What is the thinning rate for EHB219X6 head forming?
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As the title suggests, the minimum diameter specified in the GB/T25198 standard is 300. Could someone tell me what the thickness reduction rate for forming EHB219X6 headings is? Thank you! :)
It is usually taken in this way: for <DN300, it is roughly determined based on DN300.
Thank you so much! If it doesn’t bother you, could you share your Excel file? Hehe
No problem, I’ll send it to you tomorrow; I’m not at the computer right now.
bk15.jpg is for reference only and falls outside the standard range; it is advisable to consult the head manufacturer for specific details.
The thinning amount during head forming is related to the technical capabilities of the party responsible for manufacturing the heads; you can contact your company’s subcontractors for this purpose. If specific data are not available, the recommended values in the GB/T25198 head standard can be referred to.
As mentioned on the 2nd floor, it’s mainly because this isn’t specified in the standards for cover plates of type 219; currently, the 300 series is being used
219 can refer to those with a similar diameter
The manufacturing processes are now very mature, with thinner thicknesses and tighter manufacturing tolerances; the specific values vary depending on the capabilities of each manufacturing unit. Since 2008, for the cold-forming processes I’ve been involved with, the thickness reduction has never exceeded 10%. Therefore, the best approach is to consult the head manufacturing factory directly :)