314results about "Reaming tools" patented technology

A stop for use with an electric drill bit, the stop having at least one threaded sleeve for positioning the stop relative to a surface into which the drill bit will extend. The stop may have both an inner and an outer sleeve. The sleeves are mounted coaxially, one inside the other about the drill bit. One of the sleeves, preferably the inner sleeve, provides coarse adjustment of the position of the shoulder relative to the tip of the bit, while the other, preferably the outer sleeve, provides fine adjustment of the position of the shoulder relative to the top of the bit.

A cutting tool system may include a tool body, a flexible internal pressure chamber, and at least one cutting edge. The flexible internal pressure chamber may be disposed within the tool body. The at least one cutting edge may be attached to the tool body. The flexible internal pressure chamber may be configured to elastically deform, due to pressure within the flexible internal pressure chamber, which in turn may deform the tool body, which in turn may change a position of the at least one cutting edge attached to the tool body.

The utility model discloses a non-standard reamer with an angle R at the root. The non-standard reamer comprises a reamer rod, and a reamer handle is arranged below the reamer rod. A cutting blade is installed below the cutter handle, an R angle is arranged at the end of the cutting blade, an arc-shaped groove is formed in the cutter handle, a heat dissipation groove is formed in the cutter handle, the arc-shaped groove is communicated with the heat dissipation groove, the heat dissipation groove is annularly formed, and an auxiliary assembly is installed on the outer side of the heat dissipation groove. According to the non-standard reamer with the R angle at the root, the arranged cutting blades can be conveniently matched with the reamer handle for machining, machining can be conducted at the same time through the non-standard design of reaming and back chipping, the problem that the service life is shortened due to inconsistent abrasion speeds is solved, and the problem that the maintenance cost is increased due to separate treatment of the cutting edges is solved; the R angle on the cutting piece can be conveniently reamed and formed, the problem that the overall machining time is prolonged due to the fact that a tool needs to be replaced is solved, and the problem that existing tool connecting marks are troublesome to process is solved.

The invention relates to the technical field of metal cutting tools, in particular to a novel spiral groove hard alloy reaming tool and an efficient chip removal structure thereof.The novel spiral groove hard alloy reaming tool comprises a reamer and a main cutting edge arranged at the bottom of the reamer, a cutting set is arranged on the lower portion of the reamer and comprises a first chip removal groove and a second chip removal groove, and the first chip removal groove and the second chip removal groove are formed around the surface of the reamer; the size of the first chip groove is larger than that of the second chip groove. Wherein the edge is lower than the auxiliary cutting edge, and an inclined plane included angle alpha used for assisting chippings to slide into the second chip groove is formed between the auxiliary cutting edge and the edge; the auxiliary cutting edge is flush with the surface of the reamer and is flush with the two ends of the main cutting edge, through the design of the included angle alpha between the edge of the first chip discharging groove and the auxiliary cutting edge and the cooperation of the stepped structure that the edge is lower than the auxiliary cutting edge, the retention space of chips in a transition area is thoroughly eliminated, spiral scratches caused by chip scraping of a traditional cutter are avoided, and the service life of the reamer is prolonged. And a high-precision reference surface is provided for subsequent tapping.

A method for producing a cutting tool including a tool body including a hard coating, the method comprising: applying the hard coating to the tool body at least in an area of a cutting edge, a flank, and a chipping surface; depositing the hard coating on a surface of the tool body, of the cutting tool in an area of the cutting edge, of the flank adjacent to the cutting edge, and of the chipping surface adjacent to the cutting edge; sharpening the cutting edge that is provided with the hard coating and that forms a dull rounded edge by partially removing the hard coating in the area of the flank of the cutting edge by laser machining to form a sharpened cutting edge so that an angle δ is enclosed between a first geometric plane in which a surface of the tool body extends.

A reamer includes a shank portion extending from a rear end and a cutting portion extending from the shank portion to a front end. The cutting portion includes a plurality of cutting teeth separated by gashes. Each cutting tooth having a cutting edge extending in a longitudinal direction from the front end to proximate the shank portion. The cutting portion includes a margin trailing each cutting edge and extends along each cutting edge to proximate the shank portion. Each cutting tooth also has a primary relief formed between the cutting edge and the front end and a secondary relief extending longitudinally between the margin of one cutting tooth to the cutting edge of an adjacent cutting tooth. A width, W, of each cutting tooth increases in a radially outward direction with respect to the central, longitudinal axis when viewed from the front end of the reamer.

