Composite reamer

Abstract

The utility model discloses a composite reamer which comprises a reamer bar, a first reamer holder, a first reamer head, a second reamer holder and a second reamer head, the reamer bar is connected with a machine tool, the machine tool can enable the reamer to rotate and conduct reaming, the first reamer holder is fixedly connected with the reamer bar, the second reamer holder is fixedly connected with the first reamer holder, and the second reamer head is fixedly connected with the second reamer holder. The tool bar, the first tool apron and the second tool apron are coaxially arranged, the first tool bit is fixedly arranged on the first tool apron, the second tool bit is fixedly arranged on the second tool apron, in the reaming process, the second tool bit is used for reaming, and the second tool bit is used for sleeking and polishing the inner wall of a reamed hole. And meanwhile, the reamer can be positioned, the reamer is prevented from being bent, and the reaming precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of reamers, in particular to a composite reamer. Background Art

[0002] A reamer is a rotary tool with one or more cutting teeth for removing a thin layer of metal from the surface of a machined hole. A reamer is a rotary finishing tool with a straight edge or a spiral edge, used for enlarging or finishing a hole. During the process of reaming a workpiece with a reamer, since the cutting head needs to cut the workpiece, burrs will be generated on the inner wall of the hole during cutting, which affects the accuracy of the hole. And if the hole depth is too large, the reamer is prone to bending during the reaming process, which will also affect the accuracy of reaming. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a composite reamer for the deficiencies of the above-mentioned prior art.

[0004] To solve the above problems, the technical solutions adopted by the utility model are as follows:

[0005] A composite reamer includes a tool shank;

[0006] A first tool holder fixedly connected to the tool shank;

[0007] A first cutting head fixedly arranged on the first tool holder;

[0008] A second tool holder fixedly connected to the first tool holder, and the tool shank, the first tool holder and the second tool holder are coaxially arranged;

[0009] A second cutting head fixedly arranged on the second tool holder for reaming the hole.

[0010] Preferably, the tool shank includes a fixed rod and a connecting rod, and both ends of the connecting rod are respectively connected to the first tool holder and the fixed rod.

[0011] Preferably, the diameter of the fixed rod is larger than that of the connecting rod.

[0012] Preferably, a cooling channel is arranged on the reamer. The cooling channel includes a main water outlet hole and a branch water outlet hole. The main water outlet hole is opened on the tool shank, the first tool holder and the second tool holder, and the branch water outlet hole is arranged on the second tool holder, and the branch water outlet hole is communicated with the main water outlet hole.

[0013] Preferably, the branch water outlet hole is inclined.

[0014] Preferably, one end of the second cutting head far from the first cutting head is an arc structure.

[0015] Preferably, the second cutting head is a spiral structure.

[0016] Preferably, a chip removal groove is provided on the second tool holder.

[0017] The beneficial effects of adopting the above technical solutions are as follows:

[0018] 1. In the present utility model, the reamer includes a tool shank, a first tool holder and a second tool holder. The tool shank is connected to a machine tool. A second cutting head is provided on the second tool holder for reaming a workpiece. A first cutting head is provided on the first tool holder for polishing the surface of the reamed hole, removing burrs on the surface of the reamed hole, making the surface of the reamed hole smoother, and improving the quality and precision of the reamed hole.

[0019] 2. In the present utility model, the first cutting head can also be used for positioning the reamer. When the depth of the reamed hole is relatively deep, the second cutting head is used for reaming, while the first cutting head is used for positioning to prevent the reamer from bending and improving the precision of the reamed hole. Description of the Drawings

[0020] Figure 1 is a structural schematic diagram of the present utility model;

[0021] Figure 2 is a cross-sectional view of the first tool holder of the present utility model;

[0022] Figure 3 is a cross-sectional view of the second tool holder of the present utility model.

[0023] In the figure: 1 is the tool shank, 2 is the first tool holder, 3 is the first cutting head, 4 is the second tool holder, 5 is the second cutting head, 6 is the fixing rod, 7 is the connecting rod, 8 is the main water outlet hole, 9 is the branch water outlet hole, and 10 is the chip removal groove. Detailed Embodiments

[0024] The following further describes in detail the embodiments of the present utility model in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.

[0025] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] As Figures 1 to 3 shown, a composite reamer includes a tool shank 1, a first tool holder 2, a first cutting head 3, a second tool holder 4, and a second cutting head 5. The tool shank 1 is fixedly connected to the first tool holder 2, the second tool holder 4 is fixedly connected to the first tool holder 2, the tool shank 1, the first tool holder 2, and the second tool holder 4 are coaxially arranged, and the tool shank 1, the first tool holder 2, and the second tool holder 4 are integrally formed by machining. The first cutting head 3 is fixedly arranged on the first tool holder 2, the second cutting head 5 is fixedly arranged on the second tool holder 4, and a chip removal groove 10 is arranged on the second tool holder 4 for discharging iron chips. In the present utility model, when reaming a workpiece, the reamer is arranged on a machine tool, the tool shank 1 is fixedly connected to the machine tool, and the machine tool drives the reamer to rotate to ream the workpiece. During the reaming process, the second cutting head 5 drills the workpiece. As the reaming depth continuously increases, the first cutting head 3 enters the reamed hole. The first cutting head 3 is a grinding tool, and the outer end surface of the first cutting head 3 and the outer end surface of the second cutting head 5 are located on the same circumferential surface. Therefore, the inner wall of the reamed hole can be polished; at the same time, if the reamed hole is relatively deep, the first cutting head 3 is in contact with the inner wall of the reamed hole, and it can also play a positioning role to prevent the reamer from bending and reducing the reaming accuracy.

