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

A method for a rolling mill to roll round steel with the diameter phi of 120mm and round steel with the diameter phi of 130mm by one roller set includes the ten-pass design of a 650mm rolling mill and a regulating method thereof. The two types of round steel share the first, second, third, fourth and fifth passes and the eighth pass of leader passes. When in rolling of the round steel with the diameter phi of 120mm, the roller gap of the upper rolling line is 6mm, feeding is carried out after 90-degree rotation from the seventh pass to the eighth pass. When in rolling of the round steel with the diameter phi of 130mm, the roller gap of the upper rolling line is regulated to be 11mm, feeding is carried out from the fifth pass to the eighth pass after the sixth pass and the seventh pass arecast off, the third pass and the fifth pass meet the requirement for the entry width of the previous pass in the processes of rolling the round steel with the diameter phi of 120mm and the round steel with the diameter phi of 130mm simultaneously, the eighth pass meets requirements of the round steel with the diameter phi of 120mm and the round steel with the diameter phi of 130mm simultaneously,the width B of the eighth pass meets requirements of the round steel with the diameter phi of 130mm, and the height H thereof meets requirements of the round steel with the diameter phi of 120mm. By the method, the rolling mill can roll the round steel in two specifications by the same roller set, and roller changing frequency and time due to alternating of the two specifications can be reduced.

The invention relates to a method for rolling square steel. A frame is at least provided with a frame group consisting of an elliptical hole frame and a round hole frame, and a diamond hole frame and a square hole frame are connected behind the frame group. By the method for rolling the square steel, for steel rolling manufacturers which are put into operation, when square steel and round steel products are collinearly rolled by the same set of continuous rolling unit, the phenomenon of round steel hole pattern accompanying turning caused by nonuniform rolling yield can be effectively avoided, the utilization rate of a roller can be effectively improved, the consumption of the roller is reduced, and times for changing the roller can be reduced; the types of hole patterns are reduced, the sharing performance of on-line hole patterns is greatly improved, the times for changing the roller in a rolling line are reduced, and the roller is fully utilized; fishtail at the tail of a rolled piece, which is formed due to nonuniform deformation, has small length, so that the yield of the rolled piece is improved; the stress concentration of the roller is relatively small, so that risk that the roller is broken is reduced; and a tilting gear in front of a continuous rolling machine is saved, so that equipment investment is reduced.

The invention discloses a furnace roller surface anti-dross device of a strip steel annealing furnace, belongs to the equipment of strip steel thermal treatment, and in particular relates to a continuous strip steel annealing furnace. The furnace roller surface anti-dross device is characterized in that a gas inlet pipeline is arranged on a nitrogen conveying tube; the gas outlet end of the gas inlet pipeline is connected with a nitrogen humidifying device through a nitrogen inlet valve, a depressurizing valve, a wet gas adjusting valve and a dry gas adjusting valve; the nitrogen humidifying device is connected with a wet gas nozzle at the bottom of a uniform heating section of the annealing furnace through a wet gas inlet adjusting valve and an injection pipeline; and a gas path is formed by the gas inlet pipeline, the nitrogen humidifying device, the injection pipeline and the annealing furnace. The furnace roller surface anti-dross device has the advantages that the dew point of the atmosphere of the uniform heating section inside the annealing furnace is minus 27 DEG C to minus 35 DEG C, gas particles with high dew points are firstly enriched at rough valley points of a non-strip steel contact surface of a furnace roller, the high temperature strip steel from the heating section wraps the gas particles, and the gas particles are heated to expand, so that the sponge iron on the strip steel is effectively prevented from being bonded into dross on the furnace roller, the product quality is improved, the times of opening the furnace to replace the roller are reduced, the cost of spare parts and the production cost are lowered, and the product yield and the machine set working rate are increased.