A reamer includes a shank portion extending from a rear end and a cutting portion extending from the shank portion to a front end. The cutting portion includes a plurality of cutting teeth separated by gashes. Each cutting tooth having a cutting edge extending in a longitudinal direction from the front end to proximate the shank portion. The cutting portion includes a margin trailing each cutting edge and extends along each cutting edge to proximate the shank portion. Each cutting tooth also has a primary relief formed between the cutting edge and the front end and a secondary relief extending longitudinally between the margin of one cutting tooth to the cutting edge of an adjacent cutting tooth. A width, W, of each cutting tooth increases in a radially outward direction with respect to the central, longitudinal axis when viewed from the front end of the reamer.

The invention relates to a machining tool and a combined machining method for a radial eccentric stepped hole of an injector disc, and belongs to the field of eccentric stepped hole machining. The machining tool comprises a detachable guide drill, a detachable reamer, a detachable rose reamer and a detachable reamer. According to the structural characteristics of a cutter and a product, eccentric stepped hole machining is divided into four stage processes of drilling, broaching, chamfering and reaming, and drilling, broaching and chamfering, allowance removal and finishing machining are sequentially completed. And step-by-step machining of the eccentric chamfering stepped hole is achieved. The cutter material, the coating, the cutting edge angle and the cutter split structure are machined step by step, the service life of the cutter is prolonged, and the machining efficiency is improved by more than three times. The combined machining method is adopted, cutter deflection is effectively restrained, chamfering uniformity errors are reduced, aperture control is improved, the roughness of the inner surface of the hole is reduced, the machining efficiency of the injector disc is improved, and the combined machining method is suitable for efficient and precise machining of the spaceflight complex step eccentric hole.

The combined alloy reamer convenient to replace comprises an alloy reamer body arranged at the bottom of a mounting base, five arc-shaped clamping plates are rotationally connected to the periphery of the bottom of the mounting base, the arc-shaped clamping plates are annularly arrayed at the bottom of the mounting base, movable gaskets are detachably installed on the opposite sides of the arc-shaped clamping plates, and the movable gaskets are arranged on the bottom of the mounting base. The surface of the movable gasket is attached to the surface of the alloy reamer, a square inserting rod is arranged at the bottom of the mounting base, a square inserting groove used in cooperation with the square inserting rod is formed in the top of the alloy reamer, and the surface of the mounting base is sleeved with a sleeve. The square inserting groove in the alloy reamer is aligned with the square inserting rod for insertion, then the sleeve slides downwards to drive the arc-shaped clamping plate to rotate, the alloy reamer is clamped and locked through the movable gasket, and the movable gaskets with different thicknesses are replaced according to the actual size of the alloy reamer. And therefore, the alloy reamers with different sizes can be mounted and replaced.

The application discloses a cutter for machining a tapered hole and relates to the technical field of cutters. The cutter for machining a tapered hole is characterized by the following: an inner lining assembly is arranged in the cutter body; when the cutter body starts to perform a hole opening operation on a hole opening plane, the cutter body will vibrate; the rubber sleeve arranged in the cutter body can buffer and absorb the vibration and has a protection effect, thereby preventing resonance; the abutting piece and the connecting column arranged in the cutter body can improve the structural strength of the cutter body and the supporting effect from the inside to the outside, thereby preventing the cutter body from being bent or broken during hole opening; the service life of the cutter body is prolonged; the cutter body is matched with the cutting edge; the cutter can open a tapered hole with a certain precision; the generated metal scraps can be automatically discharged through the slag discharge groove; the cutter can prevent the problem of continuous rotation and biting of the cutter in the tapered hole; and the cutter has an auxiliary effect on improving the hole opening precision.

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.

A cutting tool includes a replaceable cutting head including a forward cutting portion and a rearward mounting portion and a head through hole extending therethrough. The mounting portion includes a male coupling member. The male coupling member includes a conically shaped head abutment surface. The cutting tool includes a female coupling member including a conically shaped forward holder abutment surface and an internal thread. The cutting tool includes a fastening member having an external thread. When the cutting tool is in a locked position, the male coupling member is removably retained in the female coupling member by the fastening member located in the head through hole, the fastening member external thread and the holder internal thread being threadingly engaged with each other. The head abutment surface abuts the forward holder abutment surface thereby forming a Morse taper coupling between the male and female coupling members.

