| 摘要 |
A method of forming blind holes in a sheet material is provided. The method includes forming a recessed segment in the sheet material, stamping the recessed segment between a tapered punch and a pad to form a blind hole having a sealed end and a sidewall, wherein the pad includes a profiling pin that is enclosed by the sealed end and the sidewall. The method further includes forming a material channel interposed between The tapered punch and a tapered die, and compressing the material channel to generate a material flow into the sidewall. The material channel may be narrowed to allow more material flow into the sidewall for additional sidewall thickness.
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