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Generally, in the dry hobbing process, the high speed steel hob for the coating (TiAlN) requires a line speed of 180 m/min.
Even higher; for the carbide alloy hob line speed requirements up to 300
m/min. In order to realize this high-speed hobbing process, the tool spindle can generally be realized by means of an electric spindle; for the table, a new design of a gear transmission system with automatic clearance elimination is used instead of the traditional worm and worm gear transmission system, LIEBHERR, GLEASON
The company's small and medium-sized high-speed hobbing machine table has adopted torque servo motor technology, and the table speed is above 800 r/min.
(2)
Rapid separation of chips
Due to the high temperature, if the chips cannot be quickly separated from the tool, the workpiece and the machine tool, it is easy to cause thermal deformation and affect the machining accuracy, so the iron filings can be quickly and effectively eliminated. In the dry hobbing process, the high speed hobbing of the hob generally causes the iron filings to quickly leave the tool and the workpiece. Many companies have proposed some machine structure improvement schemes for chip removal problems, such as using gravity to speed up the removal of iron filings, and avoiding the iron filings falling directly on the workbench, and then assisting the high-pressure cold air to achieve the effect of quickly and effectively removing the chips. Have
These companies also use stainless steel heat shields. On the one hand, the stainless steel surface is smooth, which facilitates the removal of iron filings. On the other hand, the stainless steel has a small heat transfer coefficient, which reduces the transfer of iron scrap heat to the workbench and the bed.
(3)
High speed hob
The hob material used for dry hobbing is initially made of hard alloy steel. However, due to the high cost of hard alloy steel hob, the powder metallurgy high speed steel hob and TiAlN coated high speed steel hob developed in recent years have replaced hard. The quality alloy steel hob is used for dry hobbing processing. Lieber Haier in a research report on Carbide dry hobbing, powder metallurgy high speed steel hob (HSS-PM) dry hobbing and conventional high speed hoist (Conv.HSS) hobbing Time and processing costs were compared. The results of comparative analysis show that the dry hobbing has shorter processing time and lower cost than conventional processing; the powder metallurgy high speed steel hob has better dry hobbing effect than the hard alloy steel hob. .
Key technical points of MQL hobbing micro-lubrication processing
(1) High rolling speed