Collar pulling

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Example of a collar or sheet metal penetration

Collar pulling is a forming process in which collars are placed on sheet metal or pipes through tensile pressure. According to DIN 8580 , collar drawing is part of the tensile compression forming process.

When pulling collars, the part geometry that can be produced is limited by the process-dependent formability of the material. An extension of the process limits can be achieved by a complex, multi-stage forming process.

Collars are used for many different purposes. They serve, for example, as a thread passage for screw connections , the passage of cables , for fixation or as step protection (perforated sheet), as bearings for shafts in the sheet, to increase the bending stiffness of the sheet.

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