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Abstract
Throughout the automobile industry development in hundred years, the requirements of
the vehicle from the practicality, reliability is improved to comfort, appearance, safety,
practicality economy and other aspects of the request, and on the vehicle body also puts
forward many new requirements, especially outside the hub parts surface quality. The
international automobile manufacturing industry between the increasingly competitive
incentives, vehicle development cycle shortens ceaselessly, ceaseless emerge in large
numbers of new type, flexible and reconfigurable body production line technology for the
manufacturing of small quantities of many varieties and the development of a new mode of
production, shorten the development cycle, is one of
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