公开(公告)号：WO2016164789A1

公开(公告)日：2016-10-13

申请号：PCT/US2016/026741

申请日：2016-04-08

Applicant: METAL IMPROVEMENT COMPANY, LLC

Inventor： HACKEL, Lloyd A.

IPC: C21D1/06 ,  C21D1/78 ,  C21D7/06 ,  C21D10/00

CPC classification number: C21D1/18 ,  C21D1/10 ,  C21D1/42 ,  C21D7/06 ,  C21D7/08 ,  C21D9/0068 ,  C21D9/28 ,  C21D9/30 ,  C21D9/32 ,  C21D10/005 ,  C23C8/04 ,  C23C8/22 ,  C23C8/26 ,  C23C8/32 ,  C23C8/80 ,  Y02P10/253

Abstract: Metal components subject to wear or contact fatigue in a first area, and subject to bending, axial and/or torsional stress loading in a second area comprise a surface hardened, first surface layer in the first area; and a surface compressive-stress treated, second surface layer in the second area. The second surface layer has a material hardness different from, and typically lower than the first surface layer, and induced residual compressive stress to improve fatigue strength. Example components described include a gear, a cog, a pinion, a rack, a splined shaft, a splined coupling, a torqueing tool and a nut driving tool. A hybrid manufacturing process is described, including area-selective surface hardening combined with a process to add compressive stress to fatigue failure prone areas.

Abstract translation: 在第一区域中经受磨损或接触疲劳的金属部件，并且在第二区域中受到弯曲，轴向和/或扭转应力负载的金属部件包括第一区域中的表面硬化的第一表面层; 以及在第二区域中的表面压应力处理的第二表面层。 第二表层具有与第一表面层不同的材料硬度，并且通常低于第一表面层，并引起残余压应力以改善疲劳强度。 所描述的示例性部件包括齿轮，齿轮，小齿轮，齿条，花键轴，花键联接器，扭矩工具和螺母驱动工具。 描述了混合制造方法，包括面积选择性表面硬化以及将疲劳破坏倾向区域的压应力增加的过程。