Abstract: In order to allow high-precision machining of the inner surface of a pipe using little machining time, the draw broach has a cutting part having a plurality of cutters extending in the axial draw direction. The cutting part is divided into a main part and an insertion part tapering conically in the draw direction. The insertion part in turn is divided into a front region, viewed in the draw direction, forming a pre-cutting stage, and a rear region, wherein the conicity of the pre-cutting stage is less than that of the rear region.

Abstract: A broaching apparatus includes a first tooth having a front face, a rear face opposite the front face, and a first cutting surface have a lobed shape extending along a first side of the first tooth between the front face and the rear face. A first interface defined between the first cutting surface and the front face is offset relative to a second interface defined between the first cutting surface and the rear face in a direction that is substantially perpendicular to an axis of tooth movement for broaching operations to provide tool clearance rearward from the first interface. A method of making a broach cutter is further provided.

Abstract: A helical broach 1 for roughing includes a cutting tooth part 30 in which n spline teeth 31 are arranged side by side in an axial direction. The spline teeth 31 each include cutting teeth 32 which are arranged at a predetermined helix angle. The cutting teeth 32 each have an acute angle portion and an obtuse angle portion on both sides thereof in a circumferential direction. The cutting teeth disposed on the first to n?1th spline teeth 31 (S1 to Sn?1) in the circumferential direction are each formed in such a way that its height on the acute angle portion side differs from that on the obtuse angle portion side. The cutting teeth (Sn) of the nth spline tooth (Sn) are each formed in such a way that its height stays constant in the circumferential direction.

Abstract: A process to produce alternately concave and convex grooves that are evenly spaced inside a tube, wherein the process includes the steps of at least one simultaneous broaching stage for all the grooves of the tube using at least one roughing tool and/or at least one finishing tool, the tools made integral with a handle bar using a link, the different roughing tools being implemented successively and having a convex profile that gradually approaches the concave profile of the grooves, and at least one finishing tool having a concave profile to make the convex profile of the grooves.

Abstract: An internal broach for internally broaching profiles, defined by a bottom and flanks, of female serrations of a work piece having a toothed section with several rows of broach cutting teeth, the rows being disposed successively counter to a direction of broaching, with successive broach cutting teeth being allocated to each other for broaching a profile. The broach cutting teeth have bottom cutting blades and first and second sides. The first sides are guide flanks, the edges of which are guide edges without cutting ability. The second sides are relieved flanks, the edges of which are relieved edges without cutting ability.

Abstract: The apparatus of the present invention provides a broaching machine configured to produce an internal gear member. The broaching machine includes a broaching tool defining a central axis. The broaching tool includes a first set of broaching teeth configured to cut both a first flank portion and a second flank portion of a plurality of gear teeth. The broaching tool also includes a second set of broaching teeth configured to cut only the second flank portion of the plurality of gear teeth. The plurality of gear teeth are formed such that the first and second flank portions of each gear tooth are tapered between a first end portion and a second end portion. The broaching machine also includes a motor configured to rotate the broaching tool about the central axis at a selectable rate and in a selectable direction. A corresponding method for producing an internal gear member is also provided.

Abstract: An internal broach for internally broaching profiles, defined by a bottom and flanks, of female serrations of a work piece comprises a toothed section with several rows of broach cutting teeth, the rows being disposed successively counter to a direction of broaching, with successive broach cutting teeth being allocated to each other for broaching a profile. The broach cutting teeth have bottom cutting blades and first and second sides. The first sides are guide flanks, the edges of which are guide edges without cutting ability. The second sides are relieved flanks, the edges of which are relieved edges without cutting ability.

Abstract: The broach assembly includes alternate spacers and cutters arranged in a sub-assembly having a lead at a leading end and a lag at a trailing end. The cutters have side margins in excess of the margins of the spacers for cutting material from the dovetail slots of the turbine wheel as the broach assembly passes through the slots. The bottom or apices of each spacer and cutter are tapered to form a continuously tapered surface along the bottom of the broach assembly. Upon passing the broach assembly through the slot, the assembly is progressively displaced in a radial outward direction to progressively cut the active dovetail slot surfaces. Shims may be disposed in the bottom of the slot to further displace the broach assembly radially outwardly in multiple passes.

Abstract: A broach assembly includes an elongated base having a central upward projection and a pair of side flanges and a tapered undersurface. Releasably mounted on the projection are multiple tool holders spaced along the length of the base. The tool holders mount cutters for engaging active surfaces of the wedge slot as the broach assembly is passed through the wedge slot. Shims may be interposed between the tool holders and base to increase the elevation of the cutting surfaces relative to the undersurface of the base to progressively increase the bearing pressure of the cutting surfaces against the active surfaces of the slot during multiple passes of the broach assembly through the wedge slot.

