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Forum Overview » Homepagetools - Support » Off-Topic » In Line Degassing Unit Machine
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In Line Degassing Unit Machine
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Aluminium In Line Degassing Unit Machine

Molten aluminum is extremely reactive, so when it comes in contact with moist air or wet tools, the water decomposes to release hydrogen in the melt. Excessive quantities of this dissolved gas have a well-documented detrimental effect on the mechanical properties of the final aluminum castings. What is also well known to anyone making castings is that dissolved gas has an overriding effect on the distribution and amount of porosity and shrinkage. Dissolved hydrogen levels must be controlled to minimize scrap. To control gas in aluminum, metalcasters must accomplish two things:

1. Prevent and minimize introduction of hydrogen in the melt.

2. Measure and remove the hydrogen prior to pouring.

This article will focus on measurement and removal.

Gas Removal

The ability to degas molten aluminum is generally accomplished by using a purge gas, typically introduced into the melt by a rotary degassing unit. This degassing process is limited by thermodynamic laws; when purge gas bubbles are introduced to the melt, they collect hydrogen as they float toward the surface. The best possible situation is these hydrogen-saturated bubbles leave the melt and reduce hydrogen levels. In this case, the process efficiency is 100% from the thermodynamic point of view. But as the gas content in the melt drops, so does the equilibrium pressure of hydrogen in the bubbles, so the amount of purge gas required to remove the remaining hydrogen must increase.

The equilibrium gas removal ratio is shown in Fig. 1 for pure aluminum above 1,400F (760C). A gas removal ratio of 200, for example, means it will take 200 liters of inert gas to remove one liter of hydrogen. This behavior limits a metalcaster’s ability to degas to a very low level of hydrogen. The solubility also increases exponentially with temperature, meaning an increase of 200F (111C) doubles the solubility. All things being equal, a higher temperature of an aluminum melt will increase the necessary degassing time.

Alloying elements also can have an effect on hydrogen solubility. The effect of alloying elements is characterized by changes in the alloy correction factor, with some common casting alloys show in Table 1. Alloys having greater values are more difficult to degas, so, for example, aluminum 535 will take four times longer to degas than pure aluminum. Fortunately, these factors can be controlled and the gas content and process required to eliminate excessive porosity in aluminum castings can be achieved without undue difficulty in most cases.



Aluminium In Line Degassing Unit Machine

Practical Degassing Procedures

Degassing is usually accomplished in one of three areas of the metalcasting facility:

1. In the transfer ladle, used to convey metal between melting and holding furnaces.

2. In crucible furnaces, usually just before the molten aluminum is cast.

3. In an in-line system, when the metal is conveyed to holding furnaces through a launder.

The first two options are most common and the degassing operation for both is typically accomplished using a rotary impeller degasser (RID). In practical terms, all rotary degassers are not created equal. It is important to have an optimum head design to produce highly efficient, small bubbles. Significant cost savings may be realized from shorter treatment times and reduced gas usage. In the past, the metalcasting industry has gravitated toward simple head designs, which are less costly to machine but produce larger bubbles. This path presents a false economy due to reduced efficiency.

Aluminium In Line Degassing Unit Machine

Adjusting Process Parameters

Once the RID unit is fully lowered into the liquid metal with the shaft in place, the degassing operation can begin. The best shaft location is slightly off the centerline of the crucible or ladle to help avoid vortex formation with its circular rotation in the liquid metal. An offset distance of 2-4 in. from the centerline is usually sufficient. The use of a baffle plate also is a good idea, because the baffle opposes the circulation movement of metal and reduces vortex formation.

With the RID in the proper location, the unit should be turned on and the shaft speed should be set to 300 RPM. The inert gas flow also should be on and operators should then adjust the gas flow rate and shaft speed. Gas flow should be increased until see gas bubbles are visible as they float to the surface of the liquid metal. As the gas flow increases, the size of the bubbles should increase.

The desired result is a good dispersion of small bubbles while maintaining a relatively quiet surface. When an optimal combination of flow rate and shaft rotation speed is found, note the parameters for future use. Also note the total degassing time, which normally falls somewhere between four and eight minutes, unless the temperatures are very high or the amount of gas needed is low.

