FE analysis of the sensitivity of friction calibration curves to dimensional changes in a ring compression test

2011 ◽  
Vol 17 (2) ◽  
pp. 187-197 ◽  
Author(s):  
Jeong Hoon Noh ◽  
Jeong Min Seo ◽  
Beong Bok Hwang
Keyword(s):  
Compression Test ◽  
Fe Analysis ◽  
Ring Compression Test ◽  
Dimensional Changes ◽  
Calibration Curves ◽  
Ring Compression ◽  
Friction Calibration

Analysis of Ring Compression Test for Determination of Friction Circumstances in Forging Process

2012 ◽  
Vol 249-250 ◽  
pp. 663-666 ◽  
Author(s):  
Mojtaba Dehghan ◽  
Fathallah Qods ◽  
Mahdi Gerdooei ◽  
Javad Doai
Keyword(s):  
Friction And Wear ◽  
Fe Analysis ◽  
Ring Test ◽  
Ring Compression Test ◽  
Friction Behavior ◽  
Forging Process ◽  
Calibration Curves ◽  
Ring Compression ◽  
Friction Calibration

Friction is a major factor in determining the characteristics ofmetals as they are forged.Regularand efficient lubrication is one of the best ways in controlling friction and wear in this process.One of the best ways of testing the lubricant is the ringCompression test. In this research the effect of mixed graphite in water and also the effect of the amount of graphite in the lubricant in the reduction of friction between the sample-die are calculated using the ring test. Friction behavior is changed fromsticking friction to sliding frictionby using the lubricant; but the changes in the amount of graphite in water didnot have a great effect on the reduction of the friction coefficient. Furthermore, after viewing differences in the friction coefficients calculated by the means of FE analysis and the friction calibration curves, it is concluded that the sole calibration curves could not be used for hot working conditions.

scholarly journals Estimation of friction by using improved calibration curves of ring compression test for hot forging of steel

2017 ◽  
Vol 207 ◽  
pp. 2280-2285 ◽  
Author(s):  
Kazuhito Asai ◽  
Kazuhiko Kitamura ◽  
Nobuki Yukawa ◽  
Nobukazu Hayashi
Keyword(s):  
Compression Test ◽  
Hot Forging ◽  
Ring Compression Test ◽  
Calibration Curves ◽  
Ring Compression

FEM Simulation Analysis of Ring Compression Test Using Stationary and Rotating Die under Constant Shear Friction

2020 ◽  
Vol 830 ◽  
pp. 15-28
Author(s):  
Wayne Stalls ◽  
Un Chin Chai ◽  
Tim Pasang ◽  
Gow Yi Tzou
Keyword(s):  
Friction Factor ◽  
Compression Test ◽  
Simulation Analysis ◽  
Metal Flow ◽  
Fem Simulation ◽  
Compressive Force ◽  
Reduction Ratio ◽  
Ring Compression Test ◽  
Ring Compression ◽  
Friction Calibration

The main objective of this research was to investigate the effect of friction on the behaviour of the metal flow and ring geometry, using comparisons from a stationary and rotating bottom die. This was carried out using friction calibration curves, compressive force analysis, stress and strain relationships and the reduction ratio of the ring specimen. The ring compression test (RCT) is considered one of the most reliable ways to obtain the friction factor existing in a plastic deformation process. This technique utilizes the dimensional changes of a test specimen to determine the magnitude of the friction factor. The variation of the calibration curve for the stationary die, with a range of m=0.0 to 0.9, and for the rotating die a range of m=0.1, 0.5 and 0.9. The frictional factor is calculated using FEM analysis, friction calibration and reduction ratio curves were generated from the compressive force using the DEFORM software package. The results indicated that the change in the inner diameter is related to the friction conditions and angular velocities at the die-workpiece interface.

Development of Lubricants Evaluation for Different Friction Laws by Using Rigid-Plastic Finite Element Method

2012 ◽  
Vol 626 ◽  
pp. 584-588
Author(s):  
Heng Keong Kam ◽  
Wen Chiet Cheong ◽  
Chan Chin Wang ◽  
Ying Pio Lim
Keyword(s):  
Finite Element Method ◽  
Coulomb Friction ◽  
Ring Compression Test ◽  
Rigid Plastic ◽  
Friction Law ◽  
Calibration Curves ◽  
Ring Compression ◽  
Shear Friction ◽  
Coulomb Friction Law ◽  
Friction Calibration

A simulator based on rigid-plastic finite element method is developed with two common friction law: Coulomb friction law and constant shear friction law are imposed. This project is to develop a simple method to identify tribological properties of various lubricants by metal forming method. In this project, the influence of different lubricants was studied by using ring compression test. The deformation of the ring compression test was measured to obtain an experimental friction calibration curves under different lubricants. To model the friction effect, theoretical friction calibration curves for Coulomb friction law and shear friction law are generated under various parameter of μ, coefficient of friction (Coulomb friction law) and m, shear factor (constant shear friction law). The experimental and theoretical friction calibration curves were compared and the result shows corresponding. The friction of the lubricants was further verified by using a common method: pulling a block on flat surface with load sensor yields the friction force, F in the basic equation F=μN where N is the normal force. The results match the calibration curves too.

