GMW GMW16820-2012 Mechanical and Quality Requirements for Die Drawn Suspension U-Bolts Issue 1 English [Replaced GMNA GM511M GMNA GM511M].pdf
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1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16820 Mechanical and Quality Requirements for Die Drawn Suspension U-Bolts Copyright 2012 General Motors Company All Rights Reserved November 2012 Originating Department: North American Engineering Standards Page 1 of 5 1 Scope 1.1 Material
2、Description. This standard covers the mechanical, material and quality requirements for two (2) grades of die drawn carbon and alloy steel suspension type U-Bolts in nominal thread diameters of M10 thru M24. The term U-Bolt as referred to herein applies to a cold drawn cylindrical rod, threaded on b
3、oth ends and formed as round bend or square bend U-Bolt. Property classes, Grade A and B, are designated as follows: GMW16820: Grade A. GMW16820: Grade A Stress Relieved. GMW16820: Grade B. GMW16820: Grade B Stress Relieved. 1.2 Symbols. Not applicable. 1.3 Typical Applications. Leaf Spring U-Bolts.
4、 1.4 Remarks. See Appendix A, Table A1 for regional cross reference chart. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM E18 SAE J403 SAE/USCAR-5 ISO 6157 SAE J417 SAE/USCAR-7 2.2 GM Standards/Specificatio
5、ns. GMW3059 GMW16551 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements 3.1 Requirements on Test Specimens. Not applicable. 3.2 General Requirements. 3.2.1 The tensile strength will take precedence to hardness. When the specified hardness
6、and tensile strength cannot be met simultaneously, a revised hardness range shall be established by agreement between the supplier and purchaser. 3.2.2 The U Bolt must be free of burrs which may be detrimental to satisfactory assembly, safe handling or function as defined by the purchaser. 3.3 Mater
7、ial and Process. 3.3.1 U Bolts shall be made of medium carbon or medium carbon alloy steel as shown in Table 1. 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 EN
8、GINEERING STANDARDS GMW16820 Copyright 2012 General Motors Company All Rights Reserved November 2012 Page 2 of 5 Table 1: Chemical Composition Requirements Property Class Material Description Steel Grade per SAE J403 Grade A and Grade A Stress Relieved Medium Carbon or Medium Carbon Alloy Steel 1050
9、, 1541, 1547,1548, 1552 Grade B and Grade B Stress Relieved Medium Carbon Alloy Steel 1541, 1547,1548, 1552 3.3.2 Threading Process. Threads shall be roll formed unless otherwise specified on the product drawing. Thread quality must meet GMW16551. 3.3.3 Cleaning. Concentrated acids, such as, hydroch
10、loric acid, shall not be used during the manufacturing or plating/coating of the U-Bolt. 3.3.4 Stress Relief. Grade A Stress Relieved and Grade B Stress Relieved shall be identified on the drawing as shown in 1.1. Finished U-Bolts shall be stress relieved at a temperature of not less than 288 C for
11、a minimum of 30 minutes. 3.3.5 Hydrogen Embrittlement. All U-Bolts processed through a hydrogen generating process, such as acid cleaning or electroplating, shall be hydrogen embrittlement relieved per SAE/USCAR-5. Verification of embrittlement relief shall be performed per SAE/USCAR-7. 3.4 Mechanic
12、al Properties. 3.4.1 The U-Bolts shall meet the Mechanical Properties shown in Table 2. The listed tensile strength represents the minimum value for the threaded portion of one U-Bolt leg. Table 2: Mechanical Properties Property Class Tensile Strength, (Rm) Minimum Yield Strength, Minimum Hardness,
13、HRc, for Reference Hardness, Vickers HV10 for Reference Grade A and Grade A Stress Relieved 900 MPa 720 MPa 25 to 32 280 Grade B and Grade B Stress Relieved 1040 MPa 832 MPa 30 to 36 320 3.4.2 Mechanical properties shall be determined by testing the U-Bolt over a test saddle. The Saddle Tensile Test
14、 is described in A1.1. Hardness Testing is described in A1.2. The minimum tensile load, (LT) in kilonewton (kN) based on the Tensile Strength, (Rm) in Megapascals (MPa) shown in Table 2 for a saddle tensile test of a complete U-Bolt is calculated as follows: LT minimum = 0.0016991 (As x Rm) As = 0.7
15、854 (D - 0.9382P) 2 Where As =Thread Stress Area in mm2, D = Nominal Thread Diameter in millimeters (mm) and P=Thread Pitch in millimeters (mm). Example: M14 U-Bolt with Thread Pitch=2.00 mm As =0.7854(14.00-0.9382(2.00)2 = 115.44 mm2 LT minimum = 0.0016991(115.44 900) = 176.51 kN Copyright General
16、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 GMW16820 Copyright 2012 General Motors Company All Rights Reserved November 2012 Page 3 of 5 3.4.3 Surface har
17、dness shall not exceed base metal hardness by more than two (2) points, Hardness Rockwell (HRc) equivalent. 3.5 Surface Discontinuities. U-Bolts shall not have surface discontinuities exceeding the limits specified in ISO 6157. Surface discontinuities for sizes and lengths not covered in the scope o
18、f ISO 6157 shall be defined by the responsible GM Fastener Engineer. Discontinuities at the root of the thread due to use of serrated thread forming dies are permissible if the serrations do not affect the mechanical properties of the thread. 4 Manufacturing Process 5 Rules and Regulations 5.1 Legal
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