ABRASIVE WATER-JET CUTTING BY MOSES DHILIP KUMAR
Abrasive water jet cutting is an extended version of water jet cutting; in which the water jet contains abrasive particles such as silicon carbide or aluminium oxide in order to increase the material removal rate above that of water jet machining.
Almost any type of material ranging from hard brittle materials such as ceramics, metals and glass to extremely soft materials such as foam and rubbers can be cut by abrasive water jet cutting.
WORKING PRINCIPLE :
The narrow cutting stream and computer controlled movement enables this process to produce parts accurately and efficiently. This machining process is especially ideal for cutting materials that cannot be cut by laser or thermal cut. Metallic, non-metallic and advanced composite materials of various thicknesses can be cut by this process. This process is particularly suitable for heat sensitive materials that cannot be machined by processes that produce heat while machining.
The schematic of abrasive water jet cutting is similar to water jet cutting apart from some more features underneath the jewel; namely abrasive, guard and mixing tube. In this process, high velocity water exiting the jewel creates a vacuum which sucks abrasive from the abrasive line, which mixes with the water in the mixing tube to form a high velocity beam of abrasives.
Advantages of abrasive water jet cutting
· In most of the cases, no secondary finishing required
· No cutter induced distortion
· Low cutting forces on work pieces
· Limited tooling requirements
· Little to no cutting burr
· Typical finish 125-250 microns
· Smaller kerf size reduces material wastage
· No heat affected zone
· Localities structural changes
· No cutter induced metal contamination
· Eliminates thermal distortion
· No slag or cutting dross
· Precise, multi plane cutting of contours, shapes, and bevels of any angle.
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