CN113458498A

CN113458498A - Portable reamer with replaceable cutting edge

Info

Publication number: CN113458498A
Application number: CN202110652560.5A
Authority: CN
Inventors: 朱燕华
Original assignee: Wuxi Ralf Tools Co ltd
Current assignee: Wuxi Ralf Tools Co ltd
Priority date: 2021-06-11
Filing date: 2021-06-11
Publication date: 2021-10-01
Anticipated expiration: 2041-06-11
Also published as: CN113458498B

Abstract

The embodiment of the application provides a portable interchangeable cutting edge reamer, relates to auto-parts and makes technical field. A portable reamer with an interchangeable cutting edge comprises a clamping handle, a reamer assembly and a locking assembly. Cutter grooves are distributed on the circumference of one end of the cutter frame, and the cutter head is clamped in the cutter grooves; one end of the column body is inserted in the tool rest in a sliding mode, the pressing piece is connected with the tool rest, and one end of the column body is connected with the pressing piece. According to portable interchangeable cutting edge reamer of this application embodiment, compress tightly fixedly the cylinder through compressing tightly the piece, the realization is to the locking of whole device, when needs are changed the tool bit, the unblock compresses tightly the piece, the cylinder that slides simultaneously keeps away from the sword groove, make the tool bit can follow the sword inslot and separate out, the tool bit of being convenient for to change different specifications is used for the processing to the hole, and when carrying, only need join in marriage the tool bit of taking required specification, reduce the total amount and the volume of instrument, portable uses, moreover, the steam generator is simple in structure, installation procedures is few, and the suitability is strong.

Description

Portable reamer with replaceable cutting edge

Technical Field

The application relates to the technical field of auto-parts manufacturing, particularly to a portable reamer with an interchangeable cutting edge.

Background

At present, a reamer is a rotary cutter with one or more cutter teeth for cutting off a thin layer of metal on the surface of a processed hole, the reamer is a rotary finish machining cutter with a straight edge or a spiral edge and used for reaming or repairing the hole, the machining precision requirement of the reamer is usually higher than that of a drill bit due to less cutting amount, and the reamer can be manually operated or installed on a drill machine for working;

current reamer is mostly a body structure, is not convenient for change the blade, needs different reamers to the hole of different grade type size, uses the trouble, has increased the burden of carrying, is not convenient for carry.

Disclosure of Invention

The present application is directed to solving at least one of the problems in the prior art. For this reason, this application provides a portable interchangeable cutting edge reamer, and the tool bit of being convenient for change different specifications is used for the processing to the hole to when carrying, only need to join in marriage the tool bit of taking required specification, reduce the total amount and the volume of instrument, portable uses, and simple structure, installation procedure are few, and the suitability is strong.

According to this application embodiment portable interchangeable cutting edge reamer is including centre gripping handle, reamer subassembly and locking Assembly.

The reamer component comprises a cutter rest and a cutter head, wherein cutter grooves are distributed on the circumference of one end of the cutter rest, and the cutter head is clamped in the cutter grooves;

the locking assembly comprises a pressing part and a cylinder, one end of the cylinder is inserted in the tool rest in a sliding mode, the pressing part is connected with the tool rest, and one end of the cylinder is connected with the pressing part.

According to the portable interchangeable cutting edge reamer of this application embodiment, knife rest one end circumference distributes has the sword groove, the one end of cylinder slides and pegs graft in the knife rest, the tool bit joint is in the sword groove, the cylinder is contradicted fixedly the tool bit of joint in the sword groove, the tool bit of being convenient for is fixed with the knife rest, prevent to rock in the use, the chucking spare is connected with the knife rest, the one end of cylinder with compress tightly the piece and be connected, compress tightly fixedly the cylinder through compressing tightly the piece, realize the locking to whole device, when needs change the tool bit, the unblock compresses tightly the piece, the sword groove is kept away from to the cylinder that slides simultaneously, make the tool bit can follow the sword inslot and separate out, the tool bit of being convenient for to change different specifications is used for the processing to the hole, and when carrying, only need join in marriage the tool bit of taking required specification, reduce the total amount and the volume of instrument, portable uses, moreover, the steam generator is simple structure, installation procedures are few, and high applicability.

