Manufacturing apparatus and method for welding joint components

Abstract

The present invention provides a manufacturing apparatus for welding joint components that can efficiently produce welding joint components in a small space. [Solution] The manufacturing apparatus 1 for welding joint members includes a forming device 20 that cuts a metal material 100 supplied from a supply device 10 while it is in contact with a contact portion 70, and also curves the cut metal material 100 into an arc shape. The forming device 20 includes a support 30 and a movable body 40, and by bringing the movable body 40 closer to the support 30, pressing by a pressing portion 42 and cutting by a cutting portion 43 are performed at different locations on the metal material 100, and press forming of the cut metal material 100 is performed by an upper mold portion 44.

Description

Technical Field

[0001] The present invention relates to an apparatus and a method for manufacturing a member for a welding joint used for butt welding a bar material such as a reinforcing bar.

Background Art

[0002] As a conventional method for manufacturing a member for a welding joint, Patent Document 1 discloses a material feeding step of intermittently feeding a long metal material having groove portions continuously formed in the longitudinal direction on the surface, and a surface of the fed metal material. A pressing step of forming flat portions at regular intervals on the surface of the metal material by pressing and disappearing a part of the groove portion, a cutting step of cutting the metal material at the flat portion, and a bending step of bending the cut metal material into an arc shape are disclosed.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] While the manufacturing method of the member for a welding joint disclosed in the above Patent Document 1 can perform the pressing step and the cutting step simultaneously at different positions of the metal material by a press, since the bending step is performed by another press, there is a problem that the installation space of the entire apparatus becomes excessive. Further, in the material feeding step, when a long metal material wound in a roll is fed and used, there is a problem that the installation space of the metal material also tends to become excessive.

[0005] Therefore, an object of the present invention is to provide an apparatus and a method for manufacturing a member for a welding joint that can efficiently manufacture the member for a welding joint in a small space.

Means for Solving the Problems

[0006] The object of the present invention is a supply device for continuously supplying a plurality of metal materials of a predetermined length, each having a groove extending in the longitudinal direction; a contact portion against which the end of the metal material supplied from the supply device abuts; and a molding device for cutting the metal material supplied from the supply device while it is in contact with the contact portion, and for curving the cut metal material into an arc shape, wherein the molding device comprises a support and a movable body provided to be able to move toward and away from the support, the support comprising a base for supporting the metal material, a lower mold for supporting the cut metal material, and the cut metal material This is achieved by a manufacturing apparatus for welding joint members, which includes a conveying device for moving the material to the lower die, and the movable body comprises a pressing part that presses the metal material supported on the support base to form a flat portion, a cutting part that cuts the flat portion of the metal material, and an upper die part that press-forms the cut metal material between itself and the lower die after it has been moved by the conveying device, and by bringing the movable body closer to the support, pressing by the pressing part and cutting by the cutting part are performed at different locations on the metal material, and press-forming of the cut metal material by the upper die part is performed.

[0007] In this manufacturing apparatus for welding joint members, it is preferable that the contact portion is reciprocable between a contact position and a reference position along the supply direction of the metal material, and when the leading edge of the metal material before cutting reaches the vicinity of the cutting portion, it is preferable to move the contact portion from the contact position to the reference position to push the metal material back, thereby aligning the metal material with respect to the cutting portion.

[0008] Preferably, the lower mold comprises a curved molding surface, an ejector pin that can extend and retract relative to the molding surface, and a biasing member that biases the ejector pin to protrude from the molding surface.

[0009] Furthermore, the above-mentioned object of the present invention is achieved by a method for manufacturing a welded joint member using the above-described manufacturing apparatus for welded joint members, comprising a supply step of supplying a plurality of metal materials of a predetermined length, each having a groove extending in the longitudinal direction, in succession using the supply device and bringing the ends into contact with the contact portion, and a forming step of cutting the metal material while it is in contact with the contact portion and curving the cut metal material into an arc shape. [Effects of the Invention]

[0010] According to the manufacturing apparatus and manufacturing method for welded joint components of the present invention, welded joint components can be manufactured efficiently in a small space. [Brief explanation of the drawing]

[0011] [Figure 1] This is a schematic diagram of a manufacturing apparatus for welding joint components according to one embodiment of the present invention. [Figure 2] Figure 1 is a plan view showing the main parts of the manufacturing apparatus for welded joint components. [Figure 3] This is a plan view showing other key parts of the manufacturing apparatus for welded joint components shown in Figure 1. [Figure 4] Figure 3 is a cross-sectional view of the main part. [Figure 5] Figure 1 is an operational process diagram of the manufacturing apparatus for welded joint components. [Figure 6] Figure 4 is an explanatory diagram of the operation. [Figure 7] Figure 3 is an explanatory diagram of the operation. [Modes for carrying out the invention]

