Moldflow

TUTORIAL [Single Cavity

TUTORIAL [Single Cavity]

Introduction:

This tutorial shows you how to create a runner system for a single cavity in a 3-plate mold.

Task List

1.     Set up the model

2.     Set the parting plane

3.     Set mold dimensions

4.     Set runner system parameters

5.     Set the sprue location

6.     Generate drops

7.     Generate horizontal runners

8.     Run an analysis and optimize the sprue

9.     Tutorial overview

Task 1: Set up the model

In this task you will prepare the model for analysis. You will:

Open a model.

Set the polymer injection locations.

Select a polymer material and supplier.

Before you start, set the units to metric so the dimensions will be shown in millimeters. How To?

1.     Click (File Open) and select the desktidy (*.adv) model ( D:\Program Files\Moldflow\Plastics Advisers 7.3\tutorial ).

2.     Click Open to continue.

3.           Click (Adviser Pick Injection Locations) and set the polymer injections location on the underside of the model, as shown in the image below.

4.     Ensure they are positioned at X=137.2, Y=60, Z=-15.69 and X=137.2, Y=-60, Z=-15.69. How to?

5.     Click (Adviser Analysis Wizard).

6.     Select Plastic Filling.

7.     Select the Prepare processing conditions only check box.

8.     Click Next twice.

9.     In the Select Material page of the wizard, click Specific Material, and then select the following from the drop-down lists:

·         Manufacturer: Millenium Petrochemical Inc

·         Trade name: Petrothene GA584-000

10. Click Finish.

11. Click OK to continue.

12. Save the model as desktidy1 in the tutorial directory.

You have completed this task. Move on to the next task: Set the parting plane.

Task 2: Set the parting plane

In this task you will orient the model and set the parting plane.

1.     In the Analysis Mode drop-down list , change the analysis mode to Single Cavity. How To?

2.     If the bounding box is not visible, click (Display Bounding Box) to see the injection side.

3.     Click (Display Rotate), or use the shortcut Alt + S, and rotate the model so it looks like this:

4.     Click (Display Select) and click on the model.

5.     Click (Adviser Modeling Tools).

6.     Choose Rotate from the left-hand panel.

7.     Enter 180 in the X box, and click OK.
The model is rotated 180 degrees about the X axis. The injection locations are now on the top of the cavity.

8.     Click (Adviser Mold and Runner System Tools Parting Plane) to create the parting plane.

9.     Click the Top button in the Set Parting Plane dialog to move the parting plane to the top of the model.

10. Change the Z value to -10.

11. Click OK.

The parting plane is the plane between the A-plate and B-plate. It is always parallel to the x-y plane, and the sprue location is always on the positive z side of the parting plane. This means that you need to have the model oriented correctly before you create the mold or feed system.

Check your understanding

The image below is part of the Cavity Tools, Rotate dialog. Click the +90 next to the X twice to see how the model should be oriented.

You have completed this task. Move on to the next task: Set mold dimensions.

Task 3: Set mold dimensions

In this task you will set the dimensions of the mold.

This cavity has two injection locations on the top of the mold, so it needs a 3-plate mold to accommodate the runner system. You will now set the plate thicknesses, and the mold length and width.

1.     Click (Adviser Mold and Runner System Tools Mold Properties) to open the Mold Properties dialog.

2.     Select the Floating (3 Plate) check box.

3.     Enter these plate thicknesses:

·         A-plate: 50 mm

·         Floating (3 plate): 50 mm

·         B-plate: 80 mm

4.     Set the length and width of the mold:

·         X: 200 mm

·         Y: 300 mm

5.     Click OK.

You have completed this task. Move on to the next task: Set runner system parameters.

Task 4: Set runner system parameters

In this task you will set the default runner system dimensions for the model. You can find explanations for the Runner System in the Glossary. More?

1.     Click (Adviser Mold and Runner System Tools Runner System Defaults) to open the Runner System Defaults dialog.

2.     To set the runner defaults, click the Runners tab, and make these selections:

·         Runner type: Cold Runner.

·         Runner shape: (tapered).

·         Start diameter (1): 4 mm.

·         End diameter (2): 5 mm.

3.     Click the Gates tab, and make these selections:

·         Gate shape: (sub) .

·         Start diameter (1): 3 mm.

·         End diameter (2): 1.5 mm.

4.     In the Gate length and rotation section, select:

·         Set Vertical Gate.

5.     Click the Sprue tab, and make these selections:

·         Sprue type: Cold Sprue.

·         Sprue shape: (round).

·         Diameter (1): 5 mm.

6.     Click OK.

Note: Any feed system sections you create after changing the runner system defaults will have the new dimensions. Sections already created do not change.

You have completed this task. Move on to the next task: Set sprue location.

Task 5: Set the sprue location

In this task you will create the sprue and gates.

