Reamer with replaceable reamer insert

Abstract

The utility model relates to the technical field of reamer, concretely is a reamer convenient to replace reamer piece, including the reamer bar subassembly, connecting column and reamer head, the reamer bar subassembly and connecting column are fixedly connected through T type connecting mechanism, the reamer head includes first reamer head and second reamer head, the diameter of first reamer head is less than phi 35mm, the diameter of second reamer head is greater than phi 35mm, and the reamer head is detachably connected between fastening assembly and connecting column, and fastening assembly includes first locking screw and second locking screw, first locking screw is used for locking and fixing between first reamer head and connecting column, and second locking screw is used for locking and fixing between second reamer head and connecting column, through the modularization design of reamer bar subassembly, connecting column and reamer head, the quick replacement of reamer head has been realized, when cutting portion wears, only needs to replace low -cost reamer head, and reamer bar subassembly and connecting column are used as durable parts and can be long -term repeatedly used to greatly reduce the long -term use cost of user.

Description

Technical Field

[0001] This utility model relates to the field of reamer technology, specifically to a reamer with easily replaceable reamer blades. Background Technology

[0002] A reamer is a rotary cutting tool used for finishing and semi-finishing holes. It performs micro-cutting on the inner wall of a pre-machined hole through the cutting teeth on its side edge to achieve high dimensional accuracy, shape accuracy and surface finish. In precision manufacturing fields such as automobiles, aerospace, and mold manufacturing, extremely high requirements are placed on the accuracy, efficiency and economy of reaming.

[0003] Currently, most high-precision reamers on the market adopt an integral structure, meaning the shank and the cutting head are integrally formed or connected by a non-removable permanent connection. While this structure can guarantee a certain level of system rigidity and initial accuracy, it has the following significant drawbacks: Firstly, when the cutting part of the reamer wears to the end of its lifespan, even if the shank remains intact, the entire tool must be scrapped. High-performance tool materials such as carbide and cermet are expensive, and scrapping the entire tool results in a huge waste of resources and increased operating costs, especially for large-diameter reamers, where the cost issue is particularly prominent. Secondly, each integral reamer can typically only machine a hole of a specific size. To meet the machining needs of different hole diameters in production, users must equip themselves with a large number of reamers of different specifications. This not only increases the initial procurement cost but also brings enormous pressure to tool management and inventory.

[0004] In addition, for machining special hole diameters of non-standard sizes, custom integral reamers are required. The customization process, from material feeding and machining to heat treatment and grinding, takes several weeks or even longer, making it impossible to quickly respond to urgent needs on the production site, thus affecting production efficiency and delivery cycle. Utility Model Content

[0005] Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a reamer with easily replaceable reamer blades. It can ensure extremely high connection rigidity, enable quick and easy replacement of the reamer head, and also has high versatility and low operating costs. Technical solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a reamer with easily replaceable reamer blades, comprising a shank assembly, a connecting post, and a reamer head. The shank assembly and the connecting post are fixedly connected by a T-shaped connecting mechanism. The reamer head includes a first reamer head and a second reamer head. The diameter of the first reamer head is less than Φ35mm, and the diameter of the second reamer head is greater than Φ35mm. The reamer head is detachably connected to the connecting post through a fastening assembly. The fastening assembly includes a first locking screw and a second locking screw. The first locking screw is used to lock and fix the first reamer head to the connecting post, and the second locking screw is used to lock and fix the second reamer head to the connecting post.

[0008] Preferably, the tool holder assembly includes a tool holder body and a tool shank. The tool holder assembly is made of cemented carbide, and the tool shank is fixedly connected to the end of the tool holder body away from the connecting post. The tool shank is used to connect to the machine tool spindle.

[0009] Preferably, the T-shaped connecting mechanism includes a T-shaped boss and a T-shaped groove that matches the T-shaped boss. The T-shaped boss is fixedly connected to the end of the tool holder body away from the tool shank, and the T-shaped groove is opened at one end of the connecting post. The T-shaped boss and the T-shaped groove are fixedly welded together by a brazing layer.

