ASME B18.18:2011 pdf free download

ASME B18.18:2011 pdf free download.Quality Assurance for Fasteners.
Statistical process control and other variation lowering nrasuri’s can significantly reduce the number of dclixts in the population that may be produced. but it should be noted that statistical indices only imply the quality level produced, and improperly applied statist,cal treatments will imply the presence of defects that are not present, or miss some deficiencies altogether.
The closest that one can approach zero defects in a population is through 100% part per part esamination. but again caution must be exercised. The goal ci zero here can be intractable. The complexity of resources required, the limitations of the available equipment for each verified characteristic, the stringency of controls required will only be able to deiminstrate qu.ilitv on a parts pee milhcsn (PPM) basis, and not necessarily any assurance of zero deficiencies,
2.2 In-Process Inspection
2.2.1 Fabricatinl Op.rations General inspection procedures shall be e-stabhshrd on the basis of mgi. nrenng and manufacturing eLps-nt.nce with regard to the effort of setup. tooling, operator, machine setup. and ops-raticin on each characteristic at each processing station. The minimum in-process requirements at each machine tw processing station shall be as follows:
(a) Five pieces shall be visually examined for gross defects and surface discontinuitirs as required by the applicable standards, Three pieces shall be verified for pact cKirac’trrgstics imparted to It Lw that machine or processing statlc’. in accordance with Table I at the following times:
(3) at the start of each prodUction rim
(2) at the start of each new shaft
(3) when a tool Ia changed LW whim an adjustment in machine setup is made
(4 at the completion of each manufacturing operation
NOTE: When tunpirn ca,tsde dies aim med. it is oily necessary in rii1v a stnJe piece for formed dlmensswcs
(b) During the production run, tin a frequency of not less than sine part per every 2 hr. parts shall be inspected for all designated part characteristics imparted to it by that machine or processing station in accordance with Tablet.
2.2.2 Heat Treatment, All heat treating processes and heat treatment equipment shall be regularly mcmitored to ensure process control and proper functioning of equipment.