52results about How to "Reduce the risk of belt breakage" patented technology

The invention relates to the field of silicon steel cold rolling, and discloses a cold rolling method for high grade non-oriented silicon steel through hot rolling, acid pickling and non-edge-cutting.The cold rolling method comprises the following steps that a steel coil is obtained, non-edge-cutting normalizing acid pickling is carried out, then a one-time cold rolling method is adopted for continuous reversible type five-pass cold rolling, the reduction rate, rolling force, entry side unit tension and exit side unit tension of each pass are controlled, emulsified liquid spraying is adoptedin rolling for process lubricating and cooling, thermal expansion adjustment steel coil plate shape of a working roll is controlled in a partitioned cooling mode, a rolled product is obtained, and then subsequent procedures are conducted conventionally. The cold rolling method for high grade non-oriented silicon steel through hot rolling solves the problems of poor rolling efficiency and poor finished product rate of high silicon content varieties.

The invention relates to ferritic stainless steel with good wrinkle resistance and a production method thereof. The ferritic stainless steel comprises the following components by weight percentage: less than or equal to 0.02 percent of C, less than or equal to 0.02 percent of N, 0.10-0.50 percent of Si, 0.10-0.50 percent of Mn, less than or equal to 0.03 percent of P, less than or equal to 0.01 percent of S, 16-30 percent of Cr, less than or equal to 1.00 percent of Ni, 0.15-0.40 percent of Nb, less than or equal to 16 percent of Nb/(C+N), less than or equal to 0.010 percent of O, less than or equal to 1.00 percent of Cu and the rest being Fe and inevitable impurity elements. Since the stabilization element Ti which can damage the surface quality of continuous casting and increase the brittle transition temperature is not added, and only the stabilization element Nb is added, the invention can reduce the quantity of casting blank repair and the strip breakage risk, improve the surface quality and overall performance, eliminate the wrinkle of the surface of the ferriticstainless steel cold-rolled plate with a medium and high Cr content, reduce the wear and repair loss during the production process, and decrease the production cost.

The invention discloses high-efficiency non-oriented silicon steel and a preparation method thereof. The high-efficiency non-oriented silicon steel comprises the chemical components in percentage by mass of at most 0.005% of C, 1.0-2.0% of Si, 0.2-0.8% of Als, 0.25-0.8% of Mn, 0.01-0.05% of Sn, at most 0.02% of P, at most 0.0040% of S, at most 0.0020% of N, at most 0.0020% of Nb, at most 0.0020% of V, at most 0.0020% of Ti and the rest of Fe and unavoidable impurities. The high-efficiency non-oriented silicon steel and the preparation method have the advantages that by the strict component control in steelmaking, the impurity elements meeting the target requirement is ensured; by hot skin rolling, high temperature normalizing, induction heating before cold rolling, annealing and rapid warming and a low temperature long-time insulation process, the high-efficiency non-oriented silicon steel is obtained; and the iron loss of a finished product is P1.5/50<=3.2W/kg, and magnetic inductionis B50>=1.73T.

The invention discloses a lap resistance welding method of high-strength strip steel with the carbon equivalent being greater than 0.5. The lap resistance welding method comprises the following steps that a high-strength steel plate is welded on a narrow lap resistance welding machine; and after the welding is completed, a postweld heat treatment technology is carried out. The high-strength strip steel mainly comprises the following chemical components, by weight percentage, less than or equal to 0.30% of C, less than or equal to 0.80% of Si, less than or equal to 1.50% of Mn, less than or equal to 0.035% of P, 0.030% of S and the balance Fe and other microelements. The tensile strength Rm of a rolled hard coil of the high-strength strip steel is greater than or equal to 800MPa. By adopting an automatic resistance welding technology for connecting the strip steel and by matching with postweld heat treatment, the welding residual stress is eliminated, a welding joint structure is improved, and continuous stable production of high-strength steel plate products is ensured.

The invention discloses a flying gauge change method for a five-rack tandem cold mill. The method comprises the following steps of determining a transition region of flying gauge change; calculating a transition coefficient according to the length of the transition region, the original thickness of band steel before rolling of each rack and the set thickness of the band steel after rolling of each rack; in a transition process, calculating a dynamically adjusted roll gap set value of each rack according to the transition coefficient, and regulating the band steel outlet speed of each rack according to reverse flow. By the adoption of the flying gauge change method, a flying gauge change process of the five-rack tandem cold mill can be optimized, the stability of the flying gauge change is improved, equipment impact is reduced, the out-of-tolerance of the band steel is reduced, the speed of the flying gauge change is increased, and the time of the flying gauge change is shortened.

The invention discloses a flying gauge change control method of a tandem cold mill. The method comprises the following steps: determining a transition region of flying gauge change, computing transition coefficients according to the length of the transition region, the original thickness of strip steel before the strip steel is rolled by a frame and the set thickness of the strip steel after the strip steel is rolled by the frame, computing a roll gap set value for dynamic adjustment of each frame according to the transition coefficients when a transition process is performed, and adjusting the strip steel discharge speed of each frame according to fair current. By adopting the method, the flying gauge change process of the tandem cold mill can be optimized, the smoothness of flying gauge change is improved, equipment impact is reduced, out-of-tolerance of strip steel is reduced, the speed of flying gauge change is increased, and the time of flying gauge change is shortened.

