ON THE STUDY OF TIME PIECE SPRING (III)
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概要
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Referring to the time piece spring it may be classified in two according to its size: watch and clock. In general the former is about 0.95-1.2 per cent carbon and has the sorbite structure having a few spheroidal cementite. On the 3rd report the anthers examined what effect the size of the spheroidal cementite will give to the mechanical properties of the main spring.(1) At the B heat-treatment, when the cementite size is below 2.8, the Fatigue Breaking Number, the Torque Test Value, the Proportional Limit and the Young Modulus are at the max. value while the Permanent Strain and the Damping Capacity are at the min. value.(2) At the D heat-treatment, namely below about 4.1 of the cementite the mechanical properties become worse abruptly and above this size they become the worst.(3) At the A heat-treatment, namely the spheroidal cementite being absorbed in the austenite.The mechanical properties are inferior to the B heat-treatment.
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