90results about "Boring heads" patented technology

The invention belongs to the field of machine manufacturing, and discloses a deep hole inner molded surface profiling boring direct-drive intelligent control cutter system which comprises a cutter assembly, a rotary drive assembly and a sensor assembly. A rotary driving shaft of the rotary driving assembly is connected with an axial gear of the right-angle bevel gear pair, the inner side of a radial gear is connected with a driving nut, and the base plate and the tool apron are connected through a ball screw, so that a blade on the tool apron is driven to achieve radial feeding. The sensor assembly comprises a force sensor, a temperature sensor and a vibration sensor, signals are collected in real time and fed back to the drive control circuit board to control the rotary drive assembly, and therefore the profiling boring precision of blade feeding is improved. Direct driving and intelligent sensing control are combined and embedded in the profiling adjusting type boring cutter, a cutter transmission chain is greatly reduced, the transmission rigidity, the control precision and the response speed are improved, and therefore the performance requirements of a deep hole complex inner profile for high precision, high quality, high efficiency and high cost performance are met.

A boring head arranged for holding a boring tool for metal cutting includes a main body having a support surface and a scale surface. The boring head further includes a piston including a boring tool interface for fixedly carrying the boring tool. The piston is movably arranged in the main body along the positioning axis (y), and a micrometer screw. The micrometer screw is arranged in the main body and coupled to the piston, such that, when the micrometer screw is rotated, the piston is moved along the positioning axis to one of the protracted positions or the retracted position. The micrometer screw has a head abutting against the support surface. The head includes a radially outer head surface provided with first graduation marks. The scale surface is provided with second graduation marks aligned with the first graduation marks to provide a reading of the axial position of the piston.

The application relates to the boring technical field and particularly relates to a semi-axle machining boring equipment; the equipment comprises a machine tool and a three-jaw chuck with a feeding hole on the machine tool; the three-jaw chuck is driven to rotate by the machine tool; the working surface of the machine tool is horizontally provided with a track; the track is slidably connected with a feeding seat on the left and right sides; the upper surface of the feeding seat is fixedly connected with a clamping seat through a lifting table; the clamping seat is connected with a cutter bar on the left side; the arc-shaped outer wall of the cutter bar is provided with a rod groove at the lower position; the left and right inner walls of the rod groove are connected with a screw rod; the rod groove is movably connected with a plurality of cutter blades; the standard workpiece is used to pre-adjust the cutter blades and lock the adjacent height difference; only the workpiece rotation and the cutter blade radial feeding are needed during boring, the cutter blades do not need to be frequently adjusted, the clamping is convenient, the boring is stable, the multi-step hole machining requirement is met, the efficiency is higher, the high-precision hole diameter difference scene is adapted, the multi-cutter blade synchronous cutting shortens the feeding cycle, and the batch production is adapted.

To provide a cutting insert, a body, and a cutting tool capable of suppressing a thickness while being usable by switching four cutting edges.SOLUTION: A cutting insert 30 attached to a body 20 of a cutting tool 10 includes: a first surface 110 having a substantially parallelogram shape, including one end surface among a pair of end surfaces facing each other, and functioning as a surface including first rake surfaces 151, 152; a pair of first cutting edges 511, 512 formed along a pair of sides 111, 113 facing each other among sides defining the first surface 110; second surfaces 210, 220 having a substantially trapezoidal shape, including a pair of side surfaces facing each other, and functioning as a surface including second rake surfaces 621, 622; and second cutting edges 521, 522 formed along one side 201, 203 among sides defining the second surfaces 210, 220.SELECTED DRAWING: Figure 1

