Clamp device, clamp head, and manufacturing method of workpiece

Abstract

To provide a clamp device that efficiently fixes an object to be processed.SOLUTION: A clamp device includes a magnet base 10 and a clamp mechanism 30. The clamp mechanism 30 is held in the magnet base 10. The clamp mechanism 30 includes a clamp head 40 that presses an object to be processed and fixes a posture of the object to be processed. The clamp head 40 includes a base part 41, two press plates 43, and a recess 45. The press plates 43 are provided so as to be erected with respect to a lower surface of the base part 41. The recess 45 is provided in each end surface of the two press plates 43 and presses the object to be processed. The recess 45 includes at least one of a plurality of steps 45A and a plurality of corner parts 45B provided such that a depth of the recess 45 becomes deeper from the outside to the inside of the recess 45.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a clamping device, a clamping head, and a method for manufacturing a workpiece. [Background technology]

[0002] The welding process is performed with the workpieces fixed to a surface plate. For example, Patent Document 1 discloses a work surface plate having clamps for fixing the workpieces and a matrix of mounting holes for fixing the clamp supports. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-23196 Summary of the Invention [Problem to be solved by the invention]

[0004] To achieve high-quality welding, it is necessary to properly secure the workpieces to be welded according to the shape, size, position, and other characteristics of the welded area. However, on a surface plate with a matrix of mounting holes, the positions at which clamping devices for securing the workpieces to be welded can be installed are scattered. This creates limitations on securing the workpieces to be welded in positions and conditions that make welding easy, hindering improvements in the work efficiency of the welding process.

[0005] In order to solve the above-mentioned problems, the present disclosure aims to provide a clamping device that can efficiently fix a workpiece. [Means for solving the problem]

[0006] A clamping device according to the present disclosure includes a magnet base and a clamping mechanism. The clamping mechanism is held by the magnet base. The clamping mechanism includes a clamping head that presses against the workpiece to fix its position. The clamping head includes a base, two pressure plates, and a recess. The two pressure plates are provided upright relative to the underside of the base. The recess is provided on the end surface of each of the two pressure plates and presses against the workpiece. The recess includes at least one of a plurality of steps and a plurality of corners that are provided so that the depth of the recess increases from the outside to the inside of the recess. [Effects of the Invention]

[0007] According to the present disclosure, a clamping device is provided that efficiently secures a workpiece.

[0008] The objects, features and advantages of the present disclosure will become apparent from the following detailed description and the accompanying drawings. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view showing a configuration of a clamping device according to a first embodiment. [Figure 2] FIG. 2 is a perspective view showing the configuration of a clamp head. [Figure 3] 3 is a flowchart showing a method for manufacturing a welded product in the first embodiment. [Figure 4] 1A and 1B are diagrams showing the configuration of a clamping device and an object to be welded in a method for manufacturing a welded product. [Figure 5] 10A and 10B are diagrams showing a state in which the workpieces to be welded are fixed by a clamp head. [Figure 6] 10A and 10B are diagrams showing a state in which the workpieces to be welded are fixed by a clamp head. [Figure 7] 10A and 10B are diagrams showing a state in which the workpieces to be welded are fixed by a clamp head. [Figure 8] 10A and 10B are diagrams showing a state in which the workpieces to be welded are fixed by a clamp head. [Figure 9] 10A and 10B are diagrams showing a state in which the workpieces to be welded are fixed by a clamp head. [Figure 10] FIG. 10 is a perspective view showing the configuration of a clamp head in the second embodiment. [Figure 11] FIG. 4 is a front view showing the configuration of a first clamp head. [Figure 12] FIG. 10 is a front view showing the configuration of the second clamp head and the adapter. [Figure 13] 1A and 1B are diagrams showing the configuration of a clamping device and an object to be welded in a method for manufacturing a welded product. DETAILED DESCRIPTION OF THE INVENTION

[0010] <First Embodiment> 1 is a perspective view showing the configuration of a clamping device according to Embodiment 1. The clamping device includes a magnet base 10, a mounting plate 20, and a clamping mechanism 30.

