齿顶牙顶
The top of the tooth
以上为机器翻译结果，长、整句建议使用 人工翻译 。
结果表明，牙顶处金属材料受到丝锥棱齿的压力相对较小，并且金属流向牙顶两侧上方的区域时受到的阻力最小；
Through metallographic analysis of the material, microstructure change and deformation mechanism of crest, flank and root of the thread along the layer depth direction were obtained.
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