Study of Shearing Temperature on Characterization and Quality of Sheared Edge of SUS304 Austenitic Steel

Main Article Content

Natthasak Pornputsiri
Pongsakorn Leetrakul

Abstract

This research aims to investigate the characteristics and quality of the cutting edge of SUS304 stainless steel sheet with 1 mm thickness by hot shearing process. The shearing test was carried out with a circular blanking die with a diameter of 20 mm and the cutting clearance set at 8 percent of the sheet metal thickness. On the pre- blanking, the sheet metal was heated in an electric furnace at 4 temperature levels, consisting of room temperature, 200, 400, and 600 °C. The verification of the characteristics and cutting edge quality of finished blank was determined by region height values on the cutting edge using an optical macroscope, optical
microscope and scanning electron microscope. A Vickers hardness tester was used to investigate the micro-hardness of the specimen cutting edge to assess the strain hardening after shearing. The results showed that sheet metal sheared at room temperature had the
highest fracture region on the cutting edge and a tendency to deteriorate when the sheet metal temperature increased. At the same time, roll over regions, shear surface regions and burrs tended to increase with an increase in the shearing temperature which was in relation to the hardness test results at the cutting edge. This is because the strain hardening index decreases with increasing temperature. Based on the findings, this experimental data can be applied to determine the optimum shearing temperature conditions for stainless steel sheet metal blanking which is determined by the relationship between the sheet metal temperature which directly affects the finished cutting edge quality.

Article Details

How to Cite
[1]
N. Pornputsiri and P. Leetrakul, “Study of Shearing Temperature on Characterization and Quality of Sheared Edge of SUS304 Austenitic Steel”, RMUTI Journal, vol. 15, no. 1, pp. 24–37, Apr. 2022.
Section
Research article

References

Kumar, S. Singh, R., and Sekhon, G. S. (2008). An Expert System for Design of Blanking Dies for Sheet Metal Operations. In Proceedings of the World Congress on Engineering and Computer Science 2008. WCECS 2008, October 22 - 24, 2008,

San Francisco, USA

Brun, M., Ghiotti, A., Bruschi, S., and Filippi, S. (2021). Active Control of Blank Holder in Sheet Metal Stamping. Procedia CIRP. Vol. 100, pp. 151-156. DOI: 10.1016/j.procir.2021.05.079

Pickering, F. B. (1984). Physical Mettallurgical Developments of Stainless Steels. Stainless Steels. Vol. 84, pp. 2-28

Lo, K. H., Shek, C. H., and Lai, J. K. L. (2017). Recent Developments in Stainless Steels. Materials Science and Engineering. Vol. 65, pp. 39-104. DOI: 10.1016/j.mser.2009.03.001

Juthamas, C., Monsiri, O., and Phrompong, S. (2015). Improving the Productivity of Sheet Metal Stamping Subassembly Area Using the Application of Lean Manufacturing Principles. Procedia Manufacturing. Vol. 2, pp. 102-107. DOI: 10.1016/j.promfg.2015.07.090

Mori, K., Abe, Y., Kidoma, Y., and Kadarno, P. (2013). Slight Clearance Punching of Ultra-High Strength Steel Sheets Using Punch Having Small Round Edge. International Journal of Machine Tools & Manufacture. Vol. 65, pp. 41-46. DOI: 10.1016/j.ijmachtools.2012.09.005

Wang, W. Y., Liu, B., and Kodur, V. (2020). Effect of Temperature on Strength and Elastic Modulus of High-Strength Steel. Journal of Materials in Civil Engineering. Vol. 25, pp. 174-182. DOI: 10.1061/(ASCE)MT.1943-5533.0000600

Tang, Z., Huang, J., Ding, H., Cai, Z., Zhang, D., and Misra, D. (2018). Effect of Deformation Temperature on Mechanical Properties and Deformation Mechanisms of Cold-Rolled Low C High Mn TRIP/TWIP Steel. Metals - Open Access Metallurgy

Journal. Vol. 8, p. 476. DOI: 10.3390/met8070476

Schuler, G. (1998). Metal Forming Handbook. Schuler GmbH, Springer, Berlin, Heidelberg. p. 568

Keawtatip, P., Masahiko, J., and Murakawa, M. (2012). Side Load on Punch and Die of Blanking Die by FEM. In The 14th Conference of Mechanical Engineering Network of Thailand (ME-NETT2012). Phuket. Thailand, pp. 250-256

Totre, A., Nishad, R., and Bodke, S. (2008). An Overview of Factors Affecting in Blanking Processes. International Journal of Emerging Technology and Advanced Engineering. Vol. 3, Issue 3, pp. 390-395

Fazily, P., Yu, J., and Lee, C. W. (2019). Characterization of Sheared Edges in Warm Blanking of Magnesium Alloy AZ31B. Materials. Vol. 12, p. 1023. DOI: 10.3390/ma12071023

Nikulin, I., Kaibyshev, R., and Skorobogatykh, V. (2010). High Temperature Properties of an Austenitic Stainless Steel. Journal of Physics: Conference Series. Vol. 240, pp. 01-04

Horak, J. A. and Sikka, V. K. (1983). Review of Mechanical Properties and Microstructures of Types 304 and 316 Stainless Steel After Long-Term Aging. Scientific & Technical Information Technical Reports. pp. 179-213