Aluminum Quenching Furnace

Danyang Dingfeng Industrial Furnace Co., Ltd. is one of the most reliable manufacturers and suppliers of aluminum quenching furnace in China. If you're going to wholesale durable aluminum quenching furnace made in China, welcome to get pricelist from our factory. All customized products are with high quality and low price.

Product Definition

 

An aluminum quenching furnace – we call it a solution annealing furnace sometimes. What it does: heat aluminum workpieces to a specific temperature so the alloying elements dissolve into the solid solution, then quench it fast to lock that structure in. That's how you get maximum strength and hardness out of heat treatable aluminum alloys like 6061, 7075, or A356.

Working Principle

 

Let me walk you through how this thing runs.

• Loading. Put your aluminum parts into the furnace chamber. Or if it's a melting version, into the crucible. We build both.
• Heating. Electric elements or gas burners – depends what you ordered. Heat goes up.
• Temperature control. A controller follows your curve. PID or PLC, depends how fancy you want.
• For melting: you go above the melting point. Aluminum melts around 660°C, but you typically run melting furnaces at 720°C to 760°C for good fluidity.
• For solution treatment – that's the heat treatment part, not melting – you hold below the melting point. Typical temperatures: 6061 aluminum at 530°C, 7075 at 470°C, A356 casting alloy at 540°C. Soak time depends on section thickness. Rule of thumb: one hour per 25mm of thickness. So a 75mm thick part soaks for three hours.
• Transfer. This is the critical step. You move the hot parts from the furnace to the quench tank. Fast. Every second counts.
• Quenching. The tank has water, oil, or polymer. Cools the parts rapidly. That freezes the microstructure.
• That's the cycle. The whole thing – heat, soak, transfer, quench.

• Precise temperature control. We use PLC or PID. But here's the real detail: for aluminum solution treatment, you need accuracy within ±5°C. Go above that range and you risk incipient melting – the grain boundaries melt. Go below and you don't fully dissolve the alloying elements. One customer was running 7075 parts at 480°C instead of 470°C – just 10 degrees high – and started seeing blistering on the surface. Came from overheating.
• Rapid quenching capability. Transfer time from furnace to quench should be under ten seconds for most aluminum alloys. For thin sections, under five seconds. We use a drop-bottom mechanism or a tilt table. A typical manual transfer – guys pulling a basket out with tongs – takes twenty to thirty seconds. That's too slow. The parts start cooling in air and you lose strength.
• Temperature uniformity. We spec ±5°C across the working zone. For a 2m x 2m x 1.5m chamber, we place nine thermocouples – corners, center, midpoints. I did a test once on a competitor's furnace. The top zone was 15°C hotter than the bottom. Their parts came out with inconsistent hardness. Same load, different results.
• Energy efficient. Ceramic fiber insulation, 250mm to 300mm thick. Heat loss on a 540°C holding cycle is about 30 kW for a mid-sized furnace. A brick lined furnace of the same size loses maybe 60 kW. Payback on the fiber upgrade is usually twelve to eighteen months depending on your electricity price.
• Heating methods. Electric or gas. Electric gives better temperature uniformity because you can zone control more precisely. Gas heats faster but you need good circulation. We've done both. For aerospace work, most customers want electric. For foundries doing high volume, gas is fine.
• Production efficiency. Batch or continuous. We build both. A continuous furnace for aluminum wheels runs maybe 60 wheels per hour. Batch furnace for large forgings – one load per shift, maybe 8 to 10 tons.
• Durable structure. Heat resistant steel for the chamber. 310 stainless or Inconel if you're doing really high temp work. The refractory lining is low cement castable rated for 1200°C even though you only run at 550°C. Why over-spec? Because the lining lasts longer.

Customization Capabilities

 

Dingfeng Industrial Furnace – we change things based on what you run. Call it customization if you want. I just call it building what you need.

• Size. We've built chambers from 1m x 1m x 1m for small job shops up to 6m x 3m x 3m for aerospace extrusion lines. The big one held 4 tons of 7075 profiles.
• Temperature. Standard units go to 600°C. That covers all aluminum solution treatment. If you need higher for other alloys, we can go to 1000°C but that's a different design.
• Load capacity. Trolley furnaces handle 500 kg to 10 tons. Pit furnaces handle more – up to 30 tons for big forgings.
• Functional. Quench tank options: water, polymer, oil. Agitated or static. Heated quench or cold. Transfer mechanisms: drop bottom, tilt table, pull out basket. We've done all of them.
• Heat source. Electric or gas. Electric is more common for aluminum because of the temperature uniformity requirement.
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