Project Background and Core Process Requirements

In aluminum alloy casting, hydrogen content and non-metallic inclusions directly affect the density and mechanical properties of the castings. WONDERY recently delivered a Fixed Aluminum Liquid Degassing Box equipped with a Crane-Mounted Heating Cover. The client's requirements focused on efficient online hydrogen removal while maintaining flexible thermal compensation to prevent temperature drops or secondary hydrogen absorption during non-degassing phases.

Technical Solutions and Parameterized Evidence

1. Structural Design for Efficient Purification

As a core purification station between the furnace and the casting machine, the degassing box features targeted optimizations:

• Operating Conditions: Designed for molten aluminum temperatures of 720 ℃ – 850 ℃, suitable for pure aluminum, Al-Si, Al-Mg, and other alloys.

• Mode Switching: Used in conjunction with a mobile rotary degasser. During idle periods, the heating cover is hoisted by a gantry crane to switch the box into a constant-temperature preservation mode.

2. Precision Thermal Compensation and Heating Cover Technology

To maintain constant melt temperature, the heating cover integrates a high-performance system:

• Heating Elements: High-resistance alloy wires arranged in a corrugated pattern ensure uniform radiant heating across the melt surface.

• Insulation Performance: The cover interior utilizes Shandong Luyang aluminosilicate fiber modules, pre-compressed to minimize heat loss and prevent surface oxidation.

• Control Accuracy: Equipped with a PID intelligent controller to monitor the cover's thermal field, minimizing temperature fluctuations during holding periods.

3. Stringent Installation and Oven-Drying Standards

To ensure the longevity of the refractory lining, WONDERY implemented a mandatory oven-drying protocol:

• Dehydration: Room temperature to 300 ℃ (2-hour hold) to remove all moisture.

• Stress Relief: 300 ℃ to 500 ℃ (2-hour hold) to release thermal stress in the refractory.

• Operating Readiness: Final ramp to 750 ℃ (2-hour hold), with the heating rate strictly kept at ≤50 ℃/h to prevent cracking.

4. Safety Protection and Mechanical Reliability

• Safety Factor: Lifting lugs are designed to bear ≥1.5 times the weight of the cover, ensuring absolute safety during crane operations.

• Electrical Safety: System insulation resistance is ≥1 MΩ, with reliable grounding and limit switches to prevent accidental collisions during hoisting.

Delivery Specifications and Key Configurations

• System Components: Fixed degassing box, crane-mounted heating cover, and intelligent electrical control cabinet.

• Material Standards: High-grade refractory materials combined with stainless steel framing for superior resistance to molten aluminum erosion.

• Operational Standards: Includes detailed safety protocols, such as mandatory tool preheating and protective gear requirements to prevent molten metal splashes.