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Mold Tools · Lesson 2: Define the parting line

Scaling for shrinkage, automatic or manual parting line, splitting straddle faces.

Lesson goal

Get a closed parting line that cleanly separates the core faces from the cavity faces.

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2 videos

✎

1 exercise

Intermediate

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Prerequisite: Lesson 1

1. Watch the videos

Dassault Systèmes videos hosted on MySolidWorks: they open in a new tab and a free account is enough. Watch them in order.

Parting LinesVideo 1▶Parting LinesScaling for shrinkage, then a parting line selected automatically or by hand.↗ Splitting a Straddle FaceVideo 2▶Splitting a Straddle FacePlace the parting line in the right spot and split the face with the Split Line tool.↗

2. Key takeaways

1

Scaling compensates for material shrinkage: it is done before the parting line.

2

The Parting Line borders the core and cavity faces; on simple parts it is often found automatically.

3

A straddle face belongs to both sides of the mold: split it with a Split Line before creating the parting line.

4

The parting line position leaves a visible mark on the part: place it on an inconspicuous edge whenever possible.

Tip

Rerun Draft Analysis after splitting a straddle face: each new face must be entirely positive or entirely negative.

3. Do the exercise

Take the part from lesson 1:

  • apply a scale that matches the shrinkage of the chosen material
  • split a straddle face with a split line
  • create the parting line
✓To check: The parting line forms a closed loop and the PropertyManager shows that it is complete.

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