The slanted-guide-pillar core-pulling mechanism is the most commonly used side core-pulling mechanism in die-casting die. But when filling the die with pressure, aluminum leak frequently happens between lower motion-stopping surface of sliding block and side surface of moving die insert, since the clearance is bigger between side core and core hole. In many improved approaches, changing the lower motion-stopping surface of sliding block into upper motion-stopping surface of it or reducing the lower motion-stopping surface area is the simplest and reliable measure. The sliding block’s setback which occurs in die-casting process can be eliminated effectively and the workload of maintaining die can be reduced by this measure.

The die-casting die of end cover of one diesel engine was designed. A double-stage linkage hydraulic core-pulling mechanism was designed and used in the die-casting die according to the complex structural features of the end cover casting. This double-stage linkage hydraulic core-pulling mechanism could achieve secondary core-pulling and decompose the packaging force. The disadvantages of deformation, crack, abruption in orifice or thin-walled parts of the casting could be overcome. The practice shows that the structure of die-casting die of end cover of diesel engine is reasonable, reliable, and applicable.

The variable-speed reducer is the key transmission part in the transmission mechanism of oil press, and with the analysis of the transmission plan, the variable-speed reducer of the transmission mechanism is designed according to the performance requirements of the oil press. The simulation analysis is processed by Solidworks, and the simulation results are consistent with theoretical design which meets the requirements of the manufacturing. In practical production and processing, it has very good reference and directive significance.