实木家具中的曲线或曲面是怎么加工的?
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哪里有实木家具或板式家具的生产图纸啊?
一般弯出一个弧度常见分为3种!一种较简单的就是用一块大板子,使用带锯、军刀锯切细你要的弧线,然后打磨平整,只是因为是锯下来的,木材文里没有跟着弧度弯曲,载重力不要没那么好,过重时会随木理劈列,家里常见餐桌、椅的腿脚就是这种做法。另一种以木薄片集成成型,薄片厚度约0.5~5mm的都可,先制作公模或公母模,然后层层的上胶叠合弯曲成型。常见的欧洲曲木家具或椅背都是这样做的。第三种加工技术比较麻烦,将整根、片木材泡水or软化剂,经过蒸煮或加热后利用模具加压冷却成型。 参考技术A 曲线有二种加工方法,一种是把木头用蒸汽蒸后,用造型工具弯曲,另一种是用实木用电木铣或雕刻机做曲线。 参考技术B 一种是把木头用蒸汽蒸后,用造型工具弯曲,另一种是用实木用电木铣或雕刻机做曲线。 参考技术C
实木家具中的那些曲线和曲面在制作工厂都是采用机器自动雕刻在上面的。
IfcSurfaceOfRevolution
IfcSurfaceOfRevolution是通过绕轴旋转曲线而得到的曲面。
注:定义根据ISO/CD 10303-42:1992
旋转曲面是将曲线绕轴旋转一整圈而得到的曲面。数据解释如下。
参数化如下,其中曲线具有参数化λ(u):
C = AxisPosition.Location
V = AxisPosition.Z
为了产生一个完整旋转的单值曲面,曲线应确保当以圆柱坐标系表示时,曲线应在以C为中心、V轴为中心的圆柱坐标系(r,φ,z)中表示时,曲线上的两个不同参数点的(r,z) 一。对于旋转曲面,参数范围为0<u<360度。v的参数化范围由参考曲线定义。
注:实体改编自ISO 10303-42中定义的旋转表面。
IFC2x中的历史新实体。
非正式提议:
表面不得自相交
扫掠曲线在其长度的任何有限部分不得与轴线重合。
# | Attribute | Type | Cardinality | Description | C |
---|---|---|---|---|---|
IfcRepresentationItem | |||||
LayerAssignment | IfcPresentationLayerAssignment @AssignedItems |
S[0:1] | Assignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items. | X | |
StyledByItem | IfcStyledItem @Item |
S[0:1] | Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve. | X | |
IfcGeometricRepresentationItem | |||||
IfcSurface | |||||
Dim :=3 |
IfcDimensionCount | [1:1] | The space dimensionality of IfcSurface. It is always a three-dimensional geometric representation item. | X | |
IfcSweptSurface | |||||
1 | SweptCurve | IfcProfileDef | [1:1] | The curve to be swept in defining the surface. The curve is defined as a profile within the position coordinate system. | X |
2 | Position | IfcAxis2Placement3D | [0:1] | Position coordinate system for the swept surface, provided by a profile definition within the XY plane of the Position coordinates. If not provided, the position of the profile being swept is determined by the object coordinate system. In this case, the swept surface is not repositioned. | X |
IfcSurfaceOfRevolution | |||||
3 | AxisPosition | IfcAxis1Placement | [1:1] | A point on the axis of revolution and the direction of the axis of revolution. | X |
AxisLine :=IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcCurve() || IfcLine(AxisPosition.Location, IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcVector(AxisPosition.Z,1.0)) |
IfcLine | [1:1] | The line coinciding with the axis of revolution. | X |
EXPRESS Specification
ENTITY IfcSurfaceOfRevolution
SUBTYPE OF (IfcSweptSurface);
AxisPosition : IfcAxis1Placement;
DERIVE
AxisLine : IfcLine := IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcCurve() || IfcLine(AxisPosition.Location, IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcVector(AxisPosition.Z,1.0));
END_ENTITY;
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