In addition, the portable reamer with the replaceable cutting edge according to the embodiment of the application has the following additional technical characteristics:

in some embodiments of the present application, the clamping handle is a morse taper handle, and a through hole is formed on a surface of the clamping handle.

In some embodiments of the present application, the tool holder is a cylindrical structure, the tool grooves are formed in a circumferential surface of the cylindrical structure, and the tool groove array is provided with five tool grooves.

In some embodiments of the present application, the tool holder inner surface is configured as a conical surface and the cylinder outer surface is configured as a conical surface, the cylinder outer surface mating with the tool holder inner surface.

In some embodiments of the present application, the tool bit includes a cutting edge and a limiting block, the limiting block is clamped in the tool groove, and the cutting edge penetrates through the tool groove and extends to the outer surface of the tool holder.

In some embodiments of the application, the pressing member includes a support, a connecting rod and a pull rod, the support is fixedly connected to the tool rest, one end of the support is slidably inserted with the sliding rod, one end of the sliding rod is connected to the cylinder, the other end of the sliding rod is hinged to the connecting rod, the other end of the connecting rod is hinged to the pull rod, and one end of the pull rod is hinged to the support.

In some embodiments of this application, the support with the knife rest passes through bolt fixed connection, the support is cylindric, and has seted up the holding tank along this cylindric length direction, the holding tank internal fixation has articulated seat, the one end of pull rod is passed through articulated seat with leg joint, the one end that articulated seat was kept away from to the holding tank is fixed with the sliding sleeve, the slide bar slides and pegs graft in the sliding sleeve.

In some embodiments of the present application, one end of the sliding rod is fixedly connected to the cylinder through a bolt, and a rubber block is disposed between an end of the sliding rod and an end surface of the cylinder.

In some embodiments of the present application, the pull rod is a lever bent at a certain angle, and one end of the connecting rod is hinged to the bent portion of the pull rod.

In some embodiments of the present application, a sleeve is slidably sleeved on an outer surface of the bracket, and an inner wall of the sleeve abuts against one end of the pull rod.

In some embodiments of the present application, the tool holder surface is provided with a spiral discharge groove, and the spiral discharge groove is disposed at an end away from the tool groove.

In some embodiments of this application, the cylinder cavity is provided with the stock solution chamber, go out the liquid hole has been seted up to cylinder one end lateral wall, the stock solution chamber with go out liquid hole intercommunication.

In some embodiments of this application, the slide opening has been seted up on the support surface, it has the round pin post to slide to peg graft in the slide opening, the one end of round pin post is fixed with the locating lever, the constant head tank has been seted up to the sleeve inner wall, locating lever cooperation joint is in the constant head tank, the device receives rotatory centrifugal action in the use, and the locating lever joint that is realizes the telescopic locking in the constant head tank, avoids the sleeve to drop in the use for the pull rod is inefficacy to the locking of slide bar.

In some embodiments of the present application, the slide hole is a prismatic hole, and the pin is a prismatic column matched with the prismatic hole for limiting the radial rotation of the pin;

the clamping handle is fixedly connected with the sleeve, a limiting protrusion is fixed on the outer wall of the tool rest, a limiting groove is fixed on the inner wall of the sleeve, and the limiting protrusion is matched with the limiting groove and used for limiting the sleeve to rotate radially relative to the tool rest.