[0010] Preferably, the connecting column is made of 65Mn spring steel, and the elastic deformation of the connecting column is between 0.1-0.3mm. A positioning outer cone surface is fixedly connected to the middle of the other end of the connecting column. The positioning outer cone surface is a 1:10 double-sided positioning hollow short cone. A transmission pin is fixedly connected to both sides of the positioning outer cone surface at the other end of the connecting column. The transmission pin is a cylindrical pin, and the transmission pins on both sides are symmetrically distributed.

[0011] Preferably, the other end of the connecting column is provided with a first threaded hole adapted to the first locking screw and a second threaded hole adapted to the second locking screw. The first threaded hole is located in the middle of the positioning outer cone surface, and four second threaded holes are provided, which are distributed along the outer circumference of the positioning outer cone surface.

[0012] Preferably, the reamer head is made of metal ceramic or cemented carbide. A positioning inner cone hole adapted to the positioning outer cone surface is opened in the middle of one side of the first reamer head. The positioning inner cone hole is a 1:10 double-sided positioning inner cone. A transmission groove adapted to the transmission pin is opened on both sides of the positioning inner cone hole on one side of the first reamer head.

[0013] Preferably, in the unlocked state, there is an axial gap of 0.01mm to 0.015mm between the positioning outer conical surface and the positioning inner conical hole, and several cutting edges are fixedly connected to the outer surface of the reamer head. The cutting edges are made of polycrystalline diamond and have an unequal tooth structure.

[0014] Preferably, a first screw countersunk hole is formed in the middle of the end face of the first reamer head, a first through hole is formed in the middle of the first screw countersunk hole, a first locking screw passes through the first through hole and is threadedly connected to the first threaded hole, and the head of the first locking screw is recessed into the interior of the first screw countersunk hole.

[0015] Preferably, a positioning inner conical hole adapted to the positioning outer conical surface is provided in the middle of one side of the second reamer head, and a transmission groove adapted to the transmission pin is provided on both sides of the positioning inner conical hole on one side of the second reamer head. A second screw countersunk hole corresponding to the second threaded hole is provided on the end face of the second reamer head, and a second through hole is provided in the middle of the second screw countersunk hole.

[0016] Preferably, the second locking screw passes through the threaded connection between the second through hole and the second threaded hole, and the head of the second locking screw is recessed into the interior of the second screw countersunk hole. The heads of both the first locking screw and the second locking screw are provided with internal hexagonal grooves. The fastening assembly also includes washers, which are respectively fitted on the surfaces of the first locking screw and the second locking screw, and the washers are in close contact with the reamer head and the locking screw.

