JP2899385B2 - Weld bead cutter mechanism - Google Patents

Description

The present invention relates to a bead cutter mechanism for continuously cutting a weld bead after seam welding in a continuous steel pipe manufacturing apparatus.

(B) Prior art A conventional welding bead cutter mechanism was configured as shown in FIGS.

FIG. 5 is a side view of a conventional weld bead cutter mechanism, and FIG. 6 is a front view of the same as viewed from the ERW pipe forming line.

Even with the conventional weld bead cutter mechanism, in order to cut the weld bead of the steel pipe that flows continuously, if only one cutting bit is used, if the cutting edges 21a and 21b are worn in the middle, replace it. Therefore, it is necessary to stop the entire continuous steel pipe manufacturing apparatus, and in order to avoid this, the cutting edges 21a and 21b are arranged at positions before and after the steel pipe line.

(C) Problems to be Solved by the Invention However, when the cutting edges 21a and 21b are arranged at positions before and after the electric resistance welded pipe forming line, the respective cutting edges 21a and 21b are joined from the seam welded portion. The degree of temperature drop after welding is different because the distance to the cutting edge is different.Therefore, the sharpness of the cutting edges 21a and 21b is different, and the cutting tool material and cutting position are the optimal conditions for making the cutting edges 21a and 21b last longer. There was a problem that it was difficult to select one.

In addition, there is a problem that two sets of a cutting bit lifting mechanism, a steel pipe support mechanism, and a cutting bead transfer processing mechanism are all required.

Also, since the cutting edges 21a and 21b do not swing left and right,
The tool at the same position was constantly cut, and the tool was worn quickly.

Also, when switching between the front and rear cutting edges 21a, 21b, it is necessary to master the operation at the moment of switching, and since the timing of switching from the front to the rear and from the rear to the front is different, the bead is excessively cut. And there were some parts that were not cut.

22 drives the cutting edge adjusting devices 23a, 23b to cut the cutting edges 21a, 2
The position of 1b is adjusted up and down.

 The present invention solves such a problem.

(D) Means for Solving the Problems The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

In claim (1), a weld bead cutter mechanism for forming a cylindrical shape by a continuous steel pipe manufacturing apparatus, welding a joint portion by a continuous welding mechanism, and then continuously cutting a weld bead projecting to the welded portion, The left and right oscillating body 2 is composed of two left and right cutting edges 1a and 1b having the cutting edges fixed to the left and right oscillating body 2, and having the two cutting edges 1a and 1b fixed thereto.
Is arranged with the rotation center O1 slightly below the center O2 of the steel pipe A. Similarly, the cutting edge 1a or the cutting edge 1b is also configured to rotate about the rotation center O1. By rotating the cutting blade 2, the welding bead B projecting to the outer periphery of the steel pipe A is configured to be cut within the width of one of the cutting edges 1a or 1b in the cutting edge 1a or the cutting edge 1b. The welding bead B is configured to be cut within the width of the other cutting edge by rotating the left and right rocking body 2 in the opposite direction as the movement proceeds, and at the time of cutting, one of the cutting edges 1a and 1b is cut. The blade is always rocked at a constant width with the center within the width of the blade being the rocking center.

According to claim (2), in the welding bead cutter mechanism according to claim (1), the holding projections 5 and the cutting chip transport band 4 for transferring the cutting beads C cut by the cutting edges 1a and 1b upward. A guide plate 6 is provided, the cutting bead C is transferred between the holding protrusion 5 and the guide plate 6 while holding the cutting bead C, and the bead cutter 3 is disposed at the position of the transfer end of the guide plate 6. The cutting bead C is cut into small pieces by the rotation of the cutter 3.

(E) Embodiment The problems to be solved by the present invention are as described above, and means for solving the problems will be described below.

FIG. 1 is a side view of a weld bead cutter mechanism of the present invention,
FIG. 2 is a front view of a portion of the cutting blades 1a and 1b that can swing right and left, FIG. 3 is a side view showing a mechanism for transferring and cutting the cutting bead C, and FIG. FIGS. 5 and 6 are a side view and a front view of a conventional welding bead cutter mechanism showing the state of the body 5, the cutting bead C and the guide plate 6, respectively.

 This will be described with reference to FIG.

A seam welding device 31 is disposed at the rear of the forming roll 30, and a squeeze roll mechanism S is disposed at the rear. The weld bead cutter mechanism of the present invention is disposed at the rear of the squeeze roll mechanism S, and the sizing roll mechanism Z for final shaping of the steel pipe is disposed at the rear of the weld bead cutter mechanism.

The steel strip is gradually bent into a tubular shape by the forming roll 30 or the like, and the seam is welded into a steel pipe by the seam welding device 31, and the weld bead cutter mechanism cuts the raised portion of the welded meat, and then the sizing roll mechanism Z To form a perfect circle.

The welding bead cutter mechanism includes steel pipe transport rolls 11 and 11 disposed in front and rear, a guide device and a shredding device for a cutting bead C disposed in an upper part, and a left and right rocking body 2 disposed around a steel pipe A.
And two cutting edges 1a, 1b fixed to the left and right rocking body 2.
It consists of.

