A complete set of dies suitable for labor-saving forming of large-scale thin-walled conical shells

Abstract

The invention discloses a complete set of dies suitable for labor-saving forming of large-sized thin-walled conical shells, including an upper template assembly, two punches that can be replaced on the upper template assembly, a lower template assembly, and a lower template assembly that can be replaced on the lower template assembly. The two dies and ejector pins on the top, the two punches include a cylindrical punch with a sizing and a tapered punch, and the two dies include a "U"-shaped punch that is used in a set with a cylindrical punch with a sizing The die and the conical die used in sets with the conical punch, the upper diameter of the conical inner cavity is larger than the upper diameter of the cylindrical punch with sizing, and the lower diameter of the conical inner cavity is smaller than the diameter of the sizing The lower diameter of the cylindrical punch, the "U"-shaped die is provided with a "U"-shaped inner cavity, and there is a pre-formed gap between the "U"-shaped inner cavity and the cylindrical punch with fixed diameter, the cone The concave die is provided with a tapered inner cavity, and there is a final forming gap between the tapered inner cavity and the tapered punch. This case can effectively reduce the forming load, reduce friction, and make the forming of the conical shell more labor-saving and convenient.

Description

technical field [0001] The invention relates to the field of metal plastic processing technology and forming technology, in particular to a complete set of molds suitable for labor-saving forming of large-sized thin-walled conical shells. Background technique [0002] In the traditional plastic forming process, the forming methods for thin-walled conical parts are mainly deep drawing forming, extrusion forming and spinning forming. Deep drawing is generally used for thin-walled parts. This method is easy to operate and has a high material utilization rate. The disadvantage is that the strength and plasticity of the material are high, and it is easy to cause instability and difficult to control the wall thickness of the part; Extrusion process, the metal is in a state of strong three-dimensional compressive stress during extrusion, which can give full play to its plasticity and obtain a large amount of deformation. The disadvantage is that it requires high equipment load and ...

AI Technical Summary

Problems solved by technology

During the forming process, because the billet is always in contact with the die, a large friction force is generated during the extrusion process. This harsh friction condition will hinder the flow of metal, significantly increase the forming load, and increase energy consumption and cost.

[0005] (2) The mold is easy to wear and damage

During the forming process, the billet and the mold generate great friction and generate a lot of heat, which seriously wears the mold, and because the punch itself has a relatively large height and diameter, it is easy to break during the extrusion process

[0006] (3) Poor dimensional accuracy of parts

For the forming of conical parts, the dimensional accuracy of the parts formed at one time is poor, and it is difficult to realize the forming of precision instruments or parts

[0007] (4) The mold is difficult to demould

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