[0028] It should be noted that the first tool holder 2 is a cylindrical structure, and a plurality of grooves are uniformly arranged on the first tool holder 2 along the circumferential direction. In this embodiment, four grooves are arranged on the first tool holder 2, and the first cutting head 3 is fixedly arranged in the grooves. The cutting surface of the first cutting head 3 protrudes from the circumferential surface of the first tool holder 2. Therefore, chips can be discharged smoothly and it will not prevent the first cutting head 3 from polishing the inner wall of the reamed hole; a plurality of spiral fixing blocks are uniformly arranged on the second tool holder 4 along the circumferential direction. The second cutting head 5 is a spiral structure, and the second cutting head 5 is fixedly arranged on the fixing blocks. In this embodiment, both the fixing blocks and the second cutting heads are provided with six. A certain gap is left between adjacent two fixing blocks to form a chip removal groove 10 for discharging iron chips.

[0029] Further, the tool shank 1 includes a fixed rod 6 and a connecting rod 7. The fixed rod 6 is used to connect with the machine tool. Both ends of the connecting rod 7 are respectively connected with the first tool holder 2 and the fixed rod 6. The connecting rod 7 is used to connect the fixed rod 6 and the first tool holder 2. The fixed rod 6, the connecting rod 7 and the first tool holder 2 are coaxially arranged. The diameter of the fixed rod 6 is larger than that of the connecting rod 7, and the diameter of the connecting rod 7 is larger than or equal to that of the first tool holder 2. Therefore, the iron filings generated during reaming can be discharged from the reamed hole without the phenomenon of poor chip evacuation.

[0030] Further, a cooling channel is provided on the reamer. The cooling channel includes a main water outlet hole 8 and a branch water outlet hole 9. The main water outlet hole 8 is opened on the tool shank 1, the first tool holder 2 and the second tool holder 4. The main water outlet hole 8 is a blind hole. The open end of the main water outlet hole 8 is located on the side of the guide rod 1 away from the first tool holder 2, and the closed end of the main water outlet hole 8 is located in the second tool holder 4. The branch water outlet hole 9 is provided on the second tool holder 4. The branch water outlet hole 9 is inclined. The branch water outlet hole 9 is communicated with the main water outlet hole 8. Specifically, one end of the branch water outlet hole 9 is communicated with the main water outlet hole 9, and the other end is located on the side wall of the second tool holder 4. Therefore, the cooling water can enter the water outlet hole 9 from the main water outlet hole 8 and be discharged from the side wall of the second tool holder 4 to cool the reamer during the reaming process.

[0031] Further, the end of the second cutting head 5 away from the first cutting head 3 is an arc structure. When the bottom of the reamed hole is an arc structure, one end of the second cutting head 5 is an arc structure. Therefore, an arc structure can be formed at the bottom of the reamed hole during the reaming process.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, such modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A composite reamer, characterized in that, It includes a tool shank (1); A first tool holder (2), fixedly connected to the tool shank (1); A first tool bit (3), fixedly arranged on the first tool holder (2); A second tool holder (4), fixedly connected to the first tool holder (2), and the tool shank (1), the first tool holder (2) and the second tool holder (4) are coaxially arranged; A second tool bit (5), fixedly arranged on the second tool holder (4) for reaming a hole.

2. The composite reamer according to claim 1, characterized in that, The tool shank (1) includes a fixed rod (6) and a connecting rod (7), and both ends of the connecting rod (7) are respectively connected to the first tool holder (2) and the fixed rod (6).

3. The composite reamer according to claim 2, characterized in that, The diameter of the fixed rod (6) is larger than that of the connecting rod (7).

4. A composite reamer according to claim 1, characterized in that, The reamer is provided with a cooling channel, and the cooling channel includes a main water outlet hole (8) and a branch water outlet hole (9). The main water outlet hole (8) is opened on the tool shank (1), the first tool holder (2) and the second tool holder (4), and the branch water outlet hole (9) is arranged on the second tool holder (4), and the branch water outlet hole (9) is communicated with the main water outlet hole (8).

5. The composite reamer according to claim 4, characterized in that, The branch water outlet hole (9) is inclinedly arranged.

6. The composite reamer according to claim 1, characterized in that, One end of the second tool bit (5) far from the first tool bit (3) is an arc-shaped structure.

7. A composite reamer according to claim 1, characterized in that, The second tool bit (5) is a spiral structure.

8. A composite reamer according to claim 1, characterized in that, A chip removal groove (10) is arranged on the second tool holder (4).

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