Influence of the forming angle in cross wedge rolling on the multi-directional forging of crankshafts
Influence of the forming angle in cross wedge rolling on the multi-directional forging of crankshafts
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DOI：
10.1007/s12289-016-1326-3
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发表时间：
2018-01-01
影响因子：
2.4
通讯作者：
Rasche, Neelam
中科院分区：
文献类型：
--
作者：
Behrens, Bernd-Arno;Stonis, Malte;Rasche, Neelam
在生产曲轴的每个工业过程中，都要求低能耗和快速加工时间。曲轴具有非常复杂的几何形状，与其他锻造部件相比，锻造的闪光率很高。最近的研究表明了曲轴无闪锻的可行性。采用楔横轧、多向锻造和终锻三步成形是实现无闪弧曲轴三步成形的一种方法。本文介绍了楔横轧成形角α对多向锻造不同工艺参数影响的研究结果。首先，介绍了技术的现状。作为研究的基础，介绍了楔横轧和多向锻造的工艺开发和刀具设计。随后，本文将对成形角α对毛边产生、坯料温度、成形程度、成形力和有效应变的影响进行参数研究。通常，由于旋转对称钢坯被迫进行不对称运动而产生闪光。增大成形角的影响会导致曲翼底部的闪光量增大。
In each industrial process for the production of crankshafts a low energy demand and a fast processing time are required. Crankshafts have a very complex geometry and are forged with a high percentage of flash compared to other forging parts. Recent research showed the feasibility of a flashless forging of crankshafts. One way to forge a flashless crankshaft within three steps is to use cross wedge rolling, multi-directional forging and final forging. This paper presents the investigation results regarding the influence of the forming angle alpha in cross wedge rolling on different parameters at multi-directional forging. First, the state of the art is presented. As a basis for the investigations the process development and tool design of cross wedge rolling and multi-directional forging are described. Afterwards the paper's results regarding the influence of the forming angle alpha on flash generation, billet temperatures, forming degree, forming forces and effective strain will be presented as a parameter study. Generally, flash is generated because a rotation-symmetric billet is forced into an asymmetric movement. The influence of an increasing forming angle leads to a higher amount of flash at the bottom of the crankwebs.