When forming shaped springs, flat shaped springs, spring clips, contact springs and leaf springs, the rolling direction of the spring steel sheet and spring strip steel is an important factor, among other things. This is because the stretching of the material during rolling results in a fibrous material structure whose fiber elongation always occurs in the direction of rolling.
If the spring steel sheet is now bent along this fibre elongation or rolling direction, a larger minimum bending radius must be selected due to the higher risk of breakage. However, if the spring steel sheet is bent transversely to the fibre elongation, the minimum bending radius can be made smaller. This improved property of the spring steel strip or spring steel sheet can improve the yield strength or yield point by up to 15% for shaped springs, flat springs and metal components bent at right angles to the rolling direction.
The improvement in yield strength , or yield point, for metal formed parts bent transversely to the rolling direction is, for example, between 4 and 10% for spring steel 1.4310 with low strength (left graph) and up to 15% for high strength (right graph). This significant difference in the mechanical characteristics must be taken into account when designing shaped springs that are bent longitudinally or transversely to the rolling direction.
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The correct pressing force during forming
In addition to the rolling direction, the pressing force plays an important role in the forming of shaped springs, flat shaped springs and metal formed parts. In order to permanently transform the spring steel, the value of the yield strength (Rp) must be exceeded. If this is not the case, the metal returns to its original state. Only a load above the yield point (Rp), or yield strength (Rp0.2) causes plastic deformation. It is essential to ensure that the tensile strength of the spring material (Rm) is not exceeded, otherwise the material could be damaged.
Our technicians will be happy to determine which forming parameters are optimal for your shaped spring, flat shaped spring, contact spring, spring clip, leaf spring and spring washer. To do this, simply send us the required spring data with details of the number of pieces and the drawing or CAD data using our enquiry form for shaped springs.
Gutekunst Formfedern will be pleased to check the forming parameters and provide you with a non-binding offer at short notice. In addition to the enquiry form, you can also contact our technical department directly at info@gutekunst-formfedern.de and telephone (+49) 07445 85160.
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Benefit from the new Formfedern store
The new form spring store from Gutekunst Formfedern offers several advantages in the procurement of form springs, flat springs, laser parts and sheet metal parts. Thanks to its simple operation, transparent online price calculation and fast digital processing, it is a real support for designers, technicians and purchasers. At last, it is possible to configure, calculate prices, make inquiries and place orders for tailor-made formed metal parts in an uncomplicated and time-saving manner – around the clock and with maximum transparency.
Try it out for yourself at https://shop.formfedern.com
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