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Application knowledge of tensile parts

  The following from the process and design of die and adjust to discuss several aspects: how to prevent or solve the drawing parts covering ruffling problems, resulting in a lot of stretch ruffling reasons, but as long as the phenomenon of careful study and cut, different environment in different ways to solve, will cover out of good surface quality the.
In the first general drawing die pull test when drawing parts were wrinkled and cracked, then must be carefully observed would binder surface environment, analysis of various causes of ruffling. If the binder surface indentation, radius of die cracks, explain the difficult feeding; if the binder formed ripples, began to feed easily, because after the corrugated material flow occurred, difficult, resulting in wrinkling cracking, that is to say in the drawing process, the material flow of the difficulty, will lead to stretch the wrinkling and cracking, so different environments will use different methods to solve.
The feed is generally difficult because the binder feeding too much resistance to. If the binder surface and die fillet surface roughness value is too large, or anti forming, local tensile is too large, it is necessary to regulate the outer slide, reduce the BHF, increasing the die fillet, reduce the surface roughness value and increase tensile rib groove gap. If the local tensile deformation is too large and has a reverse forming, the process or process hole shall be adopted to solve the problem.
Easy to feed mainly because the binder feeding resistance is too small, the pressing surface contact is not good, or the design of the drawing process is poor and. If the problem requires the binder binder, to ensure full contact, in addition to adjust the outer slide increase of BHF or increase the pressure edge area. If the drawing process is poor, it is necessary to redesign the tensile component to pull out the qualified product.

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