JPS629706A - Roll for rolling patterned metallic material - Google Patents

Abstract

PURPOSE:To prevent the cracking near the projecting part of a rolled product and to improve the quality of the patterned metallic material by chamfering or rounding the outside edges of the grooves provided to a roll body part in order to form a pattern on the surface of a material to be rolled. CONSTITUTION:The rolling roll 10 is chamfered at an angle beta in the outside edge part 12 on the front and rear of the groove 11 in the rolling direction. A rolling roll 20 is rounded at a radius R1 of curvature in the outside edge part on the front and rear of the groove 21 in the rolling direction. The restraint of the material flow by the outside edges 12, 22 and sloped inside flanks 13, 23 of the grooves 11, 21 is relieved and the tensile stress generated at the rising start point on the front side (LE side) in the rolling direction of the projecting part on the material surface is decreased according to the rolls 10, 20 having such grooves. The generation of the crack near said parts is thus prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a roll for rolling a patterned metal material, which forms a pattern of unevenness on the surface of a material to be rolled, such as a 1a steel plate or striped channel steel.

[Prior Art] A roll 1 for rolling a patterned metal material is, for example, disclosed in Japanese Patent Publication No. 1983-
As shown in Japanese Patent No. 34022, the roll body is provided with trapezoidal grooves 2 as shown in FIG.

The roll 1, together with an opposing, for example, flat rolling roll, rolls the material to be rolled, making it possible to obtain a product 3 having a convex pattern as shown in FIG.

[Problems to be Solved by the Invention] In rolling with the conventional rolling roll 1 described above, when the rolled material forms a convex pattern within the roll bite, the outer edge portions 4.4' of the grooves 2 and the rolling It is constrained by the inclined inner surface 5.5' on the front side (hereinafter referred to as the LE side). As a result, the LE of the convex portion 6 in the rolled product 3
A crack 8 is formed near the side rise starting point 7,
Further, the cross-sectional shape of the convex portion 6 in the rolled product 3 becomes asymmetrical in the rolling direction. 9 is an inclined side surface on the LE side, and 91 is an inclined side surface on the rear side in the rolling direction (hereinafter referred to as the TE side).

An object of the present invention is to prevent the occurrence of cracks in the vicinity of convex portions of rolled products and to improve the quality of patterned metal materials.

Another object of the present invention is to prevent the occurrence of cracks near the convex portions of rolled products, prevent the cross-sectional shape of the convex portions of the product from becoming asymmetrical, and improve the quality of patterned metal materials. shall be.

[Means for Solving the Problems] A first aspect of the present invention is a roll for rolling a patterned metal material in which the roll body is provided with grooves for forming a pattern on the surface of the material to be rolled. The outer edge is chamfered or rounded.

The second aspect of the present invention is a roll for rolling a patterned metal material, which is provided with a groove on the roll chest for forming a pattern on the surface of the material to be rolled, in which the outer edge and bottom of the groove are chamfered or rounded. It was designed to do so.

A third aspect of the present invention is a roll for rolling a patterned metal material comprising grooves in the roll body for forming a pattern on the surface of the material to be rolled, in which the outer edges of the grooves are chamfered or rounded. The slope of the inner surface of the groove on the rear side in the rolling direction is set to be gentler than the slope of the inner surface of the wire groove on the front side in the rolling direction.

A fourth aspect of the present invention is a roll for rolling a patterned metal material in which the roll body is provided with grooves for forming a pattern on the surface of the material to be rolled, in which the outer edges and bottoms of the grooves are chamfered or rounded. At the same time, the slope of the inner surface of the groove on the rear side in the rolling direction is set to be gentler than the slope of the inner surface of the wire groove on the front side in the rolling direction.

[Operation] According to the first aspect of the present invention, the restriction of material flow by the outer edge and inner surface of the groove is relaxed, and the LE of the convex portion on the material surface is reduced.
It is possible to reduce the tensile stress generated at the starting point of the side rise and prevent the occurrence of cracks in the vicinity of the convex portions of the product.

According to the second aspect of the present invention, the restriction of material flow by the outer edge and inner surface of the groove is relaxed, and the LE of the convex portion on the material surface is reduced.
In addition to reducing the tensile stress that occurs at the starting point of the side rise,
It is possible to reduce the material flow at the LE side of the material convex portion and prevent the occurrence of cracks in the vicinity of the convex portion of the product.

