737results about "Tool holders" patented technology

The invention discloses a horizontal five-axis turning and milling composite center with a self-adaptive matching system. The horizontal five-axis turning and milling composite center comprises a tool turret, a boring tool mechanism, a tool changing area and a control system. A radio frequency identification reading device is arranged in a tool changing area of the tool turret and the boring tool mechanism, and an RFID chip tag is attached to the outer surface of each tool and used for storing tool serial numbers, specifications and length compensation parameters. And the control system realizes self-adaptive matching and sequential error correction of the cutter and the working procedure through radio frequency identification. The tool changing area is provided with a visual monitoring assembly which comprises a plurality of sets of industrial cameras, an adjustable light source and a structured light stripe illumination module and is used for detecting the clamping posture, the abrasion state and the type of a tool. The system has self-learning and digital twinning simulation functions, and can simulate the motion trail of the cutter and predict the interference risk before the cutter is changed. According to the method, integrated control over automatic tool recognition, posture correction, abrasion detection and path prediction is achieved, and the tool changing precision, the operation stability and the automation level of the horizontal five-axis turning and milling composite center are remarkably improved.

The invention discloses a numerical control machine tool device convenient for changing the cutting angle of a cutter, and relates to the technical field of numerical control machine tools, the numerical control machine tool device comprises a main body structure, the main body structure comprises a machine tool body, one side of the top of the machine tool body is fixedly connected with a three-jaw chuck, one side of the three-jaw chuck is provided with a cutter rest, and the bottom of the cutter rest is fixedly connected with a cutter table; the centering assembly comprises a fixing bolt connected to the top of the tool rest in a threaded mode, and the surface of the fixing bolt is rotationally connected with a connecting plate. The centering assembly is used for replacing manual visual alignment, tool positioning is achieved, the tool positioning state can be switched under the conditions that a tool rest is not aligned, and the tool is obliquely installed due to abrasion, the tool can be obliquely installed according to actual requirements, and therefore the cutting angle can be conveniently adjusted and changed; and a cutter pushing-in-dust removal linkage mechanism is achieved through the dust removal assembly, so that it is guaranteed that the fixing bolt can be tightly attached to the top of the cutter when being fastened, the cutter can be ejected out in an auxiliary mode when the cutter is disassembled, and use convenience is improved.

The tool turret comprises a tool turret body, a tool disc, a motor and a tool apron, a first gear is arranged on the tool disc, a second gear is arranged on an output shaft of the motor, the first gear is meshed with the second gear, a first mounting groove is formed in the tool disc, the tool apron is inserted into the first mounting groove, and the tool turret is arranged in the first mounting groove. A limiting block is arranged on the cutter head in the axis direction of the cutter head in a sliding mode, the limiting block is located on the side, away from the tool turret body, of the cutter head, a limiting groove is formed in the tool apron, the limiting block is inserted into the limiting groove and limits the tool apron to be disengaged from the first installation groove, and a control mechanism used for controlling the limiting block to slide is further arranged on the tool turret body. By simplifying disassembly and assembly of the tool apron, the tool changing efficiency of the tool turret is improved, and the tool apron and the tool can be replaced by the manipulator.

A cutting tool for turning includes a cutting insert having a cutting edge, a holder for holding the cutting insert, a wireless communication unit for transmitting information based on a measurement result of a sensor attached to the cutting tool, an acceleration sensor installed in the holder, and a control unit for performing first control for controlling activation of the wireless communication unit based on the measurement result of the acceleration sensor.

The full-automatic feeding and discharging numerical control machine tool comprises a machine body, a machine tool body is arranged on the machine body, a tailstock and a main shaft are sequentially arranged on the machine tool body in the length direction, the tailstock and the main shaft are coaxially opposite, and a machine tool inner protective cover and a tool rest table used for installing a tool turret are arranged on the machine tool body. The tool rest table achieves Z-direction movement through a Z-axis linear guide rail, a Z-axis ball screw and a screw end bearing, is driven and controlled by a Z-axis servo driver, achieves X-direction movement through an X-axis linear guide rail, an X-axis ball screw and a screw end bearing, and is driven and controlled by an X-axis servo motor and an X-axis servo driver. The servo motor and the driver drive the tool rest table to move along the X-axis and the Z-axis, the tool turret automatically changes tools, and the main shaft rotates for machining. The tailstock and the main shaft are matched to automatically clamp a workpiece, the oil pressure station provides power, pipeline maintenance components are automatically lubricated, the chip removal mechanism cleans cuttings, full-process automatic machining is achieved, and efficiency and precision are improved.