The left and right rocking body 2 is formed in a cylindrical shape, in which a steel pipe A flows continuously, and the outside is fixed by a bearing 19 from the frame side of the weld bead cutter mechanism.

Further, a height adjusting mechanism 20 of the left and right rocking body 2 is interposed between the lower frame and the lower frame. By adjusting the screw adjusting portion of the height adjusting mechanism 20, the overall position of the left and right oscillating body 2 and the cutting edges 1a and 1b can be raised and lowered to cope with the difference in the pipe diameter of the steel pipe A.

The fine adjustment of the positions of the welding beads B of the cutting edges 1a and 1b is performed by fine adjustment screws 10L and 10R described later.

The right and left oscillating body 2 needs to perform left and right oscillating with respect to the position of the welding bead B so that the entire width of the left and right cutting blades 1a or 1b performs uniform cutting.
Is configured to swing by a forward / reverse motor M provided on the outer periphery of the bearing boss.

That is, the rotation of the forward / reverse motor M is transmitted to the gear 16 via the speed reducer.
And the gear 16 meshes with the sector gear 17 spline-fitted to the left and right rocking body 2, and the gear 16 rotates forward and reverse, so that the sector gear 17 reciprocates within a narrow angle. is there.

Cutting edge 1a or cutting edge 1b provided on cutting tool 1L, 1R
Cuts the weld bead B, and the weld bead B becomes the cut bead C. The cutting bead C is configured to rise along the guide plate 6 and be cut by the bead cutter 3 rotated by the cutter shaft 12 while being held by the holding protrusion 5 and the guide plate 6.

Next, in FIG. 2, the cutting tool 1L, 1R and the cutting edge 1a,
The configuration of 1b will be described.

As shown in FIG. 1, the right and left rocking body 2 is rocked right and left by a forward / reverse motor M. The mounting portion of the cutting tool 1L, 1R is formed on the left and right rocking body 2, and the cutting tool 1L,
1R is attached, and the cutting edge 1 at the tip of the cutting tool 1L, 1R
The weld bead B protruding from the outer periphery of the steel pipe A is cut by a or the cutting edge 1b.

The left and right rocking body 2 has a center O1 slightly below the center O2 of the steel pipe A as a center of rotation, and the cutting edge 1a or the cutting edge 1b also rotates about the center O1 to form a weld bead B portion. Only the shape is cut along the outer circumference of the steel pipe A.

And the cutting edge 1a or the cutting edge 1b is, as described above,
It swings from side to side.

Usually, instead of cutting the weld bead B with both of the cutting edges 1a and 1b, rocking cutting is performed on one side, for example, within the width of the cutting bit of the cutting edge 1a, that is, the cutting of the cutting bit 1a. A fixed width (within the width of the cutting tool) with the center of the width as the swing center
Swung inside.

Next, when the cutting tool bit of the cutting edge 1a wears, a command is sent to the control circuit of the swing driving forward / reverse motor M to shift the swing center to the center position of the width of the cutting bit of the cutting tip 1b. Oscillating cutting is repeated within the width of 1b tool bit.

When cutting is performed over both of the cutting edges 1a and 1b, a cutting tool is broken at the joint between the cutting edges 1a and 1b.

In order to avoid this, it is configured to perform cutting with one of the cutting edge 1a or the cutting edge 1b.

In addition, when switching to the cutting edge 1a or the cutting edge 1b and then immediately switching the cutting edge 1a to a new one, if the entire configuration is swinging, the work of switching the cutting tool and the work of adjusting the height of the cutting tool are performed. At this time, the control circuit for the forward / reverse motor M has a built-in control circuit for performing the operation so that the swing operation is stopped and the cutting is continued only at the center position of the cutting edge 1b. I have. When the replacement of one of the cutting tools and the height adjustment are completed (the required time is 2 minutes), the state is again switched to the swing cutting state of one of the cutting tools.

The cutting tools 1L, 1R are provided with fine adjustment screws 10L, 10R, which enable fine adjustment of the vertical swinging body 2 in the vertical direction, so that fine adjustment can be performed when the protruding conditions of the left and right cutting edges 1a, 1b are aligned. Screws 10L and 10R are used.

And when wear of the cutting edge 1a, 1b occurs,
It is necessary to replace the cutting edge 1a or the cutting edge 1b without stopping the continuous steel pipe manufacturing apparatus. In this case, the swing of the left and right rocking body 2 is stopped and the position of the center of the width of one of the cutting tools is set. It stops at.

In this state, the state of cutting with only one of the cutting edge 1a or the cutting edge 1b in the stopped state is continuous, and the other cutting edge 1a or the cutting edge 1b is in a floating state and stopped. .

In this state, one of the cutting tools 1L and 1R is removed and replaced with a cutting tool equipped with a new cutting edge.
By repeating this state on the left and right, both cutting edges 1a and 1b can be replaced.

Next, the shredding mechanism of the cutting bead C will be described with reference to FIGS.

