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Accurshear Metal Shear User Manual *5
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ACCURSHEAR model 62506 6' x 1/4' Hydraulic Shear
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1/4' X 10' Accurshear 25010 Shear 1985 - Fabricating / Sheet Metal Machinery
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Accurshear Hydraulic Shear, Model 825010 10' x 1/4' Mild Steel Sanson Northwest
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ACCURSHEAR 14' x 1/4' HYDRAULIC POWER SQUARING SHEAR, 825014
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10ga x 6' Accurshear 61356 Hydraulic Shear
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12' X 1/2' ACCURSHEAR MODEL #850012 HYDRAULIC SHEAR: YBM #10380
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Accurshear Model 625010, 1/4' x 10', Shear Instructions Manual
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6' X 1/4' ACCURSHEAR MODEL 62506 HYDRAULIC SHEAR: YBM #10054
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Accurshear 8500, 8250 & 8375 Series Shear Operation Parts & Electric Manual 1979
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Accurpress Accurshear Safety Guide and Reference Manual Year (1997)
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18' x 1/4' ACCURSHEAR '625018' HYDRAULIC POWER SQUARING SHEAR - #28540
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Accurshear Hydraulic Shear 3/4”x14’ W/ SC2 Control Backgauge Model 875014
1/4' x 8' Accurshear Hydraulic Power Squaring Plate Shear Power Back Gauge 62508
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1/4x10' Accurshear, Model 825010 manufactured 10/78, underpower
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1/4' x 10' Accurshear 625010 Hydraulic Power Squaring Shear
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1/2' x 10' Accurshear B850010 Hydraulic Power Squaring Plate Shear Metal Cutter
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1/2' x 10' Accurshear 850010 Hydraulic Power Shear Metal Plate Shearing
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Accurshear
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14 Gauge x 6' Accurshear Power Shear Plastic Lamination Cutter Hydraulic
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14 Gauge x 6' Accurshear Power Shear Plastic Lamination Cutter Hydraulic
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10' X 1/4' Accurshear 8250010 LP Hydraulic Shear
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3/8' X 10' ACCURSHEAR - USED
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1/2' x 12' Accurshear Hydraulic Shear, back gauge, sq. arm, stroke control ...
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Press Brakes are utilized in the forming lengths of sheet metal components. A press brake is a vital necessity to most metal fabricating shops with shape cutting capabilities, and is one of the most sought after and yet misunderstood machines available for metal working. Press Brakes are rated generally by their pressing capacity, or tonnage, and their overall bending length or machine width such as 175 X 10 (175 Tons of pressing force by 10' of overall length). The press brake may be fitted with a wide variety of standard and custom tooling that are used to press the material into the desired form. There are two major types of press brakes available on the used market as are described below.
Mechanical: A motor spins a large flywheel at high speed the operator then engages a clutch which can be activated via pneumatic, hydraulic or mechanical engagement. Once the clutch is engaged the moving flywheel is mated to a crankshaft in which the machines ram is attached. The crankshaft then spins cycling the ram up and down. The advantage to this type of press brake is that the machine is electronically simpler and, due to the crankshaft action tonnages are generally 2-3X the rated capacity of the press brake at the bottom of the machines rated stroke.
A mechanical press brake is a good solution for punching applications as the shock of punching material is distributed with much easier due to the machines design. The major disadvantages to mechanical press brakes is that the ram must complete a full cycle, or stroke, and typically cannot be reversed during operation. This poses some safety concerns and operational limitations as well as provides for the possibility that the press brake can be “locked” into an over stroke situation where the ram has traveled too far into the die and the machine has flexed to its maximum and literally locked all movement. Hydraulic: Hydraulic pressure is applied through one or more cylinders to
force the ram of the machine down (on some models of Amada and Adira the hydraulics will force the bed up instead). Due to the hydraulic control of the machine the ram accuracy is more precisely controlled and adjusted for individual bend depths. Hydraulic machines can have one, two or four hydraulic cylinders for operation
Controls: A press brake, like any machine tool can benefit greatly from
computerization of the axis of motion. In the early years of mechanical press brakes there was only one axis of motion, the ram. Today there are press brakes available on the market with 12 or more programmable axis for precision metal forming. A CNC controller can be misunderstood in press brake applications. Typically CNC is associated with high production numbers. In actuality the CNC control on a press brake can be an enormous time saver for simple applications of 2-3 bends or more on part lots of 1-2 pieces.
The controllers today give the operator a graphical representation of the formed part in a simple to use format. By entering the material type, thickness, length and describing the bends and flange lengths the controller can set the positions and speeds of all the axis of the machine. This greatly reduces setup time, scrap rate and operator experience required for bending. The majority of controllable axis are found in the “backgage” which employs typically two or more “fingers” which act as material stops and supports which allow for accurate gaging of flanges.
Below is a listing and the description of the most common axis a press brake can control.