The machine tool comprises a base, a main shaft, a cutter bar locking screw rod, the rigid reamer, a clamp, a tailstock and an air cylinder, a movable center is arranged at the end, close to the clamp, of the tailstock, and the end, away from the rigid reamer, of the cutter bar locking screw rod is connected with a driving mechanism through a transmission piece; the lower end of the clamp is connected with the base in a sliding mode, and a positioning hole is formed in the position, corresponding to a workpiece, of the clamp. According to the machine tool for machining the bimetal lining through the rigid reamer, in the machining process, the rigid reamer is connected with the main shaft through the cutter bar locking screw rod, so that the rigid reamer only rotates on the power source, a workpiece has radial micro-compensation floating in the axial movement process, good follow-up movement is kept, the movement inertia of the workpiece is relieved, and the machining precision of the bimetal lining is improved. And microscopic size change caused by radial movement of the relative rigid reamer is reduced.

The utility model discloses a reaming and grinding integrated cutter, which belongs to the technical field of machining, and specifically comprises a front-end reamer, a rear-end grinding cutter and a cutter handle part which are integrated, the front-end reamer and the rear-end grinding cutter are respectively provided with at least three cutting edges, the front-end reamer is provided with a cutting chamfer, and the rear-end reamer is provided with a cutting groove. And the edge diameter of the cutting edge on the front-end reamer is smaller than that of the rear-end grinding cutter. According to the utility model, the cutter can be reamed and then ground in a hole, and the problems of short service life of a reamer, poor reaming quality and the like caused by poor precision of a pre-hole are solved. The requirement for machine tool precision is lowered, meanwhile, machining efficiency is improved, tool configuration is reduced, and tool cost is lowered; meanwhile, the diamond grinding reamer part improves the hole wall quality, and the machining quality is stable.

A reaming hole machining tool includes a shank that can be mounted on a rotating machine, an axis extending longitudinally along the shank, and a cutting part for performing cutting machining, which includes an end face in the feed direction. From the end face in the feed direction of the tool for reaming holes to the axis of the shank, a cutting part, a leading calibration part, and a calibration part are sequentially arranged. The two axial ends of the leading calibration part are respectively connected to the cutting part and the calibration part. The calibration intersection line formed by the circumferential side wall of the leading calibration part on the radial plane is inclined to the axis, and the included angle is less than 90°. The reaming hole machining tool of the present invention is used to perform reaming machining of holes, especially reaming machining of holes formed in metal materials, reduce or eliminate the feed marks on the hole wall, the hole wall is smooth, the surface roughness reaches below Ra0.5, and it presents a bright and uniform silver-white color.

The invention provides a dual-V-shaped clamping multi-specification adaptive modular cutter with chip removal and cooling functions, and relates to the technical field of hole machining cutters, the dual-V-shaped clamping multi-specification adaptive modular cutter comprises a cutter bar and a cutting head, the cutting head is provided with a connecting hole, and a positioning rod is arranged at the lower end of the cutting head; the top of the cutter bar comprises a V-shaped end, the inner side of the V-shaped end comprises two V-shaped faces, and the V-shaped end penetrates through the connecting hole through a locking bolt to achieve fixation of the cutter bar and the cutting head. A positioning hole is formed in the bottom of the V end, a pre-tightening assembly matched with the positioning hole is arranged at the lower end of the positioning rod, five-face positioning of the cutting head is achieved through matching of the V end on the cutter bar and the supporting face, in the installation process, by installing the pre-tightening assembly in advance, the cutting head can be conveniently installed in the V end, pre-tightening force can be provided, and therefore the cutting head can be installed conveniently. And the cutting head and the V end can be conveniently fixed by the locking bolt.

