JPS6339760A - Method and device for grinding edge of metal plate - Google Patents

Abstract

PURPOSE:To obtain a plane-shaped edge part preventing the edge part of a metal plate from being accompanied with a burr, by forming a sectional contour shape of the edge part to a convex shape in the first grinding process and to a plane shape thereafter in the second grinding process. CONSTITUTION:A metal plate 11, conveyed through paired retaining rollers 23, forms an edge part 12 to be ground by a rotary grinding wheel 13, tilted in a predetermined angle, in the first grinding machine 21, and a convex edge part 12A is obtained. Next the convex edge part 12A, which is ground in the second grinding machine 22 by a grinding wheel 14 rotated in such a manner as to cross at a right angle with the conveying direction of the metal plate 11, is formed into a plane-shaped edge part 12B. The metal plate 11, if it is ground as in the above, generates no burr in the edge part, and the plane-shaped edge part 12B can be obtained by cutting the edge part 12 to be removed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for edge grinding a metal plate such as a hot rolled steel strip.

[Prior Art] Generally, a hot rolled steel strip has cracks (cracks or scabs) on both edges in the width direction of the tm strip.

When such hot-rolled steel strips are forced under heavy pressure under high tension using a cold-pressing machine such as a Sendzimir mill, cracks at the edges grow significantly and cause the plate to break, leading to mill damage. There is a possibility that

Conventionally, hot rolled steel strips such as those mentioned above are trimmed by 7 to 15 mm on both edges using a side trimming device, and the cracked portions are cut off before being subjected to cold rolling. .

[Problems to be Solved by the Invention] However, when using the side trimming device described in "-", the amount of dimensional reduction due to trimming the width of the raw steel strip is excessive, resulting in a very poor yield.

In addition, as a means for removing both edge portions of the hot rolled steel strip as described above, it is also possible to use a grindstone grinding device as described in Japanese Utility Model Application No. 6O-103Ei55. When using the above whetstone grinding device, 5 m including the cracked part of the edge of both sides (grinding allowance on one side)
It is possible to delete about m, and it is possible to move forward from the end of the road. However, burrs are produced on the edges ground by the above-mentioned grindstone grinding device. This burr occurs when the grinding allowance by the whetstone grinding device exceeds the limit, and because the burr does not extend and deform during cold rolling, it may become a predisposition to create new racks at the edge portion during cold rolling. Yes, it is not valid.

An object of the present invention is to remove the edge portion of a metal plate without creating a burr thereon, thereby obtaining a flat edge portion.

[Means for Solving the Problems] The method for grinding an edge of a metal plate according to the present invention involves grinding the edge using a rotary grindstone disposed obliquely with respect to the longitudinal direction of the edge, thereby reducing the cross-sectional profile of the edge. A first grinding step in which the shape of the edge portion is made into a convex shape, and a second step in which the convex edge portion is ground by a rotary grindstone arranged substantially orthogonally to the longitudinal direction of the edge portion, and a cross-sectional profile of the edge portion is made into a planar shape. This process consists of a grinding process.

The edge grinding device for a metal plate according to the present invention includes a first grinding machine in which a rotary whetstone is disposed diagonally with respect to the longitudinal direction of the edge portion, and a rotary whetstone is disposed subsequent to the first grinding machine, and the rotary whetstone is disposed obliquely with respect to the longitudinal direction of the edge portion. and a second grinding machine arranged substantially perpendicular to the longitudinal direction. After the first grinding machine makes the cross-sectional shape of the edge part into a mid-height shape, the second grinding machine cuts the cross-sectional shape of the mid-height edge part. The surface contour shape is made into a planar shape.

[Function] According to the method and apparatus for edge grinding of a metal plate according to the present invention, in the first grinding step, as shown in FIGS. The edge portion 12 is ground by a rotary grindstone 13 disposed obliquely (angle of inclination Q) with respect to the direction, and the cross-sectional profile shape of the edge portion 12 is made into a medium-height shape (height H). In the process, as shown in FIGS. 4(A) and 4(B), a rotary grindstone 14 is placed approximately orthogonally to the longitudinal direction of the edge portion 12.
The medium-height edge portion 12A is ground by grinding, and the cross-sectional contour shape of the edge portion 12 is made into a planar shape, and a planar edge portion 1 is obtained.
You will get 2B.

