Hot pressing forming mould and hot pressing forming method of super long branch pipe three-way pipe fitting

Abstract

The invention relates to a hot pressing forming mould of a super long branch pipe three-way pipe fitting, comprising a first upper die, a second upper die, a first lower die, a second lower die, a third lower die, a fourth lower die and a draw bar. A primary forming mould consists of the first upper die and the first lower die; a secondary forming mould consists of the first upper die and the second lower die; a third forming mould consists of the first upper die and the third lower die; and a final forming mould consists of the second upper die, the fourth lower die and the draw bar. The invention also relates to a hot pressing forming method which adopts the mould to manufacture the super long branch pipe three-way pipe fitting. Two upper dies and four lower dies are adopted by the invention to be drawn and extruded step by step into a super long branch pipe; in each hot pressing forming process, the tensile deformation of the materials is ensured to be within the tensile rate limit by controlling the root R and the outer diameter D of the branch pipe to be decreased successively, thereby solving the forming problem of super long branch pipe tee (M>1.5C).

Description

technical field [0001] The invention relates to the field of pipe fitting processing equipment, in particular to a mold and a forming method for hot-press forming tee pipe fittings. Background technique [0002] Tee fittings are widely used in pipelines for pipeline connection. Hot press forming method is commonly used in production to manufacture seamless tee fittings with large diameter and thick pipe wall. The required equipment tonnage requirements can be reduced. Such as figure 1 As shown, the length M of the seamless tee branch pipe 1 in the Chinese national standard is equal to the length C of the main pipe 2. For the hot-press forming of the seamless tee of this national standard, the specific process is as follows figure 2 , image 3 As shown: First, flatten the tube blank 4 larger than the diameter of the tee to the size of the tee diameter, and open a hole 6 at the position of the stretched branch pipe; heat the tube blank 4, and put it into the upper mold of...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned shortcomings that the existing production process and molds cannot manufacture super-long branch tee pipe fittings, the applicant provides a hot-press forming mold and a hot-press forming method for super-long branch pipe tee pipe fittings, so that it can be manufactured on existing equipment Super long branch pipe tee fittings

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