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20CrMnTi汽车齿轮加工路线如下:“下料——模锻——正火——粗加工、半精加工(内端面留磨量)——渗碳(防渗)、淬火、低温回火——喷丸——校正花键——珩齿磨齿”,请说出工艺路线中各种热处理的作用。
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