Общий каталог Tungaloy 2020 - 2021 - страница 1669

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Drilling Tools B

Nomenclature for gun drill

Secondary clearance angle C Oil clearance Primary clearance angle 8˚~15˚ Outer cutting angle Inner cutting angle Outer corner Apex point D Chamfer Margin Driver

Tip Shank V-fl ute

Oiling hole Wear surface E (Guide pad) Shank oil hole Troubleshooting i n gun drilling F

ProblemCauseTrigger Clamping the workpiece is unstable.Countermeasure Clamp the workpiece firmly.
The guide bush is apart from the workpiece surface at the entry.Contact the guide bush closely with the workpiece.
MachineThe machine's rapid feed is used.Use cutting feed.
ieceWhipping eff ect occurs.Place a whip guide at the appropriate position.
orkpThe shape of the guide bush is not suitable.Use the guide bush in the shape suitable for the workpiece.
into wThe drill is not set properly.Set the drill with an appropriate torque, hydraulic pressure, etc.
At entryDrillRegrinding is in poor quality.Make sure no damage is left on the drill and that the cutting edge geometry is not changed.
Cutting conditionThe feed (f) is too high.Use low feed.
WorkpieceThe workpiece surface is slanted.Use low feed.
Clamping the workpiece is unstable.Clamp the workpiece firmly.
g of drill gMachineThe shape of the guide bush is not suitable.Modify the shape of the guide bush. See “Chip packing” for the details.
akin rillinThe feed speed (Vf) varies.Use mechanical feed.
Bre g dThe number of revolutions varies (decreases).Increase the machine power or adjust the cutting conditions.
urinDrillAbnormal damage occurs.See “Short tool life” for the details.
DCutting conditionThe feed (f) is not suitable.Use an appropriate feed.
WorkpieceInterrupted or cross drilling is required.Change the tool to a standard gundrill.
OthersChip packing occurs.See “Chip packing” for the details.
eceThe tip is too long.Make the tip length short.
workpiDrillThe selection of the guide pads is not suitable.Use 2 guide pads instead of 3.
fromThe clearance of the coolant hole is too large.Reduce the clearance of the coolant hole.
exitCutting conditionThe feed (f) is too high.Use low feed.
AtWorkpieceThe workpiece surface is slanted.Use low feed.
g ingMachineClamping the workpiece is unstable.Clamp the workpiece firmly.
Durin retractCutting conditionBurnishing torque (cutting power) is increased due to reduced hole diameter.Reduce cutting speed (Vc).