Effect of cryogenic cooling on the structure, hardness, and surface quality of 60C2A spring steel

1993 ◽  
Vol 64 (2) ◽  
pp. 172-174
Author(s):  
E. T. Brook-Levinson ◽  
I. P. Vasilenko ◽  
O. I. Koval ◽  
S. A. Tanayeva
Keyword(s):  
Surface Quality ◽  
Spring Steel ◽  
Cryogenic Cooling

Kryogenes Fräsen additiv gefertigter Bauteile/Cryogenic milling of additively manufactured components

2021 ◽  
Vol 111 (11-12) ◽  
pp. 824-828
Author(s):  
Kevin Gutzeit ◽  
Sebastian Greco ◽  
Benjamin Kirsch ◽  
C. Jan Aurich
Keyword(s):  
Surface Layer ◽  
Strain Hardening ◽  
Surface Quality ◽  
Industrial Applications ◽  
Cryogenic Cooling ◽  
Cryogenic Milling ◽  
Cooling Strategy ◽  
Hardened Surface ◽  
Eine Verbesserte

Die erreichbare Oberflächenqualität additiv gefertigter Bauteile ist für industrielle Anwendungen häufig unzureichend. Daher ist eine in der Regel spanende Nachbearbeitung der Bauteile unumgänglich. In diesem Beitrag wird die spanende Nachbearbeitung durch eine kryogene Kühlung ergänzt. Hierdurch wird die thermische Belastung in der Werkstückrandschicht reduziert, um so eine Kaltverfestigung zu begünstigen. Es konnte eine verbesserte Oberflächenqualität sowie eine Randschichthärtung realisiert werden.   The surface quality of additively manufactured components is often insufficient for industrial applications. As a result, additional processes are necessary to improve the surface quality. In the investigations presented, a cryogenic cooling is used when milling additively manufactured components. The cryogenic cooling strategy favors the introduction of strain hardening effects into the surface layer. An improved surface quality as well as a hardened surface layer were realized.

Effect of cryogenic cooling on machinability and surface quality of bio-degradable ZK60 Mg alloy

2015 ◽  
Vol 87 ◽  
pp. 1030-1036 ◽  
Author(s):  
S. Dinesh ◽  
V. Senthilkumar ◽  
P. Asokan ◽  
D. Arulkirubakaran
Keyword(s):  
Surface Quality ◽  
Cryogenic Cooling ◽  
Mg Alloy

Actively Cooled and Activated Coolant for Grinding Brittle Materials

2008 ◽  
Vol 389-390 ◽  
pp. 338-343 ◽  
Author(s):  
Y. Gao ◽  
J. Xin ◽  
H. Lai
Keyword(s):  
Surface Roughness ◽  
Surface Morphology ◽  
Surface Quality ◽  
Experimental Studies ◽  
Brittle Materials ◽  
Cryogenic Cooling ◽  
Experimental Results ◽  
Cooling Method ◽  
Cooling Methods

An actively cooled and activated cooling approach is proposed and examined in this project in order to deal with the problems associated with methods such as the cryogenic cooling method. It is also aimed to further improve the surface quality of the workpiece after grinding by combining the advantages of the existing cooling methods. Both computational and experimental studies were conducted for grinding the brittle materials with the proposed approach. Optical examinations were used to study the surface morphology. The experimental results show that the surface quality can be improved by up to 23.75% on average in terms of surface roughness Ra. The computational test reveals that the heat can be taken away more effectively by the proposed approach.

Schwingungsüberlagertes Axialformen/Superimposed Oscillated Axial Forming

2020 ◽  
Vol 110 (11-12) ◽  
pp. 838-843
Author(s):  
Philipp Müller ◽  
Bernd-Arno Behrens ◽  
Sven Hübner ◽  
Hendrik Vogt ◽  
Daniel Rosenbusch ◽  
...  
Keyword(s):  
Surface Quality ◽  
Economic Importance ◽  
Combined Effect ◽  
Wird Eine ◽  
Forming Force ◽  
Forming Process ◽  
Forming Technology ◽  
Great Economic Importance ◽  
Gear Geometry

Techniken zur Steigerung der Formgebungsgrenzen in der Umformtechnik sind von hoher wirtschaftlicher Bedeutung. In dieser Arbeit wird eine Schwingungsüberlagerung im Krafthauptfluss eines Axialformprozesses zur Ausprägung einer Verzahnungsgeometrie untersucht. Die Auswirkungen der Schwingung auf die erzielbare Ausfüllung der Zahnkavitäten werden analysiert sowie die Parameter Schmierung und Oberflächengüte der Halbzeuge in ihrer kombinierten Wirkung untersucht. Es konnte eine Reduzierung der mittleren Umformkraft sowie eine Erhöhung der Formfüllung festgestellt werden. Techniques for extending the production limits in forming technology are of great economic importance. In this research, a superimposed oscillation in the main force flow of an axial forming process to form an axial gear geometry is investigated. The effects of the superimposed oscillation on the achievable form-filling of the tooth cavities are analyzed and the parameters lubrication and surface quality of the semi-finished products are investigated in their combined effect. A reduction of the averaged forming force as well as an increase of the form-filling could be achieved.