[0017] Compared with the prior art, the beneficial effects of this utility model are: 1. Through the modular design of the tool holder assembly, connecting post, and reamer head, the reamer head can be quickly replaced. When the cutting part wears out, only a low-cost reamer head needs to be replaced. The tool holder assembly and connecting post are durable parts that can be reused for a long time. This avoids the problem of traditional integral reamers being scrapped due to local wear. Especially for tools made of expensive materials such as carbide and cermet, the cost-saving effect is more significant, greatly reducing the user's long-term operating costs. 2. A standard tool holder assembly and connecting post can be equipped with a series of reamer heads of different diameters, numbers of teeth, and materials. This "one tool holder with multiple heads" configuration means that users do not need to equip a complete reamer for each hole diameter specification, which greatly reduces the number and types of tools required for inventory, simplifies tool management, and enables a quick response to the processing needs of different hole diameters, thereby improving production flexibility. 3. The connecting column and the reamer head are fitted with a positioning outer conical surface and a positioning inner conical hole, and symmetrically distributed transmission pins and transmission grooves are provided on both sides. The conical surface fit provides extremely high centering accuracy and repeatability, while the transmission pin and transmission groove structure can effectively transmit cutting torque. The small axial clearance reserved before locking ensures that under the action of the locking screw, the elastic deformation of the connecting column material can make the conical surface fit tightly, eliminating the fit clearance and forming a connection with good rigidity and high precision, thereby ensuring the quality of the reaming hole. 4. The reamer head replacement operation is simple and quick. For the small-diameter first reamer head, only one first locking screw needs to be turned. For the large-diameter second reamer head, only four second locking screws need to be tightened evenly. Operators can complete the tool change in a few minutes using a standard Allen wrench, which significantly reduces machine tool downtime. It is especially suitable for flexible production lines with multiple varieties and small batches. It can quickly respond to emergency processing tasks for non-standard hole diameters and effectively improve overall production efficiency. In addition, manufacturers can pre-produce standard interface reamer head semi-finished products. When receiving non-standard size orders, only the outer circle and cutting edge of the semi-finished reamer head need to be finely ground for final delivery, shortening the production cycle from several weeks to several days. 5. The tool holder assembly and the connecting column are connected by a T-shaped connection mechanism and supplemented by brazing, resulting in a firm and rigid connection. The connecting column is made of 65Mn spring steel, which has appropriate elasticity and facilitates tapered locking. The cutting edge is made of polycrystalline diamond and designed with an unequal tooth structure, which effectively suppresses vibration during machining and helps to obtain a higher surface finish. The use of countersunk locking screws and washers makes the structure compact, prevents interference, and ensures the reliability of locking. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the first reamer head connection of this utility model.

[0019] Figure 2 This is a schematic diagram of the overall cross-sectional structure of this utility model.

[0020] Figure 3 This is a schematic diagram of the tool holder assembly structure of this utility model.

[0021] Figure 4 This is a first-view structural diagram of the connecting column of this utility model.

[0022] Figure 5 This is a schematic diagram of the connecting column structure from a second perspective of the present invention.

[0023] Figure 6 This is a schematic diagram of the first reamer head connection surface structure of this utility model.

[0024] Figure 7 This is a schematic diagram of the end face structure of the first reamer head of this utility model.

[0025] Figure 8 This is a schematic diagram of the overall structure of the second reamer head connection of this utility model.

[0026] Figure 9 This is a schematic diagram of the connecting surface structure of the second reamer head of this utility model.

[0027] Figure 10This is a schematic diagram of the end face structure of the second reamer head of this utility model.

[0028] In the diagram: 1. Tool holder assembly; 101. Tool holder body; 102. Tool shank; 2. Connecting post; 201. Positioning outer conical surface; 202. Transmission pin; 203. First threaded hole; 204. Second threaded hole; 3. T-shaped connecting mechanism; 301. T-shaped boss; 302. T-shaped groove; 303. Brazing layer; 4. First reamer head; 401. Positioning inner conical hole; 402. Transmission groove; 403. First screw countersunk hole; 404. First through hole; 405. Cutting edge; 5. Fastening assembly; 501. First locking screw; 502. Second locking screw; 503. Socket hexagonal groove; 504. Washer; 6. Second reamer head; 601. Second screw countersunk hole; 602. Second through hole. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0030] Please see Figures 1 to 10 This is the first embodiment of the present invention, providing a technical solution: a reamer with easily replaceable reamer blades, comprising a shank assembly 1, a connecting post 2, and a reamer head. The shank assembly 1 and the connecting post 2 are fixedly connected by a T-shaped connecting mechanism 3. The reamer head includes a first reamer head 4 and a second reamer head 6. The diameter of the first reamer head 4 is less than Φ35mm, and the diameter of the second reamer head 6 is greater than Φ35mm. The reamer head is detachably connected to the connecting post 2 by a fastening assembly 5. The fastening assembly 5 includes a first locking screw 501 and a second locking screw 502. The first locking screw 501 is used to lock and fix the first reamer head 4 to the connecting post 2, and the second locking screw 502 is used to lock and fix the second reamer head 6 to the connecting post 2.

