Application problems and measures. brass turned parts
one
Drill tip wear
the reason:
1. The workpiece will move downwards under the action of the drill’s drill-in force, and the drill will rebound after drilling.
2. Machine rigidity is insufficient.
3. The drill bit material is not strong enough.
4. The bit jumps too much.
5. Clamping rigidity is not enough, the drill bit slips. brass turned parts
Measures:
1. Reduce 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 if the back corner is reasonable. brass turned parts
two
Ligament collapse
the reason:
1. The workpiece will move downwards under the action of the drill’s drill-in force, and the drill will rebound after drilling.
2. Machine rigidity is insufficient.
3. The drill bit material is not strong enough.
4. The bit jumps too much.
5. Clamping rigidity is not enough, the drill bit slips. brass turned parts
Measures:
1. Use a larger drill bit for the back cone.
2. Check spindle bit runout (<0.02mm)
3. Drill the hole with a predetermined heart.
4. Use a more rigid bit, hydraulic chuck with a constricting neck or thermal shrink fitting.
three
Accumulated tumor
the reason:
1. Chemical reaction between cutting material and workpiece material (low carbon steel with high carbon content) brass turned parts
Measures:
1. Improve lubricants, increase oil or additive content.
2. Improve cutting speed, reduce feed rate and reduce contact time.
3. If drilling aluminum, use surface-polished and uncoated drills. brass turned parts
four
Broken knife
the reason:
1. The drilled spiral groove is blocked by cutting and no cuttings are discharged in time.
2. When the hole is drilled quickly, there is no reduction in feed or change to manual feed.
3. When drilling a soft metal such as brass, the back angle of the bit is too large, and the front corner is not repaired until the bit is automatically rotated.
4. The sharpening of the drill edge is too sharp, resulting in chipping and failure to retract quickly. brass turned parts
Measures:
1. Reduce the cycle time for tool change.
2. Improve the installation of fixed, such as increasing the support area, increase clamping force.
3. Check spindle bearing and slide groove.
4. Use high-precision tool holders, such as hydraulic tool holders. brass turned parts
5. Use tougher materials.
Source: Mechanical Professor
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