[0012] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1 is a schematic diagram of a manufacturing apparatus for welding joint members according to one embodiment of the present invention. As shown in Figure 1, the manufacturing apparatus 1 for welding joint members mainly comprises a supply device 10 for supplying metal material 100, a contact portion 70 to which the end of the metal material 100 supplied from the supply device 10 abuts, and a forming device 20 that cuts the metal material 100 supplied from the supply device 10 while it is in contact with the contact portion 70 and curves the cut metal material 100 into an arc shape.

[0013] The supply device 10 intermittently supplies the metal material 100, supported by the support roller 11, towards the molding device 20 in the direction indicated by the arrow by driving a pair of feed rolls 13, 13, passing it between a pair of guide rolls 12, 12. The metal material 100 is made of steel material such as SS400 or SWRM and is formed in the shape of a straight strip plate having a predetermined length.

[0014] Figure 2 is a plan view of the supply device 10. As shown in Figure 2, a groove 100a extending in the longitudinal direction is formed in the center of the surface of the metal material 100, similar to the metal material disclosed in Patent Document 1. Multiple metal materials 100 are mounted in parallel on a conveying device 14 consisting of a chain conveyor and are conveyed toward the support roller 11 by the drive of the conveying device 14.

[0015] Above the conveying device 14, a stopper 16 is supported so as to be vertically movable and capable of engaging with the metal material 100 at a preset engagement position. By driving the conveying device 14 with the stopper 16 engaged with the metal material 100, a single metal material 100 located downstream in the conveying direction from the engagement position of the stopper 16 is mounted on the support roller 11.

[0016] The metal material 100 mounted on the support roller 11 is held by the guide member 17, which is provided to be able to move up and down, and is pushed toward the guide roll 12 in a direction perpendicular to the conveying direction of the conveying device 14 by the drive of the slider 15a of the pushing device 15.

[0017] The supply of the metal material 100 to the support roller 11 by the drive of the conveying device 14 is performed at the timing when the rear end of another metal material 100 previously supplied passes near the photoelectric sensor 18. By pushing the metal material 100 by the pushing device 15, the front end of the supplied metal material 100 abuts against the rear end of another metal material 100 being conveyed forward. Thus, the metal materials 100 are supplied in a single row toward the molding device 20 in a state where a plurality of them are continuous.

[0018] As shown in FIG. 1, the molding device 20 includes a support 30 and a movable body 40 provided so as to be able to approach and separate from the support 30.

[0019] The support 30 includes a cradle 31 that supports the metal material 100 supplied from the supply device 10, a lower mold 50 that supports the cut metal material 100, and a conveying device 60 that moves the cut metal material 100 to the lower mold 50.

[0020] The movable body 40 includes a block-shaped main body 41 supported so as to be able to move up and down above the cradle 31 and the lower mold 50, and a pressing portion 42, a cutting portion 43, and an upper mold portion 44 provided on the lower surface side of the main body 41.

[0021] The pressing portion 42 is formed in a convex shape downward from the lower surface of the main body 41. By pushing down the main body 41, the metal material 100 supported by the cradle 31 is pressed to form a flat portion, and the groove portion formed in the metal material 100 disappears.

[0022] The cutting portion 43 is provided on the downstream side in the supply direction of the metal material 100 with respect to the pressing portion 42. By pushing down the main body 41, the metal material 100 is cut at the flat portion previously formed by the pressing portion 42. The pressing by the pressing portion 42 and the cutting by the cutting portion 43 are performed simultaneously at different locations of the metal material 100 by pushing down the main body 41. Note that the cradle 31 is provided with a marking member (not shown) similar to the cradle disclosed in Patent Document 1, and a marking portion can be formed on the metal material 100 by pushing down the main body 41.

[0023] The upper mold section 44 is positioned directly above the lower mold 50, and press-forms the cut metal material 100 between it and the lower mold 50.

