JP3394656B2 - External bead cutting device for ERW steel pipe - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer bead cutting device for ERW steel pipe.

[0002]

2. Description of the Related Art ERW steel pipes are made by bending a material strip into a cylindrical shape with a forming roll, performing upset welding on the seam, forming with a squeeze roll, and then cutting the weld beads on the inner and outer surfaces. And make it a product. A conventional external bead device is shown in FIG. In this device, the entire cutting device 66 is mounted on the frame 61, and is guided by the upper and lower guides 62 by the upper and lower cylinders 64 to move up and down as shown by an arrow 65. The cutting device 66 suspends an elevating head 69 via a compression spring 67.
As shown by the arrow 70, it is guided by 8 and can move up and down. The cutting blade 12 for cutting the bead is attached to a swinging cutting blade holder 71. The cutting tool holder 71 has its tail end coupled to the elevating head 69 with a pin 73, and can swing about the pin 73. The cutting blade holder 71 has a copying roller 74 attached to its tip,
The cutting blade 12 is attached to an intermediate portion between the copying roller 74 and the pin 73. The cutting tool holder 71 swings to ascend to the swing position 75. A spring 72 for adjusting the pressing force of the cutting blade 12 is provided.

In such a conventional external bead cutting device, (a) the cutting amount adjusting system moves the lifting head 69 up and down,
Since the cutting blade holder 71 has a two-degree-of-freedom system for swinging, it is not easy to finely adjust the cutting amount of the cutting blade 12. (B) Since the positions of the copying roller 74 and the cutting blade 12 are displaced by about 90 mm in the longitudinal direction of the tube 51, the ability of the cutting blade 12 to follow the vertical movement of the tube 51 is poor. In particular, as shown in FIG. 4, the influence is great at the front and rear ends of the pipe with large vertical fluctuation, and cutting becomes unstable. There was a problem. FIG. 4 shows the tip 5 of the pipe 51 formed by the squeeze roll 53.
5 is bent, and when bitten into the pinch roll 54, it behaves as shown by an arrow 56, and the cutting amount of the cutting tool 12 changes. For this reason, as illustrated in FIG. 5, insufficient cutting or excessive cutting occurs in the bead portion of the pipe 51, and fluctuations 57 in the cutting width, chatter 58, and pipe cutting 59 cannot be avoided.

[0004]

The present invention has been improved in order to solve the above problems. An object of the present invention is (a) to stabilize the cutting quality of the cutting beads of an electric resistance welded pipe (b) to reduce the loss length at the front and rear ends of the pipe.

[0005]

Means for Solving the Problems The technical means of the present invention for solving the above-mentioned problems are as follows: (1) The copying roller is divided into left and right parts, which are arranged laterally in the immediate vicinity of the blade, and the position of the copying roller in the line direction. And the position of the cutting tool were within ± 20 mm. (2) The cutting tool holder uses a spring direct-acting copying method to improve the responsiveness to changes in the pipe.

(3) The relative height between the copying roller and the cutting blade is adjusted according to the pipe diameter. (4) The copying roller shaft is an eccentric shaft, and the eccentric amount is changed by rotating this shaft so that the relative height between the pipe and the cutting blade can be easily adjusted according to the pipe diameter. (5) The cutting depth of the cutting tool is finely adjusted by the automatic position control that controls the bead shape after cutting.

Accordingly, the present invention is the outer surface bead cutting apparatus ERW pipe, and two rollers in contact with the tube outer surface of the last two next the copying roller cutting tool to guide the height of the cutting blade, said roller Has a large diameter on the side close to the blade
The position of the cutting blade and the copying roller in the line direction is ± 20
The bead cutting device for an outer surface of an electric resistance welded steel pipe is characterized in that it is arranged within mm. The copying roller is in contact with the outer surface of the pipe on both sides of the cutting blade in the immediate vicinity. The contact portion has a cylindrical shape with a narrow width, and except the contact portion, the roller has an appropriate shape having a smaller diameter than the contact portion, and the side close to the blade has a large diameter and abuts on the outer surface of the tube. As a result, the cutting blade can be brought into contact with the pipe outer peripheral surface in the immediate vicinity, an error in the contact position due to a difference in pipe diameter can be prevented, and the accuracy of copying can be improved.

