Extended length
The stretched length , developed length or length of the development is the original length of curved workpieces . It must be calculated in order to determine the length of the starting parts before bending . In the calculation, a distinction is made between stretched parts with large bending radii and stretched parts with small bending radii.
The stretched length is made up of the partial lengths of the bent part. Since the neutral fiber lies in the middle of the rod with good approximation for large radii, i.e. it is neither compressed nor stretched, you can simply divide the rod into sections of equal radii and add the lengths of these sections.
In the case of bent parts with small radii, the neutral fiber is no longer in the center of the rod. A correction factor must therefore be used here. First of all, as with bent parts with large radii, the part lengths are added. The correction factor is then deducted from this sum. This factor is the product of the number of bending points and a constant v, which depends on the sheet thickness of the bent parts and the radius.
swell
- Expertise in metal, 55th edition, page 98
See also
Web links
- Extended Length (accessed December 13, 2019)
- Calculation of stretched lengths (accessed on December 13, 2019)
- Circumference and stretched lengths (accessed December 13, 2019)
- Forming table (accessed December 13, 2019)
Individual evidence
- ↑ DIN 406-10: 1992-12, technical drawings; Dimensioning drawings; Terms, general basics . Beuth Verlag GmbH, doi : 10.31030 / 2475149 ( beuth.de [accessed on June 6, 2020]).
- ↑ DIN EN ISO 129-1: 2020-02, Technical Product Documentation (TPD) - Specification of dimensions and tolerances - Part 1: Basics (ISO 129-1: 2018); German version EN ISO 129-1: 2019 . Beuth Verlag GmbH, 3.2.3 Developed length, doi : 10.31030 / 3111256 .
- ↑ GDR standard: TGL 31046 / 02-1983 measurement entry basic rules . Berlin, 3.11. Processing ( uni-weimar.de [PDF]).