Abstract: A broach has a main body of a cemented carbide material. On this main body, a front grip portion, a cylindrical portion following the front grip portion and provided with a plurality of guide parts in its outer periphery, a broach cutting edge portion following an end of the cylindrical portion and having a number of cutting edges, and a cylindrical extension following the broach cutting edge portion and having a maximum outer periphery dimension to such an extent that the extension does not interfere with a work are integrally provided. On an end surface of the cylindrical extension, a load receiving shoulder is formed, which leads to a rear grip portion including a small-diameter part and is orthogonal to or inclined with respect to a broach axis. The load receiving shoulder has a sufficient area to bear a cutting load. A broaching machine grips the rear grip portion with its load receiving surface abutting against the load receiving shoulder of the cemented carbide broach.

Abstract: A vertical internal push broaching machine comprises a machine column and a workpiece lifting table which is guided for displacement on carriage guideways. Underneath the lifting table, a feeder carriage is disposed vertically displaceably on guideways. These guideways can be separate from the carriage guideways. The lifting table is actuated by means of a single elevating drive which is disposed behind the plane spanned by the carriage guideways.

Abstract: In the present invention, in cutting the top and bottom surfaces of a hot-rolled sheet by the rotation of milling cutters holding the sheet therebetween in the thickness direction of the sheet in the running process of the hot-rolled sheet, the cutting resistance determined by the cutting conditions including the type of hot-rolled sheet, the temperature in cutting, and the cut depth is controlled by the adjustment of cut depth, and cutting is performed by making the tension produced on the hot-rolled sheet by the cutting resistance lower than the breaking strength of the joint portion to prevent the breakage of hot-rolled sheet.

Abstract: A vertical broaching machine comprises a machine stand having an upper rail and a lifting carriage displaceably guided on the stand and drivable by means of lifting spindles which are supported in spindle nuts lodged in the rail for rotational driving. An upper workpiece holder is mounted on the rail, holding a broach when a compressive broaching job is carried out.

Abstract: A shaping machine wherein either a work or a tool is a rod-like member extending along a straight center line while the other is a member having a hole capable of being fitted on the rod-like member and wherein the work is shaped while the member having the hole passes through the rod-like member from one end toward the other end of the rod-like member. The shaping machine comprises a feed mechanism for causing relative movement of the rod-like member and the member having the hole to each other along the center line of the rod-like member, a center line of the feed mechanism being coincident with the center line of the rod-like member.

Abstract: The equal-pitch groove processing device (1) comprises transferring means (10), (40) for continuously transferring a workpiece (100) in an axial direction of the workpiece (100); processing tools (23), (33) in which cutting teeth (23a) of a thickness corresponding to a width of a groove to be processed are formed around an outer peripheral portion along a spiral path, and which is rotatively driven with the center of that spiral as an axis; and controlling means (70), (80) for synchronously operating the processing tools (23), (33) in such a manner that the workpiece (100) is transferred by a one-normal-pitch portion of the spiral while the processing tools (23), (33) undergo one revolution, whereby equal-pitch grooves are formed in the workpiece (100) by the cutting teeth (23a) of the processing tools (23), (33).

Abstract: First and second shaving dies are mounted one above the other and are respectively provided with continuous shaving edges disposed adjacent to contoured annular facial surfaces which draw the shaved material away from the work piece as the shavings are removed by the associated shaving edge. An air nozzle mounted in proximity to the first die directs a jet of air across the contoured facial surface of the first die to blow the removed material away from the first die to prevent its interfering with the operation of the second die. The second die is located directly below the first die and is provided with a plurality of angularly spaced troughs lying immediately adjacent to and below annular facial surfaces on the second die for carrying the shavings from the shaving edges of the second die to a sump located below the second die.

Abstract: A die for use in a punch-press operation has a constant shear angle throughout the entire cutting edge and the surface profile of the die is convex to draw the workpiece away from the cutting edge of the die as the workpiece is being punched out.

Abstract: A broaching machine broaches a multiplicity of generally flat work pieces having a projection at only one side, which are advanced in a single file with the projections extending in the same direction. In order to broach the work pieces in stacked pairs in which the peripheries of the work pieces are continuous, rather than spaced apart by confronting projections, half of the work pieces are inverted and a pair consisting of one inverted work piece and one work piece which has not been inverted are stacked together and presented to a pot broach which broaches the peripheries of both work pieces of the pair in continuous cutting strokes. The finished work pieces are advanced away from the broaching station in stacked condition and are separated into two groups, one of which consists of the bottom work pieces of the pair and the otherconsists of the top work pieces of the pair. This places all work pieces in the same orientation with respect to the lateral projection.