Stepped hole reamer

Abstract

The utility model discloses a stepped hole reamer which comprises a reaming part and a chambering part. The reaming part comprises a cutter bar and a cutting edge arranged on the cutter bar, and the cutting edge is arranged at one end of the cutter bar; the reaming part comprises a fixed seat, a reaming cutter and a connecting rod, and is fixedly connected with the cutter bar; the reaming cutter is fixedly arranged on the fixed seat; the connecting rod is fixedly arranged on the fixed seat, and the connecting rod and the fixed seat are coaxially arranged; according to the stepped hole drilling device, when a stepped hole is drilled, the cutting edge drills a hole with a small diameter, and along with continuous stretching, the reaming cutter is in contact with a workpiece to broach the hole until the stepped hole is drilled, so that the stepped hole can be formed at a time.

Description

Technical Field

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

[0002] A reamer is a rotary cutting tool with one or more cutting teeth used to remove 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. In some hydraulic valve parts, it is often necessary to process stepped holes through a reamer. When processing stepped holes, two processes are required to process holes with different diameters respectively, which will lead to a reduction in processing efficiency. At the same time, the tool needs to be replaced during the two processes, and different tool wear conditions will also lead to a decrease in the accuracy of the holes. Summary of the Utility Model

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

[0004] To solve the above problems, the technical solution adopted by the utility model is:

[0005] A stepped hole reamer includes a hole reaming part and a hole enlarging part; the hole reaming part includes a tool shank;

[0006] A cutting edge is arranged at one end of the tool shank;

[0007] The hole enlarging part includes a fixed seat fixedly connected with the tool shank;

[0008] An hole enlarging cutter is fixedly arranged on the fixed seat;

[0009] A connecting rod is fixedly arranged on the fixed seat and is coaxially arranged with the connecting rod.

[0010] Preferably, the fixed seat includes a fixing part and a connecting part, the fixing part is fixedly connected with the tool shank, and the connecting part is fixedly connected with the connecting rod.

[0011] Preferably, the hole enlarging cutter is fixedly arranged on the connecting part, the hole enlarging cutter is of a trapezoidal structure, and includes an hole enlarging edge and a finishing edge, and the hole enlarging edge is inclined.

[0012] Preferably, a first chip removal groove is formed on the fixing part, and the hole enlarging cutter is fixedly arranged in the first chip removal groove.

[0013] Preferably, two hole enlarging cutters are evenly arranged along the circumferential direction.

[0014] Preferably, six cutting edges are evenly arranged along the circumferential direction, and the cutting edges are spirally arranged.

[0015] Preferably, a second chip removal groove is formed between two adjacent cutting edges.

[0016] Preferably, the cutting edge is arranged in an inverted conical shape, the radial dimension of the cutting edge on the side away from the reamer is larger than that on the side close to the reamer, and the taper of the cutting edge is 0.015 / 100 - 0.025 / 100.

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

[0018] 1. In the present utility model, by providing a reaming part and a hole - enlarging part on the reamer for machining stepped holes, the cutting edge on the reaming part can machine small - diameter holes, and the hole - enlarging cutter of the hole - enlarging part can machine large - diameter holes. The machining of stepped holes can be completed through one - time machining, reducing the number of machining times and improving machining efficiency and machining accuracy.

[0019] 2. In the present utility model, the hole - enlarging cutter includes a hole - enlarging edge and a finishing edge. The hole - enlarging edge can enlarge the hole, making the hole larger. After machining, the finishing edge can finish - machine the inner wall of the hole, making the inner wall of the hole smooth and improving machining quality.

[0020] 3. In the present utility model, the cutting edge is in an inverted conical structure, so it can be more smooth during the machining process, preventing the tool from breaking due to excessive tool torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a structural schematic diagram of the present utility model;

[0022] Figure 2 is a structural schematic diagram of the reaming part of the present utility model;

[0023] Figure 3 is a structural schematic diagram of the hole - enlarging part of the present utility model.

[0024] In the figure: 1 is the tool shank, 2 is the cutting edge, 3 is the connecting rod, 4 is the fixing part, 5 is the connecting part, 6 is the hole - enlarging edge, 7 is the finishing edge, 8 is the first chip - discharging groove, and 9 is the second chip - discharging groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] 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.

[0026] 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 construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0027] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. 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 situations.

[0028] As Figures 1 to 3 shown, a stepped hole reamer includes a hole reaming part and a hole expanding part; the hole reaming part includes a tool shank 1 and cutting edges 2 arranged on the tool shank 1. The cutting edges 2 are arranged at the front end of the tool shank 1. The length of the cutting edges 2 is 65 mm. Six cutting edges 2 are evenly arranged along the circumferential direction. The cutting edges 2 are helically arranged and are left-handed by 25 degrees. A second chip removal groove is formed between adjacent two cutting edges 2. During the cutting drilling process, iron chips can be discharged from the second chip removal groove; the hole expanding part includes a fixed seat and a connecting rod 3. The fixed seat is fixedly connected to the rear end of the tool shank 1. One end of the fixed seat away from the tool shank 1 is connected to the connecting rod 3. The connecting rod 3 is connected to the machine tool to drive the reamer to rotate and drill holes. The tool shank 1, the fixed seat and the connecting rod 3 are coaxially arranged. An expanding tool is fixedly arranged on the fixed seat for expanding the hole to form a stepped hole. The radial dimension of the fixed seat is larger than that of the tool shank 1, so that a stepped hole can be machined.

