Technical field [0001] The present invention, automotive, household appliances, architectural structures, ships, bridges, construction machinery, used in various plants such as, iron, copper, zinc, tin, aluminum, titanium, magnesium, or an alloy of them with group shearing method of the metal plate, in particular, in the shearing surface of the metal plate joined welded to concerns shearing method capable of increasing the fatigue properties and hydrogen embrittlement resistance. BACKGROUND [0002] 　Shearing such as punching or piercing of the sheet metal by press, production efficiency is high, and since the processing cost is inexpensive, widely used in the processing of such electronic devices and components for automobiles. However, when shearing high strength steel sheet of more than 1000 MPa, tensile residual stresses in the punched end face (shear processing surface) (hereinafter referred to unless otherwise specified, a tensile residual stress simply as "residual stress".) Increases , (which 置割, also referred to as delayed fracture.) hydrogen embrittlement cracks become likely to occur, fatigue resistance is lowered. [0003] 　Also, tailored blanks joined by welding same or different steel (TWB: Tailor Welded Blank) case of shearing the workpiece, such as welds (hereinafter consisting weld metal and the heat affected zone, simply "weld" that. the shearing surface of), hydrogen embrittlement resistance and fatigue properties, it is known that further reduced. [0004] 　Note that the sheet metal referred to herein, after shearing of the punched or piercing by press, subject to hole expansion processing or flange up processing of the shearing part, cold-rolled sheet, or thickness a following plate is 3.0 mm, refer to iron, copper, zinc, tin, aluminum, titanium, a metal plate made of an alloy with magnesium or group, respectively. [0005] 　Punched end surface of the workpiece after punching has been performed, sag workpiece is formed pressed by a punch, the space between the punch and the die (hereinafter, simply referred to as "clearance".) workpiece is drawn within, shearing surface formed by being locally stretched, middle shearing surface formed, fracture surface formed by fracture workpiece, and the punching back surface of the workpiece constituted by the burrs that occur. [0006] 　Usually, sagging at the punched end surface of the above, shearing surface, fracture surface, and, and to suppress the occurrence of burrs within the required range, stretch flange formability, fatigue resistance, and, hydrogen embrittlement resistance and the like, processed aiming to improve the end face characteristics after adjusts the clearance and tool shape. [0007] 　For example, Patent Document 1, has a bending blade having a shape of the convex portion to the tip portion of the cutting edge of the punch and / or die, and a predetermined radius of curvature, with a tool having a blade shoulder angle , clearance, as more than 25% of the thickness of the workpiece, to reduce the work hardening and tensile residual stress at the end face after processing is disclosed. [0008] 　Further, Non-Patent Document 1, the clearance, and as 1% or less at a thickness ratio of the thickness of the workpiece, performs the shearing under high compressive stress, reported to reduce tensile residual stress in the vent face It is. Further, Patent Document 2, the direction having excellent ductility, by setting the cutting edge direction of the punch of the wedge shape 10 ° or less, a method of performing a piercing excellent in burring properties is disclosed. [0009] 　Further, Patent Document 3, the upper die for molding the different parts, comprising a lower mold for molding the different parts of the respective press-molding machine for molding the different parts at the same time is disclosed. Wherein the upper mold, and a plurality of upper die portion for molding the respective components, and the blank holder provided in a central portion of the upper mold portion, the upper blank holder convex formed to protrude downward on the lower surface of and a cutting portion. [0010] 　Further, Patent Document 4, the press and the lower blade supporting a processed workpiece, the trimming device is disclosed comprising a blade upper shearing the portion of the workpiece to advance against the lower blade It is. Trimming device is provided integrally with a protruding edge biting projecting in the traveling direction of the upper blade to a portion of the upper blade, prior to the time of descent of the upper fracture in the workpiece. [0011] 　By controlling the shearing, if it is possible to reduce the residual stress of the shear edge, it is possible to improve the hydrogen embrittlement resistance and fatigue resistance (e.g., Patent Document 1 and Non-Patent Document 1, reference). However, there is difficulty in shearing surface formed by the method of Patent Document 1. That is, when a uniform punch shape to the cutting ridge line direction in the shearing surface, there is a problem that easily cracks occur in low ductility and