Swedish Powertrain is a major sub supplier for Commercial Vehicles, Mining & Construction, Agriculture and General Industry. For several produced parts there is a need of Heat Treatment in some way. Swedish Powertrain has historically focused in induction hardening and we process and refine approximately 300 000 parts per year. Since 2011 furnace hardening, case and neutral, is also performed within the group which has increased our possibilities to provide our customers with world class services/parts. From 2018 we also have capabilities of Low Pressure Carburising (LPC) which offers reduced distortion of the parts.
Swedish Powertrain has ten Low-Medium frequency hardening machines and two, newly invested, high frequency machines. Both horizontal and vertical hardening can be performed.
In our equipments we are able to:
- Create induction depths, DI, between 0,5 mm and 20 mm
- Refine parts with a diameter up to 400 mm and lengths up to 2000 mm
In a unique low frequency machine single shot shafts up to 1100 mm of length creating superior tensile properties towards the normally used scanning method.
The induction process
With the induction process we can make partial or whole treatment of parts with medium carbon content. The benefit of only treating the areas that need higher tensile properties is that the rest of the part will not be affected regarding distortion. Swedish Powertrain can also offer follow up operations after heat treatment such as straightening, crack detection and hard turning and grinding.
Furnace hardening equipment
In the group we have five atmosphere batch furnaces for case and neutral hardening in size 9 where we can treat parts up to 700 mm length and maximum 700 kg/batch. We also have two pit furnaces for case and neutral hardening where we can treat parts up to 1400 mm length and 1200 kg/batch. All our furnaces are equipped with the latest technique in order to produce a capable process with full traceability from each batch. Fourteen tempering furnaces support the hardening lines with pre-heating and tempering to requested hardness. All results will be verified in complete, state of the art, material laboratory. The cleanness of parts, before and after hardening, is done in double chamber alkali washers.
The furnace process
With the case hardening process we can make use of low carbon content materials which through the process will get a high tensile surface with a tough core. The benefit of case hardening is that it is possible to maintain high tensile surfaces all over the part. If needed we can isolate certain areas of a part from being carbonized by putting on a special paste. A common thing to do on threads with small xxx. When neutral hardening is performed the parts will be hard all through, from surface to core. Normally the hardness is lower than on case harden parts, ap. 40-50 HRC.
Of course Swedish Powertrain provides follow up operations after heat treatment such as straightening, blasting, crack detection and hard turning and grinding.