What are the shear resistance of hydraulic shears? How does hydraulic shearing machine use? What are the operating rules for hydraulic pendulum shears?
Shear resistance of hydraulic shears
In general, the shear resistance of hydraulic shears is related to factors such as steel sheet raw material, shear temperature, shear rate, blade edge shape, Hydraulic Shearing Machine cutting blade clearance and relative cutting depth. Specifically,
Metal properties: the higher the strength limit of the material, the greater the shear resistance, but the lower the plasticity.
Shear temperature: mainly refers to the temperature of steel plate shear, the higher the temperature, the smaller the shear resistance, the relative depth of the larger cut.
Deformation speed: theoretically, the deformation speed is proportional to the shear rate, and shear resistance is also proportional to the deformation speed, but in the cold shear, the deformation speed can not be considered.
Knife blunt radius: the greater the radius of the knife blunt, the greater the shear resistance.
Second, the use of hydraulic shearing machine
1. should be idle several cycles to ensure that under normal circumstances, can be cut into different thickness of the sheet.
2. When cutting test, should adjust the different thickness of the blade and the gap to ensure its durability.
3. In the cutting process should open the pressure gauge switch, observe the oil, the shear stress should not be greater than 20MPa, the general factory set the pressure of 20-22MPa.
4. When the machine is running, there should be no noise, if noisy, should immediately stop inspection, scissors blade operation temperature should be less than 60 degrees.
Third, the hydraulic pendulum shear machine operating procedures
The operating procedure of the hydraulic tilting shears is divided before, during and after work.
Before work
Before the air run test, make sure that the drive is normal, the oil in the hydraulic system tank is sufficient, and the system is closed.
Work in
(1) the thickness of the shear plate material, should be based on "limit strength and thickness of the plate diagram" to determine.
(2) the gap between the cutter plate should be adjusted according to the thickness of the metal plate, but not more than 1/30 plate.
(3) edge of the blade should be kept sharp, such as the emergence of blunt or crack, should be replaced.
3. After work
(1) The knife on the disc should be placed in the lower position.
(2) to clean, make sure the machine has all stopped.
The cutting board uses safety rules
1, before starting, should check the Ministry of lubrication, Hydraulic Shearing Machine tightening the situation, the knife may not have a gap. Joint punching machine
2, the thickness of shear steel plate shall not exceed the provisions of the cutting plate machine capacity. When the slabs are cut, they should be pressed against a sheared plate. When the vertical pressing device is dropped, it can be pressed and cut. Hydraulic punching machine
3, should be based on the thickness of the shear plate, adjust the upper and lower cutter clearance, cutter clearance shall not be greater than 5% of the thickness of the plate, the ramp should not be greater than 7%, adjust the application of hand rotation and empty running test.