In one of the past materials, we presented an overview of the manufacturing video saw blades. Such a knife has a blade thickness of 3 mm and if it is warmed up to the desired temperature and sharply cooled for hardening, then most likely the blade will be unscrewed into the propeller, or the knife will simply burst. Therefore, we offer a video review on the hardening of such a knife in graphite. According to the author of the idea, quenching in graphite has the advantage that heating is required only on the cutting edge of the blade.
And we will begin training by watching the author’s video
We will need:
- direct current source;
- some salt;
- water;
- graphite in powder form;
- a small piece of rag;
- metallic profile.
Graphite can be obtained from brushes used in construction tools, as well as from finger batteries. We also note that it is advisable to use a non-synthetic rag. As for the metal profile, it will be used to make the case, and it can be replaced with a corner if desired.
We take the profile and connect it to the positive terminal of the DC source.
Then we take a little salt and dissolve it in water.
After dissolving the salt in water, wet a rag to it. This is necessary in order to create a kind of fuse between the metals in order to avoid the accidental touch of the knife on the metal workpiece, since in this case a direct arc will occur, as a result of which the metal of the knife will deteriorate.
Press the rag and put in a metal profile.
We fall asleep on a rag graphite.
We connect the blade to the negative wire, after which it is possible to begin hardening.