[0031] During use, the modular design of the tool holder assembly 1, connecting post 2, and reamer head enables quick replacement of the reamer head. When the cutting part wears out, only a low-cost reamer head needs to be replaced. The tool holder assembly 1 and connecting post 2 are durable parts that can be reused for a long time, thus avoiding the problem of traditional integral reamers being scrapped due to local wear. This is especially true for tools made of expensive materials such as carbide and cermet, where the cost savings are even more significant, greatly reducing the long-term operating costs for users. A standard tool holder assembly 1 and connecting post 2 can be equipped with a series of reamer heads of different diameters, numbers of teeth, and materials. This "one tool holder with multiple heads" configuration means that users do not need to equip a complete reamer for each hole diameter specification, which greatly reduces the number and types of tools required for inventory, simplifies tool management, and enables rapid response to the machining needs of different hole diameters, thereby improving production flexibility. Example

[0032] Please see Figures 3 to 7 This is the second embodiment of the present invention, which differs from the first embodiment in that: The tool holder assembly 1 includes a tool holder body 101 and a tool holder 102. The tool holder assembly 1 is made of cemented carbide. The tool holder 102 is fixedly connected to the end of the tool holder body 101 away from the connecting post 2. The tool holder 102 is used to connect to the machine tool spindle. The T-shaped connecting mechanism 3 includes a T-shaped boss 301 and a T-shaped groove 302 that matches the T-shaped boss 301. The T-shaped boss 301 is fixedly connected to the end of the tool holder body 101 away from the tool holder 102. The T-shaped groove 302 is opened at one end of the connecting post 2. The T-shaped boss 301 and the T-shaped groove 302 are fixedly welded together by a brazing layer 303.

[0033] The connecting column 2 is made of 65Mn spring steel. The elastic deformation of the connecting column 2 is between 0.1 and 0.3 mm. The middle of the other end of the connecting column 2 is fixedly connected to a positioning outer cone surface 201. The positioning outer cone surface 201 is a 1:10 double-sided positioning hollow short cone. The other end of the connecting column 2 is fixedly connected to both sides of the positioning outer cone surface 201 with transmission pins 202. The transmission pins 202 are cylindrical pins and are symmetrically distributed on both sides. The other end of the connecting column 2 is provided with a first threaded hole 203 that matches the first locking screw 501 and a second threaded hole 204 that matches the second locking screw 502. The first threaded hole 203 is located in the middle of the positioning outer cone surface 201. There are four second threaded holes 204, which are distributed along the outer circumference of the positioning outer cone surface 201.

[0034] The reamer head is made of metal ceramic or cemented carbide. A positioning inner cone hole 401, matching the positioning outer cone surface 201, is provided in the middle of one side of the first reamer head 4. The positioning inner cone hole 401 is a 1:10 double-sided positioning inner cone. On both sides of the positioning inner cone hole 401, a transmission groove 402, matching the transmission pin 202, is provided on one side of the first reamer head 4. In the unlocked state, there is an axial gap of 0.01mm to 0.015mm between the positioning outer cone surface 201 and the positioning inner cone hole 401. The outer surface of the reamer head is fixedly connected with several cutting edges 405. The cutting edges 405 are made of polycrystalline diamond and have unequal tooth structure. A first screw countersunk hole 403 is opened in the middle of the end face of the first reamer head 4. A first through hole 404 is opened in the middle of the first screw countersunk hole 403. A first locking screw 501 passes through the first through hole 404 and is threadedly connected to the first threaded hole 203. The head of the first locking screw 501 is recessed into the interior of the first screw countersunk hole 403.

