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2 Journal of Achievements in Materials and Manufacturing Engineering

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Lateral extrusion of a cross fitting with a lost core

Ohashi T., Ito H., Shinozaki K., Ito S., Watari H.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 24, nr 1

413-420

Purpose: Lateral extrusion process with a lost core for cross fittings is suggested. At first, cavity of tube is filled up by low temperature melting alloy. Then low temperature melting material is solidified to be the "lost core". The third, the material is extruded for lateral direction to be a cross-fittings. After deformation, low temperature melting alloy is melted and removed. The authors discuss its deform mechanism in this paper. Design/methodology/approach: Experiments and numerical analysis with ANSYS9.0. Findings: Extrusion defect is caused at the center of the cross on the inner wall of the pipe because of volume constancy when the branch diameter close to the initial pipe diameter. In such the case, contact between pipe and die surface is unstable and the branch part is not stretched enough, then it causes wrinkles. In such the case, it is better to provide more pressure against the head of branch projection. Research limitations/implications: The effect of the relationship amongst mechanical properties of the pipe and lost core is to be examined in future. We must seek better material for the lost core that is cheaper, easier to remove, clean and safer for the man and environment. Practical implications: This methodology is suitable for production of the hollow products having constant sections for lateral direction. Originality/value: The above result helps the economical production of hollow products with simple equipments.

Analytical and experimental study on lateral extrusion of cross fittings with a lost core

Ohashi T., Ito H., Shinozaki K., Ito S., Watari H.

Journal of Achievements in Materials and Manufacturing Engineering

2006

Vol. 18, nr 1-2

399--402

Purpose: The authors discuss deform mechanism of lateral extrusion process with a lost core for cross fittings. Outline of the is as follows: At first, cavity of pipe, or channel material, is filled up by liquid of low temperaturę melting material, for instances, low temperature melting alloy, ice (or water) and wax. Then low temperature melting material is solidified to be a soluble core of pipe. Authors call this soluble core the ‘lost core [1-4].’ The third, the material is compressed longitudinally as a composite billet, and extruded for lateral direction. After deformation, low temperature melting material is melted and removed. The authors think the process is suitable for production of cross-fittings because such the product has constant sections for lateral direction. Design/methodology/approach: The authors have examined the process with experiments [1] and numerical analysis with ANSYS9.0. Findings: The feature of the process is revealed. Extrusion defect is caused at the center of the cross on the inner wall of the pipe because of volume constancy when the branch diameter close to the initial pipe diameter. In such the case, contact between pipe and die surface is unstable and the branch part is not stretched enough, then it causes wrinkles. In such the case, it is better to provide more pressure against the head of branch projection. Research limitations/implications: In future work, the effect of the relationship amongst mechanical properties of the pipe and lost core is to be examined. In addition, the authors will seek better material for the lost core that is cheaper, easier to remove, clean and safer for the man and environment. Practical implications: Throughout the above research, authors conclude the suggested process is useful for making cross fittings, and the process can be useful on the other hollow products. Originality/value: The above result helps design of the economical process for fittings. The process requires only simple equipments.