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Product description: Spherical cap for storing a single sphere. This permits realisation of artificial hip joint sockets, sliding bearings, hydrostatic bearings or even cardan suspensions, for example.
Workpiece data: Exterior diameter: 30.00 mm; interior diameter: 5.00 mm; height: 20.00 mm; material: 1.4571 (rust- and acid-resistant stainless steel V4 A)
PEM task: Manufacture of the exact spherical cap form displaying the best possible surface roughness
PEM solution: Electrode made of ball bearing steel, soldered on on one side.
Process parameters: Roughing process – premachining (roughing) at high speed and low current: generator current of 600 A, erosion depth of 9.50 mm, feed rate of 0.25 mm/min., machining time of 40 min., surface roughness of Ra < 0.05 µm
Smoothing process: Fine-machining at reduced speed and higher current (smoothing): generator current of 1200A, erosion depth of 0.50 mm (overall depth is therefore 10.00 mm), feed rate of 0.09 mm/min., machining time of 6 min. (overall machining time is therefore 46 min.), surface roughness of Ra < 0.05 µm.
Machining in solid material – 8 parts simultaneously.
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