Effect of Coating Film on Tool Life of High Speed Steel Hob in Dry Gear Hobbing

概要

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This paper presents the results of practical dry hobbing experiments performed on a traditional productive type of hobbing machine. The HSS (high speed steel) hobs with different combination of coat materials and coating states display significant variations in tool life. A TiN coating hob demonstrates the best cutting performance although the coating cost is the lowest. From these experimental results, two meaningful conclusions are obtained. One is some coat materials proper to HSS milling cutters are not always suitable for a HSS hob applied in dry hobbing. The other is that for a coated HSS hob, a cutting performance and tool life satisfactory to practical application is possible when using the hob to carry out dry hobbing on a general type of hobbing machine, if the coat film on the hob teeth is proper both in material and coating form.