Hobs enable precision gear processing and are widely used in automobiles, construction and industrial machineries, as well as for processing of power transmission gears in marine vessels and aircrafts.
Processing can be designed according to your selection of outer diameter, overall length, bore diameter, number of gash as well as optimum assembly of tool and material coating. This selection includes various lineups for arc other than involute gear and non-involute gear such as cycloid and sprocket gears.
Moreover, small sized shank hob, large sized gash mill cutter can be also be processed.
Dry cut by high hobbing that features our "SuperDry coating" applied to the cutting face makes improvement not only in the work environment that requires no cutting oil but rapid processing even at a cutting rate of 250 m/min.or more is possible, achieving highly effi cient processing with multiple starts.
SuperDry III Hob
- In comparison to SuperDry II, it has enhanced the tolerance temperature rate over oxidation to prevent reduction of coating hardness at high temperatures and to further strengthen wear and tear resistance.
- Improvement in coating structure raises coating strength and bonding power by increasing adhesion with the base material.
Example of processing
Picture illustrating wear after processing 80 units of work pieces
Processing by hobbing
Mount a hob on the hobbing machine, position the hob and the work piece in rack and pinion order, perform synchronous rotation, and feed the hob to work piece’s gear width direction; this enables highly efficient and accurate gear processing.
Gear cutting method in hobbing
Precaution for sharpening
Hob needs grinding as cutting edge surface may become worn; this process is called "Resharpening". Improper resharpening may affect the precision of the hob. Following indicates the typical example of errors in the cutter form:
Δγδ＝hobbing lateral face lip clearance (tanΔγδ＝tanε・tanαn・cosγ),
ε＝external lip clearance
αn＝tooth pressure angle
γ＝hobbing feeding angle,
rρ＝hobbing pitch circle diameter
Influence from cutting load fluctuation
Hob setting angle error and tooth thickness
Number of starts and polygonal error
Business contact: Strategic Sales Operation Department