34results about How to "Reduce broken belt" patented technology

The invention provides a production method for intermediate-frequency magnetic shielding silicon steel. The production method comprises the steps of smelting, continuous casting, hot rolling, pickling, cold rolling, annealing, coating, performance testing and packaging; as for smelting, molten steel is smelted until the silicon content is 2.0%-3.5%, and other element ingredients are smelted to target ingredients; as for continuous casting, the molten steel superheat degree is 20-60 DEG C, a charging device is arranged in a continuous casting crystallizer, steel particles are added into the molten steel in the charging device, the added steel particles need to be heated to 400 DEG C or above, the mass percentage content of steel particle silicon is 0.5%-2.0% higher than the mass percentagecontent of target ingredient silicon, other element ingredients are the same as the target element ingredients, and the particle size of steel particles is 1.0-5.0 mm; the steel particles exist in a casting blank in a molten state or semi-solid state; and as for annealing, the annealing temperature is 600-1000 DEG C, and the temperature holding time is 10-400 min. The production method adopts lowsilicon electric steel to protect hot rolling heating oxidation of high silicon electric steel, and the yield is improved.

The invention relates to the technical field of steel and iron smelting, discloses a control method for preventing high-magnetic-induction oriented silicon steel cold rolling strip breakage, and aims at solving the problems that in the prior art, high-magnetic-induction oriented silicon steel is prone to breakage, oxidation and the like during cold rolling, the following scheme is provided, the control method comprises the following steps that firstly, a circle shear is used for trimming, and a steel strip is obtained; edge defects possibly existing in the hot-rolled steel strip are cut off; secondly, a bell-type furnace is adopted for gas protection preheating before cold rolling, the preheating temperature of a steel coil is 40-100 DEG C, and the preheating time is 6-18 h; and thirdly, transverse temperature distribution of the steel strip is controlled through emulsion cooling in the rolling process. According to the method, the edge tension is prevented from being too large through trimming before cold rolling, gas protection preheating of the steel coil and control over transverse temperature distribution of the steel strip in the rolling process, and therefore the steel strip is effectively prevented from being broken in the rolling process.

A fast sample plate calibration method of a gamma-ray thickness gauge is mainly used for detecting the thickness of silicon steel. The method comprises the steps that 1, physical measurement is carried out on silicon steel sample plates of different thicknesses to obtain the absolute thickness values of the sample plates of all the thicknesses; 2, the silicon steel sample plates of the different thicknesses are manually measured on the gamma-ray thickness gauge one to five times, and the average manual measurement thickness value is calculated; 3, the thickness deviation value of the sample plates is calculated; 4, a compensation factor is determined, and meets the conditions that the absolute value of the thickness deviation value of the silicon steel sample plates with the thickness of 0.5 mm is not larger than 3 micrometers, and the absolute value of the thickness deviation value of the silicon steel sample plates of other thicknesses is not larger than 6 micrometers; and 5, the compensation factor is stored and calibrated on the gamma-ray thickness gauge. Calibration time ranges from 45 minutes to 1 hour; the number of times of starting a radiation source is 1 / 5 of original calibration time; calibration precision is higher than calibration of an original procedure; and the thickness quality of finished steel plates is improved.

The invention provides an annealing method of cold-rolled non-oriented electrical steel thin strips, which comprises the following steps: 1) performing normalized acid pickling, then performing cold rolling to reach a thickness of 0.15-0.20 mm, uniformly spraying a MgO aqueous solution on a steel plate surface in a cold rolling final finished product pass process; 2) after cold rolling, performing cover annealing by coils under the protection of N2+H2, wherein the volume percent of N2 is 10%-90% and the volume percent of H2 is 10%-90%, performing heat preservation at 400-500 DEG C for 2-10 hours, then performing recrystallization annealing at 850-1000 DEG C for 8-20 hours; 3) washing off the MgO coating with 3%-8% diluted H2SO4 before stretching annealing, performing stress-relieving annealing at 500-900 DEG C, and applying tension force which is controlled to be 0.8-5 KN. The method of the invention adopts cover furnace annealing, and performs a stretching flattening process after annealing, which not only obtains excellent electromagnetic performance, but also ensures good plate shape, greatly increases the yield, reduces strip breaking, and increases the yield by 10%-20%. The method of the invention is widely applicable to variable frequency motors, and extends the application field of electrical steel.