In some embodiments of this application, the constant head tank bottom is fixed with magnet, the locating lever is the magnetism body of rod, the constant head tank bottom runs through to be provided with and runs through logical groove, sets up magnet and locating lever actuation, improves the stability of joint, sets up simultaneously to run through logical groove and is used for stabbing the locating lever from the outside with shaft-like structure and resets, is convenient for remove and dismantles the sleeve.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

FIG. 1 is a schematic structural view of a portable replaceable cutting edge reamer according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a front view according to an embodiment of the present application;

FIG. 3 is a schematic view of a structure taken from a first perspective according to an embodiment of the present application;

FIG. 4 is a schematic perspective view of a pin according to an embodiment of the present application;

FIG. 5 is a perspective view of a tool tip according to an embodiment of the present application;

FIG. 6 is a schematic view of a structure taken from a second perspective according to an embodiment of the present application;

FIG. 7 is a schematic view of a sleeve coupled to a clamping shank according to an embodiment of the present application;

FIG. 8 is a schematic view of a tool holder coupled to a support according to an embodiment of the present application;

FIG. 9 is a perspective view of a sleeve coupled to a clamping shank according to an embodiment of the present application;

FIG. 10 is a perspective view of a tool holder coupled to a bracket according to an embodiment of the present application;

FIG. 11 is a perspective view of a compression member according to an embodiment of the present application;

fig. 12 is a schematic diagram of the structure at a in fig. 6 according to an embodiment of the present application.

Icon: 100. a clamping handle; 101. a through hole; 110. a pin; 130. positioning a rod; 300. a reamer assembly; 310. a tool holder; 311. a cutter groove; 313. a spiral discharge chute; 315. a limiting protrusion; 330. a cutter head; 500. a locking assembly; 510. a compression member; 511. a support; 513. a connecting rod; 515. a pull rod; 517. a slide bar; 519. a hinged seat; 530. a cylinder; 531. a liquid storage cavity; 533. a liquid outlet hole; 550. a sleeve; 551. positioning a groove; 553. a magnet; 555. and a limiting groove.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus should not be considered limiting.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Examples

A portable replaceable cutting edge reamer according to an embodiment of the present application is described below with reference to the accompanying drawings;

as shown in fig. 1-12, a portable interchangeable cutting edge reamer according to embodiments of the present application includes a holder handle 100, a reamer assembly 300, and a locking assembly 500.

As shown in fig. 1-5, the reamer assembly 300 includes a holder 310 and a cutter head 330, wherein a cutter slot 311 is circumferentially distributed at one end of the holder 310, and the cutter head 330 is clamped in the cutter slot 311;

when the reamer is normally machined, the cutting edge is abraded, so that the size of the cutter is reduced, the cutter cannot be used any more, if the whole reamer is scrapped, the cutter can be greatly wasted, the cutter head 330 can be replaced, when the reamer is abraded, only the cutter head 330 with the cutting edge needs to be replaced, and the cutter body can be continuously used, so that the cost is saved;

the common reamer is usually in a multi-blade form, the blade height difference can occur during high-speed rotation, the precision of a machined hole can be influenced by ultra-precision machining of a small hole, the high-precision single-blade reamer replaces the multi-blade reamer by assembling the cutter head 330, the problem of the blade height difference during high-speed rotation is solved, and the precision of the machined hole is greatly improved;

as shown in fig. 6-10, the locking assembly 500 includes a pressing member 510 and a cylinder 530, one end of the cylinder 530 is slidably inserted into the tool holder 310, the pressing member 510 is connected to the tool holder 310, and one end of the cylinder 530 is connected to the pressing member 510.

According to the portable reamer with the replaceable cutting edge, the cutter grooves 311 are distributed on the circumference of one end of the cutter holder 310, one end of the column 530 is inserted into the cutter holder 310 in a sliding mode, the cutter head 330 is clamped in the cutter grooves 311, the column 530 supports and fixes the cutter head 330 clamped in the cutter grooves 311, the cutter head 330 and the cutter holder 310 are convenient to fix, and shaking in the using process is prevented; compressing tightly piece 510 and knife rest 310 and being connected, the one end of cylinder 530 is connected with compressing tightly piece 510, compress tightly fixedly through compressing tightly piece 510 to cylinder 530, the realization is to the locking of whole device, when tool bit 330 needs to be changed, the unblock compresses tightly piece 510, cylinder 530 keeps away from sword groove 311 slides simultaneously, make tool bit 330 can follow and separate out in sword groove 311, be convenient for change the processing that tool bit 330 of different specifications is used for the hole, and when carrying, only need join in marriage the tool bit 330 of taking required specification, reduce the total amount and the volume of instrument, portable use, moreover, the steam generator is simple in structure, installation procedures are few, and the suitability is strong.