[0035] During use, first, align the T-shaped boss 301 at the front end of the tool holder assembly 1 with the T-shaped groove 302 at the rear end of the connecting post 2, push the T-shaped boss 301 into the T-shaped groove 302 until it is fully fitted, and through the brazing process, form a brazing layer 303 at the joint between the T-shaped boss 301 and the T-shaped groove 302, so that the two are firmly welded together to ensure the rigidity and strength of the connection. Next, align the connecting face of the first reamer head 4 with the front end of the connecting post 2, ensuring that the two transmission pins 202 on the connecting post 2 can be precisely aligned with the two transmission grooves 402 on the first reamer head 4. At the same time, align the positioning outer cone surface 201 in the middle of the connecting post 2 with the positioning inner cone hole 401 in the middle of the first reamer head 4. Gently push the first reamer head 4 towards the connecting post 2, so that the transmission pins 202 slide into the transmission grooves 402, and the positioning outer cone surface 201 also partially enters the positioning inner cone hole 401. At this time, due to the axial gap of 0.01mm to 0.015mm, the cone surfaces are not completely tightly fitted. Then, take out a first locking screw 501 and a matching washer 504. Place the washer 504 onto the first locking screw 501. Insert the first locking screw 501 into the first countersunk hole 403 at the front end of the first reamer head 4, passing through the first through hole 404. Using a suitable-sized Allen wrench, insert it into the Allen groove 503 on the head of the first locking screw 501 and tighten it clockwise until it is screwed into the first threaded hole 203 in the middle of the connecting post 2. Continue tightening. The pulling force of the first locking screw 501 will pull the first reamer head 4 towards the connecting post 2. Since the connecting post 2 is made of 65Mn spring steel and has elasticity, it will undergo a slight elastic deformation under the pulling force, eliminating the axial gap between the positioning outer conical surface 201 and the positioning inner conical hole 401. The two achieve an interference fit and tight contact. To ensure a secure connection, the head of the first locking screw 501 should be fully recessed into the first screw countersunk hole 403, without interfering with cutting. After locking, the cutting torque is transmitted by the transmission pin 202 and the transmission groove 402. The centering accuracy is guaranteed by the tightly fitting conical surface. The connecting column 2 and the reamer head are connected by a positioning outer conical surface 201 and a positioning inner conical hole 401, and symmetrically distributed transmission pins 202 and transmission grooves 402 on both sides. The conical surface fit provides extremely high centering accuracy and repeatability. The structure of the transmission pin 202 and the transmission groove 402 can effectively transmit the cutting torque. The small axial gap reserved before locking ensures that under the action of the locking screw, the elastic deformation of the connecting column 2 material allows the conical surface to fit tightly, eliminating the fit gap and forming a connection with good rigidity and high precision, thereby ensuring the quality of the reaming.

[0036] The remaining structure is the same as that in Example 1. Example

[0037] Please see Figures 8 to 10 This is the third embodiment of the present invention, which differs from the first and second embodiments in that: The second reamer head 6 has a positioning inner cone hole 401 in the middle of one side that matches the positioning outer cone surface 201. The second reamer head 6 has a transmission groove 402 on both sides of the positioning inner cone hole 401 that matches the transmission pin 202. The end face of the second reamer head 6 has a second screw countersunk hole 601 corresponding to the second threaded hole 204. The middle of the second screw countersunk hole 601 has a second through hole 602. The second locking screw 502 passes through the second through hole 602 and is threadedly connected to the second threaded hole 204. The head of the second locking screw 502 is recessed into the second screw countersunk hole 601. The heads of the first locking screw 501 and the second locking screw 502 both have internal hexagonal grooves 503. The fastening assembly 5 also includes washers 504. The washers 504 are respectively fitted on the surfaces of the first locking screw 501 and the second locking screw 502. The washers 504 are tightly fitted with the reamer head and the locking screws.

