Каталог Tungaloy глубокое сверление 1 - страница 54

Vc (m/min)Cutting speed: 110907050 Cutting condition and chip form Chip form in deep hole drilling Chip size optimization Chip form plays a key role in STS (Single tube system) Generally, chip length should be 3 - 4 times its width, and DTS (Double tube system) while large-volume and but tends to be longer with difficult-to-cut materials. In high-pressure coolant do so as well. Because chips that case, chip evacuation will be improved by making are removed through the tube with coolant, proper chip chips thinner, usually by reducing the feed rate. formation is essential for smooth and steady evacuation. Chip form variations according to different cutting speeds and feed rates are shown in Table 1 below. To shorten chip sizes, either decrease the cutting speed or increase the feed rate. Chip formation Chip formation is affected by multiple factors, such as workpiece material, chipbreaker geometry, cutting speed, feed, type of coolant and coolant temperature. Suitable chip formation depends on cutting operation but is controllable by changing the cutting conditions. Central Table 1 Intermediate Peripheral Central Peripheral Intermediate Our in-house test result 0.10 0.15 0.20 Drill diameter: ø30.00 mm Condition Feed: f (mm/rev) Workpiece: Low alloy steel (AISI4340) From left to right in each box the order is central, intermediate and peripheral chip. 054 www.tungaloy.com