Many people have doubts about why hydraulic shearing machines are divided into swing beam shear (fixed angle shear) and guillotine shear (variable angle shear).
What is the difference between the hydraulic swing beam shear and guillotine shear?
Why most of the users prefer the guillotine shears?
Compared with the hydraulic swing beam shear, what are the advantages of the hydraulic guillotine shear?
Today, I will tell you about the difference between the swing beam shearing machine and the guillotine shearing machine.
The table below lists the key differences between QC12 series swing beam shear and QC11 series hydraulic guillotine shear:
|Difference||QC12K/Y Series||QC11K/Y Series|
|Hydraulic Swing Beam Shears||Hydraulic Guillotine Shears|
|1||Blade carrier cutting movement||– Unipivot support，lever principle;|
– Do arc-shaped curvilinear motion around the rear fulcrum.
|– Three-point support rolling guide (Lower eccentric shaft, front support shaft，upper eccentric shaft)|
– Do linear vertical motion.
|2||Shear force||– Hydraulic oil cylinder fixed in oblique direction;|
– 75% acting force, 25% loss.
|– Hydraulic oil cylinder do linear vertical motion;|
-100% hydraulic pressure acting on cutting edge.
|3||Blade style||– Top blade in prismatic shape, can only use two bevel angle cutting edge;|
– Lower blade in rectangular shape, four cutting edge can be used.
|– Both upper and lower blade are in rectangular shape;|
– All four cutting edge can be used.
|4||Cutting angle adjustment||– Fixed cutting angle and blade carrier angle;|
– Can only cut in specific angle whatever the thickness of the plate.
|– Adjustable cutting angle, different cutting angles are applied for cutting plate with different thickness.|
– Adopt smaller cutting angle can effectively reduce the distortion of sheet metal, and increase cutting speed;
– Can also increase the shear angle to increase the shear force.
|5||Lubrication point||Bevel gears are heavily worn and require frequent lubrication to increase service life.||Most use self-lubricating spherical plain bearings, basically don’t need to manually lubricate.|
|6||Blade carrier return device||Nitrogen return cylinder, easy to leak, often need to repair.||The bladder-type accumulator returns are stable and reliable.|
|7||Use range||Ordinary small and medium workpieces, common requirements for the cutting surface.||Large and medium-sized ultra-long sheet shear, require high precision for the cutting surface.|
|8||Backstop structure (optional)||– 500W AC motor + universal connection twisted shaft;|
– Easy to cause gaps, no spring buffer, no retract function.
|– Inverter + speed motor + encoder + electronic digital display;|
– Stepless speed regulation, low noise, spring retraction and buffer function.
|9||Fuel tank (optional)||If ordinary plates are not handled, the long time, the easier to rust, causing the hydraulic parts to block and wear.||The overall plating treatment, no rust, not easy to react with the oil.|
Both of the blade clearance of the swing beam shear and guillotine shear is 0.04 mm.
However, the clearance of the bearing connection between the swing arm and the pendulum body of the swing beam shearing machine cannot be completely eliminated.
The accuracy errors between gaps and blade edge clearance are generally above 0.1 mm.
Therefore, the accuracy of the swing beam shearing machine is theoretically twice worse than the guillotine shearing machine.
The rear guide rail of the guillotine shearing machine is pressed by the bearing with the compression spring pad on the back, so that there is no gaps between the front and rear guide rails.
The accuracy of the gap between the clearance and the blade edge gap is kept below 0.04 mm, so that the shear material can be made smoother and no burrs.
Since the tool holder of the swing beam shearing machine is curved, therefore, it is an arc point contact to ensure the straightness of the shear material.
The guillotine shearing machine guarantees the straightness of the shearing material with the straight of the tool holder, and is more precise.
In the middle of the swing beam shearing machine, the blade back-off phenomenon is very serious, and some of the cutting materials have burrs. This situation cannot be avoided.
When cutting a sheet with a thickness of less than 20 mm, the shear angle of the swing beam shearing machine can not be adjusted, so the material being cut has a twisted twist. The narrower the cut material, the larger the distortion.
The guillotine shearing machine can achieve stepless adjustment of the shear angle.
The cut sheet is not easy to be distorted and deformed to ensure the machining accuracy of the workpiece.
More importantly, the shear force is stronger after the shear angle is increased.
The hydraulic swing beam shearing machine can not use all the 4 edges of the blade to cut metal plate due to the blade moving of the swing shearing machine is curved.
Therefore, only the diamond-shaped cutting edge can be used for the double-sided cutting.
The tool holder of the guillotine shearing machine moves up and down linearly. Both of it’s upper and lower blade can be cut with 4 edges.
Therefore, the service life of the blade on the guillotine shearing machine is twice as high as that of the swing beam shearing machine.
The hydraulic guillotine shearing machine does not use nitrogen to return the blade, which avoids the inconvenience caused by air leakage.
The hydraulic cylinder used is double-acting cylinder.
In comparison, there are still many unsolvable problems in the design of the swing beam shears.
- It’s difficult to guarantee the strength of the blade holder with a width of more than 3200mm;
- It is difficult to fill the lubricating oil of its built-in cylinder semi-circular block;
- The cylinder is not easy to repair;
- The rack is unevenly stressed;
- It is difficult to adjust the accuracy of the blade gap;
- The material with a shear length of less than 20 mm cannot use the back gauge device.
- The working principle of the swing beamshearing machine limits that it cannot cut thick plates. For cutting the metal plate with over 8mm thickness, the guillotine shearing machine must be selected.
Nowadays, the famous shearing machine manufacturers all over the world are mainly producing hydraulic guillotine shearing machine, and the price is slightly higher.
Compared with the hydraulic swing beam shearing machine, the hydraulic guillotine shearing machine has the advantages of high shearing precision, adjustable shear angle and long service life of the cutting edge.
To put it simply, the guillotine shears are equivalent to the second-generation hydraulic shears.
It can also be said that it is an upgraded version of the swing beam shear.
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