JPS5852015Y2 - Pipe inner bead cutting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to an improvement of a tube inner bead cutting device for cutting an inner bead formed at a seam portion of an electric resistance welded tube.

Generally, this type of device heats and melts both edge portions 41a of an open pipe 41, which is formed by bending a skeleton into a substantially O-shaped cross section so that the edge portions on both sides face each other, as shown in FIGS. 4 and 5. The open pipe 4 is passed between squeeze rolls 42 and collide welded to form a pipe 43.
A mandrel 44 that extends from the upstream side of the open pipe 41 into the pipe 43 is provided with a cutting tool 45 facing the inner bead of the pipe 43 at the top end of the mandrel 44 , and one end of the mandrel 44 is provided at the bottom end of the mandrel 44 . Support frame 46 pivoted to
The support frame 46 is connected to an operating rod 48a of a hydraulic cylinder 48 built into the header 44', and the hydraulic cylinder 48 is actuated to rotate the support frame 46 around the shaft. 46a and header 44'.
is moved in the radial direction of the tube 43, the cutting tool 45 is moved closer to or closer to the inner bead 43a, and the pressing force of the cutting tool 45 against the inner bead 43 can be adjusted.

By the way, since the lower roller 47 is configured to move in the radial direction of the tube by utilizing the deflection of the mandrel 44 and adjust the pressing force of the cutting tool 45 against the inner bead 43a, the circumferential surface of the lower roller 47 and the inner surface of the tube are Although the rolling force of the lower rollers 47 is extremely large, since the lower rollers 47 are arranged downstream of the squeeze rolls 42 and furthermore at the lower part of the inner surface of the pipe, the squeeze rolls 42 are applied to both edges 41a of the open pipe 41. A large amount of flash F, which is generated near the welding point W between the two and deposited on the lower part of the inner surface of the tube, is suppressed between the circumferential surface of the lower roller 47 and the inner surface of the tube, and the position of the cutting tool 45 relative to the inner bead is displaced, and the bead is removed. In addition to producing cutting residue or undercut flaws on the inner surface of the tube due to overcutting, this also causes flash press-in flaws on the inner surface of the tube, resulting in many defective products when ERW tube is used as a drawn blank tube. This caused inconveniences such as a significant decrease in yield.

For this reason, conventionally, the lower roller 47 is shaped like a pincushion or a drum, as shown in FIG. Although it is configured to be transposed to,
Due to the structure of the lower roller 47, there is a limit to enlarging the dimension between the rolling contact points p and q of the lower roller 47 with respect to the inner surface of the tube, and the space for the flash reservoir is small, especially in the case of a small diameter tube. There were drawbacks such as poor bead cutting and frequent occurrence of flash press-in flaws on the inner surface of the tube.

The present invention was devised in view of the above circumstances, and its purpose is to provide a cutting tool whose front and rear intermediate portions are pivotally supported on the tip of the mandrel, and which cut the bead on the inner surface of the pipe, as well as the front and rear of the tool. A mounting frame is provided with an upper roller pivotally mounted to the upper roller, and has a cutting bead discharge port extending upward and downward on the upstream side of the cutting tool, and a mounting frame provided at the tip thereof extending left and right in the shape of... Left and right lower rollers are pivotally supported on the mounting portion at positions separated in the circumferential direction around the inner bottom surface of the pipe, and the base end is pivoted on the upstream side of the pivot position of the mounting frame. a rod having one end pivotally supported in the middle part of the fitting, a proximal end extending outside the tube and connected to the front and rear moving means, and a rod introduced from outside the tube and connected to the lower roller. By providing a fluid supply pipe near the upstream side of the lower roller with a pressure fluid outlet facing upstream of the contact position of the lower roller, the lower roller has an inclined surface with an angle of repose equal to or higher than that of the flash. Since the tread surface of the lower roller comes into contact with the inner surface of the tube, there is very little flash.Furthermore, since the pressure fluid is accurately injected from the position immediately before the tread surface, the remaining fine flash is minimized. It is an object of the present invention to provide a tube inner surface bead cutting device which eliminates all of the beads without remaining, and which does not cause any pressing flaws or cutting defects on the inner surface beads.

Hereinafter, the present invention will be specifically explained based on drawings showing embodiments thereof.

Fig. 1 is a vertical cross-sectional view showing a pipe inner bead cutting device according to the present invention (hereinafter referred to as the device), and Fig. 2 is a diagram showing ■-■ in Fig. 1.
3 is a front view of the support, and 1 in the figure is an open pipe, in which the skeleton is passed through a group of forming rolls and the cross section is U-shaped, with the edge portions 1a on both sides facing each other. The open pipe 11/i is bent into an O-shape, is passed through the work coil 2, and has edges 1 on both sides.
A is heated and melted and passed between squeeze rolls 3, and the edge portions 1a on both sides are butt welded to form a tube 4. is installed.

