公开(公告)号：EP3290718B1

公开(公告)日：2019-06-12

申请号：EP17748373.2

申请日：2017-01-12

申请人： Zhongjuxin Ocean Engineering Equipment Co., Ltd

发明人： ZHANG, Lianhua ,  ZHANG, Hui ,  MA, Haijun

IPC分类号： F15B1/02 ,  F15B1/033 ,  B21J9/12 ,  B30B15/16 ,  B30B15/22

公开(公告)号：EP4420808A1

公开(公告)日：2024-08-28

申请号：EP22921459.8

申请日：2022-08-02

申请人： Zhongjuxin Ocean Engineering Equipment Co., Ltd.

发明人： ZHANG, Hui ,  ZHANG, Lianhua ,  CHEN, Xizhong

IPC分类号： B21J5/06 ,  B21J5/08 ,  B21J5/02 ,  B21J13/02 ,  B21J13/06 ,  B21J13/10 ,  B21K1/08

CPC分类号： B21J13/06 ,  B21J5/08 ,  B21K1/08 ,  B21J13/10 ,  B21J5/06 ,  B21J13/02 ,  B21J5/02

摘要： A two-fire forming forging process for a large crank throw, comprising a forging machine, an anvil die, and an operation device. The process comprises: setting the shape and parameters of a precast forging piece having a boss and two wings in a first fire, and using multiple upsetting and stretching processes to complete preform forging; setting the shape and parameters of a multi-step transition piece in a second fire, changing an angle for flipping back and forth and moving left and right for forging and pressing and repeatedly changing the anvil die for forging and pressing, rolling, pressing, and bending by using a reverse buckling bending die provided with an arc-shaped pressing face, pressing for multiple times by using a plurality of mandrels to realize progressive transition forming of the forging piece, so as to complete crank throw forming forging. According to the process, forming forging and bending forging of a crank throw forging piece are completed by using low pressure and a short forging stroke, so that a forging machine having low pressure completes a process of forging a large crank throw forging piece, and the process has the characteristics of a large forging ratio, a good forming degree, a short forging time, low material losses, and low production costs.