The invention relates to a rapid start method for a vertical continuous annealing furnace. By adoption of the rapid start method for the vertical continuous annealing furnace, the problem that in theprior art, after a vertical continuous annealing furnace is stopped to be maintained, the furnace start time is long, and consequentially, the production rhythm and productivity are affected is solved. The rapid start method for the vertical continuous annealing furnace comprises the steps that after the vertical continuous annealing furnace is maintained, start conditions of the vertical continuous annealing furnace are confirmed; pure-nitrogen purging is conducted on the inside atmosphere of the vertical continuous annealing furnace; the vertical continuous annealing furnace is heated; hydrogen-containing purging is conducted on the inside atmosphere of the vertical continuous annealing furnace; and strip steel of the vertical continuous annealing furnace is controlled to start to operate. The rapid start method for the vertical continuous annealing furnace is simple and easy to operate, and the production efficiency and productivity of the vertical continuous annealing furnace are effectively improved.

The invention relates to the technical field of strip steel rolling, in particular to a control method and equipment for suturing and centering thin strip steel for a continuous annealing furnace. According to the control method and equipment, centering devices and side measuring devices are respectively adopted in the front and the back of suturing equipment, the centering devices are mainly used for detecting whether the center position of the strip steel moving forwards and the center position of the strip steel moving backwards are located in the center position of a unit, and the side measuring devices are mainly used for detecting whether the strip steel moving forwards and the strip steel moving backwards are placed right, namely whether the center line of the strip steel is parallel with the center line of the unit; a horizontal-moving hydraulic cylinder and a rotating hydraulic cylinder are respectively installed in front and back of the suturing equipment, the strip steel in front of the suturing equipment and the strip steel in back of the suturing equipment can be placed right and centered through cooperation between a first correction roller and a second correction roller, the suturing accuracy can be improved greatly, the strip breakage risk of the unit is lowered, and production is more smooth. According to the control method and equipment, the technical problems that existing control methods are poor in suturing accuracy and the strip breakage risk exists especially when the strip steel in front and the strip steel in back are different in width are solved.

The invention relates to the technical field of secondary batteries, in particular to an anode plate, a secondary battery thereof and a preparation method. The anode plate comprises an anode current collector, an anode active material layer and a lubricating coating layer, wherein the anode active material layer is positioned on the anode current collector; the lubricating coating layer is positioned on the anode active material layer; the lubricating coating layer comprises modified silicone oil. The anode plate has the advantages that the cold-press ductility is decreased; by arranging the lubricating coating layer on the anode plate, the flexibility of the anode plate is improved, the cold-press pressure of cold-press equipment and the ductility of the anode plate are reduced, the high-quality rate in a cold-press procedure is improved, the loss of the cold-press equipment is reduced, the belt breaking risk in the cold-press process of the anode plate is decreased, and the manufacturing cost of the cold-press procedure is reduced.

The invention discloses a welding line stretching and bending experimental instrument. The welding line stretching and bending experimental instrument comprises an upper clamp, a lower clamp, a swing arm and an adjustment assembly, the upper clamp and the lower clamp are used for clamping a welding line test piece, the adjustment assembly is used for adjusting a vertical position of the upper clamp, the lower clamp is movably connected to the swing arm, the swing arm is located above the lower clamp and can turn over relatively to the lower clamp, the upper clamp is arranged on the swing arm by the adjustment assembly, and the upper clamp can vertically move relatively to the swing arm by adjustment of the adjustment assembly. The experimental instrument can simulate cold rolling production line-produced loads on a welding line, improve welding line detection reliability and provide quantification basis for welding line quality evaluation.

The invention relates to a method for preventing weld seam strip breakage of thin material strip steel. The method is characterized by comprising the following steps of (1) welding control; (2) entryloop control; (3) continuous annealing control; (4) air knife control; and (5) leveling and withdrawing-straightening control. The method effectively avoids the technical problem of the weld seam strip breakage of the strip steel through the coordinated control of multiple steps.

