DM-Intro 14.5 WS-05e Applications Pulley

2012 ANSYS, Inc. November 20, 2012 1 Release 14.5

14. 5 Release

Introduction to ANSYS DesignModeler

Workshop 5e Applications - Pulley


Introduction

Background

This workshop will demonstrate the parameterization of a mechanical pulley.

Objectives

Creating a Workbench project Model Creation

Sketching & Modeling Operations

Using a Construction Sketch

Parameterization of the Model Creating Parameters

Using the Parameter Manager


Project Startup

Create the Project

Start Workbench. Start All Programs ANSYS

14.5 Workbench 14.5

Expand Component Systems and drag and drop a Geometry component system into the Project Schematic.

Double click on the Geometry cell (A2) to start DesignModeler.


Starting the DesignModeler Session

Set Units

In the Units specification box select Millimetre.

Click OK.


Sketch Creation

Create a Sketch

In the Tree Outline, select the XY Plane.

Click the Look At button in the toolbar.

Select the Sketching Mode Tab.

This will display the Sketching Toolboxes

Select the Draw Toolbox.


Sketch Creation

Create a Sketch (Continued)

Select the Circle Tool. When any sketching tool is

selected the information bar provides instructions.

1. Move the cursor over the origin until a letter P appears then click once (P is a point constraint).

2. Move the cursor away from the origin to define the radius and click once again.

Dont worry about the exact size, dimensions are added in a separate step.

You can use the Undo button if you make a mistake.

1 2


Sketch Dimensions

Adding Dimensions

Select the Dimensions Toolbox Make sure the General tool is selected.

1. Click once on the circle edge.

2. Move the cursor away and click once again to set the position of the dimension. In the Details View set D1 to 60mm.

1 2


Modeling Operations

Extrude the Sketch

Switch to Modeling Mode using the tab.

Click on Sketch 1 in the Tree Outline and select the Extrude feature from the Create menu.

The Extrude command will be inserted into the Tree Outline.


Modeling Operations

Add a Modeling Feature (Continued)

In the Details View set the extrusion depth to 10mm leaving all other fields set at default values.

Click Generate.

Click the Iso Ball to snap to the isometric view


Sketch on a Face

Click the Look At button to orient the view.

Click the New Sketch button to create a new sketch on the XYPlane.

Enter Sketching Mode using the tab.

In the Draw Toolbox, select Polygon and set n = 5.

Click on the origin then click on the Y-Axis in the approximate position shown. You should see a P point constraint at the origin and a C coincident constraint on the Y-axis when you click each.

Sketching


Dimension the Polygon

Select the General Tool in the Dimensions Toolbox.

Select the top vertex then the X-Axis as shown in the sequence below to create a vertical dimension.

In the Details View set the new vertical dimension (V2) to 20mm.

Dimensioning


Create the Sketch to Define the Holes

Well use the polygon sketch as a construction sketch to help position the holes in a new sketch.

Click the New Sketch button. From the Draw Toolbox, select the Circle Tool. Click on the top vertex of the polygon (make sure you

see the P point constraint) then click again to define the radius approximately as shown.

Draw a second circle on the next polygon vertex to the right, this time when you define the radius move the cursor until you see an R constraint appear this will constrain the new circle to equal the radius of the original circle.

If you did not get the R constraint use Undo to try again or apply the constraint manually using the constraints toolbox.

Sketching


Create the Sketch to Define the Holes

Repeat the same procedure for the remaining three vertex points on the polygon so you have five identical circles as shown.

Sketching


Dimension the Holes

Using the General Tool in the Dimensions Toolbox add a diameter dimension to the top circle.

In the Details View set the new diameter dimension to 5mm.

Check that all five circles update to the new dimension value.

Dimensioning


Extrude to Create Holes

Switch to Modelling Mode. In the Tree Outline, select Sketch3

and select Extrude from the Create menu or Toolbar.

In the Details View set; Operation to Cut Material.

Extent Type to Through All.

Generate.

Modeling Operations


Extrude to Create Holes

The Extrude Operation will cut the holes into the model.

