Gear Hobbing
Buyer's Guide to Gear Hobbing
Following points can prove to be useful while going for a gear
hobbing process:
- Always choose the premium quality tools.
- Remember to regrind tools correctly.
- Ensure the availabilty of correct equipment in a good
condition.
- Apply correct hob shift strategy.
- Use a correct, proper cutting data and apply lubricants
(unless dry machining).
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Gear hobbing is considered to be the most productive and viable of
all a generating process. With Gear hobbing process toothed wheels of gears
are manufactured with high quality and gives excellent performance.
However, Hobbing is only used to produce spur and worn gears. Internal
gears or shoulder gear cannot be worked up in Hobbing process.
The hobbing process works like this. The hob is applied for generating the
involute teeth. The hob is essentially a cylindrical tool which is
positioned straight. In hobbing process the hob as well as the workpiece
rotate continuously displaying a rotational relationship. A thread having
the similar cross section as that of rack tooth is helically wound around
the Hob. The Hob is then subsequently rotated. The gear blank is fed onto
the hob based on the depth of cut. The helix pattern of a rotating hob is
identical to that of a moving rack. Gear hobbing is an efficient process
however it comes with complicated process kinematics, and some how difficult
tool wear mechanisms.
Advantages of Gear Hobbing Process
- High productivity rate
- Economical and efficient operation
- Accuracy
- Close tolerances
- Versatility of operations
- Smooth finishes
Gear Hobbing Machines
There are different varieties of Gear Hobbing Machines. These machinces are
used in effective production of accurate Spur, Helical, Worm Gears,
Sprockets etc. These machines are manufactured with certain features such as
follows:
- Gears and shafts of Alloy Steel.
- Oil reservoirs, to ensure proper lubrication of gears and bearings.
- Bed and Column of Close Grain Casting, perfectly ribbed with 'V' type
guide ways.
- Oil reservoirs provided to ensure through lubrication of gears and
bearings.
- Indexing Worm Wheel made of high grade Bronze material.