According to the third aspect of the present invention, in addition to the effect according to the first aspect of the present invention, the rolling characteristic in which the slope of the LE side side surface of the material convex part is gentler than the slope of the TE side side surface is reversed to the shape of the inner surface of the groove. This can be offset by the asymmetric setting, and it is possible to prevent the cross-sectional shape of the convex portion of the product from becoming asymmetric.

According to the fourth aspect of the present invention, in addition to the effect according to the second aspect of the present invention, the rolling characteristic in which the slope of the LE side surface of the material convex portion is gentler than the slope of the TE side surface is reversed to the shape of the inner surface of the groove. This can be offset by the asymmetric setting, and it is possible to prevent the cross-sectional shape of the convex portion of the product from becoming asymmetric.

[Example] First, the results of an experiment conducted to elucidate the rolling mechanism of a roll for rolling a patterned metal material will be described.

That is, the present inventors used a small rolling mill in which a roll with grooves for striped patterns was used as an upper roll, and a flat roll having the same diameter as the upper roll was used as a lower roll. A rolling experiment was conducted to reproduce the rolling mechanism of a wire plate. The experimental conditions are shown in Table 1, and the cross-sectional shape of the groove in Ronil used in the experiment is shown in FIG.

Table 1 In the above experiment, when observing the longitudinal cross-sectional metal flow of the material after rolling, a very large tensile stress was generated in the vicinity of the starting point 7 on the LE side of the striped convex portion on the material surface, and the crack 8 was , it was recognized that this was caused by this tensile stress.

In addition, in the above experiment, when observing the formation of the striped pattern protrusions within the roll/sheet, the striped pattern protrusions were as follows.

■ It is formed by material flowing from behind and from both width directions; ■ It is restrained by the LE side inner surface 5 and outer edge 4 of the groove; ■ Near the exit of the roll bite, the material surface is larger than the roll surface. As the material advances, the LE side side surface 9 of the convex portion formed in the material is slid up by the inner surface 5 and outer edge 4 of the roll groove 2 near the exit of the roll bite, and due to these reasons, the product 3 It was observed that the cross-sectional shape of the convex portion 6 was asymmetrical in the rolling direction.

Examples of the present invention will be described in detail below.

Here, FIG. 12 shows definitions of various quantities in the groove shape of the roll according to the present invention. In FIG. 12, a is the groove bottom width, h is the groove depth, and α is the inner surface inclination angle. Table 2 shows typical values of the above quantities in conventional grooves.

Table 2 Further, the state of occurrence of the cracks occurring in the product is shown in FIGS. 13(A) and 13(B). FIG. 13(A) shows the position where a normal crack 8 occurs. Figure 13 (B) shows that when the rolling temperature is low and when rolling difficult-to-process materials such as stainless steel,
The position where crack 8 occurs is shown.

Therefore, FIG. 1(A) is a schematic diagram showing the groove shape of the rolling roll according to the first embodiment of the present invention, and FIG. 1(B) is a schematic diagram showing the groove shape of the rolling roll according to the second embodiment of the present invention. FIG. 3 is a schematic diagram showing a groove shape.

The rolling roll 10 shown in FIG. 1(A) has the outer edges 12 of the grooves 11 on the front and back in the rolling direction chamfered at an angle β. This is an example in which .

According to the above-mentioned rolling roll 1O120, the restriction of the material flow by the outer edge 12.22 and the inclined inner surface 13.23 of the groove 11.21 is relaxed, and the tensile stress generated at the starting point of the LE side rise of the convex part on the material surface. is small, and Fig. 13 (A
), it is possible to prevent the rack 8 from occurring.

Table 3 shows the grooves 11.21 in the above rolling roll 10.20.
It shows the various quantities of the preferred shape.

Table 3 FIG. 2(A) is a schematic diagram showing the groove shape of the rolling roll according to the third embodiment of the present invention, and FIG. 2(B) is a schematic diagram showing the groove shape of the rolling roll according to the fourth embodiment of the present invention. FIG. 3 is a schematic diagram showing a groove shape.

