Mätning av abrasivflöde för vattenskärningsmaskiner
The content of the following report is the summarized result of three students thesis at Blekinge Institute of Technology in co-operation with Water Jet Sweden AB. This report will give the reader a description of principles how to measure the abrasive mass flow in a waterjet cutting system. The work began with a visit to Water Jet Sweden AB to get a closer look at the problem. When the analysis of the problem was done the criteria were defined in the form of demands and desires. The main task of the criteria was to guide the search for the solution. The work proceeded with an extensive search for abrasive flow meters along with obtaining information about flow measurement in general. When the search for abrasive flow meters resulted in nothing all the efforts were concentrated on finding a principle of measurement that could cope with the criteria. A number of commonly accepted principles for measurement of mass flow was studied and evaluated. Those passing the evaluation were subject to another more extensive review. In this review the only conclusion was that none of the principles could be dismissed without practical testing. Water Jet Sweden AB were asked which principle/principles of measurement they were most interested in. After coming to an agreement two closely related principles of measurement were chosen to undergo practical studies. A number of different abrasive flows were simulated and in some cases a distinct variation of the signal value could be observed. Everyone involved in this project knew from the beginning that it was extensive. Even though no prototype was presented, this work represents a good foundation for future development.
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