If only the nominal thickness is indicated on the drawings, how can the actual minimum thickness of the head be determined?
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If only the nominal thickness is indicated on the drawing, how can the actual minimum thickness of the head be determined? Please ask a Haiyou for help.
Since only the nominal thickness is indicated on the drawings, the minimum thickness of the head after forming shall be not less than the nominal thickness minus the negative steel deviation.
Is there something wrong with the way the original poster phrased it? ? ““The actual minimum thickness of the head” is measured by the inspection department after the head returns to the factory, and recorded on the inspection form. I think what the original poster means is the minimum wall thickness of the head; this can be indicated in the notes section of the drawings as “minimum thickness”, or it can be specified below the thickness value for the head.
If the minimum thickness of the head after forming is not specified on the drawing, then the minimum thickness after forming = nominal thickness – negative deviation of the steel material – amount of thinning due to head forming
External Image Supply； If only the nominal thickness is specified in the drawings, the actual minimum thickness of the head shall be determined as the minimum thickness of the head after it has been formed, and this value must be not less than the nominal thickness.
The diagram shows only the nominal thickness; the minimum thickness after head forming is not less than the design thickness, that is, the nominal thickness minus the negative deviation of the steel.
It is possible to check the dimensional inspection report included in the container’s factory certificate, but it is better to indicate on the drawings the minimum thickness of the head after it has been formed. This gives a more accurate representation of the actual conditions, as there may be thinning of the head or substitution of materials in terms of thickness; we have already requested the manufacturing plant to do this
Not less than the nominal thickness minus the secondary deviation
The last edit to this post was made by fjfg on 2009-12-14 at 09:17. That can’t be right; it should be: Minimum actual thickness of the head > Minimum required thickness after molding = Nominal thickness – Negative deviation of the steel material. The nominal thickness specified in the drawings does not take into account the thinning that occurs due to the molding process of the head
If only the nominal thickness of the head is indicated in the diagram； Therefore, when selecting the head material, it is necessary to take into account the negative deviation of the steel plate in addition to the nominal thickness, and then add the reduction in thickness resulting from head forming. Under normal circumstances ； The design drawings should indicate the nominal thickness before specifying the minimum thickness of the head.
Minimum thickness after forming = Nominal thickness – Negative steel deviation – Thinning amount due to forming of the head (in our factory, we usually assume a thinning of 0.1 times the nominal thickness). By the way, what is the difference with those on the 3rd floor? Please give me some advice