Combined composite reamer

Abstract

The combined type composite reamer comprises a reamer handle and a reamer head which are connected, the reamer head comprises a reamer head front section, a reaming section and a reamer head rear section which are integrally connected from front to back, and the diameter of the reamer head front section is smaller than that of the reaming section; a plurality of first reaming blades are welded to the outer wall of the tool bit front section in the circumferential direction at equal intervals. A plurality of second reaming blades are welded to the outer wall of the reaming section in the circumferential direction at equal intervals. According to the utility model, the detachable connection between the cutter handle and the cutter head is realized through the structural design, and the first reaming blade and the second reaming blade welded on the cutter head participate in cutting at the same time, so that the axial resistance is uniform in the drilling process, and the overall swing of the cutter is small and the rigidity is large; and the first reaming blade and the second reaming blade are welded, so that the fixity and the machining stability are better, and the stability in the machining process can be improved.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, specifically to a combined composite reamer. Background Technology

[0002] As a crucial structural component of continuously variable transmissions (CVTs), the CVT housing is complex in structure and requires multiple design and functional specifications, including strength, sealing, and heat dissipation. Its hole machining is characterized by long overhangs, multiple coaxial diameters, and large spans. Currently, CVT housing machining typically uses one-piece welded CBN inserts. The drawbacks of this tooling method are: high tool manufacturing costs; in long overhang conditions, reducing overall tool oscillation requires lower cutting speeds, which easily leads to built-up edge, affecting machining quality; and when machining coaxial multi-segment large-span diameter holes, multiple tools are usually required, resulting in long tool change times, increased production costs, and reduced production efficiency, necessitating improvement. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a combined composite reamer to solve the technical problems of low processing quality and low processing efficiency in the processing of CVT transmission housing.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A combined composite reamer includes a tool holder and a tool head connected together. The tool head includes a front section, a reaming section, and a rear section integrally connected from front to back. The diameter of the front section is smaller than the diameter of the reaming section. Multiple first reaming inserts are welded at equal intervals along the circumference on the outer wall of the front section. Multiple second reaming inserts are welded at equal intervals along the circumference on the outer wall of the reaming section.

[0006] This utility model also has the following technical features:

[0007] Specifically, a mounting hole is provided at the center of the rear end face of the tool holder, and the inner contour of the mounting hole matches the outer contour of the rear section of the tool head.

[0008] Furthermore, a plurality of first threaded connection holes are provided on the rear end face of the tool holder around the periphery of the mounting hole.

[0009] Furthermore, the diameter of the rear section of the cutter head is smaller than the diameter of the reaming section.

[0010] Furthermore, there are four of each of the first and second reaming inserts.

[0011] Furthermore, the reaming section has multiple axially penetrating second threaded connection holes around the periphery of the front section of the cutter head; the number of the first threaded connection holes and the second threaded connection holes are both four, and the first threaded connection holes and the second threaded connection holes can be coaxially connected.

[0012] Furthermore, the cutting edge of the first reaming insert is chamfered at the end away from the reaming section.

[0013] Furthermore, it also includes connecting bolts that pass through the first threaded connection hole and the second threaded connection hole.

[0014] Furthermore, the angle between the second reaming insert and the front end face of the reaming section is 5°.

[0015] Furthermore, it also includes connecting bolts that pass through the first threaded connection hole and the second threaded connection hole.

[0016] Furthermore, the front end of the tool holder has multiple radial limiting holes at equal intervals along the circumference, and a radial adjusting screw is inserted into the radial limiting hole. The tail end of the radial adjusting screw can abut against the rear section of the tool head.

[0017] Compared with the prior art, this utility model has the following technical effects:

[0018] This invention achieves a detachable connection between the tool holder and the tool head through structural design. The first and second reaming inserts welded to the tool head participate in cutting simultaneously, ensuring uniform axial resistance during drilling and thus minimizing overall tool wobble and maximizing rigidity. The tool holder is an integral structure, which enhances the rigidity and dimensional stability of the reamer under long overhang machining conditions. The first and second reaming inserts are welded, resulting in better fixation and machining stability. Using this invention can reduce the number of tool changes during machining and improve machining efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the cutter head structure;

[0021] Figure 3 This is a schematic diagram of the tool holder structure.

[0022] The meanings of the labels in the diagram are as follows:

[0023] 1-Tool holder, 2-Tool head, 3-First reaming insert, 4-Second reaming insert, 5-Connecting bolt, 6-Limiting pin; 11-Mounting hole, 12-First threaded connection hole, 13-Radial limiting hole; 21-Front section of tool head, 22-Reaming section, 23-Rear section of tool head, 24-Second threaded connection hole. Detailed Implementation

[0024] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0025] In the description of the orientation of this utility model, the terms "up", "down", "front", "back", "left", "right", etc., indicate the orientation or positional relationship only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Unless otherwise stated, the terms "installed," "connected," "joined," and "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two components or an interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] Unless otherwise specified, all components in this invention are made from components known in the prior art.

