The main function of the Metal Shearing Machine is to perform metal processing

The main function of the Metal Shearing Machine is to perform metal processing

Metal Shearing Machine is a machine that uses one blade to reciprocate linear motion relative to the other blade to shear the sheet. By means of a moving upper blade and a fixed lower blade, a reasonable blade gap is used to apply shearing force to metal plates of various thicknesses, so that the plates can be broken and separated according to the required size. The shearing machine is a kind of forging machinery, and its main function is the metal processing industry. The products are widely used in aviation, light industry, metallurgy, chemical industry, construction, shipbuilding, automobile, electric power, electrical appliances, decoration and other industries to provide the required special machinery and complete sets of equipment.

The upper blade of the Metal Shearing Machine generates a horizontal thrust T during the shearing process. This horizontal thrust is generated by the horizontal component of the shearing cylinder thrust and the steel plate bending and shearing horizontal component during the shearing process. The generation mechanism is complex. It is estimated by experience to be roughly T=0.3P, the force of the machine frame and the force of the tool holder are the acting force and the reaction force. The geometric structure of the tool holder can simplify its force model.
The stress point in the structure of the tool holder is on the blade. Due to the particularity of the material used in the tool holder, the stress at the blade is not considered here. Consider only the remaining parts composed of ordinary carbon steel, and the stress concentration positions are at the position of the oil cylinder of the wing plate and the missing hole of the top plate, as well as the connection between the top plate and the upper side plate. The vertical plate and the bottom plate bear greater force, but the steel plate used in its design is also thicker than the other steel plates, and the stress is not large when the direction of the force is reached.

The pressing device is a very important auxiliary device in the shearing process. There will be different devices in different types of shears, including the gradual pressure type and the constant pressure type. The shearing machine analyzed in this paper is a pressing device with a constant pressure of a hydraulic cylinder. When calculating the required pressing force, it is sufficient to ensure that the rated thrust of the cylinder is not less than the pressing force. When considering the pressing force, the first thing to ensure is that the pressing force can prevent the plate from lifting during the shearing process. At the same time, the pressing force is also related to the thickness and width of the plate to be cut and the type of shearing machine.

The performance indicators of Metal Shearing Machine have two points: one is that the stress of the other parts of the shearing machine except the blade shall not exceed the allowable stress of ordinary carbon steel, that is, it shall not exceed 235MPa; the second is that the horizontal deformation of the blanking frame shall not exceed the thickness of the sheared steel plate. 1/20 of it, that is, it must not exceed 0.6mm. Therefore, the focus of the structural analysis of the shearing machine is to analyze the stress concentration part of the shearing machine, and the strain part needs to be clearly understood in the finite element calculation.