Tool (5) for machining a workpiece (4), comprising: - a tool shank (12) rotatable about a rotary axis (10), - a cutting device (13) arranged on the tool shank (12) with: - at least one pre-cutting element (14) and - at least one post-cutting element (15),- a first slide unit (8) for displacing the at least one pre-cutting element (14) relative to the tool shank (12) with -- a first output body (25) connected to the at least one pre-cutting element (14) and -- a first drive body (23) interacting with the respective first output body (25) via a first drive surface (24) and - a second slide unit (9) displaceable relative to the first slide unit (8) for displacing the at least one re-cutting element (15) relative to the tool shank (12) with -- a second output body (29) connected to the at least one re-cutting element (15) and -- a second drive body (27) interacting with the respective second output body (29) via a second drive surface (28), wherein the first drive surface (24) and the second drive surface (28) overlap each other in an orthogonal projection onto a transverse plane to the axis of rotation (10), thereby characterizedthat a maximum feed path (s1, s2) of at least two of the output bodies (25, 29) is different.

The present invention relates to a boring head for metal cutting, which has a main axis in a diameter direction (y), and an extension in a height direction (z), which height direction (z) is perpendicular to the main axis, and comprises a support unit (3), a tool unit (4), and a locking mechanism. The support unit (3) extends axially inward along the main axis from an axially outer end, and comprises a support interface (8) at the outer end. The tool unit (4) extends axially outward along the main axis from an axially inner end, and comprises a tool interface (12) at the inner end. The tool unit (4) is releasably secured to the support unit (3) by the locking mechanisms forcing the tool interface (12) against the support interface (8). The support interface (8) comprises a pair of support guide surfaces (16), which extend in the height direction (z) and face in opposite directions. The tool interface (12) comprises a pair of tool guide surfaces (22), which extend in the height direction (z) and face in opposite directions toward a respective one of the support guide surfaces (16), wherein the tool unit (4) is movably arranged in the height direction (z) by the tool guide surfaces (22) sliding against a respective one of the support guide surfaces (16).

The invention discloses a forward precise fine-tuning boring cutter, which relates to the technical field of machine tool cutters and comprises a mounting frame, a cutter handle mounted on the mounting frame, a blind rivet fixed on the cutter handle, a conical circular truncated cone fixed at one end of the cutter handle far away from the blind rivet, a cutter bridge mounted on the circular truncated cone, and two cutter holders mounted on the cutter bridge. A forward boring tool bit and a reverse boring tool bit are installed on the two tool aprons respectively and symmetrically distributed in the axial direction of the tool handle in a back-to-back mode, the axial distance between the forward boring tool bit and the reverse boring tool bit is larger than the axial size of a boss, needing to avoid space, of a machined workpiece, heightening blocks are installed between the forward boring tool bit and the tool aprons, and the forward boring tool bit is higher than the reverse boring tool bit. The fine adjustment mechanism and the locking mechanism are arranged on the tool apron, a worker does not need to stop the machine to change the rotating direction of the main shaft, boring machining of holes in the forward direction and the reverse direction is achieved, the machine stop machining auxiliary time is shortened, the stability of concentricity of all the holes is improved, and the machining efficiency of workpieces is improved.

The invention provides gear boring equipment for gear box production and machining, and relates to the technical field of gear box boring, the gear boring equipment comprises a boring head structure applied to the equipment, the boring head structure comprises a boring arm and a driving shaft, an adapter is arranged at the end, close to the driving shaft, of the boring arm, and a limiting trapezoidal block is integrally formed on the surface of the adapter; a supporting base is integrally formed at the end, close to the boring arm, of the driving shaft, a boring tool bit is arranged in the end, away from the driving shaft, of the boring arm, and a bipolar control structure is arranged between the driving shaft and the boring arm. The technical key points are as follows: after the boring tool bit is controlled to extend out of the inside of the boring arm to a limit position by utilizing a bipolar control structure, the switching seat is continuously controlled to move towards the moving direction of the boring tool bit relative to the supporting seat, so that the boring arm and the driving shaft are changed from a coaxial state to a non-coaxial state; the boring length of the boring tool bit in the gearbox is increased, the boring space is enlarged, and the application range is wide.

