Cutting apparatus and cutting method

Abstract

The present invention provides a cutting apparatus and cutting method that can suppress defects in the appearance of metal pipes. [Solution] The cutting device 1 is a cutting device for cutting the bead 302 on the inner surface 301 of a metal pipe 300 in which the edges of metal plates 200 are welded together, and comprises an upper roller portion 3 that contacts the inner surface 301 on the upper side in the Z direction (vertical direction), a lower roller portion 6 that contacts the inner surface 301 on the lower side in the Z direction, and a cutting portion 4 that cuts the bead 302 on the upper side in the Z direction. The lower roller portion 6 has a pair of contact portions 612, 613 that contact the inner surface 301 while being spaced apart from each other so as to be located on both sides in the circumferential direction with respect to the lowest end portion 303 of the metal pipe 300.

Description

Technical Field

[0001] The present invention relates to a cutting device and a cutting method.

Background Art

[0002] Conventionally, a bead processing device for cutting beads on the inner surface of a steel pipe generated during the production of a welded steel pipe has been proposed (see, for example, Patent Document 1). In the bead processing device described in Patent Document 1, a one-way chopping mechanism using a link mechanism that converts vertical movement from a drive source into horizontal movement is adopted so as not to interfere with the arrangement of a tool, an upper roller, and a lower roller.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When cutting a bead on the inner surface of a metal pipe with a bead processing device as described in Patent Document 1, in order to prevent the cut bead (hereinafter referred to as "spatter") from staying at the welded part, it is necessary to perform cutting in a posture such that the welded part faces upward in the vertical direction. Also, during cutting, in order to press the cutting edge against the inner surface of the metal pipe, a roller provided on the lower side in the vertical direction may be brought into contact with the inner surface of the metal pipe. At this time, there was a risk that the spatter that had moved downward in the vertical direction due to gravity would be crushed by the roller, causing scratches or the like on the inner surface of the metal pipe. When the metal pipe is bent and used, for example, unevenness is likely to occur on the outer surface of the metal pipe due to the scratches, resulting in a possibility of poor appearance.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a cutting device and a cutting method capable of suppressing poor appearance of a metal pipe. [Means for solving the problem]

[0006] To achieve the above objective, the cutting apparatus according to the present invention is a cutting apparatus for cutting a bead on the inner surface of a metal pipe in which the edges of metal plates are welded together, and comprises an upper roller portion that contacts the inner surface on the vertically upper side, a lower roller portion that contacts the inner surface on the vertically lower side, and a cutting portion that cuts the bead on the vertically upper side, wherein the lower roller portion has a pair of contact portions that contact the inner surface while being spaced apart from each other so as to be located on both sides in the circumferential direction with respect to the lowest end of the metal pipe.

[0007] In one aspect of the present invention, the cutting apparatus has the pair of contact portions formed on a roller of one part.

[0008] To achieve the above objective, the cutting method according to the present invention is a cutting method for cutting the inner bead of a metal pipe in which the edges of metal plates are welded together, characterized in that the roller portion is brought into contact with the inner surface on the upper and lower vertical sides, and the cutting portion is brought into contact with the inner surface on the upper vertical side, while the metal pipe and the cutting portion are moved relative to each other in the extending direction of the metal pipe, and the roller portion on the lower vertical side is brought into contact with the inner surface at a pair of contact points spaced apart from each other so as to be located on both sides in the circumferential direction with respect to the lowest end of the metal pipe. [Effects of the Invention]

[0009] According to the cutting apparatus and cutting method of the present invention, defects in the appearance of metal pipes can be suppressed. [Brief explanation of the drawing]

[0010] [Figure 1] This is a schematic side view showing a metal pipe manufacturing apparatus equipped with a cutting device according to this embodiment. [Figure 2] This is a side view showing the cutting apparatus according to this embodiment. [Figure 3]This is a front view showing the cutting apparatus according to this embodiment. [Modes for carrying out the invention]

[0011] Embodiments of the present invention will be described below with reference to the drawings. Figure 1 is a schematic side view of a metal pipe manufacturing apparatus 100 equipped with the cutting device 1 according to this embodiment, Figure 2 is a side view of the cutting device 1, and Figure 3 is a front view of the cutting device 1.

