Newly appearing technical articles

ABSTRACTS OF LITERATURE


The articles listed below are from recent technical journals and may be of interest to members. Copies are available from Margaret O’Malley at IST Headquarters.


Verhoeve, P. and Vermeersch, V., NV Bekaert SA, Belgium "Improved coilability and corrosion resistance of critical spring applications with Bezinal® XC and Bezinal® XP coated wire”, euro wire - The International Magazine for the Wire & Cable Industries, September 2014, pp 72-74

Abstract

Bezinal® XC and Bezinal® XP are a new range of zinc aluminium coated wires that have been especially designed for critical spring applications.

While Bezinal® XP excels in corrosion and cathodic protection, Bezinal® XC maintains its coating integrity even under heavy deformation and high stress-relieving temperatures.

As these properties remain fully intact after processing, no post-coating is required. To guarantee the quality of their performance, both coatings have been subjected to several test runs and a wide variety of tests specifically relevant to spring manufacturing, salt spray, Kesternich, humidity, outdoor exposure, coiling tests, etc.

 

Bandini, M. "Peening - Almen Saturation Curve From A Statistical Perspective”, MFN - Metal Finishing News International, Vol. 15 September 2014, pp 18-20

As widely known in the shot peening field, Intensity is an indirect measurement of the kinetic energy of the shot stream. It is a common opinion that the most accurate method of estimating peening intensity is to produce and analyze a saturation curve. Modern technology also enables direct measurements of the shot stream velocity. As a matter of fact, direct measurements of the average speed of the shot stream can be made by special instruments, but when it is necessary to know the effect of the stream on the real shape of the part being peened, the most accurate way still remains the saturation curve.

 

Asakawa, M. "MORDICA LECTURE - Part 1: Trends in drawing technology for bars and wires”, WIRE JOURNAL INTERNATIONAL, August 2014, pp 60-66

This article, in two parts, reviews drawing processes used for drawing bar and wire and introduces a very flexible nonslip continuous method of wet drawing.

The processes and production of bars and wires are extremely important, especially for the manufacture of automobile parts, industrial equipment and electronic and electrical devices. Bars and wires are commonly used as safety components in engines, drivers, suspensions and life-saving features. Therefore, they must be manufactured with superior dimensional accuracy and mechanical and metallurgical properties. In this study, the autor's research group primarily focuses on processes related to drawing bars and wires. First, the fundamental drawing elements are discussed, such as the axial residual stress of drawing, the effect of the additional shear strain layer, the delamination of high-carbon steel wire and diameter thickening during drawing. Second, the applied drawing technologies are discussed, such as inline phosphate reaction soap treatment technology, ultra-smooth, extruded aluminium alloy bars using single-pass protrusion die drawing and magnetic scales made by drawing with transformation induced plasticity effect. Finally, a novel nonslip continuous wet drawing method is introduced for fine wires in which any pass schedule and back-tension conditions can freely be set.

 

Yoshida, K., Suga, K., Nakazima, K., Watanabe, K. and Umezu K. "TECHNICAL PAPERS - Processing technology of high dimensional accuracy shaped wire drawing for spring wire”, WIRE JOURNAL INTERNATIONAL, August 2014, pp 72-75

Research showed that shaped wires used for springs can be fabricated from circular wires by two-pass drawing that meets FEA predictions as well as the required cross- sectional shape.

Springs used in automobiles and machine tools need to be lightweight, high-strength and able to serve a long lifetime. Springs with a rectangular cross-section are preferable to those with a circular cross-section because they take up less space and have the capability of storing a greater amount of energy. Springs with a rectangular cross-section are manufactured as follows.

 


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