734 Каталог ISCAR 2017 Вращающийся режущий инструмент и инструментальная оснастка Стр.730

Каталог ISCAR 2017 Ротационный инструмент Стр. 730 0734 ENG Lab2u

TAPS USER GUIDE Troubleshooting Problem Cause Solution Incorrect tap (cutting geometry unsuitable for application) Use tap selected from the relevant material group Faulty alignment Ensure that the tap is correctly aligned with the core hole axis Tapped hole oversized Tap jamming Improve lubrication and direction of coolant Adjust cutting speed Incorrectly reground tap (lead tip is not concentric) Regrind tap Problem Cause Solution Incorrect tap (cutting geometry incorrect for application) Use a tap from the relevant material group Stripped threads Spindle speed and feed rate are not synchronized Check feed rate programming and/or pitch of leading spindle. Use a tapping spindle with axial float (GTI/GTIN) Insufficient starting pressure exerted on tap (causes peeling) Increase starting pressure Problem Cause Solution Bell mouthed tapped hole Incorrect starting pressure Use a tapping spindle with axial float (GTI/GTIN) Problem Cause Solution Incorrect tap (cutting geometry unsuitable for application) Select tap for the relevant material group Unsatisfactory thread surface The tap is blunt Replace or regrind tap finish Tap badly re-ground Regrind tap. Check that cutting geometry is suitable for material Incorrect lubricant, concentration or quantity Ensure the use of a suitable coolant and an ample supply Problem Cause Solution Swarf jamming Check cutting speed. Use alternative tap Tap has jammed against bottom of pre-hole Check hole and thread depths. Drill a deeper pre-hole Partial chipping of tap Tap incorrectly reground (lead-in diameter too short, therefore too few cutting teeth) Ensure that correct dimensions are maintained when regrinding Irregular workpiece material structure Adjust cutting speed. Improve lubricant quality of coolant Problem Cause Solution Incorrect cutting speed Adjust cutting speed to suit workpiece material Excessive tap wear Coolant lacking in lubricating qualities and/or quantity Ensure the use of a suitable coolant and an ample supply. Check that the coolant is reaching the cutting zone Surface of the pre-hole is compacted Check pre-hole drilling conditions (drill carefully to reduce risk of surface compacting). Check drill cutting edges Problem Cause Solution Incorrect tap in use (cutting geometry unsuitable for application) Use tap from the relevant material group Centering error Ensure that axes of tap and pre-hole are aligned Tap breakage Blunt tap regrind tap Tap has reached bottom of pre-hole Use tapping spindle with axial float and slipping clutch (GTI/GTIN) Pre-hole too small Check for correct pre-hole size, see pages 720-721 730 ISCAR