vahid.z
Mechanical
- Aug 14, 2017
- 11
Hi,
I have ground the crankshaft (material: VCN 150 with nitrided surface) of a linear reciprocating engine to remove its ovality. the minimum grinding depth was 0.01 mm and the maximum was 0.06 mm (0.05 mm ovality).
The engine documents claims that the non-uniformity of grinding depth results in non-uniform surface hardness and subsequently stress concentration and fatigue failure; and suggest re-nitriding the crankshaft after grinding to overcome to this problem.
Now, I want to know how much the fatigue failure possibility is important in this case (regarding the 0.05 mm difference in grinding depth which results in app. 2 HRC difference in hardness)? can I neglect that?if not, I can only do gas nitriding which results in white layer. In this case, how can I remove the layer?
Best regards,
Vahid
I have ground the crankshaft (material: VCN 150 with nitrided surface) of a linear reciprocating engine to remove its ovality. the minimum grinding depth was 0.01 mm and the maximum was 0.06 mm (0.05 mm ovality).
The engine documents claims that the non-uniformity of grinding depth results in non-uniform surface hardness and subsequently stress concentration and fatigue failure; and suggest re-nitriding the crankshaft after grinding to overcome to this problem.
Now, I want to know how much the fatigue failure possibility is important in this case (regarding the 0.05 mm difference in grinding depth which results in app. 2 HRC difference in hardness)? can I neglect that?if not, I can only do gas nitriding which results in white layer. In this case, how can I remove the layer?
Best regards,
Vahid