FORD WD950 APPENDIX A-1993 MATERIAL AND PERFORMANCE REQUIREMENTS FOR CASE HARDENED CARBON STEEL THREAD CUTTING SCREWS - TYPE D《表面硬化的碳钢攻丝螺钉(D型)的材料和性能要求》.pdf
《FORD WD950 APPENDIX A-1993 MATERIAL AND PERFORMANCE REQUIREMENTS FOR CASE HARDENED CARBON STEEL THREAD CUTTING SCREWS - TYPE D《表面硬化的碳钢攻丝螺钉(D型)的材料和性能要求》.pdf》由会员分享,可在线阅读,更多相关《FORD WD950 APPENDIX A-1993 MATERIAL AND PERFORMANCE REQUIREMENTS FOR CASE HARDENED CARBON STEEL THREAD CUTTING SCREWS - TYPE D《表面硬化的碳钢攻丝螺钉(D型)的材料和性能要求》.pdf(2页珍藏版)》请在麦多课文档分享上搜索。
1、FORD WORLDWIDE FASTENER STANDARDDate: 1993-01-01Engineering Standards & 1 of 2 Printed copies are uncontrolled .Systems Engineering (ESSE)WD 950APPENDIX AMaterial and Performance Requirements for Case Hardened Carbon Steel Thread Cutting Screws - Type D1. SCOPE.This appendix covers the requirements
2、for Thread Cutting Screws not specified in the body of WD 950. Unless otherwise specified all other requirements of WD 950 apply.1.1 REFERENCES.ISO 1502 - General purpose metric screw threads - Gauging.2. MATERIAL.Screws shall be made from cold heading quality, killed steel wire suitable for case ha
3、rdening.3. METALLURGICAL REQUIREMENTS.3.1 CORE HARDNESS, SURFACE HARDNESS AND MICROSTRUCTURE. These shall bespecified in Clauses 3.1, 3.2 and 3.4 of the specification.3.2 TOTAL CASE DEPTH. A microhardness test shall be carried out at the thread flank mid-pointbetween crest and root or, in the case o
4、f smaller screws up to (M)4, in the root of the thread. Thecase depth shall be at the point where the hardness exceeds the actual core hardness by HV25 andshall be in accordance with the following:Screw Size Total Case Depth(M)2 and (M)3(M)4 and (M)5(M)6 and larger0.05 - 0.018mm0.1 - 0.23mm0.15 - 0.
5、28mm4. PERFORMANCE REQUIREMENTS.4.1 DRIVE TEST. Thread cutting screws shall meet the same thread forming requirements as thespaced thread tapping screws when tested in a test plate of the material specified in Clause 4.1 ofthe specification. Test plate thickness and the diameter of holes shall be as
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