The size of the draw die radius is one of the major factors affecting metal to draw properly. If the radius is too large, wrinkles will occur on the part. If the radius is too small, it will restrict the flow of the material and cause cracking to the part. As a general rule, three (...
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Coining is a common process in metal stamping industry. It involves thinning the material thickness and transforms the piece part to completely new shape and size. Coining can be done by cold and hot process; it requires higher operational force and may need to be performed two to three times in order to form...
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Some readers wrote to me asking what is the best, recommended bend radius for cold rolled steel after reading my previous post, entitled “Good way bend and the bad way bend” while some engineering students from India asked for formulas for tooling design. P.S: It is highly recommended that, readers put their questions and...
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Some readers wrote to me after reading my previous post on “Metal forming spring back”. The technique I mentioned in the post was used on a progressive tool it is not suitable in the single forming tool. Some of the factors for successful bending are the size of interior bend radius and the metal...
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A friend from Australia wrote to me asking for assistance on one of his project. He had a tool, which used a pressure pad to flatten a Ø1″ tube followed by punching a ¼” square hole on it. The tool used the punched slug from the top thickness as the punch for the bottom...
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