1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW15424 Procedure for Evaluating Parting Lines Copyright 2012 General Motors Company All Rights Reserved December 2012 Originating Department: North American Engineering Standards Page 1 of 4 1 Scope Note: Nothing in this standard supercedes applicabl
2、e laws and regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. Part approval process. 1.2 Foreword. Not applicable. 1.3 Applicability. All visible or customer contact plastic parts. 2 References Note: Only th
3、e latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. None 3 Resources 3.1 Facilities. Not applicable. 3.2 Equipment. Molded parts from production tooling (not the tool or cold pour impressions from tooling
4、). 3.3 Test Vehicle/Test Piece. Minimum of two (2) samples. 3.4 Test Time. Not applicable. 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. Not applicable. 4 Procedure 4.1 Preparation. Parts should be installed in vehicle or buck; if property is not available, the part is held in
5、 approximate installed position. 4.2 Conditions. Not applicable. 4.2.1 Environmental Conditions. Not applicable. 4.2.2 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates, report
6、s, etc. 4.3 Instructions. 4.3.1 Evaluate parting line; visual and tactile (perceptible to the touch). 4.3.2 Visually and tactilely inspect parts for parting line execution. 4.3.3 Test Sample Preparation. Tool mismatch parting line core to cavity; parting line at edge of part. See Figure 1 and Figure
7、 2. 4.3.4 Maximum 0.05 mm mismatch, unless otherwise specified, or designed as an offset. 4.3.5 Texture execution stops at 0.25 mm minimum to 0.50 mm maximum to protect parting line appearance. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo
8、 reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15424 Copyright 2012 General Motors Company All Rights Reserved December 2012 Page 2 of 4 Figure 1: Tool Mismatch and Parting Line Texture Execution Max. = maximum Figure 2: Edge of Part Texture
9、Execution Max. = maximum Min. = minimum 4.3.6 Seamless Execution Parting Line. See Figure 3. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS
10、 GMW15424 Copyright 2012 General Motors Company All Rights Reserved December 2012 Page 3 of 4 Figure 3: Seamless Execution Requirements Lifter/Slide Parting Line and Tactile Surface Parting Line Max. = maximum 4.3.7 No Tool Mismatch Allowed. Applies to: 4.3.7.1 Parting line on A-surface (lifter/slid
11、e to cavity). 4.3.7.2 Core to cavity on tactile parts (handles, knobs, switches, etc.) 4.3.8 Texture execution stops at 0.10 mm minimum to 0.20 mm maximum to protect parting line appearance. 4.3.9 The part submission and evaluation procedure is repeated until all issues are in agreement. 5 Data 5.1
12、Calculations. Not applicable. 5.2 Interpretation of Results. Not applicable. 5.3 Test Documentation. Global Grain Instruction Form (GIF), Appearance Approval Report (AAR). 6 Safety This standard may involve hazardous materials, operations, and equipment. This standard does not propose to address all
13、 the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 7 Notes 7.1 Glossary. Appearance Approval Report (AAR) Form: Used to docume
14、nt parting line non-compliance at the time of Production Part Approval Process (PPAP) appearance submission. Global Grain Instruction Form (GIF): Used to document parting line non-compliance at the time of Surface Quality Evaluation. 7.2 Acronyms, Abbreviations, and Symbols. AAR Appearance Approval
15、Report GIF Global Grain Instruction Form PPAP Production Part Approval Process 7.3 Figures are not to scale. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGIN
16、EERING STANDARDS GMW15424 Copyright 2012 General Motors Company All Rights Reserved December 2012 Page 4 of 4 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Test to GMW15424 9 Release and Revisions This standard was originated in August 2006. It was
17、 first approved by Global Appearance Quality in October 2007. It was first published in November 2007. Issue Publication Date Description (Organization) 1 NOV 2007 Initial publication. 2 DEC 2012 Update content for 5 Year Refresh project. (Global Design Quality) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
