bb01ec7f7c
With PR FreeCAD#14460 the "machinability" model was introduced. This commits adds material cards with complete machining model data for various types of woods and engineed wood products. The data comes from the German text book "Zerspanung von Holz und Holzwerkstoffen", ISBN 978-3-446-47769-8, 2. Edition 2023, https://www.hanser-fachbuch.de/fachbuch/artikel/9783446477698 Usage of this data for our purpose is legal as facts are not protected by copyright according to German law.
49 lines
2.5 KiB
Plaintext
49 lines
2.5 KiB
Plaintext
General:
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UUID: "2f241065-8590-46c3-aa6e-02a999739d1a"
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Author: "Jonas Bähr"
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License: "CC-BY-3.0"
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Name: "Particle Board"
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Description: >-
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Particle boards are engineered wood products, composed of wood chips pressed
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together with a resin.
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The surface speeds given here are conservative values and can be increased up
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to 4x on capable machines with sufficiently large tools.
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In addition, the numbers here use the cutting force model from B.Ettelt,
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which is less accurate for smaller chip loads, but has the advantage of being
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compatible with the model from O.Kienzle commonly used for metals.
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Another source of uncertaintly is the unknown base rake angle.
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Then, particle boards can differ significantly in density, chip size and type of
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resin, so the numbers given here can only serve as an initial estimate.
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Source: Zerspanung von Holz und Holzwerkstoffen, https://www.hanser-fachbuch.de/fachbuch/artikel/9783446477698
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Inherits:
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Wood:
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UUID: "1850ac4a-0df2-43cd-9934-e59e95b9526f"
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Models:
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Father:
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UUID: '9cdda8b6-b606-4778-8f13-3934d8668e67'
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Father: "Engineered Wood"
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MaterialStandard:
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UUID: '1e2c0088-904a-4537-925f-64064c07d700'
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KindOfMaterial: "Wood"
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Machinability:
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UUID: '9d81fcb2-bf81-48e3-bb57-d45ecf380096'
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# ISBN 978-3-446-47769-8, 2. Edition 2023, P. 66
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# for contour milling, a wide range from 10m/s to 40m/s (up to 120m/s for HSC)
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# is provided, without differentiation on the cutting material or type of wood.
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# Here we take the lower end, based on the assumption that mainly hobbyists will
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# apply this information. Here, smaller tool diameters are common, thus higher surface
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# speeds are not achievable.
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SurfaceSpeedHSS: '600 m/min'
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SurfaceSpeedCarbide: '600 m/min'
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# ISBN 978-3-446-47769-8, 2. Edition 2023, P. 120 (again citing work from B.Ettelt, 1987)
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# provided is the upper bound of the given range 12..18.
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# Unfortunately, it is unknown with which rake angle the values have been obtained.
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# The choice of 20° is arbitrary and needs revision. It should prevent underestimation
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# of the calculated cutting force when expecting a value normalized for 0°.
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# i.e. 18 / (1 - 20/100) is 22.5
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# NB: Ettelt's model uses 'N/mm^1.5' because it does not normalizes the chip thickness,
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# however, the definition of FC's Machinability-model requires this normalization.
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UnitCuttingForce: '22.5 N/mm^2'
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# Ettelt's model uses the square root of the chip thickness, i.e. an 0.5 as exponent
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ChipThicknessExponent: 0.50
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