Spring, though seemingly insignificant, but it plays the role of is dangerous. National industrial manufacturing, to speed up the development of automobile industry, as one of the components, parts, springs and requiring more rapid development, so as to meet the rapid development of the whole industrial country. With the enlargement of the spring scale of product varieties, the constant improvement of the quality level has become the needs of the mechanical equipment upgrading and supporting the need to improve the performance of the host, therefore, for the country to vigorously develop, spring has played a vital role.
Although our country's automobile, tractors, motorcycles, internal combustion engines, light and the continuous development of electric industry, spring varieties are also gradually increased, ever increasing Numbers. Demand for more

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