Reaming tool for reaming very precise bores, especially in gray and ductile iron, comprising a clamping element adapted for clamping in the clamping devices of machine tools, and a cutting element according to the invention, on the circumferential part of which at least two cylindrical longitudinal support surfaces with an angular distance of 60° to 160° are formed, and on the remaining circumference of the cutting element at least three cutting teeth with longitudinal cutting edges and face cutting edges are formed, wherein a cylindrical longitudinal support surface is formed behind the first cutting tooth in the working direction of rotation and the other cylindrical longitudinal support surface is formed in front of the last cutting tooth in the working direction of rotation, characterized in that at the first cutting tooth (4) the distance (L1) of the intersection point (P1), i.e. the longitudinal cutting edge (9) and the inclined cutting edge (10), from the face plane (π) is smallest and at the last cutting tooth (4'') the distance (L1'') of the intersection point (P1'')that is, the longitudinal cutting edge (9'') and the inclined cutting edge (10'') are greatest from the face plane (π), and at least one cutting tooth (4') is formed between the cutting teeth (4) and (4'') with a distance (L1') of the intersection point (P1'), i.e., the longitudinal cutting edge (9') and the inclined cutting edge (10'), from the face plane (π), wherein, for individual cutting teeth (4') and (4), the distances (L1') and (L1) of the intersection points (P1') and (P1) from the face plane (π) decrease from the distance (L1'') in the working direction of rotation, and the distances (L2) and (L2') between the face plane (π) and the intersection points (P2) and (P2'), i.e., the cylindrical longitudinal support surfaces (6) and (6') and the lead-in surfaces (5) and (5'), decrease by at least 0.2 mm as the distance (L1'') between the frontal plane (π) and the intersection point (P1'') are larger.

The invention relates to a drilling method, in particular for a turbine shaft of an aircraft turbine engine, which method is implemented by a drilling machine (100) including a drill rod (8), a cutting tool (4) mounted on a free end of the drill rod, and an anti-vibration ring (10) positioned on the drill rod behind the cutting tool, the anti-vibration ring including a sleeve including a bore extending longitudinally coaxially between a front end and a rear end of the sleeve, as well as a first absorption means positioned in the bore and a second absorption means positioned on an outer circumference of the sleeve, the method including steps of: a) placing the anti-vibration ring on the drill rod near a free end of the drill rod; b) securing the cutting tool to the free end of the drill rod; c) drilling a bore to be made in the turbine shaft by pushing, during which the anti-vibration ring is inserted into an inlet (21) of the bore to be made.

The drilling and reaming integrated cutter for the engine cylinder block relates to the technical field of engine cylinder block machining and comprises a drill bit and a reinforcing assembly, a cutter containing groove is formed in the side edge of the drill bit, a reamer is arranged in the cutter containing groove, a fixing hole is formed in the side edge of the reamer, an inserting rod is installed at the lower end of the reamer, and the inserting rod is connected with the reinforcing assembly. The reinforcing assembly used for installation and reinforcement is arranged at the lower end of the interior of the cutter containing groove and comprises a reinforcing plate, a limiting hole, a spring and an inner groove, the limiting hole is formed in the middle of the upper end of the reinforcing plate, the spring is installed at the lower end of the reinforcing plate, and the inner groove is formed in the outer portion of the spring. According to the drilling and reaming integrated cutter for the engine cylinder body, the cutter containing groove is used for positioning and rapid installation of the reamer, after the cutting edge of the detachable and replaceable reamer is abraded, the cutter can be continuously used by replacing the blade, the grinding and replacing cost of the cutter is reduced, the service life of the cutter is prolonged, and the machining efficiency of the cutter is improved.

The utility model relates to the technical field of high-precision reamers, and discloses a fine-adjustable reamer which comprises a reamer handle, an adjusting fixing block is fixedly connected to the top of the reamer handle, and a T-shaped sliding groove is formed in the top of the adjusting fixing block. The limiting ring is rotated through the operation groove, so that the limiting ring rotates along the limiting groove, the limiting ring drives the hexagonal adjusting block, the hexagonal adjusting block rotates the threaded rod through the hexagonal avoiding groove, and the threaded rod rotates and descends towards the interior of the reamer handle along the adjusting fixing block; the inner wall of the threaded rod slides downwards along the outer wall of the adjusting block through the hexagonal receding groove, meanwhile, the threaded rod pulls down the adjusting block, so that the adjusting block extrudes the reamer outwards through the inclined face, the reamer drives the T-shaped sliding block to expand outwards along the T-shaped sliding groove, the size of the reamer after abrasion is made up, and the flexibility of the reamer is improved. And the scrapping probability of the reamer is reduced, so that higher machining precision and flexibility are ensured.

