Mandrel Bending

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In this process, a mandrel—a metal rod or ball—is inserted into the tube while it is being bent, which creates a more precise bend with no wrinkles or kinks. For some applications, it is acceptable to have a wrinkled tube; particularly when the tube just has to function and quality is not a factor. Read More…

Mandrel Bending Mandrel bending, also known as mandrel tooling, is a sub-process of tube bending.

Leading Manufacturers

Apple Valley, CA  |  760-948-4220

As tube fabrication experts, we can solve your fabrication problems with ease! We take our product quality seriously, as we started our company sourcing tube products for the Apollo project. Our company goal is to satisfy customers by offering high quality products, outstanding customer service, and affordable prices. Visit us online today to learn more!

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Tube Bending Incorporated $$$

Cleveland, OH  |  216-662-2000

As tube fabrication specialists, United Metal Fabricators supplies custom formed and fabricated tubular and pipe assemblies for the chemical, nuclear, aerospace and industrial sectors. United Metal Fabricators is known for its Quality, Service, Dependability and On-Time Delivery. Discover all the services and capabilities this experienced company has to offer.

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United Metal Fabricators, Inc. $$$

Davenport, IA  |  563-285-1914

Tube fabrication is our mainstay. Designing, engineering, tube cutting, tube bending, tube end forming, slotting, welding and CNC machining bring your project to realization. We maintain a diverse customer base—retail (fixtures, displays), sporting goods, medical, office furniture, automotive, agriculture.

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Superior Tube Products $$$

Troutdale, OR  |  800-547-2414

Since 1963, Tube Specialties Company has been the industry leader for Tube Bending, Pipe Bending, Tube Fabrication, Pipe Fabrication, Tube Punching, Tube Forming and Tube Welding; offering real solutions for the most complex tube requirements. With one of the most diverse steel fabrication plants in the United States, we are your complete fabrication company providing quality products and service.

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Tube Specialties Company (TSCO) $$$

Schofield , WI  |  800-283-8302

J & D Tube Benders is recognized as the fastest in tubeline fabrication. We supply hydraulic tube assemblies and manifolds, plus offer a number of in-house tube fabricating services: plating, coating, welding, brazing. Serving customers since 1971. Call us today! We are ISO 9001: 2000 certified.

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J & D Tube Benders Inc. $$$

Youngstown, OH  |  330-779-0263

RB Fabricators Inc. is a pipe bending and fabricating business. Our primary industry segments are steel, chemical, architectural, pneumatic and vacuum. Our headquarters is in Youngstown, Ohio which places us close to core producers and industries. We serve our customers with excellent products of high value in an efficient and timely manner.

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RB Fabricators Inc. $$$
placeholder image Tube Bending Incorporated United Metal Fabricators, Inc. Superior Tube Products Tube Specialties Company (TSCO) J & D Tube Benders Inc. RB Fabricators Inc.

The process of mandrel bending provides a high quality tube because the amount of flow is improved, making the inside diameter of the tube consistent throughout, even at the bend; something that is not possible to do without using a mandrel. Mandrel bending is commonly used in exhaust applications in the automotive industry, pipe applications in the plumbing industry and instrument applications in the musical instrument manufacturing industry because the process improves the look of the bend and also creates a much tighter bend than is possible with empty bending. When the mandrel is inserted into the tube, it has to be strong enough to support the tube so that it won’t be deformed during bending, but also flexible enough to ensure that the tube is still properly bent.

Mandrel bending takes place during the rotary-draw tube-bending process. With rotary-draw bending, a tube’s bend is created by placing the tube around the form of a rotating bend. The tube is attached to the bend form, and as the form moves forward it is designed to bend the tube in the right places, specific to each tube. Mandrel bending occurs during this process by placing a mandrel inside the tube so that as the tube is bent, the mandrel bends with it, which helps keep the tube’s shape from deforming and provides a precise bend, free of kinks.

Mandrels are usually made of an aluminum-bronze alloy or steel. The aluminum-bronze type is used to bend harder materials such as stainless steel or titanium, while steel mandrels are typically used to bend softer materials such as copper or aluminum. There are different types of mandrels that meet various bending needs: common types include plug mandrels, form mandrels and ball mandrels. Plug mandrels are solid rods that are inserted into the tube; this type of mandrel is often used on tubes that have thicker walls, a larger radius and are going to be bent normally.

Form mandrels are similar to plug mandrels in that they are also a solid rod, but the tips of these mandrels are formed to fit a tube’s specific radius; essentially, it is a custom mandrel. Ball mandrels consist of ball bearings—which can be linked or unlinked—being inserted into the tube. These mandrels are used when a precise bend is required in a tube.

Mandrel Bending Informational Video