A Radial-Reverse Combined Extrusion Die for Thin-walled Cylindrical Parts with Outer Boss

Abstract

The invention discloses a radial-reverse combination extrusion forming mold of a thin-wall cylindrical piece with an outer boss. The mold comprises an upper mold assembly, a lower mold assembly, a male mold, a female mold, a mandrel, a core support, an extrusion ring, an ejection block and a movable block, wherein the male mold is mounted on the upper mold assembly, the core support is mounted atthe bottom of the mandrel, the mandrel drives the core support to slide and stretch out and draw back of the male mold, and the extrusion ring sleeves the part stretching out of the core support; thefemale mold is mounted on the lower mold assembly, a cavity and a movable block groove are arranged in the female mold, the core support and the cavity are located on the same central shaft, after themovable block groove allows the movable block to be placed and is filled with the movable block, the shape of the cavity is a full cylinder shape, the ejection block is arranged in the cavity, the height of the ejection block is smaller than the height of the cavity, the upper part of the movable block protrudes out of the ejection block, the side surface forms an inwards-concaved boss cavity, and the outer diameter of the extrusion ring is the same as the diameter of the female mold cavity. The radial-reverse combination extrusion forming mold of the thin-wall cylindrical piece with the outer boss can directly form the thin-wall cylindrical piece with any position, size and number of bosses at one step, and the mechanical performance of the thin-wall cylindrical piece is greatly improved.

Description

technical field [0001] The invention relates to the technical field of plastic processing and forming of metal materials, in particular to a radial-reverse combined extrusion forming die for a thin-walled cylindrical part with an outer boss. Background technique [0002] The main structural feature of thin-walled cylindrical parts with outer bosses is that there are outer raised structures formed on the side walls of hollow cylindrical parts with circular and rectangular cross-sectional shapes. The outer raised structures are called outer bosses, which are often used as bearings. key parts of the force. At present, this type of component is traditionally processed by casting and welding, which mainly has the following shortcomings: 1. The casting is prone to defects such as shrinkage and porosity, and the strength is low; 2. The strength of the welding part of the welded structure is low and easy to be damaged, and it is easy to be damaged in a special environment. Corrosio...

AI Technical Summary

Problems solved by technology

At present, this type of component is traditionally processed by casting and welding, which mainly has the following shortcomings: 1. The casting is prone to defects such as shrinkage and porosity, and the strength is low; 2. The strength of the welding part of the welded structure is low and easy to be damaged, and it is easy to be damaged in a special environment. Corrosion; 3. The traditional extrusion method cannot directly form the outer boss, and the formed ring rib can be cut into the outer boss, but forming the ring rib needs multiple times of material gathering, the process is complicated, the dimensional accuracy is low, and the subsequent cutting process will destroy Metal flow lines in key parts

[0006] These mold structures are suitable for the forming of flanges or bosses in the "reverse-radial" process, but there are restrictions on the position and structural size of the flanges or bosses due to the wall thickness of thin-walled cylinders

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