The invention discloses a preparation method for micron-grade titanium foil. The preparation method comprises the steps that firstly, a titanium belt is fed into a rolling mill to be subjected to primary rolling, and a primary rolled titanium foil semi-finished product is obtained; second, after being washed, the primary rolled titanium foil semi-finished product is fed into a vacuum furnace to be subjected to heat preservation treatment; thirdly, the primary rolled titanium foil semi-finished product is fed into the rolling mill to be subjected to secondary rolling, and a secondary rolled titanium foil semi-finished product is obtained; fourthly, after being washed, the secondary rolled titanium foil semi-finished product is fed into the vacuum furnace to be subjected to heat preservation treatment; fifthly, the secondary rolled titanium foil semi-finished product is fed into the rolling mill to be subjected to tertiary rolling, and a tertiary rolled titanium foil semi-finished product is obtained; and sixthly, after being washed, the tertiary rolled titanium foil semi-finished product is fed into the vacuum furnace to be subjected to heat preservation treatment, and the finished titanium foil product is obtained. According to the preparation method, the technological process is simple, energy sources are saved, the energy consumption is low, the production efficiency is effectively improved, the titanium foil with the thickness only being 0.007 mm-0.009 mm can be prepared, the titanium foil is smooth in surface, the defects of cracking, peeling, folding, obvious oxidation and impurity pressing-in are not caused, the titanium foil can replace an existing titanium foil product, and the titanium foil has wide market space and development prospects.

The invention discloses a production method of high-silicon electrical steel. Molten steel with the contents of two kinds of silicon being 2.0%-3.5% and 4.5%-7.0% correspondingly is smelted, and the superheat degree of the molten steel is 10-30 DEG C; a drainage device is arranged in a continuous casting crystallizer, opened downwards and suspended in the molten steel, the gap between the drainagedevice and the crystallizer is 10-40 mm, the high-silicon molten steel is added into the drainage device, low-silicon molten steel flows between the drainage device and the crystallizer, the pullingspeed is 0.4-0.9 m / min, the thickness ratio of a low-silicon blank shell to a high-silicon blank core of a cast blank is 1:2-1:5, inert gas is charged into the drainage device, and thus the internal liquid level of the drainage device is 10-20 mm lower than the external liquid level of the drainage device; the thickness of a hot-rolled roll is 0.8-1.8 mm; and before cold rolling, preheating is carried out to 200-450 DEG C, the annealing temperature is 600-1000 DEG C, and heat-preserving time is 10-200 min. Finished products have good electromagnetic performance and iron loss performance.

The invention discloses a supporting roll bearing base. A bearing hole is formed in the bearing base, the bearing hole is internally provided with a bearing, the bearing parallel with the upper part of the bearing hole is axially provided with a transparent arc-shaped through hole, the upper edges of two sides of the bearing base are respectively provided with a step along the axial direction of the bearing, the height of each step is 2 / 3 of the radius of a bearing outer ring. According to the structure, under the existing conditions that the size of the reduction force P and the direction of the roll force can not be changed, the force bearing point location of the bearing base is partly changed, part of supporting stiffness of the bearing base is changed on the maximal stress location of the bearing, so that the loading is uniformly bore by a roller in the bearing as far as possible, the peak load of a bearing rolling body is greatly reduced, the problems that the bearing is untimely burned and the life is obviously shortened are avoided.

The invention discloses a lithium-ion battery with high energy and high safety performance, which comprises a negative electrode sheet, a separator, a positive electrode sheet laminated or a wound electric core, wherein the positive electrode sheet contains a positive electrode current collector, a positive electrode active material, and a positive electrode conductive agent. , positive electrode binder and positive electrode additive; the negative electrode sheet contains negative electrode current collector, negative electrode active material, negative electrode conductive agent, negative electrode binder and negative electrode additive; it is characterized in that: the coating layer on both sides of the surface of the positive electrode current collector is PTC material, Aluminum powder and carbon nanotubes; the positive electrode additive is a mixture of PTC material, aluminum powder and graphene; the coating layer on both sides of the positive electrode sheet is PTC material and graphene; the coating layer on both sides of the negative electrode current collector surface is PTC material , copper powder and carbon nanotubes; the negative electrode additive is a mixture of PTC material, copper powder and graphene; the coating layers on both sides of the negative electrode surface are PTC material and graphene. The invention obtains high safety performance, ensures safety and at the same time improves the energy density of the battery, improves the electrical performance of the battery and improves the level of the production process.

The invention discloses a target board shape setting method. The target board shape setting method comprises: step S100, confirming a target board shape rolling force compensation value, a coverage rate compensation factor and an outlet thickness compensation factor at a rolling force fluctuation stage; step S200, confirming a target board shape side portion compensation value at the rolling force fluctuation stage; step S300, confirming a dynamic target board shape curve; finally step S400, obtaining board shape deviation according to the dynamic target board shape curve and a measured curve and performing belt material board shape adjustment. The target board shape setting method can improve the board shape material object mass of belt material side portion at the rolling force fluctuation stage and ensures the rolling stability and decrease broken belt situation and the like.