[0038] During use, align the connecting face of the second reamer head 6 with the front end of the connecting post 2, align the transmission pin 202 and the transmission groove 402, as well as the positioning outer cone surface 201 and the positioning inner cone hole 401, and gently push it in to initially position the component, while also preserving the initial axial clearance. Then, take out four second locking screws 502 and matching washers 504. Put the washers 504 on the four second locking screws 502 respectively. Insert the four second locking screws 502 into the four second screw countersunk holes 601 at the front end of the second reamer head 6 respectively, through the corresponding second through holes 602. Using an Allen wrench, tighten the screws in a diagonal alternating and step-by-step manner, and screw the four second locking screws 502 into the four second threaded holes 204 distributed around the circumference of the connecting post 2 in sequence. This ensures that the second reamer head 6 is pulled evenly toward the connecting post 2, so that the conical surface is evenly stressed and avoids skewing. Ensure that the heads of all the second locking screws 502 are sunk into the second screw countersunk holes 601. Similarly, the tightening force causes the connecting post 2 to undergo elastic deformation, achieving a tight fit of the conical surface. When the reamer head is worn or needs to be replaced, after removing the locking screw, the elastic deformation of the connecting post 2 recovers, and the fit between the positioning outer conical surface 201 and the positioning inner conical hole 401 loosens. Then, the reamer head can be pulled out from the connecting post 2. If the fit is too tight, it can be gently shaken or tapped with a soft tool on the side wall of the reamer head to disengage it. The replacement of the reamer head is simple and quick. For the small-diameter first reamer head 4, only one first locking screw 501 needs to be tightened. For the large-diameter second reamer head 6, only four second locking screws 502 need to be tightened evenly. The operator can complete the tool replacement in a few minutes using a standard Allen wrench, which significantly reduces machine tool downtime. It is especially suitable for flexible production lines with multiple varieties and small batches, and can quickly respond to emergency processing tasks with non-standard hole diameters. This design effectively improves overall production efficiency. The tool holder assembly 1 and the connecting column 2 are connected by a T-shaped connecting mechanism 3 and brazed with a brazing layer 303, resulting in a strong and rigid connection. The connecting column 2 is made of 65Mn spring steel, which has appropriate elasticity and facilitates conical locking. The cutting edge 405 is made of polycrystalline diamond and designed with an unequal tooth structure, which effectively suppresses vibration during machining and helps to obtain a higher surface finish. The use of countersunk locking screws and washers 504 makes the structure compact, prevents interference, and ensures the reliability of locking. In addition, the manufacturer can pre-produce standard interface reamer head semi-finished products. When receiving non-standard size orders, only the outer circle of the semi-finished tool head and the cutting edge 405 need to be finely ground for quick delivery, shortening the production cycle from several weeks to several days.

[0039] The remaining structures are the same as those in Examples 1 and 2.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A reamer with easily replaceable reamer blades, comprising a shank assembly (1), a connecting post (2), and a reamer head, characterized in that: The cutter bar assembly (1) and the connecting post (2) are fixedly connected by a T-shaped connecting mechanism (3). The reamer head includes a first reamer head (4) and a second reamer head (6). The diameter of the first reamer head (4) is less than Φ35mm, and the diameter of the second reamer head (6) is greater than Φ35mm. The reamer head is detachably connected to the connecting post (2) through a fastening assembly (5). The fastening assembly (5) includes a first locking screw (501) and a second locking screw (502). The first locking screw (501) is used to lock and fix the first reamer head (4) and the connecting post (2), and the second locking screw (502) is used to lock and fix the second reamer head (6) and the connecting post (2).

2. A reamer with easily replaceable cutting blades according to claim 1, characterized in that: The tool holder assembly (1) includes a tool holder body (101) and a tool holder (102). The tool holder assembly (1) is made of cemented carbide. The tool holder (102) is fixedly connected to the end of the tool holder body (101) away from the connecting post (2). The tool holder (102) is used to connect to the machine tool spindle.

