GMW GMW15676-2012 Door Window System - Glass Scratch Durability Issue 2 English.pdf
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1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW15676 Door Window System - Glass Scratch Durability Copyright 2012 General Motors Company All Rights Reserved November 2012 Originating Department: North American Engineering Standards Page 1 of 12 1 Scope Note: Nothing in this standard supercedes a
2、pplicable laws and regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. To determine the potential for the door glass to be scratched as a result of dirt accumulation on the glass and in the belt seals during
3、cycle testing of power or manual window systems. 1.2 Foreword. Not applicable. 1.3 Applicability. This procedure applies to all passenger cars and light duty trucks having conventional vertical dropping power or manual window systems. 2 References Note: Only the latest approved standards are applica
4、ble unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. GMW15081 GMW15938 2.3 Additional References. Global Subsystem Technical Specifications (GSSTS) Outer Belt Molding Component Technical Specifications (CTS) Vehicle Technical Specifications (VT
5、S) 3 Resources 3.1 Facilities. 3.1.1 Major Facility. GMNA Body Test Lab located within the Vehicle Performance Center (VPC) at the GM Technical Center in Warren, MI or a similarly equipped test facility. 3.1.2 Minor Facility. For on-body testing, testing requires sufficient floor space and work area
6、 to perform this test. For off-body testing, testing requires a door cart or fixture capable of holding the test material in approximate design position. 3.2 Equipment. The following list(s) include fixturing and instrumentation typically used by the GMNA Body Test Lab to perform this test. Other eq
7、uipment may be substituted at the discretion of the testing facility as long as it provides the same data and/or data record, with equivalent accuracy as specified herein or by the requestor. 3.2.1 Fixturing. 3.2.1.1 If the door is not on a body, then it must be rigidly clamped to a fixture, such as
8、 a lab door cart, that can constrain it in approximate design position. 3.2.1.2 If testing a window system where the glass is allowed to drop completely out of view (i.e., below the beltline as seen on most front doors), a mechanical stop fixture (block, etc., attached to the window regulator slide/
9、carrier, etc.) must be made in order to keep the top edge of the glass from dropping below the beltline. 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 ENGINEERI
10、NG STANDARDS GMW15676 Copyright 2012 General Motors Company All Rights Reserved November 2012 Page 2 of 12 The reasoning for this is that it is not desirable to have the belt seals wipe the glass scratch test material from the surface and off of the edge of the glass on the 1st down cycle after the
11、test material has just been applied. Note: For power window systems, rather than creating a mechanical stop, the GMNA Body Test Laboratory uses a proximity sensor that stops the glass in the desired down position when a piece of metallic tape on the glass passes in front of the sensor. If this metho
12、d is chosen, then fixturing will be needed to secure the proximity sensors as shown in Figure A1. Note: Do not place an object at the bottom of the door in order to stop glass down travel. This introduces non-typical external forces to the glass and may twist, bend, or misalign the window regulator
13、while leaving no visual implications of this. 3.2.1.3 Manual window handle crank adapter, if testing a manual window system. 3.2.2 Instrumentation. 3.2.2.1 Still camera, or video camera to record test results throughout the test. 3.2.2.2 If testing power window systems, the GMNA Body Test Laboratory
14、 uses controllers (fabricated within the laboratory) that are dedicated to cycling power windows. Within each controller is a Programmable Logic Controller (PLC) that allows the user to cycle up to four windows at any given cycle frequency (i.e., 1 cycle per 45 s, 1 cycle per 90 s, etc.) and within
15、the voltage range of 0 V to 20 V DC. 3.2.2.3 If testing manual window systems, the GMNA Body Test Laboratory uses controllers (fabricated with the laboratory) that are dedicated to cycling manual windows. An Alternating Current (AC) servo motor is used in conjunction with a manual window crank handl
16、e adapter in order to cycle the windows. The AC servo motor is set to provide a specified torque value to the manual crank handle as the glass reaches the full up position. 3.2.2.4 If proximity sensors are used to stop the glass at the desired down position, then one proximity sensor, including meta
17、llic tape, will be needed for each window system being tested (refer to Figure A1). 3.2.2.5 Weight scale to measure 15 g of glass scratch material per application. 3.2.3 Optional or Other Equipment. 3.2.3.1 Water spray bottle for moistening the glass and the test material (sand grit). 3.2.3.2 GM Gla
18、ss Cleaner Part Number 1050427. 3.2.3.3 Glass Scratch Test Material. 3.2.3.3.1 Glass Scratch Recipe. Table 1 is the latest recipe used for the glass scratch test. This is a dry mix that is applied to the “wetted” glass surface. To create the recipe, filter each ingredient through a 1 mm sieve. Then
19、mix the prescribed ingredients in the correct ratios by weight as shown in the table. Table 1: Glass Scratch Recipe and the Material Accessibility Material Amount Supplier Address Contact Fire Clay 900 g A P Green Phone: (734) 287-2150 Cinders 900 g Oerther Brothers Excavating Company 3500 North Mon
20、roe St. Monroe, MI 48162 Phone: (734) 241-0766 Play Sand 900 g DPW Milford Proving Grounds Powder Valley Rd. Milford, MI Phone: (248) 685-5000 Block Mix 1080 g Stoneco Ottawa Lake Quarry 7555 Whiteford Lake Rd. Ottawa Lake, MI 49267 Phone: (734) 854-2262 3.3 Test Vehicle/Test Piece. 3.3.1 Test Mater
21、ial. It is recommended that a complete door system be provided for this test. Discuss with the requesting engineer whether or not the interior trim pad needs to be present during the test. Some trim pads exert force on the inner belt seals that may cause a tighter fit between the glass and the belt
22、seals. Some trim pads also come with the inner belt seal as Part Of Assembly (POA). A body or some fixture that represents the body will be necessary, if testing a frameless glass system, since it is difficult to represent factors such as door overcrown. The body seals that interface with the glass,
23、 etc., without a body or fixture that represents the body. 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 GMW15676 Copyright 2012 General M
24、otors Company All Rights Reserved November 2012 Page 3 of 12 It is recommended that the test parts/assembly be dimensionally certified before testing is started (see 4.1.1.1). 3.4 Test Time. The following is an estimate of the amount of time (work-hours) needed to perform this procedure. Note: These
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