The invention discloses an ultra-precision optical centering lathe, and relates to the technical field of high-end lens machining. The ultra-precision optical centering lathe comprises a support, a lathe body, a stand column, a rotary table, an upper light pipe assembly, a lower light pipe assembly and a sliding table assembly, the lathe body is arranged on the support, the lower end of the stand column is arranged on the lathe body, the rotary table is installed on the lathe body and suitable for fixing a mirror set to be machined, and the upper light pipe assembly is arranged on the stand column. The upper light pipe assembly is used for calibrating the optical axis of the upper surface of the lens set, the lower light pipe assembly is arranged on the support and used for calibrating the optical axis of the lower surface of the lens set, the sliding table assembly is arranged on the stand column, a four-station tool turret is installed on the sliding table assembly, an optical confocal system is arranged in a first station on the four-station tool turret, and the optical confocal system is arranged in a second station on the four-station tool turret. An automatic measuring system is arranged in a second station on the four-station tool turret, an outer circle turning tool is arranged in a third station on the four-station tool turret, and an inner circle turning tool is arranged in a fourth station on the four-station tool turret.

The application relates to a tool tower for a numerical control machine tool, comprising a tower body, a tool disc, a plurality of tool seats, a protective cover arranged on the tower body, wherein the protective cover comprises a cover body and a cover plate; a first matching part is arranged on the cover body, a second matching part is arranged on the cover plate, the first matching part and the second matching part are inserted and matched when the cover plate is connected with the cover body, so as to limit the rotation of the cover body relative to the cover plate; a plurality of first sliding grooves are arranged on the tool disc, and a plurality of tool seats are slidingly arranged in the first sliding grooves; a driving device is arranged on the tower body, and the driving device is used for driving the tool seats on the machining station to slide; a limiting ring block is rotationally arranged on the cover plate, and the limiting ring block blocks the notches of the plurality of first sliding grooves when the cover plate is connected with the cover body; when the cover plate moves away from the cover body, a space for disassembling the tool seats is formed between the cover body and the cover plate. The tool tower can protect the tool and facilitate the disassembly and assembly of the tool seats on the tool disc.

The invention relates to the technical field of tool turrets, in particular to a numerical control power tool turret which comprises a turret frame and a turret base, the turret base is connected to the turret frame in a sliding mode, the turret frame can move in the horizontal transverse and longitudinal direction, a turret body is installed on the turret base, a roller pin is arranged on the turret base corresponding to the turret frame, and an embedding groove is formed in the turret base corresponding to the roller pin. The roller pins are embedded in the embedding grooves, and the roller pins can abut against the tower in the embedding grooves. The tower base is connected to the tower frame in a sliding mode, the tower frame can move in the horizontal transverse and longitudinal direction, flexible movement of the tool turret in the horizontal transverse and longitudinal direction can be achieved, the tool turret body is installed on the tower base, machining operation is facilitated, the tower base abuts against the tower frame through the roller pin, the roller pin is embedded in the embedding groove, and the roller pin can rotate. Therefore, the friction between the original tower base and the tower frame can be converted, so that the friction between the tower base and the tower frame is reduced, the sliding of the tower base on the tower frame is smoother, and the condition that the tower base and the tower frame are damaged due to repeated friction after being used for a long time is reduced.

The lathe machining device comprises a tool rest, four lifting plates distributed in a rectangular mode are arranged at the upper end of the tool rest, lead screws are inserted into the upper ends of the lifting plates, the lead screws are in threaded connection with the lifting plates, the lower ends of the lead screws penetrate through the lifting plates and are rotationally connected with the upper end of the tool rest, and the lower ends of the lead screws are fixedly connected with the tool rest. A plurality of pressing rods are fixedly connected to the lower end of the lifting plate, a circle of square containing groove is formed in the outer side wall of the tool rest, the lower ends of the pressing rods slidably penetrate through the tool rest and extend into the containing groove, four connecting grooves distributed in a rectangular mode are formed in the inner bottom of the containing groove, and supporting blocks are slidably connected to the inner side walls of the connecting grooves; the upper end of the supporting block penetrates through the connecting groove and extends into the storage groove. Through the arrangement of the supporting block, the pressing rod and other mechanisms, the turning tool can be rapidly installed and fixed, meanwhile, a user can conveniently adjust the height of the turning tool, and practicability and convenience are improved.

