What are the Benefits of Flat Roll Rolling 15crmo Alloy Steel Plates?

　　The rolling process is a process in which the rolling piece is subjected to plastic deformation by compression when the roll is moved by the rolling (metal). If the roll body is a uniform cylinder, such a roll is called a flat roll, and the 15CrMo alloy steel plate is rolled by a flat roll, which is called flat roll rolling.

　　Flat roll rolling is the most important pressure processing method for producing plates, strips and foils. Figure 3-1 shows the force of the rolling stock during rolling. It can be seen from the figure that the rolling is dragged between the rolls by the frictional force (T) of the rotating rolls, and the rolling force is applied to the rolls by the pressure applied by the rolls. A method of material processing in which compression deformation occurs. After the rolling stock is rolled, not only the thickness of the rolled product is thinned, but also the structure and properties of the rolled product are improved and improved.

　　If the 12Cr1MoV alloy steel plate is hot rolled, the coarse crystals of the ingot can be broken and the structure is densified; the cold rolling can make the metal grain breakage become finer, the strength of the 15CrMo alloy plate is improved, the simple rolling process and the rolling deformation parameters are shown in Fig. 3 -1 The plasticity of the rolled part during rolling is reduced, and the simple rolling process is often simplified to an ideal simple rolling process for the convenience of research. The simple rolling process shall have the following conditions: the two rolls are the main drive rolls, the roll diameter is the same, the rotation speed is equal, and the roll is a rigid rolled piece except for the action of the roll, and is not affected by any external force (tension or thrust when the rolled piece is high) When compressed by the rolls, the metal will flow in the longitudinal and transverse directions, that is, the high-direction (thickness) of the rolled product is compressed, and the length and width of the rolled 15CrMo alloy steel plates are increased.

　　However, the longitudinal extension deformation always exceeds the lateral expansion amount (widening), because the friction of the roller surface is always more obstructive to the wide flow than the longitudinal direction, that is, the lateral width is always relative to the longitudinal deformation. smaller. In the rolling deformation process, high-direction compression is the dominant deformation and is the basis for studying the rolling problem. The index indicating the degree of deformation is usually referred to as the deformation index.

　　The deformation index commonly used in the rolling of 15CrMo alloy sheet is shown in the area where the rolling deformation of the rolled piece between the rolls is called the rolling deformation zone. It is the contact arc AB, A'B' between the rolling stock and the roll, and rolling. The vertical section of the person's roll. The area enclosed by the vertical section BB' of the AA' and the exit roller is called the geometric deformation zone, or the ideal deformation zone (see in fact, the 15CrMo alloy plate becomes the human roll and the exit section of the Hebei steel recombination in the geometric deformation zone. In the nearby area, there are more or less plastic deformations of the rolled parts, which are called front and back non-contact deformation zones.

　　In addition, when the hot-rolled parts are hot-rolled, the deformation is not easily penetrated, so that some of the metal is hardly plastically deformed in the geometrically deformed region, forming a so-called hard-to-deformation zone. The basic parameters describing the rolling geometric deformation zone are: contact angle a, deformation zone length I (horizontal projection of the contact arc), average thickness of the rolled piece, two (H +.h)/2 and deformation zone shape factor, and B /h},), H, h are the thickness before and after rolling of the rolled piece, and B is the width of the rolled piece.

　　The geometric deformation zone of a rolling is gradually reduced, and the process of rolling the 1Cr5Mo alloy steel plate is easier than that of starting the bite. The rolling conditions are easier to achieve than the biting conditions. When other conditions (lubrication condition, pressure) When the amount is constant, the rolled piece can be naturally filled between the rolls until a stable rolling process is established.

　　Measures to improve the difficulty of biting into the piece According to Equations 3-12 and 3-10, the main measures to improve the difficulty of rolling biting are: When Δh is constant, the larger the diameter D of the roll, the smaller the bite angle is, the easier it is. Biting people. When the roll diameter D is constant, the larger the reduction amount Ah, the more difficult it is to bite. Therefore, in order to improve the biting difficulty in the production of 15CrMo alloy steel sheets, the front end of the rolled product is often formed into a wedge shape or a circular arc shape.

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