Bead removal device and bead removal method

Abstract

To provide a bead removal device and a bead removal method which enable removal of an internal bead from a metal pipe.SOLUTION: A bead removal device 1 includes: a holding part 2 that holds a metal pipe 100 having an internal bead 105 formed at a welded part 104; and a removal part 3 that removes the internal bead 105 from the metal pipe 100. The removal part 3 includes: a drill part 31 that scrapes off the internal bead 105; a motor 321 as a rotational drive part that rotates the drill part 31; an operation part 322 for rotating the motor 321 by being operated by a worker; and an extension part 33 that is connected at one end to the drill part 31 and at the other end to the motor 321, and that extends along the direction of the rotation axis.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a bead removing device and a bead removing method for removing an inner bead from a metal pipe.

Background Art

[0002] Generally, a method of forming a metal pipe by bending a plate-shaped or strip-shaped metal member and welding the edges together is known. Conventionally, as a method of manufacturing such a metal pipe, a method of manufacturing an electric resistance welded steel pipe has been proposed in which the quality of the electric resistance welding conditions is determined by calculating the area of the discharged molten steel before and after electric resistance welding (see, for example, Patent Document 1). In the method of manufacturing an electric resistance welded steel pipe described in Patent Document 1, the suppression of welding defects is attempted by determining the quality of the electric resistance welding conditions as described above.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When a metal pipe is formed by electric resistance welding or other welding as described in Patent Document 1, beads may be formed at the joint. Such beads can be easily removed on the outer surface of the metal pipe, but it has been difficult to remove the beads on the inner surface. Although the inner beads are less likely to cause problems in terms of the appearance of the metal pipe, depending on the use of the metal pipe, other members may be inserted inside, and in order to suppress interference between the other members and the beads, it has been desired to remove the beads on the inner surface as well.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a bead removing device and a bead removing method capable of removing the inner beads of a metal pipe.

Means for Solving the Problem

[0006] In order to achieve the above object, the bead removing device according to the present invention includes a holding portion that holds a metal pipe having an inner bead formed on a welded portion, and a removing portion for removing the inner bead from the metal pipe. The removing portion includes a drill portion that scrapes off the inner bead, a rotational drive portion that rotates the drill portion, an operation portion for rotating the rotational drive portion by an operator's operation, and an extension portion having one end connected to the drill portion and the other end connected to the rotational drive portion and extending along the direction of the rotation axis.

[0007] In the bead removing device for a column member according to an aspect of the present invention, the holding portion includes a holding base that holds the metal pipe inside an angle formed between plate portions intersecting each other, and a holding force applying portion that applies a force in the direction toward the angle to the metal pipe.

[0008] The bead removing method according to the present invention is a bead removing method for removing the inner bead from the metal pipe using the above bead removing device. In a state where the metal pipe is held by the holding portion, the method includes a removing step of inserting the drill portion from an end opening of the metal pipe toward the central portion while rotating the drill portion.

Advantages of the Invention

[0009] According to the bead removing device and the bead removing method of the present invention, the inner bead of the metal pipe can be removed.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a schematic configuration of a bead removing device 1 according to an embodiment of the present invention, FIG. 2 is a perspective view showing a holding portion 2 of the bead removing device 1, FIG. 3 is a cross-sectional view showing a metal pipe 100 before removing an inner bead 105 by the bead removing device 1, and FIG. 4 is a cross-sectional view showing the metal pipe 100 after removing the inner bead 105 by the bead removing device 1.

[0012] As shown in FIG. 1, a bead removing device 1 according to an embodiment of the present invention includes a holding portion 2 that holds a metal pipe 100 in which an inner bead 105 is formed at a welded portion 104, and a removing portion 3 for removing the inner bead 105 from the metal pipe 100. The removing portion 3 includes a drill portion 31 that scrapes off the inner bead 105, a motor 321 as a rotation driving portion that rotates the drill portion 31, an operation portion 322 for rotating the motor 321 by an operator's operation, and an extension portion 33 having one end connected to the drill portion 31 and the other end connected to the motor 321 and extending along the direction of the rotation axis. Hereinafter, the bead removing device 1 will be specifically described.

[0013] The metal pipe 100 to be bead-removed by the bead removing device 1 is a stainless pipe formed in a cylindrical shape, as also shown in FIG. 3. This metal pipe 100 is formed into a partially open cylindrical shape by bending a plate-like or belt-like member, and is manufactured by welding the edges at the open portion. Note that the material of the metal pipe is not limited to stainless steel, and an appropriate material according to the application may be selected. Also, welding by an appropriate method according to the material may be employed.

[0014] The bead removing device 1 includes a holding part 2 and a removing part 3, and the holding part 2 and the removing part 3 are provided independently. Hereinafter, the vertical direction is defined as the Z direction, the extending direction of the metal pipe 100 when the metal pipe 100 is held in the bead removing device 1 is defined as the X direction, the direction orthogonal to both the X direction and the Z direction is defined as the Y direction, and the upper side and the lower side in the Z direction may be simply referred to as the upper side or the lower side.

