During the rolling process of the heat-retaining water tank plate, due to various reasons (such as stress bending of the roller, uneven temperature distribution along the length direction of the roller body, etc.), the roller type (roll gap) will also change, resulting in changes in the horizontal thickness difference of the plate. , Or the wave appears due to uneven deformation of the plate around the roll roll.
The deviation of the thickness of the strip material in the width direction (that is, the difference between the thickness of the strip's middle portion and the edge portion) is called the lateral thickness difference (or the same or three difference). It determines the shape of the cross-section of the sheet (Figure 1)
The horizontal thickness difference of the rectangular section is zero, which is an ideal case. The lateral thickness difference of the wedge-shaped section is caused by improper adjustment of the left and right pressing devices. The transverse thickness difference of the symmetrical convex or concave section is caused by the actual roll gap shape during rolling, which is determined by the design and adjustment of the roll shape and the blank and other factors. In the product standard, provisions have been made for horizontal thickness difference.
Reducing the lateral thickness difference of strips and strips firstly helps ensure the uniformity of the thickness of the products, and also increases the finished product yield, especially when the strips are delivered according to the strip length, which can bring certain economic benefits.
The shape of the heat tank is the abbreviation of the flatness of the strip. The quality of the plate shape refers to whether the plates or strips in each of the horizontal sections generate waves or wrinkles. It depends on whether the strip strips extend in the width direction. As shown in FIG. 2 , if the roll gap during rolling is poor, and the extension of both sides is greater than the middle, a symmetrical bilateral wave is generated; conversely, if the middle extension is greater than the extension of the edge, an intermediate wave (shovel) is generated. If the pressure on both sides is not adequate, one side of the extension is greater than the other side, then a unilateral wave or swarf is generated.
Common form defects include guillotine bends, waves, and scoops. There are several forms of wave-shaped and scouring defects (Fig. 3), in which "eyes" belong to special wave-shaped defects; the more common ones are central waves and unilateral or bilateral waves. For all strip steel products, no obvious wave shape and squish are allowed, and there are specific regulations in the product technical standards.
The criterion for measuring the quality of a board is the degree of flatness (flatness). Figure 4 shows a longitudinal section of the strip in a waved position. The general plate strip's degree of wave can be expressed as:
From the above, it can be seen that the shape of the plate is determined by the difference in the longitudinal extension of the strip. Therefore, the lateral thickness difference and the plate shape are two different concepts, but the lateral thickness difference and the plate shape are also intrinsically related. By adjusting the shape of the roll gap, it is possible to achieve the purpose of reducing the transverse thickness difference of the strip and improving the quality of the strip shape (that is, eliminating edge waves and intermediate waves).
The deviation of the thickness of the strip material in the width direction (that is, the difference between the thickness of the strip's middle portion and the edge portion) is called the lateral thickness difference (or the same or three difference). It determines the shape of the cross-section of the sheet (Figure 1)
The horizontal thickness difference of the rectangular section is zero, which is an ideal case. The lateral thickness difference of the wedge-shaped section is caused by improper adjustment of the left and right pressing devices. The transverse thickness difference of the symmetrical convex or concave section is caused by the actual roll gap shape during rolling, which is determined by the design and adjustment of the roll shape and the blank and other factors. In the product standard, provisions have been made for horizontal thickness difference.
Reducing the lateral thickness difference of strips and strips firstly helps ensure the uniformity of the thickness of the products, and also increases the finished product yield, especially when the strips are delivered according to the strip length, which can bring certain economic benefits.
The shape of the heat tank is the abbreviation of the flatness of the strip. The quality of the plate shape refers to whether the plates or strips in each of the horizontal sections generate waves or wrinkles. It depends on whether the strip strips extend in the width direction. As shown in FIG. 2 , if the roll gap during rolling is poor, and the extension of both sides is greater than the middle, a symmetrical bilateral wave is generated; conversely, if the middle extension is greater than the extension of the edge, an intermediate wave (shovel) is generated. If the pressure on both sides is not adequate, one side of the extension is greater than the other side, then a unilateral wave or swarf is generated.
Common form defects include guillotine bends, waves, and scoops. There are several forms of wave-shaped and scouring defects (Fig. 3), in which "eyes" belong to special wave-shaped defects; the more common ones are central waves and unilateral or bilateral waves. For all strip steel products, no obvious wave shape and squish are allowed, and there are specific regulations in the product technical standards.
The criterion for measuring the quality of a board is the degree of flatness (flatness). Figure 4 shows a longitudinal section of the strip in a waved position. The general plate strip's degree of wave can be expressed as:
From the above, it can be seen that the shape of the plate is determined by the difference in the longitudinal extension of the strip. Therefore, the lateral thickness difference and the plate shape are two different concepts, but the lateral thickness difference and the plate shape are also intrinsically related. By adjusting the shape of the roll gap, it is possible to achieve the purpose of reducing the transverse thickness difference of the strip and improving the quality of the strip shape (that is, eliminating edge waves and intermediate waves).
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