ASME B18.18 pdf free download

ASME B18.18 pdf free download Quality Assurance for Fasteners
2.2 In-Process Inspection
2.2.1 Fabricating Operations.General inspectionprocedures shall be established on the basis of engi-neering and manufacturing experience with regard tothe effort of setup,tooling, operator,machine setup,and operation on each characteristic at each processingstation.The minimum in-process requirements at eachmachine or processing station shall be as follows:
a) Five pieces shall be visually examined for grossdefects and surface discontinuities as required by theapplicable standards.Three pieces shall be verified forpart characteristics imparted to it by that machine orprocessing station in accordance with Table 1 at thefollowing times:
(1) at the start of each production run(2) at the start of each new shift
(3) when a tool is changed or when an adjustmentin machine setup is made
(4) at the completion of each manufacturingoperation
NOTE:When tungsten carbide dies are used, it is only necessaryto verify a single piece for formed dimensions.
(b) During the production run, on a frequency of notless than one part per every 2 hr, parts shall be inspectedfor all designated part characteristics imparted to it bythat machine or processing station in accordance withTable 1.
2.2.2 Heat Treatment.All heat-treating processesand heat-treatment equipment shall be regularly moni-tored to ensure process control and proper functioningof equipment. Monitoring equipment shall be calibratedby an accredited organization or an organization author-ized by the original equipment manufacturer (seepara.1.3).
2.2.3 Finishing Operations.All plating, coating, andpost lubrication processes and equipment shall be regu-larly monitored to ensure process control and properfunctioning of equipment per applicable standards andspecifications.
NOTE: Records of in-process inspections are not required for anycategory. If process records are maintained for Category 3 products,the lower final inspection sample sizes shown in Table 2 may beused instead of the sample sizes indicated in Table 3.
2.3 Final Inspection
Every lot of fasteners shall be subjected to a finalinspection in accordance with the specified final inspec-tion category. The final inspection is intended to verifylot identification and to inspect designated characteris-tics for conformance to related standards, specifications,
and engineering drawings. Final inspection of any char-acteristic may be conducted at any point after whichthat characteristic will not be altered. Records of finalinspection shall be maintained in accordance withpara.2.6.
2.4 Acceptance and Rejection
2.4.1 Raw Material.All raw material (rod, wire,bar,or sheet) shall meet the applicable requirements.Nonconforming raw materials shall not be used for theproduction of fasteners and shall be quarantined untildisposition.
2.4.2 Manufactured Products.All parts shall con-form to the applicable requirements during in-processinspection at all fabricating, heat treatment, or finishingoperations. When nonconforming parts are found, allparts produced since the last inspection of the character-istic(s) found nonconforming shall be removed from fur-ther processing, quarantined, and held for disposition.2.5Disposition of Nonconforming Materials or Parts2.5.1 Supplier’s options.The supplier has thechoice of the following options in the disposition ofnonconforming materials or parts:
(a) They may be scrapped.
(b They may be 100% sorted and all nonconformingparts removed.
(c)They may be reworked or reprocessed to correctthe nonconforming characteristic(s).
d) They may be returned to the manufacturer if thesupplier is not the manufacturer.
e) A request for deviation may be made to the enduser.
If the end user considers that the degree to which thecharacteristic(s) deviates from specified requirementswill have no significant effect on the performance ofthe parts in their service application, the customer mayauthorize the deviation and release of the parts or mate-rials for completion of production or for shipment asapplicable.
NOTE:If the supplier is not the manufacturer, the supplier shallcome to an agreement with the manufacturer if option (a) or (c)is selected by the supplier.
2.5.2 Purchaser’s options.The purchaser shallcome to an agreement with the supplier on one of thefollowing options for the disposition of nonconforminglots or parts that have been found after receipt:
(a) They may be scrapped.
b They may be 100% sorted and all nonconformingparts removed.
(c) They may be reworked or reprocessed to correctthe nonconforming characteristic(s).