Effect of the Regimes of Machining Butting Edges on the Quality of Permanent Joints Made by Fusion Welding when Assembling Aircraft Titanium Structures

2021 ◽  
pp. 67-79
Author(s):  
V.I. Muravyev ◽  
P.V. Bakhmatov ◽  
V.V. Grigoriev
Keyword(s):  
High Speed ◽  
Electron Beam Welding ◽  
Roughness Parameter ◽  
Fusion Welding ◽  
Surface Layers ◽  
Near Surface ◽  
High Speed Milling ◽  
Condensed Moisture ◽  
Acceptable Parameter

The article presents the results of the study of the effect of machining on the quality of permanent joints made by fusion welding. The effects of various types of machining (high-speed milling, cutting with guillotine shears, grinding) on the level of defectiveness of permanent joints made by automatic argon-arc and electron-beam welding have been determined. It was found that it is incorrect to assess the quality of machining butting edges for welding by the roughness parameter. The most acceptable parameter is the saturation by capillary-condensed moisture. It is shown that the thermal processes occurring during high-speed milling in the near-surface and surface layers, regardless of the roughness, lead not only to the minimum saturation parameter of capillary-condensed moisture (from 1.12 to 2.18), but also to dehydrogenization in the surface layer of the butting edges of future permanent joints. The obtained results of the research can be applied in technological processes of production of aircraft large load-bearing elements performed by welding.

scholarly journals Effect of High Speed Milling Process Parameters on the Milling Force and Surface Topography of AM50A Magnesium Alloy

2018 ◽  
Vol 36 (1) ◽  
pp. 124-131
Author(s):  
Hongji Zhang ◽  
Yuanyuan Ge ◽  
Hong Tang ◽  
Yaoyao Shi ◽  
Zengsheng Li
Keyword(s):  
Magnesium Alloy ◽  
Surface Quality ◽  
High Speed ◽  
Milling Process ◽  
Spindle Speed ◽  
Feed Speed ◽  
Milling Force ◽  
High Speed Milling ◽  
Milling Parameters

Within the scope of high speed milling process parameters, analyzed and discussed the effects of spindle speed, feed rate, milling depth and milling width on milling forces in the process of high speed milling of AM50A magnesium alloy. At the same time, the influence of milling parameters on the surface roughness of AM50A magnesium alloy has been revealed by means of the measurement of surface roughness and surface micro topography. High speed milling experiments of AM50A magnesium alloy were carried out by factorial design. Form the analysis of experimental results, The milling parameters, which have significant influence on milling force in high speed milling of AM50A magnesium alloy, are milling depth, milling width and feed speed, and the nonlinear characteristics of milling force and milling parameters. The milling force decreases with the increase of spindle in the given mill parameters. For the effects of milling parameters on surface quality of the performance, in the milling depth and feeding speed under certain conditions with the spindle speed increases the surface quality of AM50A magnesium alloy becomes better with the feed speed increases the surface quality becomes poor. When the spindle speed is greater than 12000r/min, the milling depth is less than 0.2mm, and the feed speed is less than 400mm/min, the milling surface quality can be obtained easily.

Amortization and Recrystallization of 6H-SiC by ion Beam Irradiation

1994 ◽  
Vol 339 ◽  
Author(s):  
V. Heera ◽  
R. Kögler ◽  
W. Skorupa ◽  
J. Stoemenos
Keyword(s):  
Ion Irradiation ◽  
Ion Beam ◽  
Surface Region ◽  
Ion Beam Irradiation ◽  
Surface Layers ◽  
Near Surface ◽  
Transmission Electron ◽  
Amorphous Surface ◽  
Amorphous Sic

ABSTRACTThe evolution of the damage in the near surface region of single crystalline 6H-SiC generated by 200 keV Ge+ ion implantation at room temperature (RT) was investigated by Rutherford backscattering spectroscopy/chanelling (RBS/C). The threshold dose for amorphization was found to be about 3 · 1014 cm-2, Amorphous surface layers produced with Ge+ ion doses above the threshold were partly annealed by 300 keV Si+ ion beam induced epitaxial crystallization (IBIEC) at a relatively low temperature of 480°C For comparison, temperatures of at least 1450°C are necessary to recrystallize amorphous SiC layers without assisting ion irradiation. The structure and quality of both the amorphous and recrystallized layers were characterized by cross-section transmission electron microscopy (XTEM). Density changes of SiC due to amorphization were measured by step height measurements.