scholarly journals Face Grinding Surface Quality of High Volume Fraction SiCp/Al Composite Materials

2021 ◽  
Vol 34 (1) ◽  
Author(s):  
Xu Zhao ◽  
Yadong Gong ◽  
Guiqiang Liang ◽  
Ming Cai ◽  
Bing Han
Keyword(s):  
Friction Coefficient ◽  
Surface Morphology ◽  
Surface Quality ◽  
Volume Fraction ◽  
High Volume ◽  
Spindle Speed ◽  
High Volume Fraction ◽  
Machining Parameters ◽  
Al Composite

AbstractThe existing research on SiCp/Al composite machining mainly focuses on the machining parameters or surface morphology. However, the surface quality of SiCp/Al composites with a high volume fraction has not been extensively studied. In this study, 32 SiCp/Al specimens with a high volume fraction were prepared and their machining parameters measured. The surface quality of the specimens was then tested and the effect of the grinding parameters on the surface quality was analyzed. The grinding quality of the composite specimens was comprehensively analyzed taking the grinding force, friction coefficient, and roughness parameters as the evaluation standards. The best grinding parameters were obtained by analyzing the surface morphology. The results show that, a higher spindle speed should be chosen to obtain a better surface quality. The final surface quality is related to the friction coefficient, surface roughness, and fragmentation degree as well as the quantity and distribution of the defects. Lower feeding amount, lower grinding depth and appropriately higher spindle speed should be chosen to obtain better surface quality. Lower feeding amount, higher grinding depth and spindle speed should be chosen to balance grind efficiently and surface quality. This study proposes a systematic evaluation method, which can be used to guide the machining of SiCp/Al composites with a high volume fraction.

Simulation and Productive Practice of 60 Tons Huge Rectangular Ingot by Wind Cooling

2011 ◽  
Vol 233-235 ◽  
pp. 2714-2717
Author(s):  
Xin Gang Ai ◽  
Sheng Li Li ◽  
Dong Wei Zhang ◽  
Nan Lv ◽  
Jun Tao
Keyword(s):  
Mathematical Simulation ◽  
Surface Quality ◽  
Solidification Time ◽  
Special Method ◽  
Cooling Process ◽  
Heavy Plate ◽  
Simulation Results

Huge rectangular ingots becomes crying needs in the condition of lots of heavy plate mills more than 5m have been in operation. In this paper, a special method of wind cooling outside mould has been presented and applied to produce 60t rectangular ingot. Mathematical simulation results tell us that by wind cooling, the solidification time of the 60t ingot can be shortened by 67 minutes, internal soundness can be ensured. The wind cooling process can obviously improve microstructure and preventing skull patch by increasing the thickness of solidified shell. A 60 tons huge rectangular ingot is successfully produced by wind cooling, the surface quality of is very well and the internal soundness should be improved further.

Synthesis of high-temperature thermally expandable microcapsules and their effects on foaming quality and surface quality of foamed ABS materials

e-Polymers ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 519-527
Author(s):  
Wei Gong ◽  
Xianglin Pei ◽  
Xiaogang Yin ◽  
Daming Ban ◽  
Hai Fu ◽  
...  
Keyword(s):  
High Temperature ◽  
Surface Quality ◽  
Volume Fraction ◽  
Crosslinking Agent ◽  
Acrylonitrile Butadiene Styrene ◽  
Foaming Agent ◽  
Blowing Agent ◽  
Good Surface ◽  
Butadiene Styrene

AbstractIn this paper, acrylonitrile and hydroxypropyl acrylate are used as the binary polymerization monomers, and isooctane is used as the foaming agent to prepare high-temperature thermally expandable microcapsules. Analysis of the effect of blowing agent and crosslinking agent on the expansion properties of high-temperature thermally expandable microcapsules, the effects of foaming agent azodicarbonamide (ADCA) and micro-expansion capsule on the surface quality and foaming quality of foamed acrylonitrile–butadiene–styrene (ABS) products were investigated. The foamed product prepared by the high-temperature microcapsule has a good surface quality, the gloss is 52.3, the cell is not easily deformed, and the volume fraction is 4%; the foamed ABS/ADCA material has poor cell uniformity, the cell is easily deformed, the volume fraction is 6.5%, the surface quality is poor, and the gloss is only 8.7.

Laser polishing to improve the surface quality of CoCr and Ti6AL4V additively manufactured parts

2017 ◽  
Author(s):  
Wojciech S. Gora ◽  
Yingtao Tian ◽  
Marcus Ardron ◽  
Philip Prangnell ◽  
Nicholas J. Weston ◽  
...  
Keyword(s):  
Surface Quality ◽  
Laser Polishing
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