This document discusses various techniques for punching and forming sheet metal while avoiding curling. It presents solutions such as using a gripper line around the embossing to isolate the forming area, a relieved stripper and die, and ensuring the sheet border and areas near holes remain unaffected. Various techniques are shown that can pierce, emboss, and extrude the sheet metal in a single hit or through progressive multiple hits.

1. PUNCHING & FORMING
COMBINED
FOR YOUR INSPIRATION
1

2. Gripper line around emboss
avoids curling of the sheet
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Heavy sheet curling without gripper line …
AVOIDING SHEET CURLING

3. … with use of
relieved stripper and die
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Sheet curling can be minimized …
AVOIDING SHEET CURLING

4. Sheet border and near holes
remain unaffected
PowerMax
Die
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Example of Emboss upper
insert with Gripper Line
GRIPPER LINE SOLUTIONS

5. V-Line emboss (Gripper Line)
in the stripper isolates the
forming area.
Used in combination with
PowerMax Die
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GRIPPER LINE SOLUTIONS

6. 6
GRIPPER LINE SOLUTIONS

7. ‘Heel’ prevents side load
in off-center applications
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HEEL TOOL

8. 8
LANCE & FORM

9. 9
HIGH LANCE & FORM

10. 10
Pre-pierce and Emboss
in one single hit
PIERCE & EMBOSS

11. Triple pre-pierce
and extrusion down,
in one single hit
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TRIPLE PIERCE & EXTRUDE DOWN

12. Pre-pierce, extrusion and
emboss in one single hit
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PRE-PIERCE EXTRUSION & EMBOSS

13. Two or three progressive
hits required per part, but
every hit finishes a part.
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Two or three progressive hits required per
part, but every hit finishes a part.
PROGRESSIVE PUNCHING & FORMING

14. 14
Two or three progressive hits required per
part, but every hit finishes a part.
PROGRESSIVE PUNCHING & FORMING

15. 15
PROGRESSIVE PUNCHING & FORMING

16. Special precision tabs per customer design
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Etch: 09182900
SPECIAL SHEARBUTTON TAB

17. OUR MISSION:
To personally respect, support and inspire sheet metal professionals
around the world with high-quality precision tooling and services.