The Study on Three-Dimensional Roughness of Machined Surface in High Speed Milling of SiCp/Al Composites

2011 ◽  
Vol 188 ◽  
pp. 179-183 ◽  
Author(s):  
Yang Jun Wang ◽  
M. Zhou ◽  
Y.H. Zhao
Keyword(s):  
Root Mean Square ◽  
Root Mean Square Deviation ◽  
High Speed ◽  
Three Dimensional ◽  
Roughness Parameter ◽  
Cutting Parameters ◽  
Mean Square ◽  
Mean Square Deviation ◽  
Machined Surface ◽  
High Speed Milling

For the purpose of investigating the effect on surface micro-topography of cutting parameters in high speed milling of SiCp/Al Composites, the high speed milling experiments were performed .The machined surface was measured by Taylor Hobson roughness tester and OLS3000 Confocal Laser Scanning Microscope. The acquired surface data was dealt with the three-dimensional roughness method. The three-dimensional root-mean-square deviation of the surface Sq and two-dimensional root-mean-square deviation Rq were compared. The effects of cutting parameters on three-dimensional roughness parameter were also investigated. The results showed that both feed rate and depth of cut have a little effect on the value of three-dimensional roughness parameter，and the cutting speed is the main affecting factor.

Cutting Forces and Vibration of Pockets Corner by High Speed Milling

2009 ◽  
Vol 69-70 ◽  
pp. 59-63 ◽  
Author(s):  
Cheng Yong Wang ◽  
De Weng Tang ◽  
Zhe Qin ◽  
Z.G. Chen ◽  
Ying Ning Hu ◽  
...  
Keyword(s):  
Cutting Forces ◽  
High Speed ◽  
Sudden Change ◽  
Poor Quality ◽  
Depth Of Cut ◽  
High Speed Milling ◽  
Radial Depth ◽  
Cutting Direction ◽  
Cutting Speeds

When the pocket in die and mould is machined by high speed milling (HSM), the cutting forces increase and vibration fluctuates at the pocket corner because of the sudden change of cutting direction in general. It will cause serious wear and possible breakage of cutting tool, and poor quality of parts. By means of experiments, the cutting forces and vibration at the pocket corner with different HSM conditions are measured. The results show that the sharper pocket corner, higher cutting speeds, larger feed rate per tooth and radial depth of cut, will result in increasing of cutting forces and vibration amplitude. Thus, it will lead to be unstable during the process of high speed milling pocket corner.

Selected 5-Axis Strategies for High-Speed Milling of Thin-Walled Parts

2013 ◽  
Vol 467 ◽  
pp. 466-469 ◽  
Author(s):  
Martin Kováč ◽  
Jozef Peterka
Keyword(s):  
High Speed ◽  
Machined Surface ◽  
High Speed Milling ◽  
Experimental Part ◽  
New Methods ◽  
Flexible Parts ◽  
Thin Walled ◽  
Five Axis ◽  
Five Axes

The article deals with the proposed 5-axis strategies of high-speed milling of thin-walled parts. I proposed three ways of material take-in. It is an advantage that by this milling the shaft of the tool is not in contact with the machined surface. Each tool contact with the machined surface leaves an unwanted track on the parts surface. Article present new methods for five axes high speed milling flexible parts. Experimental part was five axis high speed milling and measuring quality of surface. Results were evaluated by statistic methods by software Minitab.

Tool Wear and Surface Integrity in High Speed Milling of a Near Alpha Titanium Alloy

2006 ◽  
Vol 532-533 ◽  
pp. 644-647
Author(s):  
Yi Ping Zhang ◽  
Jiu Hua Xu ◽  
Guo Sheng Geng
Keyword(s):  
Titanium Alloy ◽  
Tool Wear ◽  
Surface Integrity ◽  
High Speed ◽  
Cutting Tools ◽  
High Speed Milling ◽  
Good Surface ◽  
Alpha Titanium ◽  
Series Of Experiments

Ti-6.5Al-2Zr-1Mo-1V is a near alpha titanium alloy strengthened by solid solution with Al and other components. In this study, a series of experiments on tool wear and surface integrity in high speed milling (HSM) of this alloy were carried out. The tool lives under different cutting speeds were studied and the corresponding empirical equation of tool life was derived. Additionally, the wear mechanism of cutting tools was also discussed. Finally, surface integrity, including surface roughness, metallograph, work hardening and residual stresses, were examined and analysed. The result shows that good surface quality of workpiece could be obtained in HSM of the alloy.

