CNC machining metal parts will show different color residues when they reach a certain temperature. How can custom machining manufacturers judge the degree of CNC machining from the color of metal scraps? This article uses iron filings as an example to talk about color changes in CNC machining.
Why do custom machining manufacturers say that the color of metal chips can judge the state of CNC machining?
When custom machining manufacturers process metal parts, as the cutting temperature increases, the color of the metal chips will also change. The temperature reached can be judged, and the degree of tool wear can also be predicted, so adjust the appropriate speed and feed quantity.
The color change law of iron filings
When custom machining manufacturers mahcining iron parts, as the cutting temperature increases, the color of iron filings during dry cutting changes as follows: silver white → light yellow → dark yellow → magenta → dark blue → blue → blue gray →Off-white →purple black. The temperature change can rise from about 200°C to over 500°C.
The relationship between chip color and cutting temperature of custom machined parts:
Silver white: <200℃ below
Light yellow: ≈220℃
Dark blue: ≈300℃
Light gray: ≈400℃
Deep purple black: >500℃
Summarize
When custom machining manufacturers machining parts, it is more reasonable when the cutting color of metal chips is blue or blue-violet. If it is silver or yellow, the efficiency is not fully utilized, and if it is blue and gray, the cutting amount is too large. Use high-speed steel cutting tools, it is advisable to cut to silver and yellowish, if cut blue, reduce the speed or feed.