Каталог Sumitomo сверла и развертки - страница 71

• Recommended Drilling Method (1) Drill a guide hole using the dedicated PHT type D Select the same nominal diameter for the dedicated guide hole drill PHT type as the deep hole drill XHGS type. (The guide drill diameter is designed +0.02 mm to +0.05 mm larger than the long drill diameter)

H = Drill diameter x 1.5 to 2.0 times depth

(2) Feed the deep hole drill XHGS type through the guide hole at low rotation speed D Rotation Speed : 500min-1 D Feed Rate : 1,000 to 2,000mm/min

• If the drill is inserted into the guide hole at the set cutting speed, peripheral run-out may cause shoulder damage to the drill.

Stop 1mm away from the guide hole depth 1

(3) Increase rotation speed until the set cutting speed is reached, and start normal drilling operation

• When using an NC machine, you may be instructed to begin normal drilling operation before the set rotation

Increase rotation speed speed is reached, so it is recommended to enter a dwell instruction before normal drilling operation is instructed.

(4) After drilling, rotation speed is reduced and the drill is retracted from the work material D Rotation Speed : 500min- 1 Feed Rate : 1,000 to 2,000mm/min

• Retracting a drill from the work material at a high rotation speed is dangerous as doing so may result in breakage due to run-out.

Change the rotation speed to 500min -1. (5) Other Notes J D A flat base should be prepared when the entrance point is not a flat surface (such as an inclined or cylindrical surface).

Spot facing using an endmill or flat multidrill MDF type (see page J34)

Solid Concave endmills cannot be used Special D When the exit point is a non-horizontal surface, decrease the feed rate to f=0.05mm/rev just before drilling through to Indexable reduce drill breakage and burrs at the exit point. Reamer Brazed

• Coolant

Others (1) Internal coolant supply D Use JIS A1 class 1 oil or equivalent (emulsion). D Pump pressure Steel: 1.5 to 2.0MPa (Cooling effect increases at higher pressures, affecting chips/wear) Cast Iron & aluminum alloy: 4.0 to 6.0MPa (Priority on cooling) (2) Internal MQL

• Consult the manufacturer before using with aluminum alloy.

(3) Internal dual-liquid mist