[0012] A cutting device 1 according to an embodiment of the present invention is a cutting device for cutting a bead 302 on the inner surface 301 of a metal pipe 300 in which the edges of metal plates 200 are welded together, and comprises an upper roller portion 3 that contacts the inner surface 301 on the upper side in the Z direction (vertical direction), a lower roller portion 6 that contacts the inner surface 301 on the lower side in the Z direction, and a cutting portion 4 that cuts the bead 302 on the upper side in the Z direction. The lower roller portion 6 has a pair of contact portions 612, 613 that contact the inner surface 301 while being spaced apart from each other so as to be located on both sides in the circumferential direction with respect to the lowest end portion 303 of the metal pipe 300. The cutting device 1 will be described in detail below.

[0013] The cutting device 1 is used in the metal pipe manufacturing apparatus 100. The metal pipe manufacturing apparatus 100 includes a pipe forming section 101 that bends a metal plate 200 and welds its edges together, a conveying means (not shown) that conveys the metal plate 200 and the metal pipe 300 in a predetermined direction, and a removal means (not shown) that removes the bead from the outer surface of the metal pipe 300, thereby manufacturing a metal pipe 300 from a metal plate 200. In the metal pipe manufacturing apparatus 100, the edges of the metal plate 200 that are welded to each other face upward in the vertical direction, that is, the metal pipe 300 is manufactured so that the welded portion faces upward in the vertical direction. The material of the metal plate 200 and the metal pipe 300 and the specific welding method are not particularly limited, and the cutting device 1 should be used under conditions where a bead 302 can be formed on the inner surface of the metal pipe 300 by welding.

[0014] In the following, the vertical direction will be referred to as the Z direction, the horizontal plane as the XY plane, and the up and down directions in the Z direction will simply be referred to as up and down. Also, the conveying direction of the conveying means of the metal pipe manufacturing apparatus 100 will be referred to as the X direction, and the upstream and downstream sides in the X direction will simply be referred to as the upstream side and the downstream side.

[0015] The cutting device 1 comprises a first component 10, a second component 20, and a biasing means (not shown) provided between the first component and the second component. The first component 10 has a recess 10A on its lower side, and a biasing means such as a spring is provided in this recess 10A, and the second component 20 is attached to the recess 10A. The biasing force of the biasing means acts to separate the first component 10 and the second component 20 in the Z direction.

[0016] The first component 10 includes an upper main body 2, an upper roller 3, and a cutting section 4.

[0017] The upper roller section 3 is composed of two rollers 31 spaced apart in the X direction. The rollers 31 are supported by the upper main body section 2 with the Y direction as the axis of rotation. The outer circumferential surface 311 of the rollers 31 contacts the inner surface 301 of the metal pipe 300 on the upper side in the Z direction. The outer circumferential surface 311 may be formed in an arc shape along the inner surface 301 of the metal pipe 300 when viewed from the X direction, or it may be formed in a concave shape to avoid the bead 302 of the inner surface 301. It's fine if you do that.

[0018] The cutting section 4 is a cutting blade that cuts the bead 302 on the upper side in the Z direction and is positioned downstream of the two rollers 31. The shape and material of the cutting section 4 are not particularly limited and can be appropriately chosen depending on the material and welding method of the metal pipe 300.

[0019] The second component 20 has a lower main body 5 and a lower roller section 6. The lower roller section 6 is composed of two rollers 61 spaced apart in the X direction. The rollers 61 are supported by the lower main body 5 with the Y direction as the axis of rotation. The two rollers 61 have similar shapes.

[0020] The outer peripheral surface 611 of the roller 61 contacts the inner surface 301 of the metal pipe 300 on the lower side in the Z direction. The outer peripheral surface 611 has a pair of contact portions 612 and 613 that contact the inner surface 301 while being spaced apart from each other so as to be located on both circumferential sides with respect to the lowermost end portion 303 of the metal pipe 300, and a recess 614 formed between the pair of contact portions 612 and 613.

[0021] The pair of contact portions 612 and 613 are each formed in an arc shape along the inner surface 301 of the metal pipe 300 when viewed from the X direction, and have a predetermined contact area and contact in a planar manner. The recess 614 is separated from the inner surface 301 and does not contact. Thus, in the present embodiment, the pair of contact portions 612 and 613 are formed on the single-component roller 61.

[0022] Next, a method for cutting the bead 302 using the cutting device 1 will be described. The cutting device 1 is supported from the upstream side in the metal pipe manufacturing device 100 and is located inside the metal pipe 300. That is, the cutting device 1 is supported in a cantilevered manner by a support means suspended from above at a position where the transition from the metal plate 200 to the metal pipe 300 occurs. The cutting device 1 disposed inside the metal pipe 300 is pressed against the inner surface 301 by a biasing means, with the upper roller portion 3 and the cutting portion 4 being pressed against the inner surface 301 and the lower roller portion 6 being pressed against the inner surface 301.