[0015] The holding part 2 is provided, for example, on a workbench with adjustable height. As shown in FIG. 2, the holding part 2 has a holding table 21 and a holding force applying part 22.

[0016] The holding table 21 has two plate parts 211 and 212 with the X direction as the long side direction and the direction inclined with respect to the Y direction as the short side direction. The two plate parts 211 and 212 intersect with each other, and a corner part 213 is formed therebetween. The metal pipe 100 is held inside this corner part 213 (the side of the inner angle). Further, it is preferable that a sheet member for surface protection formed of rubber or elastic resin is provided on the upper surfaces of the plate parts 211 and 212 (the surfaces on the side where the metal pipe 100 is provided).

[0017] The holding force applying part 22 has an elastic part 221 that contacts the metal pipe 100, a shaft part 222 that extends upward in the Z direction from the elastic part 221, and an applying part (not shown) that applies a force in the lower Z direction to the shaft part 222. Although only one holding force applying part 22 is shown representatively in FIG. 2, as shown in FIG. 1, a plurality of holding force applying parts 22 are provided side by side in the X direction. The number of the holding force applying parts 22 may be appropriately set according to the length of the metal pipe 100.

[0018] The elastic part 221 is formed of rubber or elastic resin and contacts the metal pipe 100 at its lower surface or lower end.

[0019] The shaft portion 222 and the applying portion constitute a clamp. That is, in this clamp, by an operator operating an operating portion such as a handle, a force in the downward Z direction can be applied to the shaft portion 222, and the application of this force can be released.

[0020] When the operator operates the operating portion of the clamp to apply a force in the downward Z direction, the metal pipe 100 is sandwiched and held by the plate portions 211, 212 and the elastic portion 221. In such a holding state, when the drill portion 31 is inserted into the metal pipe 100 as described later, the metal pipe 100 is prevented from moving in the holding portion 2.

[0021] The removing portion 3 is an electric drill having a drill portion 31, an electric drill main body 32, and an extension portion 33. Incidentally, this electric drill may be a rechargeable type equipped with a rechargeable battery, or may be one that is used by being connected to a power source.

[0022] The drill portion 31 is a drill bit having a spiral outer peripheral surface, and its base end portion is a polygonal columnar connection portion through which rotation can be transmitted. The material of the drill portion 31 may be appropriately selected according to the material of the metal pipe 100 and the type of welding. Also, the outer diameter of the drill portion 31 is selected to be slightly smaller than the inner diameter of the metal pipe 100 to such an extent that it can be inserted into the metal pipe 100.

[0023] The electric drill main body 32 has a motor 321 as a rotational drive portion for rotating the drill portion 31, an operating portion 322 for the operator to operate, a detachable portion 323 where the drill bit is detachably attached, and a case 324.

[0024] The case 324 houses the motor 321 and is provided with an operation unit 322 and a detachable unit 323, and has a shape that can be gripped by an operator. The operation unit 322 is a switch, and for example, it may be any type that rotates the motor 321 only while the operator continues to press the operation. The detachable unit 323 is configured to be detachable in a one-touch manner for drill bits with different diameters, and has a polygonal cylindrical mounting recess through which the connection part of the drill bit can be inserted, and is capable of transmitting rotation. That is, the electric drill main body 32 is a general-purpose device that can directly connect the drill bit.

[0025] The extension part 33 is formed in a cylindrical or columnar shape that extends in a predetermined direction as a whole, has a motor-side connection part 331 at one end, and a drill-side connection part 332 at the other end. The outer diameter of the extension part 33 may be equal to or less than that of the drill part 31, that is, it may be a size that can be inserted into the metal pipe 100. The motor-side connection part 331 is formed in a polygonal columnar shape in the same manner as the connection part of a normal drill bit and is capable of transmitting rotation, and can be connected to the detachable unit 323 of the electric drill main body 32. That is, the motor-side connection part 331 can be connected to the motor 321. At this time, "connected to the motor 321" means that the rotation of the motor 321 is transmitted, and it includes not only a directly connected form but also a form connected via other parts.

[0026] The drill-side connection part 332 has a polygonal cylindrical mounting recess in the same manner as the detachable unit 323 and is capable of transmitting rotation, and the drill bit (especially the drill part 31) can be connected. At this time, it is preferable that the connection structure is such that the outer diameter of the drill-side connection part 332 does not become larger than the outer diameters of the drill part 31 and the extension part 33. Specifically, a hole-shaped female thread part penetrating from the mounting recess to the outer peripheral surface of the extension part 33 is formed, a wood screw is screwed into this female thread part, and the connection part of the drill part 31 is pressed in the radial direction by the wood screw to prevent it from coming off.

[0027] In a state where the drill part 31, the electric drill main body 32, and the extension part 33 are connected, that is, in a state where the drill part 31 is connected to the electric drill main body 32 via the extension part 33, the drill part 31 and the extension part 33 extend along the direction of the rotation axis. When an operator operates the operation part 322, the motor 321 rotates, and thereby the extension part 33 and the drill part 31 also rotate. In this way, the rotation of the motor 321 is transmitted to the drill part 31 via the extension part 33. At this time, it is preferable to use the extension part 33 such that the total extension direction dimension of the drill part 31 and the extension part 33 is 50% or more of the extension direction dimension of the metal pipe 100.

