Hammer bushing with softened outer region

An exemplary bushing (122) of a hydraulic hammer tool (116) includes an outer region (604) and an inner region (602). The inner region (602) has a relatively greater hardness than the outer region (604). The inner region (602) may also be compressively stressed, and the outer region (604) may have tensile stress. When the hammer (120) of the hydraulic hammer tool (116) is held in alignment by the bushing (122), the stress and/or hardness profile of the bushing (122) may enhance its wear and wear defects. The outer region (604) of the bushing (122) may be relatively soft, resulting in the bushing (122) having a relatively high level of toughness. The liner (122) may be formed using medium to high carbon steel by roughing the liner (122), hardening the liner (122), tempering the liner (122), and inductively softening an outer region (604) of the liner (122). 一种液压锤工具(116)的示例性衬套(122)包括外区域(604)和内区域(602)。内区域(602)具有比外区域(604)相对更大的硬度。内区域(602)也可以是压缩应力的，而外区域(604)可以具有拉伸应力。当液压锤工具(116)的锤(120)通过衬套(122)保持对准时，衬套(122)的应力和/或硬度分