The present invention is a cast iron pipe cutter. The cast iron pipe cutter includes a movable upper cutting tool and a rigid lower cutting tool. The upper cutting tool and lower cutting tool includes multiple cutting disc spaced an arc length apart. As the upper cutting tool is advanced downward by a hydraulic press, the cutting discs apply increasing pressure to the outer surface of a cast iron pipe until each cutting discs in the upper cutting tool and the lower cutting tool creates a fracture in the cast iron pipe. The multiple fractures created by the cutting discs amalgamate into a single fracture and the cast iron pipe is cut almost instantaneously.

A demolition shear and a piercing tip insert and nose configuration for a demolition shear which resists nose wear and resists retract forces exerted on the piercing tip insert in jamming situations and in the event of snagging of the piercing tip insert. The piercing tip insert includes first and second piercing tip halves, each half having an outer planar sidewall, a curved front wall extending laterally inward, and a bottom leg extending laterally inward defining a shearing edge and a piercing edge.

A power tool includes a cutting unit configured to perform a cutting action, and a cutting action input unit configured to turn the cutting action on and off. The cutting action input unit is configured to, when the cutting action input unit is turned on, cause the cutting unit to move in a direction of an end position of the cutting action, and when the cutting action input unit is turned off, cause the cutting unit to stop moving in a case where the cutting action has not ended at a time when the cutting action input unit is turned off, and move in a direction of a standby position at which the cutting unit was located prior to a start of the cutting action in a case where the cutting action has ended at the time when the cutting action input unit is turned off.

A slitter according to an embodiment of the present art includes: an upper knife disposed above the electrode plate to rotate, thereby cutting the electrode plate; and a lower knife disposed below the electrode plate to partially overlap the upper knife and rotate, thereby cutting the electrode plate together with the upper knife, wherein the upper knife includes: a first inner surface extending to be inclined from a tip formed at the lowermost end to the lower knife; and an outer circumferential surface extending to be inclined from the tip to an opposite side of the lower knife, wherein the first inner surface has an inclination at a first angle from a vertical line V that is perpendicular to a rotation axis that serves as a rotation center of the upper knife, and the outer circumferential surface has an inclination at a second angle from the vertical line.

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 tool for cutting a workpiece includes a first tool part, which has a first cutting edge formed by a plurality of first blade elements, and a second tool part, which is opposite the first tool part and has a second cutting edge. In order to cut the workpiece which can be arranged between the tool parts, the tool parts can be moved towards one another from an open position into a cutting position. A particular, separate receiving contour of the first tool part is associated with the relevant first blade element, which receiving contour corresponds to a particular external contour of the relevant first blade element, wherein the relevant first blade element is form-fittingly arranged at least predominantly in the associated receiving contour of the first tool part.

A pipe cutting machine, which includes a hole-type movable cutting die (6b), which is driven by a drive lever (7), by means of which circular movements with a continuously variable stroke (h) can be performed, an eccentrically shaped crank pin bearing (26) in an outer shaft (18), in which a crank pin (11), which is arranged eccentrically on a crank pin drive (23), is movably supported in relation to the outer shaft (18), the crank pin (11) being in operative connection with the drive lever (7).

A cutting method using a stamping press according to the present disclosure is a method to cut a workpiece that is configured from a first metal sheet and a second metal sheet joined at a weld portion and that has a heat-affected zone around the weld portion, in which the workpiece is cut using a punch. The punch includes a flat portion and a projecting portion projected more toward the workpiece than a flat portion of the punch. The workpiece is positioned with respect to the punch at a position such that the projecting portion starts cutting at least at one out of the heat-affected zone or the weld portion before the flat portion cuts the workpiece. The workpiece is then cut by moving the punch and a die relative to each other in this state of positioning so as to shear across the weld portion on the workpiece.

A coil slitting tool in the form of a rotary serrator knife for use on coil slitting machines includes a plurality of serration undulations disposed on one or more faces about the outer periphery. The rotary serrator knife tool may incorporate a concentrically located bore about an inner diameter for mounting on an arbor and may further incorporate a keyway. The rotary serrator knife may be formed from an assembly having, a central rotary disk about which mount one or more removable inserts including the serration undulation portion. The one or more removable inserts may include serration undulations on one side or two sides and mount substantially to the perimeter of a mounting disk by use of fasteners.

A pipe cutting machine with a pipe (3), from which a pipe section (3a) is to be cut to size, a stationary cutting die (1), a movable cutting die (2) which can be moved relative to the stationary cutting die (1), and a cutting mandrel (13) which is introduced into the pipe (3) and which comprises a stationary mandrel (14) and a mandrel (16) that can be moved relative to the stationary mandrel (14). The cutting mandrel (13) is arranged in a cutting position during a cutting process, and the cutting mandrel (13) is arranged in the pipe (3) in a floating manner. A magnetic coupling (6) is provided with a coupling stator (7) arranged outside of the pipe (3) and a coupling rotor (21) arranged on the stationary mandrel (14).