A metal plate shearing apparatus, a control method thereof, and a metal plate shearing method are disclosed. The metal plate shearing apparatus includes a lower pad, an upper pad installed on the lower pad to ascend and descend and configured to press and fix an upper surface of a metal plate of a cut target placed on the lower pad, a shear blade installed adjacent to one side surface of the upper pad to ascend and descend and configured to shear a cutting line of the metal plate by descending, and a heating device configured to locally heat the cutting line of the metal plate.

A metal plate shearing apparatus, a control method thereof, and a metal plate shearing method are disclosed. The metal plate shearing apparatus includes a lower pad, an upper pad installed on the lower pad to ascend and descend and configured to press and fix an upper surface of a metal plate of a cut target placed on the lower pad, a shear blade installed adjacent to one side surface of the upper pad to ascend and descend and configured to shear a cutting line of the metal plate by descending, and a heating device configured to locally heat the cutting line of the metal plate.

A power tool accessory includes a housing having a rear end portion and front end portion; an input shaft at least partially received in the rear end portion, extending along an axis, and configured to be coupled to a tool holder of a rotary power tool; a threaded shaft received in the housing and rotationally driven by the input shaft; a blade holder configured to move along the axis upon rotation of the threaded shaft; and a cutting blade configured to be retained by the blade holder. A workpiece holder is coupled to the front end portion of the housing and is configured to hold an elongated member. Upon rotation of the input shaft, the threaded shaft rotates, causing the blade holder to move axially toward the front end portion of the housing, causing the blade to move at least partially into the workpiece holder to cut the elongated workpiece.

A scrap cutter is provided in a subsequent stage of the press machine and cuts the scrap material fed from the press machine. The scrap cutter includes: a slide configured to be driven to reciprocate in the vertical direction by a Scotch yoke mechanism; an upper blade attached to the slide; and a lower blade attached to a frame and configured to cut the scrap material in cooperation with the upper blade. A shear angle formed by the upper blade and the lower blade has an angle that gradually decreases from a start of cutting of the scrap material toward an end of cutting to allow the driving torque of the crankshaft of the Scotch yoke mechanism to be constant from the start of cutting to the end of cutting in cutting a scrap material of a cutting capacity limit.

A scrap cutter is provided in a subsequent stage of the press machine and cuts the scrap material fed from the press machine. The scrap cutter includes: a slide configured to be driven to reciprocate in the vertical direction by a Scotch yoke mechanism; an upper blade attached to the slide; and a lower blade attached to a frame and configured to cut the scrap material in cooperation with the upper blade. A shear angle formed by the upper blade and the lower blade has an angle that gradually decreases from a start of cutting of the scrap material toward an end of cutting to allow the driving torque of the crankshaft of the Scotch yoke mechanism to be constant from the start of cutting to the end of cutting in cutting a scrap material of a cutting capacity limit.

A packing strap length cutting device includes a main body and a control device. The main body has a first frame and a second frame. A strap pulling unit, a calculation unit and a sensing unit are electrically connected to the control device. The strap pulling unit is connected to a strap connecting unit. Thereby, a packing strap can be automatically pulled out a predetermined length through the strap pulling unit, and then the strap cutting unit is driven by a driving member of the strap pulling unit to cut the packing strap in the predetermined length, assisting a user in completing the cutting operation quickly.

A table shear may include a clamp and a shearing mechanism, the shearing mechanism supported by the clamp. The shearing mechanism may include a fixed lower shear blade, a lower shear blade backup plate supporting the fixed lower shear blade, a moveable upper shear blade and a shear compression cylinder. The shear compression cylinder abuts the movable upper shear blade.

A table shear may include a clamp and a shearing mechanism, the shearing mechanism supported by the clamp. The shearing mechanism may include a fixed lower shear blade, a lower shear blade backup plate supporting the fixed lower shear blade, a moveable upper shear blade and a shear compression cylinder. The shear compression cylinder abuts the movable upper shear blade.

A shearing method of a plate-shaped workpiece for applying a shear force in a thickness direction of the plate-shaped workpiece includes: a step for starting applying the shear force on the workpiece with a clearance between action points in a surface direction orthogonal to the thickness direction of the workpiece; a step for applying the shear force after the start of applying the shear force until a fractured surface is created in the workpiece; and a step for increasing the clearance depending on a deformation of the workpiece in the thickness direction after starting applying the shear force until the fractured surface is created in the workpiece.

A shearing method of a plate-shaped workpiece for applying a shear force in a thickness direction of the plate-shaped workpiece includes: a step for starting applying the shear force on the workpiece with a clearance between action points in a surface direction orthogonal to the thickness direction of the workpiece; a step for applying the shear force after the start of applying the shear force until a fractured surface is created in the workpiece; and a step for increasing the clearance depending on a deformation of the workpiece in the thickness direction after starting applying the shear force until the fractured surface is created in the workpiece.