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**NEW FOR WINWARD**
CNC Plasma cutting
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Winward can now boast in-house plasma cutting now available. Plasma cutting is suitable for various materials particularly mild steels and stainless steels producing an excellent edge finish. CNC plasma cutting is a process of cutting 2D shapes from sheet metal using a high temperature, high velocity stream of ionized gas. The plasma stream is generated by directing the flow of an inert gas through an orifice where an electric arc ionizes the gas. The material is thereby heated to a molten condition and the high velocity gas stream blows the material away. This can cut 1” mild steel., or anything ranging from gauge up to 2”. However we cut it, we get squarer edges, and clean, consistent parts. The RUR profile cutting machine is designed specifically for our high production demand. The machine frame is constructed from a mild steel fabricated design, ultrasonically stress relieved and manufactured to highly accurate tolerances. The machine is driven through twin side rack and pinion drives by servo motors and planetary gearboxes which are digitally synchronised. The rail system is manufactured using precision ground bar mounted on box section which is fitted on to thick walled fabricated track stands.With the RUR range of machines, we are able to configure machine widths and lengths to suit our own requirements. This could be to allow for larger plate sizes, or to provide the capability to load/unload and cut plates simultaneously in order to minimise downtime. |
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CNC plasma cutting offers low cost since no custom tooling is needed and is especially cost effective for thick metal sheets. CNC plasma cutting can usually cut thicker sheets than laser. The process is generally used to cut 2D shapes not requiring high precision or fine detail. |
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designconsiderations
•The cut edge will have an oxide layer. •The angle of the edge can deviate from 90 degrees typically by 10 to 20 deg.
•Some warping can occur on intricate parts. • As in blanking and piercing, considerable economies can be obtained by nesting parts, and cutting along common lines. In addition, secondary deburring operations can be reduced or eliminated. |
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CNC Plasma Cutting Process
The Pilot Arc type uses a two cycle approach to producing plasma, avoiding the need for initial contact. First, a high-voltage, low current circuit is used to initialize a very small high-intensity spark within the torch body, thereby generating a small pocket of plasma gas. This is referred to as the pilot arc. The pilot arc has a return electrical path built into the torch head. The pilot arc will maintain itself until it is brought into proximity of the workpiece where it ignites the main plasma cutting arc. Plasma arcs are extremely hot and are in the range of 25,000 °C (45,000 °F).[1] Plasma is an effective means of cutting thin and thick materials alike. Hand-held torches can usually cut up to 2 inches (51 mm) thick steel plate, and stronger computer-controlled torches can cut steel up to 6 inches (150 mm) thick. Since plasma cutters produce a very hot and very localized "cone" to cut with, they are extremely useful for cutting sheet metal in curved or angled shapes. |
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winward engineering limited.
