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Now hobbing can replace the casting lubrication of cutting oil with a small amount of lubrication. The outstanding advantages are: saving operating costs, low fuel consumption, improving the working environment, and improving processing efficiency.
Features of gear hobbing micro-lubrication technology: High-speed machining under oil mist-type micro-lubrication ensures long life of cutting tools, mainly because ultra-fine oil mist particles help to penetrate into the cutting area to form oil film, reducing “tool-workpiece†The friction between the "tool-chip" acts to suppress temperature rise, reduce tool wear, prevent sticking, and improve workpiece processing quality and tool life. When the oil mist type is used for micro-lubrication, the cutting tool is always in the stable cutting temperature range, and there is no repeated thermal shock when using the cutting fluid, so that the chance of forming micro-cracks in the cutting tool is reduced, and micro-cracks formed by various cutting tools are not caused. Lead to chipping, peeling of the coating, etc., affecting tool life. Since the cutting temperature in the case of micro-lubrication is higher than that of the cutting fluid, the chips are more likely to form the bean paste and the short chips quickly leave the cutting area, and the cutting heat is taken away in large quantities.
The hobbing machine tool uses the idea of ​​approximating the dry cutting technology: increasing the cutting speed, shortening the contact time between the cutting tool and the workpiece, and allowing the chip to take away a lot of cutting heat; supplemented by a small amount of lubrication technology.
High-speed hobbing in the approximate dry-cut condition is the same as dry-cutting. Most of the cutting heat is mainly carried away by the chips, and 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. When high-speed hobbing, there is always a small amount of cutting heat 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, mainly because the hobbing process involves cutting. The cutting teeth are uninterrupted, making the cutting heat concentrated on a single cutting tooth for a very short time. This is very beneficial for the application of micro-lubrication in hobbing. The factors affecting the cutting temperature and the workpiece temperature during the cutting process are mainly the ambient temperature and the original temperature of the workpiece.
The micro-lubrication hobbing processing can consistent with the cutting oil state in terms of the accuracy of the tooth shape, the accuracy of the tooth direction, the length of the common normal line, etc., and meet the process requirements.
Hobbing processing cooling lubrication new method
Gear hobbing currently uses cutting oil for cast lubrication. This type of lubrication has some disadvantages: large oil consumption, harsh operating environment, oil mist in the air, and high power consumption.