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Valves /
Relief valve holes
Relief valve holes
Objectives
- To create a straight hole meeting high tolerance and surface demands.
- To reduce the machining time while maintaining a reliable process.
Result
The process strategy with a solid carbide step drill and step reamer reduces the processing time and produces a straight hole with tight tolerances and an excellent surface finish.
Due to the C7 coating, tool life is increased considerably.
Machining process
Step 1: Solid carbide step drill
Drawing no. 252742/999997, N = 2580 rpm, Fn = 0.22 mm/rev.
Step 2: Step reamer
Drawing no. 212850/999999, N = 2546 rpm, Fn = 0.35 mm/rev.
Step 3: HSS tap
Drawing no. EN1270096
See video on machining cast iron valves