The cutting bead C cut by the cutting edges 1a and 1b has a biasing force in a direction in which the cutting bead C is spirally wound in a continuous state.
A spiral was formed one after another on a, 1b, and when this spiral became large, it was cut off due to weight and dropped.

Then, the vortex sometimes hinders the cutting of the cutting edge portions 1a and 1b.

In the present invention, in order to eliminate this condition, the cutting bead transport band 4 is provided so that the cutting bead C does not generate a spiral, and the holding projection 5 is projected on the outer periphery of the cutting bead transport band 4, and the holding is performed. The configuration is such that the cutting bead C is sandwiched between the recess provided in the projection 5 and the guide plate 6 and is conveyed to the bead cutter 3.

Then, the cutting bead C is shredded by the bead cutter 3 rotated by the cutter shaft 12. The cut bead C is housed in the receiver 14.

The cutting waste transporting band 4 is a sprocket or pulley 13a, 13b, 13
It is wound around c.

As shown in FIG. 4, the holding projection 5 has an arc-shaped concave portion, and the guide plate 6 is fitted into the concave portion so that the cutting bead C can be held between the two.

(F) Effects of the Invention The present invention is configured as described above, and has the following effects.

By providing the two cutting edges 1a and 1b on the left and right as in claim (1), the cutting position of the welding bead B is arranged at the same position with respect to the left and right cutting edges 1a and 1b.
The temperature drop after welding is the same, the sharpness and hardness are the same, the left and right cutting edges 1a, 1b can be the same, and even if the cutting edges are replaced on the left and right, almost the same welding beads The cutting state of B can be obtained.

In addition, since the left and right cutting edges 1a and 1b are constantly oscillated, the cutting of the welding bead B is performed by using the cutting edges 1a or the cutting edges 1b alternately, so that cutting is performed using only the same position of the cutting edges. Therefore, uneven wear of the cutting edge can be reduced.

Also, by swinging the cutting edges 1a and 1b to the left and right,
By stopping at the center of the width of one of the cutting edges 1a or 1b, the other cutting edge can be floated in a swing stop state, and the cutting edge can be replaced in this state.

Even after the replacement is completed, switching between the currently used cutting edge and a new cutting edge can be easily performed by swinging.

With the configuration as claimed in claim (2), it is possible to supply the bead C to the bead cutter 3 while continuously extending the cutting bead C that is to be spirally rounded after being cut by the cutting edges 1a and 1b. Bead cutter 3
As a result, the spiral is not formed, and the problem that the spiral is entangled with the cutting edge portions 1a and 1b and hinders the cutting is eliminated.

[Brief description of the drawings]

FIG. 1 is a side view of a weld bead cutter mechanism of the present invention, FIG. 2 is a front view of a portion of a cutting edge 1a, 1b which can swing right and left, and FIG. 3 shows a transfer / cutting mechanism of a cutting bead C. FIG. 4 is a side view, FIG. 4 is a plan view showing the state of the cutting waste transport band 4, the holding protrusion 5, the cutting bead C, and the guide plate 6, and FIGS. 5 and 6 are side views of a conventional welding bead cutter mechanism. It is a front view. DESCRIPTION OF SYMBOLS 1 ... Cutting bit 1a, 1b ... Cutting edge 2 ... Left-right oscillating body 3 ... Bead cutter 4 ... Cutting waste transport band 5 ... Holding protrusion 6 ... Guide plate

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) B23D 1/20-1/24 B23K 37/08 B23Q 11/00 B23B 25/00 B23D 13/00

Claims (2)

(57) [Claims] (1) A continuous steel pipe manufacturing apparatus is used to form a cylindrical shape.
In a weld bead cutter mechanism for continuously cutting a weld bead protruding from the welded portion after the seam portion is welded by a continuous welding mechanism, two left and right cutting edges 1a and 1b having cutting edges fixed to a left and right rocking body 2 are provided. The left and right oscillating body 2 to which the two cutting edges 1a and 1b are fixed is provided at the center O2 of the steel pipe A.
On the other hand, the rotation center O1 is disposed slightly below, and similarly, the cutting edge 1a or the cutting edge 1b is also configured to rotate about the rotation center O1, and the left and right rocking body 2 is rotated. ,
A weld bead B protruding from the outer periphery of the steel pipe A is configured to be cut within the width of one of the cutting edges 1a or 1b in the cutting edge 1a or the cutting edge 1b. By rotating the welding bead in the opposite direction, the weld bead B is configured to be cut within the width of the other cutting edge, and at the time of cutting, one of the cutting edges 1a and 1b is positioned at the center within the width of the cutting edge. A welding bead cutter mechanism characterized in that it is constantly rocked at a constant width around the rocking center. 2. The welding bead cutter mechanism according to claim 1, wherein the holding protrusions (5) and the cutting chip transport band (4) for transferring the cutting beads (C) cut by the cutting edges (1a, 1b) upward.
And the guide plate 6 are provided. The cutting bead C is transferred between the holding protrusion 5 and the guide plate 6 while holding the cutting bead C. The bead cutter 3 is disposed at the position of the transfer end of the guide plate 6. A welding bead cutter mechanism, wherein a cutting bead C is cut into small pieces by rotating the bead cutter 3.