有许多方法来加工CNC车床零件的内孔和表面, 包括 钻孔, 旋转, 无聊的, 转动, 磨削, broaching, lapping, honing, and rolling.
Applicable Methods for Machining Internal Holes of CNC Lathe Parts
Enlarging (Semi-finishing)
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.
- 厚度: IT11 to IT10
- 表面粗糙度: 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. 钻孔
Drilling a hole in a solid part of a workpiece with a drill is called roughing.
- 厚度: IT13 to IT11
- 表面粗糙度: 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. 铰孔
Reaming is a finishing method for holes following semi-finishing (enlarging or semi-finishing boring).
- 厚度: IT9 to IT6
- 表面粗糙度: 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. 无聊的
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
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- 加工精度: 0.01毫米
- 测试准确性: 0.001毫米
