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Why Did My Knife Chip or Dull, and How to Fix It

What causes chips and rapid dulling on Japanese knives, and how to grind out a chip and restore the edge on a whetstone.

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From the Knives and Stones workshop

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Restoring a badly sharpened Japanese knife: the cause and the fix. You probably seen one before

Fixing a Japanese Knife Chip, Cheap as Chips

Questions about this

為什麼我的日本刀會崩刃或變鈍?該如何修復?

刀刃崩口幾乎都是硬物碰撞所致:例如骨頭、冷凍食品、陶瓷盤,或是刀鋒敲到水槽或玻璃砧板。至於快速變鈍,通常不是正常磨損,就是研磨角度過陡或不一致,且刃面從未徹底精修完成。

若要修復崩刃,請使用粗磨石研磨刀刃,直到整段刀刃的缺口完全消除,接著再逐步換用較細的磨石進行修整,以恢復平整俐落的刃面。這個過程雖然會磨耗掉少許鋼材,但若對崩刃置之不理,受損的刀刃只會持續惡化。

Knives and Stones 岩刃社觀點:以 400 目磨石(例如蝦印 Chosera 400/1000/3000 階梯組合中的 400 目)負責重度修復,再由 1000 目及以上進行精修。請搭配 Atoma 鑽石整平板維持磨石平整,確保修復後的刀刃保持精準平直。

✓ Verified by Knives and Stones · James Zhang · Reviewed 3 Jun 2026

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