scholarly journals Investigation of Process Parameters in High-Speed Die-less Water Jet Spin-Forming of Copper Sheets

2021 ◽  
Author(s):  
Mehrdad Asadi ◽  
Mohsen Loh-Mousavi ◽  
Ali Heidari ◽  
Kamran Amini
Keyword(s):  
Surface Quality ◽  
High Speed ◽  
Rotation Speed ◽  
High Water ◽  
Water Jet ◽  
Wall Angle ◽  
Relative Water ◽  
Lathe Machine ◽  
Metal Spinning

Abstract A new forming method called high speed water jet spin-forming was developed. This new forming method is a combination of water jet incremental forming and sheet metal spinning without any mandrel. The forming speed has been significantly increased by spinning of the sheet using a lathe machine. The effects of the forming parameters such as water jet pressure, rotation speed and relative water jet diameter on formability and surface quality of deformed copper parts were investigated. The experimental results indicate that the water jet pressure and the sheet rotation speed have a significant effect on the final depth, wall angle, and surface smoothness. It was also concluded that the final depth exponentially increases as the sheet rotational speed reduced. In addition, when the water jet pressure is low, sheet rational speed does not play a significant role in the final depth of the specimen. Furthermore, it has been determined from the results that high water jet pressure plays an important role in improving the surface quality and wrinkling at different rotational speeds, and as the pressure is increased, the wrinkling decreases and thus the surface quality is improved.

The Metal Sheets Processed by AWJ. Analysis of the Surface Quality

2013 ◽  
Vol 837 ◽  
pp. 201-205 ◽  
Author(s):  
Carol Schnakovszky ◽  
Eugen Herghelegiu ◽  
Nicolae Catalin Tampu
Keyword(s):  
Surface Quality ◽  
High Speed ◽  
Experimental Tests ◽  
Water Jet ◽  
Machining Process ◽  
Abrasive Water Jet ◽  
Hard Materials ◽  
Water Jet Cutting ◽  
Metal Sheets

Abrasive water jet (AWJ) is a nonconventional machining process in which abrasive grains in a high-speed water jet collide with the sample and erode it. This technology has been developed as an alternative to the conventional processes in order to facilitate the processing of hard materials as stainless steel, titanium alloys, composite materials, etc. However, it is not limited only to hard materials, since it has been successfully applied to process softer materials as aluminum, copper, plastics. Also, the abrasive water jet technology can be used both, to process thin metal sheets and plates since it offers many advantages such as: good surface quality, no thermal distortions, minimal burrs, low machining force, high flexibility. The aim of the current paper was to study the surfaces quality of samples made by aluminium, A1050, processed by AWJ in case of using different working regimes. The experimental tests have been performed on the Hydro-jet Eco 0615 water jet cutting machine. The parameters that have been varied were pressure, feed rate, abrasive quantity, distance between the cutting head and working sample while the diameter of focusing tube and diameter of water nozzle have been kept constant. The parameters taken into account to quantify the quality of the processed surface were those defined in the ISO/WD/TC 44 N 1770 standard (fig. 1): width of the processed surface at the jet inlet (Li), width of the processed surface at the jet outlet (Lo), deviation from perpendicularity (u), inclination angle (α) and roughness (Ra).

scholarly journals Surface quality of high-speed cutting plates in flat grinding by new abrasive wheels of “Saint-Gobain Abrasive” company

2020 ◽  
Vol 971 ◽  
pp. 022077
Author(s):  
Nguyen Duy Canh ◽  
Nguyen Van Canh ◽  
Pham Xuan Hong ◽  
Nguyen Ngoc Hue ◽  
Tran Dinh Duy
Keyword(s):  
Surface Quality ◽  
High Speed ◽  
High Speed Cutting

scholarly journals Study on Surface Quality of Wood Processed by Water-jet Assisted Nanosecond Laser

BioResources ◽  
2018 ◽  
Vol 13 (2) ◽  
Author(s):  
Chunmei Yang ◽  
Ting Jiang ◽  
Yueqiang Yu ◽  
Guoqiang Dun ◽  
Yan Ma ◽  
...  
Keyword(s):  
Surface Quality ◽  
Water Jet ◽  
Nanosecond Laser

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.

Preliminary Experimental Study on Effect of Cutting Fluid on Milled Surface Quality of Iron-Base Superalloy

2014 ◽  
Vol 1077 ◽  
pp. 61-65
Author(s):  
Pei Yan ◽  
Xiang Su ◽  
Gang Wang ◽  
Yi Ming Rong
Keyword(s):  
Experimental Study ◽  
Surface Quality ◽  
High Speed ◽  
Cutting Fluid ◽  
Cutting Fluids ◽  
Machined Surface ◽  
Iron Base ◽  
Milled Surface ◽  
Base Superalloy

As the development of new materials and high speed machining, cutting fluid becomes more and more important because of its functions of cooling, lubrication, corrosion protection and cleaning. The main purposes of cutting fluid are decreasing temperature, reducing friction, extending tool life and improving machining efficiency. In precision machining, high machined surface integrity is the most important. In this paper, a preliminary experimental study on effect of two different cutting fluids on milled surface quality of iron-base superalloy was taken. The surface morphology, roughness, micro hardness and residual stress of the machined surface were investigated. The results showed that the material properties and geometric characteristics of the machined surface were significantly affected by cutting fluid conditions. The effect of cutting fluid on machined surface quality and service performance will become an important research direction. This paper also suggests the main contents of the further research on effect of cutting fluids on machined surface.

Modal Analysis of Ballooning Strings With Small Sag

1999 ◽  
Author(s):  
Rongjun Fan ◽  
Sushil K. Singh ◽  
Christopher D. Rahn
Keyword(s):  
Steady State ◽  
High Speed ◽  
Natural Frequencies ◽  
Rotation Speed ◽  
Equations Of Motion ◽  
Three Dimensional ◽  
Mode Shapes ◽  
Theoretical Predictions ◽  
Nonlinear Equations Of Motion

Abstract During the manufacture and transport of textile products, yarns are rotated at high speed and form balloons. The dynamic response of the balloon to varying rotation speed, boundary excitation, and disturbance forces governs the quality of the associated process. Resonance, in particular, can cause large tension variations that reduce product quality and may cause yarn breakage. In this paper, the natural frequencies and mode shapes of a single loop balloon are calculated to predict resonance. The three dimensional nonlinear equations of motion are simplified via small steady state displacement (sag) and vibration assumptions. Axial vibration is assumed to propagate instantaneously or in a quasistatic manner. Galerkin’s method is used to calculate the mode shapes and natural frequencies of the linearized equations. Experimental measurements of the steady state balloon shape and the first two natural frequencies and mode shapes are compared with theoretical predictions.

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