Enhancing the durability of cutting carbide tools by controlling the state and properties of its surface layers using complex chemical and thermal treatment

2020 ◽  
Author(s):  
E.E. Bobylyov
Keyword(s):  
Cutting Tool ◽  
Diffusion Coating ◽  
Roughness Parameter ◽  
Field Tests ◽  
Sharp Change ◽  
Functional Coatings ◽  
Surface Layers ◽  
Metal Melts ◽  
Product Surface

A current way of increasing cutting efficiency in the turning operation is applying functional coatings based on carbides, nitrides, carbonitrides, etc. on the cutting tool surface. Most technologies for applying functional coatings are supposed to use technically sophisticated, expensive equipment. In addition, the coatings have a sharp change in properties at the coating-coated material boundary. The technology of diffusion saturation from the medium of low-melting liquid metal melts lacks these disadvantages. The aim of the work was to study the effect of the formation of a coating based on titanium carbide on the surface of a cutting tool made of hard TiC-WC-Co and WC-Co alloys on its wear resistance and the quality of the product surface after turning. The research methods included field tests, micro-x-ray spectral analysis, optical microscopy, and microdurametric tests. The paper presents the results of research of turning of materials of various cutting group using a carbide tool with a functional diffusion coating obtained due to saturation in the melt containing Pb, Bi, Li, Ti. The resulting coatings had a thickness of 3-6 microns, and contributed to an increase in tool life up to 7.4 times compared to the tools with PVD coating and tools without coatings as well as a decrease of the roughness parameter Ra of the treated surface up to 2 times.

scholarly journals Improving the Efficiency of Milling with using Of the Milling Cutter with Cover (High Speed Milling (HSM))

2020 ◽  
Vol 9 (4) ◽  
pp. 3310-3316
Keyword(s):  
Surface Quality ◽  
High Speed ◽  
Cutting Speed ◽  
Milling Cutter ◽  
High Speed Milling ◽  
Increase Productivity ◽  
Improving Accuracy

The method of high-speed milling has many advantages than conventional milling. Very often, high-speed milling is considered simply a way to increase productivity due to a higher cutting speed than commonly used. It is rarely emphasized that quality of the product can be improved by improving accuracy and improving the surface quality of the cutter.

An Investigation of Wear of Ball End Milling Cutter for High-Speed Milling of Hardened Cr12MoV Steel

2014 ◽  
Vol 800-801 ◽  
pp. 475-478 ◽  
Author(s):  
Cai Xu Yue ◽  
Hui Ze Feng ◽  
Jing Ma ◽  
Zhao Nan Zhong ◽  
Fei Liu
Keyword(s):  
Tool Life ◽  
High Speed ◽  
End Milling ◽  
Helix Angle ◽  
Rake Angle ◽  
Milling Cutter ◽  
High Speed Milling ◽  
Ball End Milling ◽  
Edge Stiffness

The high-speed milling experiments on hardened Cr12MoV steel were carried out with ball end milling cutter of different edge parameters. The influences of helix angle and rake angle on tool life and surface roughness were focused on. Meanwhile, the impacts of edge parameters on cutting edge stiffness and flank wear were analyzed on the condition of high-speed milling. It carried out that smaller helix angle and negative rake angle selected during high speed milling can guarantee quality of surface manufactured as well as longer tool life.

Research on the Influences of High-Speed Milling Parameters on Surface Work-Hardening

2013 ◽  
Vol 662 ◽  
pp. 273-276
Author(s):  
Jian Xin Pan ◽  
Qiang Li
Keyword(s):  
Work Hardening ◽  
High Speed ◽  
End Milling ◽  
Cutting Parameters ◽  
Processing Efficiency ◽  
High Speed Milling ◽  
Milling Parameters ◽  
Orthogonal Experiments ◽  
Surface Work

The orthogonal experiments of end milling were designed. Workpiece surfaces hardening were studied in high-speed milling. The results indicate that the degree of surface work-hardening in high-speed milling 8407 mold-steel is lower than that in conventional speed milling;By choosing the appropriate cutting parameters, to improve the surface quality of the workpieces and the processing efficiency is beneficial;Through changing the high-speed milling parameters to control the work hardening, the effect is not so obvious.

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