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本文针对油冷却器所用小直径厚壁换热管的特点,对常规胀管工艺进行了改进,利用二次胀管,以达到必要的胀紧度。图4表1。
In this paper, according to the characteristics of small diameter thick-walled heat exchange tubes used in oil coolers, the conventional expansion process is improved, and the secondary expansion is used to achieve the necessary expansion tightness. Figure 4 Table 1.