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  • Hydraulic system of the guillotine shear

Press Brake FAQs

  • How to adjust the size of the press brake?
  • How to adjust the angle of the press brake?
  • How to compensate deflection of press brake machine?
  • The press brake can’t go up and down. What’s the matter?
  • How to bend an arc with a press brake?
  • Comparison between grating ruler and magnetic grating ruler of press brake
  • Up and down moving type of press brake, which is better?
  • What is the problem that the downward speed of the hydraulic press brake suddenly slows down during operation?
  • The bending angle of the press brake is different
  • How long to change the hydraulic oil of the press brake?
  • List of hazard sources and risk assessment form of press brake
  • List of minimum bending radius of common metal materials
  • How many press brake controllers are there? How to choose?
  • How to choose between open loop and closed loop press brake?
  • What is a three cylinder press brake?
  • What is a four cylinder press brake?
  • What is the difference between three cylinder press brake and two cylinder press brake?
  • Why can’t the press brake machine return?
  • What are the functions of three motors of ordinary press brake machine?
  • What are the functions of the three relief valves on the press brake?
  • What if the press brake doesn’t go up when it comes down?
  • The press brake is normal up and down, but it is not pressurized!
  • Where does the number of backgauge axis (X,Y,Z,R) of press brake refer to?
  • How does the X-axis of press brake return to the origin?
  • Why the Y-axis of press brake does not return?
  • How many times to bend a large arc and how to calculate the bending angle?
  • How to adjust the stroke of the press brake?
  • The pressure at both ends of the hydraulic press brake is not the same. How to adjust it?
  • The cylinder stroke on both sides of the press brake is different. How to adjust it?
  • How to program CNC press brake?
  • How to adjust the downward speed of the press brake?
  • How to calculate the size and angle of sheet metal bending?
  • How to calculate the nominal pressure required by the press brake according to the thickness and length of the steel plate to be bent?
  • How to calculate the unfolded dimension of sheet metal bending?
  • How is the bending coefficient of sheet metal calculated
  • What is the relationship between bending factor and plate thickness, bending angle and bending radius?
  • How to calculate the bending coefficient of sheet stainless steel?
  • How to calculate the tolerance of sheet bending machine?
  • What is the reason why the middle of the folded workpiece is bent?
  • Why can’t the hydraulic press brake go up and down?
  • How can the angle of the press brake be adjusted if it cannot be pressed at right angles
  • How to fold different angles with a press brake?
  • How to disassemble the oil cylinder of the press brake?
  • The press brake cannot be started
  • How to eliminate the bending indentation of stainless steel press brake die
  • How to adjust the downward speed of the press brake machine?
  • What’s wrong with the unstable pressure of the press brake?
  • Why can’t the press brake machine rise?
  • What about the deformation of the press brake ram?
  • How does press brake bend a cone?
  • How to use press brake to fold a large circular arc?
  • What’s the matter with the slow down speed of the press brake?
  • What if the downward speed of the press brake is fast?
  • The downward speed of the hydraulic press brake becomes slow and the upward jitter!
  • What happened to the hydraulic oil leakage on one side of the press brake?
  • The two cylinders of the press brake are not synchronized
  • What if the workpiece interferes with the press brake machine?
  • Can the press brake machine fold the U-groove?
  • Environmental requirements of CNC press brake
  • What happened to the abnormal noise of the press brake oil pump motor?
  • A simple method for electric heating of hydraulic oil of press brake
  • What’s wrong that the press brake punch can’t lower to the bottom?
  • How to select the size of the lower V groove for sheet metal bending according to the plate thickness
  • How to break the lock of the press brake?
  • How to determine the bending radius of sheet metal?
  • How to solve the problem that the press brake pressurizes too slowly? How to pressurize quickly
  • What hydraulic oil does the press brake use?
  • How many years to change the press brake hydraulic oil?
  • What determines the sheet metal bend radius?
  • Stress relief of stainless steel 304 after bending
  • What are the corresponding protective devices of the press brake?
  • How to adjust CNC press brake?
  • What is the reason for the noise of press brake?
  • How to solve the oil leakage of oil cylinder of the press brake?
  • How to repair the scratches on mirror stainless steel?
  • How much can the bending tolerance of the press brake be controlled?
  • What is the minimum bending size of the press brake?
  • Where is the pressure relief after pressurization of the press brake adjusted?
  • How to choose electro-hydraulic servo synchronous cnc press brake?
  • How to fold a semicircle with a pres brake?
  • How is the inner radius of sheet metal bending determined?
  • How to calculate the bending radius of sheet metal?
  • How to set bending radius and bending deduction in SolidWorks?
  • The most complete sheet metal bending allowance table
  • How to set the K factor, bending deduction, bending allowance and bending calculation in SolidWorks? What’s their relationship?
  • How does the press brake accurately control the bending angle?
  • What is the reason why the blade of press brake can’t rise?
  • Which axes do the 3 + 1 axis and 4 + 1 axis of the press brake refer to respectively?
  • What does the Y value limit of press brake mean?
  • Function of time relay in press brake circuit
  • What is the difference between electro-hydraulic servo press brake and torque synchronous press brake?
  • What hydraulic pump is generally used for press brake?
  • How do you know what material the lower die of the press brake is?
  • When the press brake steps up, it cannot stop and automatically slides down
  • How to understand the N + 1 axis of press brake machine?
  • How to change the tool of press brake?
  • What material is generally used for press brake dies? What is the hardness?
  • Do you need to grind the top punch of press brake?
  • How to level the tools of press brake?
  • What is the problem that the press brake tools are not in a straight line?
  • How to repair the crack of stainless steel bending tool?
  • How to select the material of press brake die?
  • What is the problem of automatic tool drop of ordinary press brake?
  • How does the press brake go down slowly?
  • What is the difference between the acute punch and gooseneck punch of press brake?
  • The press brake tool has dents. How to repair it?
  • What is the quenching hardness of general press brake die?
  • Calculation formula of press brake die price
  • What is the general angle of the press brake dies?
  • How to select arc radius punch and die of press brake?
  • How to calculate the bending angle of the press brake?
  • What are the factors that determine the service life of press brake die?
  • How to select the top punch of the press brake?
  • Golden section size of press brake dies
  • Anti rust treatment of press brake dies
  • Comparison chart of press brake die combination
  • The press down pressure of the press brake machine is not enough, but the rising pressure is normal

