Formation mechanism of white layer in the high-speed cutting of hardened steel under cryogenic liquid nitrogen cooling

2021 ◽  
pp. 117469
Author(s):  
Shixiong Wu ◽  
Guangdong Liu ◽  
Wenfeng Zhang ◽  
Wanglin Chen ◽  
Chengyong Wang
Keyword(s):  
Liquid Nitrogen ◽  
Formation Mechanism ◽  
High Speed ◽  
White Layer ◽  
Cryogenic Liquid ◽  
Hardened Steel ◽  
High Speed Cutting ◽  
Liquid Nitrogen Cooling

Development of a Superconducting Transformer for Rolling Stock

2006 ◽  
Vol 47 ◽  
pp. 204-211
Author(s):  
Hiroyuki Fujimoto ◽  
Hiroshi Hata ◽  
Hiroki Kamijo ◽  
Ken Nagashima ◽  
Kazuya Ikeda ◽  
...  
Keyword(s):  
High Temperature ◽  
Liquid Nitrogen ◽  
High Speed ◽  
Rolling Stock ◽  
Maximum Output ◽  
Superconducting Wire ◽  
High Temperature Superconducting ◽  
Highly Efficient ◽  
Liquid Nitrogen Cooling

Having undertaken studies into a lightweight and highly efficient superconducting transformer for rolling stock, we developed a prototype with a primary winding, four secondary windings and a tertiary winding using Bi-2223 high temperature superconducting wire. Its primary voltage is 25kV, which is widely adopted as the catenary voltage on the world's high-speed lines. We adopted liquid nitrogen cooling, the weight being 1.71t excluding the refrigerator. The maximum output available to maintain superconductivity is 3.5MVA. We also introduce railways in Japan.

Finite Element Simulation and Experiment of Chip Formation during High Speed Cutting of Hardened Steel

2010 ◽  
Vol 29-32 ◽  
pp. 1838-1843 ◽  
Author(s):  
Chun Zheng Duan ◽  
Hai Yang Yu ◽  
Yu Jun Cai ◽  
Yuan Yuan Li
Keyword(s):  
Finite Element ◽  
Cutting Force ◽  
High Speed ◽  
Chip Morphology ◽  
Hardened Steel ◽  
High Speed Machining ◽  
Serrated Chip ◽  
High Speed Cutting ◽  
Element Simulation ◽  
Aisi 1045

As an advanced manufacturing technology which has been developed rapidly in recent years, high speed machining is widely applied in many industries. The chip formation during high speed machining is a complicated material deformation and removing process. In research area of high speed machining, the prediction of chip morphology is a hot and difficult topic. A finite element method based on the software ABAOUS which involves Johnson-Cook material model and fracture criterion was used to simulate the serrated chip morphology and cutting force during high speed cutting of AISI 1045 hardened steel. The serrated chip morphology and cutting force were observed and measured by high speed cutting experiment of AISI 1045 hardened steel. The effects of rake angle on cutting force, sawtooth degree and space between sawteeth were discussed. The investigation indicates that the simulation results are consistent with the experiments and this finite element simulation method presented can be used to predict the chip morphology and cutting force accurately during high speed cutting of hardened steel.

Study on the Micro-Topography and Texture Characteristic of Machined Surface in High Speed Turning for Carbon Steel

2004 ◽  
Vol 471-472 ◽  
pp. 238-242
Author(s):  
Bang Yan Ye ◽  
Jin Xu ◽  
Xiao Chu Liu ◽  
Yan Ming Quan
Keyword(s):  
High Speed ◽  
White Layer ◽  
Cutting Temperature ◽  
Forming Process ◽  
Texture Characteristic ◽  
Machined Surface ◽  
High Speed Cutting ◽  
High Speed Turning ◽  
Texture Characteristics ◽  
Micro Topography

In this article, the micro-topography and texture characteristics of machined surface under the condition of high speed cutting are analyzed based on experimental observation. The forming process of machined surface and cause of the appearance are also discussed. The experimental results show that furrow and ridges, surface white layer and molten metal daub by the feed motion of cutting tool are found on machined surface due to the effect of high cutting temperature and rotating of workpiece in high speed turning process.

Study of PCBN Cutting Tools Wear in High Speed Cutting Hardened Steel GCr15

2010 ◽  
Vol 431-432 ◽  
pp. 245-248
Author(s):  
Yu Wang ◽  
Yuan Sheng Zhai ◽  
Fu Gang Yan ◽  
Xian Li Liu
Keyword(s):  
Wear Mechanisms ◽  
High Speed ◽  
Cutting Tools ◽  
Cutting Parameters ◽  
Hardened Steel ◽  
Structure Design ◽  
High Speed Cutting ◽  
Use Efficiency ◽  
Tools Wear ◽  
Research Stage

PCBN cutting tools is in high speed, high temperature and high pressure environment when high speed precision hard cutting hardened steel. Shear extrusion and slip effect in high speed cutting, cutting tools wear mechanisms are different from common cutting, even cutting tools wear mechanisms in high speed is in research stage at present. In this paper, coated PCBN cutting tools wear mechanisms in high speed cutting(v＝200~600m/min) GCr15 (HRC62-64) is studied, it is helpful to obtain cutting tools structure design, cutting parameters and improve cutting tools use efficiency.

Fragmented chip formation mechanism in high-speed cutting from the perspective of stress wave effect

CIRP Annals ◽  
2021 ◽  
Author(s):  
Jun Zhang ◽  
Zhechao Liu ◽  
Hongguang Liu ◽  
Xiang Xu ◽  
José Outeiro ◽  
...  
Keyword(s):  
Stress Wave ◽  
Formation Mechanism ◽  
Chip Formation ◽  
High Speed ◽  
Wave Effect ◽  
High Speed Cutting ◽  
Chip Formation Mechanism

Research on Machined Surface Quality of High Speed Hard Machining for Harden Steel

2012 ◽  
Vol 500 ◽  
pp. 82-88 ◽  
Author(s):  
Cai Xu Yue ◽  
Xian Li Liu ◽  
Da Wei Sun ◽  
Ming Yang Wu
Keyword(s):  
Surface Quality ◽  
High Speed ◽  
Cutting Parameters ◽  
Hardened Steel ◽  
Machining Process ◽  
Machined Surface ◽  
High Speed Cutting ◽  
Machined Surface Quality ◽  
Side Flow

For its good processing flexible, economic and environmental protection performance, hardened steel GCr15 is used widely in car and energy industry. Although surface quality in machining process is not controlled well, that restricts application of hardened steel GCr15 extensive to a certain degree. Therefore, this study revealed the effect of cutting parameters on surface roughness. Also influence of cutting conditions on surface morphology and organization generation mechanism of subsurface were stuied for high-speed cutting hardened steel GCr15. Appear reasons of plastic side flow on surface was researched. Also, effect of tool wear on surface quality was studied as well. The research results provided theoretical basis for rational choice for high speed hardened steel cutting process.

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