[0023] The cutting device 1 is disposed on the downstream side of the pipe forming portion 101 and cuts the bead 302 formed by welding. At this time, the roller portions 3 and 6 contact the inner surface 301 on the upper side and the lower side in the Z direction, and the cutting portion 4 contacts the inner surface 301 on the upper side in the Z direction. Further, since the metal pipe 300 moves in the X direction and the cutting device 1 is fixed, the metal pipe 300 and the cutting device 1 relatively move in the X direction (the extending direction of the metal pipe 300). Also, the contact portions 612 and 613 of the lower roller portion 6 contact the inner surface 301, so that the lower roller portion 6 contacts the inner surface 301 at a pair of contact locations spaced apart from each other so as to be located on both circumferential sides with respect to the lowermost end portion 303 of the metal pipe 300.

[0024] Since the bead 302 is formed on the upper side in the Z direction, when the bead 302 is cut by the cutting device 1, the cut spatter falls due to gravity and accumulates on the lower side inside the metal pipe 300. The lower roller portion 6 contacts the inner surface 301 on the lower side in the Z direction, but the pair of contact portions 612 and 613 are spaced apart so that they are located on both sides in the circumferential direction relative to the lowest end portion 303, thereby preventing spatter from being removed.

[0025] As described above, according to the cutting apparatus 1 according to the embodiment of the present invention, the lower roller portion 6 has a pair of contact portions 612 and 613 that contact the inner surface 301 of the metal pipe 300 while being spaced apart from each other so as to be located on both sides in the circumferential direction with respect to the lowest end portion 303 of the metal pipe 300. This allows the lower roller portion 6 to avoid spatter and prevent the spatter from being crushed. This suppresses the occurrence of scratches and other damage on the inner surface 301 of the metal pipe 300, and, for example, when the metal pipe 300 is used in a bent state, it makes it less likely for irregularities to occur on the outer surface of the metal pipe 300, thereby suppressing defects in appearance.

[0026] Furthermore, since a pair of contact portions 612 and 613 are formed on the roller 61 of a single component, an increase in the number of components can be suppressed.

[0027] Furthermore, the present invention is not limited to the embodiments described above, and includes other configurations that can achieve the objectives of the present invention, including the following modifications. For example, in the above embodiments of the present invention, a pair of contact portions 612 and 613 are formed on a single roller 61, but the roller on which one of the contact portions is formed and the roller on which the other is formed may be separate parts. In such a configuration, there is no need to form a recess, and the pair of contact portions can be easily provided.

[0028] Although embodiments of the present invention have been described above, the present invention is not limited to the cutting apparatus according to the embodiments of the present invention described above, but includes all embodiments included in the concept and claims of the present invention. Furthermore, each configuration may be selectively combined as appropriate to achieve at least some of the above-described problems and effects. For example, the shape, material, arrangement, size, etc., of each component subject to calculation in the above embodiments may be appropriately changed depending on the specific use of the present invention. [Explanation of symbols]

[0029] 1...Cutting device, 3...Upper roller section, 4...Cutting section, 6...Lower roller section, 612, 613...Contact section, 200...Metal plate, 300...Metal pipe, 301...Inner surface, 302...Bead, 303...Lowest end

Claims

1. A cutting device for cutting the bead on the inner surface of a metal pipe in which the edges of metal plates are welded together, An upper roller portion that contacts the inner surface on the vertically upward side, A lower roller portion that contacts the inner surface on the vertically downward side, It comprises a cutting section for cutting the bead on the vertically upward side, The cutting apparatus is characterized in that the lower roller portion has a pair of contact portions that contact the inner surface of the metal pipe, spaced apart from each other and positioned on both sides in the circumferential direction relative to the lowest end of the metal pipe.

2. The cutting apparatus according to claim 1, characterized in that the pair of contact portions are formed on a roller of one component.

3. A cutting method for cutting the inner bead of a metal pipe in which the edges of metal plates are welded together, The roller portion is brought into contact with the inner surface on the vertically upper and vertically lower sides, and the cutting portion is brought into contact with the inner surface on the vertically upper side, while the metal pipe and the cutting portion are moved relative to each other in the direction of extension of the metal pipe. A cutting method characterized by bringing the lower vertical roller portion into contact with the inner surface at a pair of contact points spaced apart from each other so as to be located on both sides in the circumferential direction with respect to the lowest end of the metal pipe.

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