3. A reamer with easily replaceable cutting blades according to claim 2, characterized in that: The T-shaped connecting mechanism (3) includes a T-shaped boss (301) and a T-shaped groove (302) adapted to the T-shaped boss (301). The T-shaped boss (301) is fixedly connected to the end of the tool holder body (101) away from the tool handle (102). The T-shaped groove (302) is opened at one end of the connecting post (2). The T-shaped boss (301) and the T-shaped groove (302) are welded and fixed together by a brazing layer (303).

4. A reamer with easily replaceable cutting blades according to claim 3, characterized in that: The connecting column (2) is made of 65Mn spring steel. The elastic deformation of the connecting column (2) is between 0.1 and 0.3 mm. The middle of the other end of the connecting column (2) is fixedly connected to a positioning outer cone surface (201). The positioning outer cone surface (201) is a 1:10 double-sided positioning hollow short cone. The other end of the connecting column (2) is fixedly connected to both sides of the positioning outer cone surface (201) with transmission pins (202). The transmission pins (202) are cylindrical pins. The transmission pins (202) on both sides are symmetrically distributed.

5. A reamer with easily replaceable cutting blades according to claim 4, characterized in that: The other end of the connecting column (2) is provided with a first threaded hole (203) adapted to the first locking screw (501) and a second threaded hole (204) adapted to the second locking screw (502). The first threaded hole (203) is located in the middle of the positioning outer cone surface (201). There are four second threaded holes (204), and the four second threaded holes (204) are distributed along the outer circumference of the positioning outer cone surface (201).

6. A reamer with easily replaceable cutting blades according to claim 5, characterized in that: The reamer head is made of metal ceramic or hard alloy. The middle part of one side of the first reamer head (4) is provided with a positioning inner cone hole (401) that is adapted to the positioning outer cone surface (201). The positioning inner cone hole (401) is a 1:10 double-sided positioning inner cone. The first reamer head (4) is provided with a transmission groove (402) adapted to the transmission pin (202) on both sides of the positioning inner cone hole (401).

7. A reamer with easily replaceable cutting blades according to claim 6, characterized in that: In the unlocked state, there is an axial gap of 0.01mm to 0.015mm between the positioning outer conical surface (201) and the positioning inner conical hole (401). Several cutting edges (405) are fixedly connected to the outer surface of the reamer head. The cutting edges (405) are made of polycrystalline diamond and have an unequal tooth structure.

8. A reamer with easily replaceable cutting blades according to claim 7, characterized in that: The first screw countersunk hole (403) is provided in the middle of the end face of the first reamer head (4), and the first through hole (404) is provided in the middle of the first screw countersunk hole (403). The first locking screw (501) passes through the first through hole (404) and is threadedly connected to the first threaded hole (203). The head of the first locking screw (501) is sunk into the interior of the first screw countersunk hole (403).

9. A reamer with easily replaceable cutting blades according to claim 8, characterized in that: The second reamer head (6) has a positioning inner cone hole (401) adapted to the positioning outer cone surface (201) in the middle of one side. The second reamer head (6) has a transmission groove (402) adapted to the transmission pin (202) on both sides of the positioning inner cone hole (401). The end face of the second reamer head (6) has a second screw countersunk hole (601) corresponding to the second threaded hole (204). The second screw countersunk hole (601) has a second through hole (602) in the middle.

10. A reamer with easily replaceable cutting blades according to claim 9, characterized in that: The second locking screw (502) passes through the second through hole (602) and is threadedly connected to the second threaded hole (204). The head of the second locking screw (502) is recessed into the interior of the second screw countersunk hole (601). The heads of the first locking screw (501) and the second locking screw (502) are both provided with internal hexagonal grooves (503). The fastening assembly (5) also includes washers (504). The washers (504) are respectively fitted on the surfaces of the first locking screw (501) and the second locking screw (502). The washers (504) are tightly fitted with the reamer head and the locking screw.

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