[0028] Here, a bead removing method using the bead removing device 1 will be described. First, the metal pipe 100 is placed on the corner part 213 of the holding table 21 of the holding part 2. Next, a force in the Z - direction downward is applied to the shaft part 222 by the holding force applying part 22, and the metal pipe 100 is sandwiched and held by the plate parts 211, 212 and the elastic part 221.

[0029] While maintaining the state in which the metal pipe 100 is held by the holding part 2 as described above, the tip of the drill part 31 is aligned with one end opening 101 of the metal pipe 100, and the operation part 322 is operated to rotate the drill part 31 while inserting the drill part 31 into the end opening 101. At this time, the operator moves the electric drill main body 32 along the X - direction, and inserts the drill part 31 along the X - direction from the end opening 101 toward the central part 103 in the extension direction of the metal pipe 100 (removing step).

[0030] By performing welding on the metal pipe 100 as described above, a welded part 104 is formed as shown in FIG. 3. On the welded part 104, an inner surface bead 105 which is a bead protruding to the inner surface 100B side is formed. Note that the bead formed on the outer surface 100A may be appropriately removed from the outer surface 100A side.

[0031] In the removal process as described above, the inner bead 105 is scraped off and removed by the drill part 31 (Fig. 4). At this time, the range where the inner bead 105 is scraped off is from the end opening 101 to the range of the total extension direction dimension of the drill part 31 and the extension part 33. When the total extension direction dimension of the drill part 31 and the extension part 33 is less than the extension direction dimension of the metal pipe 100, similar to from one end opening 101, the drill part 31 is also inserted through the other end opening 102 to remove the inner bead 105. After the removal of the inner bead 105, the holding by the holding part 2 is released, and the metal pipe 100 is conveyed to the next process.

[0032] Thus, according to the bead removal device 1 according to the embodiment of the present invention, the inner bead 105 can be removed by the removal part 3. At this time, since the removal part 3 has the extension part 33, the inner bead 105 can be removed not only in the vicinity of the end openings 101 and 102 but also from the end openings 101 and 102 to the central part 103.

[0033] Further, since the holding part 2 has the holding base 21 that holds the metal pipe 100 inside the corner part 213 and the holding force applying part 22 that applies a force in the direction toward the corner part 213 to the metal pipe 100, the metal pipe 100 can be easily held, and it is possible to suppress the metal pipe 100 from moving when the inner bead 105 is removed. In particular, since the metal pipe 100 is held inside the corner part 213, it is easy to suppress the movement in the Y direction.

[0034] Note that the present invention is not limited to the form of the above embodiment, includes other configurations and the like that can achieve the object of the present invention, and deformations and the like as shown below are also included in the present invention. For example, in the above embodiment of the present invention, the holding part 2 is assumed to have the holding base 21 and the holding force applying part 22, but the configuration for holding the metal pipe is not limited to this, and the metal pipe may be tied with a band or the like, or held by sandwiching the metal pipe from the radial direction with a clamp. Further, when targeting a metal pipe with a predetermined outer diameter, it may be configured to place the metal pipe in a groove part or a hole part having an inner diameter similar to the outer diameter of the metal pipe and press it.

[0035] As described above, the embodiments of the present invention have been explained. However, the present invention is not limited to the bead removing device and the bead removing method according to the above embodiments of the present invention, and includes all aspects included in the concept of the present invention and the scope of the claims. Also, each configuration may be appropriately and selectively combined so as to achieve at least a part of the above-described problems and effects. For example, the shape, material, arrangement, size, etc. of each component in the above embodiment can be appropriately changed according to the specific usage mode of the present invention.

Explanation of Reference Numerals

[0036] 1... bead removing device, 2... holding part, 21... holding table, 211, 212... plate parts, 22... holding force applying part, 3... removing part, 31... drill part, 321... motor (rotary driving part), 322... operation part, 33... extension part, 100... metal pipe, 104... welding part, 105... inner bead, 101, 102... end openings, 103... central part

Claims

1. a holding part for holding a metal pipe having an inner bead formed on a welded part; a removing part for removing the inner bead from the metal pipe, the removing part comprising: a drill part for shaving off the inner bead; a rotational drive part for rotating the drill part; an operation part for rotating the rotational drive part by an operator's operation; and an extension part having one end connected to the drill part and the other end connected to the rotational drive part and extending along the direction of the rotation axis. A bead removing device characterized by this.

2. The holding part according to claim 1, characterized by comprising: a holding table for holding the metal pipe inside a corner formed between plate parts intersecting each other; and a holding force applying part for applying a force in a direction toward the corner to the metal pipe.

3. A bead removing method for removing the inner bead from the metal pipe using the bead removing device according to claim 1 or 2, characterized by including a removing step of inserting the drill part from an end opening of the metal pipe toward a central part while rotating the drill part in a state where the metal pipe is held by the holding part.

4. The bead removing method according to claim 3, characterized in that, in the removing step, the drill part is inserted into the metal pipe while rotating the drill part at a constant speed.

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