What should I do if the drill always breaks during processing?
What should I do if the drill always breaks during processing?
Application problems and measures
1. Drill tip abrasion
the reason:
1. The workpiece will move down under the action of the drill bit's penetration force, and the drill will bounce back after drilling through.
2.Insufficient machine rigidity.
3. The drill material is not strong enough.
4. The drill bit jumps too much.
5. The clamping rigidity is not enough and the drill bit slips.
Measures:
1.Reduce the cutting speed.
2. Increase the feed
3. Adjust the cooling direction (internal cooling)
4. Add a chamfer
5.Check and adjust the coaxiality of the drill bit.
6.Check whether the rear angle is reasonable.
Two, ligament collapse
the reason:
1. The workpiece will move down under the action of the drill bit's penetration force, and the drill will bounce back after drilling through.
2.The rigidity of the machine tool is insufficient.
3. The drill material is not strong enough.
4. The drill bit jumps too much.
5. The clamping rigidity is not enough and the drill bit slips.
Measures:
1.Choose a drill with a larger back cone.
2. Check the beating range of the spindle drill bit (＜0.02mm)
3. Use a pre-center drill to make the top hole.
4. Use a more rigid drill bit, a hydraulic chuck with a neck sleeve or a heat shrink kit.
3. Accumulated tumor
the reason:
1. It is caused by the chemical reaction between the cutting material and the workpiece material (low carbon steel with higher carbon content)
Measures:
1. Improve lubricant, increase oil or additive content.
2. Increase the cutting speed, reduce the feed rate and reduce the contact time.
3. If you are drilling aluminum, you can use a polished and uncoated drill bit.
Four, broken knife
the reason:
1. The spiral groove of the drill is blocked by cutting, and the cutting is not discharged in time.
2. When the hole is fast drilling, the feed amount is not reduced or the maneuvering is changed to manual feed.
3. When drilling soft metals such as brass, the back angle of the drill bit is too large, and the front angl