The present invention realizes a holder with which it is possible to reduce the risk of damaging a work surface of a material to be cut. The width of a first ridge in the direction along a third reference axis is greater than the width of a third ridge in the direction along the third reference axis.

The invention discloses petroleum drill rod joint turning equipment in the technical field of petroleum drill rod machining, which comprises a base, a moving seat, a fixed seat and a double-station turning mechanism, the moving seat and the fixed seat are both provided with a rotating assembly, a conveying assembly and six positioning mechanisms, and each positioning mechanism comprises a first limiting wheel, a second limiting wheel, a moving assembly and an adjusting assembly. Feeding and discharging conveying of the petroleum drill rod is achieved through the conveying assembly, and the conveying assembly is matched with the rotating assembly and the six positioning mechanisms, so that the petroleum drill rod can sequentially pass through the feeding position, the first machining position, the second machining position and the discharging position, and feeding positioning of the petroleum drill rod, turning machining of the outer wall and the inner wall of a drill rod connector and discharging operation are sequentially conducted; the continuous processing treatment of the petroleum drill rod is realized; by arranging the moving structure and the moving seat, the position of the moving seat is adjusted so as to adapt to the petroleum drill rods with different lengths, and the positioning effect is improved by positioning the two side sections of the petroleum drill rod through the positioning mechanisms.

Utilities supplied through a first utility path of a turning tool holder via a docking device is supplied to a second utility path of an adjacent rotating tool holder through a communication means, there is no need to provide a complex hydraulic line, a pneumatic line and a coupler for receiving the utilities from the docking device at a rearward side of the rotating tool holder. A rearward size of the rotating tool holder may be minimized, so that even when the rotating tool holder is mounted on the turret, no interference occurs with the docking device in the rearward direction when the turret rotates. As a result, it is possible to use the rotating tool holder, to which utilities supply is necessary, even in the turret which is provide with the docking device.

The invention relates to the technical field of machine tool cutters, in particular to a pump cover chamfering cutter for high-pressure pump production, which comprises a cutter holder, a main cutter and an auxiliary cutter, the cutter holder is fixedly connected with a back plate, the back plate is provided with a mounting component for being assembled on a boring machine, and the middle part of the cutter holder is provided with a first shaft seat and is rotatably provided with a coupler and a rotary seat; after the tool apron is assembled, a driving shaft of the boring machine penetrates through the first shaft seat and is connected with the coupler to drive the revolving bed to rotate; a hoisting seat is annularly arranged on the edge of the rotary seat, and the center seat can be quickly assembled through the hoisting seat; an adjusting rail is fixed to the surface of the center base, a sliding base is slidably installed on the adjusting rail, a main cutter is fixed to the sliding base to adjust the rotating radius, and a pump cover center shaft hole is chamfered through the main cutter. An adjustable gear ring supporting structure is arranged on the rotary seat; the purpose of improving the chamfering efficiency and precision of the pump cover can be achieved.

A grooving or part-off tool assembly for Swiss-style machining includes a holder. The holder includes a resilient normally-closed holder clamp. In a preferred embodiment the holder clamp biases a blade holding a cutting insert against a pocket side abutment surface of a holder pocket.

The invention relates to a multi-station numerical control lathe, and belongs to the technical field of numerical control lathes, the multi-station numerical control lathe comprises a lathe workbench and a plurality of multi-station power tool turrets, and further comprises a guide rail, a sliding seat, a rotating seat, a first driving part, a second driving part and a third driving part, the length direction of the guide rails is parallel to the length direction of a clamped workpiece, the guide rails correspond to the multi-station power tool turrets one to one, the multiple guide rails are located on the same side of the workpiece, the sliding seats correspond to the guide rails one to one, and the sliding seats are arranged on the corresponding guide rails in a sliding mode. The rotating seat on the guide rail close to one side of the workpiece is arranged on the corresponding sliding seat, the rotating seat on the guide rail far away from one side of the workpiece is rotationally arranged on the corresponding sliding seat in the vertical direction, and the multi-station power tool turret is arranged on the rotating seat of the corresponding guide rail in a sliding mode. The multi-station power tool turret machining device has the advantages that machining flexibility is improved, and the multiple multi-station power tool turrets are fully utilized.

