JPH0699338A - Band steel edge shape forming equipment and forming method for shape thereof - Google Patents

Abstract

PURPOSE:To obtain the good abut part of a welded steel pipe by providing a pair of horizontally and vertically tiltable rotary type brush rolls on pedestals provided under band steel at its both the sides. CONSTITUTION:Pedestals 9 are provided under band steel 12 at its both tire sides to serve as devices for removing fins and burrs on the edge parts of the band steel 12 for producing a welded steel pipe. A pair of horizontally and vertically tiltable rotary type brush rolls 1 are provided on the pedestals 9. In this case, the brush rolls 1 are vertically declined by theta1 with the band belt 12 input side upward. The band belt 12 input side is horizontally declined to the band belt 12 side by theta2. The band steel edge parts to be located inside the roll welding-applied steel pipe are ground to obtain a desired band steel edge shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is an online continuous method for grinding a steel strip edge and its vicinity to remove burrs, adhering scales and other unwanted substances, and to form a strip steel edge in a forged steel pipe manufacturing process. The present invention relates to a strip steel edge shape forming device and a strip steel edge shape forming method by brushing.

[0002]

2. Description of the Related Art In the production of forged steel pipes, improving the reliability of the welded portion and suppressing the bead on the inner surface of the welded portion are very important issues for improving the quality of the forged steel pipe.
Conventionally, in order to improve the reliability of this weld,
A coil edge scale removing device as disclosed in Japanese Patent No. 13548 (Japanese Utility Model Publication No. 4-17318) is used. This device is a device that removes scales at the edge of the coil weld in order to prevent oxides from being mixed into the weld and to prevent the occurrence of penetrators in the production of electric resistance welded steel pipe. Further, conventionally, a method of grinding with a cutting tool has been adopted for grinding the edge portion of the steel strip.

[0003]

However, the above-mentioned conventional method and apparatus have the following drawbacks. That is, the device disclosed in Japanese Utility Model Laid-Open No. 63-113548 is only a device for removing the scale of the edge portion of the electric resistance welded steel pipe, and follows the bending tendency of the strip steel running at high speed like a forged welded steel pipe. Is insufficient, and shape grinding of the edge part is not desirable. Further, the method of using a cutting tool for grinding the edge portion of the steel strip has problems that it is difficult to adjust the cutting amount and that secondary burrs are generated. In addition, the suppression of the bead on the inner surface of the welded part was dealt with by reducing the pressing amount of the edge part at the time of forging welding, but if the pressing amount is reduced, the flatness of the steel pipe abutting part will be reduced, which is a preferable countermeasure. It wasn't the way.

The present invention eliminates the drawbacks of these conventional methods and apparatuses, and obtains a good abutting portion of a forged steel pipe by removing the scale of the steel strip edge portion and grinding the steel strip edge portion during the production of the forged steel pipe. For the purpose of providing a strip steel edge shape forming device and a strip steel edge shape forming method.

[0005]

Means for Solving the Problems The main features of the present invention are: (1) In a device for removing burrs and burrs at an edge portion of a strip steel for manufacturing a forged steel pipe, pedestals are provided on both sides of the strip steel. An apparatus for forming a shape of a strip steel, which is provided with a pair of rotary brush rolls capable of inclining horizontally and vertically on the pedestal. And (2) (1)
Using the described device, the brush roll is angled in the vertical direction θ
_{It is characterized in that the} side with steel strip is inclined upward by ₁ and the side with steel strip is inclined horizontally by angle θ ₂ toward the steel strip side, and the edge of the steel strip inside the steel pipe after forging is ground. Forming method of steel strip edge. However, θ ₁ > tan ⁻¹ (t / L) θ ₂ > tan ⁻¹ (0.12 t / L) t: strip steel thickness (mm) L: brush roll axial length (mm).

A detailed description will be given below with reference to the drawings. Figure 1
Is a shape forming device for a steel strip edge according to the present invention. In the figure, pedestals 9 are provided on both sides of a running steel strip 12 on which moving bases 5 are moved along a line by screw screws 10. The pedestal 9 is fixed to a floor (not shown), and the movable table 5 is moved back and forth by rotating the screw 6 around the axis by turning the handle 6 by a motor (not shown) or manually. ,
The turntable 13 equipped with the motor 4 turns,
It can be fixed with bolts after determining the angle of inclination in the horizontal direction.
Further, the brush roll 1 has a V
It is connected to the pulley 3 that receives the belt 2 with a universal joint, and the other end can be moved up and down with a screw screw.
As a result, it is possible to set a predetermined inclination in the vertical direction. The brush roll 1 is positioned by a combination of these.

The base 9 and the movable base 5 are connected by a bearing 7 of the base and a screw portion 8 of the movable base 5. Also, brush roll 1
By adjusting a speed reducer (not shown) by the motor 4 via the V-belt 2 and the pulley 3, a predetermined rotation speed can be obtained. Further, in some cases, high-speed rotation can perform heavy grinding.

