An Extrusion Die for Small Diameter Thin Wall Deep Blind Hole Parts

Abstract

The invention discloses a small diameter thin wall deep blind hole part extrusion mold which combines extrusion and stretching working procedures into one mold and is applied to molding of small diameter thin wall blind hole parts with large deformation quantity, extrusion ratio and long diameter ratio. The small diameter thin wall deep blind hole part extrusion mold structurally comprises an upper mold plate, a lower mold plate, a lower mold core, guiding position-limiting components, a mold cavity with a heating function and a punch head, wherein a pull mold angle arranged inside the mold cavity makes materials be capable of flowing out of a deformation area in the reverse extrusion process to reduce the contact area with the mold, so that load of the mold in the reverse extrusion process is reduced, the key problem that the small-diameter punch head has short life in the extrusion process is solved, the mold cavity acts as a pull mold to be used in the ascending process, and the stretching materials are normalized to the standard size. According to the small diameter thin wall deep blind hole part extrusion mold, by means of the manner that a reverse extrusion mold and a stretching mold are combined into one mold, the molding efficiency of small diameter thin wall deep blind holes can be effectively improved, and the material use ratio is high; and meanwhile, produced products have low residual stress, the fabrication cost is low, the mold is convenient to maintain and operate, and the small diameter thin wall deep blind hole part extrusion mold has wide application value.

Description

technical field [0001] The invention belongs to the field of metal plastic processing, and in particular relates to an extrusion molding die for small-diameter thin-walled deep blind hole parts. Background technique [0002] At this stage, metal plastic processing usually adopts two methods of back extrusion and stretching when processing blind hole parts, but for some products with special requirements, such as small diameter deep blind hole parts or even small diameter thin wall deep blind hole parts , the simple reverse extrusion forming process is far from enough in the blind hole depth due to the strength limitation of its small-diameter punch. Similarly, the simple stretch forming process will cause cracks or even fractures during the stretching process of thin-walled parts. Compared with other forming processes: casting is not used because of the lack of products with high tensile strength and obvious stress concentration. The small-diameter thin-walled deep blind hol...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an extrusion molding die for small-diameter thin-walled deep blind-hole parts, which solves the problem of cumbersome processing procedures (multiple deformations) and poor product quality (existence Internal defects, low yield) problems

Images