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close this bookShearing - Course: Technique of working sheet metals, pipes and sections. Trainees' handbook of lessons (Institut für Berufliche Entwicklung, 17 p.)
View the document(introduction...)
View the documentPreliminary Remarks
View the documentHints on Labour Safety
View the document1. Purpose of Shearing
View the document2. Tools and Machines
View the document3. General Construction of Shears
View the document4. Mode of Operation of the Shearing Process
View the document5. Shearing Techniques
Open this folder and view contents6. Sequence of Selected Shearing Operations

5. Shearing Techniques

The different shearing techniques are distinguished by the kind of cutting.

Cutting-in

A cut is performed that is only partially penetrating the material. Thus, the material is not cut completely.

Cutting-in is mostly effected in preparing the subsequent bending-off procedure.


Figure 21. Cutting-in for subsequent bending

Cutting-off

A cut is performed, going through the material completely and thus separating the material. The cut-off and extremely bent material is scrap.


Figure 22. Cutting-off

1 workpiece, 2 waste

Cutting-out

The material is completely cut alongside a line closed in itself.

The material cut out is the workpiece, the rest is scrap.


Figure 23. Cutting-out

1 workpiece, 2 waste

Punching

The material is completely cut alongside a line closed in itself. The material cut out is scrap, the material surrounding is the workpiece.


Figure 24. Cutting-out

1 workpiece, 2 waste

Which stages are passed through in a shearing process?
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What is the difference between the techniques of cutting-out and punching?
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