JP2000271841A - Grinding device for steel belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a scratch and an indented scar from formed on the surface of a steel belt by arranging grinding belts supporting the bottom of the steel belt and a mechanism rotating the grinding belts. SOLUTION: A steel belt wound into a coil is delivered by rewound by a payoff reel 11 and fed to grinding belts 5 via an on-coming side pinch roll 2 applying a tensile force to the steel belt 1 and an on-coming side leveler 3 flattening the steel belt surface. The grinding belts 5 are arranged in the upper surface side and the lower surface side of the steel belt 1. A plurality of grinding belts 5 are arranged in series separated by an appropriate distance in the traveling direction of the steel belt 1 and the steel belt 1 is sequentially passed through to be ground thereby. The steel belt 1 passing through the last grinding belt 5 is rewound into a coil by a tension reel 12 via a off-going side wiper 7 delivering the grinding chips, an off-going side shear 8 cutting the steel belt 1 at an appropriate length, the off-going side leveler 9, and an off- going side pinch roll 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel strip grinding apparatus, and more particularly, to an improvement of an existing belt type grinding apparatus.

[0002]

2. Description of the Related Art When a steel sheet such as stainless steel is manufactured, an oxide scale and surface flaws are generated on the surface of a steel strip in a hot rolling process. Therefore, a step of removing these and removing the surface is required. As a removing method, so-called “shot blast” in which a large number of steel balls (called “shots”) are blown onto the steel strip surface at a high speed, or “belt grinding” in which a belt having abrasive grains adhered thereto is polished by contacting the steel strip surface. It was typical.

In this belt grinding, as shown in FIG. 2, a roll (hereinafter, referred to as a billy roll 13) for supporting a lower surface of a running steel strip 1, and a part of the grinding belt 5 on an upper surface, respectively. The steel strip 1 is arranged and rotated in a state of being in contact with the steel strip 1 to continuously grind the upper surface of the steel strip 1 so that only one surface of the steel strip 1 is finished.

[0004]

However, in the method of finishing one side of the steel strip 1 first and then finishing the other side, the steel strip 1 must be passed through the belt grinding line twice, Before finishing the steel strip, one extra process with extremely poor workability, such as turning over the upper and lower surfaces, was added, which hindered the productivity of the steel strip 1. Also, in order to finish one side at a time, when grinding the subsequent surface, the surface with the smaller roughness by grinding first,
The vehicle travels in contact with the billy roll 13.
Smaller roughness means smaller coefficient of friction,
Due to slippage caused by a slight difference between the running speed of the steel strip 1 and the peripheral speed of the billy roll, there has been a problem that scratches and indentation flaws are generated on the previously ground surface.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a steel strip grinding apparatus which does not generate scratches or indentation flaws on the surface of the steel strip and has good workability and productivity.

[0006]

Means for Solving the Problems The inventor has conducted intensive studies to achieve the above object and has embodied the results in the present invention.

That is, the present invention provides a roll for supporting a lower surface of a horizontally running steel strip while rotating the same, a grinding belt for bringing a surface having abrasive grains adhered to the upper surface of the steel strip, and a grinding belt for the grinding belt. And a mechanism for rotating, in a steel strip grinding apparatus arranged in series along a running line of the steel strip, in place of a roll supporting the lower surface, a grinding belt and a mechanism for rotating the grinding belt. This is a steel strip grinding apparatus characterized by being arranged. Here, as a mechanism for rotating the grinding belt, two sets of pulleys are exemplified.

In the present invention, it is preferable that the grinding belt that replaces the billy roll has the same specification as the grinding belt that contacts the upper surface.

