Main characteristics of steel rolling safety production2021-10-09
1，Classification of rolling steel Steel rolling is the production process of rolling steel ingots or continuous casting billets produced by steel mills into steel. According to its cross-section shape, the steel produced by the rolling method can be roughly divided into profiles, wires, plates and strips, steel pipes, and special steel products. Steel rolling methods can be divided into hot rolling and cold rolling according to different rolling temperatures; According to the relative motion relationship between rolled piece and roll during rolling, it can be divided into longitudinal rolling and cross rolling; According to the forming characteristics of rolled products, it can be divided into general rolling and special rolling. Spinning rolling and bending forming belong to special rolling. Rolling, like other processes, is to make metal plastic deformation and make it into a product. The difference is that steel rolling is carried out between rotating rolls. There are two categories of rolling mills, the main equipment of rolling mills or the main train of rolling mills, auxiliary machines, and auxiliary equipment. Equipment used to deform metal in rotating rolls is usually called main equipment. The operation line formed by the arrangement of main equipment is called the main train...
Classification and Quality Requirements of Crucible for Induction Furnace2021-10-08
(1) Classification of crucibles: There are three kinds of induction furnace crucibles according to materials, alkaline crucible, acidic crucible and neutral crucible. The most widely used binder is boric acid. The functions of boric acid in the manufacture of acidic (quartz sand) or alkaline (magnesia) crucibles are as follows: A, Reduce the sintering temperature. B, Promote the formation of spinel. C, Reduces the volume change rate of the crucible. According to the manufacturing methods, there are three manufacturing methods for crucibles: prefabricated shaped crucibles outside the furnace, shaped crucibles inside the furnace and masonry crucibles. (2) Quality requirements of crucible The main requirements for crucible refractories are: 1) High refractory and high temperature structural strength. 2) Good resistance to quench and heat. 3) Good slag resistance. 4) That thermal conductivity is as low as possible. 5) Insulation performance. 6) No pollution, no harm, low volatility, strong hydration resistance and low cost.
What should be considered when installing a small rolling mill?2021-09-30
There are strict requirements for the installation of small rolling mills, as well as rolling equipment, but there are still many differences between small rolling mills and other equipment, so special attention should be paid to the installation. Because of the complexity of the electrical control section of a small rolling mill, including one or more working stands and their transmission devices, the rolling line usually has a long process layout and a strict height difference between the equipment and the centerline. When installing the equipment on the rolling line on a soft soil foundation, the uneven settlement and displacement of the equipment should be considered. This is also the reason why the settlement observation point should be set up according to the center marking plate, reference point, rolling mill, and other equipment and regular measurement should be carried out before the installation of the rolling mill. Only when settlement and displacement become stable can the equipment be adjusted accurately. Because the working load of roller bearings is very heavy, the friction coefficient of bearings is required to be very small, and the bearings should have enough strength and stiffness to be easy to replace. Generally speaking, the mechanical properties...
Classification of Steel Rolling Mill2021-09-27
Steel Rolling Mill, the process of changing the shape of ingot and billet between rotating rolls, is called rolling. The purpose of steel rolling is the same as other pressure processing, on the one hand, in order to get the required shape, such as steel plate, strip, wire, and various types of steel; On the other hand, in order to improve the internal quality of steel, our common automobile plate, bridge steel, boiler steel, pipeline steel, rebar, steel, electrical silicon steel, galvanized sheet, tin plate, including the train wheel are processed through the steel rolling process. Rolling method according to rolling temperature can be divided into hot rolling and cold rolling; According to the relative motion relationship between the rolled piece and the roll, it can be divided into longitudinal rolling, cross rolling and cross rolling. The characteristics of rolling products can be divided into general rolling and special rolling. Cycle rolling, spinning rolling, and bending forming are all special rolling methods. In addition, due to the variety of rolling products, different specifications, some products are produced after several rolling, so rolling production is usually divided into semi-finished product production and finished product production two categories.
Features of Induction Furnace Series Heating Furnace2021-09-26
(1) The heating speed is fast, the production efficiency is high, the oxidation and decarbonization are less, and the cost of materials and forging dies is saved. Since the principle of intermediate frequency induction heating is electromagnetic induction, its heat is generated in the workpiece itself, ordinary workers can carry out continuous forging tasks ten minutes after going to work with intermediate frequency electric furnace, and no professional furnace burner is required to carry out furnace burning and furnace sealing work in advance. There is no need to worry about the waste of heated blanks of coal stoves caused by power failure or equipment failure. Due to the fast heating speed of the heating method, oxidation is very little, steel raw materials are saved by at least 20-50 kg per ton of forgings compared with coal-burning stoves, and the material utilization rate can reach 95%. Because the heating method is uniform in heating and the temperature difference between the core and the surface is extremely small, the service life of the forging die is greatly increased in forging, and the roughness of the forging surface is less than 50um. (2) The working environment is superior, the working environment of workers...
Medium frequency electric furnace induction coil common failures and their hazards2021-09-24
MF furnace induction coil is a load of MF power supply, usually with a wall thickness of 3 to 5 mm square copper tube wound. The common faults are as follows: 1. The induction coil is leaking the water, which may cause ignition between the turns of the coil. Repair welding must be carried out in time before the operation. 2. The molten steel sticks to the induction coil, the steel slag will get hot and red, which will cause the copper pipe to burn through. It must be cleaned in time. 3. The induction coil turns short circuit, this kind of fault in a small induction heating furnace is particularly prone to occur. Because the furnace is small, and it will be deformed in the work of the thermal stress, which results in the turn short circuit. The fault performance is large current and working frequency is higher than usual.