Guillotine Shear Structures Explored: Efficiency in Every Cut | MachineMFG

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Guillotine Shear Structures Explored: Efficiency in Every Cut

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The shearing machine is mainly composed of a frame, tool holder, rear stop, rear material support, hydraulic system, material pressing device, and electrical system.

Frame

The machine adopts a steel plate welding structure. The left and right wall panels, workbench, pressing beam, and crossbeam are welded into a frame structure, which provides good rigidity.

The left and right oil cylinders are respectively installed on the supports of the left and right wall panels and the upper part of the pressing beam. The lower blade is fixed on the workbench.

The left side of the workbench is equipped with a lateral material retaining mechanism (with a front material retaining mechanism), and the stop is positioned and counted with a ruler.

The perpendicularity between the lateral stop and the lower knife edge can be adjusted using the set screw under the support arm.

Tool holder

The tool holder body is a welded assembly with sufficient rigidity.

A three-fulcrum roller guide rail is used to support the tool holder, which is connected to the piston rod of the oil cylinder and makes a reciprocating linear motion between the guide rails.

The rear two fulcrums are fixed on the wallboard, and the front fulcrum is the disc spring roller support, which is fixed on the pressing beam to ensure that the tool holder always fits on the rear two fulcrums.

The blade gap adjustment mechanism drives the synchronous shaft for the worm gear reducer, which drives the eccentric rotation of the upper fulcrum. This allows the tool holder to rotate slightly on the lower fulcrum, thereby changing the blade gap value.

Rear stop

The rear stopper is installed on the bottom plate of the tool holder and moves up and down with the tool holder.

The rear stopper is driven by a servo motor and moves back and forth on a linear guide rail through the synchronous belt and ball screw pair.

The entire material retaining device is controlled by the numerical control system, providing accurate and reliable positioning and convenient operation. The adjustment range of the rear retaining material is 10-1050mm.

Note: When positioning the sheet and pushing it to the retaining plate, lean lightly against the retaining plate to ensure positioning accuracy. Otherwise, it will affect the accuracy of positioning.

Rear support

The rear support is installed at the back of the workbench frame and primarily serves as an auxiliary positioning device to prevent the plate from sagging and causing size errors.

The rear support is mainly composed of an air cylinder, synchronous shaft, and support arm.

Before shearing, the support arm rises. After positioning, the support arm turns over and falls down, allowing the sheared sheet material to slide down along the surface of the shield.

The rear support range is 500-3050mm in width and 350-1050mm in length for the sheared plate.

Hydraulic system

The hydraulic system is installed on the support at the rear of the frame and is mainly composed of a main motor, oil pump, valve stack, and oil tank.

The Bosch-Rexroth integrated hydraulic valve stack is adopted to enhance the stability and reliability of the hydraulic system.

American EMB high-pressure hose assemblies and ferrule joints are adopted to improve the cleanliness of the hydraulic oil.

Pressing device

The material pressing device is mainly composed of a group of material pressing cylinders installed on the material pressing beam of the frame.

After oil is fed into the pressing cylinder, it acts on the plunger rod, making it move downward against the spring force and compress the sheet metal. After shearing, the plunger rod is reset by the spring force.

The pressing force increases with the thickness of the sheared sheet.

The pressing force of the machine is set to three gears, 0, I, and II, from small to large. Users can adjust it according to the actual situation of the material and thickness of the sheared sheet.

When cutting a long and narrow sheet with the maximum plate thickness, the pressing force should be adjusted to the maximum, and at least 2-3 pressing cylinders should press the sheet before cutting.

A fixed protective fence is installed in front of the pressing cylinder to ensure that the operator’s fingers do not extend into the knife edge while operating the machine.

Electrical system

The electrical system adopts the special CNC system for the Dac360 plate shearing machine from Delem company in the Netherlands.

The numerical control system and all operational buttons are installed on the electrical cabinet on the left wall panel, and a footswitch is also provided.

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