toughness weld. [0012] 　Controlling the shearing conditions so as to reduce preferentially the residual stress of the weld, the shearing surface of the workpiece, it is possible to enhance the fatigue resistance and the hydrogen embrittlement resistance, in Non-Patent Document 1 as the method, the punch and die clearance, when 1% or less at a thickness ratio of the thickness of the workpiece, by a slight misalignment of the punch, the punch comes into contact with the die, the punch and / or die failure there is a risk that. [0013] 　Further, the punch and die clearance, is not more than 1% at a thickness ratio of the thickness of the workpiece, the clearance is changed punches and / or sides of the die is worn, the shearing surface of the workpiece , the effect of improving the fatigue resistance and hydrogen embrittlement resistance is a problem that not sufficiently obtained. [0014] 　Also, punching method of Patent Document 2, the trimming apparatus of a press molding method and Patent Document 4 of Patent Document 3 are both not disclose shearing the shearing at a shear line intersecting the weld. That is, none of the Patent Documents 1 to 3 do not disclose the condition of reducing the residual stress of the shearing surface of the weld. CITATION Patent Document [0015] Patent Document 1: JP 2006-224151 Patent Publication Patent Document 2: JP 2014-111283 Patent Publication Patent Document 3: JP 2009-183989 Patent Publication Patent Document 4: Real-Open 4-060318 JP Non-patent literature [0016] Non-Patent Document 1: 63rd plastic working Union Lecture Proceedings, 338 pages Summary of the Invention Problems that the Invention is to Solve [0017] 　The present invention has been made in view of the problems of the prior art, the step width of the welded portion is large, and / or the workpiece with a welded strength 1000MPa or more steel and other steel plate (including a strength 1000MPa or more steel sheets), provided in shearing of shearing at a shear line, together they can form a shearing surface residual stress is small, and an object thereof is to prolong the life of the punch, the shearing method of solving the problem of crossing the weld an object of the present invention is to. By reducing the residual stress, surface properties of the fracture surface was improved, hydrogen embrittlement resistance is improved as a result. Means for Solving the Problems [0018] 　The present inventors have intensively studied a technique for solving the above problems. As a result, the cutting edge of the punch, the projections, for example, a wedge shaped projection, provided two at required intervals, between the two projections, all or part of the welded portion thereof is positioned workpiece If shearing and even if the step width of the welded portion is large, (x) the residual stress is small, it is possible to form an excellent shearing surfaces face property, and wear of the projections of the (y) edge to suppress progression was found to be able to extend the life of the punch. [0019] 　Further, the present inventors have found that the workpiece is, even when the workpiece with a welded strength 1000MPa or more steel and other steel plate (including a strength 1000MPa or more steel), (x) the residual stress is small, the face property it is possible to form an excellent shearing surface, and to suppress the progress of wear of protrusions (y) edge, were found to be able to extend the life of the punch. [0020] 　The present invention has been made based on the above findings and has as its gist is as follows. [0021] 　(1) at least die, using a shearing device comprising a stopper and punch, a shearing method for shearing to intersect the weld workpiece obtained by welding two metal plates, 　the punch It has on its cutting edge, has two projections, 　the whole or a part of the welded portion of the workpiece is, shearing wherein the located between two projections of the punch. [0022] 　(2) the two projections, the in cross section formed in a moving direction of the ridge and the punch formed by the cutting edge of the punch, toward the proximal end of the punch at the tip of the projection, slide into spaced is opposing sides shearing method according to (1), wherein the. [0023] 　(3) said two pieces of the shape of the tip of the projection, in the section formed by the ridge line where the cutting edge of the punch forms with the moving direction of the punch, both, flat, arcuate, or a bevelled shearing method according to (1) or (2), characterized in. [0024] 　(4) the two pieces of the shape of the tip of the projection, in a cross section formed by ridgeline cutting edge forms of the punch and the moving direction of the punch, respectively, flat, arcuate, or a slope shape, and , shearing method according to (1) or (2), wherein different. [0025] 　(5) the two projections, shear according to any one of the above in a direction parallel to the weld workpiece, characterized in that it is formed at the same height (1) to (4) processing method. [0026] 　(6) the two projections, according to any one of the