The invention relates to a device for forming a spiral groove in the surface of a cylindrical object. The device comprises a machine tool clamp used for clamping and driving the cylindrical object to be machined to rotate around the axis of the cylindrical object and a tool turret used for machining the spiral groove in the surface of the cylindrical object through a cutting edge of a tool. The tool turret is provided with at least two tools with the same structure, each tool is provided with at least two blade mounting positions to machine two or more spiral grooves, and the cutting directions of the blades corresponding to the two tools are different, so that the tool turret can respectively machine the spiral grooves with opposite rotating directions by means of the two tools, the tool turret does bidirectional axial movement along the cylindrical body, can be switched to one tool to machine a spiral groove in one rotating direction in the stage of moving from the near end to the far end, and can be switched to the other tool to machine a spiral groove in the opposite rotating direction in the stage of moving from the far end to the near end. And the two spiral grooves are staggered with each other to form diamond-shaped grids on the surface of the cylindrical body.

The invention discloses a turning and rolling composite cutter for machining a through hole, and particularly relates to the technical field of turning and rolling composite cutters, the turning and rolling composite cutter comprises a turning and rolling composite cutter body and an elastic assembly; the turning and rolling combined tool body comprises a tool bar body, a tool bit body, a retainer, a rolling needle, a lock nut and a turning tool. The elastic assembly comprises an external thread block, an internal thread groove, a square sliding groove, a square sliding plate, a spring and an abutting block. The external thread block is fixedly arranged on the side, close to the tool bar body, of the tool bit body. An inner thread groove is formed in the side, close to the tool bit body, of the tool bar body. A square sliding groove is formed in the cutter bar body. The square sliding plate is slidably arranged in the square sliding groove. Two ends of the spring are fixedly connected with the inner wall of the square chute and the square sliding plate; the abutting blocks are fixedly arranged on the side, away from the spring, of the square sliding plate in an annular array. The tool bar is reasonable in structural design, the tool bar body and the tool bit body are designed separately, and the tool bar body and the tool bit body can be installed more stably through the acting force generated when the spring contracts.

An indexing system for a lathe tool holder comprises a lower housing assembly with a rotary driver shaft interfaced with a tool turret and rotatable by the tool turret, a rotary driver clutch secured to the rotary driver shaft, and an outer rotary comprising an internally threaded pocket. A rotary pusher with an externally threaded portion mates with the internally threaded pocket. Rotation of the rotary driver shaft causes the rotary pusher to move linearly without rotation. An upper housing assembly mounted on the lower housing assembly comprises a sawtooth connection for a multiple insert lathe tool holder head. A camshaft driver interfaces with the tool holder head and has a cam channel that circumscribes a path that is interfaced with a stationary cam pin. Linear movement of the rotary pusher causes rotation of the camshaft driver and thereby rotation and linear movement of the tool holder head.

The invention discloses a special turning device for a water pump shell, and belongs to the technical field of water pump turning, the special turning device comprises a main body mechanism for placing the water pump shell to be turned, and the main body mechanism is provided with a turning tool mechanism for turning the water pump shell and a driving mechanism for driving the turning tool mechanism to lift and rotate; by arranging the four-station rotating mechanism capable of achieving automatic switching, continuous feeding and machining of the water pump shell are achieved, due to the matched design of a quarter gear and a shifting rod mechanism, stations are automatically switched after two times of turning, and the production efficiency is remarkably improved; the turning tool mechanism is linked with an external air pump through an inner dirt suction pipe and an outer dirt suction pipe, metal chippings are adsorbed and removed in real time in the turning process, and the situation that the machining quality is affected or a tool is damaged due to accumulation of the chippings is avoided; the center bearing, the side bearings and the rolling ball structure are arranged, friction and vibration of moving parts are reduced, it is guaranteed that equipment operates stably for a long time, and the service life is prolonged.