The rolling roll 30 shown in FIG. 2(A) has chamfers of an angle β on the outer edges 32 of the grooves 31 in the rolling direction, and chamfers of an angle γ on both sides of the bottoms 33 of the grooves 31 in the rolling direction. This is an example. Further, the rolling roll 40 shown in FIG. 2(B) has rounded outer edges 42 of the grooves 41 in the rolling direction with a radius of curvature R1, and a bottom portion 4 of the grooves 41.
This is an example in which both sides in the rolling direction of No. 3 are rounded with a radius of curvature R2.

According to the above-mentioned rolling roll 30.40, the restriction of the material flow by the outer edge 32.42 and the inclined inner surface 34.44 of the groove 31.41 is relaxed, and the material flow occurs at the start point of the rise on the LE side of the convex part on the material surface. In addition to reducing the tensile stress, the material flow on the LE side of the material convex portion is relaxed, and as shown in Fig. 13 (
It is possible to prevent the rack 8 from occurring as shown in B).

Table 4 shows the grooves 31.4 in the rolling roll 30.40.
1 shows various quantities of the preferred shape.

Table 4 FIG. 3(A) is a schematic diagram showing the groove shape of the rolling roll according to the fifth embodiment of the present invention, and FIG. 3(B) is a schematic diagram showing the groove shape of the rolling roll according to the sixth embodiment of the present invention. FIG. 3 is a schematic diagram showing a groove shape.

The rolling roll 50 shown in FIG. 3(A) has chamfers at angles β and β' on the outer edges 52 and 52' of the groove 51 in the rolling direction, and also has an inclined inner surface 53' on the TE side of the groove 51.
This is an example in which the slope is set to be gentler than the slope of the oblique inner surface 53 on the LE side. Further, the rolling roll 60 shown in FIG.
2' is rounded with curvature radii R1 and R1', and the slope of the TE side inclined inner surface 63' of the groove 61 is adjusted to its LE.
This is an example in which the slope is set to be gentler than the slope of the side oblique inner surface 63.

In addition, in the said rolling roll 50.60, the groove|channel 51.
The chamfering or rounding size βr, H1r given to the TE side outer edge portions 52', 62' of 61 is the chamfering or rounding size βr given to the LE side outer edge portion 52.62 of the line groove 51.61. , is larger than R1.

According to the above-mentioned rolling roll 50.60, the restriction of material flow by the outer edge 52.62 and the inner surface 53.63 of the groove 51.61 is relaxed, and the tensile stress generated at the starting point of the LE side rise of the convex portion on the material surface. 13(A), it is possible to prevent the rack 8 from occurring as shown in FIG. 13(A). In addition, the rolling characteristic in which the slope of the LE side side surface of the material convex part is gentler than the slope of the TE side side surface is offset by the reverse asymmetric setting of the inner surface shape of the groove 51, 61 and the chamfered or rounded shape of the outer edge. , it is possible to prevent the cross-sectional shape of the convex portion of the product from becoming asymmetrical.

Table 5 shows the grooves 51.6 in the rolling roll 50.60.
1 shows various quantities of the preferred shape.

Table 5 FIG. 4(A) is a schematic diagram of the groove shape of a rolling roll according to a seventh embodiment of the present invention. FIG. 4(B) is a schematic diagram showing the groove shape of a rolling roll according to an eighth embodiment of the present invention.

The rolling roll 70 shown in FIG. 4(A') has chamfers at angles β and β' on the outer edges 72 and 72' of the groove 71 in the rolling direction, and on both sides of the bottom 73 of the groove 71 in the rolling direction. angle γ
This is an example in which the groove 71 is chamfered, and the slope of the TE side inclined inner surface 74' of the groove 71 is made gentler than the slope of the LE side inclined inner surface 74. Further, the rolling roll 80 shown in FIG.
2.82' is rounded with a radius of curvature R1, R1', and both sides of the bottom 83 of the groove 81 in the rolling direction are rounded with a radius of curvature R2.
This is an example in which the slope of ' is set to be gentler than the slope of the oblique inner surface 84 on the LE side.

In addition, in the said rolling roll 70.80, the groove|channel 71.
The size of the chamfer or roundness β'R1' given to the outer edges 72', 82' on the TE side of 81 is the same as the size of the chamfer or roundness given to the outer edge 72.82 on the LE side of the line groove 71.81. β is larger than R1.

