Drilling reamer suitable for composite material

Abstract

The utility model discloses a drilling reamer suitable for composite materials, which comprises a reamer handle, a chamfering column arranged at the front end of the reamer handle, a reamer body arranged at the front end of the chamfering column, a guide cone arranged at the front end of the reamer body, a drilling tool arranged on the guide cone, second chip grooves arranged on two sides of the surface of the chamfering column, and a reamer groove arranged at the front end of the inner wall of each second chip groove. A chamfering blade is arranged on one side of the cutter groove, cutting edges are arranged on the two sides of the surface of the cutter body, a first chip guide groove is formed in the position, between the two cutting edges, of the surface of the cutter body, and an auxiliary chip guide groove is formed in the surface of each cutting edge. According to the drilling reamer suitable for the composite material, through the design of the guide cone and the cutting edge, the angle of the cutting edge is larger than that of the guide cone, when the guide cone conducts cutting in the composite material, the rear angle is gradually increased, friction force between a cutter and fibers is gradually reduced, extrusion force is also reduced accordingly, and therefore the situation that friction is large, and the cutting edge is damaged is avoided. And the cutting force is reduced.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and in particular to a drill reamer suitable for composite materials. Background Technology

[0002] A reamer is a rotating cutting tool with one or more cutting teeth used to remove a thin layer of metal from the surface of a machined hole. Reamers are rotating finishing tools with straight or helical cutting edges, used for enlarging or repairing holes. Because of their smaller cutting depth, reamers typically require higher machining precision than drills. They can be operated manually or mounted on a drilling machine. Composite materials, on the other hand, are a special type of material. They are new materials composed of two or more materials with different properties through physical or chemical methods. Suitable for applications in aerospace, automotive, and other fields, their unique bonding properties make them difficult to machine.

[0003] Currently, when reamers are used to process special composite materials, the fibers in the composite material are first subjected to transverse shearing by the reamer tip and then to downward compression by the back face. As the back face continuously compresses the fibers, the fibers are difficult to expel. Subsequently, the compressive force between the tool and the fibers increases, resulting in greater friction between the back face of the tool and the fiber surface. This leads to a reduction in the cutting force of the reamer and also makes it easy to produce surface defects such as breakage and burrs. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model provides a drill reamer suitable for composite materials. This tool reduces friction between the tool's back face and the fiber surface by adjusting the cutting edge angle, rake angle, clearance angle, and special cutting edge design, thereby achieving the technical effect of stabilizing cutting force.

[0005] To solve the above-mentioned technical problems and achieve the above-mentioned technical effects, this utility model is implemented through the following technical solution:

[0006] The technical solution of this utility model is: a drill reamer suitable for composite materials, including a shank, a chamfering post fixedly installed at the front end of the shank, a blade fixedly installed at the front end of the chamfering post, a guide cone fixedly installed at the front end of the blade, a drill bit capable of drilling holes in composite materials on the protrusion of the guide cone, a second chip removal groove formed on both sides of the surface of the chamfering post, a cutting groove formed at the front end of the inner wall of the second chip removal groove, a chamfering blade for cutting chamfers formed on one side of the cutting groove, cutting edges formed on both sides of the surface of the blade, a first chip guide groove formed on the surface of the blade and between the two cutting edges, and a chip guide groove formed on the surface of each cutting edge.

[0007] Furthermore, the surface of the blade is provided with threaded grooves, and multiple threaded grooves are provided, which are spaced apart from front to back along the length of the blade.

[0008] Furthermore, the cross-section of the cutting groove is L-shaped, and the surface of the cutting groove is smooth.

[0009] Furthermore, an angled groove is provided at the junction of the blade and the guide cone.

[0010] Furthermore, a chip removal chamfer groove is provided at the junction of the tail end of the second chip removal groove and the outer surface of the chamfered column.

[0011] Furthermore, the second chip removal groove has a spiral design and a smooth surface.

[0012] Furthermore, the first chip guide groove has a spiral design and a smooth surface.

[0013] Furthermore, the chamfering blade is made of PCD material.

[0014] Furthermore, both the blade and the guide cone are made of alloy material.

[0015] Furthermore, the tail end of the tool holder is provided with a connecting seat adapted to a CNC machining center.