The application discloses a taper hole boring tool with adjustable taper and a stepped hole processing method, and belongs to the technical field of machining. The taper hole boring tool and the stepped hole processing method adjust the taper hole boring taper adjusting knob, drive the lead screw to rotate, and make the radial sliding block move along the horizontal direction of the slide support. The radial sliding block drives the upper end of the boring bar angle rail to move, the boring bar angle rail drives the axial sliding block to move along the vertical direction of the slide support, and the boring bar angle rail is kept consistent with the angle of the taper hole. The angle of the boring bar angle rail is adjusted according to the taper hole angle requirement on the drawing, the relative position of the boring bar angle rail and the boring bar support is changed through the transmission rod, the horizontal direction displacement of the boring bar support is transmitted to the large-diameter boring bar or the small-diameter boring bar, and thus the boring machining of taper holes with different angles is realized, the universality of the device is improved, and the customization cost of the forming tool is reduced.

The present invention relates to a boring head for metal cutting, which has a main axis in a diameter direction (y), and an extension in a height direction (z), which height direction (z) is perpendicular to the main axis, and comprises a support unit (3), a tool unit (4), and a locking mechanism. The support unit (3) extends axially inward along the main axis from an axially outer end, and comprises a support interface (8) at the outer end. The tool unit (4) extends axially outward along the main axis from an axially inner end, and comprises a tool interface (12) at the inner end. The tool unit (4) is releasably secured to the support unit (3) by the locking mechanisms forcing the tool interface (12) against the support interface (8). The support interface (8) comprises a pair of support guide surfaces (16), which extend in the height direction (z) and face in opposite directions. The tool interface (12) comprises a pair of tool guide surfaces (22), which extend in the height direction (z) and face in opposite directions toward a respective one of the support guide surfaces (16), wherein the tool unit (4) is movably arranged in the height direction (z) by the tool guide surfaces (22) sliding against a respective one of the support guide surfaces (16).

This cutting tool has a body portion and a cutting edge layer. The body portion is rod-shaped. The cutting edge layer is provided at the front end of the body portion. The cutting edge layer forms a cutting edge. The body portion is formed of cemented carbide containing tungsten carbide and cobalt. The cutting edge layer is formed of polycrystalline diamond. In the cemented carbide, the percentage of a value obtained by dividing the weight of the tungsten carbide by the weight of the entire cemented carbide is 90.0-95.0%. In the cemented carbide, the percentage of a value obtained by dividing the weight of the cobalt by the weight of the entire cemented carbide is 4.0-9.0%.

The invention relates to a multifunction spindle for a machine tool for machining workpieces, comprising a spindle housing, a rotational drive and a tool-holding unit, wherein the tool-holding unit is disposed within the spindle housing and can pivot relative to the spindle housing about an axis perpendicular to the axis of rotation. The problem addressed by the invention is that of providing a corresponding multifunction spindle which, in particular during the turning of polygonal profiles, allows fast and largely complete compensation of imbalances which occur and an increase in the accuracy of the positioning of the axis lying perpendicular to the drive shaft, while at the same time functional reliability is established. The problem is solved in that at least two mutually independent and directly adjacent measurement systems for sensing identical position angles are connected to the tool-holding unit, by means of which measurement systems the measured position angle signals can be transmitted, using a transmission unit, on at least two mutually independent transmission paths to a controller of the machine tool equipped with the multifunction spindle, at least one transmission path being used for position control and at least one transmission path being used to establish the functional reliability of the pivot axis lying perpendicular to the drive shaft, the transmission unit contactlessly supplying power to at least two connected measurement systems, the transmission unit consisting of at least two parts which rotate relative to each other at the spindle rotational speed, and the transmission unit having a central bore through which media channels are centrally led.