According to the above-mentioned rolling roll 70.80, the restriction of the material flow by the outer edge 72.82 and the inclined inner surface 74.84 of the groove 71.81 is relaxed, and the material flow is reduced at the LE side rising start line of the convex portion on the material surface. In addition to reducing the tensile stress, the flow of material toward the LE side of the material convex portion is relaxed, and as shown in Fig. 13 (
It is possible to prevent the rack 8 from occurring as shown in B). Also, the slope of the LE side side surface of the material convex part is TE
The groove 71. has a rolling characteristic that is gentler than the slope of the side surface.
The inner surface shape of 81 and the chamfered or rounded outer edge are offset by the symmetric setting of the valve opening, making it possible to prevent the cross-sectional shape of the convex portion of the product from becoming asymmetrical.

Table 6 shows the grooves 71.8 in the rolling roll 70.80.
FIG. 5 is a diagram showing the permissible setting range of the chamfer angle β set at the outer edge of the groove in the rolling rolls 10, 30, 5o, and 70. In addition, Fig. 6 (A) ti, the above rolling row JL/2
FIG. 4 is a diagram showing allowable setting ranges of the rounding radius R1 set at the outer edge of the groove at 0.0, 40.6o, and 80o. Moreover, FIG. 6(B) is a diagram showing the permissible setting range of the rounding radius R2 set at the bottom of the rolling roll 40.80. According to these figures 5 and 6 (A) and (B),
It is recognized that as β, R1, and R2 increase, the number of cracks that occur decreases, and that no cracks occur when β, R1, and R2 are above a certain value. however,
If β, R1, and R2 are too large, a striped pattern with a sufficient anti-slip function cannot be formed, resulting in a defective shape range.

In addition, in implementing the present invention, the above-mentioned first to eighth embodiments
In addition to locally chamfering and rounding the trapezoidal groove as in the examples, by making the shape of the groove bottom and outer edge part of a circular arc or a multidimensional curve (parabola, ellipse, hyperbola, etc.), It becomes possible to further relieve the restriction of material flow due to the groove shape. The groove 91 of the rolling roll 9o shown in FIG. 7(A) has a shape that is a combination of three circular arcs 92A, 92B, and 92C and a straight line. The grooves 101 of the rolling roll 100 shown in FIG.
It has a shape that is a combination of L46 bit ^^ insect - ^^ sail ---- lines. These rolling rolls 90,10
0, it is possible to more reliably prevent the occurrence of the crack 8 shown in FIG. 13 CB). Below, specific experimental results of the present invention and the conventional method will be explained. In this experiment, a rolling roll with grooves for striped pattern was incorporated as the upper roll of the 5th stand of hot finish rolling material, 5US304 material, plate thickness 4 m, plate width 1025 mm.
This is a rolled striped steel plate with a height of 1.7 mm at the center of the striped protrusions.

In this experiment, the groove cross-section (center part) shape of the rolling roll used as the conventional method is as shown in Table 7.
In this case, the entire surface of the rolled striped steel plate became asymmetrical after cracking in the LE (IIIJ) of the striped convex portion, resulting in a defective shape.

On the other hand, FIG. 4(A) used as a specific embodiment of the present invention
, (B), and the shape of the groove cross section (center portion) of the rolling rolls shown in FIGS. 8(A) and (B) are as shown in Table 8.

In the case of these specific examples ■ to ■, racks do not occur unlike in the conventional method, and it is possible to obtain a striped steel plate in which the cross-sectional shape of the striped convex portions is almost symmetrical in the front and back of the rolling direction. there were. In addition, the thickness of striped steel plates that can be rolled has been expanded to less than 3 mm.

It has been confirmed that the present invention is useful not only for rolling patterned metal plates such as striped steel plates, but also for rolling patterned steel sections as shown in FIG.

[Effects of the Invention] As described above, according to the first and second aspects of the present invention, it is possible to prevent the occurrence of cracks near the convex portions of a rolled product and improve the quality of the patterned metal material. becomes possible.

