Mattias Söderholm

Use of Barkhausen Noise for Grinding Quality Control: Industrial Production of Camshafts for Heavy Truck Engines Mattias Söderholm

In today?s industry, there is a demand for a continuously increasing productivity and very short payoff times on investments, with no room for redundant production capacity. Because of this, processes with hard to control parameters can become more unstable when the productivity demand increases. One such process is the production of forged, case hardened camshafts for heavy truck diesel engines. To insure quality, some sort of quality control tool must be used. The purpose of this work has been to verify if the Barkhausen Noise method can be used as a production control method for the grinding operation. However, actual production camshafts have been used to include the normal production variations of preceding operations in the evaluation. In the book, the Barkhausen Noise principles, the effect of different parameters, and some grinding applications are described. Experiences from production tests done at Scania are discussed. Then the part and equipment used, and the tests done for this work are presented and discussed. The book should be helpful for companies who intend to start using the method for grinding quality control.