The utility model relates to the field of machine tools, and mainly discloses a novel boring cutter structure which comprises a mounting seat, a strip-shaped seat, an adjusting seat, a connecting seat, a clamping head and a boring cutter body, the boring cutter body is composed of a cutter bar and a cutter head, the cutter head and the cutter bar are integrally formed, a cutter point is arranged at the end, away from the cutter bar, of the cutter head, and the cutter point is in an R shape. The mounting seat and the strip-shaped seat are assembled, the position of the boring cutter body can be changed through the strip-shaped seat after the boring cutter body is fixedly mounted, the boring cutter body can be roughly adjusted, and then the boring cutter body can be finely adjusted through the adjusting seat, so that the adjusting accuracy of the boring cutter body is ensured; the clamping head can be rapidly adjusted, boring cutter bodies of different specifications can be rapidly clamped, the outer portion of the cutter head arranged at the end of the boring cutter body can be coated with different coatings according to different materials needing to be bored, and boring operation can be better conducted through the formed R-line cutter point.

The invention relates to a reamer and to a reamer and floating head assembly. The task of the invention is to provide a reamer that will provide for high machining accuracy, will be adjustable for machining workpieces having different diameters and will allow for quick restoration or replacement of blades and guides. A reamer (1; 101) comprises a head (2; 102), at least three guides (3; 103), each consisting of a guide part (3 a; 103 a), movably arranged in the head, and a pointed part (3b; 103b), the guides being arranged at an angle φ with respect to the central axis of the head, and wherein part of the surface of the pointed part of the respective guide, which is intended to come in contact with the workpiece, is arranged at the same angle φ with respect to the central axis of the respective guide so that part of the surface of the pointed part of the respective guide, which is intended to come in contact with the workpiece, is arranged parallel to the central axis of the head, a blade holder (4; 104), an adjusting screw (5; 105) of the guides, elements (3c, 5a, 5b, 11, 12; 103c, 111) for transferring the translational movement of the adjusting screw (5; 105) of the guides to the guides and the blade holder, and a blade (6; 106) for machining the workpiece.

The invention provides a main body with a guide part, a guide pad and a hole processing tool, and the guide part can restrain welding caused by heat generated by friction during processing and prolong service life. A machine body (100) of a hole processing tool (10) is provided with: a cylindrical main body (110); and a guide part (300) provided on the outer periphery of the main body (110). The guide section (300) has: a holding groove (320) formed in the main body (110); and a rotating body (330) which is accommodated in the holding groove (320) in a rotatable manner.

The invention relates to a tool (1) for machining a workpiece, comprising: a tool body (3) having a central axis (5); at least one blade element holder (7) which is arranged on the active end (9) of the tool body (3) in a displaceable manner in a displacement direction relative to the central axis (5) in order to change the machining diameter of the tool (1) when the at least one blade element holder (7) is displaced in the displacement direction, the blade element holder (7) comprising at least one blade element (11) for machining a workpiece; and a displacement device (13), which is arranged in the knife body (3) and comprises a drive element (15), which can be displaced along the central axis (5), and at least one displacement member (17), which is operatively connected to an associated blade element holder (7) of the at least one blade element holder (7), the at least one displacement component (17) protrudes from the drive element (15) in a protruding direction parallel to the displacement direction and comprises a first movement transmission element (19) which is spaced apart from the drive element (15) in the displacement direction, the first movement transmission element (19) is configured to convert a displacement of the drive element (15) along the central axis (5) into a displacement of the blade element holder (7) associated with the displacement member (17) in a displacement direction.

A cutting tool having a main body (4) extending along a longitudinal central axis (9) and a cutting insert (1), which is held on the main body (4) in an axially and / or radially positionally-adjustable manner and can be tensioned by means of a clamping claw (3). The cutting insert (1) is held by a clamping holder (2), which is held in a positionally-adjustable manner on the main body (4), and which can be tensioned on the main body (4) by means of the clamping claw (3) pressing against the cutting insert (1).

