Seal ring grooves are critical features on many oil and gas components, and require close tolerances and a high-quality surface finish. The high component value and complexity make process security essential. Adding to the challenges is the common use of difficult-to-machine materials solid Inconel 718 and cladded Inconel 625.
Many conventional methods for machining seal ring grooves have poor process security and slow down production. Existing conventional plunging and radial turning tools need to perform roughing and finishing in multiple operations, and they involve high cutting forces with limited tool life. When secure, these processes are slow and costly with no flexibility regarding groove-diameter size.
SpiroGrooving is a new, groundbreaking innovation – a simple yet sophisticated manufacturing process of grooves for sealing rings. The method is used with the CoroBore XL system and utilizes a spirograph tool path to create close-tolerance seal ring grooves in a very secure and productive way.
The tool path consists of tapered, circular ramping where the tool engagement is according to a set ramping-pitch for each revolution. An NC-code generator calculates the SpiroGrooving tool path based on a few input-parameters, such as groove diameter, process pitch and chosen maximum chip thickness. Tool presetting is done in a few simple steps.
This solution is ideal for making seal ring grooves in pre-clad machining of steel and stainless steel. The unique internal coolant solution of CoroBore XL facilitates machining in advanced materials. Roughing and finishing are carried out in the same operation, which significantly reduces machining time and improves productivity.
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