GMW GMW3157-2012 Durability Test for Life Assessment of Engine Radial Shaft Lip Seals Issue 2 English.pdf
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1、 WORLDWIDE ENGINEERING STANDARDS General Specification GMW3157 Durability Test for Life Assessment of Engine Radial Shaft Lip Seals Copyright 2012 General Motors Company All Rights Reserved April 2012 Originating Department: North American Engineering Standards Page 1 of 25 1 Introduction Note: Noth
2、ing in this standard supercedes applicable laws and regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Scope. 1.1.1 This group of tests establishes the requirements of gas and diesel engine radial lip seal systems. 1
3、.1.2 Criteria. Validation using GMW3157 means: Completing all relevant tests described herein without leakage. Using production-intent design parts in all of the tests. Using production-intent processes whenever possible. Even if production-intent processes are not used, the parts must conform to al
4、l engineering specifications including surface finish. 1.2 Mission/Theme. 1.2.1 This group of tests is suited to the evaluation of passenger car and light duty truck unidirectional rotating crankshaft seals, using both elastomeric and polytetrafluoroethylene (PTFE) lips that experience thermal, rota
5、tional, and environmental inputs during service. 1.2.2 Camshaft. Test camshaft seals at one-half the crankshaft speeds and other deviations as specified (see 1.2.3 and 1.2.4). Written approval of the release engineer must be given for deviations. 1.2.3 This standard is not intended for bi-rotational
6、 (i.e., axle shaft) or reciprocating sealing elements (i.e., valve guide seals, bonded piston rings, etc.) 1.2.4 The Sealrater Test is for Production Part Approval Process (PPAP) validation of multiple tool cavities and non-functional changes to the seal design, contingent on the design passing (or
7、having passed) the lifetime durability test. Changes requiring complete revalidation include, but are not limited to, changes in lip material, seal production processes, mating component surface finish and designed interference (form, fit, and function). The use of the Sealrater test only to satisfy
8、 a revalidation for process changes must be approved by the release, validation, and supplier quality engineers. 1.2.5 Certain applications may not require completion of the mud/slurry test (e.g., camshaft seals or rear crankshaft seals). Written approval of the release engineer must be given for su
9、ch deviations and recorded in the test report. 1.2.6 Representative Parts. Validation tests must use production intent design and/or manufacturing processes parts. Key characteristics of the parts must be measured and documented before the procedure is run. 1.3 Classification. Not applicable. 2 Refe
10、rences Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASME 95 ISO 4287 ASME B46 ISO 6194-3 ASTM E18 ISO 12103-1 DIN 3761 SAE J946 ISO 2372 2.2 GM Standards/Specifications. 9985522 GMW16077 GMW3059 GMW16078 GMW14872 GMW16095
11、GMW15827 GMW16096 GMW16076 GMW16676 2.3 Additional References. 88861206 GM Service Part for Indicator Dye 88861276 GM Service Part for Indicator Dye RMA 0S6 Rubber Manufacturers Association Bulletin RMA 0S18 Technical Bulletin 3 Test Preparation and Evaluation 3.1 Resources. Copyright General Motors
12、 Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3157 Copyright 2012 General Motors Company All Rights Reserved April 2012 Page 2 of 25 3.1.1 Calibration. The tes
13、t facilities and equipment shall be in good working order and shall have a valid calibration label. 3.1.2 Alternatives. Alternative test facilities and equipment may also be used to meet global electrical requirements. However, all measuring variables as specified in this standard shall be determine
14、d correctly with respect to their physical definition. 3.1.3 Facilities. 3.1.4 Equipment. All approved labs must have this equipment unless otherwise specified. A schematic of the test system is in Appendix A1 and Appendix A2. Minor variations from the schematic (component layout) between test labs
15、is permitted provided it does not alter test results as verified in a common part test with a qualified lab(s). 3.1.4.1 Rotary Test Unit. The machine shall have a test head for retaining test fluid and positioning the seal(s) on a rotatable shaft supported by an externally mounted spindle. In additi
16、on, the following conditions are required: 3.1.4.1.1 The test head support must be sufficiently rigid to ensure minimum vibration. 3.1.4.1.2 Equipment capable of testing up to 150 mm outer diameter (OD) seal and 100 mm OD shaft diameter. 3.1.4.1.3 It shall be suitably constructed to maintain pressur
17、e and test fluid level required for the test. 3.1.4.1.4 The head shall be equipped with a collector for leak determination. 3.1.4.1.5 It shall be vented to the atmosphere; the length and diameter of vent pipe to be agreed upon between tester and requester. Running pressure and vacuum test will requi
18、re valves to close the vent pipe. 3.1.4.1.6 Internal pressure can be applied to the head with gauging to monitor the intended level. 3.1.4.1.7 The test head shall be designed and constructed to maintain a preset seal bore alignment to the test shaft axis within 0.05mm through the operating temperatu
19、re range. 3.1.4.1.8 Maximum rotational speed up to 8000 rmin-1 (8000 RPM) 3.1.4.1.9 Test temperature range of -40 to 150 C. 3.1.4.1.10 Spindle. The spindle must be capable of cycling and/or maintaining constant shaft speeds within 50 rmin-1 (50 RPM). The spindle must be sufficiently rigid to maintai
20、n shaft run out under dynamic conditions within 0.05mm up to 8000 rmin-1 (8000 RPM). See 3.2.3.4 3.1.4.1.11 Programmable rotational test equipment with a peak shaft speed of 8000 min-1 (8000 RPM) peed accuracy of 50 min-1 (50 RPM) adjustable shaft eccentricity of 0.50 0.05 mm total indicator reading
21、 (TIR), adjustable shaft to bore alignment of 0.50 0.05 mm TIR, and shaft fore-aft reciprocation of 1.0 0.1 mm. 3.1.4.1.12 Test head may be heated electrically and/or by heat transfer fluid. 3.1.4.2 Thermal Test Chamber with Temperature Controller. Chamber internal volume sufficient to house the com
22、ponents scheduled for test which can cycle from -40 to 150 3 C (-40 to 302 5 F) at a rate of 2 h to reach temperature limits and hold it for the required cycle limits (Tables 8 and 9). Test chamber must have plumbing and wiring access hole(s). Temperature controller with programming feature must mai
23、ntain 3 C of set temperature. Unit (with temperature indicator) must have multiple thermocouple channels to monitor chamber and part temperature. Sensor input must accept designated temperature measuring device. Due to different mass and size of rotary test heads, a higher electric or fluid heat com
24、pensation may be required to comply with the test cycle requirements. 3.1.4.3 Fume Hood or Vent. Appropriate industry approved construction and performance to prevent vapors as required by regulation. 3.1.4.4 Temperature Monitor. Computer controlled data analyzer capable of measuring in -40 to 150 C
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