The brush roll 1 is a disc-shaped roll which is usually commercially available and is formed into a cylindrical shape by a predetermined length, and the brush itself is a steel wire, a copper wire, a brass wire or the like, which may be used alone or in combination. Alternatively, a nylon material mixed with abrasive grains is used. In addition, this device uses the supporting force of the supporting roll 1 provided with the steel strip 12 at the tip of the moving table 5 by the reaction force of the brushing.
By pressing it against No. 1, the vertical movement of the strip steel 12 is suppressed, secondary burr is not generated, and the brushing surface has good quality.

Now, the set values of the inclination angles in the horizontal and vertical directions will be described. FIG. 2 is a schematic diagram showing the positional relationship between the brush roll 1 and the strip steel 12. (A) is a side view and (b) is a plan view. In the brush roll 1, in the vertical direction, the strip steel entry side is inclined upward by an angle θ _{1 with} respect to the horizontal line, and in the horizontal direction, Inclining the steel entrance side inwardly with respect to the strip steel axis by an angle θ ₂
The steel strip 12 is rotated in the pressing direction to grind the edge portion of the steel strip 12. Where θ ₁ > tan ⁻¹ (t / L),
θ ₂ > tan ⁻¹ (0.12 t / L), where t is the strip steel thickness,
L is the axial length of the brush roll.

The reasons for limiting the ranges of θ ₁ and θ ₂ will be described below. If θ ₁ ≤ tan ^-1 (t / L), it is not possible to grind all the portions in the thickness direction of the strip steel edge even with the entire length of the brush roll, so it becomes impossible to form the desired strip steel edge shape. Moreover, the burr on the edge cannot be completely removed. In addition, θ ₂ ≤ tan ^-1 (0.12t /
L), when welding after tubular forming of the steel strip, the groove is a butt open to the outer surface, and the inner bead rises,
The shape quality of the steel pipe deteriorates. It should be noted that 0.12t is a half of the difference in circumferential length between the inner surface and the outer surface when the steel strip is tubularly formed, and is a value determined empirically.

[0011]

Next, the method of forming the shape of the steel strip edge by brushing according to the present invention will be described with reference to FIG. The strip steel 12 that has supported on the line and traveled through the rolls 11 is rotated by the motor (not shown) or the handle 6 while the brush rolls 1 of the above-described device are being rotated. 1 is moved in the width direction of the strip steel to adjust the pressing amount to the edge portion of the strip steel, and at the same time, the brush roll rotation axis is set to a predetermined angle in the horizontal direction and the vertical direction. Not only can burrs and burrs on the edge be removed, but the excessively large protrusion bead can be suppressed by performing grinding (beveling) of the edge angle equivalent to the inner protrusion bead during forging welding. You can

The edge portion is ground into a predetermined groove shape by the above-mentioned method, and the groove shape is such that one side of the edge is shaved as shown in FIG. Regarding the groove shape, if the supporting roll 11 is lifted so that the strip steel 12 passes through the upper portion of the brush roll 1, the opposite side of the edge portion can be ground. By taking the groove in this way, the strip steel 12 is formed in a ring shape as shown in the lower part of FIG. 3, and then forged, so that the bead on the inner surface of the welded portion due to the pressing of the edge portion during forged welding is suppressed. To be done.

[0013]

INDUSTRIAL APPLICABILITY According to the present invention, the inclusion of a welded portion which reduces the forge strength by removing the scale of the edge portion of the steel strip and continuously and stably removing the burr and the burr to form the shape of the edge portion. Therefore, the reliability of the welded portion was improved, and the protrusion was suppressed in the bead shape.

[Brief description of drawings]

FIG. 1 is a view of an apparatus for shaping a steel strip edge according to the present invention.

FIG. 2 is a diagram showing a positional relationship between a brush roll and a strip steel.

FIG. 3 is a cross-sectional view of a strip steel and a ring-shaped steel when the strip steel edge portion is shaped by the device of the present invention.

[Explanation of symbols]

 1 Brush Roll 2 V Belt 3 Pulley 4 Motor 5 Moving Base 6 Handle 7 Bearing 8 Screw Part 9 Pedestal 10 Screw 11 Support Roll 12 Strip Steel

Claims (2)

[Claims] 1. A device for removing burrs and burrs at an edge portion of a strip steel for producing a forged steel pipe, wherein pedestals are provided on both sides of the strip steel, and the pedestal can be inclined horizontally and vertically. A strip steel edge shape forming device having a pair of rotary brush rolls. 2. The apparatus according to claim 1, wherein the brush roll is inclined vertically at an angle θ ₁ on the side with the steel strip, and horizontally with the side on the steel steel side having an angle θ ₂ on the steel strip side. A method for forming a shape of a steel strip edge, comprising the step of grinding a steel strip edge portion that is inclined to the inside and becomes the inside of a steel pipe after forging welding. However, θ ₁ > tan ⁻¹ (t / L) θ ₂ > tan ⁻¹ (0.12 t / L) t: strip steel thickness (mm) L: brush roll axial length (mm)