偏移曲線
藉由在周圍面上偏移邊線來建立與延伸和/或分割新的曲線。
偏移曲線藉由偏移周圍面的邊線來建立新的曲線,讓您可建立並控制輪廓而無需使用額外的草圖或特徵。在這個範例中,我們將偏移並分割頂面,然後使用其他曲面工具來加高一個區域,以在製造的過程中套用紋理。
由於偏移與分割是建立在夾具上的,因此如果夾具的輪廓改變,分割的輪廓也會隨之改變。
在特徵工具列中按一下「偏移曲線」,然後在圖形區域中選擇一或多條要偏移的曲線。您可以選擇多條邊線來建立單一連續曲線或多條不相連曲線。
個別的曲線可以在同一面上重疊而不會有任何錯誤,但您不能夠選擇在相同特徵中分支的邊線。
輸入偏移距離並選擇一個偏移類型。「測地線」會使用在目標面 2D 空間中的測地線距離計算偏移。「歐幾里德」使用在 3D 空間中的歐幾里德距離來計算偏移。
如果需要,可將偏移曲線反轉至所選邊線的另一邊。
從下拉清單中選擇間距填補。「線性」會以線性邊填補間距。「圓形」會以與間距填補邊上兩條曲線相切的圓形邊來填補間距。
從下拉清單中選擇一個偏移類型。選擇「偏移和延伸」來將曲線兩端延伸至面的邊上。
核取「修剪」來控制曲線的開始與結束點。輸入值或使用箭頭操控器。「同等修剪」會在修剪的開始與結束邊上同等地修剪。在選取了「同等修剪」的情況下,一個操控器會同時調整開始與結束的相同修剪。
在接受之後,這兩個選項都不會分割任何的面。
「偏移、延伸和分割」會將曲線兩端延伸至面的邊上並在偏移處分割面。這樣不會建立單獨的曲線。
按一下「目標」欄位,然後在圖形區域中選擇一或多個目標面來將曲線限制在這些面上。在接受偏移之後,曲線僅會出現在這些面上。不選擇任何面與選擇模型中所有的面會有一樣的效果。
- Select the Offset curve icon () on the Feature toolbar.
- 在圖形區域中選擇一或多條要偏移的曲線。
- 輸入從原始邊線的偏移距離數值。
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從下拉清單中選擇「偏移類型」:
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測地線 - 使用測地線距離計算偏移。系統會在目標面的 2D 空間計算距離。
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歐幾里德 - 使用歐幾里德距離計算偏移。系統會在 3D 空間中計算距離。
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選擇性地按一下「反轉」箭頭來將偏移曲線反轉到所選邊線的另一邊。
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從下拉清單中選擇「間距填補」:
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線性 - 使用線性邊填補間距。
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圓形 - 使用與間距填補邊上兩條曲線相切的圓形邊來填補間距。
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從下拉清單中選擇下列的「範圍」選項之一:
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偏移 - 將曲線從邊線偏移。
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偏移和延伸 - 將曲線兩端延伸至面的邊上。
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如果選取了「偏移和延伸」,系統會提供「修剪」控制項。核取「修剪」並輸入「開始修剪」與「結束修剪」的數值,或使用開始與結束修剪箭頭操控器來在圖形區域中視覺放置修剪的開始與結束。
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核取「同等修剪」來在修剪的開始與結束邊上同等地修剪。在選取了「同等修剪」的情況下,一個操控器會同時調整開始與結束的相同修剪。
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偏移、延伸和分割 - 偏移並將曲線兩端延伸至面的邊上,同時分割面以建立新的面。使用這個選項時,不會建立新的曲線。
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- Click the Targets field and select one or more target faces in the graphics area to constrain the curve to those faces. If no faces are selected, this is the same as all faces being selected.
- 按一下核取記號來接受新的偏移曲線。
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可以選擇多條邊線來建立連續的曲線:
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偏移曲線可以在相同面上彼此交錯:
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選擇分支的邊線會產生錯誤。系統無法用這些分支的邊線建立偏移曲線:
In addition to the surfacing tools, curves are used to create the basic building blocks of surfaces.
This lists the collection of curve feature tools. This is not an exhaustive list. Additional Feature tools may be used when manipulating curves.
- Sketch tools - Tools in the Sketch toolbar such as Line, Corner rectangle, Center point rectangle, Center point circle, 3 point circle, Tangent arc, 3 point arc, Spline, Point, and Construction used to create a sketch in a Part Studio.
- Helix - Create a helix using a conical or cylindrical face, single axis or z-axis of a mate connector, or circular edge.
- 3D fit spline - Create a 3D fit spline through a series of vertices. Creates a curve which is listed in the Parts list under Curves.
- Projected curve - Create a curve from the projection of two sketches (Two sketches option) or from the projection of a curve on a face (Curve to face option).
- Bridging curve - Create a Curve connecting any two points, vertices, or Mate connectors. The resulting Curve is listed in the Feature list and the Parts list.
- Composite curve - Represent multiple edges as one Curve. Select multiple adjacent edges, sketch entities, and other curves. Selecting non-contiguous edges may result in multiple Curves created. Selections for each Curve must meet at their vertices. (Curves are listed in the Parts > Curves list.)
- Intersection curve - Create a curve at the intersection of two or more surfaces or faces. The selections must intersect.
- Trim curve - Trim or extend a curve by a distance or to a bounding entity.
- Isocline - Create an isocline on a sloped face. An isocline runs on a face at positions where the face has a certain slope compared to its reference definition. The resulting isocline is listed in the Feature list and Parts list.
- Offset curve - Create and extend and/or split a new curve by offsetting edges on surrounding faces.
- Isoparametric curve - Create smooth curves that run along a face or surface in the U or V direction.
- Edit curve - Edit an existing curve by selecting sketch entities or curves to apply a simplified approximation, elevate the degree, reposition control curve vertices and/or planarize into any 2D plane.
iOS and Android support for the Offset curve feature is limited to displaying and editing existing curves. Offset curves can only be created on the desktop (browser) platform. They cannot be created on iOS or Android platforms.