The invention discloses high-grade non-oriented silicon steel and a production method thereof. The production method comprises the steps of smelting, continuous casting, hot rolling, acid pickling, trimming, normalizing and cold rolling. The molten steel finally obtained through smelting comprises the following chemical components in percentage by mass: less than or equal to 0.005% of C, more than or equal to 2.8% of Si, 0.5-1.2% of Als, 0.25-0.8% of Mn, less than or equal to 0.02% of P, less than or equal to 0.0040% of S, less than or equal to 0.0020% of N, less than or equal to 0.0020% of Nb, less than or equal to 0.0020% of V, less than or equal to 0.0020% of Ti and the balance of Fe and inevitable impurities. In the edge cutting procedure, the two sides of the hot-rolled coil plate are subjected to edge cutting, and the shearing width of the single side is 10-20 mm; normalizing is conducted in a cover type annealing furnace, the soaking temperature T is equal to (990-1010)-100 * [30 * (Si) + 20 * (Al)], the soaking time is 6 h, and then cooling is conducted; when the steel coil is cooled to a preset temperature T0 in the cover type annealing furnace, the steel coil is taken out and sent to a cold rolling line for cold rolling, the T0 is 120-180 DEG C, and the rolling force during first-pass rolling is constant and is 11000-12000 kN. According to the method, frequent strip breakage caused by high brittleness in the cold rolling process of the high-grade non-oriented silicon steel can be avoided.

The invention provides a method for pre-judging occurrence of oriented silicon steel cold rolling brittle failures. The method comprises the following steps of shearing and sampling 20-30 cm of an acid pickling strip head, and marking a working side and a transmission side on an obtained sample plate; and sending the taken sample plate to a welding seam detection punching machine, punching the sample plate through the punching machine, setting different punching machine pressures according to different steel strip thicknesses, and pre-judging whether a normalized coil has the brittle failure in the cold rolling process by observing the crack morphology after punching of the sample plate. According to the method, corresponding countermeasures can be formulated before cold rolling of strip steel, so that the loss caused by cold rolling strip breakage is reduced.

The invention discloses a car-frame-free elevator driven by a traction steel belt. The elevator comprises a bearing device, a driving device and a lift car, a bearing wheel is arranged at the top of the bearing device, the bearing wheel is sleeved with a traction steel belt, one end of the traction steel belt is connected with a first steel belt terminating device, and the other end of the traction steel belt sequentially penetrates through the driving device and the lift car and is connected with a second steel belt terminating device; a car roof beam is arranged at the top of the lift car, abase is arranged at the bottom of the lift car, the base is connected with the periphery of the car roof beam through vertical plates, the lower end of the base is connected with an installation frame, and car bottom wheels matched with the traction steel belt are arranged at the two ends of the installation frame. The first steel belt terminating device, the second steel belt terminating deviceand the driving device are arranged side by side in the horizontal length direction of the bearing wheel. The elevator has the characteristics of high space utilization rate, high safety and low maintenance cost.

The invention discloses an automatic roll changing device, which comprises a first unwinding mechanism, a second unwinding mechanism and a mounting plate, and the first unwinding mechanism and the second unwinding mechanism are fixedly arranged on the mounting plate; wherein the first unwinding mechanism comprises a first unwinding device and a first connecting device; the second unwinding mechanism comprises a second unwinding device and a second connecting device; and the first connecting device is matched with the second connecting device, so that winding objects on the first unwinding device and the second unwinding device can be connected with each other to complete roll change. The matched roll change of the first connecting device and the second connecting device replaces manual roll change in a modern roll changing device, the risk of belt breakage caused in the operation process of personnel can be greatly reduced, and the efficiency and the yield are improved.

The invention discloses an oriented silicon steel annealing sleeve and an oriented silicon steel annealing method. The oriented silicon steel annealing sleeve comprises a tubular sleeve body and at least two grooves evenly formed in the outer wall of the sleeve body; the length direction of the grooves is parallel with the axial direction of the sleeve body; and one end face of each groove and theupper end face of the sleeve body are located in the same plane. The oriented silicon steel annealing method comprises the steps that the oriented silicon steel annealing sleeve serves as an inner core to wind oriented silicon steel so as to obtain a steel coil; the steel coil is put into a furnace to be subjected to high-temperature annealing, and the upper end face of the sleeve body faces upwards in the high-temperature annealing process; and after high-temperature annealing is finished, the steel coil is conveyed to a stretching leveling machine to be uncoiled, and then the oriented silicon steel annealing sleeve is taken down. The oriented silicon steel annealing sleeve and the oriented silicon steel annealing method can improve the uniformity of the temperature of the steel coil inthe high-temperature annealing process.

The invention provides a control method of reducing buckled material operation risk in an annealing furnace. The control method includes the following steps: (1) shut down and temperature reduction: when strip steel in the annealing furnace is found buckled, switching the annealing furnace into a temperature reduction mode and meanwhile shutting down the machine set in a sectionalized temperature reducing manner, when the machine set is shut down, releasing tension of each part in the machine set, powering-off fans in a quick-cooling section and a final-cooling section, powering-on a stabilizing roller and an air bellow in the quick-cooling section and a squeeze-drying roller in the final-cooling section, and relieving pressure of a buffer roller at inlet of the annealing furnace timely to ensure the strip steel at the inlet to be in a loosen status; (2) tension set: according to a tension formula, calculating the total tension of the process zones to obtain a total tension set value of the process zones; (3) operation of the machine set; and (4) abnormal situation treatment. The control method is high-effective and safe, is easy to carry out, is low in cost, and can reduce breaking risk of a buckled material in an in-furnace operation process effectively.