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1. 发明专利

JP2001071091A PRODUCTION OF OUTER-DIAMETER SIDE SPHERICAL SHAPED RING 失效
公开(公告)号：JP2001071091A
公开(公告)日：2001-03-21
申请号：JP24697699
申请日：1999-09-01
申请人： NIPPON KOSHUHA STEEL CO LTD , N K SEIATSU KK
发明人： IMAI KATSUYA , KAWADA YOKO , OKAMOTO HIROSHI , FURUSAWA SADAYOSHI , NAKADA MITSUAKI , YAMAMOTO MASAMI
IPC分类号： B21K21/06 , B21J5/02 , B21J5/08 , B21J13/02
摘要： PROBLEM TO BE SOLVED: To provide a forging method by which the machining to the inner- and the outer-diameter surfaces after forming is made unnecessary, an outer- diameter side spherically shaped ring developing no harmful flaws on the inner diameter surface is obtd., and the service life of die can be improved. SOLUTION: In a method for producing the outer-diameter side spherically shaped ring in which the outer diameter surface bulges in a spherical shape by a cold forging, after inserting an insert pin 3 having a diameter equal to the inner diameter of the ring into the inner diameter side of a cylindrical blank A having an outer diameter larger than the diameter of the end surface of the ring and smaller than the max. outer diameter of the ring and an almost equal inner diameter as the inner diameter of the ring, the cylindrical blank is compressed from its outer diameter surface sides of both end surfaces with a punch and the die having the outer diameter surface and the forming part of the end surface of the ring in symmetric shapes. The filling-up of the cylindrical blank into the forming space formed by the punch, die and insert pin is formed so as to simultaneously complete near the center of the outer diameter surface and near the end surfaces.

2. 发明专利

JP2000071046A METHOD OF MANUFACTURING STEPPED AND FLANGED ANNULAR MEMBER 失效
公开(公告)号：JP2000071046A
公开(公告)日：2000-03-07
申请号：JP24278398
申请日：1998-08-28
申请人： NIPPON KOSHUHA STEEL CO LTD , N K SEIATSU KK
发明人： IMAI KATSUYA , KAWADA YOKO , FURUSAWA SADAYOSHI , OKAMOTO HIROSHI , NAKADA MITSUAKI , IRISAWA KATSUFUMI
IPC分类号： B21J5/06 , B21J5/08 , B21K1/04
摘要： PROBLEM TO BE SOLVED: To prevent cracking, and improve dimensional accuracy and strength by smoothening the roughened surface occurring when sheared at the portion to become a small-diameter portion end face through upsetting at a particular upsetting rate, and then extruding the small-diameter portion. SOLUTION: A material 20 is upset to form a flat material 21, and through forward/ backward extruding, a cup-like material 22 with a concave hole 22a in its upper portion 22A and a convex portion 22B on its lower portion, is formed. Forward-extruding is done on the convex portion 22B to form a small-diameter portion 23B side and to make the stepped cup-like material 23. A scrap 24C of the inside diameter side is punched to form a stepped annular member 24 with a large-diameter portion 24A and a small-diameter portion 24B. The upsetting rate from the material 20 is set at 55% or lower and the outer periphery face of the flat material 21 is constrained by the inside diameter face of the dies. The diameter of the flat material 21 after upsetting is made equal to the outside diameter of the large-diameter portion 24A. The small-diameter portion 21A at the center of the flat material 21 is made thick and the diameter of the small-diameter portion 21A is made to be a trapezoidal shape smaller than the inside diameter of the small-diameter portion 24B.

3. 发明专利

JP2000237839A PRODUCTION OF COLLARED ANNULAR MEMBER 失效
公开(公告)号：JP2000237839A
公开(公告)日：2000-09-05
申请号：JP4092999
申请日：1999-02-19
申请人： NIPPON KOSHUHA STEEL CO LTD , N K SEIATSU KK
发明人： OKAMOTO HIROSHI , IMAI KATSUYA , KAWADA YOKO , FURUSAWA SADAYOSHI , NAKADA MITSUAKI , IRISAWA KATSUFUMI
IPC分类号： B21J3/00 , B21J5/06 , B21J5/08 , B21J5/10 , B21K1/12 , B21K23/04
摘要： PROBLEM TO BE SOLVED: To obtain a method to produce a collared annular member not generating a defect of a crack or, etc., to a collar part and a corner part of an inner diameter and having a shape of a large radiused part, etc., to the corner part. SOLUTION: After a piece 16 cut to a size required for a product from a bar or wire rod and applied with a lubricant film on the surface is pre-formed to a size roughly the same as the outer diameter of a cylinder part of the product 20, the pre-form is formed to a collared cylindrical piece 18 having a guide face 18c for forming a collar part end face shape and subsequently the collar part end face shape 19c is formed.

