rolling mill are improved, and the performance percent of pass is high.

The invention discloses a production method of crack arresting steel for a container ship. Billets having different cross sections are selected for rolling according to different finished product widths, the rolling pass is reduced, and the reduction in pass is increased; as for planning arrangement, according to the characteristics that the rolling mode is special and the rolling frequency is slow, the time in a furnace is shortened through blank positions in a heating furnace, execution of a heating technology is ensured, and the surface quality is ensured; the heating process ensures the uniformity of a plate slab in the thickness direction; a rolling technology uses a full longitudinal rolling or full horizontal rolling manner as many as possible, and the effective compression ratio isincreased; and in order to refine grains, the intermediate billet is subjected to ultra-fast cooling, different cooling technologies are set according to specifications, and a finished steel sheet cooling technology is determined. A stable production technology for accurately and effectively producing the crack arresting steel can be realized, the stability of the production technology of the crack arresting steel meets the batch industrial production, the mechanical properties, the product quality stability and various indexes meet the standard requirement, and the production process is easyto control.

The invention provides a method for treating defects in the cleaning section in the pickling process of stainless steel cold rolling. The method for treating defects in the cleaning section in the pickling process of stainless steel cold rolling includes: in the final cleaning process, using at least three The rollers clean the steel strip, and the three groups of rollers are respectively an entrance-side squeezing roller, a middle-side squeezing roller and an exit-side squeezing roller, wherein the material of the exit-side squeezing roller is polyurethane rubber. The invention eliminates the defect that the rubber is pressed into the binary ethylene-propylene rubber roller during use, which leads to a decrease in product quality and a short service life of the roller.

The invention discloses a rough rolling process for preparing a high-strength high-ductility magnesium alloy sheet. In the rough rolling step, the rolling speed of each rolling pass is controlled to be 50-100 m/min, and the rolling reduction of each rolling pass is controlled to be 60%-90%. The invention further discloses a method for preparing the high-strength high-ductility magnesium alloy sheet. The method comprises the rough rolling process. According to the rough rolling process and method for preparing the high-strength high-ductility magnesium alloy sheet, the rolling speed is high, the rolling reduction is large, the average grain size of a magnesium alloy slab obtained after the rough rolling step is less than or equal to 20 microns, the magnesium alloy sheet manufactured after subsequent warm rolling is good in rolled plate shape, and in the case of the magnesium alloy sheet, the yield strength is larger than or equal to 220 MPa, the tensile strength is larger than or equalto 290 MPa, and the elongation percentage is larger than or equal to 15%.

The invention relates to a differential-thickness rolling method for a medium-thickness plate, and belongs to the technical field of production of medium-thickness plates in the metallurgical industry. According to the technical scheme, the number of passes of differential-thickness rolling is even, the first pass of differential-thickness rolling adopts the mode that the reduction rate is gradually increased, the thicknesses of a steel plate rolled by the first pass of differential-thickness rolling in the length direction are different, the upper surface of the steel plate has a certain gradient, the thinner end of the steel plate is engaged into the second pass of differential-thickness rolling, and in the second pass of differential-thickness rolling, the reduction rate is also gradually increased, the steel plate with the upper surface having the certain gradient is rolled into a flat plate with the consistent thickness in the length direction, and so on until the last pass of differential-thickness rolling. The method has the beneficial effects that low-pressure engagement and high-pressure steel throwing can be realized through differential-thickness rolling, so that the rolling reduction of the steel plate is greatly increased, the deformation of the core part of the steel plate is increased, the deformation is promoted to spread deep into the core part of a rolled piece, the performance of the steel plate is improved, the number of rolling passes can be reduced, and the rolling efficiency is improved.

The invention belongs to the technical field of the production of plate blanks, and particularly discloses a convex foot roller for continuously casting a plate blank and a method for improving the center segregation and porosity of the continuously cast plate blank. The method aims at solving the problems how to weaken the center segregation of the continuously cast plate blank and lighten the center porosity of the continuously cast plate blank. The convex foot roller for continuously casting the plate blank comprises a roller body and a bulge structure, wherein the bulge structure is arranged on the roller body; the bulge structure comprises an intermediate bulge arranged in the middle of the roller body and two lateral bulges symmetrically arranged on the roller body. The method for improving the center segregation and porosity of the continuously cast plate blank comprises the following steps of carrying out pressing-down treatment on the continuously cast plate blank entering a secondary cooling zone by adopting a pulling-straightening machine with the convex foot roller. The convex foot roller for continuously casting the plate blank can be used for pressing down the continuously cast plate blank in a targeted manner in the form of a solidification zone during a solidification last phase; molten steel containing an enriched segregation element in the continuously cast plate blank is effectively stopped from flowing to accordingly weaken the center segregation and meanwhile, the solidification contraction amount of the continuously cast plate blank is compensated to lighten the center porosity of the continuously cast plate blank.

The invention discloses a cold straightening process for improving the straightening capability through the reduction of the number of working rolls of a straightener. In the step of the first pass large plastic deformation straightening, the number of the working rolls actually performing straightening is determined; one or two upper working rolls on the outlet side do not perform straightening; roll gaps of the inlet and the outlet are set; and the roll gap of the inlet is calculated according to a secondary model and based on a condition that a steel plate plastically deforms by 80%. In the step of the second pass small plastic deformation straightening, all the working rolls perform straightening; the roll gap of the inlet is calculated according to the secondary model and based on a condition that the steel plate plastically deforms by 65%; and the roll gap of the outlet is designed to be the thickness of a plate to be straightened. According to the invention, through the reduction of the number of the working rolls actually performing straightening on the outlet side of the straightener, the load of the straightener is reduced, the rolling reduction of the inlet of the straightener is increased, the maximum bending curvature of the steel plate is increased, the straightening capability of the straightener is enhanced, and the straightening qualified rate of the steel plate is improved.