公开(公告)号：US11850645B2

公开(公告)日：2023-12-26

申请号：US17509043

申请日：2021-10-24

Applicant: Taiyuan University of Science and Technology

Inventor： Zhibing Chu ,  Chun Xue ,  Duo Zhang ,  Dong Wei ,  Qianhua Yang ,  Cuirong Liu ,  Yugui Li

IPC: B21C37/08 ,  B21C3/06 ,  B21C1/22 ,  B21B25/00

CPC classification number: B21C37/08 ,  B21B25/00 ,  B21C1/22 ,  B21C3/06

Abstract: A method for preparing a multilayer metal composite pipe includes steps of: internally and externally grinding blank pipes; cleaning oil stains; assembling a multilayer metal pipe; drawing to reduce a diameter; performing high-speed friction welding at the pipe ends; performing heat treatment; performing four-roller cross-rolling; straightening; performing two-roller cold-rolling; performing cold-drawing to reduce the diameter; performing cold-expansion to reduce the diameter; performing precise cold-rolling; degreasing; brightening; performing surface grinding; cleaning dust; detecting multilayer metal interface bonding; detecting flaws; testing metal structure performance; and sizing and packaging. By cycling the cold-drawing, the cold-expansion, and the precision cold-rolling, key indicators such as product dimensional accuracy, surface quality, material properties, and crystal grain size can be collaboratively controlled, so as to achieve higher accuracy, better performance, and more outstanding extreme specifications. The present invention solves the problem of inconsistent extension due to differences in metal properties.

公开(公告)号：US12157154B2

公开(公告)日：2024-12-03

申请号：US17509040

申请日：2021-10-24

Applicant: TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Zhibing Chu ,  Qianhua Yang ,  Dong Wei ,  Duo Zhang ,  Chun Xue ,  Xiaodong Zhao ,  Yugui Li

IPC: B21B19/04

Abstract: A method for preparing a high-performance difficult-to-deform metal precision seamless pipe includes steps of performing a heat treatment; drilling; externally grinding; internally grinding; straightening; performing four-roller warm-rolling; performing warm-drawing to reduce a diameter; performing warm-expansion to reduce a wall thickness and increase the diameter; performing precise cold-rolling; degreasing; brightening; performing surface grinding; cleaning dust; detecting flaws; testing metal structure performance; and sizing and packaging. By cycling the warm-drawing, the warm-expansion, and the precision cold-rolling, key indicators such as product dimensional accuracy, surface quality, material properties, and crystal grain size can be collaboratively controlled, to achieve higher accuracy, better performance, and more outstanding extreme specifications. Product requirements of different hard-to-deform metal materials and different product specifications can be satisfied, to flexibly prepare metal pipe products with different material characteristics, which greatly improves production efficiency and effectively reduces production costs.