2、的影响,并优选工艺参数获得理想的内螺纹,为进一步提高内螺纹的表面质量和疲劳性能提供新的依据。试验结果表明,Q460高强度钢内螺纹冷挤压加工宜采用一次成形工艺,选用黏度值在10~12的流体薄油膜润滑液进行冷却润滑,工件底孔直径最佳取值范围在d21.20mm~d21.30 mm1之间,一般选取的挤压速度为30~60mm∙min 。关键词:内螺纹挤压扭矩温度测试系统中图分类号:TG376.2Experimental Research on ColdExtruding of InternalThreadin Q460HighStrengthSteel1,2212MIAO Hon
3、g ZUO Dunwen ZHANGRuihong WANG Min (1. Collegeof Mechanical Engineering,Yangzhou University, Yangzhou 225000; 2. Mechanical Engineering Institute, Nanjing UniversityofAeronautics andAstronautics, Nanjing 210016)Abstract:Traditionalcoldextrusion processofinternalthreadisonlyfitforprocessi
5、dnumbertimes ofextrusionon wearand fracture ofthe tap and manufacturingquality ofthe internalthread is great.The process ofcold extrusion ofQ460 highstrengthsteelinternalthread is studied through experiments.The effectoflubricant,holediameter,extrusion speed and numbertimes ofextrusion o
6、n extrudingtorque and extrudingtemperature is analyzed.And the idealinternalthread is obtainedthrough optimizingtechnologicalparameters. Itprovidesthefoundation forincreasingthe surface quality and the fatigue property ofinternalthread.The testresultsshowthatQ460highstrengthsteelinternal
7、thread is formed by cold extrusion through onestep formingtechnology.The fluidic thin filmlubrication whoseviscositynumberis between10and 12 wasselected.Thebestrangeofholediameterofthe work is betweend21.20 mmandd21.30 mm.Andtherotatespeedofthe 11machinetoolisoften select