For rolling sheet metal and plate into semi-circles, cylinder shapes or cones.
Tell us what size and type of metal you need to form and the radius to be formed. You will like our price.
Scroll down below to see photos and specifications of many different machines.
in curving your sheet metal or plate? Our 3 roll benders work by pinching
the metal between two rolls and curving it as it comes in contact with
a back forming roll. This curves the metal workpiece into a cylindrical
form, where it is welded together to produce a cylinder. The upper roll
is in a fixed position, the lower roll has adjustable movement to perform
the gripping function. These are the "pinch" rolls. The third roll (the
forming roll) is also adjustable. With a manually opened or hydraulically
moved drop hinge, the end of the top shaft is opened to allow removal
of the finished work piece, especially a completed tube shape. You may
also weld the seam while its still on the machine (ground to part with
machine power off).
is a diagram showing how a plate is formed into a tube with a single (initial)
pinch plate rolling machine.
Single-pinch (initial-pinch) machines are the most common and may require inserting the workpiece into the machine twice in order to prebend both ends to eliminate flat spots when rolling a full tube shape and to ensure better closure of the seam. To prebend the first end, the operator inserts the plate into the machine, which clamps it and pinches it between the top roll and bottom pinch roll. A rear bending roll, moving diagonally toward the top roll, pushes against the metal to bend the radius. The operator then removes the plate from the bender, rotates the plate 180 degrees to insert the second end into the rolls, then rolls the cylinder to completion. Recommended maximum thickness (or width instead) for prebending is usually 3/4 of the capacity of the machine. Bending thickness can be increased slightly if rolling a narrower width. Consult American Machine Tools Company for advice.
Double pinch pyramid machines can prebend both ends of a plate with a single insertion into the bending machine, for reduction in material handling and time. But they cost more and cannot roll as tight a diameter. The wide opening between the rolls allows heavy plate to be rolled. On double pinch machines, the top roll position is fixed and the two lower rolls move in a straight path or an arc toward the top roll. 4 roll versions can accurately roll metal to tighter diameters and can do it in one pass through because the metal is always held by the pinch roll while the 3rd and 4th rolls take turns curving the metal.
Double pinch rolls and 4 roll machines are quicker and easier to use, but cost more.
Forming a full tube shape should have little if any gap in the middle of the seam due to the "crowning" of the rolls. Crowning is where the rolls are slightly larger diameter in the middle which compensates for deflection under load. If the crowning is not enough try wrapping and taping a piece of shim stock around the middle of the bending roll to over-compensate for deflection. Crowning has a side effect of causing very thin metal to have a gap at the ends. If a gap occurs, either in the middle or the ends, it can be pulled together using a ratchet strap, come-along, clamps or the vise grips with chain attachment. If you want to roll thick flat bar, pipe, tubing, angle iron or channel into a curve then go to Pipe and Structural Shape Bending machines.
On most of our machines, rolling a sheet metal cone shape can be formed by pre-cutting a flat metal blank with the correct inner and outer radius to form the cone (funnel) shape wanted. Normally the blank is fed on one side so that the inner radius can be slowed or stopped against a cone rolling attachment. The inner radius is supposed to go thru the rolls slower than the outer radius. The bending (forming) roll position should be independently adjusted lower on on the drive side to match the taper of cone. Cones take a lot of time to make. Fabricators usually pracitce with cardboard first. Contact an American Machine Tools sales engineer for more information.
Powered roll machines are very dangerous if used carelessly because they
can crush fingers, hands, etc. Always keep hands, fingers, hair and clothing
clear. Safety guarding or devices such as Light Curtains are recommended
for predictable repeat uses. Safety compliance is the users responsibility.
Please take it seriously.
increases with soft aluminum and decreases with stainless steel.
Thickness Conversion Chart - Sheet Metal Gauge to thickness in inches and metric
3-ROLL SINGLE-PINCH HYDRAULIC PLATE BENDING ROLL MACHINE:
All 3 rolls are driven by a hydraulic motor. Crowned alloy steel rolls. Foot control for forward and reverse. Bending roll is hydraulically powered up and down with digital readout showing position. Bending roll cylinders adjust in synch or independently to help for making cones. Grooves at one end for rolling round bar sizes 3/8", 1/2", 5/8". Cone forming attachment is included. Good medium use machine made in Taiwan. Almost always in stock.
Click to see a nice VIDEO of this Bending Roll
3-ROLL SINGLE-PINCH HYDRAULIC PLATE BENDING ROLLS:
Hydraulic powered bending roll adjustment.
All push button operation instead of foot pedal and handwheel. The lower pinch roll has our special hydraulic powered "quick gap set" which is a real time saver for metal thickness set up. The pinch roll is also easily tiltable for cone rolling. An adjustable position attachment for making cones is included. It allows for both the stop-start-adjust method or the vice grip holding method of cone rolling. Push button hydraulic opening of the top roll bearing assembly for easy finished part removal. As with all CHICAGO bending rolls, the frames are made of extra heavy welded steel construction. The rolls are made from forged steel and heat treated to RC45. Heavy duty spherical roller bearings on all three rolls minimize friction loss. The rear bending roll is equipped with a GO TO LED digital readout indicating its position for accurate repeat forming. Positioning of the rear bending roll is done hydraulically via push buttons and allows the operator to tilt it for cone forming. An emergency stop button and keylock on/off power switch are centrally located on the control panel. Excellent machine for frequent use.
BIRMINGHAM 3-ROLL DOUBLE-PINCH HYDRAULIC PLATE BENDING ROLL MACHINE:
button control panel (not shown in photo above)
AKYAPAK AHS 4-Roll Plate Roll Machines
View our huge selection of Akyapak AHS 4 Roll Plate Rolls. Please find the size you are interested in below based on the length and pre-bend thickness then click the model number to request a quote. We will send you a formal quotation with prices and complete information within 72 hours.
The Akyapak Company manufactures 4 rolls hydraulic plate bending machines with capacity in thickness from from 14 gauge to 6 inches thick and widths from 20 inches to 40 feet (2 mm to 150 mm and in width from 500 mm to 12000 mm)
Productive and Reliable
As well as being reliable, AHS increases productivity with its high speed rolling ability and it overcomes the most challenging bends thanks to its ease of use. Since the plate is pinched during rolling, unwanted skidding and slipping of your material is prevented.
In AHS 4-Roll Plate Rolling Machines, one of the side rolls can be used as a squaring roll, thus the plate can be easily and precisely aligned along the roll across the input direction.
Less Flat Ends with a Single Pass
In AHS 4-Roll Machines, it is possible to achieve a full cylinder in a single pass because the metal can be pinched with the lower-roll during pre-bending and bending. AHS model allows for precise pinching of the plate between upper and lower rolls.
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