[0011] The magnet base 10 has a switching means that can switch the magnetic attraction between an ON state and an OFF state. When the switching means is in the ON state, the magnet base 10 is attracted to a magnetic jig installation surface (not shown in FIG. 1).

[0012] The mounting plate 20 is provided on the upper surface of the magnet base 10. The mounting plate 20 in the first embodiment is provided so as to cover not only the upper surface of the magnet base 10 but also part of the side surface. The mounting plate 20 is made of a non-magnetic material. The mounting plate 20 is fastened to the magnet base 10 by, for example, screws 21 made of a non-magnetic material. The non-magnetic material forming the mounting plate 20 and screws 21 is, for example, a metal such as stainless steel or aluminum. The mounting plate 20 and screws 21 in the first embodiment are made of stainless steel.

[0013] The clamp mechanism 30 is held on the magnet base 10 via the mounting plate 20. The clamp mechanism 30 includes a support 31, a beam 32, a grip handle 33, and a clamp head 40.

[0014] The support pillar 31 is fixed to the mounting plate 20 and extends above the magnet base 10. In the first embodiment, the support pillar 31 is joined to the mounting plate 20 by welding, but the means for fixing the support pillar 31 is not limited to welding. The support pillar 31 is made of, for example, iron. The cross-sectional shape of the support pillar 31 is a flat H-shape with a narrowed center.

[0015] The beam 32 is supported by a support column 31 and extends laterally from the support column 31. A through-hole is provided at one end of the beam 32, and the support column 31 is inserted into the through-hole. A screw hole is provided at the other end of the beam 32, and a screw portion 33B of the grip handle 33 (described later) is screwed into the screw hole. A clamp head 40 is suspended from the other end of the beam 32 via the grip handle 33. The beam 32 tilts slightly due to the weight of the grip handle 33 and the clamp head 40. This tilt locks the beam 32 to the support column 31. When the other end of the beam 32 is lifted, the beam 32 is kept horizontal, and the lock is released. In this state, the beam 32 is movable up and down. That is, the beam 32 is provided so as to be movable along the support column 31. The beam 32 is made of, for example, iron.

[0016] The grip handle 33 includes a grip portion 33A and a screw portion 33B. The screw portion 33B is attached to the lower end of the grip portion 33A. The screw portion 33B is screwed into a threaded hole in the beam portion 32, thereby holding the grip handle 33 to the beam portion 32. Furthermore, as the grip portion 33A rotates, the grip handle 33 and the clamp head 40 move up and down.

[0017] The clamp head 40 has the function of pressing the workpiece to fix its position. Examples of the workpiece include parts to be machined, parts to be sheet metal processed, and parts to be joined. The workpiece is also called a workpiece. The position includes the position and inclination of the workpiece. Figure 2 is a perspective view showing the configuration of the clamp head 40. The clamp head 40 includes a base portion 41, a bearing portion 42, and two pressure plates 43. The base portion 41 is, for example, a plate-shaped member, but is not limited to this.

[0018] The bearing 42 is provided on the upper surface of the base 41. As shown in Fig. 1, the bearing 42 is coupled to the grip handle 33. The provision of the bearing 42 allows the clamp head 40 to rotate three-dimensionally within a predetermined angular range.

[0019] The two pressure plates 43 are provided upright against the underside of the base portion 41. The two pressure plates 43 are arranged parallel to each other. A space 44 is provided between the two pressure plates 43. The space 44 is open in the extension direction of the pressure plates 43. In other words, no parts connecting the two pressure plates 43 are provided between the two pressure plates 43 other than the base portion 41 or a member in contact with the base portion 41. The two pressure plates 43 are formed, for example, by bending both sides of one plate. The pressure plates 43 in the first embodiment are formed, for example, from a metal such as iron or stainless steel.

[0020] The end face of each pressure plate 43 is a contact portion that presses the workpiece while in contact with the workpiece. The pressing force applied from the end face of each pressure plate 43 to the workpiece is applied when the beam portion 32 moves downward along the support 31 or when the bearing portion 42 moves downward due to rotation of the grip handle 33. The end face of each pressure plate 43 is provided with a recess 45 and a claw portion 46 as a contact portion.

