Режущие и зажимные инструменты Hoffmann Group 2026 - страница 859

GBP 57 Thread turning – error analysis and solutions Problem Possible cause Solution Excessively high cutting speed ▶ Lower cutting speed / use coated cutter insert Increased Insufficient cutting depth / too many passes ▶ Increase the cutting depth per pass wear on the flank faces Unsuitable carbide grade ▶ Use a coated carbide grade Insufficient cooling ▶ Increase coolant flow Incorrect pitch angle ▶ Use the correct shim Uneven wear along the cutting edge Incorrect infeed method ▶ Use alternate infeeds Cutting depth too high ▶ Reduce the cutting depth / increase the number of passes Insufficient cooling ▶ Increase coolant flow Extreme plastic Excessively high cutting speed ▶ Reduce cutting speed deformation Unsuitable carbide grade ▶ Use a harder carbide substrate Corner radius too small ▶ Select a larger corner radius Cutting depth too high ▶ Reduce the cutting depth / increase the number of passes Extreme plastic deformation ▶ Reduce cutting speed Fracture of the cutting edge Insufficient cooling ▶ Increase the flow rate and adjust the flow direction Unsuitable carbide grade ▶ Use a tougher carbide substrate General instability ▶ Check/improve the system stability Cutting speed incorrect ▶ Adjust the cutting speed Built-up edge Unsuitable carbide grade ▶ Use a coated carbide grade Point height incorrect ▶ Correct the point height Thread profile too flat Cutter insert does not machine the threaded point ▶ Measuring workpiece diameter Cutter insert is worn ▶ Replace the cutter insert in good time Excessively low cutting speed ▶ Increase cutting speed Poor surface quality Shim incorrect ▶ Use the correct shim Unsuitable infeed method ▶ Use alternate or radial infeed Infeed methods Infeed method Recommended for Advantage ■ Pitches up to 1 mm Radial ■ Easy to use infeed ■ Short-chipping material ■ Cold-formed or hard material ▶ ■ Also on conventional machines 27 ■ Pitches > 1 mm (24 TPI) Flank infeed ■ Trapezoidal thread. ▶ ■ Good chip clearance Modified ■ Pitches > 1 mm (24 TPI) ■ Good chip clearance flank infeed ■ Trapezoidal thread ▶ ■ Reduces forces on the flank side Alternative ■ Cutter inserts with small radii ■ Good chip clearance flank infeed ■ E.g. for NPT thread ▶ ■ Even load/wear on both flanks 859