Performance evaluation of EN24 for planetary gear transmission of CNC bending machine
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(2020) 42:298
TECHNICAL PAPER
Performance evaluation of EN24 for planetary gear transmission of CNC bending machine N. H. Dhanvij1 · S. H. Gawande2 · P. S. Gajjal1 Received: 13 July 2019 / Accepted: 5 May 2020 © The Brazilian Society of Mechanical Sciences and Engineering 2020
Abstract The aim of this research paper is to simulate the process of gear meshing in the planetary gear system (PGT) of CNC bending machine to evaluate the friction coefficient, friction force, and wear rate of EN24 material. EN series of steel is typically used for gear manufacturing. The PGT is capable of transmitting huge torque and provides high performance along with huge reduction ratio. It is used on a grand scale in many applications. Effective meshing is observed at the sun and planet gear interface only. Tests are performed on a cylinder-on-disk machine with varying loads from 60 to 110 N for time duration of 5 min at 1250 rpm. The outcomes elucidate that the friction coefficient fluctuates with time and normal load. From experimental inspection, it is observed that the friction coefficient increases with rubbing time and after that remains constant for a rest period. From experimental investigation, it is observed that the friction coefficient and wear increase with an increase in normal load. It is observed that the presence of carbon content leads to fluctuation in wear rate. Wear measurement test was carried out for EN24 materials by rubbing different cylinders on EN-31 disk. Keywords PGT (planetary gear transmission) · CNC bending machine · Gear meshing · Cylinder-on-disk machine · Friction coefficient · Wear rate List of symbols b Half width of contact (mm) P Contact pressure (N/mm2) F Applied force (N) Feq Equivalent applied force (N) L Length of contact region (mm) v Poisson’s ratio E Young’s modulus (MPa) z Vertical compressed length at point of contact (mm) 𝜎 Principal compressive stress (N/mm2) τ Principle shear stress (N/mm2) R Radius of gear at the point of contact (mm) 𝜏li Shear stress of lubricant (N/mm2) µ Dynamic viscosity (N s/mm2) Technical Editor: Zilda de Castro Silveira, Ph.D. * S. H. Gawande [email protected] 1
Department of Mechanical Engineering, AISSMS College of Engineering, Pune, S. P. Pune University, Pune, India
Industrial Tribology Laboratory, Department of Mechanical Engineering, M. E. S. College of Engineering, Pune, S. P. Pune University, Pune, India
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n Rotation speed of gear or disk (rpm) du Angular velocity (mm/s) h Lubricant film thickness (mm) f Friction coefficient W Friction force (N) u Kinematic viscosity (mm2/s) 𝜌 Density of oil (kg/mm3) ɸ Pressure angle (°) t Time (s)
1 Introduction The main purpose of this research work is to study the tribological behavior of gear steels used in planetary gear transmission system of CNC pipe bending machine. Research in tribology is important as it helps in increasing the plant efficiency, cost savings and also improved performance. EN24 is the key material within the industries for producing gears. There are di
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