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一、前言 近30多年来来 柴油机发展迅速。在此情况下,活塞受到机械负荷与热负荷大幅度增加。为防止铝活塞顶产生裂纹,其温度不能超过350 ℃～375℃;另外,为保持润滑良好,防止积炭, 不使环槽迅速磨损,第一道环槽温度应控制在200～220℃以下。为此在铝活塞的第一或第一、二道环槽处镶铸奥氏体铸铁耐磨镶圈(以下简称耐磨镶圈),在活塞顶靠镶圈附近用水溶盐芯或电子束焊接制出振荡冷却油道。人们一般把这种活塞称做为振荡油冷活塞。根据冷却油道成形方法的不同,又把这种活塞区分为盐芯活塞与电子束焊接活塞。本文将要研究的是如图1所示的Φ100～200mm盐芯活塞。
First, the preface In recent 30 years, the rapid development of diesel engines. In this case, the piston is subject to a substantial increase in mechanical and thermal loads. In order to prevent the top of aluminum piston crack, the temperature can not exceed 350 ℃ ~ 375 ℃; In addition, in order to maintain good lubrication to prevent carbon deposition, ring groove quickly wear, the first ring groove temperature should be controlled below 200 ~ 220 ℃ . To this end in the first or first aluminum piston ring groove set cast austenitic cast iron wear ring (hereinafter referred to as wear ring), near the ring in the piston ring with water soluble salt or electron beam Oscillation cooling system made of oil. This type of piston is commonly referred to as a vibrating oil-cooled piston. According to the cooling oil channel forming method is different, again this piston is divided into salt core piston and electron beam welding piston. This article will be studied is shown in Figure 1 Φ100 ~ 200mm salt core piston.