FIT West Corp.
  • Werkzeugkühlung

Skin Freeze Gas-Tempered Tool Inserts

How It Works

WerkzeugkühlungSkin Freeze makes use of refrigeration technology to cool down tool inserts. With additive manufacturing processes, most complex inserts can be produced.  A highly sophisticated duct system in the tool conducts a liquid refrigerant around the wall of the cavity, which has a thickness of only a few millimeters.

The fluid refrigerant enters the defined, open-pored and structured expansion space and vaporizes at once, due to the sudden change of volume behind the cavity wall. Depending on the refrigerant, the cavity wall can be cooled down to -30° C within seconds.

Tool Design

Because of this extremely high energy absorption, which can be up to 20 times higher than with water, the molding compound freezes almost instantly. Ideally, cooling rates of up to 80 K/s are possible. As problem areas such as hotspots immediately cause an increased vaporization and a higher warmth absorption, the refrigerant can cool the tool actively and evenly despite fluctuating cavity wall temperatures. It adapts perfectly to local temperatures.

The Cooling Circuit

Skin Freeze is a closed tempering circuit. Fluid refrigerant is directly injected through inlets into the Skin Freeze tool inserts. Inlet valves, which are directly attached to the tool, provide for an instant and accurate cooling. Due to the heat input from the molding compound, the refrigerant vaporizes within the short time it flows through the tool. Finally, through a second duct system, it is fed back into the cooling aggregate for reprocessing.

skinfreezeThe used refrigerant is the innocuous R404a. As this material causes no kind of deposit within the circuit, regular maintenance as needed with water-based tools is not necessary.

 

 

 

 

Technical Data

Refrigerant

Thermal

Aggregate

Tool

 

In short: Advantages of Skin Freeze

  1. Self-tempering system—hotspots cause greater expansion of the refrigerant, increasing the local heat dissipation
  2. Up to 60% reduction of cycle times, higher discharge rate
  3. Up to 90% lower cooling time has been reached with test tools. Cooling rates of up to 80 K/s are possible.
  4. Low expenditure compared with potential savings with conventional series tool
  5. Closed circuit → environment-friendly, no additional costs
  6. Low maintenance for aggregate
  7. No plugging of duct system as with water cooling
  8. Refrigerant is mixed with oil, which conserves the tool internally—no risk of oxidation
  9. Less distortion of parts
  10. Complex cavity walls can be cooled.
  11. Real, close-to-contour cooling
  12. Skin Freeze can already be used at a wall thickness as low as 3 mm.
  13. Simple handling, inherently stable at up to 1200 bar holding pressure
  14. Low-priced lease of aggregates available with purchase option
  15. Existing inserts can be reconstructed easily and economically to become Skin Freeze-suitable.
  16. Short delivery times thanks to additive manufacturing of tool inserts
  17. CE labeling

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