Assortment of Hydroforming Fluid for Extreme Pressure and Anti Wear Properties

Volume 12: Advanced Materials: Design, Processing, Characterization, and Applications ◽

10.1115/imece2019-10163 ◽

2019 ◽

Author(s):

S. P. Rudraksha ◽

S. H. Gawande

Keyword(s):

Tube Hydroforming ◽

Vital Role ◽

Test Method ◽

Lubricating Oil ◽

Experimental Investigations ◽

Extreme Pressure ◽

Wear Properties ◽

Premature Failure ◽

Hydroforming Process

Abstract Lubricants play vital role in tube hydroforming (THF) process to reduce friction between tool and die wall interface which helps to enhance the quality of finished product. The process parameters and quality of components is influence by the friction between the tube and inner surface of the die. Excellent lubricant reduces the problem of wrinkling, buckling and premature failure of the component. Extreme pressure, Anti-wear, and frictional properties of fluid influence the performance of tube hydroforming process. In this paper EP (extreme pressure), anti-wear and friction properties of hydroforming lubricating oils as Enklo68, Enklo46, Enklo32 and Enklo100 are investigated. Test method as per ASTM standards is used for the measurement of EP and wear preventive properties of hydroforming fluids by using Ball Tester TR – 30L under atmospheric pressure of lubricating oil at 392 N load and 75°C temperature with constant speed of 1770 rpm. From experimental investigations it is observed that as Enklo68 is more suitable hydroforming fluid as compared to Enklo46, Enklo32 and Enklo100 as its observed coefficient of friction (i.e. 0.10581) is very less.

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Experimental Researches upon Changes of a Pipe's Roughness after Hydroformation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.371.111 ◽

2013 ◽

Vol 371 ◽

pp. 111-115

Author(s):

Bogdan Constantin Vaceanu ◽

Gheorghe Nagit ◽

Vasile Huian

Keyword(s):

Surface Roughness ◽

Tube Hydroforming ◽

Work Piece ◽

Copper Pipe ◽

Work Area ◽

The Coefficient Of Friction ◽

Hydroforming Process ◽

Aluminum Pipe ◽

Experimental Researches

Surface roughness was studied in the tube hydroforming process, considering the quality of the material and the coefficient of friction between the work piece and die. Other researchers have studied the surface roughness to the front of an aluminum pipe [. The aim of this work was to analyze changes in a copper pipe roughness occurred after hydroforming process with fluid. Effects of changing roughness were studied, following the deformation of the material in the work area and roughness changes occurring in the material flow. After achieving hydroforming process, the surface roughness was measured by electron microscopy SEM in different areas of the hydro formed tube. After hydroforming process, an increase of surface roughness in connection areas of the mold to the curvature and the transverse direction of the pipe.

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A comprehensive damage criterion in tube hydroforming

Proceedings of the Institution of Mechanical Engineers Part B Journal of Engineering Manufacture ◽

10.1177/0954405420962968 ◽

2020 ◽

pp. 095440542096296

Author(s):

Reza Pourhamid ◽

Ali Shirazi

Keyword(s):

Damage Model ◽

Tube Hydroforming ◽

Material Model ◽

Vital Role ◽

Numerical Results ◽

Loading Path ◽

Ring Compression Test ◽

Damage Criterion ◽

Ring Compression ◽

Hydroforming Process

In the present study, the Johnson-Cook damage model is proposed as a comprehensive damage criterion to predict all types of probable failures in tube hydroforming process. Also, the Johnson-Cook material model is used to predict the profile of hydroformed tubes and their dimensions. The validity of numerical results was verified using experimental results obtained in this study. Moreover, because of the importance of friction force in this process, existing between the tube and die, the friction coefficient is determined using the ring compression test, separately. The comparison of experimental and numerical results shows that Johnson-Cook damage model can predict all of the possible failures in tube hydroforming process correctly, both in terms of location and loading conditions. And this model does not predict any failure if, the tube is hydroformed perfectly. Additionally, it was cleared that the Johnson-Cook material model is a proper model to predict the profile of hydroformed tubes with remarkable accuracy. Also, it was found that the loading path and creation of a proper wrinkling have a determinative and vital role in the prosperity of the process.

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