A processing method for a metal plate includes a curve surface forming recess forming step, a protruding step, and a shaping and dividing step. In the curve surface forming recess forming step, a recess is formed in the metal plate, the recess having an outer periphery forming a curve surface, a side portion formed in a frustum, and a bottom portion being round. In the protruding step, a portion of the recess from the bottom portion to the side portion is protruded toward an inside of the recess, and the side portion of the recess is formed to be close to a center of the recess. In the shaping and dividing step, the protruded portion and the outer periphery of the recess are shaped so that the recess is divided into a group of the plural recess portions adjacent to each other.
The accuracy of the outer diameter of a metallic fabricated material having a circular tube section is improved. A metallic-fabricated-material manufacturing method according to the present invention includes a circular-tube-section forming step S300 and an elongation step S302. In the circular-tube-section forming step S300, plastic working is applied to a metal plate (not shown) so as to form a metallic fabricated material. In the elongation step S302, in a state in which a flange section of the metallic fabricated material is fixed, a rotation punch proceeds into a circular tube section of the metallic fabricated material. Accordingly, the circular tube section is elongated.
The present invention reduces the possibility of wrinkles forming between a cylindrical part and the periphery of a base thereof. A method for manufacturing a metal member is provided with a cylindrical part forming step S200 and a base wall thickness increasing step S202. The cylindrical part forming step S200 comprises forming a cylindrical part in a metal plate-shaped material. The base wall thickness increasing step S202 comprises increasing the wall thickness of a base portion of the cylindrical part. The base wall thickness increasing step S202 has an internal-peripheral-portion movement step S210 and a push-out step S214. In the internal-peripheral-portion movement step S210, a punch causes an internal peripheral portion on a distal-end side of the cylindrical part to move toward an internal peripheral portion on the base side. In the push-out step S214, the punch pushes out the moved portion of the cylindrical part moved in the internal-peripheral-portion movement step S210 in the opposite direction from the protrusion direction of the cylindrical part as viewed from the periphery of the base of the cylindrical part in a state in which the periphery of the base of the cylindrical part is interposed between a female die and a pressing die.
The present invention makes it less likely that an end of a tubular part is buckled when the thickness of the end is increased. This method for producing a sheet metal member includes a preformed material forming step S350, a one-end thickening step S352, and a shape-fixing step S354. The preformed material forming step S350 is a step for forming a preformed material. The preformed material (10) is provided with a tubular part. The one-end thickening step S352 is a step for pressing a one-end thickening mold against an annularly-shaped one end (26) of the tubular part. The shape-fixing step S354 is a step for fixing the shape of the one end. At the one-end thickening step S352, the one end (26) of the tubular part is thickened in a state where the movement of the one end of the tubular part is restricted.
It is intended to enhance not only a yield ratio being a proportion of weight of ring-shaped member to weight of starting material but also a yield ratio being a proportion of ring-shaped member to blank, thereby attaining cost reduction. There is provided a process for manufacturing a ring-shaped member from oblong ringlike blank (3), comprising expanding each of a pair of linking portions (3b,3c) from the inside of the blank (3) outward and simultaneously pressing each of a pair of circular arc portions (3d) from outside inward so as to effect expansion into a ring-shaped member.
A process for manufacturing a ring-shaped member, in which not only can material loss be zeroed to thereby attain reduction of processing cost but also a ring-shaped member can be obtained readily from a bar material through a reduced number of process steps. There is provided a process for manufacturing ring-shaped member (10) from metallic bar material (1), comprising the steps of pressing punch (tool, 4) against end face (1a) of metallic bar material (1) and carrying out stretch forming so as to produce projecting portion (1b) on the outer circumference of the end face; and making release hole (1c) in the center of the projecting portion (1b) and simultaneously cutting off the projecting portion (1b) from the bar material (1) to thereby obtain ring-shaped member (10).
A process for manufacturing a ring-shaped member, in which not only can material loss be zeroed to thereby attain reduction of processing cost but also a ring-shaped member can be obtained readily from a pipe material through a reduced number of process steps. There is provided a process for manufacturing ring-shaped member (10) from metallic pipe material (1), comprising the steps of carrying out stretch forming so as to produce flange portion (1c) at an end portion of the pipe material (1); and cutting off the flange portion (1c) from the pipe material (1) to thereby obtain ring-shaped member (10).
A process for manufacturing a ring-shaped member, in which not only can material loss be zeroed to thereby attain reduction of processing cost but also a ring-shaped member can be obtained readily from a pipe material through a reduced number of process steps. The process comprises the steps of carrying out stretch forming so as to produce inward flange portion (1c) at an end portion of metallic pipe material (1); and cutting off the flange portion (1c) from the pipe material (1) to thereby obtain ring-shaped member (10).
A process for manufacturing a ring-shaped member, in which not only can material loss be zeroed to thereby attain reduction of processing cost but also a ring-shaped member can be obtained readily from a pipe material through a reduced number of process steps. The process comprises the steps of slicing metallic pipe material (1) into short tubes (1a); expanding under pressure each of the short tubes (1a) into a flare configuration to thereby obtain flare body (1b); and press forming the whole of the flare body (1b) flatly so as to obtain ring-shaped member (10).
A process for manufacturing a ring-shaped member, in which not only can material loss be zeroed to thereby attain reduction of processing cost but also a ring-shaped member can be obtained readily from a pipe material through a reduced number of process steps. The process comprises the steps of slicing metallic pipe material (1) into short tubes (1a); shaping each of the short tubes (1a) into truncated circular cone tube (1b); and press forming the whole of the truncated circular cone tube (1b) flatly so as to obtain ring-shaped member (10).
The cost of a ring-shaped member is reduced by improving the yield, i.e., the ratio of the weight of the ring-shaped member to the weight of a material. A plurality of vertically long annular blanks (3) are punched out from the material (2) having a prescribed width, and the vertically long annular blanks (3) are formed on the annular ring-shaped member (1).
A method of manufacturing a ring-shaped member in which the outer sides of the pair of curved parts (3d) of a longitudinal annular blank are pressingly energized by the molding outer dies (14) of a pressing device (13) in the directions of the opposite side curved parts (3d) to push open each of the curved parts (3d) to a large curved part with a large radius of curvature to mold a half-finished product (17), and the half-finished product (17) is pushed open by a cooperation between the finishing inner die of the pressing device and a complete round type window part functioning as the outer die to manufacture the ring-shaped member. Since a yielding indicated by the ratio of the weight of the ring-shaped member to the weight of a raw material and a yielding indicated by the ratio of the ring-shaped member to the blank are increased, a manufacturing cost for the ring-shaped member can be reduced.
A method of manufacturing a ring-shaped member capable of reducing cost by increasing a yield represented by the ratio of the weight of the ring-shaped member to the weight of a raw material and a yield represented by the ratio of the weight of the ring-shaped member to the weight of a blank. A half-finished product (18) having largely curved parts (3D) formed by enlarging curved parts (3d) to increase its radius of curvature more than its initial radius of curvature and expansion parts (3E) curvedly formed in a circular arc shape on linear parts (3b, 3c) with a radius of curvature larger than the radius of curvature of the curved parts (3d) is molded, and then the half-finished product (18) is molded in a ring shape to provide the ring-shaped member (1).
patents
