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Surface finish - goal: Ideal roughness values and near-netshape dimensions
16.10.2009
However, many factors influence the surface finish of a milled component.
- component geometry, material
- rigidity of the clamping and the machine itself
- tool-overhang and operating data values
- accuracy, geometry and performance of tooling
| Besides these above mentioned items, your requested surface-roughness Rth is influencing the surface finish as well as machining times needed for finishing significantly. Through the conscious selection of operation data parameters in order to achieve a well defined roughness value, competitive machining times are secured. |
Machining example:
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| Material: |
1.2312, SK50 machine
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Surface to be machined: 150 x 200 mm
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| Milling cutter: |
08 214 with d1 = 8, z = 2 |
| n: |
14000 rpm
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| vc: |
350 m/min |
You can roughly say that:
- Doubling either your width of cut or your feed rate reduces your machining time by 50%.
This means for fz = ae:
- doubling both of these values reduces machining time to one quarter.
- however, reducing fz and ae by 50% increases surface smoothness by 4 times.
Selecting identical values for fz and ae produces a very smooth surface in most cases, which is notable for its symmetrical surface finish in feed motion and feed direction.
For further Information, please download our brochure: surface finish
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