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公开(公告)号：US20180071814A1
公开(公告)日：2018-03-15
申请号：US15554019
申请日：2016-03-23
发明人： Junichi OKUBO , Kenji TAMURA , Kunihiro YOSHIDA , Samsoo HWANG , Ryusuke NAKANO , Masao HORI
CPC分类号： B21K1/08 , B21J5/02 , B21J5/12 , F16C2220/46
摘要： A forged crankshaft production method includes a first preforming step, a second preforming step, and a final preforming step. In the first preforming step, sectional areas of portions to be formed into pins and sectional areas of portions to be formed into journals are decreased, whereby flat portions are formed, and the portion to be formed into the pin located at a second position is decentered. In the second preforming step, a portion to be formed into the pin located at a first position is decentered, and a portion to be formed into the pin located at a third position is decentered to a side opposite to the portion to be formed into the pin located at the first position. In a blank obtained thereby, portions to be formed into pins have been reduced and decentered, and the material yield rate can be improved.
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公开(公告)号：US20180071813A1
公开(公告)日：2018-03-15
申请号：US15554014
申请日：2016-03-18
发明人： Junichi OKUBO , Kenji TAMURA , Kunihiro YOSHIDA , Samsoo HWANG , Ryusuke NAKANO , Masao HORI
IPC分类号： B21K1/08
CPC分类号： B21K1/08 , B21J5/02 , B21J5/022 , F16C3/08 , F16C2220/40 , F16C2220/46 , F16C2360/22
摘要： A forged crankshaft production method includes a first preforming step, a second preforming step, and a final preforming step. The first pair of dies includes web processing parts to come into contact with portions to be formed into arms and portions to be formed into weights integrated with the arms. Each of the web processing parts includes an arm processing part and a weight processing part. The arm processing part and the weight processing part form a recessed portion, and the width of the open side of the weight processing part becomes greater with increasing distance from the bottom of the recessed portion. Accordingly, in the blank, volume can be distributed between a portion to be formed into an arm and a portion to be formed into a weight integrated with the arm, and the material yield rate can be improved.
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公开(公告)号：US20190217372A1
公开(公告)日：2019-07-18
申请号：US16329056
申请日：2017-09-13
发明人： Junichi OKUBO , Kenji TAMURA , Kunihiro YOSHIDA , Sam Soo HWANG , Ryusuke NAKANO , Masao HORI
CPC分类号： B21J5/02 , B21K1/08 , B23P2700/07 , F16C3/08 , F16C2220/46
摘要： Provided is a production method, including a first preforming process, a second preforming process, a final preforming process, and a finish forging process. 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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公开(公告)号：US20200290112A1
公开(公告)日：2020-09-17
申请号：US16332463
申请日：2017-08-24
发明人： Junichi OKUBO , Kenji TAMURA , Kunihiro YOSHIDA , Samsoo HWANG , Ryusuke NAKANO , Masao HORI
IPC分类号： B21K1/08
摘要： A production method includes a preforming process, a forming process and a finish forging process. In the preforming process, an intermediate preform is formed from a billet. In the forming process, while each of a plurality of rough journals of the intermediate preform is held and pressed vertically by a pair of holding dies, rough pins are decentered in directions perpendicular to the pressing direction by the holding dies and an axial direction of the intermediate preform, and the intermediate preform is pressed in the axial direction of the intermediate preform. In the finish forging process, a final preform is placed such that the directions in which the rough pins are decentered are parallel to a horizontal direction, and the thus placed final preform is pressed vertically by a pair of pressing dies. The production method reduces the risk of occurrence of seams on a forged crankshaft.
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公开(公告)号：US20190224741A1
公开(公告)日：2019-07-25
申请号：US16329621
申请日：2017-09-13
发明人： Junichi OKUBO , Kenji TAMURA , Kunihiro YOSHIDA , Sam Soo HWANG , Ryusuke NAKANO , Masao HORI
摘要： Provided is a production method, including a first preforming process, a second preforming process, a final preforming process, and a finish forging process. 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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