公开(公告)号：KR1020130068827A

公开(公告)日：2013-06-26

申请号：KR1020110136224

申请日：2011-12-16

Applicant: 포항공과대학교 산학협력단

Inventor： 김형섭 ,  엄호용 ,  윤은유 ,  이동준 ,  이성

IPC: B21D11/02 ,  B21D11/14 ,  B21D7/00 ,  C21D7/02

CPC classification number: C22F1/00 ,  B21C23/01 ,  B21C37/18 ,  B21D11/14 ,  B21D22/022 ,  B21D35/002 ,  B21D51/10 ,  B21J1/025 ,  B21J5/063 ,  B21K21/02 ,  C21D7/02 ,  C21D9/0068 ,  C21D9/10

Abstract: PURPOSE: A torsion severe plastic deformation method of conical metal tube is provided to make a micro-structure to microcrystalline or nano-crystalline, thereby improving the mechanical property of conical metal tube. CONSTITUTION: A torsion severe plastic deformation method of conical metal tube performs the following steps. A punch suitable for the inner shape of the conical metal pipe is mounted in the inside of conical metal pipe. A mold suitable for the outer shape of the conical metal pipe is mounted in the outside of conical metal pipe. A micro-structure of conical metal pipe is formed into microcrystalline or nano-crystalline through the shear deformation obtained by applying the compression and torsion to the conical metal pipe by means of the punch and the mold. The shear deformation is obtained by rotating the punch after the punch is pressured by the mold. [Reference numerals] (AA) Initial piece shape; (BB) After process piece shape; (CC) Piece input step; (DD) Mold insertion step; (EE) Twisting; (FF) Compression and twisting step; (GG) Compression strength

Abstract translation: 目的：提供锥形金属管的扭转严重塑性变形方法，使微结构微晶或纳米晶体化，从而提高锥形金属管的机械性能。 构成：锥形金属管的扭转严重塑性变形方法执行以下步骤。 适用于锥形金属管的内部形状的冲头安装在锥形金属管的内部。 适用于圆锥形金属管的外形的模具安装在锥形金属管的外侧。 锥形金属管的微结构通过剪切变形形成为微晶或纳米晶体，通过冲压和模具将压缩和扭转施加到锥形金属管而获得。 剪切变形是通过模具冲压冲头后旋转冲头获得的。 （附图标记）（AA）初始片形状; （BB）加工件形状; （CC）件输入步骤; （DD）模具插入步骤; （EE）扭转; （FF）压缩和扭转步骤; （GG）抗压强度