[0021] The recess 45 includes at least one of a plurality of steps 45A and a plurality of corners 45B. The step 45A includes a flat surface that is not inclined relative to the base portion 41. The corner 45B is formed, for example, at the connection point between two slopes with different inclination angles. Alternatively, the corner 45B includes a right angle formed at the end of the step 45A. The recess 45 of the first embodiment includes both the steps 45A and the corners 45B. The plurality of steps 45A or the plurality of corners 45B are provided so that the depth of the recess 45 increases from the outside to the inside of the recess 45. In the first embodiment, a V-shaped valley is provided in the center of the recess 45. The depth of the recess 45 is deepest at the center of the recess 45. The width of the recess 45 also decreases from the outside to the inside of the recess 45. Although not shown, the recess 45 is chamfered. In the first embodiment, the recesses 45 of the two pressing plates 43 have the same shape.

[0022] Next, a method for manufacturing a workpiece by processing a workpiece fixed by a clamping device will be described. Here, as an example, the workpiece is a workpiece to be welded, and a method for manufacturing a welded product by welding a welding point included in the workpiece to be welded will be described. FIG. 3 is a flowchart showing a method for manufacturing a welded product in the first embodiment. FIG. 4 is a diagram showing the configuration of a clamping device and workpiece 50 to be welded in the method for manufacturing a welded product. FIG. 5 is a diagram showing a state in which workpiece 50 to be welded is fixed by clamp head 40.

[0023] In step S1, the welding workpiece 50 is placed on the workpiece holding surface 51. In the first embodiment, the workpiece holding surface 51 is the upper surface of the welding surface plate 60.

[0024] In step S2, the magnet base 10 holding the clamping mechanism 30 is attracted to the jig installation surface 11. In the first embodiment, the jig installation surface 11 is the upper surface of the welding surface plate 60. That is, the jig installation surface 11 is the same surface as the workpiece holding surface 51. The upper surface of the welding surface plate 60 is formed of a magnetic metal such as iron. In step S2, the position of the magnet base 10 is first determined so that the clamp head 40 is located above the workpiece 50. After the magnet base 10 is placed in an appropriate position relative to the workpiece 50, the switching means of the magnet base 10 is switched from the OFF state to the ON state. This causes the magnet base 10 to be attracted to the upper surface of the welding surface plate 60. The order of steps S1 and S2 may be reversed. That is, the clamping device may be placed on the jig installation surface 11, and then the workpiece 50 may be placed below the clamp head 40.

[0025] In step S3, the recessed portion 45 of the clamp head 40 is brought into contact with the work-piece 50. At this time, after the beam portion 32 is moved downward, the angle of the clamp head 40 is adjusted so that the recessed portion 45 comes into contact with the work-piece 50. The angle of the clamp head 40 is adjusted by rotating the bearing portion 42. Here, as shown in FIG. 5, the step 45A and the claw portion 46 are in contact with the work-piece 50.

[0026] In step S4, the work-pieces 50 are pressed down to fix their positions. At this time, the clamp head 40 is pressed downward by rotating the grip handle 33. This causes the recesses 45 to press down on the work-pieces 50. The work-pieces 50 are clamped between the recesses 45 of the clamp head 40 and the upper surface of the welding platen 60, and the position of the work-pieces 50 is fixed.

[0027] In this way, in steps S3 and S4, the clamp head 40 presses the work-pieces 50 while the recesses 45 are in contact with the work-pieces 50. This fixes the position of the work-pieces 50. This pressure also reduces the gap at the welding point. For example, two members (not shown) located at the welding point of the work-pieces 50 come into contact with each other.

[0028] In step S5, the welding points of the workpiece 50 are welded using a welding machine (not shown). For example, welding is performed with the tip of the torch of the welding machine in contact with the workpiece 50. The welding machine is, for example, a fiber laser welding machine, but the type of welding machine is not limited to this. A welded product is manufactured through the above steps.

