Contact Stress Analysis Of Crown-type Pneumatic Wheel With Soft-consolidation Abrasive And Experimental Study

The laser hardening technology is widely used in mold, and significantly improved the hardness and tear resistance of the mold. Oriented to the low finishing efficiency and uncontrollable surface accuracy of dome pneumatic wheel for large laser hardening mold, a new crown-type pneumatic wheel is desighed.This paper combined with the dome pneumatic wheel with soft-consolidation abrasive finishing techniques, dicussed an efficient crown-type pneumatic wheel through simulation research and experimental comparison. Furthermore, the stress distribution of more large-scale sizes’ crown-type models is researched so as to achieve efficient and high-precision finishing for the large car cover mold surface with laser hardening. The main contents are as followed:The non-linear characteristics analysis of pneumatic wheel provides a theoretical basis for building the simulation models. Based on existing materials properties of dome wheel, finishing constraints of crown-type wheel and the contact force test, the size and performance parameters of crown-type wheel are desighed and optimized.Through the flexibility analysis of dynamic contact process, the stress-strain relationship is obtained. The stress in the double layers’ s ystem has been analysed. Through velocity field analysis obtains: angential line speed of each point in contact area displays non-linear increasing trend, and thus the contact stress distribution shuld display decreasing trend to obtain uniform material removal rate.The finite element analysis of dome and crown-type models is contrasted to analyse the stress distribution by changed compression, furthermore, the stress distribution of large-scale sizes’ crown-type models is discussed. The simulation results show that the contact area of the crown-type pneumatic wheel is an approximate circular and the stress performances Gaussian type distribution, with the expansions of the model size,the stress region is enlarged accordingly, thus effectively increasing the finishing area.By measuring surface morphology and roughness values of the finishing mold, it shows that the crown-type penumatic wheel with soft abravises consolidation can achieve uniform material removal and efficient finishing, thus the simulation results are sufficiently verified. Furthermore, by constrating to the finishing test results of the large-scale crown-type wheel, it not only shows that the finishing efficiency is improved, but also the surface quality of the mold is improved significantly. Ultimately, the average surface roughness of the laser hardening mold is reduced to 30 ~ 33 nm, in order to achieve efficient and high-precision finishing for the large car cover mold surface with laser hardeningIn order to obtain nanometer precision laser hardening mold surface, the research ideas and results of the paper provide some theoretical guidance and technical reference value for more large-scale crown-type wheel.