The utility model provides a forward reaming and reverse boring cutter for machining a steering engine shell, and belongs to the technical field of machining. Comprising a cutter handle and a cutter bar, a cutter locking block is fixedly connected to one end of the cutter handle, a cutter head is detachably connected to the end, away from the cutter handle, of the cutter locking block, four cutter holders are connected to the cutter head in a circumferential mode, a through groove is formed in the cutter head, and fixing blocks are fixedly connected to the sides, close to the cutter head, of the cutter holders; the fixing block penetrates through the cutter head and extends into the through groove, and one side of the fixing block is inclined and provided with a sliding groove. According to the boring cutter, the cutter holder is arranged, so that the first cutter head can expand outwards during boring, the diameter of a to-be-machined hole is freely adjusted, the second cutter head is arranged, the second cutter head conducts finish machining on the hole, when the cutter holder moves, the second cutter head can adjust the back taper angle of the hole by means of the inclined plane, and machining of different requirements is facilitated.

The invention discloses a fine boring cutter for an inner cavity of a motor shell. The fine boring cutter comprises a cutter body and a mounting cavity, the connecting column is arranged on one side of the cutter body, the cutter handle is arranged on one side of the connecting column, and the cutter body, the connecting column and the cutter handle are matched, so that assembly of the cutter body and the cutter handle is completely presented; the two sets of mounting cavities are formed in the cutter body, and the two sets of boring cutter clamps and the blades are correspondingly assembled, so that the function of machining two sections of holes with different inner diameters at a time is achieved, multiple times of clamping and cutter replacement are not needed, and the machining efficiency is improved; the cutter handle, the cutter body and the boring cutter clamp are all reusable components, so that only the blade needs to be replaced when the blade is abraded, the whole cutter does not need to be replaced, and the overall replacement cost of the cutter is greatly reduced; the outer diameter can be adjusted by finely adjusting the boring cutter clamp, so that the cutter can meet the machining requirements of inner cavities of motor shells with different hole diameters, new cutters do not need to be specially designed and manufactured for different hole diameters, the types and the number of the cutters are reduced, and the purchasing and inventory cost of the cutters is reduced.

Turning cutting tool (10), comprising: a tool body (11) comprising a flute section (18) having a plurality of helical flutes (22) separated from each other by teeth (23); and an adjustable vibration absorber arrangement (60) arranged within a cavity (25) formed in the clamping groove section (18), the adjustable vibration absorber arrangement (60) comprising at least two adjustable absorber masses (62), an elastic material (64) between the at least two absorber masses (62) and the cavity (25), and one or more connecting elements (66) arranged between the at least two absorber masses (62) to prevent a relative angular displacement between the at least two adjustable absorber masses (62) about a central longitudinal axis (12) of the rotary cutting tool (10), wherein the one or more connecting elements (66) are not in contact with the tool body (11) to allow the at least two adjustable absorber masses (62) to be held only by the elastic material (64), which enablesthat the adjustable vibration absorber arrangement (60) is set to a desired frequency in order to suppress torsional vibrations of the rotary cutting tool (10) during a cutting operation.

The invention relates to the technical field of boring, in particular to boring equipment for half shaft machining. Comprising a machine tool and a three-jaw chuck with a feeding hole on the machine tool; the three-jaw chuck is driven by a machine tool to rotate; a track is horizontally arranged on the working surface of the machine tool; the track is connected with a feeding seat in a left-right sliding manner; the upper surface of the feeding base is fixedly connected with a clamping base through a lifting table. The clamping seat is leftwards connected with a cutter bar; a rod groove is formed in the lower position of the arc-shaped outer wall of the cutter rod; the left and right inner walls of the rod groove are connected with screw rods; the rod groove is movably connected with a plurality of blades; the blade is preset through the standard workpiece, the adjacent height difference is locked, during boring, only workpiece rotation and blade radial feeding are needed, frequent blade adjustment is not needed, clamping convenience and boring stability are kept, meanwhile, the multi-step hole machining requirement is met, efficiency is higher, and a high-precision hole diameter difference value scene is adapted; and the feeding period is shortened through multi-blade synchronous cutting, and batch production is adapted.