Here, according to the rotary grindstone 13 disposed in the longitudinal direction of the edge portion 12, the following grinding teeth have a cross-sectional contour shape of the edge portion 12 having a medium height shape. That is, as shown in FIGS. 5(A) and CB), the rotating grindstone 13
When arranged approximately orthogonally to the longitudinal direction of the edge portion 12,
The grinding surface of the rotary grindstone 13 is planar. On the other hand, as shown in FIGS. 6(A) and 6(B), when the rotary whetstone 13 is aligned in the longitudinal direction of the edge portion 12, the grinding surface of the rotary whetstone 13 becomes slit-shaped. Therefore, Fig. 5 (A
) and FIG. 6(A), if the single-turn whetstone 13 is arranged at an angle with respect to the longitudinal direction of the edge portion 12 as shown in FIG. 7, the grinding surface of the rotary whetstone 13 becomes concave. , it becomes possible to make the cross-sectional contour shape of the edge portion 12 medium-height.

Therefore, in the grinding process No. 11, when the rotary whetstone 13 is arranged at an angle with respect to the longitudinal direction of the edge portion 12 as described above, as shown in FIGS. 7 and 8, the rotary whetstone 13
Since the metal plate 11 is contacted from a portion having a large diameter, no burrs occur on the upper and lower surfaces of the edge portion 12 of the metal plate 11. At this time, the burr is the edge portion 12 of the metal plate 11.
However, this burr is chased rearward in the longitudinal direction of the edge portion 12, and therefore
There are no remaining burrs on A. In addition, in FIG. 8, S is the feeding direction of the metal plate 11, and G is the rotating grindstone 13.
K is the direction of rotation of the chips, and K is the direction of chip flow.

In addition, in the second grinding process, when the rotary whetstone 14 is arranged substantially perpendicular to the longitudinal direction of the edge portion 12, since the rotary whetstone 14 grinds the medium-height edge portion 12A, burrs may be generated. Planar edge portion 12 without
You can get B.

Therefore, according to the present invention, the edge portion of the metal plate can be removed without causing any burrs, and a planar edge portion can be obtained. In addition, if heavy grinding is performed in the first grinding step, and light grinding is performed on the medium-height knee portion after the heavy grinding into a flat shape in the second grinding step, for example, if the hot-rolled steel strip has deep cracks, Edges can also be ground without any burrs.

Note that the convex edge portion obtained by the first grinding step may be not only round as shown in FIG. 3(B) but also linear as shown in FIG. 9.

[Embodiment] FIG. 1 is a side view showing an edge grinding bag according to a first embodiment of the present invention, and FIG. 2 is a view taken along the line II--II in FIG. 1.

In FIG. 1, 21 is a first grinder, 22 is a second grinder, and 23 is a press roller for the metal plate 11 that is continuously passed through.

The first grinder? 3 is equipped with the rotary whetstone 13 shown in FIG.

Further, the second grinding machine 22 is disposed subsequent to the first grinding machine 21 and is equipped with the rotary whetstone 14 shown in FIG. They are arranged almost orthogonally.

The first grinding machine 21 and the second grinding machine 22 basically have the same configuration, and are respectively arranged on the left and right sides of the pass line of the metal plate.

As shown in FIGS. 1 and 2, the second grinding machine 22 has a frame 25 that is slidably supported by a slide guide 24 provided on the floor, and the frame 25 has a drive motor 26 and a rotating A grindstone 14 is provided, and a drive motor 26 and the rotary grindstone 14 are coupled by a belt 28 so as to be interlocked. The frame 25 can move forward and backward along the slide guide 24 with respect to the edge portion 12 of the metal plate 11. A driving member 29 that drives the frame 25 is supported by the slide guide 24 . frame 25
The drive member 29 is engaged via a spring 30 in the forward direction of the frame 25, and directly engaged in the backward direction of the frame 25. Drive member 29
is screwed into a screw shaft 31, and this screw shaft 31 is driven by the rotational force transmitted from the servo motor 32 via the belt 33, moves the frame 25 along the slide guide 24, and in turn moves the rotary grindstone 13 to the metal. It is possible to move forward and backward relative to the edge portion 12 of the plate 11.

