Additional information:

DUAL HEAD — FLEXIBILITY AND VERSATILITY
The Dual Head machine with clamp-then-form method of bending is the basis for highly flexible and versatile machines for all volumes, depending on application.

The concept of clamp-then-form bending of sheet metal is not new. Developed in the early 1900's, the method has been specified in machine tools for a variety of bending requirements.

FELDMANN has evolved the clamp-then-form method to satisfy the most stringent sheet metal bending and forming requirements in their Dual Head forming machines.

A sheet metal blank is inserted in the machine and positioned against the gauging system, manually or automatically.

When the machine is cycled, one or more pneumatic heads lowers to clamp the sheet metal blank in position against the bottom die. A beam with tooling then pivots upward forming the sheet metal around the open die.

Since the operator's hands do not touch or hold the material at any time throughout the bending cycle, the result is consistent and accurate parts throughout the production run.

The clamp-and-form method of bending and forming sheet metal is implemented in a variety of machines designed and built by FELDMANN. Dual Head, Sequence Bender or Line Bender machines are usually specified, although a Fixture or Special Machine may be designed to fit the application.

The Dual Head is unsurpassed in fabrication of individual wrappers, box sections, and U-shaped parts. The Dual Head is especially suited for forming a family of parts with minimum changeover time.

The standard Dual Head machine is designed with two heads. One head may be fixed with the second head adjustable to vary the width of bends, both heads may be fixed for stationary widths, or both heads adjustable, depending on the application. This adjustment can be manual, semi-automatic, or even servo mechanism controlled.

Bend Methods:     FOLD ACTION FOR SHARP RADIUS provides the sharpest bends with no material marking and scuffing. The tooling pivots as shown in the illustration. Variations of this action are the beam-on-beam and beam-on-beam with wipe action.   FOLD ACTION FOR LARGE RADIUS BENDS use the same pivot point as the straight fold action, but is combined with a radius die to provide a rounded bend. It is recommended for flat stock only. In any fold action forming, if the part being formed has an edge flange, it must be notched at the bend line.   TANGENT BEND—RACK AND PINION RADIUS TOOLING uses a sliding plate to interface with the material being formed to prevent scuffing and marring during forming. Bending at the tangent point makes a uniform bend and is ideal for parts with preformed flanges that must be stretch formed or compressed.   FOLD AND WIPE Z-BEND TOOLING makes a 90 degree bend then a reverse bend. This tooling combines fold action with conventional press wipe tooling.   FOLD AND WIPE C-BEND TOOLING makes a 90 degree bend then a second bend wiping the material across the top die. This tooling combines fold action with conventional press wipe tooling.   BEAM ON BEAM FOLD ACTION TOOLING completes two action bends in the same cycle by using an elbow hinging action on the bend beam and a corresponding die, usually specified for precoated material.