Abstract: A broach assembly includes an elongated base having a central upward projection and a pair of side flanges and a tapered undersurface. Releasably mounted on the projection are multiple tool holders spaced along the length of the base. The tool holders mount cutters for engaging active surfaces of the wedge slot as the broach assembly is passed through the wedge slot. Shims may be interposed between the tool holders and base to increase the elevation of the cutting surfaces relative to the undersurface of the base to progressively increase the bearing pressure of the cutting surfaces against the active surfaces of the slot during multiple passes of the broach assembly through the wedge slot.

Abstract: The broach assembly includes alternate spacers and cutters arranged in a sub-assembly having a lead at a leading end and a lag at a trailing end. The cutters have side margins in excess of the margins of the spacers for cutting material from the dovetail slots of the turbine wheel as the broach assembly passes through the slots. The bottom or apices of each spacer is tapered and extends beyond the corresponding surface of the cutter to progressively displace the assembly in a radial outward direction to progressively cut the active dovetail slot surfaces. Shims may be disposed in the bottom of the slot to further displace the broach assembly radially outwardly in multiple passes.

Abstract: A broach comprises an elongate body having a plurality of longitudinally spaced pockets therein. A threaded hole is provided in each of the pockets. The pockets are adapted to receive cutting inserts. The cutting inserts have a hole that is adapted to align with a hole in the pockets. The aligning holes are adapted to receive insert screws. The insert screws are threadably received in the threaded hole in the pockets. When a cutting insert becomes worn or damaged, it may be removed from its pocket and replaced with another cutting insert. Hence, the broach need not be discarded because of a worn or damaged cutting insert.

Abstract: The broach assembly includes alternate spacers and cutters arranged in a sub-assembly having a lead at a leading end and a lag at a trailing end. The cutters have side margins in excess of the margins of the spacers for cutting material from the dovetail slots of the turbine wheel as the broach assembly passes through the slots. The bottom or apices of each spacer is tapered and extends beyond the corresponding surface of the cutter to progressively displace the assembly in a radial outward direction to progressively cut the active dovetail slot surfaces. Shims may be disposed in the bottom of the slot to further displace the broach assembly radially outwardly in multiple passes.

Abstract: A helical gear tooth broach having an elongate body having a series of axially aligned and spaced teeth disposed thereon. The direction of tooth spaces or traces of the teeth in a longitudinally extending helical alignment and the direction of the gullets of the teeth in a side by side circumferentially extending helical arrangement are both oriented at a right-upward or a left-upward helix angle in common with each other.

Abstract: The invention concerns a spindle (1) for machining inner grooves and comprising a cylindrical input guide (15) of diameter D1 and a cutting portion (20). Said spindle is characterised in that the cutting portion (20) is subdivided into a plurality of cutting sections (25) separated by realigning guides (26) having a diameter equal to diameter D1 of the input guide (15), so as to accurately centre the grooves relative to the hole previously machined in the workpiece (30).

Abstract: A helical gear tooth broach is provided which does not require to clamp strongly the work to be broached by a special clamping device, and which does not perform an intermittent cutting action against the work. A gear tooth broach is provided having an elongate body having a series of axially aligned and spaced teeth disposed thereon. The direction of tooth spaces or traces of the teeth in a longitudinally extending helical alignment and the direction of the gullets of the teeth in a general side by side circumferentially extending helical arrangement are both oriented to the same hand of helix angle.

Abstract: An internal broach for the broaching of profiles defined by a bottom and flanks, in particular of internal toothings, in a workpiece is provided with broach cutting teeth which have bottom-cutting edges and flank-cutting edges. Over their full profile height, the flank-cutting edges of broach cutting teeth disposed one after the other and allocated to each other have an ascending profile in the range of 1 .mu.m to 3 .mu.m.

Abstract: An apparatus for treating the inner surface of a vacuum chamber includes a support, means for anchoring the vacuum chamber to the support and holding the vacuum chamber, a broach having a plurality of cutting edges having cutouts, and broach drive means to which the broach arranged on the support is fitted. The broach drive means unidirectionally moves the broach relatively to the vacuum chamber in an axial direction to cut off a contaminated layer on an inner surface of the vacuum chamber. The outer diameter of each cutting edge, excluding the cutouts, is set greater than that of an immediately preceding one in a direction of a rearmost edge face from a front edge face. The apparatus may also include means for supplying an inert gas or a mixture of nitrogen and inert gases to a surface of the vacuum chamber being treated by the broach, or means for supplying a lower alcohol for dissolving contaminants contained in the contaminated layer to the surface of the vacuum chamber being treated by the broach.

