Razvoj metode za inteligentno napovedovanje tehnoloških parametrov upogibanja pločevine v dveh stopnjah : doktorska disertacija

slovenian

doktorska dela

2013

Univerza v Mariboru, Fakulteta za strojništvo

This doctoral dissertation scientifically describes the area of bending in twostages for 90° angle and more in multi-stage progressive tools, which has not been well-known and not been investigated in further detail yet. The mentioned type of bending is a process where, in the first stage, the sheet metal is pre-deformed to the pre-bending angle and then, in the second bendingstage, the sheet metal is bent to the final bending angle. The main part of the thesis is devoted to the development and implementation of the method for intelligent prediction of technological parameters. In order to apply the intelligent method successfully, we examined the bending processes and investigated and analysed bending in two stages in detail. An important aspect of a satisfactory application of the method was also the developed and built test tool for bending sheet metal. Tests were performed on the test toolusing various types of sheet metals. In monitoring the process of sheet metal bending, we measured and recorded the following parameters: pre-bending angle, die shift in the second bend, sheet metal thickness, yield strength, tensile strength and final bending angle. After a thorough analysis and verification of measured parameters, we used the artificial intelligence-neural network to implement the intelligent methods for prediction of the final bend angle, shift of the die in the second bend and the pre-bending angle in the process of bending in two stages. The intelligentmethod increases the quality of the procedure application and reduces the number of tests. On the basis of the method for predicting technological parameters, the procedure can be easily applied to multi-stage progressive tools for sheet metal forming. The developed intelligent method for predicting the final bend angle, the shift of the die in the second bend and the pre-bending angle allows its users to apply the procedure in an economically efficient and technically simple manner.

08.08.2023