The proposed device A includes a mandrel 5, a cutting tool 7 installed on a header 6 provided at the tip of the mandrel 5, and an upper roller 8u.
, 8u, a lower roller 8d serving as an abutting member constituting an adjusting member for adjusting the pressing force of the cutting tool 7, and a mounting member 9 serving as its mounting member.
Also, a hydraulic cylinder 11 as a driving source for adjustment and a rod 1 as a connecting member connecting the hydraulic cylinder 11 and the fixture 9.
2. The link lever 13 and the like are its main components.

The mandrel 5 has a cylindrical shape and is arranged concentrically between the open pipe 1 and the pipe 4, and its base end is connected to the outside of the open pipe 1 through between the edge portions 1a on both sides of the open pipe 1. It is guided out and fixed to one of the forming roll stands (for example, any stand ranging from a breakdown roll stand to a fin pass roll stand), and its tip extends into a tube 4, where a header 6 is provided. It is being

The header 6 is formed on an extension of the tip side of the mandrel 5 with a pair of left and right side plates 6a and a connecting plate 6b extending between them, facing each other at a distance in parallel.The header 6 is buttoned on the inner surface of the tube 4. On the side facing the bead 4a, that is, on the upper side, a mounting frame 10 is used to attach a cutting tool 1 and a pair of upper rollers 8u, 8u.
is arranged, and a lower roller 8d is installed on the lower side of the casing using a support frame 9.
is installed.

The mounting frame 10 includes a pair of mounting plates 1 having an inverted triangular shape when viewed from the side.
0a.

The connecting plates 10a are arranged in parallel with each other at a required distance between the connecting plates 10b, and the lower apex is connected between the side plates 6a of the header 6 between the side plates 6a, 6a. It is rotatably supported around a shaft 10c extending horizontally in a direction perpendicular to the axis of the mandrel 5.

The cutting tool 7 is fixed to a holder 7a fixed in the upper and downstream direction, that is, in the middle part in the front and back direction, between the mounting plates 10a and 10a of the mounting frame 10, with its cutting edge facing toward the tip side of the mandrel 5, and when assembled. The upper rollers 8u and 8u are attached to the mounting plate 10 of the mounting frame 10 on the upstream and downstream sides of the cutting tool 7, respectively.
It is rotatably supported around shafts 8a and 8a extending between a and 10a.

On the other hand, the mounting fixture 9 is formed by using a pair of support plates 9a and a connecting plate 9b with 9a passed between them, and is framed in parallel with a required distance, and one end of the fixture 9 is connected to the side plates 6a and 6 of the header 6.
The mounting portions 91 are rotatably supported around a shaft 9c extending between the side plates 6a, 6a between the two sides of the mandrel 5, and extend in the direction perpendicular to the axis of the mandrel 5, that is, in the left-right direction.
．． '9r is formed and the button is attached, each mounting part 913.9r
A pair of lower rollers 8d and 8, which are abutting tools, each having a shaft on the upper surface.
d is pivotally supported, and the rain lower rollers 8d and 8d are located at a position separated from each other by 1/4 circumferential length corresponding to approximately 900 mm in the circumferential direction, centering on the lower center of the inner surface of the pipe 4, that is, the flash slides down. It is designed so that it comes into contact with the inner surface of the pipe which has a fairly steep slope.

The distal end of a rod 12 disposed within the mandrel 5 is pivotally connected to the intermediate portion of the fixture 9 using a shaft 12a, and the proximal end of the rod 12 is connected to the curved portion at the proximal end of the mandrel 5. It penetrates and projects upstream thereof, and is connected to the hydraulic cylinder 11 via a link lever 13 provided on the support 14 outside the open pipe 1, and is also slidably connected to the support 14 itself. There is.

As is clear from FIG. 3, the support 14 includes a plate-shaped mounting part 14a for fixing it to the forming roll stand, a plate-shaped bracket 14b for mounting the hydraulic cylinder 11 provided above the plate-shaped mounting part 14a, and a plate-shaped mounting part 14a for fixing it to the forming roll stand. A supporting rod 14c protrudes from the downstream side of the mounting portion 14a, and a cylinder 14d with a spline cut on the inner surface provided below the plate-shaped mounting portion 14a is provided. An elongated hole 14a curved in an arc shape centered on the body 14d is formed, and a hole is passed through the elongated hole 14a so that the position can be adjusted with respect to the forming roll stand S.

The hydraulic cylinder 11 is pivotally supported on the bracket 14b of the support 14 using a shaft 11b, and the intermediate portion of the link lever 13 is pivotally supported on the support rod 14c using a shaft 13c.
Furthermore, a rod 1 with splines cut in the same manner is attached to the cylinder body 14d.
The proximal ends of 2 are slidably fitted with a spline.

-i of the link lever 13 is connected to the hydraulic cylinder 11 using a pin.
It is pivoted on an operating rod 11a, and the other bent end is equipped with a cylindrical body 13a, which is fitted into the rod 12, and its movement in the axial direction is controlled by screwing into the rod 12. It is regulated by the combined NAND 12bi2b.

When the hydraulic cylinder 11 is actuated and the operating rod 11a is moved forward and backward, the link lever 13 rotates around the shaft 13c, and the rod 12 is moved back and forth in the longitudinal direction of the shaft.
is rotated around the shaft 9c at one end thereof, and the rain roller 8d,
8d is moved upward and downward relative to the mandrel 5, and the cutting tool 7 is moved toward and away from the inner bead 4a, thereby making it possible to adjust the pressing force against the inner bead 4a.