[0029] Next, a description will be given of another example of how the work-pieces 50 are fixed by the clamp head 40. Figures 6 to 9 are diagrams showing how the work-pieces 50 are fixed by the clamp head 40.

[0030] In FIG. 6 , the workpiece 50 has a configuration in which the plate protrudes in the vertical direction. The corner 45B of the recess 45 presses the workpiece 50 while contacting the end surface of the plate constituting the workpiece 50. Although not shown, the recess 45 of the other presser plate 43 also presses the workpiece 50 while contacting the end surface of the plate. That is, one corner 45B of one presser plate 43 and one corner 45B of the other presser plate 43 are in contact with the end surface of the plate constituting the workpiece 50. In addition, the bearing 42 has reached its maximum rotational angle and cannot rotate counterclockwise any further. In this state, the recess 45 of the clamp head 40 presses the workpiece 50. This fixes the position of the workpiece 50. Although the workpiece 50 shown in FIG. 6 has a shape that would cause it to fall over if not supported, the clamping device of the first embodiment can fix the workpiece 50 in an upright position.

[0031] In FIG. 7 , the recesses 45 of the two press plates 43 press the work-pieces 50 while contacting two sides of the work-pieces 50. In FIG. 8 , the recesses 45 of the clamp head 40 press and fix the work-pieces 50 while the ridges 52 of the work-pieces 50 are inserted into the spaces 44 between the two press plates 43. The recesses 45 may press and fix the work-pieces 50 while the tops 53 of the work-pieces 50 are inserted into the spaces 44. Alternatively, the recesses 45 may press and fix the work-pieces 50 while both the tops 53 and the ridges 52 are inserted into the spaces 44. The recesses 45 may also fix the work-pieces 50 while the curved portions (not shown) or spherical portions (not shown) of the work-pieces 50 are inserted into the spaces 44. In FIG. 9, claws 46 provided at both ends of recess 45 contact and press one surface of workpiece 50 to be welded.

[0032] In this way, the recess 45 of the clamp head 40 contacts and fixes at least two points within any component, such as a straight portion, a curved portion, a flat portion, or a curved surface, that makes up the work piece 50. The clamp device can press and fix various types of work pieces 50.

[0033] To summarize the above, the clamping device in embodiment 1 includes a magnet base 10 and a clamping mechanism 30. The clamping mechanism 30 is held by the magnet base 10. The clamping mechanism 30 includes a clamping head 40 that presses against the workpiece to fix its posture. The clamping head 40 includes a base 41, two pressure plates 43, and a recess 45. The two pressure plates 43 are provided upright on the underside of the base 41. The recess 45 is provided on the end surface of each of the two pressure plates 43 and presses against the workpiece. The recess 45 includes at least one of a plurality of steps 45A and a plurality of corners 45B that are provided so that the depth of the recess 45 increases from the outside to the inside of the recess 45.

[0034] Such a clamping device allows a worker to easily fix a workpiece in a position and in a state that makes it easy to perform the processing work. In other words, the clamping device allows a workpiece to be efficiently fixed. In the first embodiment, an example of a clamping device used in welding processing is shown, but this clamping device can also be applied to machining, sheet metal processing, etc. Such a clamping device improves productivity in the processing of workpieces.

[0035] Furthermore, the clamping device of the first embodiment properly brings two members of the work-piece 50 into contact with each other and fixes them together, thereby realizing a welding process that does not require tack welding before main welding.

[0036] The same effect as above can be obtained even when only multiple corners 45B are provided in the recess 45. Alternatively, only the step 45A may be formed among the step 45A and the corners 45B, such as when a curved portion is formed at the end of the step 45A instead of a right angle. Even in such a case, the same effect as above can be obtained. When both multiple steps 45A and multiple corners 45B are provided as in the first embodiment, it is possible to fix the workpieces 50 having a wider variety of shapes. Furthermore, the shapes of the recesses 45 of the two presser plates 43 may be the same or different from each other.