[0024] Figure 3 is a plan view of the lower mold 50 and the conveying device 60, and Figure 4 is a cross-sectional view of the lower mold 50 shown in Figure 3. As shown in Figure 4, the lower mold 50 has a curved molding surface 53 formed on the main body 51, and a through hole 51a opening to the molding surface 53 is formed in the center of the main body 51. An ejector pin 56 is inserted into the through hole 51a so as to be able to move in and out of the molding surface 53. The main body 51 is supported by a base 55 which has a housing section 55a at a position corresponding to the through hole 51a, and a biasing member 57 that supports the ejector pin 56 is housed in the housing section 55a. The biasing member 57 is made of a coil spring or the like and biases the ejector pin 56 so that the upper part of the ejector pin 56 protrudes from the molding surface 53.

[0025] As shown in Figure 3, the conveying device 60 consists of a pusher equipped with a pressing section 61 that can move back and forth perpendicular to the metal material 100 along a horizontal plane. The cutting piece 101 made of the metal material 100 cut by the cutting section 43 is pressed by the advancing pressing section 61 and moved to the upper surface of the main body 51 of the lower die 50. The upper surface of the main body 51 is provided with locking pieces 52 that lock and hold both sides of the conveyed cutting piece 101.

[0026] As shown in Figure 1, the contact portion 70 is positioned downstream of the cutting portion 43 in the supply direction of the metal material 100, so that the tip of the metal material 100 contacts it. The contact portion 70 is attached to a linear drive device 71 such as a robot cylinder equipped with a guide rail 72, and is supported so as to be able to reciprocate in the direction indicated by the arrow between the contact position and a reference position, which will be described later, along the supply direction of the metal material 100. The contact portion 70 is provided with a contact sensor (not shown), which, after detecting contact with the metal material 100, pushes down the main body 41 of the movable body 40, thereby pressing and cutting the metal material 100 while it is in contact with the contact portion 70.

[0027] A method for manufacturing a welded joint member using the manufacturing apparatus 1 having the above configuration comprises a supply step of supplying multiple metal material 100 of a predetermined length, each having a longitudinally extending groove 100a formed therein, in a continuous manner using a supply device 10, so that the leading edge of the metal material 100 comes into contact with the contact portion 70; and a forming step of operating a forming device 20 while the metal material 100 is in contact with the contact portion 70, thereby cutting the metal material 100 and curving the cut metal material 100 into an arc shape.

[0028] Figure 5 is an operation diagram illustrating the details of the molding process by the molding apparatus 20. As shown in Figure 5(a), the molding apparatus 20 pushes down the main body 41 of the movable body 40 in the direction of the arrow while the tip of the metal material 100 is in contact with the contact portion 70 at the contact position. As shown in Figure 5(b), the pressing portion 42 presses the metal material 100 to form a flat portion 100b on the metal material 100, and at the same time, the cutting portion 43 cuts the metal material 100 at the pre-formed flat portion 100b. As a result, the cut pieces 101 of the metal material 100 fall and are placed on the mounting table 39. The contact position of the contact portion 70 is set so that the metal material 100 is divided into approximately equal parts and cut pieces 101 of a predetermined length are obtained.

[0029] The feed of the metal material 100 by the pair of feed rolls 13, 13 is performed intermittently at regular intervals so that after cutting the metal material 100, the leading edge of the metal material 100 supported by the support base 31 comes into contact with the contact portion 70, enabling the next cut. However, as shown in Figure 5(c), the last part of the metal material 100 shown in Figure 5(b) is simply fed out without cutting the metal material 100 to obtain a piece equivalent to the cut piece 101. Therefore, by waiting for a time equivalent to the cutting time of the metal material 100 before feeding out the metal material 100, the supply interval of the cut pieces 101 toward the lower die 50, which will be described later, can be kept constant.

[0030] As shown in Figure 5(c), when the last portion of the metal material 100 falls onto the mounting table 39 and the tip 100c of the next supplied uncut metal material 100 reaches the vicinity of the cutting section 43, as shown in Figure 5(d), the contact portion 70 moves from the contact position to the reference position, pressing the tip 100c of the metal material 100 and pushing it back to the reference position. After this alignment process of the metal material 100 with respect to the cutting section 43 is completed, the molding process of the metal material 100 can be continued by moving the contact portion 70 again from the reference position to the contact position, as shown in Figure 5(a). It is preferable that the position of the tip 100c of the metal material 100 shown in Figure 5(c) protrudes slightly towards the contact position from the reference position so that the contact portion 70 can reliably push the tip 100c of the metal material 100 back to the reference position.

[0031] In this way, when the tip 100c of the metal material 100 before cutting reaches the vicinity of the cutting section 70, the contact section 70 is moved from the contact position to the reference position to push the metal material 100 back, thereby aligning the metal material 100 with respect to the cutting section 43. This reliably prevents the accumulation of dimensional errors when cutting multiple metal materials 100 in succession, and suppresses waste loss of metal materials 100 and a decrease in the yield of welding joint members 102.

