Investigation of effects of inverter frequency changes on the specific energy consumption of pipe threading using response surface methodology

Abstract

In the manufacturing sector, energy requirements are increasing day by day. Consequently, energy production costs, which are directly affected by economic development, have risen as a result. Pipe threading operations are carried out on special pipe fitting threading machines. In there, threading is achieved with a low number of revolutions and high torque values. In this study, a novel threading machine was produced with an inverter system and inverter outputs controlled by current transformers and ammeters. The process power index (PI) was measured at 25-50 Hz frequencies. A new energy consumption model unlike any in the literature was created for this type of production line and the necessary calculations were made. Results were evaluated based on static response surface methodology (RSM) and experimental design. The effect of the diameter of the pipe contributed 84% and frequency changes 9%, whereas the effect of the product type was approximately 6%. (C) 2019 Elsevier Ltd. All rights reserved.