Female die, die and device for plate blank differential temperature drawing molding and drawing method

Abstract

The invention relates to the technical field of metal machining, and discloses a female die, die and device for plate blank differential temperature drawing molding and a drawing method. The female die is provided with an air inlet passage used for leading cold air into a groove of the female die, and an exhaust passage used for exhausting the cold air out of the groove; and the die comprises a male die, an edge pressing device and the female die which are sequentially arranged in the vertical direction. The device comprises a pressing machine and the die. The drawing method includes the steps that firstly, a plate blank is tightly pressed between the edge pressing device and the female die; and secondly, the plate blank is drawn in the groove of the female die. By means of the technical scheme, the ultimate deformation degree of the plate blank can be improved, and the drawing performance of the plate blank is further improved.

Description

technical field [0001] The present invention relates to the field of metal processing, in particular to a die for slab differential temperature deep drawing, and further, the present invention also relates to a slab differential temperature deep drawing die, a slab differential temperature deep drawing device and A slab differential temperature deep drawing forming method. Background technique [0002] For plate parts characterized by thin walls and large surface areas, in order to process them into predetermined shape parts with thin walls and good mechanical properties, deep drawing is a feasible method. Taking the drawing of a flat slab into a large-sized thin-walled hemisphere as an example, at the beginning, the flat slab has a flat deformation area located under the blank holder, a free surface area located in the gap between the male and female dies, and a contact with the top of the punch. The plastic deformation zone; as the punch goes down, the free surface area o...

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Problems solved by technology

[0003] The quality of deep-drawn parts mainly depends on the key elements such as the material formability, forming process and forming die of the deep-drawn parts. For example, for low-carbon steel slabs, due to their low strength and hardness, they can be deep-drawn at room temperature Forming, but limited by the formability of the material of the slab itself, as the depth of drawing increases, the deformation ability of the slab will decrease, so the maximum depth of drawing is limited; and for the slab of duralumin alloy, Due to high strength and poor plasticity at room temperature, deep drawing at room temperature is very difficult

[0004] In order to reduce the deformation resistance of the higher-strength slab so that the higher-strength slab can be formed smoothly under the action of a smaller drawing force, an isothermal drawing process with a higher temperature can be considered. However, due to the higher temperature High isothermal drawing process, the lower the yield ratio and uniform deformation capacity of the slab, it is very easy to cause local flow of metal in the deformed area, resulting in drawing cracks, and the overall improvement of the slab drawing temperature cannot further improve the slab. Warm deformation ability of billet

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