Study On Strip Wound Die Of Backward Extrusion For Cross Shaft Sleeve

The cross shaft sleeve is a key component of the universal joint cross shaft rigidity,assembled on four shaft shoulders in the hole of the universal joint fork. Backward extrusionis a mechanical manufacturing technology products are manufactured mainly by die.Backward extrusion is a low-consumption, high-efficiency and high-quality die processingtechnology, which plays an important role in modern mechanical processing. However, thedie bears great loads during the forming process, likely to cause the failure of a die. The stripwound prestressed die is an effective way to significantly improve the life of a diesignificantly. The thin steel strip of high strength is utilized as the winding material tomanufacture the strip wound prestressed die, which can replace the prestressed rings in thetraditional combined prestressed die. Advantages can be found in high load carrying capacity,small size long life and high dimensional accuracy of the workpiece.For a cross shaft sleeve, studies on a strip wound die of backward extrusion for it aremade through integrated numerical simulation, theoretical analysis and experimental research.Firstly, the key technology of the backward extrusion numerical simulation is developed,which provides technical supports for the subsequent finite element analysis. Secondly, finiteelement analysis of the cross shaft sleeve in backward extrusion process is carried out throughANASYS/LS-DYNA. The equivalent stress distribution of cross shaft sleeve is obtained.Meanwhile, the load distribution of a backward extrusion die is analysed.According to the maximum load in the backward extrusion process of cross shaft sleevesand the material of die core, the best model of winding layers and winding tension of eachsteel strip is found by mathematical formula. The size of backward extrusion strip wound diefor cross shaft sleeve is carried out. Compared with traditional combined prestressed die, thesuperiority of strip wound die is proved.Based on the operating condition of strip wound die, a set of conical clamping device isdesigned. Clamp strength is provided to maintain the tension of strip through conicalmechanism. The protective jacket is used to protect the strip. Mechanical clamping device canmaintain permanently strip tension under the high temperature and cyclic loads. The strip tension clamping device is manufactured on the basis of design drawings. TheSteel strip winding device is used to wind the strip wound die. At the beginning of thisprocess, glue is used to fix the strip. In the ending, first the glue is adopted to paste the strip,then the Mechanical clamping device is used to maintain the strip tension.In conclusion, the design of strip tension clamping device is completed, which solves thestrip finishing problem. The design and manufacture of a strip wound die for cross shaftsleeve is accomplished, which provides experience for other strip wound die’s research andpromotes further development of strip wound die in domestic.