The invention relates to a tungsten carbide roller. The tungsten carbide roller comprises the following components of: 84.5 to 85.5 percent of WC, 6.8 to 7.5 percent of Co, 6.8 to 7.5 percent of Ni, 0.2 to 0.5 percent of TiC, 0.2 to 0.5 percent of CrC, and 0.1 to 0.3 percent of VC. The mixed raw material powder is molded by an isostatic pressing process, and a roller blank is subjected to vacuum sintering treatment at the temperature of between 1,390 and 1,490 DEG C. Because a mixture of cobalt and nickel elements, titanium carbide, chrome carbide and vanadium carbide of hard alloy phase with extremely good bonding performance is added, the composition of the tungsten carbide roller is improved, and a reasonable internal tissue structure is formed. By reasonably selecting the sintering temperature in the vacuum state, defects of under sintering, over sintering and deformation are avoided, the tungsten carbide roller with good comprehensive performance is obtained, the rolling quantity of single-roll single rolling rings is improved by over two times, workload and expenditure of roller replacement are reduced, the work efficiency of the roller is improved, and the quality of wire products is ensured.

The invention discloses a tungsten carbide roll collar formula being capable of effectively solving the problems of low combination property and low rolling amount of the traditional tungsten carbide roll collar. The tungsten carbide roll collar formula comprises the following components in weight percentage: 93-98 percent of WC, 1.5-5 percent of Co, 0-4 percent of Ni, 0.2-0.3 percent of TiC, 0.2-0.3 percent of CrC, 0.05-0.3 percent of VC and 0.05-0.1 percent of Y. The invention has the advantages that the raw material composition and the component proportion of a tungsten carbide roll are improved so that the tungsten carbide roll has the internal condition formed by an internal organization structure meeting the service performance requirement, and moreover, the roll collar has small abrasion loss, smooth surface and long service period, cannot be broken and has low roll replacing frequency, and thus, the roll replacing work load is reduced, the cost is reduced, the operating rate of a rolling mill and the product quality are improved and the inherent quality and the surface quality of produced wire rod products are ensured.

The invention relates to a high-speed reeling machine, and particularly relates to a high-speed reeling machine for reeling steel belts rolled by a rolling mill. The high-speed reeling machine comprises a base which is provided with a stander; the stander is provided with an electric motor, a speed reducer and a reel; an output shaft of the electric motor is fixedly connected with an input shaft of the speed reducer and an output shaft of the speed reducer is fixedly connected with the reel; the outer end of the reel is arranged on a first bracket by means of a shaft; and a winding drum is sleeved on the reel in a reeling state. The high-speed reeling machine is characterized in that the base is provided with two rails parallel to each other; and two columns of rollers are arranged at the bottom of the stander, are respectively arranged in the corresponding rails and can roll along the longitudinal direction of the rails. A second bracket is arranged on one side, far away from and opposite to the reel, of the base, a first hydraulic oil cylinder is fixed on the second bracket, and a piston rod of the first hydraulic oil cylinder is hinged with the stander together. The high-speed reeling machine is used for reeling steel belts, and is large in reeling diameter and high in reeling precision.

The invention discloses a production method with low energy consumption, 24 passes and high efficiency for hot rolling of a phi-8 coiled reinforced bar. The production method comprises four rolling mills for rough milling, six rolling mills for intermediate rolling, four rolling mills for finish rolling of bars and ten rolling mills for finish rolling of wires, wherein 1H to 3H racks roll by adopting a slotless form; 4V to 14V racks and No.15 to No. 24 racks roll by adopting a round/elliptical pass form; the 14V rack produces rolled pieces which are round bars of 24+/-0.5mm; the pass width of the No.15 rack is 32.1-32.3mm, and the pass height is 16.15-16.30mm. According to the production method disclosed by the invention, by meticulously designing pass parameters of all the passes prior to the wire finish rolling mills for the hot rolling of the phi-8 coiled reinforced bar, and controlling the size and the precision of incoming bars for wire finish rolling, the safety of a motor of the wire finish rolling mill is guaranteed; the elongation percentage is reasonably distributed by the wire finish rolling racks, so that the phi-8 hot-rolled coiled reinforced bars are rolled on the 24 racks. Compared with a mode of rolling by 26 racks in the prior art, the mode disclosed by the invention has the advantages that the consumption of spare parts and the production energy consumption can be greatly reduced, and the production efficiency is improved.

