High-precision PCD guide bar reamer

Abstract

The utility model discloses a high-precision PCD conducting bar reamer which comprises a reamer rod and a reamer head, the reamer head is fixed at one end of the reamer rod, the reamer rod and the reamer head are coaxially arranged, cutting edges are arranged on the edge of the reamer head, and a plurality of cutting edges are arranged along the peripheral wall of the reamer head. The PCD guide bar reamer has the advantages that the PCD guide bar module is fixed through the dovetail groove or the screw, local replacement of the PCD guide bar is achieved, the situation that a traditional integrated reamer body is integrally scrapped is avoided, the use cost is reduced, meanwhile, the maintenance process is simplified, the problem that the replacement cost is high due to the overall structure of a traditional guide bar reamer is solved, and the service life of the reamer is prolonged. By means of the micro-texture grooves in the surface of the PCD guide strip, friction resistance between the PCD guide strip and the hole wall can be reduced, the friction coefficient is greatly reduced, the chip removal fluidity is improved, the risk that the hole wall is scratched is reduced, meanwhile, the spiral cooling liquid channel is formed in the cutter bar, cooling liquid is directly sprayed to the junction of the PCD guide strip and the cutting edge through the cooling spraying holes, the heat dissipation efficiency is improved, and the service life is prolonged. And cutter body deformation caused by accumulation of cutting heat is effectively inhibited.

Description

TECHNICAL FIELD

[0001] The utility model relates to a reamer, concretely is a high-precision PCD guide bar reamer and belongs to the technical field of metal processing cutters. BACKGROUND

[0002] The reamer is a key tool in the field of hole processing, and is used for finishing the pre-drilled hole to improve the hole size precision, roundness and surface finish. With the wide application of high-hardness materials (such as quenched steel and composite materials) in the automobile and aerospace industries, the traditional hard alloy reamer is not resistant to wear due to the insufficient material, resulting in rapid tool wear, low processing efficiency and difficulty in maintaining the processing precision.

[0003] For example, in the high-efficiency PCD reamer disclosed in the publication No. CN105195828A, a layer of anticorrosive layer is coated on the cutting edge A, which can greatly improve the anticorrosive performance of the reamer, prolong the service life of the PCD reamer and improve the processing precision. However, when the traditional hard alloy reamer is used to process high-hardness or high-wear-resistance materials, the tool wears quickly and the processing precision is difficult to guarantee. The guide bar of the existing guide bar reamer is integrally formed with the cutter body, and the guide bar needs to be replaced as a whole after wearing, which is costly. In the cutting process, the chip removal is not smooth, which can easily cause the hole wall to be scratched or the tool to be stuck. The traditional hard alloy face milling cutter is easy to wear when processing high-hardness materials, has a short service life and low processing efficiency. At the same time, the existing PCD milling cutter mostly adopts a welded blade structure, which is not rigid enough and is easy to vibrate, affecting the processing surface quality. SUMMARY

[0004] The technical scheme of the utility model provides a solution significantly different from the prior art to solve the technical problem that the prior art solution is too single. Specifically, the purpose of the utility model is to solve the above-mentioned shortcomings in the prior art and provide a high-precision PCD guide bar reamer.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A high-precision PCD guide bar reamer, comprising a cutter bar and a cutter head, the cutter head is fixed at one end of the cutter bar, and the cutter bar and the cutter head are coaxially arranged, a cutting edge is arranged at the edge of the cutter head, a plurality of cutting edges are arranged along the peripheral wall of the cutter head, and a notch is arranged on the peripheral wall of the cutter head, a detachable PCD guide bar is arranged in the notch, the PCD guide bar is located between two adjacent cutting edges, and a cooling jet hole is further arranged on the peripheral wall of the cutter head, the cooling jet hole is located at the junction of the cutting edge and the PCD guide bar.

[0007] As a further scheme of the utility model, a dovetail groove is arranged on the side wall of the cutter head, the PCD guide bar is clamped in the dovetail groove, and the cutter head is detachably fixed by a screw.

[0008] As a further scheme of the utility model: the PCD guide bar surface is equipped with micro-texture groove, and the cutter head as a whole adopts high-strength alloy steel to make disc-shaped structure.

[0009] As a further scheme of the utility model: the cutter bar is coaxially fixed with butt joint disc at the end away from the cutter head, and lock holes are penetrated through the butt joint disc, the lock holes are provided with multiple and combined to form circular structure.

[0010] As a further scheme of the utility model: the cutter bar is coaxially fixed with butt joint disc at the end away from the cutter head, and lock holes are penetrated through the butt joint disc, the lock holes are provided with multiple and combined to form circular structure.