The cutting tool has a main body and a cutting edge layer. The main body is rod-shaped. The cutting edge layer is provided at a front end of the main body. The cutting edge layer forms a cutting edge. The main body is formed of a cemented carbide containing tungsten carbide and cobalt. The cutting edge layer is formed of polycrystalline diamond. In the cemented carbide, the weight of the tungsten carbide divided by the weight of the entire cemented carbide is a percentage of 90.0% or more and 95.0% or less. In the cemented carbide, the weight of the cobalt divided by the weight of the entire cemented carbide is a percentage of 4.0% or more and 9.0% or less.

The utility model relates to the technical field of machining numerical control tools, in particular to a radial adjusting structure of a heavy boring head, which comprises a main body and blade seats, two seat bodies are arranged at the top of the main body, each seat body is provided with a blade seat, each blade seat is provided with a threaded hole, each blade seat is provided with a fixing hole, and a connecting block is fixed at the bottom of each blade seat. Two adjusting grooves are formed in the main body, two adjusting holes are formed in the side wall of the main body, and the adjusting holes are communicated with the adjacent adjusting grooves; when the blade seat is fixed on the seat body, the connecting block extends into the adjusting groove, an adjusting bolt is further arranged in the adjusting groove, the adjusting bolt is connected with the connecting block through threads in a matched mode, the head of the adjusting bolt is aligned with the adjusting hole, and a fastening bolt penetrates through the fixing hole and is locked into the threaded hole. The utility model has the advantages that the structure is simple, the adjustment is convenient, the condition that the cutter body is separated from the cutter body due to inevitable tiny vibration in the machining process is avoided, and the machining size is very stable.

An anti-vibration structure for a rotating body (2) is provided with: a cylindrical rotating body (2) having a rotation axis (X), an opening (7a) provided at one end in the direction along the rotation axis (X), and a hollow section (7) provided continuously along the rotation axis (X) from the opening (7a); a weight member (12) disposed in the hollow portion (7); a plurality of elastic members (24, 25) that hold the weight member (12); and a head member (4) that closes the opening (7a) and is connected to the rotating body (2) so as to be coaxial with the rotating shaft center (X), the cross-section of the opening (7a) and the hollow section (7) being a circle centered on the rotating shaft center (X), the weight member (12) being cylindrical and disposed so as to be coaxial with the rotating shaft center (X), the head member (4) being capable of attaching the cutting tool (5) to the side opposite the side connected to the rotating body (2), and the head member (4) being capable of attaching the cutting tool (5) to the rotating body (2). The weight member (12) has a protruding portion (13) that protrudes further toward the head member (4) than a boundary (B) of outer peripheries (21a, 41a) between the rotating body (2) and the head member (4).

A boring head (1) comprises: a tool body (10) that has an axial core (X) and that can be mounted such that the axial core (X) is coaxial with the rotation axis of a main spindle of a machine tool; a synchronization member (40) that is accommodated in the tool body (10) so as to be rotatable; and a plurality of cartridges (20) that are attached to an end surface (14a) of the tool body (10) on the side where the synchronization member (40) is accommodated, so as to be movable in a direction perpendicular to the axial core (X), and that can hold a cutting blade (30). The plurality of cartridges (20) have, on the bottom surface thereof positioned on the side facing the tool body (10), a plurality of engagement grooves (26) formed in a direction perpendicular to the movement direction of the cartridges (20). The synchronization member (40) has a plurality of columnar engagement pins (46) engaged with the plurality of engagement grooves (26), and each of the plurality of engagement pins (46) is disposed at a position rotationally symmetric with respect to the axial core (X).

The utility model discloses a large-aperture adjustable flat-bottom counter bore machining U drill, relates to the technical field of mechanical drilling, and solves the problems of low machining speed and high machining cost when a traditional radial drilling machine is used for boring and machining a large-aperture counter bore. Comprising a drill bit body and a cutter handle, a centering bearing is arranged at the end of the drill bit body, and a pressing plate is arranged at the head of the centering bearing to fix the centering bearing at the end; blade seats are symmetrically arranged on the drill bit body, a plurality of blade grooves are formed in the ends, close to the centering bearing, of the blade seats, a blade is arranged in each blade groove, and each edge of each blade can be used in a direction-rotatable mode. The blade seats are divided into two types, one type is a triangular blade seat, and the blades arranged in the blade grooves of the blade seats are triangular; the other blade seat is a square blade seat, and the blade arranged in the blade groove is square; the centering bearing is detachably connected with the drill bit body, the blade seat is detachably connected with the drill bit body and replaced, the blade and the blade seat are detachable, and the blade seat can adjust the counter bore machining diameter size of the U drill.

