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TZM Alloy Bending Force Analysis

TZM alloy bending deformation process including bending forming and bending after unloading rebound. Bending force will directly affect molding equipment choice, besides it will reduces the loss of molding equipment to improve the service life of molding equipment. Thus, effectively reduce the bending force to improve the performance of TZM alloy has a certain impact. Some related research scholars study TZM alloy bending force’s influence factors, reducing bending force and improving TZM alloy performance. The influence factors include rough opening depth of blanks, punch fillet radius, punch radius, friction coefficient and other parameters.

During experiment, TZM alloy plate U-shaped curved corners bending force change rules are as following: at the beginning of bending, with punch down, bending force increases; after some time, there is a fluctuating trend phenomenon of bending force; arrival clamping, bending force showing a sharp rise.

Opening depth: with the opening depth increasing, the bending force maximum value of TZM alloys continue to reduce. If the opening depth is too shallow, there is wrinkling phenomenon at opening zone to hinder plastic flow, affecting the quality of molded alloy. But if opening depth is too deep also will influent alloy’s quality.
Punch radius: with punch radius increasing, bending force maximum value shows decreasing trend.
Punch fillet radius: With punch fillet radius increasing, bending force maximum value shows decreasing trend.
Friction coefficient: with the increase of the friction coefficient the bending force is increasing as well.

It was found that the opening depth, punch fillet radius and punch radius only affects the bending force’s maximum value, but friction coefficient impacts bending forces on the entire molding process. The most effective way to reduce TZM alloy bending force is reasonable choice punch fillet radius and punch radius.

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