Further, according to the third and fourth aspects of the present invention, generation of cracks near the convex portions of the rolled product is prevented, and
It is possible to prevent the cross-sectional shape of the convex portion from becoming asymmetrical and improve the quality of the patterned metal material.

[Brief explanation of drawings]

FIG. 1(A) is a schematic diagram showing the first embodiment of the present invention.
Figure (B) is a schematic diagram showing the second embodiment of the present invention;
A) is a schematic diagram showing the third embodiment of the present invention, FIG. 2(B)
is a schematic diagram showing the fourth embodiment of the present invention, FIG. 3(A) is a schematic diagram showing the fifth embodiment of the present invention, and FIG. 3(B) is a schematic diagram showing the sixth embodiment of the present invention. , FIG. 4(A) Seventh aspect of the present invention
FIG. 4(B) is a schematic diagram showing the eighth embodiment of the present invention; FIG. 5 is a diagram showing the permissible setting range of the chamfer angle set at the outer edge of the groove in the present invention; Figure 6 (
A) is a diagram showing the permissible setting range of the rounding radius set at the outer edge of the groove in the present invention, FIG. 6(B) is a diagram showing the permissible setting range of the rounding radius set at the groove bottom in the present invention,
FIGS. 7(A) and (B) are schematic diagrams each showing a ninth embodiment of the present invention, and FIGS. 8(A) and (B) each show a groove shape used in a specific embodiment of the present invention. A schematic diagram, FIG. 9 is a schematic diagram showing a conventional grooved rolling roll, FIG. 10 is a side view showing the shape of a product rolled by a conventional grooved rolling roll, and FIG. FIG. 12 is a schematic diagram showing various quantities of the groove shape, FIGS. 13 (A) and (B) are schematic diagrams showing the state of crack generation, and FIG. 14 is a schematic diagram showing the groove shape. FIG. 10.20.30.40,50.60.70.80.9
0, ioo...rolling roll, 11.21.31.41
．． 51.61.71.81.91.101...Groove, 12.22.32.42.52.52', 62.62'
, 72.72', 82.82'...outer edge, 13.2
3.34.44.53.53', 63.63', 74.
74', 84.84'...inner surface, 33.43.73
．． 83...bottom. Agent Patent Attorney Shuji Shiokawa Figure 1 (A) CB) Figure 2 (A) (B) Figure 3 <A> (B) Figure 4 (A) (B) '$ 7 Figure 8 (A) CB) No. 9
Figure 1o Figure 11

Claims (6)

[Claims] (1) A roll for rolling a patterned metal material comprising grooves in the roll body for forming a pattern on the surface of the material to be rolled, characterized in that the outer edge of the groove is chamfered or rounded. A roll for rolling metal materials with a pattern. (2) In a roll for rolling a patterned metal material in which the roll body is equipped with grooves for forming a pattern on the surface of the material to be rolled, chamfering or rounding may be applied to the outer edge and bottom of the groove. Features a patterned roll for rolling metal materials. (3) In a roll for rolling a patterned metal material in which the roll body is equipped with grooves for forming a pattern on the surface of the material to be rolled, the outer edges of the grooves are chamfered or rounded, and the grooves are chamfered or rounded. 1. A roll for rolling a patterned metal material, characterized in that the slope of the inner surface on the rear side in the rolling direction is set to be gentler than the slope of the inner surface on the front side in the rolling direction of the groove. (4) A claim in which the size of the chamfer or roundness provided on the outer edge of the groove on the rear side in the rolling direction is larger than the size of the chamfer or roundness provided on the outer edge of the groove on the front side in the rolling direction. The roll for rolling a patterned metal material according to item 3. (5) In a roll for rolling a patterned metal material in which the roll body is equipped with grooves for forming a pattern on the surface of the material to be rolled, the outer edges and bottoms of the grooves are chamfered or rounded, A roll for rolling a patterned metal material, characterized in that the slope of the inner surface of the groove on the rear side in the rolling direction is set to be gentler than the slope of the inner surface of the groove on the front side in the rolling direction. (6) A claim in which the size of the chamfer or roundness provided on the outer edge of the groove on the rear side in the rolling direction is larger than the size of the chamfer or roundness provided on the outer edge of the groove on the front side in the rolling direction. 6. The patterned roll for rolling metal material according to item 5.