Press Brake Hub

  • What is CNC press brake and it’s working principle
  • Brief introduction of synchronous system of CNC press brake
  • Workpiece bending diagram of press brake
  • Installation of CNC press brake
  • Operation of CNC press brake
  • Adjustment of bending parameters of CNC press brake
  • Bending accuracy of CNC press brake
  • Safety protection of CNC press brake
  • Press brake punch and die installation
  • Adjustment of CNC press brake
  • Hydraulic oil of CNC press brake
  • Lubrication of CNC press brake
  • Repair and maintenance of CNC press brake
  • Main structure of CNC press brake
  • Explanation of CNC press brake axis
  • Operating environment of press brake
  • Press brake punch and die selection
  • Adjustment of press brake’s mechanical part
  • Causes and solutions of common faults of press brake

Guillotine Shear Hub

  • Purpose and characteristics of the guillotine shear
  • Main structure of the guillotine shear
  • Hydraulic system of the guillotine shear
  • Lifting and installation of the guillotine shear
  • Lubrication of the guillotine shear
  • Operation and adjustment of the guillotine shear
  • Safety and maintenance of the guillotine shear
  • Guillotine Shear: Common Faults and Troubleshooting
  • Accuracy check of the guillotine shear
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  • Hydraulic system of the guillotine shear

Hydraulic system of the guillotine shear

Table of Contents
  • Working principle of hydraulic system
  • Fault causes and troubleshooting of hydraulic system
    • Noisy oil pump
    • The oil circuit cannot build up pressure, and the blade holder does not move
    • The shear angle cannot be adjusted
    • The tool holder goes down and the pressing oil cylinder does not act

Working principle of hydraulic system #

The hydraulic system of the machine (see Figure below) is mainly composed of motor 3, oil pump 2, pressure cylinder 4, main cylinder 5, auxiliary cylinder 6 and valve stack (Bosch-Rexboth).

Hydraulic schematic diagram

Hydraulic schematic diagram

Hydraulic system of the guillotine shear

The whole system is reasonable.