[0016] The beneficial technical effects of this utility model are as follows: By designing a guide cone and a cutting edge, the angle of the cutting edge is greater than that of the guide cone. When the guide cone cuts in the composite material, as the tool continues to penetrate deeper, the cutting edge then cuts and grinds the inner wall of the hole. Because the angle of the cutting edge is greater than that of the guide cone, the clearance angle gradually increases as the tool penetrates deeper, thereby gradually reducing the friction range between the tool and the processed fiber. This leads to a gradual decrease in the frictional force between the tool and the fiber. At this time, the fiber experiences more lateral shearing from the guide cone, and the extrusion pressure is reduced accordingly. This avoids the problem of excessive friction between the tool's back face and the fiber surface, which would otherwise reduce the cutting force of the reamer. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0018] Figure 2 This is a front view schematic diagram of the structure of the first chip guide groove and the second chip discharge groove of this utility model;

[0019] Figure 3 This is another three-dimensional perspective schematic diagram of the structure of the chip guide groove and chamfering blade of this utility model;

[0020] Figure 4 This is a front view schematic diagram of the drill bit and threaded groove of this utility model.

[0021] The numbers and letters in the diagram represent the names of the corresponding components:

[0022] 1. Tool holder; 2. Chamfered post; 21. Second chip removal groove; 22. Chip removal chamfered groove; 23. Chamfered insert; 24. Tool groove; 3. Tool body; 31. First chip guide groove; 32. Guide chip groove; 33. Cutting edge; 34. Thread groove; 4. Guide cone; 41. Drill bit. Detailed Implementation

[0023] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0024] See appendix Figures 1-4 As shown, a drill reamer suitable for composite materials includes a shank 1. The tail end of the shank 1 is provided with a connecting seat adapted to a CNC machining center. A chamfering post 2 is fixedly installed at the front end of the shank 1. A blade 3 is fixedly installed at the front end of the chamfering post 2. A guide cone 4 is fixedly installed at the front end of the blade 3. An angled groove is formed at the junction of the blade 3 and the guide cone 4. A drill bit 41 capable of drilling composite materials is provided on the protrusion of the guide cone 4. Cutting edges 33 are provided on both sides of the surface of the blade 3. A first chip guide groove 31 is formed on the surface of the blade 3 between the two cutting edges 33. A chip guide groove 32 is formed on the surface of each cutting edge 33. The first chip guide groove 31 has a spiral design and a smooth surface. The blade 3 and the guide cone 4 are both made of alloy material.

[0025] By designing the guide cone 4 and the cutting edge 33, with the cutting edge 33 having a larger face angle than the guide cone 4, when the guide cone 4 cuts in the composite material, as the tool penetrates deeper, the cutting edge 33 cuts and grinds the inner wall of the hole. Because the angle of the cutting edge 33 is greater than that of the guide cone 4, the clearance angle gradually increases as the tool penetrates deeper, thus gradually reducing the friction range between the tool and the processed fiber. Consequently, the friction between the tool and the fiber also gradually decreases. At this point, the fiber experiences more lateral shearing from the guide cone, and the extrusion pressure decreases accordingly. This avoids the problem of excessive friction between the tool's clearance face and the fiber surface, which would reduce the cutting force of the reamer. Furthermore, the alloy material of the tool body 3 and the guide cone 4 makes the tool more stable during drilling of the composite material by the guide cone 4. The thread groove 34 reduces the generation of burrs in the composite material during drilling, and together with the chip guide groove 32, the drilled chips can be better discharged.

[0026] The guide groove 32 divides the cutting edge 33, so that the two cutting edges 33 are spirally arranged in an X shape along the length of the blade body 3, which can make it sharper when cutting composite materials.

[0027] When the tool holder 1 is mounted on the CNC machining center via the connecting seat, and the CNC machining center drives the tool to process the composite material, the guide cone 4 in the tool contacts the composite material, and the protruding design of the drill bit 41 cuts and drills the composite material. As the guide cone 4 continues to penetrate, the tool body 3 expands and shapes the hole diameter. During the drilling process, the fibers in the composite material are first subjected to lateral shearing by the drill bit 41 on the guide cone 4 and then to downward compression by the tool body 3. As the tool body 3 continuously compresses the fibers, the compressive force between the tool and the fibers increases. At this time, the design of the cutting edge 33 can increase the clearance angle of the tool, so that the friction range between the tool and the processed fibers gradually decreases, and the friction force between the tool and the fibers also gradually decreases. At this time, the fibers are subjected to more lateral shearing by the drill bit 41. When the friction force that the tool has to overcome naturally decreases, the compressive force will also decrease, ensuring that the cutting force does not fluctuate and increasing the stability of the tool during processing.

