Hobbing uses a hobbing machine with two skew spindles, one mounted with a blank workpiece and the other with the hob. The angle between the hob's spindle (axis) and the workpiece's spindle varies, depending on the type of product being produced. For example, if a spur gear is being produced, then the hob is angled equal to the lead angle of the hob; if a helical gear is being produced then the angle must be increased by the same amount as the helix angle of the helical gear. The hobbing features for gears are straight, helical, straight bevel, face, crowned, worm, cylkro and chamfering. The two shafts are rotated at a proportional ratio, which determines the number of teeth on the blank; for example, for a single-threaded hob if the gear ratio is 40:1 the hob rotates 40 times to each turn of the blank, which produces 40 teeth in the blank. If the hob has multiple threads the speed ratio must be multiplied by the number of threads on the hob. The hob is then fed up into the workpiece until the correct tooth depth is obtained. Finally the hob is fed through the workpiece parallel to the blank's axis of rotation. Gear Hobbing,Hobbing Machine,Gear Hobbing Machine,Hobbing Machine Price Jiangsu Hoston Machine Tools Co., Ltd. , https://www.haostonmachinetools.com
Often, during mass production multiple blanks are stacked using a suitable fixture, then cut in one operation.
For very large gears the blank can be gashed to the rough shape first to make hobbing easier.
Shaanxi Automobile Group's new smart environmental muck is in Xi'an
On March 10th, the new intelligent environmental protection slag truck of Shaanxi Automobile Group was unveiled on the production line. The new intelligent environmental protection slag truck largely solved the shortcomings of the previous slag trucks with low emission standards, large exhaust gas volume, and poor sealing of the tank. From the three aspects of environmental protection, intelligence, and safety have been greatly improved. On the same day, the 2015 Xi'an Construction Vehicle Safety Transport Cooperation Collaboration Conference was held at the Northern Suburbs of Shaanxi Auto. From this year, Shaanxi Automobile's new intelligent environmental protection slag truck will be put into the national market, 10,000 vehicles, and gradually replace the non-compliance of the slag.
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