The system pressure is controlled by the electromagnetic proportional overflow valve 30, and the pressing pressure of the pressing cylinder is controlled by the pressure reducing valve 50 (its change can be controlled by shifting the gears 0, I and II of the pressure adjustment switches installed on the electric cabinet).

The main action process of the machine is as follows:

Tool holder down:

After the oil pump is started, when the electromagnets Y1, Y2 and Y3 are powered on, the pressure oil of the oil pump is divided into two ways.

One way enters the pressing oil cylinder 4 through valves 40, 50 and 140 to drive the piston rod to move downward against the spring force;

The other way enters the upper chamber of main cylinder 5 through valve 60, the oil in the lower chamber of main cylinder 5 enters the upper chamber of auxiliary cylinder 6, and the oil in the lower chamber of auxiliary cylinder 6 flows back to the oil tank through valve 80 and valve 60, which drives the tool holder down.

Carriage return:

When the tool holder reaches the bottom dead center, the electromagnets Y2 and Y3 are powered off and Y4 is powered on.

The oil of the pressing cylinder flows back to the oil tank through valve 140 under the action of spring force.

The pressure oil of the oil pump enters the lower chamber of auxiliary oil cylinder 6 through valve 60 and valve 80, the oil in the upper chamber of auxiliary oil cylinder 6 enters the lower chamber of main oil cylinder 5, and the oil in the upper chamber of main oil cylinder 5 flows back to the oil tank through valve 60 to drive the tool holder return.

Shear angle reduction:

Changing the shear angle is to change the amount of oil in the lower chamber of main cylinder 5 and the upper chamber of auxiliary cylinder 6.

When the oil pump is rotating, when the electromagnets Y1 and y6 are powered on, the pressure oil of the oil pump enters the series cavity of the main cylinder 5 and the auxiliary cylinder 6 through valves 100, 70, 150 and 90.

Because the oil in the upper cavity of the main cylinder 5 is sealed, the pressure oil can only push the piston rod of the auxiliary cylinder 6 down, so as to reduce the shear angle.

The oil in the lower chamber of auxiliary cylinder 6 flows back to the oil tank through valves 80 and 60.

Increase in shear angle:

When the electromagnets Y1 and Y5 are energized, the pressure oil of the oil pump enters the lower chamber of the auxiliary oil cylinder 6 through valves 100, 70 and 110.

Similarly, because the oil in the upper chamber of the main oil cylinder 5 is sealed, the pressure oil can only push the piston rod of the auxiliary oil cylinder 6 upward, thereby increasing the shear angle.

The oil in the series chamber flows back to the tank through valves 90, 150 and 70.

Fault causes and troubleshooting of hydraulic system #

Noisy oil pump #

Causes

1. Pump parts damaged
2. Foreign matter at oil suction port
3. The oil pump is empty due to air leakage in the oil suction pipeline of the oil pump or low liquid level in the oil tank;
4. The oil temperature is too low and the oil viscosity is too high, resulting in excessive oil absorption resistance;

Solutions

1. Replace the pump
2. Check the oil suction port and remove foreign matters
3. Replace the seal of the air leakage part or add enough oil in the oil tank;
4. Replace with low viscosity oil;

The oil circuit cannot build up pressure, and the blade holder does not move #

Causes

The valve core of valve 10 or 60 is stuck or roughened by sundries and does not act.

Solutions

Inspection, disassembly and washing.

The shear angle cannot be adjusted #

Causes

The valve core of valve 10 or valve 70 is stuck or roughened by sundries and does not act

Solutions

Inspection, disassembly and washing.

The tool holder goes down and the pressing oil cylinder does not act #

Causes

The valve core of valve 140 is stuck or roughened by sundries and does not act

Solutions

Inspection, disassembly and washing.

 

 

Related:

  • Operation and adjustment of the guillotine shear
  • Main structure of the guillotine shear
  • Lifting and installation of the guillotine shear
  • Safety and maintenance of the guillotine shear
  • Accuracy check of the guillotine shear
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Updated on October 5, 2021
Main structure of the guillotine shearLifting and installation of the guillotine shear

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Table of Contents
  • Working principle of hydraulic system
  • Fault causes and troubleshooting of hydraulic system
    • Noisy oil pump
    • The oil circuit cannot build up pressure, and the blade holder does not move
    • The shear angle cannot be adjusted
    • The tool holder goes down and the pressing oil cylinder does not act
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