汽车典型CNC精密零件工艺特性概述

曲轴把活塞杆受到的力发送给发动机曲轴并和曲轴一起把活塞杆的直线运动转换为传动轴的转动健身运动，其每一个循环系统中承担更替2次拉应力和压内应力，承受力頻率很高。因为曲轴承担较大的负载，并在运转的疲惫负载下工作中，故曲轴不但对抗压强度有较高的规定，并且对品质尺寸公差明确提出高的规定。

曲轴样子繁杂，自由锻时，其工型杆部易造成折叠式，尤其是工型底端高宽比超过5的曲轴更易造成折叠式。处理对策主要是操纵胚料容积和预、终锻工字型位置横截面积的比率，并压挤成型。此外曲轴在削边时非常容易形变，可以在设计方案终CNC精密零件膛时，选用规格赔偿来处理，但这规定煅造溫度和生产节拍稳定，还需要确保削边刀口品质。更强选用削边和校准复合型模。近年来又发生胀断曲轴新技术应用。

The connecting rod transmits the force on the piston to the crankshaft and together with the crankshaft transforms the reciprocating motion of the piston into the rotating motion of the crankshaft. In each cycle, the connecting rod bears two alternating tensile and compressive stresses, with a high frequency of stress. Because the connecting rod bears a large load and works under the rotating fatigue load, the connecting rod not only has a high demand for strength, but also for the quality tolerance.

The shape of the connecting rod is complex. When forging, the I-shaped part of the connecting rod is easy to fold, especially when the width height ratio of the I-shaped bottom is greater than 5. The solution is mainly to control the ratio of the volume of the blank to the cross-sectional area of the I-shaped part of the pre and final forging, and to extrude. In addition, the connecting rod is easy to deform when cutting, which can be solved by dimension compensation when designing the final forging die bore, but this requires constant forging temperature and production beat, and must guarantee the quality of cutting edge. It is better to use trimming and correction compound die. In recent years, new technology of expanding and breaking connecting rod has appeared.

以上是《汽车典型CNC精密零件工艺特性概述》的介绍，原文链接：http://xcmjd.com/cncjmjjg/8609.html