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为了满足采掘工作迅速发展的需要,我厂试制生产了 YT-26型气腿式凿岩机。该机主要件气缸和机头均采用精密铸造工艺。凿岩机的主机在工作期间,承受多冲击的交变载荷和较高的冲击频率(f=2000次/分)。就气缸而言,因活塞往复运动,工作时产生很高的局部压力和相对磨损。从铸造角度上看,就不允许出现缩孔、缩松和偏析等缺陷。因此,选择合理的浇注系统就很重要。本文就铸钢件顺序凝固原理,对凿岩机气缸和机头浇注系统作一小结。一、气缸的浇注系统YT-26型气腿式凿岩机的气缸,壁厚不均匀,几何形状也较复杂,零件简图见图1。在
In order to meet the needs of the rapid development of mining and excavation work, our factory produced a YT-26 pneumatic leg rock drill. The main parts of the machine are the precision casting process of the cylinder and the head. During operation, the host of the rock drill is subjected to multiple shocks of alternating loads and high impact frequencies (f=2000 times per minute). In the case of cylinders, due to the reciprocating movement of the piston, high local pressure and relative wear occur during operation. From the casting point of view, defects such as shrinkage, shrinkage, and segregation are not allowed. Therefore, it is important to choose a reasonable gating system. In this paper, a brief summary of the principle of sequential solidification of steel castings is given for the rock drill cylinder and the head casting system. First, the casting system of the cylinder YT-26 pneumatic leg rock drill cylinder, the wall thickness is not uniform, the geometry is also more complex, the schematic diagram of the parts shown in Figure 1. in