ASME B18.18 pdf download Quality Assurance for Fasteners
2.2 In-Process Inspection
2.2.1 Fabricating Operations. General inspection procedures shall be established on the basis of engi- neering and manufacturing experience with regard to the effort of setup, tooling, operator, machine setup, and operation on each characteristic at each processing station. The minimum in-process requirements at each machine or processing station shall be as follows:
(a) Five pieces shall be visually examined for gross defects and surface discontinuities as required by the applicable standards. Three pieces shall be verified for part characteristics imparted to it by that machine or processing station in accordance with Table 1 at the following 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 adjustment in machine setup is made
(4) at the completion of each manufacturing operation NOTE: When tungsten carbide dies are used, it is only necessary to verify a single piece for formed dimensions.
(b) During the production run, on a frequency of not less than one 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 Table 1.
2.2.2 Heat Treatment. All heat-treating processes and heat-treatment equipment shall be regularly moni- tored to ensure process control and proper functioning of equipment. Monitoring equipment shall be calibrated by an accredited organizationor an organizationauthor- ized by the original equipment manufacturer (see para. 1.3).
2.2.3 FinishingOperations. Allplating, coating, and post lubrication processes and equipment shall be regu- larly monitored to ensure process control and proper functioning of equipment per applicable standards and specifications. NOTE: Records of in-process inspections are not required for any category. Ifprocess records are maintained forCategory3 products, the lower final inspection sample sizes shown in Table 2 may be used instead of the sample sizes indicated in Table 3.
2.3 Final Inspection Every lot of fasteners shall be subjected to a final inspection in accordance with the specified final inspec- tion category. The final inspection is intended to verify lot identification and to inspect designated characteris- tics for conformance to related standards, specifications, 2 and engineering drawings. Final inspection of any char- acteristic may be conducted at any point after which that characteristic will not be altered. Records of final inspection shall be maintained in accordance with para. 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 the production of fasteners and shall be quarantined until disposition. 2.4.2 Manufactured Products. All parts shall con- form to the applicable requirements during in-process inspection at all fabricating, heat treatment, or finishing operations. When nonconforming parts are found, all parts produced since the last inspection of the character- istic(s) found nonconforming shall be removed from fur- ther processing, quarantined, and held for disposition. 2.5 Disposition of Nonconforming Materials or Parts 2.5.1 Supplier’s Options. The supplier has the choice of the following options in the disposition of nonconforming materials or parts:
(a) They may be scrapped.
(b) They may be 100% sorted and all nonconforming parts removed.
(c) They may be reworked or reprocessed to correct the nonconforming characteristic(s).
(d) They may be returned to the manufacturer if the supplier is not the manufacturer.
(e) A request for deviation may be made to the end user. If the end user considers that the degree to which the characteristic(s) deviates from specified requirements will have no significant effect on the performance of the parts in their service application, the customer may authorize the deviation and release of the parts or mate- rials for completion of production or for shipment as applicable.