4. 发明专利

JPH11197780A MANUFACTURE OF STEPPED ANNULAR MEMBER, AND INNER AND OUTER RING MEMBER 失效
公开(公告)号：JPH11197780A
公开(公告)日：1999-07-27
申请号：JP1638498
申请日：1998-01-12
申请人： NIPPON KOSHUHA STEEL CO LTD
发明人： IMAI KATSUYA , KAWADA YOKO , FURUSAWA SADAYOSHI , NAKADA MITSUAKI , OKAMOTO SATORU , IRISAWA KATSUFUMI
IPC分类号： B21J5/06 , B21K1/04 , B21K21/08
摘要： PROBLEM TO BE SOLVED: To provide a manufacturing method in which the concentricity of each inside diameter and outside diameter of a large diameter cylindrical part and a small diameter cylindrical part of a forged stepped annular member can be machined with high accuracy, the cutting of the inside and outside diameter sides can be dispensed with, and the grinding can be directly performed. SOLUTION: In a forging method in which a disk-like stock 34' is forged or extruded to form a stepped annular member 43 where a large diameter cylindrical part 35 is concentrically connected to a small diameter cylindrical part 38 through a connection part 42, a recessed part 35A of the diameter slightly smaller than the inside diameter of a large diameter part of a product is formed on one surface side of the disk-like stock, and a cup-like stock 37 having a projecting part 36 is formed on the other surface side, a small diameter cylindrical part side of a stepped annular member is formed by the forward extrusion so that a die and a punch are not relatively moved to each other in the projecting part, an inner surface of the recessed part is ironed or extruded by the forward extrusion method to form the inside diameter of the recessed part to be the same as that of a large diameter part of the product, and a bottom plate part 38 on the inside diameter side of the small diameter cylindrical part is punched to communicate the recessed ports of the large diameter cylindrical part 35 and the small diameter cylindrical part. communicate the recessed part of the large diameter cylindrical part 35 with that of the small diameter cylindrical part 38.

5. 发明专利

JP2001121238A METHOD FOR PRODUCING OUTER DIAMETER SIDE SPHERICAL SHAPED RING 失效
公开(公告)号：JP2001121238A
公开(公告)日：2001-05-08
申请号：JP30152199
申请日：1999-10-22
申请人： NIPPON KOSHUHA STEEL CO LTD , N K SEIATSU KK
发明人： IMAI KATSUYA , KAWADA YOKO , OKAMOTO HIROSHI , NAKADA MITSUAKI
IPC分类号： B21K1/02 , B21J5/08 , B21K1/14 , B21K21/06
摘要： PROBLEM TO BE SOLVED: To provide a producing method of an outer diameter side spherical shaped ring, with which the burr on the outer diameter surface and the flaw on the inner diameter surface are not developed. SOLUTION: A cup shaped blank, of which outer diameter is larger than the diameter of the end surface of the outer diameter side spherical shaped ring and smaller than the maximum outer diameter and the inner diameter is smaller than the inner diameter of the above ring, is pressed from this bottom end surface side to flow this end surface into a forming space part, and the neighborhood of the center of the outer diameter surface is bulged to form the spherical surface. Further, the outer diameter surface near the end surface is drawn in and formed into the spherical shape and thereafter, the excess metal at the inner diameter side and the bottom part, are punched out.

6. 发明专利

JPH10296384A ANNULAR PARTS AND MANUFACTURE THEREOF AND EXTRUDING PUNCH 失效
公开(公告)号：JPH10296384A
公开(公告)日：1998-11-10
申请号：JP11756497
申请日：1997-04-21
申请人： NIPPON KOSHUHA STEEL CO LTD , N K SEIATSU KK
发明人： IMAI KATSUYA , KAWADA YOKO , KOTAKANE MASAAKI , NAKADA MITSUAKI , OKAMOTO HIROSHI , IRISAWA KATSUFUMI
IPC分类号： B21D28/00 , B21D53/16 , B21J5/06 , B21J9/20 , B21K21/06
摘要： PROBLEM TO BE SOLVED: To enable formation of a cupped or an annular parts having large reduction of cross-section even in the case of being the blank having high strength and to lengthen the life of tools such as an extruding punch or the like. SOLUTION: A manufacturing method of the annular parts has a preliminary extruding process for extruding the cylindrical blank 1 into a first cupped parts 3 having smaller inner diameter than the inner diameter of the annular parts, a main extruding process for extruding the first cupped parts into a second cupped parts 7 having the same inner diameter as the inner diameter of the annular parts and a punching-out process for punching out the bottom part 7A of the second cupped parts to form the annular parts 11, in order. Further, an extruding punch used in the main extruding process in this manufacturing method, has a large diameter part having the outer diameter for forming the inner diameter of the annular parts and a small diameter part having smaller outer diameter than the inner diameter of the first cupped parts at the tip part, and the tip part shapes smoothly connected with arc-state to each of the large diameter part, small diameter part and the tip end surfaces and the side surfaces thereof are provided.

