Drawing die for rectangular flat steel tube

Abstract

The invention discloses a drawing die for a rectangular flat steel tube, which does not need to be corrected after heat treatment and can ensure the precision and surface flatness of the rectangular flat steel tube. The drawing die comprises a die body, wherein a drawhole of the drawing die comprises an inlet section, a transition section and a sizing section, and the sizing section comprises a pair of straight short surfaces, a pair of arc long surfaces and four corner arc surfaces which connect the straight short surfaces with the arc long surfaces; the transition section comprises four transition inclined planes which are joined with the straight short surfaces and the arc long surfaces and four transition corner curved surfaces which connect the two adjacent transition inclined planes; and the inlet section comprises four leading-in curved surfaces which are respectively joined with the corresponding transition inclined planes and protrude outwards and inlet corner curved surfaces which connect the two adjacent leading-in curved surfaces, the four leading-in curved surfaces are all quadric surfaces, and the opposite leading-in curved surfaces are symmetrically distributed. The drawing die is used for drawing a circular steel tube to form the rectangular steel tube.

Description

technical field [0001] The invention relates to a drawing die in the technical field of metal plastic processing, in particular to a drawing die for drawing a round steel pipe into a rectangular flat steel pipe. Background technique [0002] The drawing die is an important tooling part in the production of cold-drawn steel pipes, and has been widely used in the production process of steel pipe diameter reduction and / or deformation. The steel pipe is cold drawn and formed by using a drawing die, which has the characteristics of high material utilization rate, low energy consumption, excellent product performance, high production efficiency and low cost. In the drawing die, according to the different shapes of the pipes that are drawn and formed, it is divided into conventional drawing dies and special-shaped drawing dies, and special-shaped drawing dies (also called special-shaped drawing dies) are used for cold drawing special-shaped pipes. ; According to whether it has a l...

AI Technical Summary

Problems solved by technology

When correcting, since the material belongs to micro-deformation and high-carbon alloy mold steel, the internal and external hardness, strength and wear resistance of the mold material are basically the same, so it cannot be corrected by machining, and can only be corrected manually, which makes the correction work intensive and Difficult and inefficient

[0007] In addition, in the production process of drawing flat steel pipes using drawing dies, it was also found that when drawing steel pipes with empty drawing dies, since there is no lining core (inner mold) support in the drawing dies, the flat steel pipes The depression is more serious

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