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Due to the advantages of equal curvature in each position, the performance of the constant force spring is excellent. However, the geometry constraint of constant force spring during stabilizing heat treatment results in the bias of an outer natural diameter longer than the inner in the current forming process, which affects the accuracy of the constant force spring. For solving the above problem, the tension-compression composite progressive bending process was proposed to form such component, and its forming principle was described. Furthermore, the forming process was analyzed, and the critical process parameters affecting forming were explored on the rules and values by experimental research. Therefore, the characteristics of low torque in compress bending and high stability in stretch bending were combined, and the residual stresses were reduced by bending forwards and backwards to make the constant force spring be applied directly without heat treatment with a high stability, higher mechanical output precision and the energy storage density, which makes more efficient and energy saving in production.
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