The short stress rolling mill refers to the profile rolling mill with short stress loop of the working machine. The stress loop of the working frame refers to the connection of the neutral line of the elastic deformation section of the stressed parts in the rolling mill after the rolling force is applied to the rolling mill. The length of the stress loop is the sum of the lengths of the stressed parts in the rolling mill. The elastic deformation produced by each stressed part in the rolling stand is directly proportional to its sectional area and inversely proportional to its length. The shorter the stress loop in the stand, the smaller the elastic deformation produced, the greater the stiffness of the rolling mill (see the stiffness coefficient of the rolling mill) and the higher the accuracy of the rolled products.
There are two ways to shorten the stress loop of the rolling mill: one is to change the form of the bearing structure of the rolling mill, that is, to reduce the number of bearing parts in the rolling mill base. For example, for the houseless rolling mill, shorten the stress loop by shortening the length of the stressed parts; The second is to change the transmission path of the force, such as making the rolling force not directly act on the upper part of the archway window, but on the column close to the rolling mill, so as to shorten the stress loop.
The advantages of short stress line rolling mill are:
(1) The high rigidity of the rolling mill ensures the high precision of the product, and it is easy to realize negative deviation rolling.
(2) It can realize symmetrical adjustment. This is of great significance for stabilizing operation, improving operation rate, saving maintenance and replacement time of guide beam, reducing operation accidents, avoiding process accidents such as rolled piece elbow, impact and roll winding, and improving the service life of guide.
(3) Because the rolling mill changes the transmission path of force and changes the concentrated load of the pressed screw into the dispersed load scattered on both sides of the bearing pedestal, the stress condition of the bearing and the bearing pedestal is better, and the service life of the bearing is more than 1.5 times higher than that of the ordinary rolling mill, so as to reduce the cost of the product.
(4) The roll system of this rolling mill shall be pre-installed and adjusted before roll change, and the new roll system can be changed about 10min after shutdown. The adjusted new roll system can ensure that the products are qualified after rolling one or two pieces of steel. Therefore, the mill has good preset performance, fast roll change and high yield.
Short stress line rolling mill, also known as no archway rolling mill, is a kind of high stiffness rolling mill. When used as section steel rolling mill, it should not only have high radial stiffness, but also have high axial stiffness. At present, various types of short stress line mills have been developed in China, such as GY type, HB type, CW type, SY type, GW type and DW type. Among them, there are three representative types: Gy type short stress line mill, Hb type non-archway mill and Sy type high stiffness mill. These rolling mills are self-developed with reference to the P-60 Memorial archless rolling mill in Sweden and in combination with their different conditions. Therefore, the high-stress line structure of their main stress parts is similar, but there are some differences in support mode and some specific structures, and each has its own characteristics.
If you are interested in the short stress rolling mill, please mail at marketing2@hanrm.com.
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