It helps in JET ENGINE paper (Specific paper) of DGCA exams.
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berikut adalah pengertian dari pompa jet dan peinsip kerjanya.Deskripsi lengkap
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Jet cooling Presentation
Presentation : During the cooling phase, the thermal energy contained inside the metal is transferred to the Die through the contact between the die and the metal, as well as through the pins cooling canals. Precision of the cooling zones as well as the cooling efficiency are essential for the casting quality. A precise thermal regulation of the Die and its elements allows an optimal casting quality, and solves recurrent metallurgical problems.
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Presentation : Thermal exchanges between metal and the Die during the solidification phase are directly influenced by certain parameters. Lifetime of the Die elements, casting quality, as well as process productivity, are all being determined by these parameters.
The use of Jet Cooling is the most effective solution to cool small diameter pins with precision, thus to control material quality problems such as shrinkage and porosity.
Jet Cooling’s main objective is to master and control the heat transfer in the smallest parts of the Die during the aluminium solidification phase.
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General description :
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Pin characteristics: Range : -Pins diameter : minimum diameter of 4mm -Cooling from a drilling diameter of 2mm -Maximum length of the drilling: 200mm (for a drilling diameter of 2mm)
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Pin characteristics:
Standard pin
Pin with a 2mm diameter drilling
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Jet coolers characteristics:
-Jet cooler internal tube : from 1.2/0.85mm to 2.8/2.3mm -Jet cooler watertightness at 20 bar : using o’ring or threading
The use of Jet cooling in these shrinkage cases allows to maintain a relatively low temperature, thus avoiding any overheating of the pins. The lifetime of these pins which are subject to high thermal constraints is easily multiplied by 5.
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Jet Cooling goals: -Improving the castings’ metallurgical quality : decrease of porosity
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Jet Cooling Goals:
Without Jet cooling
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With Jet cooling
Jet Cooling Goals: – Increasing the pins lifetime: • Average increase : x3 to x5
– Cooling optimization : • Spray cooling decrease • Spray cooling zones optimization • Decrease of the cycle duration
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Applications : Exemple 1 : Gear box carter
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Microscopic inspection is done on the slice ‘A’, with and without the use of Jet Cooling. We can notice smaller-sized grains when using Jet Cooling, thanks to an accelerated solidification phase.
Applications :
The use of thermal cameras allow us to point out the eiffiency of the cooling on the pins A and B. These pictures are taken before the spray-cooling phase. The consequence is a 150°C saving on the pins. Furthermore, all the zone around the pins equipped with Jet Cooling also benefits from the cooling impact. This impact is of 70°C. In this example, the cooling time lasts 10 to 15 seconds.
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Applications : Exemple 2 : Clutch carter
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Applications : Temperature measurement on the pins equipped with Jet Cooling and before the spray-cooling phase: °C
Cooling time in seconds
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Applications : – Results : • Reduction of the cycle duration as well as the spray-cooling phase duration • Improved castings quality • Increase of the pins lifetime • Decrease of shrinkages and porosities
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View of the Dies equipped with jet coolers :
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Ahresty Techno Service Co
Jet cool machine M serie:
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4 types of cooling capacities : 20pcs, 40pcs, 60pcs, 100pcs of jet coolers
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Pressure max 20 bar
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Flow : max 121 L/min
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Cooling circuits : 6 max
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Max number of jet coolers : 100
Jet Cooling machine HDK4: • HDK 4-20 system :
- Pressure : 20 bar - Flow : 20 L/min - Cooling circuits : 4 - Water tank : 60L -Max number of jet coolers : 20
-Advantages : - Closed water circuit - Pin breakage control
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