Cold-drawing inner mold for eliminating inner spiral ribbing of steel pipe

A technology of internal spiral and internal mold, applied in the direction of wire drawing dies, etc., can solve problems such as difficult to eliminate, and achieve the effects of reducing extrusion stress, reducing drawing passes, and increasing length

Pending Publication Date: 2018-12-11
江阴市洪腾机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This inner helical rib is difficult to eliminate through the existing cylindrical or conical inner die drawing

Method used

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  • Cold-drawing inner mold for eliminating inner spiral ribbing of steel pipe
  • Cold-drawing inner mold for eliminating inner spiral ribbing of steel pipe
  • Cold-drawing inner mold for eliminating inner spiral ribbing of steel pipe

Examples

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Effect test

Embodiment Construction

[0012] Such as figure 1 , figure 2 and image 3 As shown, a cold-drawn inner mold for eliminating the inner spiral of the steel pipe for drawing a cold-drawn pipe with an aperture of φ125, it includes an inner mold body 1, and the outer surface of the inner mold body 1 is sequentially provided with first cones The wall-reducing section L1, the first cylindrical wall-reducing section L2, the transition section L3, the second conical wall-reducing section L4 and the second cylindrical wall-reducing section L5; the length of the first conical wall-reducing section L1 is 72mm, and the first conical wall-reducing section The cone angle α of the section L1 is 6 degrees; the diameter of the first cylindrical uniform wall section L2 is φ123mm, and the length is 20mm; the diameter of the transition section L3 is φ118.5mm, and the length is 3mm; the length of the second conical wall-reducing section L4 is 15mm, the cone angle β of the second cone wall-reducing section L4 is 12 degree...

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Abstract

The invention relates to a cold-drawing inner mold for eliminating inner spiral ribbing of a steel pipe. The cold-drawing inner mold comprises an inner mold body; a first conical wall reduction section, a first cylindrical uniform-wall section, a transition section, a second conical wall reduction section and a second cylindrical uniform-wall section which are sequentially arranged in front and rear of the outer surface of the inner mold body; the conical angle alpha of the first conical wall reduction section is 2-10 degrees, the conical angle beta of the second conical wall reduction sectionis 8-15 degrees; the conical angle alpha of the first conical wall reduction section is smaller than the conical angle beta of the second conical wall reduction section; a plurality of planes are uniformly distributed on the circumference of the outer circle surface of the first cylindrical uniform-wall section in a milled mode; and the milling depth a of each plane is 0.1-0.5mm. The cold-drawinginner mold has the advantage that the inner spiral ribbing of the steel pipe can be eliminated.

Description

technical field [0001] The invention relates to a cold-drawing inner mold, in particular to a cold-drawing inner mold for eliminating the inner spiral of a steel pipe. Background technique [0002] The technology of cold-drawn precision seamless steel pipe is to pass the hot-rolled seamless steel pipe through a large-scale hydraulic cold drawing machine, and adopt a specific cold drawing process for plastic deformation to produce precision steel pipe. Using a strong drawing force to pull out the steel pipe from the inner and outer molds of the cold drawing machine, and applying extrusion to make the steel pipe billet achieve high dimensional accuracy and surface finish is a non-cutting processing method. Cold-drawn precision seamless steel tubes can be directly honed and rolled for hydraulic cylinder barrels. The characteristics of cold-drawn steel pipes are high utilization rate of metal materials, high production efficiency, and good mechanical properties of steel pipes. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C3/02B21C1/22
CPCB21C3/02B21C1/22
Inventor 奚金法陈万勇汤丹旦
Owner 江阴市洪腾机械有限公司
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