The utility model belongs to the technical field of machining, and particularly relates to a floating self-centering reamer which comprises a reamer sleeve, a ball screw and a reamer body, the reamer sleeve is provided with evenly-distributed threaded holes in the radial direction of the reamer sleeve and provided with a square hole in the axial direction, one end of the reamer body is provided with a square boss in the axial direction, and the square boss of the reamer body is placed in the square hole of the reamer sleeve. According to the floating self-centering reamer, the problem that the axis of the reamer does not coincide with the rotation axis of the main shaft in the reaming process can be effectively solved, the reaming quality is improved, the designability of the floating self-centering reamer is good, the structure is simple and reliable, and the floating self-centering reamer is suitable for popularization and application. And the reaming quality of the precision hole can be simply and efficiently improved.

A multi-part modular tool rotatable about a longitudinal tool axis (A), comprising: a machining head; a first holding element comprising a body elongated along the longitudinal axis (A) of the tool, in which a passage extends along the longitudinal axis (A) of the tool; a second holding element which can extend in the passage of the first holding element; wherein the machining head can be connected to the second holding element in such a way that the machining head is fixed firmly to the first holding element at least in the axial direction (A) and / or in the radial direction (R), and wherein the passage of the first holding element and the second holding element are adapted to one another such that during a connection process in which the machining head is connected to the second holding element, the second holding element is movable relative to the first holding element.

The utility model discloses a reamer with a length adjusting function. The telescopic reamer comprises a reamer rod, a telescopic assembly arranged in the reamer rod and a locking assembly arranged on the surface of the front side of the telescopic assembly, the telescopic assembly comprises a bottom groove formed in the lower end of the reamer rod, and when the length of the reamer needs to be adjusted, a rotary knob is twisted to drive a first bevel gear connected with the rotary knob to rotate; a second bevel gear is driven to rotate through meshing of insections arranged on the outer wall, the second bevel gear rotates to drive a screw connected with the second bevel gear to rotate, a telescopic column stably slides up and down in a telescopic groove, and then the distance between a reamer head installed at the upper end and a reamer rod can be stably adjusted. The bolt is twisted to be meshed in the screw groove to move backwards, the clamping block rotationally connected with the rear side surface of the bolt is driven to move backwards, the clamping lines on the rear side surface of the clamping block are clamped and embedded in the clamping lines arranged on the surface of the telescopic column, therefore, the length adjustment of the cutter bar is effectively locked, and the stability after adjustment is guaranteed.

The cutting tool component includes a cutting portion (38). The cutting tool component further includes a plurality of guide pads (56) projecting radially outward from the cutting portion. At least the cutting portion and the plurality of guide pads are manufactured by additive manufacturing, and the plurality of guide pads are integrally formed with the cutting portion in a unitary, one-piece construction. A rotary cutting tool is provided having a cutting insert removably attached to the cutting tool component.

The utility model relates to a PCD (Polycrystalline Diamond) integral diamond drilling reamer, which comprises a drill bit structure welded at the end part of a metal reamer body, a connecting groove is formed in the drill bit structure and the metal cutter body in a penetrating mode. A feed angle is arranged at the radial end of the drill bit structure, and the angle range of the feed angle is 30 + / -1 degrees. A chisel edge and a shearing angle are arranged on the drill bit surface close to the rear end of the feed angle; a round edge is arranged at the tail end of the chisel edge; a step-shaped tool withdrawal groove is formed behind the radial end part; a first tool withdrawal groove rear angle, a second tool withdrawal groove rear angle and a third tool withdrawal groove rear angle are sequentially arranged on the step-shaped tool withdrawal groove. The angle range of the relief angle of the first tool withdrawal groove, the relief angle of the second tool withdrawal groove and the relief angle of the third tool withdrawal groove is 10 + / -1 degrees; the overall inclination angle of the step-shaped tool withdrawal groove ranges from 8 degrees to 15 degrees. The multi-step variable-diameter deep hole machining device can be specially used for machining multi-step variable-diameter formed deep holes of non-ferrous metals and non-metals in the industries of the non-ferrous metals and the non-metals, and is high in hardness and good in wear resistance and tipping resistance.