Evaluation of Friction Properties of Magnesium Alloy during Hot Forging by Ring Compression Test

2017 ◽  
Vol 889 ◽  
pp. 119-126
Author(s):  
Sueji Hirawatari ◽  
Hisaki Watari ◽  
Shinichi Nishida ◽  
Yuki Sato ◽  
Mayumi Suzuki
Keyword(s):  
Magnesium Alloys ◽  
Compression Test ◽  
Hot Forging ◽  
Hot Forming ◽  
Compression Tests ◽  
Ring Compression Test ◽  
Stress Strain ◽  
Friction Coefficients ◽  
Ring Compression ◽  
Velocity Motion

This paper deals with friction properties and deformation resistance during hot forming of Mg-Al-Ca-Mn series magnesium alloys. Friction coefficients between dies and magnesium alloys were obtained by ring compression tests that used graphite, PTFE, and an oil lubricant in a hot-forging process. Hot forging was performed under various conditions to clarify the effects of types of lubricants and slide motion of the press machines on friction properties. Two types of slide motion, a constant velocity motion and a pulse motion were selected in the ring-compression test. It was found that graphite with an oil lubricant effectively eliminated die sticking in hot forming of magnesium alloys. The isothermal deformation resistances were derived using friction coefficients obtained by ring-compression tests as well as finite-element simulations. The predicted stress strain curves with temperature were examined with the stress-strain relationship obtained in experiments using a servo press and demonstrated the effectiveness of the proposed method.

scholarly journals Studies on friction behaviour of aluminium AA4032 alloy during forging using ring compression test

2021 ◽  
Vol 13 (3) ◽  
pp. 23-36
Author(s):  
Desalegn Wogaso ◽  
Mohammed Hamda
Keyword(s):  
Friction Factor ◽  
Metal Surface ◽  
Palm Oil ◽  
Compression Test ◽  
Metal Flow ◽  
Work Piece ◽  
Ring Compression Test ◽  
Ring Compression ◽  
Friction Behaviour ◽  
Selection Of

In metal forming, friction has a negative effect on the deformation load & energy requirements, homogeneity of metal flow, quality of formed surfaces, etc.; however, its effect can be reduced through the use of proper lubricants. Mostly, in industrial applications, selection of proper lubricant for specific material is challenging and quantification of magnitude of friction at diework piece interface is essential. Hence, for metallic alloys, a realistic friction factor is needed to be known and used at the diework piece interface for better control of deformation process. Thus, this research, generally, aims at experimental investigation of the friction behavior of aluminum AA4032 alloy and selection of suitable lubricant for its effective processing using ring compression test and finite element (FE) simulations. Meanwhile, the effect of metal surface conditions and different lubricants namely palm oil, grease, emulsion oil and dry conditions on the friction behaviour has been evaluated. A commercial FEM software, DEFORM 3D, is used to analyze the flow of metal, determine the geometry changes of the specimen and generate friction calibration curves. The results revealed that the nature of metal surface and lubricating conditions have significantly affected the metal flow pattern, deformation load requirement, induced effective stress and strain, and geometry of the metal. The friction factor at die-work piece is determined for different lubricating conditions. Among lubricants employed, palm oil is found to be suitable and effective for industrial processing of aluminium AA4032 alloy, specifically for forging. The FE simulation results are in a good agreement with the experimental one.

scholarly journals Evaluation of Cold Forging Lubricants for Steel by Ring Compression Test with Rotating Die

2018 ◽  
Vol 59 (687) ◽  
pp. 53-58
Author(s):  
Masatoshi SAWAMURA ◽  
Yasuhiro YOGO ◽  
Michiaki KAMIYAMA ◽  
Noritoshi IWATA
Keyword(s):  
Compression Test ◽  
Cold Forging ◽  
Ring Compression Test ◽  
Ring Compression

Effect of lubrication on hardness in the ring compression test

2015 ◽  
Vol 230 (12) ◽  
pp. 1939-1950 ◽  
Author(s):  
CH HariKrishna ◽  
MJ Davidson ◽  
CH Nagaraju ◽  
B Anil Kumar
Keyword(s):  
Boric Acid ◽  
Strain Hardening ◽  
Compression Test ◽  
Hardness Distribution ◽  
Simulation Studies ◽  
Ring Compression Test ◽  
Ring Specimen ◽  
Ring Compression ◽  
Different Types ◽  
Metallic Ring

This paper focuses on the hardness distribution in the AA2014-T6 ring specimens upset under rigid dies. Three different types of lubricants namely soap, boric acid and vaseline were employed as lubricants and the friction factor corresponding to the lubricant employed was evaluated using standard ‘Ring compression test’. The strain distributions obtained from the simulation studies were used to predict the hardness inside the ring specimen. The hardness measured experimentally was validated with the predicted hardness and it was found that the errors in the predicted results were less than 10%. The hardness variations inside the upset metallic ring specimens were compared with the deformed solid cylinders to understand the behavior of differential strain hardening. It can be reported from the experimental and predicted results that the hardness is not uniform inside the deformed ring specimen and it varies at the bulge head; on the surface and along the neutral plane.

Sign in / Sign up

Export Citation Format

Share Document