Общий каталог Ingersoll 2011 - страница 1349

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GENERAL TECHNICAL INFORMATION PARTING AND GROOVING PRACTICAL TROUBLE SHOOTING 1. TO REDUCE BURR • On CNC reduce feed by 75% when approaching center stub diameters ≈ WOC Stub Dia. • Check center height of cutting edge • Use insert with lead angle • If 0° lead angle must be used for whatever reason, apply narrow WOC • Apply a supporting part-catcher (or adjust concentricity) • For hollow bars, it is better to machine chamfers using ID boring tool prior to parting operation. (See picture) 2. TO IMPROVE SURFACE FINISH 1 • Increase cutting speed • Use neutral inserts 2 • Select chipformer that provides optimum chip control • Use coated carbide • Improve coolant application • Eliminate chatter 3. TO IMPROVE FLATNESS • Check inserts and replace any that show wear. • Use neutral inserts • Use largest blade possible, i.e. TGB 32- instead of TGB 26- • Increase blade thickness and insert width • Minimize blade overhang • Check alignment and perpendicularity of tool to machine axis • Optimize workpiece chucking • Lock the carriage on manually operated lathes • Apply coolant abundantly (excluding Ceramic AB30) • Reduce feed 4. TO IMPROVE CHIP CONTROL • Replace worn inserts • Choose a more appropriate chipbreaker • Use a neutral insert • Check alignment and perpendicularity of tool to machine axis • Apply coolant abundantly • Increase feed • At initial groove depth, interrupt feed momentarily to let the chip enter slot 1351