In the present invention, since the grinding belts having the same specifications are arranged not only on the upper surface side but also on the lower surface side of the steel strip, the upper and lower surfaces of the steel strip can be ground at the same time. As a result, the workability and productivity of grinding are better than before,
The problem of slippage between the lower surface and the billy roll during grinding is also eliminated, so that the surface of the steel strip is free from scratches and pushes.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

First, a steel strip grinding apparatus according to the present invention is shown in FIG.
Shown in The coiled steel strip 1 is rewound and paid out by a pay-off reel 11, passed through an input pinch roll 2 for applying tension to the steel strip 1, and an input side leveler 3 for flattening the steel strip surface, and then ground. It is supplied to the belt 5. This grinding belt 5
Conventionally, the grinding belt 5 is arranged on only the upper surface side of the steel strip 1 and is supported by the billy roll 13 on the lower surface side. However, in the present invention, the grinding belt 5 is also arranged on the lower surface side.
A plurality of the grinding belts 5 are arranged in series at an appropriate distance from each other in the running direction of the steel strip 1 so that the steel strips 1 pass sequentially. And the final grinding belt 5
The steel strip 1 having passed through the tension reel 1 passes through an output wiper 7 for removing grinding debris, an output shear 8 for cutting the steel strip 1 to an appropriate length, an output leveler 9 and an output pinch roll 10.
In step 2, it is wound up again in a coil shape. The widths of the grinding belt 5 and the grinding belt rotating mechanism 14 are, of course,
It is wider than the width of the steel strip 1.

According to the steel strip grinding apparatus of the present invention, since the grinding belt 5 comes into contact with the upper and lower surfaces of the steel strip 1 at the same time, the upper and lower surfaces can be ground simultaneously.
In the present invention, the grinding belts facing each other up and down are
It is preferable that the type and the number of revolutions of the abrasive grains to be adhered are the same. The friction resistance between the upper and lower surfaces and the grinding belt becomes equal,
This is because the action of the force to warp the steel strip 1 in the vertical direction can be canceled, and troubles in passing the sheet (such as waving and jumping) can be avoided. Further, the grinding device according to the present invention can also grind only one surface by removing the grinding belt 5 on the lower surface side and supporting the lower surface of the steel strip 1 with the grinding belt rotating mechanism 14.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Using a grinding device according to the present invention shown in FIG.
The surface of the stainless steel strip of SUS304 was ground. FIG.
In the conventional grinding apparatus shown in FIG. 1, a steel strip 1 of the same steel type was ground under the same conditions (running speed, roughness of grinding belt, peripheral speed).

The grinding performance is shown in Table 1 for comparison. From Table 1, it is clear that the time required to grind one steel strip coil has been significantly reduced by the present invention. In addition, it can be seen that the occurrence of the flaws and the pressing flaws generated on the surface of the steel strip 1 is remarkably reduced as compared with the related art.

[0015]

[Table 1]

[0016]

As described above, according to the present invention, in the surface grinding of a steel strip, not only the workability and productivity have been greatly improved, but also troubles in the surface quality of a product can be solved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view schematically showing a steel strip grinding apparatus according to the present invention.

FIG. 2 is a longitudinal sectional view schematically showing a conventional grinding apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel strip (steel plate) 2 Inlet pinch roll 3 Inlet leveler 4 Inlet wiper 5 Grinding belt 6 Grinding stand 7 Outlet wiper 8 Outlet shear 9 Outlet leveler 10 Outlet pinch roll 11 Inlet payoff reel 12 Outlet side Tension reel 13 Billy roll 14 Grinding belt rotation mechanism

Claims (2)

[Claims] 1. A roll for supporting a lower surface of a horizontally running steel strip, a grinding belt for bringing a surface having abrasive grains attached to the upper surface of the steel strip into contact, and a mechanism for supporting and rotating the grinding belt. And a plurality of steel strip grinding devices arranged in series along a running line of the steel strip, characterized in that a grinding belt and a mechanism for rotating the grinding belt are arranged instead of the roll supporting the lower surface. Grinding equipment for steel strip. 2. The steel strip grinding apparatus according to claim 1, wherein a grinding belt replacing the roll supporting the lower surface has the same specification as a grinding belt contacting the upper surface.