[0037] The clamping device is fixed in position by the magnet base 10, and can therefore be placed anywhere within the jig installation surface 11. For example, the clamping device is placed at an appropriate position depending on the type of the workpiece 50 to be welded.

[0038] Since the clamp device is fixed to the welding surface plate 60 by the magnet base 10, the position of the workpiece 50 is fixed simply by the clamp device pressing the workpiece 50 from above downward.

[0039] Because the mounting plate 20 is made of a non-magnetic material, the magnetic force of the magnet base 10 is less likely to be affected by the clamping mechanism 30 provided above the magnet base 10. In other words, even if the members constituting the clamping mechanism 30 are made of a magnetic material, the attractive force of the magnet base 10 is less likely to decrease.

[0040] Since the mounting plate 20 covers a portion of the side surface of the magnet base 10, the posture of the clamp mechanism 30 provided above the mounting plate 20 is stabilized. The mounting plate 20 may cover the entire side surface of the magnet base 10. In other words, it is sufficient that the mounting plate 20 covers at least a portion of the side surface of the magnet base 10.

[0041] The clamping mechanism 30 may be a toggle clamp. If the toggle clamp is held by the magnet base 10 and has the clamping head 40, a similar effect can be achieved.

[0042] The jig installation surface 11 on which the clamping device is installed and the object holding surface 51 on which the welding workpiece 50 is held may be different. For example, the jig installation surface 11 may be the upper surface of a surface plate, and the object holding surface 51 may be the ground or a surface of an iron plate other than the surface plate.

[0043] When the jig installation surface 11 on which the clamping device is installed is the upper surface of the welding surface plate 60, the upper surface may be a flat surface with no holes formed therein, or a surface with a plurality of holes formed in a matrix pattern. The shape of the jig installation surface 11 is not important as long as it is a surface to which the magnetic base 10 can be stably attached. For example, the jig installation surface 11 may be one surface of a magnetic metal block.

[0044] The material forming the presser plate 43 is not limited to metal, and may be formed of an elastic body. When the presser plate 43 is formed of metal, the metal may be exposed from the end face of the presser plate 43, or a cover formed of an elastic body may be provided on the end face of the presser plate 43. When the presser plate 43 is formed of metal, the workpiece is stably fixed.

[0045] <Embodiment 2> Fig. 10 is a perspective view showing the configuration of clamp head 140 in embodiment 2. Clamp head 140 includes first clamp head 40A, second clamp head 40B, and adapter 40C. Fig. 11 is a front view showing the configuration of first clamp head 40A. Fig. 12 is a front view showing the configuration of second clamp head 40B and adapter 40C.

[0046] The first clamp head 40A includes a pad portion 47 and a bearing portion 42. The pad portion 47 is configured to be detachable from an adapter 40C, which will be described later. The pad portion 47 can press against the workpiece when removed from the adapter 40C. The pressing force is applied when the beam portion 32 moves downward along the support 31, or when the bearing portion 42 moves downward by rotating the threaded portion 33B of the grip handle 33. The pad portion 47 in the second embodiment has a flat plate shape and is made of metal.

[0047] Second clamp head 40B includes a base portion 41 and two pressure plates 43. The configurations of base portion 41 and pressure plates 43 are the same as those in embodiment 1. Second clamp head 40B is held by first clamp head 40A when first clamp head 40A is attached to adapter 40C.

[0048] The adaptor 40C is provided on the upper surface of the base portion 41. The adaptor 40C is configured so that the first clamp head 40A can be attached and detached. For example, the adaptor 40C includes a groove. The pad portion 47 of the first clamp head 40A is inserted into the groove.

[0049] 3, when first clamp head 40A is removed from adapter 40C, pad portion 47 of first clamp head 40A presses against work-piece 50. When first clamp head 40A is attached to adapter 40C, second clamp head 40B is held by first clamp head 40A, and second clamp head 40B presses against work-piece 50.

