Abstract: Machine for punching a box-shaped element, or suchlike, including at least one punching head provided with at least one punch and translatable in a direction toward or away from a substantially vertical side of the box-shaped element and at least one counter-head that contrasts the punching head, the side of the box-shaped element is positioned during use between the punching head and the counter-head, the counter-head is configured to be inserted inside the box-shaped element and to rest against an internal surface of the side in order to maintain the box-shaped element in position on a work plane, and the punching head is translated toward the counter-head in the direction so as to perforate the side by means of the punch and make at least one through hole therein.

Abstract: In the present invention, in a piercing punch and a burring punch which are shaft members having a first axis line as the center axis lines and are provided so as to be movable along the first axis line, first, after prepared holes having the first axis line as the center axis lines with respect to the first wall portion and the second wall portion are formed using the piercing punch, burring holes having the first axis line as the center axis lines with respect to the first wall portion and the second wall portion are formed using the burring punch.

Abstract: The invention relates to a method for producing slots (11) in a tube wall (10), wherein a single die plate (2) provided with notches (20) is pushed into the tube (1) and punches (5) arranged in a row pierce the tube wall from the outside and in the process produce the slots (10), whereupon the die plate (2) is rotated about its longitudinal axis out of a working position and into a withdrawal position and is pulled out of the tube (1). Economical production of the slots in tubes having different cross-sectional shapes is achieved according to the invention in that during the slotting operation the tube wall (30) is gripped from the outside and held and is stabilized from the inside against two opposing support strips (25) by way of the die plate (2).

Abstract: A trim die for sheet metal or other materials is provided to trim the entire circumference of a drawn part. The trim die includes a trim plate with a connected trim punch moveably mounted in a stripper plate. Cam punches with cam lobes engage cam followers on the trim plate to impart motion to the trim die. The trim die of the present invention minimizes displacement of the part to be trimmed, including the excess material, and therefore is compatible with progressive dies. The corresponding method of trimming a part is also provided.

Abstract: The present invention relates to a process and a device for perforating a metallic piece of elongated shape and with straight generatrix, with a view to obtaining, in several successive passes, a pattern which extends over a considerable part of the length of said generatrix and which is constituted by a large number of adjacent perforations in the lateral wall of this piece, said process consisting in repeating at least one elementary pattern which comprises a part of said perforations and which extends over the whole height of the pattern to be made. According to the invention, this elementary pattern is made in one pass, two adjacent elementary patterns being made during different passes. The invention is more particularly applicable to the precision-production of technical and decorative perforations.

Abstract: Mechanism for and method of shifting cam mechanisms in a press for pressing workpieces with depressed portions comprise a combination of a first single cam mechanism for retracting a die by a distance equal to the depth of a depressed portion of a workpiece and a second single cam mechanism for pressing the workpiece to work the depressed portion. Said single mechanisms are provided between a bottom form and a top form being vertically movable toward and away from said bottom form. Said first single cam mechanism is composed of a pad positioned downwardly of said top form, a pin mounted on and extending downwardly from said pad, a first cam follower mounted on said bottom form and movable in response to depression of said pin, and a second cam follower mounted on said bottom form. Said second single cam mechanism has a punch for punching the depressed portion of the workpiece and is composed of a fixed cam mounted on the top form, and a third cam follower mounted on said bottom form and supporting said punch.

Abstract: A piercing die assembly for punching a plurality of radially extending holes in a tubular member. The assembly having an open end for receiving a tubular member to be punched. The die assembly having structure for supporting the tubular member in a pre-punching position including radially inner and outer die walls for backing up inner and outer wall surfaces of the tubular member to be punched. A plurality of spaced radially movable punch assemblies are operatively connected with the die structure and having a series of radially movable punches. The punch assemblies having bearings positioned at radially outer ends of the punches and each bearing and its associated punch being radially movable simultaneously together. A vertically movable ring-shaped actuator member is positioned radially outwardly of the punches and is movable axially from a pre-punching position to a post-punching position.

Abstract: An apparatus to simultaneously punch a series of louver holes in a tubular workpiece. The apparatus having a series of punches angularly spaced around the workpiece, which punches are caused to reciprocate by the engagement thereof by a series of inclined surfaces of a rotatable member located around the workpiece. The apparatus further includes gripping means to hold the workpiece during punching operations and to move the workpiece in between successive punching operations.