High-precision and high-strength cold-drawing forming die for special-shaped D-shaped pipe

Abstract

The invention discloses a high-precision and high-strength cold-drawing forming die for a special-shaped D-shaped pipe. The high-precision and high-strength cold-drawing forming die comprises an outerdie body and an inner die body, and the outer die body comprises an outer die main body. The outer die main body is of an axisymmetric structure, the overall shape structure of the outer die main body is a cylinder, and a forming die cavity is machined in the center of the outer die main body. The first circular-arc inlet section is machined on the section inner contour in the forming die cavity,wherein the section inner contour penetrates through the symmetry axis of the forming die cavity and is parallel to the forming die cavity. The first circular-arc inlet section is in transition connection with the first circular-arc transition section, and the other end of the first circular-arc transition section is in transition connection with the first straight section. By adopting the high-precision and high-strength cold-drawing forming die as well as a cold-drawing auxiliary process, the special-shaped D-shaped pipe can be machined and produced, and then steel pipes of various specialshapes or special properties on oil downhole tools and construction machines can be machined. Complex machining can be simplified, the structural weight is greatly reduced, steel is saved, and throughmachining hardening, the strength of finished pipe metal is greatly improved.

Description

technical field [0001] The invention belongs to the field of processing and manufacturing devices for special-shaped steel pipes, and in particular relates to a high-precision, high-strength special-shaped D-shaped pipe cold-drawn forming die, and in particular relates to advanced preparation and processing of metal and non-metallic materials. Background technique [0002] As construction machinery, petroleum downhole tools and other industries put forward higher and more specific requirements for product quality and special shapes, the traditional bent and welded special-shaped pipes cannot meet the current product requirements in terms of performance, dimensional accuracy and productivity. [0003] Especially for oil downhole tools, the use conditions are relatively harsh, and the terrain conditions are relatively complex, so the pipes used in the downhole need to have good bending and torsion resistance, and its shape also needs parts that can adapt to complex shapes. Co...

AI Technical Summary

Problems solved by technology

[0002] As construction machinery, petroleum downhole tools and other industries put forward higher and more specific requirements for product quality and special shapes, the traditional bent and welded special-shaped pipes cannot meet the current product requirements in terms of performance, dimensional accuracy and productivity.

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