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For many years now, the stamping of parts from sheet or coil metals has seen an increase in technology.
Parts are no longer simply stamped and transferred to another station for a secondary operation. Nowadays, the parts coming out of the press have to be finished, or almost finished. More and more operations are carried out in the press: insertion of fasteners, positioning points such as nuts, studs, ball joints, centering pins, spacers...etc.
WHAT IS THE FASTENER INSERTION/CRIMPING PROCESS?
Crimping consists of attaching a component to a pressed metal part during the stamping operation. When carried out in the stamping press, it eliminates the need for a secondary operation to install the component. Costs are lower than for reworked welded or crimped components.
Depending on the component to be crimped, there are different processes.
Discover 4 methods below!
1 — Crimping by material deformation:
For this type of crimping, the component is seated by deforming the strip at the bottom dead center, thus avoiding any deformation of the component. For this technology, the fastener has specific shapes (edges or knurls) which, during crimping, cause the material to flow around the edges or knurls. In this way, the component is securely fixed and locked to the part. Crimping is performed in 1 operation.
2 — Crimping by component deformation:
This time, the fastener itself is deformed as it is installed on the part. The press deforms a specific area of the component to be inserted.
In this way, the component is fixed to the part. A calibration station is required after the insertion stage (to be designed by the toolmaker) to achieve the required specifications and protect the insertion head from overload. Crimping is performed in 2 or 3 operations.
3 — Crimping by force:
The fastener is crimped by being forced directly into the strip.
Knurling on the component ensures that the crimp is mechanically secure.
Crimping is performed in 1 operation.
4 — Self-piercing component
The final technology is called "self-piercing". There is no piercing operation at the component location.
This time, the fastener is crimped by deforming the strip at the bottom dead center, without deforming the nut.
A special die is required for this operation. Crimping is performed in a single operation. Waste disposal is also required.
Do you need to fix a component to a part produced in a press?
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