17th
radius choice
The restriction of minimum flection angle radius choice
Cold curved the flection modeling transform and is transformed by materialHong Kong PhD extreme limit to lead since the restriction of extreme limit extension rate.Otherwise will appear crack or break at curving place.The flection of the material transforms, the Cape department most outside layer metal fiber is pulled biggest in response to the dint, also accomplished for is broken a level most easily.But this variety that pulls in response to the dint enlarge with the letting up of flection curvature radius.Metal material allows of minimum flection radius Rmin theories calculation formula is:
In the type:R min-minimum allow flection radius of mm
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The thickness mm Hong Kong Business Administration in marketingof S- material
The δ s-metal material extreme limit extension leads
The extreme limit extension rate of in common use structure steel is given examples as follows:
10# steelsδ S=31%
20# steelsδ S=25%
The 16 Mn steel δ s=21%
Becomes in the enactment circle square craft can in order to ascend formula, is the basis that chooses that the square Ju tubePolytechnic management and marketing cuts the noodles Cape department flection radius.At cold bend profession in, international go to square Ju tubes in all countries of standard, not only carried on stipulation to the material composition machine function etc. condition, but also also press the material of taking care of the material,Hong Kong ba marketing wall thick give certainly the restriction of the curved Cape outside arc radius.
Use by our country structure cold curved hollow type steel country mark GB|T6728-2002 in of designate as an example:
The arc radius R outside the Cape department is worth
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