Creo Blend

[Karmen Mcarthun]

Iam trying to construct geometries for different wing configurations using swept blend on a defined trajectory. While this method works for some of the wing configurations I have, for some of the designs ( file attached herewith ), after 24 odd sections, the adding 25th section along the span causes a failed regenration. All the wing sections exactly the same ( rectangular wing ).

One of the problems with sweep in general is loosing its path. If the path has choices or crosses, it may be toggling end for end and choosing different paths (learned this a while back and continues to plague me in Creo 3).

These are bugs that get very little attention at PTC unless you can show it consistently failing. And even then, it may be a core Creo issue that "can't be touched" and will never be corrected due to the limited use-case or the risk of breaking other things.

Blend Feature in Creo Parametric is feature in which you can create a part with variable cross sections. these cross-section can be of same type or of different types. in extrude feature and revolve feature you can create part with constant cross section.

For example, in circle there is only one sketching entity while in square there are four lines, so it contains four entities. To blend in between square and circle, the circle must be divided into four arcs.

after clicking at blend feature icon, the tool will become active and its control/option will appear on the ribbon in Creo Parametric. Here we will discuss these options a little so we can have better understanding of the feature. As you can see in the following figures, the ribbon area is divided into different sections. there are four sections in parallel blend feature while there are five sections in rotational blend.

In extrude feature we can add/remove material in the direction of normal to sketching plane. The same principle applies here. That is, you can create a part with variable cross section, but addition or removal of material will be in the direction of the Normal (of the sketching plane).

In Sketching window, we will create a rectangle as our first section. Do notice an arrow at the top-left corner of the rectangle. This is the start point of blend and Creo Parametric will join start-points of all the sections using a curve. So, you will get a twisted part if starting points of sections are not aligned.

Sketching windows will appear again for second section. So create a square this time as shown in the following figure. You will see previously created rectangle as well for your reference. Do notice the position of arrow on the square.

In sketching window, I created a circle and then divided it into four parts. You create this circle by creating four arcs. Do note the position of the arrow and click at ok button in sketching window.

Rotational blend is like revolve feature but with option to vary the cross sections. Requirements for this blend feature is the same as the requirements of blend feature and revolve feature combined. That is

Here we will create rectangle again but this time we will create it at a side of the vertical axis in sketching plane. so you can see in the following figure, the rectangle is around 100 units away from the vertical axis. Click OK in sketch after creating the sketch.

After providing angle click at sketch button and create a square in sketch as shown in the following figure. Do notice the position of start-point. After completing the sketch click at OK button in sketching window.

In this tutorial, we will learn about the Blend Tool of Creo Parametric by developing a solid named 'Hammer Head'. This Tool is used when we want to create a solid by joining two or more closed profiles.

Another important tool which is used in the modelling of this part is Swept Blend. As we can understand by its name it is a combination of sweep and blend both features. In this feature, multiple closed profiles are joined using trajectory.

In addition to this general part modelling process of creating basic sketches, creating Planes etc. are also discussed.

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