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Introduction about the gear hobbing machine
A gear hobbing machine is a special form of milling machine that cuts gears. It is the major industrial process for cutting (as opposed to grinding) spur gears of involute form.
The machine forms the gear via a generating process by rotating the gear blank and the cutter (called a hob) at the same time with a fixed gearing ratio between hob and blank. The hob has a profile given in cross-section by the fundamental rack for the gear tooth profile and is in the form of a helix so that the sides of the teeth on the hob generate the curve on the gear. The helix has a number of cuts parallel to the axis to form the cutting teeth and the profile is suitably relieved to provide cutting clearance.
For a tooth profile which is a theoretical involute, the fundamental rack is straight-sided, with sides inclined at the pressure angle of the tooth form, with flat top and bottom. The necessary addendum correction to allow the use of small-numbered pinions can either be obtained by suitable modification of this rack to a cycloidal form at the tips, or by hobbing at other than the theoretical pitch circle diameter. Since the gear ratio between hob and blank is fixed, the resulting gear will have the correct pitch on the pitch circle, but the tooth thickness will not be equal to the space width.
Hobbing is invariably used to produce throated worm wheels, but it is not possible to cut all useful tooth profiles in this way; if any portion of the hob profile is perpendicular to the axis then it will have no cutting clearance generated by the usual backing off process, and it will not cut well. The NHS Swiss tooth standards give rise to such problems. Such small gears normally must be milled instead.
Function about the gear hobbing machine
Gear-hobbing machines use a rotating, multiple-tooth cutting tool called a hob for generating teeth on spur gears, worm gears, helical gears, splines, and sprockets. More gears are cut by hobbing than by other methods because the hobbing cutter cuts continuously and produces accurate gears at high production rates.
Hobbing is a machining process for making gears, splines, and sprockets on a hobbing machine, which is a special type of milling machine. The teeth or splines are progressively cut into the workpiece by a series of cuts made by a cutting tool called a hob. Compared to other gear forming processes, it is relatively inexpensive but still quite accurate, thus it is used for a broad range of parts and quantities.
It is the most widely used gear cutting process for creating spur and helical gears and more gears are cut by hobbing than any other process since it is relatively quick and inexpensive.
Features about the gear hobbing machine
1. By continuous indexing, it is suitable to cut cylindrical spur, helical geras and sprockets under axis feeding.
2. It can also cut worm wheels by a worm-wheel hub under radial feeding.
3. Machine feeding by manual.
4. It is suitable for mine, oil, ship, engineering mechanism industries for making large gears.
5. Tangential hob head is also available for special order to cut worm wheels under tangential feeding mode.
Technical parameters about the gear hobbing machine
Max workpiece diameter(with rear column/without rear column)
Max hobbing modulus
Max Processing Width
Min processing gear
Max vertical travel of tool post
max swiver angel of tool post
Distance between cutter axis and worktable
Max Dia 245MM
Max Dia 180MM
Min length 220MM
Min length 180MM
Max axial movement of cutter
Hob abor diameters
Distance between hob axis center and worktable
Taper bore of workpiece mandrel
Spindle rotate speed and range
Rapid travel speed of tool post slide
Worktable rapid moving speed
Distance between worktable and outer support of axis face
Axial feed rate and degree
main motor power and synchro-speed
Axial rapid motor power and synchro-speed
Worktable rapid motor power and synchro-speed
Hydraulic oil pump power and synchro-speed
Cooling pump power and synchro-speed