What is the most suitable cutting tool for hard turning gear
Gearbox, as one of the most important component for the car, usually work with high speed and load condition. In order to obtain long tool life and ensure the good quality, the manufacturer usually use heat treatment to deal with the materials.
The gearbox will have high hardness after heat treatment, normally it will exist the following problems:
(1)The hardness of the gearbox will be HRC58~62, if using traditional cutting tools(carbide insert, ceramic cutters and coating carbide insert), frequently changing the insert will affect the production efficiency.
(2)Some gearbox will exist interrupt turning condition(some working site has oil hole or keyway,ect ), traditional cutting tools will be easily chipping, which will make the production costs very high.
Specific for above problems, the manufacturers use grinding process to make sure the tolerance and surface requirements. But with the development of the society and the cutting tools materials, “Turning instead of Grinding” appears. And it will require strictly on the cutting tools performance, especially for the size and roughness requirements. In the past, when meet interrupt turning condition, most customers only use famous brand cbn inserts. Specific for this situation, Halnn researched 2 cbn grades BN-H10 (continuous turning ) and BN-H21 (interrupt turning) pcbn insert for hard turning gearbox, and both of them perform well in hard turning process. We also can offer coating service for some special requirements.
The following will share you one application case of hard turning gearbox with Halnn BN-H21 pcbn insert:
Workpiece name:Gears in Gearbox
Diameter:50mm
Workpiece Materials:20CrMnTi(SMK22)
Hardness: Heat Treatment
Machining Condition: Interrupt Turning
Insert Models:BN-H21 TNGA160408(which can replace Kyocera KBN525M)
Cutting Speeds and Feeds: N=950r/min,ap=0.25mm
Machining Effect: It will not chip when meet interrupt turning condition, and the tool cost on each workpiece reduce.
If you would like to know more details on hard turning with Bn-H21 pcbn insert, please feel free to contact with us info@halnntools.com