ASME B18.18:2017 pdf download

ASME B18.18:2017 pdf download.Quality Assurance for Fasteners
1.1 Scope
This quality-focused Standard establishes in-process and final inspection requirements for fastener products as well as a receiving inspection plan for fastener pur- chasers. This Standard identifies four categories, recog- nizing that fastener users have widely varying requirements. The fourcategories covered are as follows: (a) Category 1 — a receiving inspection plan for purchasers (b) Categories 2 and 3 — utilizes documented and verifiable in-process controls structured at the produc- er’s discretion (c) Category 4 — includes all of the requirements of Category 2 plus 100% inspection for a specific feature or features In the preparation of this Standard, it was recognized that its function must enable it to be a part of the various regimens in use today that attain certain quality levels of products. This Standard was written to encompass frameworks that enable the users of this Standard to pinpoint which category they wish to use in meeting their own objectives.
1.3 Measuring and Testing Equipment
All inspection and testing equipment that is used for the acceptance of Categories 2, 3, and 4 fasteners shall be calibrated by a laboratory that has been accredited to ISO/IEC 17025 by an accreditation body that operates in accordance with ISO/IEC 17011. Calibration may also be conductedbyanorganizationauthorized bythe origi- nal equipment manufacturer. Calibration shall be trace- able to the National Institute of Standards and Technology (NIST) Standard or an equivalent national or international standard.
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.
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.