Il existe de nombreuses méthodes pour usiner les trous internes et les surfaces des pièces de tour CNC., y compris forage, alésage, ennuyeux, tournant, affûtage, broaching, lapping, honing, and rolling.
Applicable Methods for Machining Internal Holes of CNC Lathe Parts
Enlarging (Semi-finition)
Enlarging is the process of further processing an already drilled hole using an enlarging drill to increase the diameter, improve accuracy, and reduce surface roughness.
- Tolérance: IT11 to IT10
- Surface roughness: Ra12.5 to 6.3μm
It is considered a semi-finishing method for holes and is often used as a pre-processing step before reaming. It can also be used as a final finish for holes with low precision.
1. Forage
Drilling a hole in a solid part of a workpiece with a drill is called roughing.
- Tolérance: IT13 to IT11
- Surface roughness: Ra50 to 12.5μm
This is because twist drills are long, have small core diameters, and lack rigidity, and are also affected by the chisel edge.
2. Reaming
Reaming is a finishing method for holes following semi-finishing (enlarging or semi-finishing boring).
- Tolérance: IT9 to IT6
- Surface roughness: Ra3.2 to 0.8μm (special cases up to Ra0.4–0.2μm)
There are two methods for reaming:
- Machine reaming: performed on a machine tool
- Manual reaming: performed manually
3. Hole Turning
Hole turning on a lathe involves rotating the workpiece while the tool moves.
- The hole size can be controlled by the tool’s depth of cut and number of passes.
- Mainly used for producing holes in components such as discs and small brackets.
4. Ennuyeux
Boring involves further processing a drilled, cast, or forged hole using a boring tool. This can be performed on a lathe, boring machine, or milling machine.
Types of boring:
- Rough boring: Tolerance IT13–IT12, Ra12.5–6.3μm
- Semi-finishing boring: Tolerance IT10–IT9, Ra6.3–3.2μm
- Finishing boring: Tolerance IT8–IT7, Ra1.6–0.8μm
About RapidEfficient
RapidEfficient specializes in high-precision CNC machining with 18 années d'expérience.
Its products cover:
- Médical
- Communications
- Optics
- Drones
- Intelligent robots
- Automobile
- Office automation parts
The company’s CNC machining centers include four-axis, machines-outils à cinq axes et à liaison, and are equipped with precision projectors, Machines de mesure à trois coordonnées, spectromètres et autres équipements de test de précision.
- Précision d'usinage: 0.01MM
- Exactitude des tests: 0.001MM
