Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : orthogonal cutting

Influence of Cutting Speed on Residual Stresses by Machining of AISI 316L

Safa M. Lafta; Maan A. Tawfiq

Engineering and Technology Journal, 2020, Volume 38, Issue 3A, Pages 394-401
DOI: 10.30684/etj.v38i3A.459

RS have an important role in the performance of components and machined structures. The objective of this paper is to study the influence of cutting speed on RS in workpieces that are formed in orthogonal cutting. AISI 316L stainless steel since it has been used in many important industries such as chemical, petrochemical industries, power generation, electrical engineering, and food and beverage industry. Four cutting speeds are selected: (44, 56, 71 and 88) m/min. The alloy was machined by turning at constant depth of cut and various feed rate from (0.065 to 0.228) mm/rev. Residual stresses are examined by X-ray diffraction. The best results of RS obtained are (-3735.28, -1784.95, -330.142, -218.747, -890.758, -2999.632, -2990.401) MPa. Increasing the cutting speed from (44-56) m/min. reduces the compressive residual stress by (21.4 %), while from (71-88) m/min the RS is reduced by (19.3 %). Finally, the RS at cutting speeds are changed from compression to tension

Experimental and FEM Study of Coated Inserts on Cutting Forces in Orthogonal Cutting

Maan A. Tawfiq; Basim S. Sahib

Engineering and Technology Journal, 2015, Volume 33, Issue 3, Pages 694-702

In this study, an attempt has been made to investigate and simulate the influence of coated layers, on the cutting force components in orthogonal turning process using AISI 1010 steel.A series of experimental and numerical tests have been done with four types of inserts including uncoated, coated tool with (TiN), (TiN /TiCN) and (TiN /Al2O3/ TiCN) using the special FEA code (DEFORM-2D). The turning tests were conducted at five different cutting speeds (45, 65, 97, 145, and 206 m/min.), while feed rate and depth of cut were kept constant at (0.2 mm/rev.) and (1.2 mm) respectively.
The results show that the minimum force is achieved when using TiN/TiCN insert compared with other inserts in all cutting conditions. The cutting force components (tangential and feed force) are decreasedby (22% and 69% respectively) when the cutting speedincreases from (45 to 206) m/min. The maximum relative difference between simulated and measured values is less than (17%).