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Plate
Rolls
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Plate
Bending Rolls and Slip Roll machines
For
rolling sheet metal and plate into arcs, cones or cylinder shapes.
Tell us what type and size 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.
Three
roll benders work by "pinching" the flat workpiece between two rolls
and bending it as it comes in contact with a forming roll. This bends
the 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).
Note: Without alot of skill, on 3 roll machines, it can be difficult
to form metal into tubular shapes smaller than 3 times the upper roll
diameter when forming near capacity thickness. 1.5 times the upper
roll diameter is often the tightest diameter using thinner and narrower
metal. Results vary depending on metal thickness, width, tensile strength
and on your level of expertise.
Below
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 falt spots when rolling a full tube shape and 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 2/3 to 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, also called three-roll double-pinch machines, can also 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. The wide opening between the rolls allows short, 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. Expension 4 roll versions roll metal the tightest, especially if at least 2 or 3 of the rolls are driven.
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 12" of the bending roll to over-compensate for deflection. Crowning has a side effect of causing 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.
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. Usually the blank is fed on one side so that the inner radius can be held against a cone rolling attachment. The inner radius is supposed to go thru slower than the outer radius. The bending roll position should be independently adjusted lower on on the drive side to match the taper of cone. Contact an American Machine Tools sales engineer for more information.
NOTE: 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. For OSHA's machinery safety website go to http://www.osha.gov/SLTC/etools/machineguarding/index.html
Capacity
increases with soft aluminum and decreases with stainless steel.
Click for chart of tensile strengths for aluminum and stainless steel
(to calculate equivalent machine capacity)
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26
gauge
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24
ga.
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22
ga.
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20
ga .
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18
ga.
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16
ga.
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14
ga.
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13
ga.
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12
ga.
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11
ga.
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10
ga.
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9
ga.
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8
ga.
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7
ga.
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6
gauge
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.018"
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.024"
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.030"
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.036"
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.048"
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.060"
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.075"
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.090"
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.105"
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.120"
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.135"
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.150"
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.164"
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.180"
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.194"
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.46mm
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.61mm
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.76mm
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.91mm
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1.2mm
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1.5mm
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1.9mm
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2.3mm
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2.7mm
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3mm
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3.4mm
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3.8mm
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4mm
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4.6mm
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4.9mm
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Thickness Conversion Chart - Sheet Metal Gauge to thickness in inches and metric
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Chicago Dreis & Krump Hand Operated Slip
Rolls: Its hard to make portable slip roll machinery that can out perform Chicago Dreis & Krump. 3 sizes to choose from. We also offer a little 12 inch long machine with 1 inch diameter rolls from another company for $345. |
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Call
773-334-5000
to order a machine |
Price
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Capacity
Mild Steel |
Roll
Diameter |
Wire
Grooves |
Gearing
Ratio |
Shipping
Weight |
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SR-2420
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$725..
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24"
x 20 gauge
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2"
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1/4", 5/16", 3/8" |
1:1
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145
Lbs.
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SR-3622
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$810.
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36"
x 22 gauge
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2"
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1/4",
5/16", 3/8"
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1:1
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200
Lbs.
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SR-5016
Includes Stand |
$2450.
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50"
x 16 gauge
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3"
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5/16",
3/8", 1/2"
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3:1
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530
Lbs.
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Electric
Powered Slip Rolls: $2795. |
Birmingham model X5016E
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GMC
SINGLE PINCH BENDING ROLLS
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BIRMINGHAM
3-ROLL SINGLE-PINCH HYDRAULIC PLATE BENDING ROLLS
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1. Electrical
control cabinet. |
1. Photo
shows top roll being swiveled out (for removing a completely
formed tube). |
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* Hydraulic powered bending roll adjustment.
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The lower pinch roll has our special hydraulic powered "quick gap set" which is a real time saver during set up. The pinch roll is also tiltable for 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 GOTO 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. Good frequent use machine.
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BIRMINGHAM 3-ROLL DOUBLE-PINCH HYDRAULIC PLATE BENDING ROLL
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• All
3 rolls hydraulically driven independently.
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3 in
1 Combination Machines Shear
has squaring bar, adjustable hold-downs and back gauge. Capacity:
.030"
(22 gauge).
[shear
is not meant for constant use] |
 Diameter of Rolls: 1.97 inches New Color: Black |
Click for Pipe and Structural Shape Bending machines
Click for American Machine Tools homepage
5864 Northwest Hwy
Chicago IL 60631 USA
Phone: 773-334-5000
Fax: 773-442-0314
Click to email us
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