Effects of process parameters on cutting speed in wire-cut edm of 9crsi tool steel

This article presents a study on the investigation of the effects of the input parameters on the cutting speed in machining 90CrSi tool steel using wire cut electrical discharge machining (EDM).
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Effects of process parameters on cutting speed in wire-cut edm of 9crsi tool steel International Journal of Mechanical Engineering and Technology (IJMET) Volume 10, Issue 03, March 2019, pp. 644-649. Article ID: IJMET_10_03_067 Available online at http://www.iaeme.com/ijmet/issues.asp?JType=IJMET&VType=10&IType=3 ISSN Print: 0976-6340 and ISSN Online: 0976-6359 © IAEME Publication Scopus Indexed EFFECTS OF PROCESS PARAMETERS ON CUTTING SPEED IN WIRE-CUT EDM OF 9CRSI TOOL STEEL Tran Thi Hong Nguyen Tat Thanh University, Ho Chi Minh city, Vietnam Do Thi Tam, Nguyen Manh Cuong, Luu Anh Tung, Vu Ngoc Pi* Thai Nguyen University of Technology, Thai Nguyen city, Vietnam Le Hong Ky Vinh Long University of Technology Education, Vietnam Nguyen Quoc Tuan Thai Nguyen University, Thai Nguyen city, Vietnam Nguyen Thi Hoa Ministry of National Defence - The Vocational College - No.1 *Corresponding Author. ABSTRACT This article presents a study on the investigation of the effects of the input parameters on the cutting speed in machining 90CrSi tool steel using wire cut electrical discharge machining (EDM). In this work, experiments were performed with factorial design with a total of 32 experimental runs. In addition, the input factors including the pulse on time, the pulse off time, the cutting voltage, the server voltage, the wire feed and the feed speed were carefully selected for the investigation. The effects of this factors on the cutting speed were learned by analysing variance. Moreover, a regression equation to determine the cutting speed was introduced. Keywords: WEDM, cutting speed, factorial design, tool steel machining. Cite this Article: Tran Thi Hong, Do Thi Tam, Nguyen Manh Cuong, Luu Anh Tung, Vu Ngoc Pi, Le Hong Ky, Nguyen Quoc Tuan and Nguyen Thi Hoa, Effects of Process Parameters on Cutting Speed in Wire-Cut EDM of 9crsi Tool Steel, International Journal of Mechanical Engineering and Technology, 10(3), 2019, pp. 644-649. http://www.iaeme.com/IJMET/issues.asp?JType=IJMET&VType=10&IType=3 http://www.iaeme.com/IJMET/index.asp 644 editor@iaeme.com Effects of Process Parameters on Cutting Speed in Wire-Cut EDM of 9crsi Tool Steel 1. INTRODUCTION Wire electrical discharge machining (WEDM) is one of the most useful methods for machining difficult-to-machine materials. As a results, there have been many studies on optimization of WEDM process to find the optimum process factors. To review the works in optimization of WEDM process, Yushi Takayama [1] introduced the latest technology in this area. G. Ugrasen [2] conducted an optimization study on the influence of process parameters on the accuracy, the cutting speedand the volumetric material removal rate in WEDM with molybdenum wire. Besides, M. Durairaj [3] presented an optimization study on calculation of optimum input factors for wire cut EDM of Stainless Steel SS304. In addition, Parameswara Rao [4] proposed optimum input parameters for WEDM brass. There have also been many studies on finding optimum process parameters [5, 6, 7 and 8]. Moreover, many methods have been used to calculate the optimum process parameters. They are simulation method [10], Genetic Algorithm method [11] and experimenal method [12, 13]. This paper presents a study on modelling cutting speed in wire cut EDM of 9CrSi tool steel. In this study, the effect of the input factors including the cutting voltage, the pulse on time, the pulse off time, the gap voltage, the wire feed and the cutting speed on the cutting speed were estimated. Aslo, a regression equation for calculation of the cutting speed when WEDM tool steel 90CrSi was suggested. 2. EXPERIMENTAL WORK For evaluation of the influence of the input factors on the cutting speed, 6 process parameters were carefully chosen (Table 1). In addition, a 2-levels ½ factorial experimental design was chosen and as a result a number of 26-1=32 experimental tests will be conducted. Table 2 shows the machine sand equipments used in the experiment. Table 1 Input factors Parameter Code Unit Low High Cutting voltage VM 3 9 Pulse on time Ton 8 12 Pulse off time Toff 13 18 Server voltage SV 25 35 Wire feed WF 8 12 Feed speed SPD 4.5 5.5 Table 2 Machines and equipments Machine and Equipment Specifications Machine Fanuc Robocut α-1 iA (Figure 1) Wire Brass wire of diameter 0.25 mm (Taiwan) Work-material 90CrSi, cross section of 22x22 mm2 Dielectric fluid Deionised water Roughness measurement Mitutoyo 178-923-2A, SJ-201 (Japan) http://www.iaeme.com/IJMET/index.asp 645 editor@iaeme.com Tran Thi Hong, Do Thi Tam, Nguyen Manh Cuong, Luu Anh Tung, Vu Ngoc Pi, Le Hong Ky, Nguyen Quoc Tuan and Nguyen Thi Hoa Figure 1 Wire-cut electrical discharge machine After conducting the c ...