The invention relates to the field of disposable sanitary product production processes, in particular to an uncoiling process of a winding coil material. The uncoiling process mainly solves the problem that in the prior art, an uncoiling process of a narrow non-woven fabric winding coil material is adopted to reduce waste of joint wastes as the joints are relatively long and to lower the processing cost. The process comprises the following steps: (1) separately assembling two non-woven fabric winding coils on an unwinding device for emptying; (2) limiting the emptied non-woven fabrics througha round ring limiting device in an early stage; (3) realizing forward overturning of the limited non-woven fabrics at a clamping mechanism by means of clamping roller action on the clamping mechanismfirst and then realizing reverse overturning under the action of another clamping roller; (4) after overturning, arranging a flattening device to flatten the non-woven fabrics to remove folded wrinkles in the overturning process; and (5) carrying out sweat soldering on the flattened non-woven fabrics through a material breaking and connecting device.

The invention relates to the field of iron and steel smelting, in particular to a method for prolonging the service life of a bar slitting and rolling finished product hole. The method for prolongingthe service life of the bar slitting and rolling finished product hole comprises the steps: after the bar is cut, a first-section rolled piece and a tail-section rolled piece are included; the first-section rolled piece and the tail-section rolled piece are conveyed to a finished product hole after being twisted by a twisting guide; the first section rolled piece and the tail section rolled pieceare respectively twisted by the twisting guide; and during twisting, the first rolled piece and the tail rolled piece are twisted in a mirroring mode. The slitting ends are twisted toward the direction of an identifier, so that the slitting ends with higher temperature can be always in contact with the identifier in the finished product hole, and the first end and the second end of the bar with lower temperature can be prevented from being in contact with the identifier in the finished product hole. Therefore, the situation that the finished hole is integrally replaced due to different abrasion degrees of the finished hole caused by uneven temperature can be avoided. Further, the service life of the finished product hole can be effectively prolonged.

The invention provides a rough rolling pass system for flexible rolling of H-shaped steel and a rolling method. The rough rolling pass system is composed of a flat rolling pass and a vertical rolling pass, the flat rolling pass is used for reducing the thickness of a web of a special-shaped billet, compressing the width of a flange and controlling the width of the inner side of the web, the vertical rolling pass is used for vertically pressing the special-shaped billet, the height of the inner side of the web is reduced to different sizes, and intermediate billets required by production of the H-shaped steel of different types are obtained. According to the system, the same roughing mill pass system can produce the intermediate billets required by different types of H-shaped steel. When the H-shaped steel with the same flange width and different types is produced, one roughing mill can finish rolling of multiple types of intermediate billets, rollers of the roughing mill do not need to be replaced, only the finish rolling mill needs to be replaced, the roller replacing frequency is greatly reduced, the production efficiency is improved, and the number of the rollers and the production cost are reduced.

The invention discloses a tip device with large radial bearing force. The tip device comprises a tip unit and a tip base, and the tip unit is installed on the tip base; a morse tapered hole is formedin the tip base and used for the tip unit to be placed in; the tip unit comprises a tip core, and a first bearing installing area, a second bearing installing area and a third bearing installing areaare successively arranged on the tip core. The radial bearing force of the tip device is greatly improved, so that the maximum ribbon rolling weight of a ribbon rolling machine every time is increased, the frequency of lap changing is reduced, the loss on defective products is reduced, and the social benefit of the tip device is huge.

The invention provides a hot-rolled strip steel vertical roller mill machine frame rising and falling structure comprising a bearing base and a machine frame. The machine frame is vertically installedon the bearing base in a sliding manner. Rising and falling devices and adjusting devices are arranged at the position, corresponding to the machine frame, on the bearing base, wherein the rising andfalling devices and the adjusting devices are used for regulating rising and falling of the machine frame. Each rising and falling device comprises a jacking hydraulic cylinder, wherein the jacking hydraulic cylinders are arranged on the portions, corresponding to the periphery of the machine frame, on the bearing base, and connection mechanisms matched with the jacking hydraulic cylinders are arranged on the machine frame. The hot-rolled strip steel vertical roller mill machine frame rising and falling structure is simple in structure, stable and reliable, and multiple work positions can bearranged on each same roller in the height direction; by making the machine frame rise and fall, adjustment of the different work positions is achieved, and the utilization rate of the rollers is increased; by decreasing the number of roller replacement times, the rolling efficiency is improved; and meanwhile, rising and falling of the whole machine frame are achieved through the rising and falling devices, the hot-rolled strip steel vertical roller mill machine frame rising and falling structure can be suitable for changes of rolling elevations under specific conditions, and the application range of mill devices is widened.