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Plate
Rolls
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Bending
Rolls and Slip Roll
machines 
For
rolling sheet metal and plate into arcs 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 or hydraulically moved drop hinge, the end of the top shaft is opened to allow removal of the finished work piece, especially a completed cylinder shape that may even have had it's seam welded while still on the machine. 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 and 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 the job experience.
Single-pinch (initial-pinch) machines require inserting the workpiece into the machine twice in order to prebend both ends of a cylinder and ensure 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 and bottom rolls. A side roll, moving diagonally toward the top roll, sets bend 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.
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. These machines can act as single-pinch machines or as pyramid machines, allowing the fabricator to select the best procedure for a particular job. The wide opening between the rolls allows short, heavy plate to be rolled. Double pinch machines drive all three rolls, the top roll is fixed and the two lower rolls move in a straight path or an arc toward the top roll. This type of machine is to eliminate the need for feeding the sheet through more than once. Expension 4 roll versions roll metal the tightest.
On some machines, a 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 forming attachment. The bending roll position can also be independently adjusted lower on one side to help.
Below
is a diagram showing how a plate is formed into a cylinder with a
single (initial) pinch plate rolling machine.
Note: Powered roll machines are very dangerous if used carelessly. Click for OSHA's machinery safety website
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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$790
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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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$940
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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 |
$2695
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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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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 cylinder). |
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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" is a real time saver during set up. The pinch roll is also tiltable for cone rolling. Hydraulic operation of the drop end for ease of material removal is an added convenience. 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 RC 45. Spherical roller bearings on all three rolls minimize friction loss. The rear bending roll is equipped with a GOTO LED readout indicating its position for accurate forming. Positioning of the rear bending roll is done hydraulically 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.
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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 Machine Tool Distributor Bending Rolls
5864 Northwest Hwy
Chicago IL 60631 USA
Phone: 773-334-5000
Fax: 773-442-0314
Click to email us
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