A Tool Tilt Angle Calculation Method in 5-axis Flat-end Milling for Free Surface Machining
Gyong Wal Jang,
Nam Chol Yu,
Hyon Chol Hwang,
Guan Sik Jang,
Tae Jin Bang
Issue:
Volume 6, Issue 1, March 2021
Pages:
1-9
Received:
25 December 2020
Accepted:
18 January 2021
Published:
8 May 2021
Abstract: This paper proposes a method for calculating the tilt angle of the tool and the machining strip width when the tool is inclined to the feed direction. Tilt angle of the tool and machining strip width are important factors which affect feed rate and machining quality in five-axis flat-end milling for free surface. There are some methods to calculate the tilt angle of the tool in five-axis flat-end milling for free surface, but mathematically complicated algorithm is applied to the calculation of tilt angle of the tool, so it is difficult to apply it in practice. We considered the geometry of the surface and the tool as well as the scallop height to determine the tool tilt angle, thus ensuring the tool to be contacted with the surface at two points. This allows us to calculate the tool tilt angle and the machining strip width by solving quadric equations based on the contact circle. Moreover, tool tilt angle and machining strip width are calculated analytically. Thus the speed of calculation is quick and easy to implement. An experiment of machining on the biquantic B-spline surface was performed and the results show that the proposed method has considerably higher machining efficiency than the CMM.
Abstract: This paper proposes a method for calculating the tilt angle of the tool and the machining strip width when the tool is inclined to the feed direction. Tilt angle of the tool and machining strip width are important factors which affect feed rate and machining quality in five-axis flat-end milling for free surface. There are some methods to calculate...
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Performance Optimization of Super White Washed Stretch Denim Fabric by Deviating Washing Process Time and Machine RPM
Md. Zayedul Hasan,
Md. Tareque Rahaman,
Sumaiya Akter,
Arnob Dhar Pranta
Issue:
Volume 6, Issue 1, March 2021
Pages:
10-19
Received:
22 May 2021
Accepted:
3 June 2021
Published:
21 June 2021
Abstract: Over the last few decades, a lot of innovations and development works had already made denim “classic” in the fashion cycle. The modern consumers of today’s world are not only devoting themselves on clothing comfort but also emphasizing on economic and environmental sustainability. As a result, there has been increasing interests in terms of using environment friendly, non-toxic and biodegradable wet process such as super white wash. Though it enlarged higher consumer aspects and market opportunities in the denim washing technology, no research work had done yet regarding to super white wash. It can easily be applied to solid fabrics and finished garments. This research work was intended to analyze the physical and chemical changes of denim fabric while incorporating into super white wash at variable process parameters such as washing process time and machine rpm. Though its prime objective is to improve the whitening effect of textiles and apparels, it also can improve color strength (K/S), color fastness properties (color fastness to washing, color fastness to light, color fastness to perspiration), pilling resistance and fabric handle. In this article, it was demonstrated that all the fabric samples achieved gradual deterioration of tensile strength, tear strength and dimensional stability with the increase of washing process time and machine rpm up to a certain stage. Furthermore, the fabric samples showed better results regarding whitening index (WI), color strength (K/S), pilling resistance, fabric handle and color fastness properties with the gradual rise of washing process time and machine rpm. There were some notable changes in fabric GSM at the following washing conditions.
Abstract: Over the last few decades, a lot of innovations and development works had already made denim “classic” in the fashion cycle. The modern consumers of today’s world are not only devoting themselves on clothing comfort but also emphasizing on economic and environmental sustainability. As a result, there has been increasing interests in terms of using ...
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