1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW16854 Cup Ductility Test for Sheet and Strip Metal Copyright 2012 General Motors Company All Rights Reserved September 2012 Originating Department: North American Engineering Standards Page 1 of 3 1 Scope This standard covers the apparatus and proce
2、dure for a cup ductility test (22.2 mm (7/8 in) diameter ball type), applicable to metals in sheet and strip form. The test is used to provide information on the drawability of metals. Note: Nothing in this standard supercedes applicable laws and regulations. Note: In the event of conflict between t
3、he English and domestic language, the English language shall take precedence. 1.1 Purpose. Not applicable. 1.2 Foreword. Not applicable. 1.3 Applicability. This procedure is intended for use as part of the GM approval process for decorative and structural stainless steel sheet metal. 2 References No
4、te: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM E643 2.2 GM Standards/Specifications. None 3 Resources 3.1 Facilities. Not applicable. 3.2 Equipment. 3.2.1 The apparatus shall simulate a typical sheet metal forming press i
5、n which a cup-like impression is formed in sheet or strip metal by a male die pushing the metal into a female die or cavity while the metal is held under controlled conditions by grippers at the perimeter of the die cavity. 3.2.2 The apparatus shall be of the motor driven hydraulically actuated type
6、. 3.2.3 The gripping dies shall consist of an upper and lower die, made of hardened steel, ground on significant surfaces. The outside diameter of both dies shall be no less than 90 mm and the inside diameter of the lower die shall be 25.4 mm. Interchangeable upper dies shall be as shown in Table 1.
7、 Table 1: Sample Stock Thickness vs. Upper Gripping Die Diameter Stock Thickness (mm) Inner Diameter (ID) of Upper Die (mm) Thru 1.6 25.4 Over 1.6 thru 3.2 28.6 Over 3.2 thru 4.0 31.8 Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduct
8、ion or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16854 Copyright 2012 General Motors Company All Rights Reserved September 2012 Page 2 of 3 3.2.4 The radius on the inside diameter of the upper die gripping surface shall be maintained at 0.76 mm and smoot
9、hly polished. 3.2.5 The cupping tool shall be a finely polished 22.2 mm diameter hardened steel ball, free of surface pits, rust, etc. 3.2.6 The cup depth indicator shall be a standard dial indicator graduated in 0.025 mm increments and having a 25.4 mm travel. 3.2.7 The loading apparatus shall cons
10、ist of a motor driven pump and hydraulic system with a large dial to indicate pounds load and an adjustable calibrated valve to control the speed of load applications. 3.2.8 The gripping mechanism shall be such as to prevent slippage of the specimen during the test. 3.2.9 A diagram of a suitable app
11、aratus for this testing is shown in ASTM E643. 3.3 Test Vehicle/Test Piece. Not applicable. 3.4 Test Time. Not applicable. 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. Not applicable. 4 Procedure 4.1 Preparation. The sheet specimen shall be no less than 90 mm in either dimens
12、ion. It shall be free of burrs which might affect gripping of specimen. The specimen shall be wiped with a lightly oiled cloth to remove dirt and provide lubrication. Specimens having obvious defects should not be used. 4.2 Conditions. 4.2.1 Environmental Conditions. Testing shall be run at room tem
13、perature. 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, reports, etc. 4.3 Instructions. 4.3.1 Speed of Testing. The speed of testing shall be 0.1 mm/s to 0.5 mm/s, e
14、xcept during the final 1.3 mm of travel where it shall be controlled to 0.10 mm/s maximum. 4.3.2 End Point. The end point of the test is the cup depth at the maximum load reached during the test. The depth indicator shall be read just as the load indicator hand starts to drop. 5 Data 5.1 Calculation
15、s. Not applicable. 5.2 Interpretation of Results. Not applicable. 5.3 Test Documentation. Not applicable. 6 Safety This standard may involve hazardous materials, operations, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the responsibi
16、lity 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. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. GSSLT Global Subsystem Leadership Team ID Inner Diameter 8 Co
17、ding System This standard shall be referenced in other documents, drawings, etc., as follows: Test to GMW16854 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 ENG
18、INEERING STANDARDS GMW16854 Copyright 2012 General Motors Company All Rights Reserved September 2012 Page 3 of 3 9 Release and Revisions This standard was originated in August 2012. It was first approved by the Ferrous Metals GSSLT in September 2012. It was first published in September 2012. Issue Publication Date Description (Organization) 1 SEP 2012 Initial publication. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
