Electric field auxiliary deep drawing device for stepped part

Abstract

The invention discloses an electric field auxiliary deep drawing device for a stepped part and belongs to sheet forming dies under the action of an electric field. The electric field auxiliary deep drawing device comprises a male die, a blank holder and a female die, the male die is fixed on an upper die base and is subjected to insulation treatment with the upper die base, the blank holder is fixed on the upper die base and is arranged on the outer side of the male die, and the female die is arranged on the upper part of the lower die base and is provided with an inner hole; a through hole isformed in the middle of the male die, an insulating tube is arranged in the through hole, a power-on tube is arranged in the insulating tube and contacts a head electrode at the lower end of the maledie, the head electrode is placed in a U-shaped insulating sleeve to realize insulation with the male die, an ejection device is arranged in the female die, an insulating cylinder is arranged betweenthe ejection device and the female die, a blank holder electrode is arranged on the blank holder, and an insulating ring is arranged between the blank holder electrode and the blank holder. The electric field auxiliary deep drawing device for the stepped part has strong insulation and simple structure, the problems of difficult drawing, fracture, residual stress and the like in the drawing process of the bottom of the stepped part can be solved, and the quality of the stepped part is improved.

Description

technical field [0001] The invention relates to a drawing die under the action of an electric field, in particular to an electric field-assisted drawing device for a stepped part, which is used in the technical field of sheet metal forming dies under the action of an electric field. Background technique [0002] Deep drawing refers to a mechanical processing process that uses a die to punch a flat blank of a certain shape obtained after punching into various open hollow parts or to reduce the diameter and increase the height of the open hollow blank. The deep drawing process can be used to manufacture cylindrical, stepped, conical, spherical, box-shaped and other irregularly shaped thin-walled parts. It cooperates with other stamping forming processes such as flanging, bulging, flaring, and shrinking, and can also manufacture parts with more complex shapes. Therefore, the stretching process occupies a very important position in the production process of automobiles, aircraf...

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Problems solved by technology

[0003] The traditional rigid punch-and-concave die drawing process requires multiple drawing for parts with a large drawing ratio, and the quality of the parts will not meet the standard. There are electric field-assisted drawing tools suitable for metal plates, such as Chinese patent CN201910902646.1- An electric field-assisted deep-drawing device for difficult-to-deform metal sheets, although it can improve the quality of parts to a certain extent, but it uses rigid particles to assist forming, so the backing plate under the particles is movable, and there is a problem that it cannot be formed for stepped parts , and compared to the blank holder and the electrode on the die, the relative sliding amount of the sheet is relatively large, and electrode failure is likely to occur; although in the field of powder molding, there are related ladder-shaped molds, such as China CN201480077414.2 ladder-shaped mold, its It includes an inner ring and an outer ring. A concave portion for molding with a stepped portion is formed on the inner side of the inner ring. A flange portion that is joined to a mold plate is formed on the outer periphery of the outer ring. The press-fit ratio is set to a value falling within the range of 0.12% to 0.25% so that an appropriate compressive stress can be applied to the corner portion of the stepped portion of the concave portion for molding, preventing possible concentration at the corner due to compression molding. Cracks appear in the corner part due to the bending stress on the part. However, it is not suitable for the deep drawing of the metal plate. For the metal stepped deep drawing, it is easy to break, the part cannot be automatically ejected after forming, and the ejection mechanism is not clear, so it cannot be produced quickly. The problem is even more unsolvable

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