Y: Single Axis Ram Motion Up/Down, Typically a single cylinder hydraulic and all mechanical machines
Y1 / Y2: The Ram's Cylinders are Programmable on either side of the machine allowing for tilt or compensating for worn tooling in addition to the standard Up/Down Motion
X: This is the backgage or material stop which can be programmed to support the material directly perpendicular to the ram of the machine. The X-Axis moves this gage towards or away from the ram of the machine adjusting for shallower or deeper flange lengths
X1 / X2: Individually programmable backgage “fingers” or stops with the same
motion as described above. This would allow for complex part gaging and tapered flanges.
R: This is the axis that allows the backgage to move up and down allowing for a part to be gaged that has a down formed flange.
R1 / R2: The up and down movement of the backgage fingers in cases where they are independent if each other. This optional axis allows for gaging of extremely complex parts.
Z: Positioning of the stops or “fingers” of the backgage in the left to right axis of motion. This would best be utilized for stage bending (multiple press brake set-ups located or “staged” down the length of the press brake).
Z1 / Z2: Individually positioned gage “fingers” from left to right. This optional axis of motion is best used when bending large pans or rectangular pieces that have a disproportionate width to length. By the independent movement of the gage fingers the width and length can both be gaged more accurately by opening/closing the distance the gage fingers are from each other.
Other Possible Controllable Press Brake Axis:
CNC Crowning: Control or “pre-bending” of the bed of the machine to correct for worn tooling or flexing of the press brake frame under bending conditions.
Sheet Lifters: Lifting supports for large sheets of material that act in unison with the down stroke of the press brake allowing for single operator operation of a press brake when bending large sheets of material.
Robotic Interfaces: Robotic loading, operation and unloading of the Press Brake.
Types of Bending: There are two categories of bending sheet metals. Below is detailed the two types along with the advantages and disadvantages of each.
Bottom Bending: Bottom bending (shown in the graphic above) is the simple operation of the tool, or punch mounted in the Ram of the press brake forcing the workpiece down into the bottom of the die mounted on the bed of the press brake. The tool is typically forced slight closer to the die than the material thickness of the workpiece being formed. This over bending action “coins” the material and uniformly “seats” the bend.
The advantage to this type of bending is that the accuracy of the bend angle lies solely in the tooling used (punch and die) and the press brake itself has little bearing on it.
The disadvantage to this type of bending is that the forces required to “coin” the material or 3-4X that of air-bending. Another disadvantage is that tooling must be purchased top match the angle and thickness of every bend desired.
When press brakes were first developed the control of the ram's depth was very difficult and it was simply easier to purchase accurate tooling and “force” the angle desired. Today fewer than 10% of the fabrication facilities utilize this method of bending.
Air Bending: Air bending (Shown Above) is simply pressing the material down into a die (of typically 85 degrees angle) only far enough to achieve the desired angle plus any spring-back that the material might have once the punch is retracted. The material is never pressed to the bottom of the die and thus leaves a small gap of air between the material an die bottom thus the name “Air Bending.” Overall this is the preferred method for bending in a press brake.
The advantage to this type of forming method is that the die need only be changed as material thickness changes so that any angle from flat to 90 degrees can be achieved with the same punch and die tooling combination (Typically the die opening or width is 8X that of the material thickness). Also this type of bending requires far less tonnage to achieve.
The disadvantage to this type of bending is that angle accuracy is greatly affected by the material thickness and the ram depth will have to be adjusted as material thicknesses change from mill run to mill run of sheet stock.
Selecting a Press Brake
Tonnage: The first important factor is to determine the maximum thickness and hardness of the hardest material that will be bent. If you bend 0.125” Aluminum but also bend up to 10 Gage Stainless Steel than use the tonnages required for stainless steel when selecting your press brake. Contact us to assist you in selecting the proper tonnage of press brake required for your application but remember the 80/20 Rule - Select your machine based on the 80% of the work that you know you will be doing on it rather then the 20% that you might do as your machine may skyrocket in cost chasing that 20% of 'maybe' work.
Pit or No Pit: As press brakes increase in tonnage, or stretch out in width, they may require a 'pit' (more accurately described as a slot in the floor). The reason this relief in the floor is required is due the mechanical properties of bending that cause both the bed and ram to deflect under high tonnage. While adding mass to the ram simply makes the machine taller and does not affect its operability, adding mass to the bed would raise the working height of the machine beyond a comfortable level. Therefore the easiest and best way to counter these forces is to add more mass to the bed and put that mass below the floor. Although there are other mechanical opposing deflection devices such as hydraulics, crowning devices etc. the best method for keeping the machine and parts straight is to not let it bend in the first place(physics never lies) and thus a pit is actually preferred over flush floor mount machines in higher tonnages and/or wider widths.
Machine Length: The maximum part length that you wish to bend may require a press brake that is slightly bigger. This is due to the side frames of the machine that support both the bed and ram of the machine. Typically a 10' capacity press brake has only 8' clearance between the side frames. Although all manufacturers have a relief in the side frames this is typically only 4”, 6”, or 8” deep. If your application calls for a 10' long piece to be formed with a 12” Flange you may be best suited looking for a 12' overall bed length in your press brake.
Press Brake Tonnage Chart
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