The invention relates to the field of production methods of electrical steel, and particularly relates to a method for preventing high-silicon electrical steel from being broken during cold rolling. The method is characterized in that specific to high-silicon electrical steel with the silicon content of above 2.0 and the thickness of 1.0-4.0 mm, cutters are arranged at the left side and the right side of a hot-rolled strip for performing a milling operation, an included angle alpha is formed between each cutter shaft and the moving direction of the hot-rolled strip, a rotating direction of a blade on each cutter is opposite to the moving direction of the hot-rolled strip, the moving speed of the hot-rolled strip is 5-40 m / min, when the depth of a side crack is less than 10 mm, a cutter is arranged at one side of the hot-rolled strip, and when the depth of a side crack is more than 10 mm, more than two cutters are arranged at one side of the hot-rolled strip for performing milling simultaneously. Compared with the prior art, the method has the beneficial effects of reducing the probability of strip breakage of high-silicon steel in a cold-rolling process, increasing the yield of high-silicon steel, being free from preheating and capable of realizing cold rolling at normal temperature, further reducing the probability of cracks by removing corner angles of a steel plate which is cut, and being capable of flexibly adjusting the trimming amount.

The invention discloses a method for monitoring and adjusting the vibration of a cold tandem rolling mill. In the method, the rolling speed for the current stand of the rolling mill to roll the strip steel is the set speed, and the thickness gauge is arranged between the current stand and the next one. Between racks, the initial strip thickness value h on the outlet of the current rack 1 Measured and compared with the strip thickness target value h 目标 Compare: when |h 1 ‑h 目标 |<H 0 , the rolling speed maintains the set speed; when H 0 ≤|h 1 ‑h 目标 |≤H 1 , first adjust the rolling speed to 50% of the set speed, and then adjust the tension between the current stand and the next stand to increase the tension by 1% to 8%; when |h 1 ‑h 目标 |>H 1 , first adjust the rolling speed to 20% of the set speed, and then send a shutdown signal; where, H 0 is the safe setting value, H 1 is the critical set value. The invention realizes the normal and stable production of the continuous cold rolling mill and improves the production efficiency of the cold rolling production line.

The invention belongs to the technical field of non-ferrous metal processing, and relates to a production process for preparing aluminum foil for lithium batteries with high-hardness rolls, including: aluminum foil blanks use rough rolls with a roughness Ra: 0.25um at a reduction rate of 0.26mm-0.13 at a reduction rate of 50%. mm‑0.065mm pass rolling, after the 1st and 2nd pass rough rolling, and then roll the 3rd and 4th pass with roughness Ra: 0.10um medium roll; Pass finish rolling, the pass is 0.017mm-0.012mm, edge trimming, to obtain aluminum foil with a thickness of about 0.012mm; the roughness of the finish roll used is Ra: 0.07um, and the surface hardness of the middle roll and finish roll is 20-20% higher than that of ordinary rolls 25HSD; slitting, corona, etc. The invention utilizes high-hardness rollers to produce lithium battery foil, improves the deformation resistance of the rollers, enhances the stability of the roller shape under high rolling force during the battery foil production process, and achieves the shape stability of the aluminum foil produced. The lifting speed is 20% faster than that of ordinary finishing rolls, and there are fewer broken strips. The yield of battery foil is more than 15% higher than that of ordinary rolls, and the surface dyne value is 1-2 dyn higher than that of battery foils produced by ordinary rolls.

The invention discloses a flash welding technological method for the head and the tail of non-oriented electrical steel used in cold-rolling pickling line and tandem cold mill to enhance the quality of the weld joint. The technological method comprises the following steps: a low-carbon steel material with the same thickness and width is inserted between a front roll of non-oriented electric steel and a back roll of non-oriented electric steel; the head of the low-carbon steel material is welded with the tail of the back roll of non-oriented electric steel and the tail of low-carbon steel material is welded with the head of the back roll of the non-oriented electric steel. The flash welding technological method for the head and the tail of a non-oriented electrical steel used in cold-rolling pickling line and tandem cold mill has the advantages that due to good plasticity and toughness, the quality of the weld joint of the non-oriented steel after welding is greatly enhanced without lap joint and is qualified in the on-site cupping test, avoiding thrust belt of the joint; the weld joint can not only pass through the acid, but also normally through the miller for rolling, without need of reducing pressure, tension or speed, therefore, the technological method is particularly suitable for popularization in band steel manufacturing of cold-rolling pickling line and tandem cold mill.