[0050] The shape of the pad portion 47 of the first clamp head 40A is not limited to a flat plate. The provision of the adapter 40C makes it possible, for example, to attach the second clamp head 40B to an existing first clamp head 40A. Alternatively, if multiple second clamp heads with different recess 45 shapes are prepared, it becomes possible to attach an appropriate second clamp head 40B from among the multiple second clamp heads depending on the workpiece. Furthermore, as described above, the first clamp head 40A detached from the adapter 40C can be used to press and fix the workpiece.

[0051] <Third Embodiment> The recess 45 in the third embodiment is electrically connected to the underside of the magnet base 10. In other words, a current path is formed from the recess 45, which can come into contact with the workpiece, to the underside of the magnet base 10. For example, the magnet base 10, the mounting plate 20, and the clamping mechanism 30 are formed of conductors, and these components are in contact with each other so that a current can flow. In addition, metal is exposed from the recess 45, i.e., the end face of the pressing plate 43.

[0052] A clamping device having such a configuration is applied, for example, to a welding process using a welding machine. A method for producing a welded product by welding a work-piece 50 fixed by the clamping device will be described below using the flowchart in Figure 3. Also, Figure 13 is a diagram showing the configuration of the clamping device and work-piece 50 in the method for producing a welded product.

[0053] In step S1, workpieces 50 to be welded are placed on workpiece holding surface 51 via an insulator. In embodiment 3, workpiece holding surface 51 is the upper surface of welding platen 60. The insulator is an insulating protective film 54. Protective film 54 is attached to the lower surface of workpieces 50 that faces the upper surface of welding platen 60. Protective film 54 electrically insulates workpieces 50 from the upper surface of welding platen 60.

[0054] In step S2, magnet base 10 holding clamp mechanism 30 is attracted to jig installation surface 11. In the third embodiment, jig installation surface 11 is the upper surface of welding surface plate 60. The upper surface of welding surface plate 60 is electrically connected to welding machine 70. For example, the upper surface of welding surface plate 60 is connected to welding machine 70 by signal line 71. Signal line 71 is also referred to as an earth wire.

[0055] Furthermore, as a result of magnet base 10 being attracted to the upper surface of welding platen 60, the upper surface of welding platen 60 is electrically connected to the lower surface of magnet base 10. Therefore, the end surface of presser plate 43, i.e., recess 45 of clamp head 40, is electrically connected to welding machine 70 via the lower surface of magnet base 10, the upper surface of welding platen 60, and signal line 71.

[0056] As in the first embodiment, in steps S3 and S4, work-piece 50 is pressed by clamp head 40 to fix the posture of work-piece 50. Since recess 45 of clamp head 40 is in contact with work-piece 50, work-piece 50 is electrically connected to welding machine 70 via the clamping device, welding platen 60, and signal line 71.

[0057] In step S5, the welding portion of the workpiece 50 is welded by the welding machine 70. At this time, welding is performed with the tip of the torch 72 of the welding machine 70 in contact with or in close proximity to the workpiece 50.

[0058] When the welding machine 70 is a fiber laser welding machine, welding is performed with the tip of the torch 72 in contact with the work-piece 50. When the tip of the torch 72 comes into contact with the work-piece 50, a current path is formed from the torch 72 to the fiber laser welding machine via the clamping device, the welding surface plate 60, and the signal line 71. The fiber laser welding machine detects whether the tip of the torch 72 is in contact with the work-piece 50 based on the current flowing through the current path. Based on the detection result, the fiber laser welding machine irradiates the work-piece 50 with a laser from the torch 72. In other words, if the torch 72 is in contact with the work-piece 50, a laser is output, and if not, the laser is not output. Therefore, when the torch 72 is in contact with the work-piece 50, welding is performed and a welded product is produced.

[0059] When the welding machine 70 is a welding machine other than a fiber laser welding machine, welding is performed with the tip of the torch 72 in close proximity to the work-piece 50 within a predetermined distance. When the tip of the torch 72 is in close proximity to the work-piece 50, a spark occurs between the torch 72 and the work-piece 50 at the start of welding. This spark forms a current path from the torch 72 to the welding machine 70 via the clamping device, the welding surface plate 60, and the signal line 71. The welding machine 70 maintains an activated state based on the current flowing in this current path. When the tip of the torch 72 is not in close proximity to the work-piece 50, no current flows, and the welding machine 70 does not maintain an activated state. Therefore, when the tip of the torch 72 is in close proximity to the work-piece 50, welding is performed and a welded product is produced.

