Plate Bending Rolls, Sheet Metal Slip Rolling Machines

Nov. 04, 2024

Plate Bending Rolls, Sheet Metal Slip Rolling Machines

PLATE BENDING ROLLS and SLIP ROLL MACHINES

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.

Interested in curving your sheet metal or plate? We have 3 roll and 4 roll benders that work by pinching the metal between the top and bottom 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 support end of the top shaft can be 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.

With competitive price and timely delivery, LECN sincerely hope to be your supplier and partner.

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 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 with 3 rolls 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. The downside is that after prebending the leading edge, control of the plate needs to be passed over to the other bottom roll which switches rolls from bending roll to pinch roll.

Finally, 4 roll machines can accurately roll metal to tight diameters and can do it in one pass through because the metal is always held in position by the bottm pinch roll while the 3rd and 4th rolls take turns curving the metal. You can make cylinder shapes, oval shapes, cone shapes, semi-curves, and shapes with curves and straight sections. We sell Akyapak four roll machines. Scroll way down to see them. Below is a diagram of how to roll a plate into a cylindrical shape on a 4 roll machine.

Forming a full tube shape should have little or no 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 angle roll 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 help taper the cone. Cones take a lot of time to make. Fabricators usually practice with cardboard and then scrap metal first. The maximum cone size is about half the length of the rolls. 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.
*** Click for our Machinery Safety webpage ***.

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)

26 gauge

24 ga.

22 ga.

20 ga .

18 ga.

16 ga.

14 ga.

13 ga.

12 ga.

11 ga.

10 ga.

9 ga.

8 ga.

7 ga.

6 gauge

.018"

.024"

.030"

.036"

.048"

.060"

.075"

.090"

For more vertical rolling machine solutioninformation, please contact us. We will provide professional answers.

.105"

.120"

.135"

.150"

.164"

.180"

.194"

.46mm

.61mm

.76mm

.91mm

1.2mm

1.5mm

1.9mm

2.3mm

2.7mm

3mm

3.4mm

3.8mm

4mm

4.6mm

4.9mm

Thickness Conversion Chart - Sheet Metal Gauge to thickness in inches and metric

Click for the American Machine Tool Homepage

Plate Rolling Techniques: Understanding The Different ...

Plate rolling is a process that involves bending metal plates to form cylinders or curved shapes. It is a common metal fabrication technique used in various industries, including construction, aerospace, and manufacturing. Plate rolling techniques vary depending on the material being used, the thickness of the plate, and the desired shape. In this article, we discuss the different plate rolling techniques and their advantages and disadvantages.

Initial Pinch Roll Bending

Initial pinch bending is the most common plate rolling technique used in the industry. It involves feeding the metal plate through a set of three rollers, which apply pressure to the plate and bend it into a cylindrical shape. The three rollers are arranged whereas two rollers are aligned vertically and provide both the pinching (gripping) function and the rolling or feeding of the material. The third roll approaches from below and behind these pinch rolls to push the plate being formed into the radius desired.

Initial Pinch bending is a versatile design that is common in smaller material thicknesses (typically gauge materials) and can be used on a wide range of materials, including steel, aluminum, and titanium. The advantages of three-roll bending include ease of use, machine price, high precision, excellent repeatability, and the ability to produce large quantities of parts. However, it is not suitable for forming complex shapes or thicker & wider widths of materials. This forming method also requires the operator to remove the plate, rotate it 180° and reinsert it in order to pre-bend each end of the material being formed.

Four-Roll Bending

Four-Roll bending is a more advanced plate rolling technique that involves the use of four rollers instead of three. The rollers are arranged in a diamond shape, with the two smaller rollers at the sides providing the resistance against the plate being formed and the two larger rollers at the top & bottom. The plate is fed through the middle two rollers, which apply pressure to the plate constantly pinching it and providing the feeding of the plate, while the side two rollers apply pressure to the bottom of the plate in order to force it into the radius, or shape being formed.

Four-roll bending has several advantages over three-roll bending, including the ability to form complex shapes and the ability to roll thicker plates. It is also more efficient and requires less material handling than three-roll bending as it can pre-bend each end of the plate in one setup without having to remove and rotate the material. Altrhough a 4-Rolll Plate Roll is more expensive, it can save vast amounts of time when rolling and provide superior accuracy as the material is constantly pinched in the forming process. Also four roll machines are capable of rolling thinner materials all the way to materials in excess of 4" (100MM) in thicknesses.

Variable Geometry Rolling

Variable geometry rolling is a plate rolling technique that involves the use of a machine designed with 3 rolls in pyramid placement. The roller can be adjusted to form different shapes, including cones, cylinders, and elliptical shapes. The technique is suitable for a wide range of materials, including stainless steel, aluminum, and titanium, and can be used to form parts with a thickness of up to 6 inches.

Variable geometry rolling has several advantages over other plate rolling techniques, including the ability to form complex shapes and the ability to produce parts with a high degree of precision. It is also more efficient and requires less material handling than other techniques. However, it is more expensive and requires specialized equipment.

Conclusion

Plate rolling is a versatile metal fabrication technique that is used in various industries to form cylinders or curved shapes. There are several plate rolling techniques available, including Initial Pinch, Four-Roll & Variable Geometry Rolling. Each technique has its advantages and disadvantages, depending on the material being used, the thickness of the plate, and the desired shape. It is important to choose the right plate rolling technique for your application to ensure that you achieve the desired outcome. At BendmakUSA our expert staff can assist in choosing the right plate roll with the right optional accessories for your application and budget.

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