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公开(公告)号：EP3608036A1
公开(公告)日：2020-02-12
申请号：EP18781847.1
申请日：2018-04-03
发明人： TAMURA, Kenji , IMANISHI, Kenji , HWANG, Sam Soo , YABUNO, Kunihiro , YOSHIDA, Kunihiro , ISHIHARA, Koichiro
摘要： The production method disclosed includes a first step, a second step and a third step to be performed in this order. In the first step, a steel material is forged by dies, whereby a forged product including a rough web part (220) and four plate-shaped rough flange parts is produced. In the second step, at least one specified rough flange part, which is at least one of the four rough flange parts, is pressed by a first die, whereby a first bent portion bending outward in an up-down direction VD of the forged product is formed in the specified rough flange part. In the third step, the edge of the first bent portion is pressed by a second die (320) inward in the up-down direction VD, whereby the edge is deformed and a second bent portion (232b) is formed. In the third step, the edge of the specified flange part is deformed while the edge is kept from deforming in a front-rear direction HD.
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公开(公告)号：EP3608035A1
公开(公告)日：2020-02-12
申请号：EP18781843.0
申请日：2018-04-03
发明人： TAMURA, Kenji , IMANISHI, Kenji , HWANG, Sam Soo , YABUNO, Kunihiro , YOSHIDA, Kunihiro , ISHIHARA, Koichiro
摘要： In a pressing step, a first forged product (201) is pressed by a first die (310), and thereby, a second forged product (202) including a rough flange (241) having a thickness-changing portion (141) is produced. The thickness-changing portion (141) includes a front part protruding frontward from a side of a rough web part (220) and a rear part protruding rearward from the side of the rough web part (220). Each of the front part and the rear part includes a first part, and a second part that is thicker than the first part and is located farther from the rough web part than the first part. In the pressing step, at least a part of the rough flange that is above or below the web part (thick part) is pressed by the first die (310), whereby the material of the first forged product in the part is caused to flow frontward and rearward, and the thickness-changing portion (141) is formed.
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公开(公告)号：EP3639948A1
公开(公告)日：2020-04-22
申请号：EP18817759.6
申请日：2018-06-11
发明人： TAMURA, Kenji , OKUBO, Junichi , YOSHIDA, Kunihiro , HWANG, Sam Soo , NAKANO, Ryusuke , HORI, Masao
摘要： Disclosed method for producing a forged crankshaft includes: a clumping step of holding a first region (51a) by clumping a first region (51a) of a bar-like material (51) by a pair of first dies (10), and a decentering step of decentering a second region (51b) of the bar-like material (51) with second dies (20) while the first region (51a) being held. The second region (51b) is a pin-corresponding part which is to be the pin. The first region (51a) is a crank arm-corresponding part which is to be the crank arm. The decentering direction by the second die (20) is a direction perpendicular to each of the clumping direction by the first dies (10) and the longitudinal direction of the bar-like material (51), and is the same direction as the decentering direction of the corresponding pin. This will make it possible to improve material yield while suppressing increase in the facility cost.
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公开(公告)号：EP3608034A1
公开(公告)日：2020-02-12
申请号：EP18780696.3
申请日：2018-04-03
发明人： TAMURA, Kenji , IMANISHI, Kenji , HWANG, Sam Soo , YABUNO, Kunihiro , YOSHIDA, Kunihiro , ISHIHARA, Koichiro
摘要： The production method disclosed is a method for producing a front axle beam. The production method includes a die forging step and a bending step. The die forging step is a step of forging a steel material with dies to produce a forged product including a rough web part, which is to be formed into a web part, and four plate-shaped rough flange parts protruding frontward and rearward from an upper side and a lower side of the rough web part, respectively. The bending step is a step of pressing at least one specified rough flange part, which is at least one of the four rough flange parts, with a first die (310) to form a bent portion (232) in the specified rough flange part such that the bent portion is bent inward in an up-down direction (VD) of the forged product (201).
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公开(公告)号：EP3520925A1
公开(公告)日：2019-08-07
申请号：EP17855722.9
申请日：2017-09-13
发明人： OKUBO, Junichi , TAMURA, Kenji , YOSHIDA, Kunihiro , HWANG, Sam Soo , NAKANO, Ryusuke , HORI, Masao
摘要： Provided is a production method, including a first preforming process for obtaining a first preform from a billet, a second preforming process for obtaining a second preform from the first preform, a final preforming process for obtaining a final preform from the second preform, and a finish forging process for forming the final preform into a finishing dimension of the forged crankshaft by die forging. In the first preforming process, regions to be a pin and a journal are pressed respectively from a direction perpendicular to an axial direction of the billet, thus reducing cross sectional areas of each region and forming a plurality of flat parts. In the second preforming process, the first preform is pressed in the pressing direction, which is a direction perpendicular to decentering direction of a region to be a second pin. In the final preforming process, the second preform is pressed from a direction perpendicular to an axial direction of the second preform, and further a region to be a counterweight and a region to be a crank arm integrally including a counterweight are pressed in the axial direction of the second preform.
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公开(公告)号：EP3517230A1
公开(公告)日：2019-07-31
申请号：EP17852912.9
申请日：2017-09-13
发明人： OKUBO, Junichi , TAMURA, Kenji , YOSHIDA, Kunihiro , HWANG, Sam Soo , NAKANO, Ryusuke , HORI, Masao
摘要： Provided is a production method, including a first preforming process for obtaining a first preform from a billet, a second preforming process for obtaining a second preform from the first preform, a final preforming process for obtaining a final preform from the second preform, and a finish forging process for forming the final preform into a finishing dimension of the crankshaft by die forging. In the first preforming process, regions to be a pin and a journal are pressed respectively from a direction perpendicular to an axial direction of the billet, thus reducing cross sectional areas of each region and forming a plurality of flat parts. In the second preforming process, the first preform is pressed in the pressing direction, which is a width direction of the flat parts. In the final preforming process, the second preform is pressed from a direction perpendicular to an axial direction of the second preform, and further a region to be a counterweight and a region to be a crank arm integrally including a counterweight are pressed in the axial direction of the second preform.
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