Forging forming die and method for cylindrical part plate with small fillet characteristic

Abstract

The invention discloses a forging forming die for a cylindrical part plate with a small fillet characteristic. The forging forming die comprises an inner side male die, an outer side male die, a female die, a female die base plate and a floating mandrel. The invention further provides a forging forming method for the cylindrical part plate with the small fillet characteristic. A pipe blank with the outer diameter equal to that of a cylindrical target part is put on the female die base plate, and the inner side male die and the outer side male die are driven to synchronously move downwards at aconstant speed to upset and extrude the pipe blank to form an inner flange upsetting piece. After moving to the lower limit, the outer side male die is kept still with constant load, the inner side male die continues to descend to shear the inner flange upsetting part, a metal material is forced to continuously flow to a closed cavity defined by the inner side male die, the outer side male die, the female die, the female die base plate and the floating mandrel, and finally the cylindrical part with the small fillet characteristic is upset and extruded. The cylindrical part with the small fillet characteristic is formed in one procedure, the buckling instability problem is solved, the defects of folding, inward sinking and the like are overcome, and the fillet filling plumpness and the mechanical property of the target part are improved.

Description

Technical field[0001]The invention relates to the technical field of metal plastic forming, in particular to a cylindrical piece plate forging forming die and method with small rounded corners.Background technique[0002]When forming a cylindrical part or a box-shaped part by sheet metal stamping, the material in the corner area of ​​the punch is subjected to bidirectional tensile stress, which makes the wall thickness thinner. The smaller the punch corner, the more serious the wall thickness reduction, which will inevitably affect the service of the parts. The stability and longevity. Important structural parts in the fields of electronics and aerospace require the fillet radius to be smaller than the thickness of the original slab or even smaller in order to improve its bearing capacity and bearing space, which brings new challenges to the field of metal plastic forming.[0003]At present, scholars generally use the double-step process to form cylindrical or box-shaped parts with smal...

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Problems solved by technology

[0003] At present, scholars generally use a double-step process to form cylindrical or box-shaped parts with small rounded corners, that is, use a punch with a large rounded corner radius to draw out the shape of the part or use a flanging process to make a billet, and then upsetting Thick sidewalls are characterized by small rounded corners, but the experimental results show that the thickening of the bottom rounded corners is usually limited, and the filling rate and mechanical properties of the rounded corners are difficult to meet the design and service requirements, and are prone to instability, folding and concave defects. In addition There are also problems such as complex process flow and large forming load

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