4.2. Check the Tool Mesh and Offset

Files required:

5_4_2_App_MF.zip: Download

Unit System:

  • mm-second-tonne-Newton

Summary:

  1. Check and merge duplicate nodes, tolerance 0.05mm - good for most cases.

  2. Check for normal consistency - all tooling mesh normal should be consistent.

  3. Normal orientation: blank normal up, upper tools normal down, lower tools normal up.

  4. Free edge - use ElEdit to check for free edges. Small gaps mostly okay, big overlaps will be a problem.

  5. Check zero or very small Jocabian for collapsed elements. This messes up the normal determinations for contact. Use 'model check'.

  6. Least amount of work needed for tool mesh if LS-PrePost tool mesher is used.

 

4.2.1. Open the Keyword File

Choose File > New from the menus.

Choose File > Open > LS-DYNA Keyword File from the menus.

Open toolmesh.k file.

 

4.2.2. Check for Duplicate Nodes and Show Free Edges

  1. Click MFPre in the right toolbar.

  2. Click DupNod in the MFPre toolbar to open the Duplicate Nodes dialog.

  3. Activate the Show Free Edges check box.

  4. Click Show Dup Nodes.

  5. Click Merge Dup Nodes.

  6. Click Accept.

 

4.2.3. Tool Mesh Normal Check

Normal orientations: blank normal up, upper tools normal down, lower tools normal up.

  1. Click MFPre in the right toolbar.

  2. Click Normal in the MFPre toolbar to open the Normals dialog.

  3. In the Select Shells dialog, select ByPart.

  4. In the Graphics Window, pick the part.

  5. In the bottom toolbar, click the wireframe display button to show vectors.

 

4.2.4. Reverse Tool Mesh Normals by Part

  1. Click MFPre in the right toolbar.

  2. Click Normal in the MFPre toolbar to open the Normals dialog.

  3. In the Normals dialog, select Reverse Normal.

  4. In the Select Shells dialog, select ByPart.

  5. In the Graphics Window, pick any element on the part.

 

4.2.5. Align Tool Mesh Normals

Reverse a part normal based on one seed element normal.

Auto reverse works within one part boundary.

  1. Click EleTol in the right toolbar.

  2. Click Normal in the element toolbar.

  3. In the dialog, select Align.

  4. In the Select Shells dialog, select ByElem.

  5. Click the . button next to Seed elem..

  6. In the Graphics Window, pick an element that has the Normal you want to reverse.

  7. Click AutoRev.

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4.2.6. Jacobian Check, Delete Failed

Check for zero or very small Jacobian, and delete failed.

  1. Open the Application > Model Checking menu.

  2. Choose Application > Model Checking > General Checking.

  3. In the Model Checking dialog, select the Quality Check Checking Method.

  4. Activate Jacobian.

  5. Set Allowable = 0.05.

  6. Click Delete Failed.

  7. Click Done.

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4.2.7. Jacobian Check, Contour Display

 

4.2.8. Offset with Advanced Option On

  1. Click MFPre in the right toolbar.

  2. Click Offset in the MFPre toolbar to open the Offset dialog.

  3. In the Select Shells dialog, select Visible.

  4. In the Offset dialog, set Offset Distance = 1.2.

  5. Activate Copy Elem.

  6. Activate Advanced.

  7. Click Offset +.

  8. Click Done.