Method for forming thin-wall sheet metal parts like cone-wall oblique flanges through hydrodynamic deep drawing

Abstract

The invention provides a method for forming thin-wall sheet metal parts like cone-wall oblique flanges through hydrodynamic deep drawing, belonging to the technical field of hydraulic forming of sheets. The method comprises the steps that: a cavity of a female die that is also used as a liquid bath is filled with liquid, when sheets are driven by a terrace die to enter the female die, liquid is compressed to form back pressure which enables the sheets to attach to the terrace die and be formed; when in deep drawing, the sheets are arranged on the female die filled with the liquid, after the sheets are tightly compressed by a pressure plate and when the terrace die moves downwards, the female die and the pressure plate rotate around an axial line perpendicular to the down direction of the terrace die while clamping the sheets, further the female die and the pressure plate move in a plane perpendicular to the down direction of the terrace die to ensure uniform deep drawing gaps in the deep drawing process, and flanges with certain inclination angle can be formed when the deep drawing is finished; meanwhile, the female die and the pressure plate can slightly move in a horizontal plane, so as to regulate the gaps between the terrace die and the female die and form uniform deep drawing gaps in the deep drawing process.

Description

Technical field: [0001] The invention belongs to the technical field of sheet metal hydroforming, and in particular relates to a liquid-filled deep drawing forming method for thin-walled sheet metal parts such as tapered wall oblique flanges. The method can be used for manufacturing thin-walled sheet metal parts such as tapered wall oblique flanges. Background technique: [0002] Conical wall oblique flange sheet metal parts are a kind of special shape parts, such as attached image 3 As shown, such parts can be manufactured by spinning or hydroforming. The specific process of manufacturing by spinning is as follows: after the blank is cut, it is first hand-spun to the shallowest point of the flange depth to process a conical part of equal height, and then planed by hand on the mold to make the blank of the part fit together. The inclined flange is formed after the mold; because the spinning process makes the thickness of the cone wall severely thinned and the thickness of t...

AI Technical Summary

Problems solved by technology

Due to the characteristics of the shape of the cone-wall oblique flange parts, when using traditional hydroforming to manufacture such parts, the contact area between the bottom surface of the punch and the sheet metal is small at the initial stage of deep drawing, and the sheet metal near the contact point will be deformed sharply It is easy to cause cracking; although the preloading at the initial stage of deep drawing can increase the contact area between the sheet and the punch, a higher preload will cause the excessive inflating of the suspended high point of the sheet and cause the drawing process to fail, or There are obvious thinning marks on the surface of the final formed part

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