This paper introduces an evaluation method for the quality of assembled camshafts under pulsating hydroforming, aimed at laying a certain foundation for the automobile engine industry in the future. The novelty of the design lies in applying a pulsating hydraulic pressure to the interior of a hollow shaft such that it exhibits an interference fit with the cam (cam-bores with non-circular structure) after being deformed by the pressure. A camshaft with a trilobe polygonal inner profile is selected and studied by conducting experiments and finite element analysis. The quality of the camshaft varies with the process parameters (pulsating amplitude, pulsating frequency, and hydraulic pressure). The effects of these parameters are investigated by evaluating the filling rate of the shaft and torsion strength of the assembled camshafts. Moreover, a new measurement method for the filling rate of the shaft is developed. Finally, the quality of a pulsating, hydraulically assembled camshaft is compared with that of a non-pulsating hydraulically assembled camshaft, thereby validating the proposed evaluation method. The preliminary feasibility of the pulsating hydraulic connection for the assembled camshafts with a trilobe polygonal profile is demonstrated in this study.

介绍了脉动液压成形下凸轮轴总成质量的评价方法，旨在为今后的汽车发动机产业奠定一定的基础。该设计的新颖之处在于向空心轴的内部施加脉动液压，以使其在压力变形后与凸轮（具有非圆形结构的凸轮孔）过盈配合。通过进行实验和有限元分析，选择并研究了具有三叶形多边形内部轮廓的凸轮轴。凸轮轴的质量随过程参数（脉动幅度，脉动频率和液压）而变化。通过评估轴的填充率和已组装凸轮轴的抗扭强度来研究这些参数的影响。此外，开发了一种新的轴填充率测量方法。最后，将脉动液压组装式凸轮轴的质量与非脉动液压组装式凸轮轴的质量进行比较，从而验证了所提出的评估方法。在这项研究中证明了对具有三叶多边形轮廓的已组装凸轮轴进行脉动液压连接的初步可行性。