[0032] As shown in Figure 3, in the molding process described above, the formation of a flat portion 100b on the metal material 100 by the pressing portion 42 and the cutting portion 43 cutting the metal material 100 at the flat portion 100b are performed simultaneously with press molding by the upper die portion 44 on the cut piece 101 that has been transferred to the lower die portion 50 after cutting.

[0033] As shown in Figure 6(a), in press forming, the cut piece conveyed to the upper surface of the main body 51 of the lower die 50 is curved along the molding surface 53 by the pressure of the upper die portion 44, thereby forming the welding joint member 102. The ejection pin 56 is embedded below the molding surface 53 as the upper die portion 44 descends, but when the upper die portion 44 rises thereafter, as shown in Figure 6(b), the biasing force of the biasing member 57 causes the ejection pin 56 to push the welding joint member 102 up from the molding surface 53. It is preferable to place an engaging portion 54 above the lower die 50 that engages with the upper end of the welding joint member 102 pushed up by the biasing member 57, thereby maintaining a constant push-up height of the welding joint member 102.

[0034] As shown in Figure 7, after the formation of the welded joint member 102, the pressing section 61 of the conveying device 60 is advanced in the direction of the arrow, causing the cut piece 101 to move to the lower die 50. This cut piece 101 pushes the welded joint member 102 out of the lower die 50, causing it to fall into the discharge chute 59 which is inclined diagonally downward. Simultaneously, the metal material 100 is supplied in the direction of the arrow, causing the leading edge of the metal material 100 to pass above the pressing section 61 and come into contact with the contact section 70. After this, the pressing section 61 is retracted to its original position, and the above forming process is performed, allowing for the continuous manufacturing of the welded joint member 102.

[0035] Thus, the manufacturing apparatus 1 for welded joint components of this embodiment can perform pressing, cutting, and press forming of the metal material 100 simultaneously by operating the forming apparatus 20, allowing for the efficient manufacturing of welded joint components in a small space. [Explanation of symbols]

[0036] 1. Manufacturing apparatus for welding joint components 10 Feeding device 20 Molding equipment 30 Support 31 Support stand 40 Movable body 42 Pressing part 43 Cut section 44 Upper mold section 50 Lower mold 60 Conveying device 70 Contact part 100 Metal Materials 102 Components for welded joints

Claims

1. The apparatus comprises a supply device for continuously supplying multiple metal materials of a predetermined length, each having a groove extending in the longitudinal direction; a contact portion against which the ends of the metal materials supplied from the supply device abut; and a forming device for cutting the metal materials supplied from the supply device while they are in contact with the contact portion, and for curving the cut metal materials into an arc shape. The molding apparatus comprises a support and a movable body that is provided to be able to move toward and away from the support, The support comprises a base for supporting the metal material, a lower die for supporting the cut metal material, and a conveying device for moving the cut metal material to the lower die. The movable body comprises a pressing section that presses the metal material supported on the support base to form a flat portion, a cutting section that cuts the flat portion of the metal material, and an upper die section that press-forms the cut metal material between itself and the lower die after it has been moved by the conveying device. A manufacturing apparatus for welding joint members, which brings the movable body closer to the support, thereby performing pressing by the pressing part and cutting by the cutting part at different locations on the metal material, and press forming of the cut metal material by the upper die part.

2. The manufacturing apparatus for a welding joint member according to claim 1, wherein the contact portion is reciprocable between a contact position and a reference position along the supply direction of the metal material, and when the leading edge of the metal material before cutting reaches the vicinity of the cutting portion, the contact portion is moved from the contact position to the reference position to push the metal material back, thereby aligning the metal material with respect to the cutting portion.

3. The apparatus for manufacturing a welding joint member according to claim 1, wherein the lower mold comprises a curved molding surface, an ejector pin that can extend in and out of the molding surface, and a biasing member that biases the ejector pin to protrude from the molding surface.

4. A method for manufacturing a welded joint member using the manufacturing apparatus for welded joint members described in any one of claims 1 to 3, A method for manufacturing a welding joint member, comprising: a supply step of supplying a predetermined length of metal material having longitudinally extending grooves formed therein in a plurality of continuous portions using the supply device and bringing the ends into contact with the contact portion; and a forming step of cutting the metal material while it is in contact with the contact portion and curving the cut metal material into an arc shape.

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