Blank diameter for a torispherical dish?

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Discussion Overview

The discussion revolves around calculating the blank diameter required for a torispherical dish, focusing on the necessary formulas and methods for determining this measurement. The context includes technical reasoning and practical applications in manufacturing processes.

Discussion Character

  • Technical explanation
  • Mathematical reasoning
  • Experimental/applied

Main Points Raised

  • One participant requests formulas for calculating the blank diameter given an outer diameter of 1332 mm and a thickness of 6 mm.
  • Another participant suggests using algebra while assuming constant plate thickness and volume conservation.
  • A later reply confirms the assumptions of constant thickness and volume conservation.
  • One participant recommends searching online for 'torispherical dish calculations' as a potential resource.
  • Another participant describes a method of taking a diametral section through the dish and 'unrolling' it to a flat shape, suggesting that this method would yield a safe minimum diameter for the blank.
  • A question is posed regarding the method of shaping the flat circle into a torispherical dish, asking whether it will be done by pressing, metal spinning, or another process.

Areas of Agreement / Disagreement

Participants express various methods and assumptions regarding the calculation of the blank diameter, but there is no consensus on a specific formula or approach. Multiple competing views remain regarding the best method to achieve the desired outcome.

Contextual Notes

Some limitations include the dependence on assumptions about thickness and volume, as well as the potential variability in manufacturing processes that may affect the final dimensions.

lingesh
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Hi,
How can i calculate the blank dia required for a torispherical dish?Please share any formulas if you have..

OD=1332 MM
THICKNESS 6MM
 
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Using a lot of algebra. Have you tried assuming the plate thickness is constant and that volume is conserved?
 
stedwards said:
Using a lot of algebra. Have you tried assuming the plate thickness is constant and that volume is conserved?
yes, thickness is constant and volume is conserved..
 
Google ' torispherical dish calculations '
 
It's not actually all that difficult .

Take a diametral section through the dish and 'unroll' it back to flat .

If dish is made by any normal process which preserves constant and original thickness then diameter of blank as derived above will be on safe side of minimum needed .

In production or for one off's that were critical a manufacturer would either do a test piece or use experience of many previous jobs and trim basic blank diameter to get a little nearer to exact size needed .
 
lingesh.
Will you shape the flat circle into a torispherical dish by pressing, by metal spinning or by some other process?
 

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