J A A P   K L I J N S T R A

+31 (0)20 4864727

Typical problem/solutions

At every stage problems can occur, stay alert!

 

 THE FOUNDRY WAX MODEL

 

Rubber mould:

 

Deformation of the rubber

Missing volumes (air bubbles/ plaster pressure/ key & stability/ pressure while closing)

Extra volumes (air during mixing)

 

First wax coating:

 

Penciling, versus applying

Temperatures (rubber/wax)

Brushes (round or flat, hard or soft)    

 

Wax casting

Temperatures

Timing (thickness)

Manipulation(variation)                                                                                                                                                                                                                            

 

Manipulation while correcting/storing/transport

Temperatures (ambient/fingers)

Surfaces & points of contact/pressure.

 

INVESTMENT MOULDING

               1 Spruiting

  • Vents. (avoid missing parts)

  • Feeders (avoid cold shuts)

  • Venting the core

  • Securing the core

  • Shall I cut my model (why and when) ?

  • Treating volumes (avoiding shrinkage)

  • Casting top down or down up

  • Controlling oxidations & dirt

     

                2 Investment Mould

  • Avoiding ‘potatoes’ (penciling/spaying)

  • Importance of the first layer.

  • Avoiding cracks (flashes) & breaks

  • Form of the mould (round/square)

 

BURNOUT

  • Ovens & Position in the oven

  • Timing

  • Temperatures                                          

 

KILNS & CASTING

 

J A A P   K L I J N S T R A

+31 (0)20 4864727

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