according to some embodiments of the present application, as shown in fig. 1, the clamping handle 100 is a morse taper handle, which is an international standard for taper, and is used for interference fit for precise positioning, and since the taper is small, a certain torque can be transmitted by using the principle of friction, and the taper fit is adopted, the disassembly is convenient; and the surface of the clamping handle 100 is provided with a through hole 101, which is convenient for manual operation by matching with a hand-held tool.

As shown in fig. 1, in some specific embodiments of the present application, the tool holder 310 is a cylindrical structure, the tool grooves 311 are formed on the circumferential surface of the cylindrical structure, five tool grooves 311 are arranged in an array, and a plurality of tool grooves 311 are arranged on the circumference, which can be arranged according to specific use requirements, so as to facilitate use in practical processing production.

As shown in fig. 3, specifically, the inner surface of the tool holder 310 is a tapered surface, the outer surface of the cylinder 530 is a tapered surface, and the outer surface of the cylinder 530 matches with the inner surface of the tool holder 310, so that the outer surface of the cylinder 530 fits with the inner surface of the tool holder 310, thereby facilitating the replacement of the tool holder 330, and preventing the tool holder from loosening during use.

As shown in fig. 5, it should be noted that the cutter head 330 includes a cutter edge and a limiting block, the limiting block is clamped in the cutter slot 311, and the cutter edge penetrates through the cutter slot 311 and extends to the outer surface of the cutter holder 310.

According to some embodiments of the present application, as shown in fig. 6, the pressing member 510 includes a support 511, a connecting rod 513 and a pull rod 515, the support 511 is fixedly connected to the tool post 310, one end of the support 511 is slidably inserted with a sliding rod 517, one end of the sliding rod 517 is connected to the cylinder 530, the other end of the sliding rod 517 is hinged to the connecting rod 513, the other end of the connecting rod 513 is hinged to the pull rod 515, and one end of the pull rod 515 is hinged to the support 511; one end of the pull rod 515 is hinged with the bracket 511, one end of the connecting rod 513 is hinged with the pull rod 515, and one end of the pull rod 515 is pulled to rotate around the bracket 511, so that the connecting rod 513 is pulled to contract, or the other end of the pull rod 515 pushes the connecting rod 513 to generate displacement for resetting.

Further, support 511 and knife rest 310 pass through bolt fixed connection, and support 511 is cylindric, and has seted up the holding tank along this cylindric length direction, is fixed with articulated seat 519 in the holding tank, and the one end of pull rod 515 is connected with support 511 through articulated seat 519, and the one end that the holding tank kept away from articulated seat 519 is fixed with the sliding sleeve, and slide bar 517 slides and pegs graft in the sliding sleeve.

Specifically, bolt and cylinder 530 fixed connection are passed through to the one end of slide bar 517, are provided with the block rubber between the tip of slide bar 517 and the cylinder 530 terminal surface, and the bolted connection who sets up is fixed, and the dismantlement in the later stage of being convenient for is maintained, and the block rubber of setting plays the cushioning effect and utilizes the elasticity extrusion, improves and compresses tightly the effect.

In some embodiments of the present application, as shown in fig. 11, the pull rod 515 is a lever bent at a certain angle, and one end of the connecting rod 513 is hinged to the bent portion of the pull rod 515.

In some embodiments of the present application, the outer surface of the bracket 511 is slidably sleeved with a sleeve 550, the inner wall of the sleeve 550 abuts against one end of the pull rod 515, and the pull rod 515 is bent to facilitate pulling or pushing operations, so as to facilitate abutting and pressing operations of the sleeve 550.

