Conventional Technology for crankshaft manufacturing process

 

A majority of the existing induction crankshaft hardening machines require the crankshaft rotation during heating. Each crankpin and main journal is heated by bringing a "U-shaped" inductor close to the crankpin or main bearing surface while the crankshaft manufacturing process rotated about its main axis.

Since the crankpin axis is offset radially from the main axis, the crankpin will orbit around the main axis. The crankshaft's rotational speed varies between 24 and 32 rpm; consequently, the "U-shaped" inductor, as well as other massive components of the induction hardening machine including output transformer of power supply, busswork, cables, etc. must travel with the orbital motion of the crankpins.

The circular orbital motion of such a heavy system must be maintained precisely, resulting in the complex, sensitive, bulky, noisy and costly design of the conventional induction hardening machines.

Equipment maintainability, reliability and harden pattern repeatability are among other concerns expressed by users of the existing technology. In particular, the short coil life was a dilemma. There are several factors that led to short coil life while using refrigeration compressor crankshafts in germany hardening technology:

The first machine has been built for one of the world's leading automotive manufacturers and a second machine is under construction. The advantages of the non-rotational system over the conventional hardening systems were recognized immediately by the customer's materials, manufacturing and quality engineers. Some of these features include.