XD Means toispherical heads which heads specification as follow
crown radius is less than diameter and knuckle area is more than 10%*diameter
there are two ways to form head plate by cold work, cold press and cold spinning
Head Plate by cold work is for standardization and mass production, it can be formed with inner diameter from 200mm to 3200mm(50mm pitch up to 2000mm, and 100mm pitch for above 2000mm), and with plates thickness of up to 28mm using the 6000ton that Hokkai developed. we called them Hokkai standard Dished End.
Cold Spinning forming is for non standard larger Dished Head by cold work production, this forming way can be achieved with inner diameter from 750mm-9000mm, and with plates thickness up to 45mm .we called Hokkai standard dished end
Our company are ASME U&U2 stamp holder and can provide dished head by cold work as PED/NB/GB/ASME standard
The below process are our normal way to form head plate by cold work. We can quote and form Hokkai standard dished end after you gave us the details as the below process.
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