In the present invention, the line direction positions of the cutting blade and the copying roller are arranged within ± 20 mm. In the present invention, the copying roller directly supports the vertical position of the blade supporting holder, and the line direction positions of the cutting blade and the copying roller are ±
If the distance is larger than 20 mm, the bead cutting accuracy is lowered due to the difference between the position of the copying roller and the position of the bead cut by the cutting blade, which is not preferable.

Further, in the above-mentioned outer bead cutting device,
The cutting blade holder, it is preferable that the pressure spring to the cutting blade is linear up and down, Ru mounting and copying rollers roll on extravascular surface of the both side of the bead. Further, the present invention is an outer bead cutting device for an electric resistance welded steel pipe, which is equipped with a mechanism for vertically adjusting the height of the copying rollers attached to both sides of the cutting blade according to the pipe diameter. In case,
The mechanism for vertically adjusting the height of the copying roller can be easily adjusted by using a mechanism for changing the amount of eccentricity by rotating the eccentric shaft with the shaft fitted with the roller as an eccentric shaft. Makes it easy to do automatically. Of course, other mechanisms can be used, but this mechanism can very easily adapt to changes in pipe diameter.

Further, according to the present invention, a cutting bead shape detecting device is provided in the wake of the cutting blade, and an adjusting device for finely adjusting the vertical movement of the cutting blade based on the detection value of this detecting device is provided. It is possible to fundamentally improve the cause of poor cutting quality that occurs during bead cutting. In this case, by using the relative height adjusting mechanism of the copying roller with the cutting blade, it is possible to easily form an automatic adjusting mechanism having excellent responsiveness and high accuracy.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial sectional front view of an embodiment of the present invention, and FIG. 2 is an overall side view. As shown in FIG. 2, the bead cutting device of the present invention is suspended from a lifting frame 32 by a hydraulic cylinder 33 for quick opening, and the lifting head 31 is guided by a lifting guide 34 to move up and down. The traverse shift shaft 35 enables traverse (movement in the depth direction of FIG. 2). The elevating head 31 moves the elevating frame 32 from the elevating frame 32.
Is hung through. The elevating head 31 includes a hydraulic clamp device 11 that clamps a cutting blade, and the cutting blade 12 is attached and supported by this device. Copy rollers 21 are provided on both sides of the cutting blade 12 so as to come into contact with the pipe 51.

The pipe 51 advances in the direction of arrow 52 and is bead cut by the cutting blade 12. According to the present embodiment, the copying roller 21 is located on both sides of the cutting blade 12 in the immediate vicinity thereof, and the pressing spring 36 is moved linearly to form a one-degree-of-freedom system, so that the response is good and the bead cutting is accurately performed. 1 is a front view,
The copying roller 21 is shown in cross section. Copying roller 21
Is a taper roller that is in contact with the upper surfaces of the tubes 51 on both sides of the cutting blade 12 in the immediate vicinity. The large diameter side of the taper roller contacts the tube 51. By this, cutting blade 1
It is possible to make contact with the outer peripheral surface of the pipe 51 closest to the second pipe 2, prevent an error in the contact position due to a difference in pipe diameter, and improve the accuracy of the guide. The distance from the cutting blade 12 to the contact position of the copying roller 21 with the tube 51 is 5 mm.
It can be: Further, the copying roller 21 is a tapered roller, which occupies a small space and has a sufficiently long fitting length with the shaft, whereby the rigidity with the roller shaft can be secured.

The right half of FIG. 1 shows the case where the tube 51 has a small diameter and the radius R ₁ is small, and the left radius of FIG. 1 shows the case where the tube 51 has a large diameter and the radius R ₂ is large. In the case of both the left and right sides, the relative height between the side guide roller 21 and the cutting blade 12 must be changed. Side guide roller 2
1, a part of the support shaft 22 is an eccentric shaft 25,
The eccentric shaft 25 is rotatably fitted on the eccentric shaft 25 via a bearing. In the eccentricity adjusting device 23, the side guide roller 21 is externally fitted by rotating the shaft 22. For example, a combination of a worm and a worm wheel may be used.

