一、前言 12V180型高速柴油机工作强化后,活塞热负荷增大。为了不使活塞环槽温度过高(如第一环槽温度在220℃以下),活塞顶内设有圆环状的内冷油路和进出油孔(见图1)。用低压铸造方法生产这种活塞时,曾经采用过将成形铜环铸入活塞内形成油路的方法。但这种方法存在许多缺点,首先是用铜管制作油路,会形成脆性铜——铝 I. Introduction 12V180-type high-speed diesel engine to strengthen the work, the piston heat load increases. In order not to make the piston ring groove temperature is too high (such as the first ring groove temperature below 220 ℃), the piston top is equipped with a ring-shaped internal cooling oil and oil into the hole (see Figure 1). In the production of such pistons by low-pressure casting, a method of casting a formed copper ring into a piston to form an oil passage was used. However, this method has many shortcomings, the first is the use of brass oil production, will form a brittle copper - aluminum