Rapid Thermojet Wax Patterns and Moulds for Investment Casting..............
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Centric Associates has been supplying Rapid Protoype waxes for use in Investment Casting for over 13 years.
Rapid Prototyping is essential in today's Just in Time manufacturing environment; parts can be built overnight. These Wax prototypes provide a quick way of evaluating casting before committing to Investment casting tooling or to cater for small batches of Investment Castings production direct from Wax prototypes.
We currently run 7 Thermojet 3D printers, this allows the production of wax models to be expedited by running customers jobs on multiple machines. We can accept customers 3D CAD models in a variety of popular formats.
                                        

  • THERMOJET WAX BUILD MATERIAL
The material we use in our Thermojet printers to produce the wax patterns is 3D Systems TJ88.
This material is ideal for investment casting as leaves only 0.01% of ash following being burnt of the the investment casting shell.




     

    Material Properties Relating To Investment Casting:

    • Melt temperatue: Approx 85-95°C
    • Softening temperature Approx 70°C
    • Density (g/cubic cm) @140°C = 0.846
    • Density (g/cubic cm) @130°C = 0.848
    • Density (g/cubic cm) @ 23 °C = 0.975
    • Volume shrinkage from 140°C to room temperature = 12.9%
    • Linear shrinkage from 140°C to room temperature = N.A.
    • Ash content  TJ88 Gray 0.00 - 0.01%


      

    X

    Left/Right

    Y

    In/Out

    Z


    Up/Down

    Max Print Size  

    250

    190

    200

    Resolution (DPI)

    400

    300

    600

    Resolution (mm)

    0.064

    0.085

    0.042

    Resolution (um)

    64

    85

    42

     

    • Thermojet Material 

    TJ88. Known as a wax co-polymer, it is essentially a modified wax with a melting point around 85oC. High cleanliness is required to ensure the fine jets are not blocked. 

    • Build Speed  

    As the part builds in height (Z direction), the Thermojet is printing 600 layers per inch (24 layers per mm). Each layer requires several passes because the head works in multiple scans to increase the Y resolution. (Representing the distance between holes). The build speed is increased if the job is short along the X axis, making the passes quicker. 

    Build Speed (mm/hr)

    8mm/hr(full)

    15mm/hr(small)

    Build Speed (hrs/cm)

    1.25hrs/cm(full)

    40mins/cm(small)