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TOP-HARDT: Hardness Testing

REV:03/28/08

SCOPE: This procedure covers the checking of product hardness (Brinell or Rockwell) both by heat treaters and in our own plant.

 

Section l - Hardness testing requirements for hardness testing made by authorized heat treater

STEP WHO WHEN INFO TO USE WHAT TO DO RESULTS
1 Authorized heat treat supplier Receipt of parts and Heat Treat Purchase Order Heat Treat Purchase Order After parts are heat treated perform hardness testing  according to instructions on Heat Treat Purchase Order; record results. Parts heat treated and hardness performed per instructions
2a Authorized heat treat supplier If parts cannot be brought within specification Heat Treat Purchase Order; own testing Contact  QA Manager for waiver; if achieve waiver, return parts with certifications noted as to waiver. Parts returned either in spec or with waiver documented
2b QA Manager Upon receiving call from heat treater seeking waiver Heat treater conversation; Process Plan in Jobs Info; customer specifications; possibly conversation with customer Evaluate heat treater's request for waiver; if waiver is within customer requirements (or if customer provides waiver), give heat treater written waiver (letter or telefax), place copy of waiver in Customer PO file and document waiver in Jobs info. Heat treater either granted or denied waiver; any waiver documented in Jobs info, Customer PO file; material certs; waiver to PO file
3a Shipping Leadman; Shipping Clerk Return of parts and paperwork Heat treater's certifications Review heat treater's certification and verify hardness information. Hardness verified
3b Shipping Leadman; Shipping Clerk A hardness problem Heat Treat Purchase Order, Heat Treat Certifications, Process Plan; Traveler Inform QA Manager of hardness problem. Hardness problem reported to QA Manager
3c Shipping Leadman; Shipping Clerk After heat treat results received Heat Treat Certifications Send heat treater's cert to QA Clerk. Heat treat results forwarded to QA Clerk
4 QA Clerk Heat Treat Certifications received Heat Treat Certifications Enter heat treat results in M2M; scan into Parts Certs Directory. Results entered in M2M; scanned into Parts Certs Directory
Section ll  Hardness verification procedures for in house hardness testing
1 Post Forge Leadman; QC Inspector All prior steps for job complete on Traveler; Post Forge Supervisor's instructions to do a random hardness test Traveler; MIL-STD-105D General Inspection Level I with an AQL of 1.0. Determine where to take test, what type to take* and sample size using MIL-STD-105D General Inspection Level I with an AQL of 1.0; initiate hardness testing and enter results in Powerway SPC. Random testing performed; hardness testing initiated; results entered in Powerway SPC
2 Post Forge Specialist, QC Inspector Data is entered in Powerway SPC Traveler, calibration sheet  from Post Forge Specialist Calibrate the tester to assure repeatability; fill out a Hardness Calibration Sheet; adjust tester to read within +/- tolerance allowed on test block; prepare samples with smooth and flat surface; after test is completed, store all test blocks, scopes, grinders, and any additional equipment; all calibration, preparation and testing is to be done per ASTM E-10 (Brinell) and ASTM E-18 (Rockwell). Forward calibration sheet to Post Forge Supervisor. Send any hardness results that have failed to QA Manager. Traveler, calibration sheet to Post Forge Supervisor; hardness tests performed, data entered in Powerway SPC; hardness results that have failed sent to QA Manager
3 QC Inspector Upon receipt of results Traveler, calibration sheet  sheet from Inspector File paperwork; Send  any hardness inspection data that fail to QA Manager. Traveler, calibration sheet to calibration log file; failed hardness inspection data to QA Manager
4 QA Manager Upon receipt of failed hardness inspection data Failed hardness inspection data and heat treater's certification Reconcile hardness differences with heat treater; issue car (TOP: CARRR) if needed. Hardness differences reconciled

*Trinity Forge has three different types of hardness testers:

  1. King (Brinell) Tester w/10mm tungsten ball: Indention is indented into prepared surface of sample and measured with one of two Brinell scopes available
  2. Newage Versitron (Rockwell tester): Capable of testing on B & C scale with 1/64" ball and 130 degree diamond cone penetrators respectively.
  3. Equip/Tip portable impact tester: Capable of conversion to Rc, Rb, and Brinell scales.
*Trinity Forge General Hardness Chart

Lot Size          Sample Size           Defects Accepted            Defects Rejected

1-5   All   0   0
6-10   1   0   1
11-20   2   0   1
21-50   3   0   1
51-100   4   0   1
101-200   6   0   1
201-400   10   1   2
401-600   13   1   2
601-1000 16   1   2
1001+   20   2   3

 

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