[0011] As a further scheme of the utility model: the PCD guide bar and the cutter head of hard alloy base body are combined through vacuum brazing, and the cutting edge adopts gradient PCD layer design, namely coarse particle layer + fine particle layer.

[0012] The utility model has the advantages of:

[0013] In the utility model, PCD guide bar module is fixed through dovetail groove or screw, partial replacement of PCD guide bar is realized, the traditional integral cutter body is avoided from being scrapped as a whole, use cost is reduced, maintenance process is simplified, the problem of high replacement cost of traditional guide bar reamer due to overall structure is solved, micro-texture groove on the surface of PCD guide bar can reduce friction resistance with hole wall, friction coefficient is greatly reduced, chip flowability is improved, hole wall scratch risk is reduced, the spiral cooling liquid channel built-in the cutter bar directly sprays cooling liquid to the joint of PCD guide bar and cutting edge through cooling spray hole, heat dissipation efficiency is improved, cutter body deformation caused by cutting heat accumulation is effectively inhibited, the problem of precision reduction caused by thermal deformation during high-speed cutting is solved.

[0014] Meanwhile, PCD guide bar and cutter head are combined through vacuum brazing process, the bonding strength is greater than or equal to 300MPa, the rigidity defect of welded blade is avoided, blade vibration resistance and cutting stability are improved, the problems of vibration and surface quality caused by poor rigidity of existing PCD milling cutter welded structure are solved, the cutting edge adopts gradient structure of coarse particle bottom layer + fine particle surface layer, the rigidity and sharpness are considered, tool life is prolonged by 3-5 times, the problem of rapid wear of traditional hard alloy cutting tool during high-hardness material machining is solved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 It is the schematic diagram of cutter head and connecting structure of the utility model;

[0016] Fig. 2 It is the schematic diagram of butt joint disc and overall connecting structure of the utility model;

[0017] Fig. 3 This is a partially enlarged structural schematic diagram of the present invention.

[0018] In the diagram: 1. Tool holder, 2. Tool head, 3. Cutting edge, 4. PCD guide bar, 5. Cooling nozzle, 6. Guide hole, 7. Connecting plate, 8. Locking hole. Detailed Implementation

[0019] 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 1

[0020] like Figs. 1-3 As shown, a high-precision PCD guide bar reamer includes a tool holder 1 and a tool head 2. The tool head 2 is fixed to one end of the tool holder 1, and the tool holder 1 and the tool head 2 are coaxially arranged. A cutting edge 3 is provided at the edge of the tool head 2, and multiple cutting edges 3 are provided along the peripheral wall of the tool head 2. A groove is provided on the peripheral wall of the tool head 2, and a detachable PCD guide bar 4 is provided in the groove. The PCD guide bar 4 is located between two adjacent cutting edges 3. A cooling spray hole 5 is also provided on the peripheral wall of the tool head 2, and the cooling spray hole 5 is located at the junction of the cutting edge 3 and the PCD guide bar 4. A dovetail groove is provided on the side wall of the tool head 2, and the PCD guide bar 4 is snapped into the dovetail groove and detachably fixed to the tool head 2 by screws.

[0021] The PCD guide bar 4 has micro-textured grooves on its surface, and the cutter head 2 is made of high-strength alloy steel to form a disc-shaped structure. The guide hole 6 is recessed at the axis of the end of the cutter head 2 away from the cutter head 2. The guide hole 6 integrates a spiral cooling channel and is connected to the cooling spray hole 5. The PCD guide bar 4 and the cutter head 2 of the cemented carbide substrate are bonded together by vacuum brazing, and the cutting edge 3 adopts a gradient PCD layer design, namely a coarse particle layer + a fine particle layer.

[0022] Specifically, in this embodiment, the cutter head 2 has a diameter of Φ80mm, the number of PCD guide bars 4 is 6 sets, evenly distributed circumferentially, and the length of the PCD guide bars 4 accounts for 30% of the total length of the cutter body. The coolant pressure in the cooling nozzle 5 is 0.5-2MPa, the flow rate is 10L / min, and it reaches the cutting zone directly through the spiral channel. When machining aluminum alloy, the cutting speed is 700mm / min and the feed rate is 0.05mm / r.

