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FEM analysis of surface flaw of wire during drawing used in spring of automobile and medical instrument

100%

Yoshida K. , Shinohara T.

tom Vol. 72, nr 2

136-139

The high surface quality of drawn wire and rods have been required from the field of automobile, machine and medical test. Using three-dimensional FEA, this study analyzed wire breaks that occurred in the drawing fine wires containing inclusion and flaws on the wire surface. The growth and disappearance mechanisms of flaws such as transversal cracks and scratches on a wire surface during wire drawing were investigated.

Od drutów i prętów przeznaczonych do produkcji w przemyśle motoryzacyjnym i medycznym wymagana jest wysoka jakość powierzchni. W pracy przedstawiono trój-osiowy model odkształcenia ciała, analizowano pęknięcia występujące w cienkich drutach zawierających wtrącenia oraz wady powierzchni. Badano wzrost i mechanizm zanikania pęknięć poprzecznych i rys powstających na powierzchni drutu podczas procesu ciągnienia.

Ductility improvement of high carbon steel by alternate wire drawing method

100%

Nagashima H. , Yoshida K.

tom Vol. 70, nr 1

29--35

Purpose: High carbon steel wires have been widely used in industrial products such as bridge cables and steel cords for automotive tires due to their high mechanical strength and high fatigue characteristics. The wires are expected to have higher strength and smaller diameter in the future. Wire drawing is carried out to measure up to these requirements. However, after the processing, tensile strength increases, but ductility decreases due to the shear deformation on the wire surface. This research focuses on increasing the ductility for high carbon steel wires for production. Design/methodology/approach: As a process for obtaining wires with high strength, high ductility, and high fatigue strength, “alternate drawing” is proposed. Alternate drawing is a wire drawing process where the direction of the material flow is changed every few passes. Findings: And tensile test, torsion test, FEM analysis, and bending test were carried out to investigate the effect on alternate drawing on the ductility of the drawn wire. And then the results were compared with those of wires processed by conventional drawing. It is revealed that mechanical properties of wires processed by alternate drawing have been improved by the decrease of additional shear- strain accumulation on the wire surface portion. Research limitations/implications: This research is focused on the improvement of ductility, so in it the future we hope to achieve even lower drawing diameters and make finer wires. Practical implications: These fine high carbon steel wires could be used for making steel cord for vehicle tires, production of springs and production of steel ropes for industrial purposes. Originality/value: This paper is based on a previous research from Tokai University’s Yoshida Laboratory, but all the experiments and results were conducted by me.

A new method of mass measurement for checkweighers

61%

Fukuda K. , Yoshida K. , Kinugasa T. , Kamon M. , Kagawa Y. , Ono T.

2010

tom Vol. 17, nr 2

151-162

A checkweigher is an automatic machine to measure the weight of in-motion products. It is usually located around the end of the production process and ensures the weight of a product within specified limits. Any products are taken out of line if their weights are out of the specified limits. It is usually equipped with an optical device. It is used to make a trigger to set the time duration to allow a product to move completely on the weigh belt for sampling the weight. In this paper, a new method of mass measurement for checkweighers is proposed which uses just signal processing without the optical device. The effectiveness of the method is shown through experiments. Also a possibility of faster estimation of weight is shown.