某超高强度钢零件小孔挤压强化工艺研究

Study on the Technology of Small Hole Extrusion Strengthening for a Super High Strength Steel

起落架与机体同寿命是现代高寿命飞机的普遍要求。对于起落架主要承力件,除优化设计外,在选材上应选用300M、A100超高强度钢及钛合金等高强度、高韧度材料,并采用先进的表面强化技术及先进工艺等。小孔挤压强化技术是通过在孔周围施加一定的残余应力,从而显著地提高带孔零件的疲劳寿命。通过对超高强度钢零件薄壁上小孔内表面进行挤压强化工艺的研究,针对超高强度钢小孔孔壁挤压强化的工艺方法,找到了合理的挤压参数,并应用于产品的加工。

The landing gear and the plane have the same life is a common requirement of modern high life of the aircraft. For landing gear main bearing parts, in addition to the optimization design and material application of 300M, A100 ultra high strength steel and titanium alloy high strength and high toughness material, and adopt the advanced surface strengthe- ning technology and advanced process. The small hole extrusion technology is through the hole around the application of a certain residual stress, so as to significantly improve the fatigue life of the parts with holes. Based on the research of ultra high strength steel thin-walled parts holes in surface extrusion strengthening technology, propose methods of ultra high strength steel of steel of keyhole wall extrusion process for strengthening, find reasonable extrusion parameters, and apply to the processing of products.