The invention discloses a tool turret oblique insertion type rapid power head tool apron replacing mechanism and method, and relates to the technical field of machine tool machining. The mechanism comprises a base, the front face of the base is rotationally connected with a tool turret and a fixed inner seat ring, and tool aprons with tools are inserted in the periphery of the tool turret; a first fixing and locking device and a second fixing and locking device are arranged in the base and the inner seat ring, the first fixing and locking device primarily fixes the non-working tool apron, and the second fixing and locking device secondarily fixes the working tool apron. The first device comprises a first hydraulic cylinder, a push plate and a first locking plate, and is clamped with a locking cutter seat through a wedge-shaped groove; the second device comprises a second hydraulic cylinder and a second locking plate, and the second hydraulic cylinder deflects to abut against the first locking plate for reinforcement. The method comprises the steps of tool apron insertion, primary locking and detection, rotary switching and secondary locking. Through double locking and state detection, the stability of the tool apron and the tool changing efficiency are improved, the machining precision is guaranteed, and the device is suitable for automatic production.

A rotary tool (2) is specified, comprising a cutting insert (4) having at least one cutting portion (10) and a fastening portion (12), where the fastening portion (12) has a fastening surface (40), and a clamping holder (6) having a support projection (26) and a support (24), where the support projection (26) and the support (24) are configured to support the cutting portion (10) and the fastening portion (12). Wherein the fastening part (12) has a fastening part upper side (30) and a fastening part lower side (32), each of which is designed in a stepped manner in the axial direction (A), and wherein an upper side part surface (34) of the fastening part upper side (30) bears against a support projection surface (52) of the support projection (26), and an underside part surface (36, 38) of the fastening part underside (32) abuts against the support (24). A cutting insert (4) and a clamping holder (6) are also specified.

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 invention provides a tool apron device for turning tool chip breaking and a control method, and relates to the technical field of machining. The tool apron device for turning tool chip breaking comprises a tool turret body, an X-direction chip breaking tool apron used for X-direction vibration or a Z-direction chip breaking tool apron used for Z-direction vibration is selectively arranged at the bottom of the tool turret body, and the X-direction chip breaking tool apron and the Z-direction chip breaking tool apron are installed at the same position of the tool turret body through bolts. According to the turning tool chip breaking tool apron device and the control method, high-frequency reciprocating vibration needed by chip breaking is completely limited in an independent chip breaking tool apron and is achieved by a servo motor of a tool turret through a mechanism in the tool apron, an X-axis lead screw, a Z-axis lead screw and a guide rail of a machine tool do not participate in chip breaking motion any more, only normal main cutting feeding is executed, and the working efficiency is greatly improved. Abnormal abrasion caused by the chip breaking function is fundamentally eliminated, the precision retention period and the service life of a machine tool are greatly prolonged, and the maintenance cost is reduced.

The present invention discloses an insert adaptor for parting off having an adaptor index axis and comprising: parallel and planar adaptor first and second sides connected by an adaptor peripheral surface which extends peripherally around the adaptor; the adaptor index axis extending through the center of the first and second sides; wherein the adaptor peripheral surface is formed with a plurality of pockets which are configured for resilient clamping and bearing surfaces extending between the pockets; characterized in that: the insert adaptor has a material volume of greater than 50% of an imaginary cylinder encompassing the insert adapter; and each of the bearing surfaces are straight.

A cutting tool has a shaft portion and a sensor portion configured to surround a part of the length direction of the shaft portion. The sensor portion includes a sensor module including a plurality of first sensors that detect a first physical quantity of the shaft portion, a substrate electrically connected to the first sensors, and a wireless communication portion electrically connected to the substrate and that transmits a signal including information of the first physical quantity detected by the first sensors to the outside, and a housing that accommodates the sensor module. The region of the shaft portion surrounded by the sensor portion includes a first region that is a 4n-sided polygon when viewed in the direction along the rotation axis. The above n is a natural number of 2 or more. When viewed in the direction along the rotation axis, the plurality of first sensors are disposed on at least two faces of the outer peripheral surface of the first region that are 90° to each other by a perpendicular line of the rotation axis among each face of the outer peripheral surface of the first region corresponding to each side of the 4n-sided polygon.