[0023] In this invention, the PCD guide bar 4 module is fixed by dovetail grooves or screws, enabling partial replacement of the PCD guide bar 4. This avoids the complete scrapping of the traditional one-piece tool body, reducing usage costs and simplifying the maintenance process. It also solves the problem of high replacement costs caused by the integral structure of traditional guide bar reamers. The micro-textured grooves on the surface of the PCD guide bar 4 reduce frictional resistance with the hole wall, significantly reducing the coefficient of friction, improving chip flow, and reducing the risk of hole wall scratches. At the same time, the tool holder 1 has a built-in spiral coolant channel, which directly sprays coolant into the junction of the PCD guide bar 4 and the cutting edge 3 through the cooling nozzle 5, improving heat dissipation efficiency and effectively suppressing tool body deformation caused by cutting heat accumulation. This solves the problem of decreased accuracy caused by thermal deformation during high-speed cutting.

[0024] Meanwhile, a vacuum brazing process is used to combine the PCD guide bar 4 with the cutter head 2 with a bonding strength of ≥300MPa. This avoids the insufficient rigidity of welded inserts, improves the insert's vibration resistance and cutting stability, and solves the vibration and surface quality problems caused by the poor rigidity of the existing PCD end mill welded structure. Furthermore, the cutting edge 3 adopts a gradient structure of "coarse-grained bottom layer + fine-grained surface layer", which balances chip resistance and sharpness, extending the tool life by 3-5 times and solving the problem of rapid wear when traditional carbide tools are used to process high-hardness materials. Example 2

[0025] like Figs. 1-3 As shown, in addition to all the technical features included in Embodiment 1, this embodiment also includes:

[0026] A docking plate 7 is coaxially fixed to one end of the tool holder 1 away from the tool head 2, and a locking hole 8 is provided through the docking plate 7. Multiple locking holes 8 are provided and combined to form a circular structure. When the docking plate 7 is provided, the reamer can be quickly connected and locked to external fixed equipment, such as a machine tool, and it is also convenient for disassembly and assembly operations during processing.

[0027] Working principle: When using this reamer, first connect and lock the mating disc 7 to an external fixed device, such as a machine tool, using bolts. Then, connect the external guide pipe to the guide hole 6 to start machining. During machining, the cooling and cleaning fluid is injected into the cooling spray hole 5 through the guide hole 6 and sprayed out to cool the tool body and wash away the waste chips. When it is necessary to replace the PCD guide bar 4, remove the screws to separate the PCD guide bar 4 from the tool head 2 and replace it.

[0028] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, the scope of the present application being defined by the claims appended hereto rather than by the above description, and all the changes which fall within the meaning and the scope of the equivalent elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0029] Furthermore, it should be understood that although the present specification describes exemplary embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that a person skilled in the art can understand.

Claims

1. A high-precision PCD guide bar reamer, comprising a tool holder (1) and a tool head (2), characterized in that, The cutter head (2) is fixed to one end of the cutter bar (1), and the cutter bar (1) and the cutter head (2) are coaxially arranged. A cutting edge (3) is provided at the edge of the cutter head (2). Multiple cutting edges (3) are provided along the peripheral wall of the cutter head (2), and a groove is provided on the peripheral wall of the cutter head (2). A detachable PCD guide strip (4) is provided in the groove. The PCD guide strip (4) is located between two adjacent cutting edges (3), and a cooling spray hole (5) is also provided on the peripheral wall of the cutter head (2). The cooling spray hole (5) is located at the junction of the cutting edge (3) and the PCD guide strip (4).

2. The high-precision PCD guide bar reamer according to claim 1, characterized in that: The side wall of the cutter head (2) is provided with a dovetail groove, and the PCD guide bar (4) is snapped into the dovetail groove and is fixed to the cutter head (2) in a detachable manner by screws.

3. The high-precision PCD guide bar reamer according to claim 1, characterized in that: The PCD guide bar (4) has micro-textured grooves on its surface, and the cutter head (2) is made of high-strength alloy steel to form a disc-shaped structure.

4. A high-precision PCD guide bar reamer according to claim 1, characterized in that: A guide hole (6) is recessed at the center of the shaft at one end away from the cutter head (2) on the cutter bar (1). The guide hole (6) integrates a spiral cooling channel and is connected to the cooling spray hole (5).

5. A high-precision PCD guide bar reamer according to claim 1, characterized in that: The end of the cutter bar (1) away from the cutter head (2) is also coaxially fixed with a docking plate (7), and a locking hole (8) is provided through the docking plate (7). Multiple locking holes (8) are provided and combined to form a circular structure.

6. A high-precision PCD guide bar reamer according to claim 3, characterized in that: The PCD guide bar (4) and the tool tip (2) of the cemented carbide substrate are bonded together by vacuum brazing, and the cutting edge (3) adopts a gradient PCD layer design, namely a coarse particle layer + a fine particle layer.

Images