Research On Hot-Stamping Of BS700 High-Strength Steel Track Shoe

With the development of the trend of the modern lightweight armored vehicles , using new, lightweight, high strength track shoe become one of the important research directions. In this paper, a new structure track shoe is trial-produced using BS700 high-strength steel by hot-pressing. The parameters of the track shoe forming process are determined by the numerical simulation of its forming process, and finally the track shoe is hot-pressed successfully. The structure strength of the track shoe is also simulated and analyzed in this paper. The analysis results show that the track shoe structure strength fully meets the requirement. Compared with the loading experimental results, some suggestions for improvement are given about the existing problems.Through the simulation of the track shoe forming process, the defeat which may occur at the deformation of bending and flanging in the forming process are predicted, and giving the modification scheme. Eventually the track shoe forming process parameters, blank size and preheat temperature are determined.The stamping die is designed and the forming test is according to the results of numerical simulation of forming process, and finally the track shoe is hot-pressed successfully. The analysis of organization before and after thermal deformation show that both of them are black ferrite and granular bainite, and the size of organization is no change after deformation. The mechanical properties, wear resistance of the track shoe both meets the part's requirement, and has enough safety margins.The structure strength of the track shoe is also simulated and analyzed in this paper, which fully meets the requirement of the special vehicle. Even under the impact load, the track shoe won't be premature failure because of its structural instability. Its structural stability meets the requirements. Simulation results indicate that there is stress concentration at the fillet of the track shoe mounting holes. The track shoe may be premature failure because of this. The test of the track shoe which is under static load shows that 8% of the track shoes appear crack at this place which causes the premature failure of the track shoe. This also is consistent with static simulation results. The square mounting hole should be modified to be round, which can abate the stress concentration of this place and improve the service life of the track shoe.