Issue of selecting measurement points for the actual thickness of convex end caps
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How should points be selected when measuring the wall thickness of convex end caps, and how can it be ensured that the measured wall thickness at every location is not less than the minimum forming thickness?
It is specified in Clause 6.3.13 of GB/T25198-2010. Article 6.5 of JB/T4746-2002 specifies the inspection location.
How can we ensure that the actual thickness in each area is not less than the minimum forming thickness? Are you trying to cheat?
Thickness measurement is a check of the thickness of the head; it can be understood as requiring that the thickness at any point on the head not be less than the minimum forming thickness. The measurement points for elliptical end caps are specified in the relevant standards; there are 7 points per longitudinal section, and theoretically the minimum thickness is located at the corner R
If you are from the inspection department, you can conduct tests in accordance with the standards for end caps; if you are from the user unit or supervision team, it’s fine to simply select a few samples for testing
If the arc transition area meets the requirements, there are basically no issues
Since the minimum thickness is to be measured, it should be at the point where the shape changes the most.
In accordance with the requirements of the head standards and design standards!
Different processing methods and different forming temperatures result in variations in the location of thinning; the standards take these differences into full account, so testing at the designated inspection points will not pose any problems.