Abstract: A metal member includes a first plate, and a second plate abutting against and welded to the first plate in at least one butt portion. In the butt portion, a length from a first end to a second end of a welding boundary line between the first plate and the second plate is longer than a length of a straight line connecting the first end to the second end of the welding boundary line.

Abstract: A press apparatus according to an embodiment includes an upper die and a lower die, and configured to manufacture a different-thickness metal plate, in which: the lower die includes: a wall surface facing a cavity; a fixing part configured to fix both ends of the metal plate, the both ends of the metal plate being placed so that its plate surface faces upward; and a rotating mechanism configured to rotate the metal plate so that the metal plate is brought into an upright position along the wall surface; and the upper die includes: a slide moving part including an opposed surface opposed to the wall surface and configured to descend in the cavity along the wall surface; and a cutting tool disposed on the opposed surface; and shaving is carried out on at least a part of the plate surface of the metal plate.

Abstract: A metal member manufacturing method according to one form of this disclosure is a method of manufacturing a metal member that is thinner at some portions than at other portions. The method includes a formation step of pressing one surface of surfaces of a metal workpiece that are perpendicular to a thickness direction with a press-working die so as to form a raised portion in the other surface, and a cutting step of moving a cutting blade along the other surface to cut off the raised portion by shaving. In the formation step, the raised portion is formed such that the area of a cross-section of the raised portion that is parallel to a moving direction of the cutting blade and perpendicular to the other surface decreases toward an end of the raised portion on a rear side in the moving direction of the cutting blade.

Abstract: A metal member includes a first plate, and a second plate abutting against and welded to the first plate in at least one butt portion. In the butt portion, a length from a first end to a second end of a welding boundary line between the first plate and the second plate is longer than a length of a straight line connecting the first end to the second end of the welding boundary line.

Abstract: A metal member includes a first plate, and a second plate abutting against and welded to the first plate in at least one butt portion. In the butt portion, a length from a first end to a second end of a welding boundary line between the first plate and the second plate is longer than a length of a straight line connecting the first end to the second end of the welding boundary line.

Abstract: A metal member manufacturing method according to one form of this disclosure is a method of manufacturing a metal member that is thinner at some portions than at other portions. The method includes a formation step of pressing one surface of surfaces of a metal workpiece that are perpendicular to a thickness direction with a press-working die so as to form a raised portion in the other surface, and a cutting step of moving a cutting blade along the other surface to cut off the raised portion by shaving. In the formation step, the raised portion is formed such that the area of a cross-section of the raised portion that is parallel to a moving direction of the cutting blade and perpendicular to the other surface decreases toward an end of the raised portion on a rear side in the moving direction of the cutting blade.

Abstract: A metal member manufacturing method according to one form of this disclosure is a method of manufacturing a metal member that is thinner at some portions than at other portions. The method includes: a formation step of pressing one surface of surfaces of a metal workpiece that are perpendicular to a thickness direction with a press-working die so as to form raised portions in the other surface; an application step of applying a lubricant; and a cutting step of moving a cutting blade along the other surface to cut off the raised portions by shaving. In the formation step, a sump in which the lubricant is held is formed between the raised portions in the other surface or at a position on a rear side of the raised portions in a moving direction of the cutting blade, and in the application step, the lubricant is applied to the sump.

Abstract: A metal member includes a first plate, and a second plate abutting against and welded to the first plate in at least one butt portion. In the butt portion, a length from a first end to a second end of a welding boundary line between the first plate and the second plate is longer than a length of a straight line connecting the first end to the second end of the welding boundary line.

Abstract: A manufacturing method of a metal member includes performing first shaving on a first surface perpendicular to a thickness direction of a metal plate, in a first portion of the metal plate by moving a cutting edge in a direction along the first surface. In the metal plate, the thickness of the first portion is reduced to be smaller than the thickness of a second portion by the first shaving.

Abstract: A bent member is a bent member including a metallic plate that is a main body, reinforcing plates provided to extend along bent portions formed by bending the metallic plate. The reinforcing plate is fitted in the opening formed in the metallic plate, and are welded to the metallic plate.

Abstract: A method of shot peening according to the present invention includes: placing a jig having an appropriate dimension at one face side of a stamped workpiece; and performing shot peening on another face side of the workpiece in a state where the jig is placed at the one face side of the workpiece, and conforming the workpiece to the jig. At this time, the shot peening may be performed in such a way that residual stresses in the inner side and the outer side of the curved part of the workpiece will become compressive stresses.

Abstract: A method of shot peening according to the present invention includes: placing a jig having an appropriate dimension at one face side of a stamped workpiece; and performing shot peening on another face side of the workpiece in a state where the jig is placed at the one face side of the workpiece, and conforming the workpiece to the jig. At this time, the shot peening may be performed in such a way that residual stresses in the inner side and the outer side of the curved part of the workpiece will become compressive stresses.

Abstract: A cutting device for cutting a flat workpiece includes a nibbler that continuously punches the workpiece, and a fluid spraying device that sprays a fluid onto the surface of the workpiece. The nibbler includes a cylindrical case, a punch that has a punch blade for punching the workpiece and that is accommodated in the case to have reciprocating motion in the vertical direction, and a die provided below the case. The cutting device is configured to move the workpiece interposed between the case and die in a prescribed direction while continuously punching the workpiece with the punch. The fluid spraying device has a spray port from which the fluid is discharged and is configured so the fluid is discharged from the spray port in the direction in which the punch approaches the die. The spray port of the fluid spraying device is disposed near the punch blade of the punch.

Abstract: [Problem] To provide a method for producing a non-rectangular steel sheet to be heated to the predetermined temperature, a method and apparatus for producing a press-molded article using the non-rectangular steel sheet for press molding that is produced by means of that method for producing the same. [Solution] The method for producing a steel sheet for press molding according to one embodiment of the invention includes an electrical heating process (STEP-101) for electrically heating a blank (10) of rectangular steel sheet, viewed from the thickness direction of the blank, and a bending process (STEP-102) for deforming the blank (10) from a rectangle to a non-rectangle by applying stress in a horizontal direction to the surfaces (front (10a) and back (10b)) of the blank (10) after the start of electrical heating.

Abstract: In a hot press molding method for press-molding a heated material and cooling the material while holding the material in a mold, during press molding of the material, shape changes including a portion that curves with respect to a longitudinal direction of the material are molded at longitudinal opposite end portions of the material and resistance to thermal contraction force of the material in the longitudinal direction during cooling is imparted. In one embodiment of the present invention, the shape changes molded on the material during the press molding are minute protrusions provided on surfaces of the longitudinal opposite end portions of the material. The invention makes it possible to suppress thermal contraction of the material during cooling in hot press molding to thereby prevent defects associated therewith.

Abstract: According to a hydraulic bulge forming method, a bend pipe is inserted in a cavity, and when the bend pipe is subjected to bulge forming, the bend pipe is elastically deformed by supplying a pressure medium to an interior of the bend pipe so that an inside of the bent portion is bulged along a bulging region formed at a portion of the cavity corresponding to an inside of a bent portion of the bend pipe. Whereby a reduction in a wall thickness of the outside portion of the bent portion is suppressed, so that a danger of causing breaking can be prevented.