The first grinder 21 has basically the same configuration as the second grinder a22 as described above, but the movable base 25B is fixed to the frame 25A supported by the slide guide 24 with the fixing bolt 34, The difference is that this movable table 25B is provided with a drive motor 26 and a rotary grindstone 13. The movable table 25B is removable and its fixed position relative to the frame 25A can be adjusted, thereby making the inclination angle θ of the rotary grindstone 13 adjustable. Note that the same parts in the first grinding machine 21 as in the second grinding machine 22 are given the same reference numerals as in the second grinding machine 22.

The presser roller 23 presses the metal plate 11 on the pass line to prevent the metal plate 11 from waving during grinding.
A scale suction device 35 is installed below the grinding area of the rotary grindstones 13,14.

According to the edge grinding device, as described above, in the first grinding step, the edge portion 12 is ground by the rotary grindstone 13 of the first grinder 21 to obtain the medium-high edge portion 12A. In the second grinding step, the rounded edge portion 12A is ground by the rotary grindstone 14 of the second grinder 22 to obtain a planar edge portion 12B. Therefore, the edge portion 12 of the metal plate 11 can be removed without any burrs, and a planar edge portion 12B can be obtained. As a result, if heavy grinding is performed in the first grinding process and light grinding is performed on the medium-high edge portion 12A after the heavy grinding in the second grinding process, for example, deep cracks in the hot-drilled steel strip can be removed. It is also possible to grind the edge portion with no burr at all.

Note that the inclination angle θ of the rotary grindstone 13 in the first grinding step is adjusted within a range of 2 Or1 to 80 degrees depending on the steel type and plate thickness.

[Effects of the Invention] As described above, according to the method and apparatus for edge grinding of a metal plate according to the present invention, after the cross-sectional profile shape of the edge portion is made into a medium-height shape in the first grinding step, in the second grinding step By making the cross-sectional profile of the above-mentioned mid-height edge portion flat, it is possible to remove the edge portion of the metal plate without creating a burr, thereby obtaining a flat edge portion.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an edge grinding bag according to an embodiment of the present invention, Fig. 2 is a view taken along the line II-II in Fig. 1, and Figs. 3 (A) and (B) are A schematic diagram showing the grinding state in the first grinding process, FIGS. 4(A) and (B) are schematic diagrams showing the grinding state in the second grinding process, and FIGS. 5(A) and (B) show the edge of the metal plate. Schematic diagram showing the state of grinding by a rotary grindstone arranged substantially perpendicular to the longitudinal direction, Figures 6 (A) and (B)
is a schematic diagram showing the state of grinding by a rotary grindstone arranged parallel to the longitudinal direction of the edge of a metal plate, FIG. 7 is a schematic diagram showing the state of grinding of a medium-height edge part, and FIG. 8 is a part of FIG. 7. FIG. 9 is a schematic diagram showing the flow state of chips in FIG. 11... Metal plate, 12... Edge portion, 12A...
Medium-high edge portion, 12B... Planar edge portion, 13.
14... Rotating whetstone. Agent Patent Attorney Osamu Shiokawa Figure 2 Figure 3 Figure 4 (A) (B) Figure 5 (A) (B) 6th (A) (B) Figure 7 Figure 8 Figure 9

Claims (2)

[Claims] (1) In a metal plate edge grinding method in which the edge of a metal plate is ground with a rotating grindstone, the edge is ground with a rotating grindstone disposed obliquely to the longitudinal direction of the edge, and the cross-sectional profile of the edge is A first grinding step in which the shape is made into a convex shape, and a second step in which the convexly shaped edge portion is ground by a rotary grindstone arranged substantially perpendicular to the longitudinal direction of the edge portion, and the cross-sectional contour shape of the edge portion is made into a planar shape. A method for grinding an edge of a metal plate, comprising a grinding step. (2) In a metal plate edge grinding device for grinding an edge portion of a metal plate using a rotary whetstone, a first grinding machine in which the rotary whetstone is arranged diagonally with respect to the longitudinal direction of the edge portion;
The second grinder is disposed subsequent to the first grinder and has a rotary grindstone arranged substantially perpendicular to the longitudinal direction of the edge. After that, a second grinding machine is used to flatten the cross-sectional profile of the medium-height edge portion.