# Technologie Kierspe

In the manufacturing plant Kierspe workpieces are realized by cold forging and manufactured to the highest quality and accuracy. The production focus is in the production of metallic Massenkaltform- / extrusion parts with wire diameters of about 2.9 mm to 16 mm.

In addition, in the mech. Extensive processing resources in use for further cutting and machining operations on the Massenkaltform- / extruded parts to make that can not be realized by the production on presses.

In metal forming cold forming is realized by means of compression molding in which the part to be produced is not heated, but in the cold state in between presses pressing punch and a die is deformed by enormous pressures. By the corresponding shapes of dies and punches, the material is forced to the open spaces that are defined by the die and punch to flow. This also diameter increments (reductions or full forward flow pressures) can be realized.
If the workpiece is reduced, the workpiece is automatically extended in a reduced diameter. Is between Matrizeninnenseite and stamp a space in which the material flows during pressing, constructed, a corresponding cavity is formed in the part. This process is known as cupping, where a "hole" formed by the penetration of the punch in the starting workpiece itself. Depending on the direction of flow of the material during the pressing is spoken by the forward or backward extrusion.

Cold forming or machining?

For the production of mass-produced articles such as screws, bushings, axles, bolts, and step molding parts, the use of cold forging is particularly suitable. Compared to metal cutting, the material used is almost completely converted into products. In order to win by increasing material weight and price in addition to much faster clock period achievable material savings compared to metal cutting in importance.
deferred compensation can be avoided by an optimally tuned Press consequence insofar as that by the resulting strain hardening (at specific sites) not to last through the homogenous material and by the favorable grain orientation in cold extrusion, high values ​​for tensile, bending - can be achieved and torsion-stressed parts.
Other advantages of cold extrusion are a smooth surface with a roughness similar to a ground surface and good dimensional accuracy.

Reducing the cost of high achievable production quantity per minute is additionally compared to production in a rotating part.

Because of these reasons, the method of cold forming is now paid attention more and more frequently during the design. The cost advantage over machining production is especially interesting for large series for our customers. The opposite of cutting production considerable Werkzeugentwicklungs- and tooling costs can be amortized over the savings potential of better material usage and the higher production numbers per minute after a short time.