The present invention relates to the technical field of bearing processing, and particularly relates to a PCD bearing hole forming reamer and its equipment, including a cutter body, the cutter body includes a cutter head, one end of the cutter head is welded with a cutter handle in the middle, the cutter handle is circular and its length is greater than the length of the cutter head; a plurality of cutting grooves are evenly arranged at the end of the cutter head away from the cutter handle, and PCD cutting blades are fixedly installed on the inner sides of the plurality of cutting grooves; the PCD cutting blades are made of PCD (polycrystalline diamond); the edge-opening parts of the plurality of PCD cutting blades are all located outside the cutter head; through the setting of the PCD cutting blades, the overall rigidity of the reamer is improved, and at the same time the service life of the reamer is increased, saving the time occupied by frequent tool changing and tool alignment; in addition, the PCD cutting blades can adapt to the working state of high-speed rotation, and do not require the use of cutting fluid during the grinding work, so that the processing time of the reamer for the bearing is shorter, thereby increasing the efficiency of the bearing processing work.

To provide a technology that safely and reliably removes chips and other residues from machine tools while suppressing a decrease in work efficiency. [Solution] The fluid ejection tool 50 is attached to the spindle 3 of a machining center 1A capable of ejecting fluids such as coolant liquid in a center-through manner. The fluid ejection tool is provided on the tip end 54 side and has a lateral through-hole 63 that penetrates to the outside from the inner circumferential surface 60b of the internal flow path 60 and ejects the fluid that has passed through the internal flow path to the outside. The tip end is provided with a tip through-hole 61 that penetrates to the outside along the tool axis. The lateral through-hole is inclined so that the outer opening 63d is closer to the base than the inner opening 63c. The lateral through-hole is provided at a position that is a first distance from the tip and at a position that is a second distance, and both the first distance and the second distance are less than or equal to 1 / 4 of the length of the part of the tool that protrudes from the tool holder along the tool axis direction.

The utility model belongs to the technical field of cutters, and discloses a welding type reaming cutter which comprises an alloy part and a steel body part which are welded into a whole. A spiral alloy groove is formed in the alloy part, a blade part of the alloy part is sequentially provided with a first step section, a second step section and a third step section from front to back, the heights of the first step section, the second step section and the third step section are gradually increased, and cutting cones are arranged at the front end of the first step section, the front end of the second step section and the front end of the third step section. According to the welding type expanding reamer, the defects of insufficient rigidity, poor wear resistance and short service life in the prior art are overcome by the alloy part; the tool is integrated with expanding and reaming, so that the defect of frequent tool changing in the prior art is reduced, the position degree deviation caused by secondary machining due to tool changing is avoided, and the product quality is improved.

The present invention relates to a drill bit and a method of manufacturing a perforated article. In the case where the rigidity of the main shaft of a perforating machine is sufficient, it goes without saying, but even in the case where perforation is performed using a hand-held tool rotation device or the rigidity of the main shaft of the perforating machine is low, a workpiece composed of a composite material or a metal or the like can be perforated with high accuracy. The drill bit of the embodiment has a first cutting edge formed on the leading end side in such a manner that the leading end angle is continuously or discontinuously reduced from the leading end side to the trailing end side, and on the other hand, the clearance angle is continuously or discontinuously reduced from the leading end side to the trailing end side, and is used to perforate a workpiece to form a pilot hole; a second cutting edge formed by being positioned away from the first cutting edge toward the trailing end side, and used to perform finishing of the pilot hole, and having a clearance angle at the maximum diameter position; and a vibration-damping portion formed between the first cutting edge and the second cutting edge, and reducing vibration of the second cutting edge by being inserted into the pilot hole processed by the first cutting edge.

The reamer comprises a reamer head, the upper end of the reamer head is fixedly connected with a clamping rod, the lower end of the reamer head is fixedly connected with a cooling liquid storage disc, an assembling groove is formed in the center of the lower surface of the cooling liquid storage disc, clamping grooves evenly penetrate through the top face of the assembling groove, and the clamping grooves are fixedly connected with the clamping rod. A cutter bar is installed below the cooling liquid storage disc, inserting rods are evenly fixed to the end face of the top end of the cutter bar, reaming blades are evenly fixed to the outer wall of the cutter bar, rough machining straight blades are arranged on the left side blade edges of the reaming blades, and finish machining round blades are arranged on the right side blade edges of the reaming blades. The reamer edge is divided into two edge structures of a rough machining straight edge and a finish machining round edge, the edge of the rough machining straight edge is straight and used for rough machining, the edge of the finish machining round edge has radian and used for finish machining, the reamer can finish rough machining, finish machining can be achieved, the reamer has double purposes, the rough machining and finish machining can be switched only by changing the turning direction of the reamer, and convenience and rapidness are achieved. And the trouble of disassembling and assembling the cutter and correcting and setting the cutter again is avoided.