1、WORLDWIDEENGINEERINGSTANDARDSTest Procedure GMW14690Methods of Test for Sound Deadener Pads; Test for Formability Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Originating Department: North American Engineering Standards Page 1 of 21 ScopeNote: Nothing in this standard superc
2、edesapplicable laws and regulations.Note: In the event of conflict between the Englishand domestic language, the English language shalltake precedence.1.1 Purpose. This standard shall be used todetermine the formability of sound deadenermaterials used in automotive body trimapplications. The test si
3、mulates the productionbaking process under laboratory conditions.Formability of deadener materials, as determinedby this test method, shall be defined as the abilityof the material to comply with the contours of astandard steel test panel when subjected to thebaking conditions (see Table 1).1.2 Fore
4、word. Not applicable.1.3 Applicability. Not applicable.2 ReferencesNote: Only the latest approved standards areapplicable unless otherwise specified.2.1 External Standards/Specifications.None2.2 GM Standards/Specifications.GMW2 GMW32212.3 Additional References.None.3 Resources3.1 Facilities. Not app
5、licable.3.2 Equipment.3.2.1 Test apparatus for conditioning according toGMW3221 Code A.3.2.2 Any forced-air drying oven capable ofmaintaining the specified temperatures within thespecified tolerances.3.3 Test Vehicle/Test Piece. Tests shall beperformed using steel test panels according toGMW2M-ST-S.
6、 The test panels shall comply withthe dimensions shown in Figure 1.3.3.1 From the available material, test pieces(250 0.5) mm x (50 2) mm x thickness ofdeadener pad shall be taken. The direction ofsampling is unimportant.3.3.2 For initial sample approval and arbitrationpurposes, at least three (3) t
7、est pieces shall betested. For routine quality control, at least one (1)test piece shall be tested.3.4 Test Time. Not applicable.3.5 Test Required Information. Not applicable.3.6 Personnel/Skills. Not applicable.Figure 1: Test Panels4 Procedure4.1 Preparation. Tests pieces shall be conditionedto GMW
8、3221 Code A.4.2 Conditions.4.2.1 Environmental Conditions. Not applicable.4.2.2 Test Conditions. Deviations from therequirements of this standard shall have beenagreed upon. Such requirements shall be specifiedCopyright General Motors Company Provided by IHS under license with General Motors Company
9、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARD GMW14690 Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Page 2 of 2on component drawings, test certificates, reports,etc.4.3 Instructions.4.3.1 Immediately afte
10、r conditioning, test piecesshall be placed centrally on the steel test panel andsubjected to the baking conditions.4.3.2 The baked test piece shall then be allowed tocool to (+23 5) C before evaluation.4.3.3 Baking Conditions. Unless otherwiseindicated, the baking conditions in Table 1 shallapply to
11、 the test pieces.Table 1: Bake ConditionsBakeDescriptionMinimum(Time at MetalTemperature)Maximum(Time at MetalTemperature)StandardProcess- Paint Shop(use forMaterial Types1 thru 5)15 minutes at125 C Note 1(257 F) Note 160 minutes at190 C Note 2(374 F) Note 2Non-compressed3-Wet Process- Paint Shop(Us
12、e forMaterial Types1A thru 5A)3-Wet10 minutes at140 C Note 1(285 F) Note 33-Wet20 minutes at163 C Note 1(325F) Note 3Note 1: Represents the minimum bake for a Low Bake,Solventborne Primer Surfacer.Note 2: Represents the maximum bake for a High Bake,Powder Primer Surfacer.Note 3: Represents the minim
13、um/maximum bake for a 3-WetSealer Oven.5 Data5.1 Calculations. Not applicable.5.2 Interpretation of Results. After test, the testpiece shall be closely examined to determine thedegree to which it has conformed to the shape ofthe steel test panel during the baking process.Unless otherwise specified o
14、n drawings, materialspecifications, etc., the test piece shall closelyconform to the contours of the steel test panel.5.3 Test Documentation. The test results shall berepresented in a test report.6 SafetyThis standard may involve hazardous materials,operations, and equipment. This standard does notp
15、ropose to address all the safety problemsassociated with its use. It is the responsibility of theuser of this standard to establish appropriate safetyand health practices and determine theapplicability of regulatory limitations prior to use.7 Notes7.1 Glossary.Formability: The ability of the deadene
16、r materialto comply with the contours of a standard steel testpanel when subjected to the baking conditions.7.2 Acronyms, Abbreviations, and Symbols. Notapplicable.8 Coding SystemThis standard shall be referenced in otherdocuments, drawings, etc., as follows:Formability to GMW146909 Release and Revi
17、sionsThis standard was originated in October 2005. Itwas first approved by the Global Materials Team inFebruary 2007. It was first published in July 2007.Issue PublicationDate Description (Organization)1 JUL 2007 Initial publication.2 OCT 2012 Five-year refresh. (GlobalDamping Material Team)Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
