• Title/Summary/Keyword: Precision Cold

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Experimental Study on the Magnetic and Mechanical Properites in a Cold Rolled Steel (냉간압연강판의 자기 및 기계적특성에 관한 실험적연구)

  • Kim, Chung-Kyun;Kim, Chong-Eok
    • Journal of the Korean Society for Precision Engineering
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    • v.6 no.4
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    • pp.103-107
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    • 1989

  • The effects of annealing temperature on the magnetic properties (maximum permeability, coercive force and remanence) and mechanical properties (hardness, tensile strength and elongation at rupture) were analyzed using the nondestructive impulsive magnetic analyzer in a medium carbon cold rolled steel sheet. This nondestructive method was very useful for the analysis of magnetic and mechanical properties of materials. As it was known in the literature, the three distinct processes that indicate the recovery, recrystallization, and grain growth of a metal were measured with the non-destructive analyzer.

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The Research on Precision Forging of Spur Gears

  • Chengyu Chengyu;ZangShunlai ZangShunlai;Guocheng Guocheng;Ligang Ligang;XingGuanghan XingGuanghan
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2003.10b
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    • pp.67-72
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    • 2003

  • The cold precision forging of spur gears has been researched, and the effects of relief-hole shape and forging process on the spur gears forming has been analyzed. The results present that the forging load decreases when a suitability diameter of relief-hole is chosen, but the function is not obvious. The spur gears precision forging method with an adjustable movement of concave mould can benefit both the top and the bottom comers forming of the spur gears, full fill the tooth cavity, and decrease the forging load.

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A Study on the Design of the Prestressed Precision Cold Forging Die (예압된 정밀 냉간단조 금형설계에 관한 연구)

  • Yeo, H. T.;Choi, Y.;Hur, K. D.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.11a
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    • pp.377-380
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    • 2000

  • The dimensional accuracy of the cold forged part is depended on the elastic characteristics of the die. To obtain the high stiffness of the prestressed die, the first stress ring of the tungsten carbide material is considered. For the design, Lam 's equation is used. The design of the prestressed die has been compared with the conventional that. For the comparison, the FE-analysis using ANSYS has been performed. The results indicate that the prestressed die with the high stiffness can be obtained by the using the high stiffness material as the first stress ring.

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