【Discussion Thread 16】Compared to elliptical end caps, which type results in greater thinning during shaping for spherical end caps?
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This post was last edited by kareale88 on 2019-2-23 at 13:24 with bg4.png【Discussion Thread 16】Compared to elliptical heads, which type of spherical head results in greater thinning during shaping? For two types of end caps with the same diameter: compared to elliptical end caps, which one results in a greater amount of thinning during shaping for spherical end caps? Considering overall pressing and pressing after layout first, is the effect the same in both cases? Haiyou@zjq1962 suggested that since the depth of a spherical head is greater than that of an elliptical head, the amount of thinning during shaping is naturally larger. The minor thinning during the forming of hemispherical heads refers to the case of segmented pressing; if formed as a single piece, the degree of thinning is greater than that of elliptical heads. Do everyone agree, or are there any other opinions?
The ball is large; the effect of hot-pressing the ball-shaped head is more noticeable
Why is the forming thinning rate for spherical heads not specified in the head standards? Do you calculate it based on a certain percentage?
15% because of the spherical heads – there are huge differences among different manufacturers, making it impossible to establish a unified standard
Overall compression definitely results in a large thinning of the spherical head
The figure is taken from clause 4.2.4 of JB/T1609 – Technical Requirements for the Manufacturing of Boiler Drum.
:Handshake is awesome; this one has it too. For that elliptical and spherical head, what is the thinning trend from the end to the vertex, that is, how does it change?
Manufacturing spherical heads is also quite difficult and costly. Generally, an oval shape is sufficient for containers.
The thinning of elliptical end caps occurs mainly in the transition zone with small r, while the thinning of spherical end caps is more uniform.
Yes, it’s probably because of the greater depth; the area outside the elliptical transition zone is also spherical. The spherical head is hemispherical in shape, but the degree of thinning varies significantly. When making holes in a general cover, what is the maximum allowable distance from the center of the hole? It’s suddenly not clear anymore
With overall compression, the thickness reduction of the spherical head will definitely be significant