Transmission Shafts ---------
||CNC Shaping/Thread Rolling/Induction Annealing/Grinding
||SCM415/420, High Carbon High Chrome Steel
||Case Carburizing/Carbo-nitriding/Hardening & Tempering
GRINDING (For shaft only): In general, OD grinding is performed either between centers or on a centerless grinding machine. When the features of the gear shafts require both grinding operations, they are usually done sequentially on purpose-built machine tools.
Primarily a shop uses these grinding operations because of specific strengths inherent in each. For between center work, a work piece that has a critical concentric feature such as a cam lobe or gear or crank pin is processed between centers because the relative positions to the shaft diameter can be maintained.
Centerless grinding, on the other hand, is best applied for creating roundness. The process is self-correcting for most out of round conditions. It is limited, however, in its ability to maintain concentricity between the shaft diameter and a lobe, gear or pin.
THREAD ROLLING (For shaft only): In this process circular thread rolling die penetrate the screw blank at a controlled rate until full depth of thread roll profile is reached.
INDUCTION ANNEALING: Annealing process consists of three stages. First, the metal part is placed inside an induction coil and power is supplied until the part reaches the correct temperature. The temperature can be checked with an optical pyrometer, temperature sensing paint or some other temperature-sensing device. The second stage is holding or soaking at the correct temperature, which can be accomplished with a closed loop temperature control system. The annealed part must then be allowed enough time to cool down to room temperature.
STRAIGHTNING (For shaft only): In this process we remove the bend of long shaft which occur during heat treatment process. A pneumatic press and an anvil are mounted in such a way that we apply the load opposite to the maximum bend portion.