[0028] An angled groove is provided at the junction of the blade 3 and the guide cone 4 to reduce the compression of fiber debris in the composite material and allow it to be discharged better.

[0029] The surface of the cutting edge 33 is provided with threaded grooves 34, and multiple threaded grooves 34 are provided. The multiple threaded grooves 34 are spaced apart from front to back along the length of the cutting edge 33. The design of the threaded grooves 34 on the cutting edge 33 can avoid the generation of burrs during the drilling process.

[0030] The chamfered column 2 has a second chip removal groove 21 on both sides of its surface. The cross-section of the cutting groove 24 is L-shaped and the surface of the cutting groove 24 is smooth. The second chip removal groove 21 is spiral-shaped. The cutting groove 24 is provided at the front end of the inner wall of the second chip removal groove 21. A chamfering blade 23 for cutting chamfers is provided on one side of the cutting groove 24. The chamfering blade 23 is made of PCD material. A chip removal chamfering groove 22 is provided at the junction of the tail end of the second chip removal groove 21 and the outer surface of the chamfered column 2.

[0031] By setting the second chip removal groove 21, after the cutter body 3 is fully inserted into the interior of the composite material for drilling and grinding, the chamfering insert 23 at the front end of the chamfering post 2 can chamfer and grind the hole end. The spiral design of the second chip removal groove 21 can ensure better discharge of fiber chips and avoid fiber chips accumulating in the hole, affecting the cutting force of the tool, and in severe cases, reducing the tool life.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A drill reamer suitable for use with composite materials, characterized in that, Include: The shank (1), the front end of the shank (1) is fixedly installed with chamfer column (2), the front end of the chamfer column (2) is fixedly installed with blade body (3), the front end of the blade body (3) is fixedly installed with guide cone (4), the protruding part of the guide cone (4) is provided with drill (41) capable of drilling composite material, the both sides of the surface of the chamfer column (2) are provided with second chip flute (21), the front end of the inner wall of the second chip flute (21) is provided with tool groove (24), one side of the tool groove (24) is provided with chamfer blade (23) for cutting chamfer, the both sides of the surface of the blade body (3) are provided with blade edge (33), the surface of the blade body (3) and between two blade edges (33) are provided with first chip flute (31), the surface of each blade edge (33) is provided with auxiliary chip flute (32).

2. The drill pilot according to claim 1, characterized in that The surface of the blade edge (33) is provided with thread groove (34), and the thread groove (34) is provided with a plurality of thread grooves (34), and a plurality of thread grooves (34) are arranged along the length direction of the blade edge (33) from front to back.

3. The drill pilot according to claim 1, characterized in that, The cross section of the tool groove (24) is designed as L shape, and the surface of the tool groove (24) is designed as smooth.

4. The drill pilot according to claim 3, characterized in that The junction of the blade body (3) and the guide cone (4) is provided with bevel groove.

5. The drill pilot according to claim 1, characterized in that, The tail end of the second chip flute (21) and the junction of the outer surface of the chamfer column (2) are provided with chip removal chamfer groove (22).

6. The drill pilot according to claim 1, characterized in that, The second chip flute (21) is designed as spiral shape, and the surface of the second chip flute (21) is designed as smooth.

7. The drill pilot according to claim 1, characterized in that, The first chip flute (31) is designed as spiral shape, and the surface of the first chip flute (31) is designed as smooth.

8. The drill pilot according to claim 1, characterized in that, The material of the chamfer blade (23) is PCD material.

9. The drill pilot according to claim 1, characterized in that, The material of the blade body (3) and the guide cone (4) is alloy material.

10. The drill pilot according to claim 1, characterized in that, The tail end of the shank (1) is provided with connecting seat matched with numerical control machining center.

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