direction parallel to the weld workpiece, said characterized in that it is formed at a height that gradually decreases (1) to (4) shear processing method. [0027] 　(7) wherein the two projections of the tip spacing D (mm), with respect to the width d of the weld (mm), and characterized in that 0.8 × d above 3.0 × d (mm) or less shearing method according to any one of (1) to (6) to. [0028] 　(8) in the cross section formed in a moving direction of the ridge line between the punch cutting edge forms of the punch, and the side opposite of the two projections, and the ridge, and the line connecting the tips of the two projections in S and each projection is the area surrounded by, is 1/2 and the other projection and opposite sides, and the ridge line, from the tip of the projection of the sum of the areas surrounded by the perpendicular line drawn to the ridge S 'is shearing method according to any one of (1) to (7), characterized by satisfying the following formula (1). 　0 6S ', it could not be verified hydrogen embrittlement cracks suppressing effect at a concentration of at least 10 g / L. Industrial Applicability [0105] 　As described above, according to the present invention, the step width of the welded portion is large, and / or the workpiece with a welded strength 1000MPa or more steel and other steel plate (including a strength 1000MPa or more steel) welds in shearing to shearing at a shear line intersecting the residual stress is small, excellent in surface properties, tensile properties, fatigue resistance, and can form a shearing surface excellent in hydrogen embrittlement resistance and, it is possible to prolong the life of the punch. Accordingly, the present invention has high applicability in steel processing industry. DESCRIPTION OF SYMBOLS [0106] 　1 workpiece 　1a thin metal plate 　1b thick metal plate 　2 punch 　2a, 2b, 2c projection 　2b ', 2c' projection of the tip 　3 die 　8 stopper 　9 welds 　9a, 9b heat-affected zone 　10 shearing device 　22b, 22b 'projections the tapered surface 　22c, 22c 'the tapered surface of the projection 　23b, the proximal end portion of the 23c protruding 　thickness of t1, t2 metal plate 　width d weld 　step width Δt welds 　of s1, s2 of the projection tip contact point 　of the L projection distance of the base end portion 　distance between the centers of the tip of the D 2 pieces of projection 　height H projection 　W, Wb, the width of the base end portion of the Wc projection 　angle between the pair of tapered surfaces of the α projections The scope of the claims [Requested item 1] 　At least the die, using a shearing device comprising a stopper and punch, a shearing method for shearing to intersect the weld workpiece obtained by welding two metal plates, 　the punch, the the cutting edge, has two projections, 　the whole or a part of the welded portion of the workpiece is, shearing wherein the located between two projections of the punch. [Requested item 2] 　Wherein the two projections in a cross section formed in a moving direction of the ridge and the punch formed by the cutting edge of the punch, toward the proximal end of the punch at the tip of the protrusion, and wherein the slide into spaced is opposing sides shearing method according to claim 1. [Requested item 3] 　Wherein the two shapes of the tip of the projection, in a cross section formed by ridgeline cutting edge forms of the punch and the moving direction of the punch, both, flat, arcuate, or a feature that it is bevelled shearing method according to claim 1 or 2. [Requested item 4] 　Wherein the two shapes of the tip of the projection, in a cross section formed by ridgeline cutting edge forms of the punch and the moving direction of the punch, respectively, flat, arcuate, or a slope shape, and different shearing method according to claim 1 or 2, characterized in. [Requested item 5] 　The two projections, in a direction parallel to the weld workpiece, shearing method according to any one of claims 1 to 4, characterized in that it is formed at the same height. [Requested item 6] 　The two projections, in a direction parallel to the weld workpiece, shearing method according to any one of claims 1 to 4, characterized in that it is formed at a height gradually decreases. [Requested item 7] 　Claim the distance D of two of the projecting tip (mm) is, with respect to the width d of the weld (mm), which is characterized in that not more than 0.8 × d above 3.0 × d (mm) shearing method according to any one of 1-6. [Requested item 8] 　In a cross section formed in a moving direction of the ridge line between the punch cutting edge of the punch forms, surrounded by the side faces of the two projections, and the ridge, and the line connecting the tips of the two projections and S is the area, in each of the projections, and the other projection and opposite sides, and the ridge and S 'is a half of the sum of the areas surrounded by the perpendicular line drawn to the ridge line from the tip of the projection , shearing method according to any one of claims 1 to 7, characterized by satisfying the following formula (1). 　0