When the relative height of the side guide roller 21 to the cutting tool 12 is adjusted by changing the eccentricity 24 of the eccentric shaft, this adjustment amount is the position of the side guide roller 21 and the pipe 5.
Since it is uniquely determined by the outer diameter of No. 1, it can be automatically set by giving the data of the pipe diameter during pipe making. In this case, as shown in the control flow sheet in FIG. 6, a cutting bead detecting device 81 is provided in the wake of the cutting blade 12, and the cutting blade 1 is based on the detection value of the detecting device 81.
The vertical movement fine adjustment amount 2 is calculated by the control device 82, and the necessary control amount is output to the cutting blade vertical adjustment device 83 for feedback control. A laser range finder or the like can be used as the detection device 81, and an eccentricity amount adjustment device 23 that finely adjusts the eccentricity amount of the eccentric shaft that supports the side guide roller 21 can be used as the cutting blade adjustment device 83.

[0015]

According to the present invention, the responsiveness of vertical movement of the bead cutting tool is good, and since the copying roller is based on the outer peripheral surfaces of the pipes on both sides of the cutting tool, the shape of the bead after cutting is accurate. Will not cause product defects.

[Brief description of drawings]

FIG. 1 is a partially sectional front view of an apparatus according to an embodiment.

FIG. 2 is a side view of FIG.

FIG. 3 is a side view of a conventional device.

FIG. 4 is an explanatory diagram showing the behavior of a conventional device.

FIG. 5 is an explanatory view showing a cutting shape of a bead.

FIG. 6 is a flow sheet of an apparatus for controlling the cutting shape of a bead.

[Explanation of symbols]

11 Hydraulic clamp device 12 cutting blades 21 Copying roller 22 Support shaft 23 Eccentricity adjustment device 24 Eccentricity 25 eccentric shaft 31 Lifting head 32 Lifting frame 33 hydraulic cylinder 34 Lifting guide 35 Traverse shift axis 36 Spring for reduction 51 tubes 52 arrow 53 Squeeze Roll 54 pinch rolls 55 pipe end 56 arrow 57 fluctuations 58 Bibiri 59 Pipe cutting 61 frames 62 Vertical guide 64 upper and lower cylinders 65 arrow 66 cutting equipment 67 Spring for reduction 68 Lifting guide 69 Lifting head 70 arrow 71 Cutting Tool Holder 72 spring 73 pin 74 Copying roller 75 Swing position 81 Detector 82 Control device 83 Cutting tool vertical adjustment device

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ identification code FI B23Q 35/04 B23Q 35/04 E 35/10 35/10 B (58) Fields investigated (Int.Cl. ⁷ , DB name) B21C 37/08 B23K 13/00 B23K 37/08

Claims (5)

(57) [Claims] The outer surface bead cutting apparatus according to claim 1] electric resistance welded steel pipe, and two rollers in contact with the tube outer surface of the nearest both lateral of the copying roller cutting tool to guide the height of the cutting blade, 該Ro
The outer bead cutting device for an electric resistance welded steel pipe is characterized in that the roller is a roller having a large diameter on the side close to the blade, and the position of the cutting blade and the copying roller in the line direction is within ± 20 mm. 2. The cutting tool holder is provided with a rolling spring for directly moving the cutting tool up and down, and a copying roller rolling on the outer surface of the bead on both sides of the bead.
An outer bead cutting device for an electric resistance welded steel pipe according to claim 1 . 3. A bead cutting device for an outer surface of an electric resistance welded steel pipe, comprising a mechanism for vertically adjusting a height of a copying roller attached to both sides of a cutting blade according to a pipe diameter. 4. The mechanism for vertically adjusting the height of the copying roller is a mechanism for changing the amount of eccentricity by rotating the eccentric shaft with an eccentric shaft as an axis into which the roller is fitted. External bead cutting device for the electric resistance welded steel pipe described. 5. A cutting bead shape detecting device is provided in the wake of the cutting blade, and an adjusting device for finely adjusting the vertical movement of the cutting blade based on a detection value of the detecting device is provided. 3. An outer bead cutting device for an electric resistance welded steel pipe according to 3 or 4.