The sprue location is the place that the plastic enters the mold. It is always on the top of the mold (the positive z direction from the x-y plane).

1.     Click (Adviser Mold and Runner System Tools Drop Point) to open the Define Sprue Location dialog.
The model will rotate to the top view.

2.     Click Middle of Mold to create the sprue in the center of the mold.

3.     Click OK.

4.     In the Runner Generation dialog, select the Generate Spue And Gates option.

5.     Click OK.

You have completed this task. Move on to the next task: Generate drops.

Task 6: Generate drops

In this task you will create the runners that drop from one parting plane to the other. In a 3-plate mold, the drops connect the gates to the other parting plane.

1.     Click (Display Rotate) to rotate the model so you can see the injection cones.

2.     Click (Display Visible Entities Injection Cones) to hide the injection cones, so you can see the gates.

3.     Click (Display Visible Entities Mold Outline) to hide the mold, so that you can see the cavity clearly.

4.     Click (Display Banding Zoom) and zoom in on the area of the sprue and gates.

5.     Click (Adviser Mold and Runner System Tools Design Runners) to start the runner generation mode. The pointer changes to a .

6.     Position the over the top of a gate, and click when a square appears.

7.     In the Runner Creation dialog, click Create Drop.

8.     Repeats step 6-7 to create the drop for the other gate.

9.     Click OK.

When you click (Design Runner), the modeling grid appears. When you move the cursor over one of the gates, a square appears, indicating where the runner will start if you click the mouse on that gate.

You have completed this task. Move on to the next task: Generating horizontal runners.

Task 7: Generate horizontal runners

In this task you will generate the horizontal runners that connect the drops to the sprue.

For this mold, the cross-section of the horizontal runners is different from the cross-section of the drops.

1.     Click (Adviser Mold and Runner System Tools Runner System Defaults).

2.     Click the Runners tab.

3.     Click (trapezoid).

4.     Make these selections:

·         Width (1): 4.3 mm

·         Thickness (2): 5.0 mm

·         Angle: 7.5 degrees

5.     Click OK.

6.     Zoom out and rotate the model so that it looks like the image below.

7.     Create the horizontal runner:

.      Click (Adviser Mold and Runner System Tools Design Runners).

a.     Move the cursor to the top of the rightmost vertical runner.

b.     When the box appears, click the top of the runner.

c.     Move the cursor to the bottom of the sprue, and click when the box appears.

d.     Click on the top of the other vertical runner.

e.     Click OK on the Runner Creation dialog.

8.     Save the model.

You have completed this task. Move on to the next task: Tutorial Overview.

Task 8: Run an analysis and optimize the sprue

In this task you will run a filling analysis, then optimize a section of the runner system.

1.     Click (Adviser Analysis Wizard), and select Plastic Filling.

2.     Click Finish to launch the analysis.

3.     Click Close when the Results Summary dialog opens.
You have now successfully run an analysis on a model with a manually created runner system. You will now optimize the sprue.

4.     Click (Display Banding Zoom) and zoom in on the sprue.

5.     Click (Display Select) and click on the sprue.

6.     Right-click and select Properties.

7.     In the Sprue Properties dialog, select the Automatically size sprue check box.

8.     Click the Size/Balance Constraints button.

9.     In the Diameter (1) section, select the Free option.
Selecting Automatically size sprue allows the program to calculate the minimum sprue size required to fill the cavity. By selecting Free in the Automatic Size/Balance Constraints dialog, the program tries to optimize the sprue without any limitations.

10. Click OK, then OK again. Note that by changing the properties of your sprue, you have invalidated your results, and need to run the analysis again.

11. Click NO to continue.

12. Click (Adviser Analysis Wizard), and select Plastic Filling.

Note: When you select the Plastic Filling analysis, the Runner Adviser analysis is also selected. This is due to step 7 above.

13. Click Finish.

14. On completion of the analysis, from the left-hand panel of the Result Summary dialog select Runner Adviser.
Here you will see the results of the runner optimization.

15. Click the Review Changes button.
You can see from the details that the program has optimized the sprue diameter.

16. Click Cancel, and then Close.

You have successfully performed a filling analysis and optimized the sprue. Moldflow Plastics Advisers allow you to optimize your sprue, runners and gates.

The above example showed you had to optimize the sprue. To optimize any section of the runner system, follow steps 6-9, but first select the part of the runner system you want to optimize.

Tip: You can also set the Automatically Size feature in the Runner System Defaults dialog.

You have completed this task. Move on to the next task: Tutorial Overview.

Task 9: Tutorial overview

In this tutorial you created a runner system for a single cavity. After completing this tutorial you should be able to:

Orient a model.

Set a parting plane.

Specify the mold dimensions.

Specify the runner dimensions.

Create a simple runner system.

+ نوشته شده در Mon 1 Oct 2007ساعت 19:3 توسط sohrabi |