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Quasi-dry machining is a new type of machining that replaces traditional lubrication cooling with a small amount of lubrication. It has been applied in some enterprises. Under the condition of dry cutting, the cutting process is different from the traditional wet cutting. For example, the feed speed, cutting depth and cutting speed are different from the traditional cutting. The main performance is that the cutting edge of the cutting tool generally adopts a negative chamfering protection edge. The cutting principle involves a wider range of factors. At present, the theoretical basis of quasi-dry cutting is far less mature than the traditional metal cutting theory, and it is difficult to analyze the processing mechanism of quasi-dry cutting with a theory.
Hobbing machining has a certain degree of specificity in terms of cutting motion, and it has in common with the theory of dry machining and the cutting mechanism. The cutting theory includes: green cutting theory, softening theory of metal during cutting, low temperature brittleness and improved cutting cooling. The specific contents are as follows: (1) theoretical analysis of the cutting force when the cutting tool edge is worn and not worn; (2) the cause of the sawtooth chip; (3) the metal softening effect; (4) the roughness quality of the machined surface (5) MQL cooling lubrication effect. Around these theories and specific content, we can guide us to better refer to the quasi-dry machining to the hobbing process, so as to achieve good machining results, longer cutting tool life, and a clean machining environment.
In order to achieve good machining results, the general idea of ​​hobbing machining using quasi-dry cutting is to increase the cutting speed, shorten the contact time between the cutting tool and the workpiece, and let the chips take away a lot of cutting heat; And minimal lubrication technology. The idea is based on the fact that most of the cutting energy is converted into heat, which is expected to be carried away quickly by the chips, while the heat transferred to the cutting tool and the workpiece is minimized. In this way, it is advantageous to extend the life of the cutting tool and reduce the thermal expansion of the workpiece. In high-speed hobbing, even in the ideal case, a small amount of cutting heat is absorbed by the cutting tool. From the current application, the cutting heat of the cutting tool is cooled by the compressed air, and the heat dissipation effect is obvious. Will achieve better processing results.
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