Reference numeral 15 denotes a water or air supply pipe for removing flash, which is arranged along the lower surface of the mandrel 5, and its tip is bifurcated in the middle to provide a connection between the lower rollers 8d, 8d and the inner surface of the pipe. The opening faces directly upstream of the contact position, and the base end is connected to a water tank or the like (not shown) via a pump, and pressurized fluid is supplied from the outlet to the contact surfaces of the rollers 8d and 8d. It is designed to eject and remove all remaining fine flash.

In the device of the present invention having a sniff structure, a lower roller 8d is used with respect to the mandrel 5 in order to adjust the position of the cutting tool 7 with respect to the inner bead 4a or the cutting depth.

Hydraulic cylinder 1 as a driving source for adjusting 8d upward and downward
1 is placed outside the tube 4, the mandrel 5,
In particular, it is extremely easy to downsize the header 6, which greatly expands the scope of application to small-diameter pipes, and also makes maintenance and inspection of the hydraulic system easy, and the power amplifier of the hydraulic cylinder 11 itself can be freely controlled. In addition, the lower roller 8d and the fixture 9 can be operated accurately, and the pressing force of the cutting tool 7 against the inner bead 4a can also be adjusted accurately.

In addition, since the pi) 7 and the upper rollers 8u and 8u are mounted so that they can rotate around the axis with respect to the header 6 using the mounting frame 10, the inner surface of the pi) will also be fixed even when the pipe 4 runs on a corrugated nail.
The cutting tool 7 can accurately follow the inner bead 4a, and cutting defects such as uncut portions of the inner bead 4a or undercut flaws on the inner surface of the tube 4 can be prevented.

Further, the lower rollers 8d, 8d are arranged so as to face the lower part of the inner surface of the tube 4, and to be in rolling contact with the inner surface of the tube 4 at a distance from each other in the circumferential direction, and furthermore, to be placed immediately upstream of the rolling contact position of the lower rollers 8d, 8d with respect to the inner surface of the tube. Since water or air is supplied through the fluid supply pipe, the flash is removed from the contact position of the lower rollers 8d and 8d, so that the flash is not pressed down below the lower rollers 8d and 8d, and is placed on the inner surface of the tube. No flash press-in flaws are formed.

In the above-described embodiment, the lower roller 8d is used as the abutting tool, but it goes without saying that a shoe or the like may be used instead of the roller.

As described above, in the present device, the rolling contact position of the lower roller with respect to the lower part of the inner surface of the tube is spaced apart in the circumferential direction of the tube, and the space around the lower part of the inner surface of the tube, which should become a flash reservoir, is widened and deposits accumulate. The flash produced by the abutting tool is not disturbed by the abutting tool and the mounting member, and the fluid supply port is placed in front of the contact point of the abutting tool against the inner surface of the pipe, so the abutting tool should be in contact with the pipe. Since the flash is removed from the position on the inner surface of the tube, the flash is not pressed under the abutting tool, and press-in flaws are reliably prevented.

Furthermore, in the present invention, the rod that operates the lower roller mounting device is led out and connected to the front and rear moving means, so the configuration of the mandrel tip is simplified and maintenance and inspection can be easily performed. obtain.

Furthermore, in the present invention, the cutting tool is attached to a mounting frame with upper rollers at the front and back, so it has the advantage that it can accurately follow the bead even when the pipe is running on a corrugated nail. .

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view showing the proposed device in use, Figure 2 is a cross-sectional view taken along the line ■-■ in Figure 1, Figure 3 is a front view of the support, and Figure 4 is a longitudinal cross-section of the conventional device. The top view and FIG. 5 are cross-sectional views taken along the line ■-■ in FIG. 4. 1... Open pipe, 4... Pipe, 5... Mandrel, 7... Bit, 8d... Lower roller, 9... Fixture, 9Z. 9r... Attachment part, 15... Fluid supply pipe.

Claims (1)

[Scope of utility model registration request] The tip of the mandrel is pivotally supported at its front and rear intermediate portions, and is equipped with a cutting tool for cutting the tube inner bead, and an upper roller pivotally attached to the front and rear of the tooling tool, and an upper roller and a lower roller on the upstream side of the tooling tool. a mounting frame having a cutting beet outlet extending to;
The lower rollers, which contact each other at positions spaced apart in the circumferential direction around the inner bottom surface of the tube, are pivotally supported by the left and right mounting parts provided at the tip and extending in a left and right shape. , a fitting whose proximal end is pivoted upstream of the pivot position of the mounting frame, one end of which is pivoted to an intermediate portion of the fitting, the proximal end extending outside the tube, and a front; A fluid supply including a rod connected to the rear moving means and a pressure fluid outlet introduced from outside the tube and facing upstream of the lower roller to eliminate flash at the upstream side of the contact position of the lower roller. A tube inner surface bead cutting device characterized by comprising a tube.