Monthly Archives: January 2016

Buyer’s Tips for Purchasing a Car Bottom Furnace

Before you begin shopping around for a Car Bottom Furnace there are a few requirements that you will need to figure out before you start the process.  Here are some tips to that will help determine the type of Car Bottom Furnace that will suit your needs best.

What is the typical Temperature Uniformity needed in my Car Bottom Furnace?  These Furnaces typically operate at about plus or – 25 deg. F uniformity depending on the maximum temperature.  A Car Bottom Furnace can also achieve tighter uniformity (+ or – 10 degrees F), but the engineering must be precise. Typical temperatures are around 1350 deg. F range at + or – 25 deg. F.

 Does my Process Require Pressure Controlled Flue Dampers?  There are benefits to including a pressure transducers and a control motor/linkage in a Car Bottom Furnace. These benefits include greater control over the flue which gives the user excellent temperature uniformity.

 Will my Car be sealed on the side and back walls when inside the Furnace?  Every Car Bottom Furnace should utilize some style of “bumper” system that will thoroughly seal the car inside the unit.  The drive mechanism for the car is shielded by the Refractory surfaces and is located beneath the car.

 Do I need an Accreditation approved Control Panel?  The a well known independent, globally accredited Safety Company. U.L. requires a high safety and quality standards for all products. Good manufacturers use components accredited by the U.L.  These parts will have a U.L. Classified Sticker on the unit.

 Will the Combustion System be rated to Factory Mutual, IRI and NFPA 86 standards?  Car Bottom Furnace units should come equipped with several safety mechanisms including surplus Gas Safety shut off valves, High/Low Gas Pressure Switches, Isolation gas cocks, flame supervision with Ultra Violet (U.V.) and Scanners Air Proving switches.  A Car Bottom Furnace Burner should not ignite until a purge air cycle has been concluded at start up. Burners can light on low fire and vary safely to high fire via linkage and drive component.

 Will I need Installation/Start up assistance for My New Car Bottom Furnace?   It is always a good idea to be trained from the manufacturer on your specific unit as well as on trouble shooting tactics whether you have an onsite engineer or not. The manufacturer should also provide you with drawing of your unit as well as an operating manual.  

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Forming Oven 101

One of the most widely used thermal processes in manufacturing is called Forming. Forming processes are used in nearly every aspect of industrial manufacturing due to its versatility and ability to adapt to every application. Components created in a Forming Oven are used to make everything from Mac truck panels, bicycle helmets and spaceships.

Forming is the process where metal or plastic is stretched, drawn or bent in order to create a desired shape while maintaining the material’s tensile strength and ductility. The prerequisite to forming is that the materials have an ultra fine grain size. Processing materials while in a super heated state called Thermoforming. The desired application and material determine the type of process and temperature performed in the forming oven.  Forming techniques include stretching a material over a mold, vacuuming the material into a concave or blowing air into material to produce a hollowed out center.

One of the major advantages to processing in a forming oven is that you can form large and complex pieces in a single operation. These finished pieces have a fine surface and are created with excellent precision. A forming oven also allows the manufacturer to create very large works which eliminates the need for assemblies and additional pieces. This simplicity means that the finished pieces are lighter, which is particularly important to the aerospace industry. The main disadvantage is the slow forming rate of thick gauge materials, which can equate to a lower volume production for certain products.  Thin gauge materials, on the other hand, can be produced and finished very quickly.

Because a forming oven can be configured to process glass, metal or plastic, these units have become an essential part of manufacturing within the automotive, aerospace and medical equipment industries. Forming ovens are also very popular because their processes incur lower tooling costs than other metal manufacturing methods.

In the last decade forming oven processing, specifically thermoforming processing, has been greatly improved with the advancement of microprocessors and computer controls, which have increased process control and repeatability. Electric servo motors are also now being used in more sophisticated units for actuation of the machine platens, which gives operators more precise control over closing and opening speeds as well as tooling timing.

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