The invention discloses a turning and milling device for a turning and grinding finish machining compound machine tool and the turning and grinding compound machine tool, and particularly relates to the technical field of metal machining, the turning and milling device comprises a turning and milling cutter tower and a cutter holder, a sliding seat used for fixing a turning tool is connected to the cutter holder, and a pre-tightening mechanism used for pushing the sliding seat to move towards one side of a workpiece is connected to one side of the cutter holder; the mounting base and the locking device are used for rigidly supporting the sliding seat; the tool retracting mechanism comprises a locking device and a traction cable, when the turning tool vibrates violently, the traction cable pulls the locking device, the locking device can act on the mounting base, so that the locking device loses rigid support on the sliding base, and meanwhile, the sliding base drives the turning tool to retract. And the locking device is pulled, so that the locking device can instantly respond and withdraw the tool for avoiding, and chain accidents such as tool tipping, workpiece scrapping and damage to core parts of a machine tool are fundamentally avoided.

The objective of the present invention is to provide a quick-change type tool shank structure with high positioning accuracy. [Solution] The tool holder includes a head portion, a tool holder, and a tool shank which are connected in sequence, a communication through hole is provided in the center of the tool holder and the tool shank, two threaded bolts are provided in the through hole, both ends of the two threaded bolts are connected to the head portion and the tool shank, respectively, and a head portion fitting hole is provided on the inner cylindrical surface of the end of the through hole of the tool holder which is closer to the head portion, and the head portion fitting hole is fitted and connected to the head portion. The present invention has the following advantageous effects: The head portion and the tool shank are connected by two threaded bolts, and the tool holder does not need to be threaded, so that a hard alloy material can be used for the tool holder, and further, in combination with the structure of the fitting hole, the technical problem that the structure of the conventional tool shank is too complicated is solved, and a tool holder structure which is simple in structure and has high positioning accuracy is obtained.

The utility model discloses a portable cutter mounting turret, which belongs to the technical field of turret equipment and comprises a cutter head, an insertion hole is formed in the outer side wall of the cutter head, the cutter head is rotatably connected with a rotating ring through the insertion hole, a bearing is attached to the top of the rotating ring, a fixing ring is attached to the top of the bearing, and the fixing ring is connected with the cutter head through the insertion hole. Fixing holes are formed in the outer side wall of the fixing ring and the outer side wall of the cutterhead, a tool bit seat is inserted into the inner side wall of the fixing ring, a mounting hole is formed in the top of the tool bit seat, and a fastening ring is in threaded connection with the top of the tool bit seat. According to the portable tool mounting turret, a rotating ring and a bearing are mounted in an inserting hole through a fixing ring, a tool bit is inserted into a mounting hole, and the tool bit is fixed in the mounting hole under the limitation of a fastening ring, so that the mounting of a plurality of different tool bits can be realized through a plurality of inserting holes formed in the outer side wall of a tool disc; and various tools can be conveniently switched for use, the tool replacement speed is effectively increased, and the machining efficiency is improved.

The utility model discloses a numerical control machine tool servo power tool turret which comprises a driving motor, the output end of the driving motor is in transmission connection with a driving shaft, the tail end of the driving shaft is axially provided with a mounting groove, a connecting shaft is movably inserted in the mounting groove, the tail end of the connecting shaft is fixedly connected with a cutter head, an inserting groove is horizontally formed in the center of the connecting shaft, and an inserting block is movably connected in the inserting groove. The inserting block is fixed in the mounting groove, the top surface of the inserting block is movably connected with a locking piece, a plurality of grooves matched with the locking piece are horizontally formed in the inner side of the connecting shaft, and the locking piece is movably connected in two symmetrical grooves. The cutterhead is connected into the mounting groove in the driving shaft through the connecting shaft, and the locking piece connected with the connecting shaft is movably connected into the mounting groove, so that the cutterhead and the driving motor are convenient to disassemble and assemble, and the damaged cutterhead is convenient to disassemble and maintain.

In a cutting tool having an indexable cutting insert (20) with exactly four cutting portions (26), the cutting insert is removably securable to an insert holder by a fastener. The cutting insert (20) has two opposing end surfaces (22) with a peripheral side surface (24) extending therebetween, and each cutting portion (26) has a major cutting edge (28) formed by the intersection of a rake surface (30) and a relief surface (32). The peripheral side surface (24) has first and second pairs of opposing side surfaces (34, 36) which include the four relief surfaces (32) and the four rake surfaces (30), respectively. In an end view, four cutting points on the four major cutting edges (28) define the transitions between the first and second pairs of opposing side surfaces (34, 36), and a minimum first length dimension between the second pair of opposing side surfaces (36) is less than six-tenths of a minimum second length dimension between two of the four cutting points.