[0060] The clamping device of the third embodiment allows welding to be performed with the protective film 54 attached to the workpiece 50. In other words, this clamping device eliminates the need to peel the protective film 54 from the workpiece 50 and directly contact the workpiece 50 with the upper surface of the welding platen 60 during welding. Eliminating the need to peel the protective film 54 to establish a current path not only improves the productivity of the welding process but also prevents damage to the welded product during the process. Furthermore, the insulator between the workpiece 50 and the welding platen 60 is not limited to the protective film 54. For example, the insulator may be a resin, such as an injection-molded product. For example, if the workpiece 50 is a metal part embedded in resin, such as an injection-molded product, welding can be easily performed even if the resin portion contacts the upper surface of the welding platen 60 and the metal portion is electrically insulated from the upper surface of the welding platen 60. The clamping device of the third embodiment may also employ the clamp head 140 described in the second embodiment. Even in this case, the same effects as described above can be achieved.

[0061] As described above, when welding machine 70 is a fiber laser welding machine, welding is performed with the tip of torch 72 in contact with the welding location of workpiece 50. Therefore, two members 50A, 50B at the welding location must be fixed so that they do not shift relative to each other. The clamping device of embodiment 3 presses workpiece 50 and fixes two members 50A, 50B in contact with each other. This allows for a welding process that omits tack welding before main welding.

[0062] Workpiece-holding surface 51 on which workpiece 50 is held is not limited to the upper surface of welding surface plate 60, and may be formed of an insulating material. Workpiece-holding surface 51 may be the ground or an insulating floor surface. Even in this case, as in the above, when the tip of torch 72 comes into contact with or is close to workpiece 50, a current path is formed from torch 72 to welder 70 via the clamping device, welding surface plate 60, and signal line 71. This makes welding possible.

[0063] A current detection signal line (not shown) may be connected to a part or all of the path from the recess 45 of the clamp head 40 to the underside of the magnet base 10. For example, even if the surface of any of the clamp mechanism 30, the mounting plate 20, and the magnet base 10 is painted and no current path is formed, the current detection signal line can provide the same effect as above.

[0064] A coating layer made of a material that is softer and more conductive than metal may be formed on the end surface of each pressure plate 43. A current that can be detected by the welding machine 70 flows through the coating layer.

[0065] In the present disclosure, the embodiments can be freely combined, and the embodiments can be modified or omitted as appropriate. [Explanation of symbols]

[0066] 10 magnet base, 11 jig installation surface, 20 mounting plate, 21 screw, 30 clamp mechanism, 31 support, 32 beam portion, 33 grip handle, 33A grip portion, 33B screw portion, 40 clamp head, 40A first clamp head, 40B second clamp head, 40C adapter, 41 base portion, 42 bearing portion, 43 pressure plate, 44 space, 45 recess, 45A step, 45B corner portion, 46 claw portion, 47 pad portion, 50 welding object, 50A member, 50B member, 51 object holding surface, 52 ridge line, 53 top portion, 54 protective film, 60 welding surface plate, 70 welding machine, 71 signal line, 72 torch, 140 clamp head.

Claims

1. A magnetic base and a clamping mechanism including a clamping head that presses the workpiece to fix the position of the workpiece and is held by the magnet base; The clamp head A base portion; two pressure plates provided upright on the lower surface of the base portion; a recess provided on each end surface of the two pressing plates to press the workpiece, The clamping device, wherein the recess includes at least one of a plurality of steps and a plurality of corners that are provided so that the depth of the recess increases from the outside to the inside of the recess.

2. a mounting plate provided on an upper surface of the magnet base, the clamp mechanism is held by the magnet base via the mounting plate, The clamping device according to claim 1 , wherein the mounting plate is made of a non-magnetic material and covers at least a portion of a side surface of the magnet base.