[0029] Furthermore, the fixed seat includes a fixing part 4 and a connecting part 5. The fixing part 4 is fixedly connected to the tool shank 1. The connecting part 5 is fixedly connected to the connecting rod 3. The fixing part 4 is in a frustum shape. The tool shank 1 is fixedly connected to the smaller diameter end of the fixing part 4 by welding. The connecting part 5 is in a cylindrical shape. The diameter of the connecting part is larger than the maximum diameter of the fixing part 4. The diameter of the connecting part 5 is larger than the diameter of the connecting rod 3. The fixing part 4, the connecting part 5 and the connecting rod 3 are integrally formed.

[0030] Furthermore, the reamer is fixedly arranged on the connecting part 5. There are two reamers, which are evenly arranged in the circumferential direction. The reamer is of a trapezoidal structure. The reamer includes a reaming edge 6 and a finishing edge 7. The reaming edge 6 is inclined. During the reaming process, the reaming edge 6 can ream the workpiece during rotation. After the reamer enters the hole, the finishing edge 7 can polish the inner wall of the hole to make the inner wall smoother and flatter. The finishing edge 7 is of a non-edge-opening belt structure and can only polish and finish. After the stepped hole is drilled, the connecting part between the two holes with different diameters is inclined.

[0031] Furthermore, a first chip removal groove is formed on the fixing part 4, and the reamer is fixedly arranged in the first chip removal groove. During reaming and finishing, the cut iron chips are discharged from the first chip removal groove.

[0032] Furthermore, the cutting edge 2 is arranged in an inverted conical shape. The radial dimension of the cutting edge 2 on the side far from the reamer is larger than the radial dimension on the side close to the reamer. The taper of the cutting edge 2 is 0.015 / 100 - 0.025 / 100. Therefore, during the drilling process, the contact area between the cutting edge 2 and the inner wall of the hole is small, which can reduce the resistance and avoid breakage caused by excessive torque during the drilling process.

[0033] It should be noted that before drilling, the bottom hole is first drilled. The diameter of the bottom hole is larger than the diameter of the fixing part 4, and the depth of the bottom hole is greater than the depth of the fixing part 4. After the bottom hole is drilled, the cutting edge drills along the bottom hole. After the reamer enters the bottom hole, it can quickly ream the bottom hole until the stepped hole is drilled. The accuracy requirement of the bottom hole is relatively low. After the bottom hole is completed, drilling the stepped hole can make the stepped hole formed at one time and improve the machining accuracy of the stepped hole.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; 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; and these 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 stepped hole reamer, characterized in that: It comprises a reaming portion and a hole expanding portion; the reaming portion comprises a knife bar (1); A cutting edge (2) is arranged at one end of the tool bar (1); The hole expansion portion comprises a fixing seat fixedly connected to the knife rod (1); A reaming knife, fixedly arranged on a fixed seat; The connecting rod (3) is fixedly arranged on the fixing seat and is coaxially arranged with the connecting rod (3).

2. A stepped hole reamer according to claim 1, characterized in that: The fixing seat comprises a fixing portion (4) and a connecting portion (5), wherein the fixing portion (4) is fixedly connected to the knife rod (1), and the connecting portion (5) is fixedly connected to the connecting rod (3).

3. A stepped hole reamer according to claim 2, characterized in that: The reaming knife is fixedly arranged on the connecting portion (5); the reaming knife is a trapezoidal structure, comprising a reaming blade (6) and a finishing blade (7); the reaming blade (6) is arranged obliquely.

4. A stepped hole reamer according to claim 2, characterized in that: The fixing portion (4) is provided with a first chip removal groove (8), and the reaming tool is fixedly arranged in the first chip removal groove (8).

5. The stepped hole reamer according to claim 1, characterized in that: The reaming cutters are evenly arranged with two along the circumferential direction.

6. A stepped hole reamer according to claim 1, characterized in that: Six cutting edges (2) are evenly arranged along the circumferential direction, and the cutting edges (2) are arranged in a spiral.

7. A stepped hole reamer according to claim 6, characterized in that: A second chip removal groove (9) is formed between two adjacent cutting edges (2).

8. The stepped hole reamer according to claim 1, characterized in that: The cutting edge (2) is arranged in an inverted cone shape, the radial dimension of the cutting edge (2) on the side away from the reaming knife is larger than the radial dimension on the side close to the reaming knife, and the taper of the cutting edge (2) is 0.015 / 100-0.025 / 100.

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