According to some embodiments of the present application, as shown in fig. 6, the surface of the tool holder 310 is provided with a spiral discharge groove 313, and the spiral discharge groove 313 is arranged at one end far away from the tool groove 311; the spiral chip groove is adopted, so that scrap iron can be broken off during processing, processing is convenient, and difficult-to-process materials such as stainless steel, titanium alloy and the like can be processed more conveniently; the application range is wider, and the processing efficiency is higher.

In some embodiments, the cylinder 530 has a hollow liquid storage cavity 531, a liquid outlet 533 is formed on a side wall of one end of the cylinder 530, and the liquid storage cavity 531 is communicated with the liquid outlet 533.

The working process according to the embodiments of the present application is described below with reference to the accompanying drawings:

in the reamer processing process, the surface of the tool rest 310 is provided with a spiral discharge groove 313, so that scrap iron can be broken off in processing and can be pushed to be discharged, accumulation and blockage are reduced, and the processing is convenient; the cylinder 530 is hollow and provided with a liquid storage cavity 531 for filling cutting liquid or lubricant, a liquid outlet hole 533 is formed in the side wall of one end of the cylinder 530, the liquid storage cavity 531 is communicated with the liquid outlet hole 533, when the cylinder 530 rotates, liquid is sprayed out through the liquid outlet hole 533 under the action of centrifugal force, the liquid is used for spraying the surface needing to be cut, and hole processing is facilitated.

It can be understood, the slide opening has been seted up on the support 511 surface, it has round pin post 110 to slide the grafting in the slide opening, the one end of round pin post 110 is fixed with locating lever 130, constant head tank 551 has been seted up to sleeve 550 inner wall, locating lever 130 cooperation joint is in constant head tank 551, the device receives rotatory centrifugal action in the use, locating lever 130 joint be in constant head tank 551, the realization is to the locking of sleeve 550, avoid in the use sleeve 550 to drop, make pull rod 515 inefficacy to the locking of slide bar 517.

According to some embodiments of the present application, as shown in fig. 12, the slide hole is a prismatic hole, and the pin 110 is a prismatic post matching with the prismatic hole for limiting the radial rotation of the pin 110;

the clamping handle 100 is fixedly connected with the sleeve 550, the outer wall of the tool holder 310 is fixedly provided with a limiting protrusion 315, the inner wall of the sleeve 550 is fixedly provided with a limiting groove 555, and the limiting protrusion 315 is matched with the limiting groove 555 and used for limiting the radial rotation of the sleeve 550 relative to the tool holder 310.

In some embodiments of the present application, a magnet 553 is fixed at the bottom of the positioning groove 551, the positioning rod 130 is a magnetic rod, a through groove is provided at the bottom of the positioning groove 551, the magnet 553 is attracted to the positioning rod 130 to improve the stability of the joint, and the through groove is provided to poke the positioning rod 130 to reset by a rod-shaped structure from the outside, so as to facilitate the detachment of the detachment sleeve 550.

the device is under the centrifugal action of rotation in the use process, the positioning rod 130 is clamped in the positioning groove 551 to lock the sleeve 550, the sleeve 550 is prevented from falling off in the use process, the locking of the pull rod 515 to the sliding rod 517 is disabled, the inner wall of the sleeve 550 is fixedly provided with the limiting groove 555, the limiting protrusion 315 is matched with the limiting groove 555 to limit the sleeve 550 to radially rotate relative to the knife rest 310, the magnet 553 is arranged to attract the positioning rod 130, the clamping stability is improved, meanwhile, the through groove is formed to poke the positioning rod 130 to reset by utilizing a rod-shaped structure from the outside, the sleeve 550 is convenient to remove and disassemble, and the disassembly and the assembly are convenient;

in some embodiments of the present application, the pin 110, the tool holder 310, the bracket 511, the connecting rod 513, the pull rod 515, the sliding rod 517, and the sleeve 550 are stainless steel or aluminum alloy pieces, and thus are more robust.

