In view of the deformation and deflection of the long core-pulling needle in the deep and high pressure oil channel hole of the gearbox side cover in die casting process

the effects of the die casting process

mold structure and the material of the core-pulling needle on the deformation and deflection were analyzed.The results show that the casting scheme and the selection of key process parameters are very important to reduce the deformation and deflection of the long core-pulling needle. The positioning stability of long core-pulling needle

the piecewise matching structure of needle and needle sleeve

and the high-pressure cooling structure can all reduce the possibility of deformation and deflection of long core-pulling needle. The long core-pulling needle which produced by high strength W360 material can reduce the possibility of deformation and deflection of the long core-pulling needle.