550 Каталог SUMITOMO 2015 Режущий инструмент и инструментальная оснастка Стр.546

Каталог SUMITOMO 2015 Инструмент и оснастка Стр. 546 0550 ENG Lab2u

Technical Guidance TECHNICAL GUIDANCE Basics of Threading Technical Guidance Threading Machining Method Characteristics Radian Infeed A. :; f v,v:. Most common threading technique, used mainly for small pitch threads. Easy to change cutting conditions such as depth of cut, etc. Wears evenly due to equal cut edge on right and left sides, which also translates into a long contact point and thus a tendency to chatter. Difficult to control chip evacuation. Flank Infeed iflv Effective for large pitch threads and blemish-prone work material surfaces. Chips evacuate from one side for good chip control. Heavy flank wear on right side. Corrected Flank Infeed Effective for large pitch threads and blemish-prone work material surfaces. Chips evacuate from one side for good chip control. Reduces flank wear on right side. Alternating Flank Infeed Effective for large pitch threads and blemish-prone work material surfaces. Wears evenly on right and left cut edges. Tendency for chip clogging due to alternating left and right flow. Troubleshooting for Threading Failure Cause Countermeasures Cutting Edge Failure Excessive Cutting Edge Wear Tool material Select a more wear-resistant grade Cutting condition Decrease the cutting speed Optimise coolant flow Review number of passes Uneven Wear on Right and Left Sides Insert attachment Optimise lead angle Attach insert correctly Cutting condition Change to alternating flank infeed Cutting Edge Chipping Cutting condition If caused by a built-up edge, increase cutting speed Cutting Edge Fracture Packing of chips Check coolant supply (excessive coolant to cutting edge) Insert attachment Check insert and/or work material clamping method Shape, Poor Accuracy Poor Surface Roughness Cutting condition Increase cutting speed Tool material (wear) Select a more wear-resistant grade Incorrect lead angle Optimise lead angle Poor Thread Shape Insert attachment Inspect insert attachment Thread depth small Check cutting depth 546