Welcome: Guangzhou CN CNC Tools Co., Ltd
   Home  >  BLOGS

News

What should I do if my drill keeps chipping and breaking?

1 Drill tip wear
Causes.
1. The workpiece moves downwards under the drilling force of the drill, and the drill bit springs back after drilling through.
2. Insufficient rigidity of the machine tool.
3. The drill bit material is not strong enough.
4. Drill runout is too large.
5. Insufficient clamping rigidity, the drill bit slips.
 Measures.
1. Reduce the cutting speed.
2. Increase the amount of feed.
3. Adjust the cooling direction (internal cooling).
4. Add a chamfer.
5. Check and adjust the coaxiality of the drill bit.
6. Check that the back angle is reasonable.

Ligament chipping
Causes.
1. The workpiece will move downwards under the drilling force of the drill, and the drill will spring back after drilling through.
2. Insufficient rigidity of the machine tool.
3. The drill bit material is not strong enough.
4. Drill runout is too large.
5. Insufficient clamping rigidity, the drill bit slips.
Measures.
1. Use a drill with a larger back taper.
2. Check the range of runout of the spindle bit (<0.02mm).
3. Use a pre-centre drill for the top hole.
4. Use a more rigid drill, a hydraulic chuck with necking sleeve or heat shrink kit.

3 Chip tumour

Cause. 

Caused by chemical reaction between cutting material and workpiece material (mild steel with high carbon content)


Measures.
1. improve the lubricant, increase the oil or additive content.
2. Increase the cutting speed and reduce the feed rate to reduce the contact time.
3. If drilling aluminium, use a drill with a polished and uncoated surface.

Broken tool
Causes.
1. The spiral groove of the drill is blocked by the cut and the chips are not discharged in time.
2. When the hole is drilled quickly, the feed is not reduced or the motorised feed is changed to manual feed.
3. When drilling a soft metal such as brass, the back angle of the drill bit is too large and the front angle is not resharpened, so that the drill bit spins in automatically.
4. The drill edge is too sharpened, resulting in chipping, and the tool is not retired quickly.
Measures.
1. shorten the cycle of tool replacement.
2. Improve the mounting fixing, e.g. increase the support area and increase the clamping force.
3. Check spindle bearings and sliding grooves.
4. Use high precision toolholders, e.g. hydraulic toolholders.
5. Use tougher materials.

CATEGORIES

CONTACT US

Contact: Jacky Wang

Phone: +86 14714816052

Tel: +86 14714816052

Email: [email protected]

Add: Floor 1, Shixi Industrial area, Canton, Guangdong, China. 510288

Scan the qr codeClose
the qr code