Abstract: A metal removing tool, in particular lancing insert, has a holder (10) with a slot-shaped recess (11) and a cutting insert (12) detachably held therein under a prestress by means of an elastically expandable clamping arm (101) designed as one side of the recess (11). The opposite cooperating insertion and bearing surfaces of the cutting insert (12) and slot-shaped recess (11) have a V-shaped cross-section. At its insertion and bearing surface facing the clamping arm (101), the cutting insert has a plurality of substantially flat partial surfaces (124, 125, 126) arranged behind each other in the insertion direction. Two surfaces enclose an obtuse angle .alpha. and form a salient point at the ridge (127), so that the clamping arm (101) engages the cutting insert (12) between the ridge (127) and the cutting edge (121) in the clamping state.

Abstract: A broaching tool has a plurality of cutting teeth for broaching a small, deep hole with high precision and surface finish. Three to eight teeth are engaged in the hole for cutting at any one time. For broaching sticky metals such as stainless steel, each cutting tooth has a face angle, backoff angle and rise which are sufficiently large to prevent thermal hardening of the hole surface. A ring is provided between the front face and land of each cutting tooth having a width selected to prevent formation of axial and ring-shaped tool traces. V-shaped notches having a large radial angle and a small backoff angle are formed in the land of each cutting tooth to break chips and prevent clogging. The tool further includes a rear pilot having a plurality of smoothing teeth with a diameter larger than the finished diameter of the hole. A set of rough and fine broaching tools can be provided, with the fine tool being processed to convert it to a rough tool when it is worn beyond tolerance.

Abstract: A broaching method for finishing an outer peripheral surface of a resin layer of a resin-coated lobe-type rotor for a rotary fluid machine of a Roots type, which includes the steps of forming, with a leading grooving cutter, at least one chip-breaker groove in the outer peripheral surface of the resin layer, such that the chip-breaker groove extends in a broaching direction parallel to an axis of rotation of the rotor. The method further includes the steps of finishing at least a portion of the outer peripheral surface of the resin layer with a trailing finish cutter having a cutting edge contour corresponding to the portion of the outer peripheral surface of the resin layer, which is finished by the finish cutter after the chip-breaker groove is formed therein by the grooving cutter. A composite broach or formed broach having the grooving and finish cutters is fed such that the grooving cutter leads the finish cutter in the broaching direction.

Abstract: A broaching tool is provided with at least nine cutting tool edges arranged at its circumference. The cutting tool edges cover only a certain sector along the circumference of a tool disk while leaving another sector between a first and last cutting tool edge free of cutting tool edges. This feature enables moving a tool axially relative to a work piece without first moving the tool radially relative to the work piece. Further, the tool can be moved radially without damage. These movements are performed when the sector without cutting tool edges faces the work piece. This sector without cutting tool edges has an opening angle of less than 180.degree. and it provides a spacing and free space relative to a work piece. Thus, work piece surfaces that have been machined by the cutting edges, are free of these cutting edges if and when the other sector faces the work piece.

Abstract: An improved cutting tooth configuration in which, unlike the conventional, straight line tool pattern with its constant tool rise, each tooth is incrementally advanced relative to the prior tooth by an amount that progressively decreases. This accounts for the variations in reaction force on the cutting teeth caused by workpiece deflections, so that the net thickness of material removed by each cutting tooth remains relatively constant. Instability and variation in the cutting force is thereby avoided, and tool wear is decreased.

Abstract: An improved cutting tooth configuration in which, unlike the conventional, straight line tool pattern with its constant tool rise, each tooth is incrementally advanced relative to the prior tooth by an amount that progressively decreases. This accounts for the variations in reaction force on the cutting teeth caused by workpiece deflections, so that the net thickness of material removed by each cutting tooth remains relatively constant. Instability and variation in the cutting force are thereby avoided, and tool wear is decreased.

Abstract: A broaching method for finishing an outer peripheral surface of a resin layer of a resin-coated lobe-type rotor for a rotary fluid machine of a Roots type, which includes the steps of forming, with a leading grooving cutter, at least one chip-breaker groove in the outer peripheral surface of the resin layer, such that the chip-breaker groove extends in a broaching direction parallel to an axis of rotation of the rotor. The method further includes the steps of finishing at least a portion of the outer peripheral surface of the resin layer with a trailing finish cutter having a cutting edge contour corresponding to the portion of the outer peripheral surface of the resin layer, which is finished by the finish cutter after the chip-breaker groove is formed therein by the grooving cutter. A composite broach or formed broach having the grooving and finish cutters is fed such that the grooving cutter leads the finish cutter in the broaching direction.

Abstract: A tooth broach designed for use with thin workpieces having its teeth arranged in circumferentially extending sets in each of which the teeth are arranged in groups of one or more teeth, and gaps devoid of teeth between adjacent groups. The teeth are further arranged in longitudinally extending series, in which consecutive teeth in each series are separated by gaps in the adjacent sets. This provides for reduced axial spacing between axially adjacent sets of teeth to maintain cutting action at all times with a thin workpiece.