7. 发明专利

JPH10263738A STEEL WIRE FOR COLD FORGING 失效
公开(公告)号：JPH10263738A
公开(公告)日：1998-10-06
申请号：JP8993397
申请日：1997-03-26
申请人： NIPPON KOSHUHA STEEL CO LTD , N K SEIATSU KK
发明人： IMAI KATSUYA , KAWADA YOKO , MACHIDA YUJI , KOTAKANE MASAAKI , OKAMOTO HIROSHI , NAKADA MITSUAKI , IRISAWA KATSUFUMI
IPC分类号： B21F99/00 , B21J1/00 , B21J5/00 , B21F21/00
摘要： PROBLEM TO BE SOLVED: To improve the roll-over and the circularity of a cut piece, to reduce the roll-over quantity at the end face of a product, and to improve the yield of the material by setting the maximum hardness position in the section of the steel wire to be in the prescribed position, reducing the hardness from this position toward the center of the steel wire, and specifying the surface hardness increase ratio. SOLUTION: The maximum hardness area V in the section is set at the position within 1/10 of the radius (r) of the steel wire from the surface of a steel wire 11, and the area toward the center side from this area is set to be the area W where the hardness is dropped. The surface hardness increase ratio ((H-Q)/Q)×100% is set to be 15-30%, where H is the maximum hardness, and Q is the hardness at the position of r/2 from the surface. Only the hardness of the surface of the steel wire is increased, the circularity and the roll-over of the cut piece is improved, the roll-over quantity at the end face of a product after the cold forging can be sufficiently reduced, the cutting cost of the roll- over is reduced, and the yield of the material is improved.

8. 发明专利

JP2000140979A STEPPED SHAFT PART AND ITS PRODUCTION METHOD 失效
公开(公告)号：JP2000140979A
公开(公告)日：2000-05-23
申请号：JP32027298
申请日：1998-11-11
申请人： NIPPON KOSHUHA STEEL CO LTD , N K SEIATSU KK
发明人： KAWADA YOKO , IMAI KATSUYA , OKAMOTO HIROSHI , NAKADA MITSUAKI
IPC分类号： B21J5/00 , B21J5/06 , B21J5/08 , B21K1/12
摘要： PROBLEM TO BE SOLVED: To secure the coaxiality between a large diameter part and a small diameter part without cut of a fiber flow at a stepped part and to prevent generation of an end face crack in extrusion forging. SOLUTION: A wire or bar of a high speed tool steel cut to a prescribed length by shearing is upset so as to bend a peripheral part of its cut face inward, is formed into a stepped shaft stock consisting of a large diameter part 22A/small diameter part 22B by extrusion-formed by a die arranged with a large diameter part/small diameter part, the stock is constituted so that a fiber flow P, in which a recessed part formed to an extrusion side end face of the small diameter part is formed to a flat face, is continued from the large diameter part to the small diameter part, further the large diameter part/small diameter part is continued as forming a circular arc or a corner like stepped part 22C.

9. 发明专利

JP2000094080A PRODUCTION OF RING SHAPED PART 失效
公开(公告)号：JP2000094080A
公开(公告)日：2000-04-04
申请号：JP26256598
申请日：1998-09-17
申请人： NIPPON KOSHUHA STEEL CO LTD
发明人： IMAI KATSUYA , KAWADA YOKO
IPC分类号： B21D53/16 , B21D28/00 , B21J5/06 , B21K21/06
摘要： PROBLEM TO BE SOLVED: To provide a production method to produce the ring shaped part by forging in which a high strength material hard to work is used for a stock, a large cross section reduction rate is possible and a crack is not generated at an end face part. SOLUTION: A cylindrical stock 1 is subjected to preliminary extrusion to extrude a first cup shaped member 2 having an inner diameter (ϕb) smaller than a product diameter (ϕa), successively, the inner diameter of the cup shaped member 2 is formed to the same diameter as the product diameter, at the same time, an excessive stock part 3d caused at this working is moved to a bottom scrap part 3c to form a second cup shaped member 3, the scrap part 4c is punched at the inner diameter side, and the ring shaped part 4 is formed.

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