Wherein the clamping handle 100 may be configured as a hollow member and the cylinder 530 may be an aluminum alloy member.

Other constructions and operations of the cutter head 330 according to embodiments of the present application are known to those of ordinary skill in the art and will not be described in detail herein.

It should be noted that the specific model specification of the tool bit 330 needs to be determined by model selection according to the actual specification of the device, and the specific model selection calculation method adopts the prior art in the field, so detailed description is omitted.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The above-described apparatus embodiments are merely illustrative.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A portable reamer with changeable cutting edge is characterized by comprising

A grip handle (100);

the reamer assembly (300) comprises a cutter holder (310) and a cutter head (330), wherein cutter grooves (311) are distributed on the circumference of one end of the cutter holder (310), and the cutter head (330) is clamped in the cutter grooves (311);

the locking assembly (500) comprises a pressing piece (510) and a cylinder (530), one end of the cylinder (530) is inserted into the tool holder (310) in a sliding mode, the pressing piece (510) is connected with the tool holder (310), and one end of the cylinder (530) is connected with the pressing piece (510).

2. The reamer with the replaceable cutting edge as claimed in claim 1, wherein the clamping handle (100) is a Morse taper handle, and a through hole (101) is formed on the surface of the clamping handle (100).

3. The portable reamer with replaceable cutting edge as claimed in claim 1, wherein the holder (310) is a cylindrical structure, the cutting grooves (311) are opened on the circumferential surface of the cylindrical structure, and the array of the cutting grooves (311) is provided with five.

4. The portable reamer with replaceable cutting edge of claim 3, wherein the inner surface of the holder (310) is configured as a conical surface, the outer surface of the cylinder (530) is configured as a conical surface, and the outer surface of the cylinder (530) is matched with the inner surface of the holder (310).

5. The reamer with the replaceable cutting edge as claimed in claim 1, wherein the cutter head (330) comprises a cutting edge and a limiting block, the limiting block is clamped in the cutter groove (311), and the cutting edge extends to the outer surface of the cutter holder (310) through the cutter groove (311).

6. The reamer with the replaceable cutting edge as claimed in claim 1, wherein the pressing piece (510) comprises a support (511), a connecting rod (513) and a pull rod (515), the support (511) is fixedly connected with the tool holder (310), a sliding rod (517) is inserted into one end of the support (511) in a sliding mode, one end of the sliding rod (517) is connected with the cylinder (530), the other end of the sliding rod (517) is hinged with the connecting rod (513), the other end of the connecting rod (513) is hinged with the pull rod (515), and one end of the pull rod (515) is hinged with the support (511).

7. The reamer with the replaceable cutting edge as claimed in claim 6, wherein the support (511) is fixedly connected with the cutter holder (310) through a bolt, the support (511) is cylindrical, a containing groove is formed in the length direction of the cylindrical support, a hinge seat (519) is fixed in the containing groove, one end of the pull rod (515) is connected with the support (511) through the hinge seat (519), a sliding sleeve is fixed at one end, away from the hinge seat (519), of the containing groove, and the sliding rod (517) is inserted in the sliding sleeve in a sliding mode.

8. The reamer with the replaceable cutting edge as claimed in claim 7, wherein one end of the sliding rod (517) is fixedly connected with the cylinder (530) through a bolt, and a rubber block is arranged between the end of the sliding rod (517) and the end face of the cylinder (530).

9. The reamer with the replaceable cutting edge as claimed in claim 6, wherein the pull rod (515) is a lever bent at a certain angle, and one end of the connecting rod (513) is hinged with the bent part of the pull rod (515).

10. The portable reamer with replaceable cutting edge of claim 9, wherein the outer surface of the bracket (511) is slidably sleeved with a sleeve (550), and the inner wall of the sleeve (550) is abutted against one end of the pull rod (515).