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Wefapress on TwitterPE processing
Sawing
Cutting speed: 3000 - 4000 m/min (for calculating the number of revolutions of your blade diameter)
Feed rate: 0.1 - 0.2 mm per tooth
Material: carbide-coated sheets
Note: Circular saws - the higher the cutting speed, the cleaner the cut surface. Cutting speed limited by frictional heat (can be increased by cooling). Band saws (0.5 mm bevelled), curved cut etc. (feed rate 0.1 - 0.3 mm at approx. 1000 - 1500 m/min).
PE processing
Planing
Cutting speed: 250 - 450 m/min
Feed rate: 0.1 - 0.3 mm per revolution
Material: Tungsten steel (18% tungsten) or carbide
Front rake angle: approx 20°
Clearance angle: 5 - 30°
Note: Planers or dressing machines are commonly used, as in the carpentry industry. Only sharp blades can achieve a smooth surface. Each shaft should have 4 blades.
PE processing
Drilling
Cutting speed: 40 - 70 m/min
Feed rate: 0.1 - 0.3 mm per revolution
Material: Spiral drill, flat drill
Cutting angle: 15 - 25°
Clearance angle: Angle of twist approx. 16°, A = 70 - 90°
Note: Drills/boring and milling machines. Compressed air can be used for cooling. Intermittent drilling creates smoother holes and clears chippings more effectively as well as preventing overheating.
PE processing
Milling
Cutting speed: 200 - 800 m/min
Feed rate: 0.1 - 0.3 mm per revolution
Material: Tungsten steel (18% tungsten) or carbide
Cutting angle: 15 - 25°
Clearance angle: 15 - 25°
Note: Regular milling machines, particularly with high-speed routers. Milling tools with fewer teeth are most effective for clearing chippings.
PE processing
Welding
Due to the melt viscosity, Wefapress St 1000 can only be joined together using friction and butt welding techniques.
Butt welding involves heating the clean welding surfaces to 200 - 220°C under low contact pressure until a layer of around 4mm on each side becomes malleable. Under a contact pressure of 10 - 20 kp/cm², the parts are pressed together until cooled.
If the parts for welding are blocks over 30 mm thick, a contact pressure of 50 kp/cm² or more is required. A press or special welding equipment is often used for this purpose.
