激光硬化层
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laser hardening case
激光硬化外壳
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The three key techniques for laser surface hardening of gear have been proposed in this paper. With using these techniques, an uniform hardened case along the flank of gear has been obtained easily.
提出了齿轮激光表面强化的偏置技术、变速扫描技术和辅助冷却技术，因而，获得了沿齿廓分布的均匀硬化层。
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