3. The clamping device of claim 1 , wherein the width of the recess narrows from the outside to the inside of the recess.

4. The clamp head The clamping device according to claim 1 , further comprising a space provided between the two pressure plates and open in the direction in which the two pressure plates extend.

5. The clamp head a first clamp head; a second clamp head including the base portion and the two pressing plates; an adapter provided on an upper surface of the base portion and detachable to the first clamp head, the first clamp head includes a pad portion capable of pressing the workpiece in a state where the first clamp head is detached from the adapter, The clamping apparatus of claim 1 , wherein the second clamping head is held by the first clamping head when the first clamping head is attached to the adapter.

6. The clamping device according to claim 1 , wherein the recess is electrically connected to the lower surface of the magnet base.

7. A magnetic base and a clamping mechanism held by the magnet base, the clamping mechanism including a clamping head that presses the workpiece to fix the position of the workpiece; a mounting plate provided on the upper surface of the magnet base, the clamp mechanism is held by the magnet base via the mounting plate, The clamp device, wherein the mounting plate is formed of a non-magnetic material and covers at least a portion of a side surface of the magnet base.

8. A clamp head that presses an object to be processed to fix the position of the object, A base portion; two pressure plates provided upright on the lower surface of the base portion; a recess provided on each end surface of the two pressing plates to press the workpiece, The clamp head, wherein the recess includes at least one of a plurality of steps and a plurality of corners that are provided so that the depth of the recess increases from the outside to the inside of the recess.

9. The clamping head of claim 8 , wherein the width of the recess narrows from the outside to the inside of the recess.

10. The clamp head according to claim 8 , further comprising a space provided between the two pressure plates and open in the extension direction of the two pressure plates.

11. A method for manufacturing a workpiece, comprising: processing a workpiece fixed by a clamping device including a magnetic base and a clamping mechanism held by the magnetic base; a step of attracting the magnet base holding the clamp mechanism to a jig installation surface; and pressing the workpiece held on the object holding surface with a clamp head provided on the clamp mechanism to fix the posture of the workpiece, The clamp head A base portion; two pressure plates provided upright on the lower surface of the base portion; a recess provided on each end surface of the two pressing plates to press the workpiece, A method for manufacturing a workpiece, wherein the recess includes at least one of a plurality of steps and a plurality of corners that are provided so that the depth of the recess increases from the outside to the inside of the recess.

12. The width of the recessed portion narrows from the outside to the inside of the recessed portion, In the step of fixing the posture of the workpiece, The method for manufacturing a workpiece according to claim 11 , wherein the clamp head presses the workpiece with the recess in contact with the workpiece.

13. In the step of fixing the posture of the workpiece, 12. The method for manufacturing a workpiece according to claim 11, wherein the recess of the clamp head presses the workpiece with one corner provided on one of the two pressure plates and one corner provided on the other pressure plate in contact with the workpiece.

14. In the step of fixing the posture of the workpiece, 12. The method for manufacturing a workpiece according to claim 11, wherein the recess of the clamp head presses the workpiece with at least one of the top and ridge of the workpiece inserted into a space provided between the two pressure plates and open in the extension direction of the two pressure plates.

15. The clamp head a first clamp head; a second clamp head including the base portion and the two pressing plates; an adapter provided on an upper surface of the base portion and detachable to the first clamp head, In the step of fixing the posture of the workpiece, 12. The method for manufacturing a workpiece according to claim 11, wherein a pad portion provided on the first clamp head presses the workpiece when the first clamp head is detached from the adapter, or wherein the second clamp head held by the first clamp head presses the workpiece when the first clamp head is attached to the adapter.

16. placing an object to be welded on the object holding surface formed of an insulator, or placing an object to be welded on the object holding surface via an insulator; and performing welding with the tip of a torch of a welding machine in contact with or in proximity to the workpiece, the workpiece is the workpiece to be welded, the processing is the welding, the recess is electrically connected to the lower surface of the magnet base, The method for manufacturing a workpiece according to claim 11 , wherein the jig installation surface is electrically connected to the lower surface of the magnet base and the welding machine.

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