Surface integrity of GH4169 affected by cantilever finish grinding and the application in aero-engine blades

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• 作者：Xun Li ; ^{lixun@buaa.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; ^{lixunbuaa@163.com" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Shuang Ma ; Fanjun Meng
• 关键词：Blade ; Cantilever ; GH4169 ; Grinding ; Surface integrity
• 刊名：Chinese Journal of Aeronautics
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：28
• 期：5
• 页码：1539-1545
• 全文大小：1943 K

文摘

GH4169 is the main material for aero-engine blades and integrated blisks. Because GH4169 has a poor milling performance, the profile precision and surface integrity of blades and integrated blisks are difficult to be met by utilizing the conventional milling process, which directly influence the global performance and reliability of aero-engines. Through grinding experiments on parameters and surface integrity optimization, the helical cantilever grinding process utilizing a 300# CBN RB wheel is presented and applied in finish machining of GH4169 blades. The profile errors of the blade surface are within ±0.01 mm, the roughness is less than 0.4 μm, the residual compressive stresses and the hardening rate are appropriate, there are no phenomena of burr and smearing with the grinding chips, and the leading/trailing edge can be smoothly connected with the suction/pressure surface. All the experimental results indicate that this grinding process is greatly suitable for the profile finish machining of GH4169 blades.