Tension is to apply tension to the sheet material through the tension die, so that the sheet material produces uneven tensile stress and tensile strain, and then the mating surface of the sheet and the tension die gradually expands until it completely fits the surface of the tension model.

The applicable objects of the pull-shape are mainly double-curvature skins with certain plasticity, large surface area, gentle and smooth curvature changes, and high quality requirements (accurate shape, smooth streamline, stable quality). Because the process equipment and equipment used for drawing is relatively simple, the cost is low and the flexibility is large; however, the material utilization rate and productivity are low.

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