Influence of Tool Holder Types on Vibration in Rough Milling of AZ91D Magnesium Alloy

The article presents the results of an analysis of the influence of the technological parameters related to tool holder types on the vibrations occurring during the milling of AZ91D magnesium alloy. Magnesium alloys are very low-density materials and, therefore, are increasingly being considered as replacement materials for the more commonly used aluminium alloys. The tool used in the study was a carbide end mill with TiAlN coating, clamped in three different types of tool holder: ER collet, heat shrink, and Tendo E hydraulic. The milling tests used straight toolpaths at varied cutting speeds and feed per tooth values. Based on the vibration displacement and acceleration signals recorded during the machining tests, the following were analysed: maximum value, amplitude, and root mean square (RMS) value of the vibrations. As part of the study, composite multiscale entropy (CMSE) analysis was also performed, describing the level of disorderliness of the obtained vibration signals. The increase in machining parameters caused an increase in the values characterising the displacement and acceleration of the vibrations. It was noted that multiscale entropy might be an important parameter describing the vibration signal (both displacement and acceleration).

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Numerical Simulation of Thixoforging of an AZ91D Magnesium Alloy Magazine Plate and Experimental Validation

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.141-143.623 ◽

2008 ◽

Vol 141-143 ◽

pp. 623-628 ◽

Cited By ~ 1

Author(s):

Ju Fu Jiang ◽

Ying Wang ◽

Zhi Ming Du ◽

Shou Jing Luo

Keyword(s):

Numerical Simulation ◽

Magnesium Alloy ◽

Experimental Validation ◽

Equivalent Strain ◽

Technological Parameters ◽

Billet Temperature ◽

Az91d Magnesium Alloy ◽

Punch Velocity ◽

Die Temperature ◽

Semi Solid

In this paper, thixoforging of a magazine plate made of AZ91D magnesium alloy were investigated by means of numerical simulation and experiments. Numerical simulation results show that with increasing punch displacement, local bending, formation of a concave shell part and bulk plastic deformation occurs in billet continuously. Equivalent strain and stress increase and the temperature of the semi-solid billet decreases. When the temperature of the semi-solid billet or the die temperature is elevated, equivalent stain and stress decrease. Optimal technological parameters such as a billet temperature of 545°C, die temperature of 450°C and punch velocity of 15 mm/s were obtained by numerical simulation. Experimental results demonstrate that magazine plates with high mechanical properties such as tensile strength of 316.8 MPa, yield strength of 228.3 MPa and elongation of 12.6 % can be manufactured successfully when the optimal technological parameters selected according to the results of numerical simulation are applied.

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Research on Thixoforging Magazine Plate of AZ91D Magnesium Alloy in Semi-Solid State

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.116-117.267 ◽

2006 ◽

Vol 116-117 ◽

pp. 267-270 ◽

Cited By ~ 2

Author(s):

Ju Fu Jiang ◽

Shou Jing Luo

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Solid State ◽

Magnesium Alloy ◽

Room Temperature ◽

Great Influence ◽

Technological Parameters ◽

Az91d Magnesium Alloy ◽

Preheating Temperature ◽

Semi Solid

The thixoforging process in which magazine plates of AZ91D magnesium alloy were thixoforged in semi-solid state using semi-solid billets prepared by common SIMA method and new SIMA method was investigated. The results show that the pressure has a great influence on the semi-solid billet’s ability to fill die’s cavity. When the pressure is 500KN, the semi-solid billet can’t fill the die’s cavity completely. When the pressure is 2000KN, the semi-solid billet can fill the die’s cavity completely. Room temperature mechanical properties, such as yield strength of 201.4MPa, ultimate tensile strength of 321.8MPa and elongation of 15.3%, can be obtained successfully when the technological parameters, including pressure of 200KN, die preheating temperature of 723K, holding for 20min at 818K, are satisfied. Comparing with common SIMA, mechanical properties of room temperature and high temperature at 373Kare enhanced heavily.

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Influence of Laser Parameters on Magnesium Alloy Surface Modification

Materials Science Forum ◽

10.4028/www.scientific.net/msf.704-705.1216 ◽

2011 ◽

Vol 704-705 ◽

pp. 1216-1218

Author(s):

Kai Sun ◽

Sen Yang ◽

Feng Xia Liu

Keyword(s):

Corrosion Resistance ◽

Surface Modification ◽

Magnesium Alloy ◽

Laser Power ◽

Surface Engineering ◽

Laser Surface ◽

Alloy Surface ◽

Technological Parameters ◽

Az91d Magnesium Alloy ◽

Surface Modified

It’s an important content to treat on the magnesium alloy surface for improving it’s abrasion performance and corrosion resistance in the field of surface engineering nowerdays. This research takes the AZ91D magnesium alloy and Aluminum as a substrate and powdered alloy respectively.It takes the laser surface modified technology as the method so that to enhance the corrosion resistance of the magnesium alloy surface.The optimization technological parameters are obtained by discussing the influence rule on laser power to corrosion resistance of AZ91D substrate and Mg-Al modified level.

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Dimensional Accuracy and Surface Quality of AZ91D Magnesium Alloy Components after Precision Milling

Materials ◽

10.3390/ma14216446 ◽

2021 ◽

Vol 14 (21) ◽

pp. 6446

Author(s):

Jarosław Korpysa ◽

Józef Kuczmaszewski ◽

Ireneusz Zagórski

Keyword(s):

Magnesium Alloy ◽

Machine Tool ◽

Surface Quality ◽

Dimensional Accuracy ◽

Milling Process ◽

Numerical Control ◽

Depth Of Cut ◽

Technological Parameters ◽

Az91d Magnesium Alloy ◽

End Mills

This study investigates a precision milling process conducted with the use of conventional end mills and a standard CNC (Computer Numerical Control) machine tool. Milling tests were performed on samples of AZ91D magnesium alloy using TiB2- and TiAlN-coated three-edge end mills measuring 16 mm in diameter. The following technological parameters were made variable: cutting speed, feed per tooth and axial depth of cut. The effects of precision milling were evaluated by analysing the scatter of dimension values obtained in successive tool passes. In addition to that, deviations from the assumed nominal depth as well as obtained ranges of dimension varation were analysed. The study also examined surface quality obtained in the precision milling process, based on the basic surface roughness parameters: Ra, Rz and RSm. Results have confirmed that the use of conventional cutting tools and a standard CNC machine tool makes it possible to manufacture components characterized by relatively small scatter of dimension values and high accuracy classes. Additionally, the results have shown that the type of tool coating and variations of individual technological parameters exert impact on the dimensional accuracy and surface quality obtained.

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