The relationship and challenges between the development of the Japanese spring industry and the automotive industry.
[Reproduction Private Spring Preparatory School Lecture 12] The hardness of each railway plate spring is measured! Brinell hardness testing machines are installed simultaneously in all factories.
The research institute acquired the Rockwell and Vickers hardness testing machines in Showa year 3 and year 10, respectively. Since they were purchased ten years after the invention of the testing machines, it cannot be said that their acquisition was particularly early. It is likely that both testing machines also made their way into the Japanese spring manufacturing industry around this time. Research on the domestic production of piano wire was promoted around Showa year 13, and machines like Vickers greatly contributed to this research. Currently, the National Railways measures the hardness of each leaf spring individually, but this practice began in Showa year 27, which is why Brinell hardness testing machines were installed simultaneously in all National Railways factories that year. *For detailed content of the article, please refer to the PDF. For more information, feel free to contact us.
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