scholarly journals Evaluation of hot forging lubricant for aluminum by ring compression test.

1993 ◽  
Vol 43 (12) ◽  
pp. 698-703
Author(s):  
Kiyoshi TAMURA ◽  
Saburo NISHIYAMA ◽  
Yasuo TANIZAWA ◽  
Mitsugu MOTOMURA ◽  
Atsusi HASEGAWA
Keyword(s):  
Compression Test ◽  
Hot Forging ◽  
Ring Compression Test ◽  
Ring Compression

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.

Friction in Hot Forging of Chrome Steel Covered with Oxide Scale Film Generated at Steam Atmosphere

2014 ◽  
Vol 622-623 ◽  
pp. 194-200
Author(s):  
Ryo Matsumoto ◽  
Shohei Harada ◽  
Hiroshi Utsunomiya
Keyword(s):  
Oxide Scale ◽  
Compression Test ◽  
Hot Forging ◽  
Chemical Compositions ◽  
Ring Compression Test ◽  
Chrome Steel ◽  
Air Atmosphere ◽  
Ring Compression ◽  
Plastic Deformation Behavior ◽  
Shear Friction

The hot ring compression test of chrome steel covered with an oxide scale film is carried out to examine the effects of the oxide scale film on the hot forging characteristics. For changing the chemical compositions of the oxide scale, the oxide scale film is generated at air or steam atmosphere. The nominal coefficient of shear friction of the chrome steel covered with the oxide scale film is estimated from the plastic deformation behavior during the ring compression test. The estimated coefficient of shear friction of the chrome steel covered with the oxide scale film is found to be lower than that of the chrome steel without the oxide scale film. Furthermore, the oxide scale generated at steam atmosphere provides lower friction characteristics in comparison with the oxide scale generated at air atmosphere. The mechanism of the reduction of friction with the oxide scale is discussed.

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

Determination of the friction factor of Ti-6Al-4V titanium alloy in hot forging by means of ring-compression test using FEM

2011 ◽  
Vol 44 (12) ◽  
pp. 2074-2080 ◽  
Author(s):  
Yanchun Zhu ◽  
Weidong Zeng ◽  
Xiong Ma ◽  
Qingan Tai ◽  
Zhihua Li ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Friction Factor ◽  
Compression Test ◽  
Hot Forging ◽  
Ring Compression Test ◽  
Ring Compression

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