Profiles include hot rolled profiles, cold rolled profiles, cold drawn profiles, extruded profiles, forged profiles, hot bent profiles, welded profiles and special rolled profiles.
1. Profile extrusion is the process of producing profiles by extrusion. The hollow profile is extruded by piercing and welding; Solid profile adopts forward extrusion, reverse extrusion and combined extrusion.
2. Cold drawing of profiles is a method of drawing hot-rolled profiles with machining allowance at room temperature to produce high-precision and high-quality profiles. This method can improve the strength, dimensional accuracy and straightness of profiles, reduce the surface roughness, and achieve the purposes of improving the utilization rate of profiles and saving energy and materials. The cold drawing method can be used to produce a large number of products economically and effectively without mechanical processing.
3. Cold-formed profile is a profile formed by plastic bending and deformation of metal plate and strip at constant temperature.
Extended data
Profile production has the following characteristics:
1, many varieties and specifications. There are more than 10 thousand kinds, and in production, except for a few special rolling mills that produce special products, most profile rolling mills are producing a variety of specifications.
2. The cross-sectional shapes are quite different. In profile products, except square steel, round steel and flat steel, most profiles with complex sections (such as I-beam, H-beam, Z-beam, channel steel, rail, etc. ) Not only the cross-sectional shapes are complex, but also they are quite different from each other. Pass design and rolling production of these products have their own particularity.
The complexity of cross-section shape makes the deformation of metal parts, the temperature distribution of cross-section and the wear of roll uneven during rolling, so it is difficult to accurately calculate and control the size of rolled piece, and the adjustment of rolling mill and the installation of guide device are also very complicated. In addition, a single variety or specification of complex cross-section profiles is usually small in batch. The above factors make it difficult to develop the continuous rolling technology of complex section profiles.
3. There are many kinds of rolling mill structures and arrangements. Structural forms include two-high mill, three-high mill, four-high universal pass mill, multi-high pass mill, Y-type mill, 45 mill and cantilever mill. In the layout of rolling mills, there are horizontal rolling mills, in-line rolling mills, checkerboard rolling mills, semi-continuous rolling mills and continuous rolling mills.
References:
Baidu Encyclopedia-Introduction