Scholarlink

<p>Involute gears are essential components of high-efficiency mechanical transmission systems, and hobbing is a machining process commonly used in their production due to its efficiency and precision. However, manufacturing gears from austenitic stainless steel presents technical challenges due to its high ductility, low thermal conductivity, and tendency for work hardening, which affects hob wear and gear quality. Thus, this study comparatively assesses the influence of PVD-TiAlN and PVD-TiSiN coatings on the progressive tool wear of carbide hobs and the quality of AISI 304 gears produced by hobbing. Experiments were conducted under constant cutting parameters, and hob wear was classified into three levels based on maximum flank wear. Gear quality was evaluated in terms of surface roughness, involute profile deviation, and surface microhardness. The results indicate that the TiAlN-coated hob exhibited more uniform tool wear and slightly better surface roughness at the lower wear level. Conversely, the TiSiN-coated hob performed better at the higher wear level, also resulting in higher surface microhardness. The medium wear level unexpectedly improved profile accuracy, suggesting a tool edge stabilization. Therefore, the findings offer technical insights for selecting hob coatings and managing tool wear in direct hobbing of stainless-steel gears, with the potential to reduce or eliminate finishing operations.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Influence of tool coatings on hob wear and surface quality in the hobbing of austenitic-stainless-steel gears

  • 期刊论文

  • 发表日期：

    2026年2月11日

查看全文
  • Carlos E. B. Rheinheimer,
  • André J. Souza

摘要

Involute gears are essential components of high-efficiency mechanical transmission systems, and hobbing is a machining process commonly used in their production due to its efficiency and precision. However, manufacturing gears from austenitic stainless steel presents technical challenges due to its high ductility, low thermal conductivity, and tendency for work hardening, which affects hob wear and gear quality. Thus, this study comparatively assesses the influence of PVD-TiAlN and PVD-TiSiN coatings on the progressive tool wear of carbide hobs and the quality of AISI 304 gears produced by hobbing. Experiments were conducted under constant cutting parameters, and hob wear was classified into three levels based on maximum flank wear. Gear quality was evaluated in terms of surface roughness, involute profile deviation, and surface microhardness. The results indicate that the TiAlN-coated hob exhibited more uniform tool wear and slightly better surface roughness at the lower wear level. Conversely, the TiSiN-coated hob performed better at the higher wear level, also resulting in higher surface microhardness. The medium wear level unexpectedly improved profile accuracy, suggesting a tool edge stabilization. Therefore, the findings offer technical insights for selecting hob coatings and managing tool wear in direct hobbing of stainless-steel gears, with the potential to reduce or eliminate finishing operations.