Method for Marking a Tool

Abstract

A method is provided for marking a tool. The method includes the steps of providing a dented mark in the tool, providing a first protection layer on the tool except the dented mark, and providing a second protection layer on the first protection layer. The first and second protection layers are made of colors that are selected so that when there is a scratch in the second protection layer, a color shown in the scratch is similar to the color of the second protection layer.

1 . A method for marking a tool including the steps of providing a dented mark in the tool, providing a first protection layer on the tool except the dented mark, and providing a second protection layer on the first protection layer, wherein the first and second protection layers are made of colors that are selected so that when there is a scratch in the second protection layer, a color shown in the scratch is similar to the color of the second protection layer. 
     
     
         2 . The method according to  claim 1 , wherein the color of the first protection layer is at least similar to that of the second protection layer. 
     
     
         3 . The method according to  claim 2 , wherein the first protection layer is a black film of manganese phosphate provided by bonderizing, wherein the protection layer is a black film provided by dying. 
     
     
         4 . The method according to  claim 1 , wherein the first protection layer is transparent while the color of the second protection layer is at least similar to that of the tool. 
     
     
         5 . The method according to  claim 4 , wherein the first protection layer is a transparent film of zinc phosphate provided by bonderizing while the protection layer is a metallic film provided by electroplating. 
     
     
         6 . The method according to  claim 1 , wherein the color of the first protection layer is at least similar to that of the tool while the second protection layer is transparent. 
     
     
         7 . The method according to  claim 1 , including the step of subjecting the bit to heat treatment after the step of providing the dented mark on the tool. 
     
     
         8 . The method according to  claim 1 , further including the step of filling colorant in the dented mark. 
     
     
         9 . The method according to  claim 8 , wherein the colorant is in strong contrast to the tool and the first and second protection layers. 
     
     
         10 . The method according to  claim 8 , including the step of removing a redundant portion of the colorant from the tool. 
     
     
         11 . The method according to  claim 1 , including the step of providing a third protection layer on the second protection layer.