Enhancing surface integrity by high-speed extrusion machining

被引：1
|
作者：
Liu, Yao [1 ]
Cai, Songlin [2 ]
Shang, Xinchun [1 ]
Dai, Lanhong [3 ]
机构：
[1] Univ Sci & Technol Beijing, Sch Math & Phys, Beijing 100083, Peoples R China
[2] State Grid Corp China, China Elect Power Res Inst, Beijing 100192, Peoples R China
[3] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
来源：
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY | 2017年 / 89卷 / 5-8期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
High-speed extrusion machining; Surface integrity; Characteristic instability time; Chip morphology transition; CHIP FORMATION; MAGNESIUM ALLOY; CUTTING SPEED; SHEAR; INSTABILITY; FRACTURE; MODEL;
D O I：
10.1007/s00170-016-9252-6
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
High-speed machining (HSM) is an advanced machining technology to form components. However, the poor surface integrity tends to appear due to chip flow instability in HSM. It is found that the surface integrity results from the competition of shear deformation instability between in primary shear zone (PSZ) and in separating shear zone (SSZ). To improve the surface integrity of machined components, the systematic high-speed extrusion machining (HSEM) experiments of magnesium alloy AZ31B with different constraint extrusion factors (CEFs) were carried out. The instability of shear deformation in PSZ is suppressed, and the microwaves on machined surface disappear when CEF is equal to or larger than a certain value. The measurements of the machined surface show that an improvement of surface integrity is achieved if CEF exceeds a certain value. The theoretical model for HSEM was established to elucidate the critical CEF. The underlying physics of surface integrity in HSEM is further revealed. The experimental results verify the validity of the theoretical model.
引用
收藏
页码：2141 / 2150
页数：10
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