The utility model provides a deflection boring cutter which comprises a fixing portion, a connecting portion and a working portion, the fixing portion is used for being fixed with a machine tool spindle, the connecting portion extends from the fixing portion to the side away from a machine tool, the connecting portion is cylindrical, a flow channel is arranged in the connecting portion, and the working portion is arranged at the end of the connecting portion. The working part comprises a mounting block eccentrically arranged relative to the connecting part, a first tool bit unit and a second tool bit unit, the first tool bit unit and the second tool bit unit are arranged on the front side and the rear side of the bottom of the mounting block, a liquid storage cavity communicating with the flow channel is formed in the mounting block, and a first liquid outlet channel communicating with the liquid storage cavity is formed in the first tool bit unit; and a second liquid outlet channel communicated with the liquid storage cavity is formed in the second tool bit unit. The first tool bit unit and the second tool bit unit are detachably arranged on the front side and the rear side of the working part respectively, so that the problem that symmetrical spigot holes on the inner side are difficult to bore is solved, and the machining efficiency is improved while the dimensional accuracy is guaranteed. Adjustment and replacement can be carried out according to different hole diameter sizes, and the utilization rate and universality of the eccentric boring cutter are greatly improved.

To provide a boring head that is able to easily equalize radial distances of a plurality of cutting edges with respect to a rotation axis when performing boring.SOLUTION: A boring head 1 includes: a drill body 10 having an axis X and attachable so that the axis X is coaxial with a rotation axis of a spindle of a machine tool; a synchronizing member 40 rotatably accommodated in the drill body 10; and a plurality of cartridges 20 that are attached to an end surface 14a of the drill body 10, on a side where the synchronizing member 40 is accommodated, so as to be movable in a direction perpendicular to the axis X and that are capable of holding a cutting edge 30. The plurality of cartridges 20 have, on a bottom surface located on a side facing the tool body 10, a plurality of engagement grooves 26 formed in a direction perpendicular to a moving direction of the cartridges 20. The synchronization member 40 has a plurality of cylindrical engagement pins 46 engaged with the plurality of engagement grooves 26, and each of the plurality of engagement pins 46 is disposed at a position rotationally symmetric with respect to the axis X.SELECTED DRAWING: Figure 7

The invention provides a direct-drive type rotary reducing boring cutter for machining the inner contour of a deep hole. The direct-drive type rotary reducing boring cutter comprises a cutter assembly, a rotary driving assembly and a feeding driving assembly which are coaxially connected in sequence. The cutter assembly comprises a cutter bar sleeve connected with the rotary driving assembly, a cutter holder is mounted in the cutter bar sleeve, a blade and a cutter holder chute are mounted on the cutter holder, and a feeding wedge block is arranged in the cutter holder chute; a fixed core sleeve is installed in the cutter bar sleeve, a feeding core shaft is installed in the fixed core sleeve, a semi-cylindrical table is arranged on the feeding core shaft, feeding wedge-shaped blocks are arranged on the end face of the semi-cylindrical table along the opposite angles of the semi-cylindrical table, and the rear end of the feeding core shaft penetrates through a rotary driving assembly and then is connected with the feeding driving assembly. According to the boring cutter, the cutter assembly, the rotating assembly and the feeding assembly are integrally and coaxially arranged through the advanced direct drive technology, a cutter transmission chain is reduced, and the machining stability and efficiency are improved; therefore, the boring precision and quality of the inner contour of the deep hole are improved, and the machining requirements of the inner contours of various complex deep holes are met.