Device for preventing suspension area from breaking while taper piece filling liquid and drawing deep forming and forming method

Abstract

The present invention relates to a conical component forming device capable of preventing floating zone from being broken when the conical component is formed by adopting liquid-charging and drawing process and its forming method. Said conical component forming device is characterized by that its rigid edge-pressing ring is set over a concave die, in said rigid edge-pressing ring interior a recessed groove is cut, a flexible supporting ring is placed in the recessed groove interior, said concave die is placed on the fluid medium cavity, and its liquid-injecting hole is connected with its hydraulic system. Its forming method includes the following steps; (1), making the liquid-injecting hole on the cavity body be communicated with the hydraulic system; (2), placing a plate blank on the concave die; (3), making the rigid edge-pressing ring be moved downwards and apply edge-pressing force; and (4), making convex die be downwards moved until the plate blank is drawn into the concave die interior with the convex die so as to obtain a formed conical component.

Description

technical field [0001] The invention relates to a device and a forming method for rupturing a suspended area of ​​a conical part through liquid-filled deep drawing. Background technique [0002] In the sheet metal forming process, for the sheet metal parts whose shape and size are consistent with the punch and the height-to-diameter ratio is greater than 1, it is difficult to form in one time by ordinary drawing. At present, fluid is usually used as a force transmission medium to assist forming processing. The principle is to make the sheet close to the punch under the action of fluid back pressure, and the back pressure enhances the friction effect between the blank and the punch, forming a beneficial friction force, which can offset the punch. The partial tensile stress of the blank at the rounded corner improves the bearing capacity of the deformed blank, thereby avoiding the rupture of the material at the rounded corner of the punch and realizing the forming of the sheet...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of existing forming technology for conical parts with large height-to-diameter ratio and large cone angle, the liquid-filled deep drawing using a rigid blank holder will form a large suspended area during the forming process. Blank-holding force, the deep-drawing punch is drawn downward at a certain speed, and the liquid-filled deep-drawing is performed under the action of the back pressure in the liquid chamber (concave die), and is affected by the bulging and rupture factors in the suspended area. The size of the back pressure is limited, and it is still impossible to form parts with deep or large cone angles in one process. Multi-pass forming increases costs, prolongs the processing cycle, and the accumulation of multi-pass forming affects the uniformity of the part wall thickness. Provided is a device and forming method for preventing the breakage of the suspended area during the liquid-filled deep drawing of the conical part. The specific technical solution to solve the above problems is as follows:

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