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Dimensional control of molded parts |
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|  MIL-E-48630(AR)
4.4.5 Dimensional control of molded parts. In place of normal
sampling and inspections associated with the Classification of
Defects and after a curing time for the parts has been approved (see
note 1), the contractor may, with the approval of the Government,
select a sample of three (3) parts (as molded) from each cavity to
be fully inspected dimensionally to qualify a new or reworked cavity
for use in production. The molded parts shall carry the individual
cavity identification. As a control of each cavity during
production, the above quantity of parts from each cavity shall be
inspected for at least the defects listed in pertinent paragraphs
4.4.2.1 through 4.4.2.28 after continuous production of each 5,000
parts or at the end of each week, whichever occurs first, Of the
three (3) samples, one (1) sample shall be the last part produced.
If any defective parts are found during qualification of the cavity,
the cavity producing the defective part will not be used in
production.
If any defective parts are found when inspection is
performed for the control of the cavity, the cavity producing the
defective part shall be removed from production. Further., that
portion of production since the last control check shall be returned
to the contractor for inspection for each separate type of defect
according to MIL-STD-105, using an AQL of 0.40 percent for each
major defect and an AQL of 0.65 percent for each minor defect. All
cavities removed from production because of some fault may, after
reworking, be returned to production providing they pass the
qualification test above. The contractor may request a change of
inspection frequency providing he presents objective evidence to the
Contracting Officer to substantiate the request. Contractor design
of gages and test equipment required to perform the inspections
listed herein shall be forwarded to Commander, ARDC, Dover, New
Jersey 07801, ATTN: AMSMC-QAT-M(D) for approval prior to
manufacture of equipment. The note subparagraphs identify this
paragraph.
NOTE 1: In establishing a curing time, dimensionally check ten (10)
parts from each cavity at periodic intervals (e.g. every 30, 60,
etc. mins.) until dimensional stability is attained. The curing
time will be from the time the part comes out of the mold until
dimensional stability is attained. The inspection data used in
determining the curing time shall be sent to ARDC, Dover, New Jersey
When a new cavity is substituted, an
07801, ATTN: AMSMC-QAT-M(D).
old cavity reworked, or the material or cycle time hanged, a new
curing time shall be established and approved (see 6.4).
NOTE 2: Those features of a part which are subsequently machined or
otherwise worked upon to meet its drawing requirements shall be
inspected in accordance with the classification of defects.
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