Study of the deformation velocity field and drawing force during the dieless drawing of tube

Dieless drawing is a newly developed flexible metal forming technique without dies, which is performed only according to the feature that the yield strength of the metal varies with the deformation temperature. The precision and shape of the product are controlled by the drawing speed and the speed...

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Bibliographic Details
Published in:Journal of materials processing technology 1999-09, Vol.94 (2), p.73-77
Main Authors: Wang, Z.T., Luan, G.F., Bai, G.R.
Format: Article
Language:English
Subjects:
Dieless drawing
Drawing force
Velocity field
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Summary:Dieless drawing is a newly developed flexible metal forming technique without dies, which is performed only according to the feature that the yield strength of the metal varies with the deformation temperature. The precision and shape of the product are controlled by the drawing speed and the speed of movement of the heating–cooling apparatus. Dieless drawing is a technology that has many advantages, such as high precision, high efficiency, low consumption of energy, no pollution of the environment and flexibility. It can be used to form some materials, i.e. those that have high strength and high frictional resistance and low plasticity at room temperature, which cannot be formed using conventional forming technology. Variable section tubular parts, such as conical and laddertron and wavelike, which are difficult to be formed using conventional metal forming technology, can be formed easily using this technology. On the basis of the analysis of the deformation mechanism and velocity field of tube dieless drawing, the drawing force and velocity field are studied theoretically and relevant equations have been determined by means of the power equilibrium method. The drawing force has a relation to the width of the deformation field, the sectional reduction ratio, the deformation temperature, the drawing speed, the speed of movement of the heating–cooling apparatus and the carbon content. With the increasing of the sectional reduction ratio, the drawing speed, and the speed of movement of the heating–cooling apparatus, the values of the drawing force also increase. With the increasing of the deformation temperature and the deformation width, the values of the drawing force decrease.
ISSN:0924-0136
DOI:10.1016/S0924-0136(98)00452-X