Modeling Operations


Create the Groove Sketch

Switch to Sketching Mode. Select the ZXPlane from the drop

down box, the view will automatically reorient.

From the Draw Toolbox select Rectangle and create a rectangle in the approximate position as shown.

Sketching


Dimension the Sketch

In the Dimensions Toolbox select the General Tool.

Select the Horizontal edge of the rectangle to create a horizontal dimension.

Do the same for the vertical edge to create a vertical dimension.

In the Details View set the new dimensions to 6 & 4mm respectively.

Dimensioning


Dimension the Sketch

Select the Y-Axis then the vertical line nearest the Y-Axis to create the dimension L3 as shown.

Select the X-Axis then the lower edge of the rectangle to create the dimension L4.

Set the values to 2 and 28mm respectively.

Dimensioning


Revolve the Sketch

Switch to Modeling Mode. In the Tree Outline, select Sketch4. Select Revolve from the Create Menu

or Toolbar.

In the Details View activate the Axis selection box, select the X-Axis in the Graphics Window and apply the selection.

Set operation to Cut Material. Generate.

Modeling Operations


View the Completed Geometry

With the pulley model completed as shown here we will now create a parameter for the pulleys diameter and define several expressions to control the pulleys features.

Review


Parameterize the Pulley Diameter

Select Sketch1 in the Tree Outline. In the Details View, check the box

next to the dimension D1.

This promotes the dimension to a parameter.

Enter the name Pulley_Diameter in the dialog box as shown and click OK.

Parameterization


Note: We have now made the pulley diameter a parametric value. Since our goal is to

drive the other dimensions to automatically reflect any diameter change, well now create several expressions for that purpose. In particular, there are 2 dimensions we

need to control, the hole pattern dimension and the pulleys groove radius (see below).

Recall the original dimensions were:

Pulley diameter = 60

Hole pattern = 20

Groove radius = 28

The desired formulae are:

a) Hole pattern placement:

Dimension = (Pulley_Diameter) / 3

b) Pulley groove diameter:

Dimension = (Pulley_Diameter)/2 - 2

Parameterization


Identify Driven Dimensions

The Groove Radius is defined by the dimension L4 on Sketch4 on the ZXPlane.

This is therefore referenced as ZXPlane.L4

Parameterization


Identify Driven Dimensions

The Hole Pattern is defined by the dimension V2 on Sketch2 on the XYPlane.

This is therefore referenced as XYPlane.V2

Parameterization


Create Parametric Functions

Activate the Parameter Manager using the Toolbar button. Click on the Parameter/Dimension Assignments tab to enter equations.

NOTE: Your default parameter names may be different depending on the order and type of Dimensions placed.

The Hole Pattern dimension (XYPlane.V2) needs to be = Pulley_Diameter/3. Type this into the window as shown.

Parameterization



The Groove Radius dimension (ZXPlane.L4) needs to be = Pulley_Diameter/2 - 2. Type this into the window as shown.

Parameterization



Click on the Design Parameters Tab and enter a new value for the Pulley_Diameter (40mm)

Click on the Check Tab to evaluate the functions with the new parameter value.

Check the values are as shown, if not check your parameter/dimension assignments.

Parameterization



The Sketches are updated and are visible in the Graphics Window.

Click Generate to update the model.

Parameterization


Control Parameters from Workbench

From the Workbench Project Schematic double click the Parameter Set box to enter the Workbench Parameter Manager.

You can control the Parameter value from Workbench by entering its required value in the Parameter field.

Set it to 60. Return to the Project schematic.

Parameterization


Control Parameters from Workbench

Right click on the Geometry Cell and select update.

The new parameter value is sent to DesignModeler and the model is updated.

In practice you can create multiple design points using different parameter values and update from Workbench.

DesignModeler will update in the background.

Parameterization


This completes the workshop. From the main menu select File Close DesignModeler

Workbench will save any application data.

From the Workbench Project Page use the file menu and save the project as DMWS5e.wbpj to your working folder.

Saving the Project

DM-Intro 14.5 WS-05e Applications Pulley

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