ASME B18.18.7M:1998 pdf download Qality Asurance Plan for Fasteners Produced in a Customer Approved Control Plan
1.1 Scope
This plan is based on the concept that a writtencontrol plan outlining the fastener manufacturing processand identification of its control points will provide anorderly procedure for controlling and minimizing process and product variation. Factors usually consideredwhen developing a control plan include past history,machine capacity and capability, new or special cus-tomer requirement(s)，and a PFMEA (potential failuremode and effects analysis). Typically the control planidentifies actions at each phase of the manufacturingprocess including receiving,in-process manufacturing.and out-going operations. Continuing versus periodicrequirements are identified and strategies are providedfor continued updating and improvement.
1.2 Written Agreement
The control plan shall define the respective controlelements including the characteristics and/or processparameters to be verified and frequency of verificationand shall be agreed to in writing between manufacturerand purchaser.
1.3 Process Control Plan
Variations in control strategies and process chartinglcontrols are common, based on methods used andvariables monitored. Variations are based on givenmachinery, plant layout, sensing devices, plant andproduct mix. An actual plan may have significantvariations depending upon manufacturer and purchaseragreement. A basic plan outline is shown in Fig. l.
1.4 Part Qualification
Part qualification is a preproduction assessment ofparts for their suitability in intended applications. Thepurchaser assessment varies depending upon part usageand previous product history. Engineering tests of part and joint function are typically completed with appropriate test record maintenance.
1.5 Lot Controls
1.5.1 Raw material shall be supplied to the manufacturer traceable to a mill heat of material.
1.5.2 Subcontracted processes including plating andheat treating shall be controlled to avoid product lotcontamination.
1.5.3 Finished lots shall be traceable to raw materialsupplier and subcontracted processes.
1.6 Plan of Inspection
The manufacturer shall have a document to indicateall points within the manufacturing process where fas-tener sampling and inspection is carried out includingfrequency and sample sizes.
1.7 Records of Inspection/Compliance
Records of inspection/compliance shall include writ-ten records of evaluation of preproduction parts. Allother records will also include those of in-processcontrols. Evidence of these records and the writtencontrol plan agreement shall be deemed compliance tothis Standard. Records shall be retained for a minimumof 5 years.
1.8 Control Plan Audit
The control plan shall include a provision for anaudit program, including frequency, to verify continuingconformance to the approved written control plan.
1.9 Process Revision or Change
No significant changes which impact the finishedproduct may be made in the process without writtencustomer approval.
2 REFERENCED STANDARDS
QS 9000, Quality System Requirements
Publisher: Automotive Industry Action Group, Department 77839, P.O. Box 77000, Detroit, MI 48277