Aluminium In Line Degassing Unit Machine

Gas Measurement

There are two primary methods of gas analysis, sampling techniques and in situ methods. Sampling techniques may be further divided into two classes. In the first, a liquid sample is wit



4/13/2022 10:39:57 AM   
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A nuts packaging machine designed for the preservation of dry products offers a reliable and efficient solution to ensure the freshness and shelf life of nut products. Dry products like nuts require specific packaging considerations to maintain their quality and prevent spoilage. Here you can visit Baopack website, A specialized nuts packaging machine addresses these requirements by providing the following features: Air-tight Sealing: The machine utilizes advanced sealing technology to create airtight packages. This helps to preserve the freshness of the nuts by preventing exposure to air and moisture, which can lead to rancidity and spoilage. Moisture Control: The packaging machine may incorporate moisture control mechanisms to regulate and reduce moisture levels within the package. This is especially important for nuts, as excessive moisture can lead to mold growth and degradation of their texture and flavor. Oxygen Barrier: Nuts packaging machines can utilize packaging materials that act as an effective oxygen barrier. This helps to minimize oxygen exposure, which can cause oxidation and deterioration of the nuts' quality. Customizable Packaging Options: The machine allows for flexible packaging options, such as different bag sizes and formats, to suit the specific needs of nut products. This ensures that the packaging is appropriately sized and optimized for preserving the nuts' freshness. Efficient Packaging Process: The machine is designed to handle the packaging process with efficiency and precision. It can weigh and dispense the nuts accurately, ensuring consistent portioning and reducing waste. By utilizing a nuts packaging machine tailored for dry product preservation, nut producers can enhance the shelf life and maintain the quality of their products. The machine's features, such as air-tight sealing, moisture control, oxygen barrier, and customizable packaging options, contribute to the preservation of the nuts' freshness, flavor, and texture.







5/29/2023 7:48:19 AM   
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Upgrading Your Manufacturing Process: Incorporating CNC Vertical Machining Centers

Incorporating CNC Vertical Machining Centers (VMCs) into your manufacturing process is a transformative upgrade that can revolutionize your production capabilities. These advanced machines offer unmatched precision, efficiency, and versatility, elevating the quality of your products while reducing manufacturing time and costs.

With their computer-controlled operation, CNC VMCs eliminate human errors and ensure consistent and repeatable results. This leads to improved product quality and reduced scrap rates. Additionally, their ability to handle complex geometries and multi-axis machining opens up new possibilities for designing intricate components. Click here to visit https://www.del-cnc.com/product/cnc-vertical-machining-center

The seamless integration of CAD/CAM software with CNC VMCs streamlines the production workflow, enabling faster design-to-production cycles and increased productivity. By embracing this cutting-edge technology, your business can stay competitive, meet customer demands, and unlock new opportunities for growth in the dynamic world of modern manufacturing.


7/27/2023 3:23:21 AM   
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We will explore the key features and benefits of this remarkable machine, shedding light on how it can enhance your production capabilities visit here. So, get ready to discover the power of the In Line Degassing Unit Machine and unlock a whole new level of efficiency in your industry. Stay tuned for an in-depth look at this game-changing innovation!


11/9/2023 7:48:40 PM   
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The In Line Degassing Unit Machine represents a cutting-edge solution in the field of packaging machinery, revolutionizing the way gases are managed during the packaging process. This state-of-the-art equipment efficiently removes unwanted gases from liquids, ensuring product quality and extending shelf life. The In Line Degassing Unit Machine is equipped with advanced technology that not only enhances the degassing process but also optimizes overall packaging efficiency. For businesses aiming to elevate their packaging operations and deliver products of superior quality, investing in this innovative machine is a strategic move. Don't miss out on the opportunity to enhance your packaging capabilities – go now to get the best packaging machinery available in the market.


11/10/2023 4:20:29 AM   
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The In-Line Degassing Unit Machine is a crucial component in modern manufacturing processes, ensuring the removal of unwanted gases from liquids. This advanced technology plays a vital role in enhancing product quality and efficiency. For cutting-edge solutions in CNC machinery, visit https://www.eagletec-cnc.com/. Their expertise in providing state-of-the-art equipment, including In Line Degassing Unit Machines, showcases a commitment to innovation and excellence in the industry. Explore the website to discover a wide range of CNC solutions that can elevate your manufacturing capabilities.


1/3/2024 11:19:56 AM   
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Forum Overview » Homepagetools - Support » Off-Topic » In Line Degassing Unit Machine

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