Comparison of rough and fine boring
Rough Boring and Fine Boring are two types of machining, although the goal is to machine the hole diameter, but their processing purpose, accuracy requirements and application fields are different. Here’s how they compare and differ:
1. Comparison of rough boring and fine boring
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| project | Rough Boring | Fine Boring |
|---|---|---|
| Purpose of | A large amount of material is removed and the pore size | Improve the dimensional accuracy and surface finish of the holes |
| Precision | Medium accuracy, typically in the IT9-IT10 class | High accuracy, typically in the IT6-IT7 class or higher |
| Surface roughness | Coarse, Ra values typically range from 1.6–3.2 μm | Smooth, Ra values typically range from 0.4–1.6 μm |
| Tool characteristics | Use more durable tools (carbide, indexable inserts). | High-precision tools (diamond bits, carbide trimmer knives) are used |
| Processing speed | Quickly remove material with high | The speed is slower and the feed is smaller |
| Main processing parameters | High depth of cut, low feed | Low depth of cut, high feed |
| Processing needs | Reserve an appropriate allowance for subsequent finishing | Final dimensions are met |
2. Application Industries and Examples
1. Rough Boring
- Application Industries :
- Automotive industry: e.g. preliminary machining holes in engine blocks.
- Heavy machinery: such as preliminary machining of excavator arm shaft holes.
- Iron and steel industry: e.g. initial hole machining of large forgings and castings.
- Examples:
- Preliminary hole machining of engine cylinders, removal of casting surfaces.
- Internal bore machining of construction machinery parts, such as hydraulic cylinder liners.
2. Fine Boring
- Application Industries :
- Aerospace: machining of high-precision parts, such as landing gear bore.
- Electronics industry: processing of small precision parts, such as connector holes.
- Mold industry: finishing of mold guide pillar holes.
- Examples:
- Precision internal hole machining of aircraft engine housings.
- Guide bushing hole processing of precision molds.
Double-end boring machine made in the future
- In the automobile, motorcycle, and bicycle industries, he is responsible for the internal hole machining of key parts to ensure high-precision and high-stability assembly results.
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motorcycle frames
sports equipment, and bottom brackets
