One Minute Mentor: Plasma Nitriding Equipment

Cold-walled (double-walled water-cooled) systems were the first generation of plasma nitriding furnaces. This technology is also a vacuum-based process but employs the principle of glow discharge to provide energy for heating and nitriding at one time. Therefore, the independent control of the temperature stability and the nitriding intensity is not possible because both processes are using the same energy source—the plasma.

The hot-wall plasma nitriding furnaces, the next generation of cold-wall ion nitriding systems, are mainly used and built now. This system ensures optimal nitriding quality by fulfilling the highest demands on temperature and nitriding process control. The big advantage of this technology is the separation of the control of the heating and the plasma nitriding parameters. The heating and temperature control of hot-wall plasma nitriding furnaces is realized by several independent heating/cooling zones, which guarantees optimal temperature homogeneity

For more information, click on the link below (subscription required). Then scroll to Figure 26.

R Schneider; R. Mesquita; H. Altena; T. Müller; P. Seemann, Processes and Furnace Equipment for Heat Treating of Tool Steels, ASM International, 2014, https://doi.org/10.31399/asm.hb.v04d.a0005958

Wisconsin Oven ships electrically heated horizontal quench system

Wisconsin Oven, East Troy, announced the shipment of an Electrically Heated Horizontal Quench System to a manufacturer of products for the automotive industry. This system will be used for the solution treatment of aluminum.

The maximum temperature for this horizontal quench furnace is 1200°F and interior chamber dimensions of 2′ wide x 2′ high x 2′ long. The system has the capacity to heat 450 pounds of aluminum parts and the steel basket within 60 minutes. Temperature uniformity of +/- 10°F at set points 850°F and 1050° F was verified with a nine point profile test prior to shipment.

This horizontal quench system provides a 15 second quench delay from when the door begins to open until the load is fully submerged in the tank. The quench is manual, where the operator pulls the load out of the oven and onto the quench elevator using a hook. The quench delay time is recorded and enforced using sensors to detect the start and end of the quench operation, and to stop the process if the quench delay time expires.

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EndoFlex generator chosen for fastener heat treatment

UPC-Marathon, Quebec,, a Nitrex company, has commissioned a 100 M3H EndoFlex endothermic gas generator for a South American manufacturer of industrial fasteners.

This is a repeat customer that has UPC-Marathon‘s gas panels, flowmeters, oxygen probes, and Protherm plant automation software installed in their heat treatment operations. With the addition of the EndoFlex generator, they will now be able to supply gas to a new continuous mesh belt neutral hardening furnace for the treatment of metal fasteners used in automotive applications.

The customer had the option to choose between a nitrogen-methanol system or an endothermic gas generator for their neutral hardening furnace. After careful consideration, they selected UPC-Marathon’s EndoFlex generator in order to achieve better control and consistency of the process atmosphere. The result is an improved hardening process and higher-quality hardened fasteners, along with reduced operating costs. The EndoFlex mixes ratios more accurately and efficiently, ensuring a constant furnace atmosphere and consistent gas quality, leading to immediate cost savings through reduced electricity and gas consumption and zero waste.

The system was started in March 2023, and its consistent performance has exceeded the customer’s expectations.

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Multi-furnace heat treat project for major steel forger

Nutec Bickley, Mexico, has been awarded a contract to manufacture and install five new lift-up furnaces, along with a fully modernized combustion system, for a leading U.S. manufacturer of high-quality alloy steel and carbon steel closed-die forgings. The project will take place between May and December 2023, with onsite work completed one furnace at a time to ensure the customer’s production schedules are not impacted. Two of the new furnaces will be used for tempering, while the remaining three will be used for austenitizing. Each furnace will be fitted with the latest control systems, complete fiber flues, and new exhaust and pressure control systems, along with insulation.

Nutec Bickley’s state-of-the-art combustion packages will be fully compliant with NFPA 86 standards, incorporating a fuel-only control system to allow maximum temperature uniformity potential for all cycles. The retrofitted furnaces will benefit from high-velocity nozzle mixing burners fitted with high-temperature burner blocks. The combustion systems will also feature automatic air control valves to adjust the maximum air volume used and to ensure proper burner ignition conditions.

The project will involve careful teamwork between the customer and Nutec Bickley to ensure successful delivery and highest quality outcomes. Rodrigo González, VP Metals at Nutec Bickley, emphasized the importance of constant communication and status updates with customers for a dynamic and mutually beneficial project result.

 

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Improving the Nitriding Process Using ZeroFlow® Gas Nitriding Technology

Gas nitriding has been performed for almost a century with many variations over the years. The benefits of nitriding are well documented and nitriding has gained amazing industrial acceptance. However, the equipment and control of the nitrided layer has continued to be challenging, and as such, nitriding is still slowly being adopted by industry, but the rate of change is improving.

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