[0028] Example 1:

[0029] Following the above technical solutions, such as Figures 1 to 3 As shown, this embodiment provides a combined composite reamer, including a detachably connected tool holder 1 and a tool head 2. The tool head 2 includes a front section 21, a reaming section 22, and a rear section 23 integrally connected from front to back. The diameter of the front section 21 is smaller than the diameter of the reaming section 22. Multiple first reaming inserts 3 are welded at equal intervals along the circumference of the outer wall of the front section 21. Multiple second reaming inserts 4 are welded at equal intervals along the circumference of the outer wall of the reaming section 22. Compared to mounting inserts, the welding method can improve the dimensional stability under long overhang machining conditions.

[0030] Preferably, both the first reaming insert 3 and the second reaming insert 4 are carbide inserts. Compared with CBN inserts, carbide inserts are cheaper and have a lower overall manufacturing cost.

[0031] Since the holes to be machined are coaxial multi-segment holes with a large span diameter (i.e., the diameter span between the two holes is large and the axial distance is small), using a first reaming insert 3 and a second reaming insert 4 located at different diameter positions on the tool head can meet the requirements of machining cost and high coaxiality. During machining, the rear end of the tool holder can be directly connected to the machine tool spindle.

[0032] As a preferred embodiment, a mounting hole 11 is provided at the center of the rear end face of the tool holder 1. The inner contour of the mounting hole 11 matches the outer contour of the rear section 23 of the tool head. With the help of the mounting hole 11 and the rear section 23 of the tool head, the tool holder 1 can be inserted and engaged with the tool head 2.

[0033] As a preferred embodiment, a plurality of first threaded connection holes 12 are provided on the rear end face of the tool holder 1 around the periphery of the mounting hole 11.

[0034] As a preferred embodiment, the diameter of the rear section 23 of the cutter head is smaller than the diameter of the reaming section 22.

[0035] As a preferred embodiment, the number of the first reaming blade 3 and the second reaming blade 4 are both four.

[0036] As a preferred embodiment of this invention, such as Figure 2 As shown, multiple axially penetrating second threaded connection holes 24 are provided around the periphery of the front section 21 of the cutter head in the reaming section 22; there are four first threaded connection holes 12 and four second threaded connection holes 24, and the first threaded connection holes 12 and the second threaded connection holes 24 can be coaxially connected.

[0037] The second threaded connection hole 24 includes a first hole segment and a second hole segment that are coaxially connected from front to back, and a limiting step surface is formed at the connection between the first hole segment and the second hole segment.

[0038] As a preferred embodiment, the cutting edge of the first reaming insert 3 at the end away from the reaming section 22 is provided with a chamfer, which can reduce the cutting resistance of the first reaming insert 3.

[0039] As a preferred embodiment, it also includes a connecting bolt 5 that passes through the first threaded connection hole 12 and the second threaded connection hole 24.

[0040] As a preferred embodiment, the angle between the second reaming blade 4 and the front end face of the reaming section 22 is 5° to ensure that the second reaming blade 4 does not interfere with the bottom wall of the hole when the hole is reamed to the bottom.

[0041] As a preferred embodiment, the front end of the tool holder 1 has a plurality of radial limiting holes 13 at equal intervals along the circumference. A radial adjusting screw 6 is inserted into the radial limiting hole 13. The tail end of the radial adjusting screw 6 can abut against the rear section 23 of the tool head. The coaxiality between the tool head 2 and the tool holder 1 can be adjusted by means of the radial adjusting screw 6.

[0042] In operation, this utility model works as follows: the cutting head 1 and the tool holder 2 are connected by connecting bolts 5 passing through the first threaded connection hole 12 and the second threaded connection hole 24 to assemble the composite reamer. The machining dimensions are adjusted with the assistance of a tool setter. The cutting head and the tool holder are made coaxial by adjusting screws 6 to achieve the coaxiality requirement. The composite reamer is then mounted on the machine tool spindle for tool setting and adjustment to determine the safety plane and machining depth to ensure no interference. The rotation speed and feed rate are input to confirm the correct machining program. The machine tool safety door is closed, and machining begins. During machining, the first reaming insert 3 and the second reaming insert 4 can simultaneously cut holes with different diameter spans.

[0043] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0044] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0045] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A combined composite reamer, comprising a handle (1) and a cutting head (2) connected together, characterized in that, The cutting head (2) includes a cutting head front section (21), a reaming section (22) and a cutting head rear section (23) that are integrally connected from front to back. The diameter of the cutting head front section (21) is smaller than the diameter of the reaming section (22). Multiple first reaming inserts (3) are welded at equal intervals along the circumference on the outer wall of the cutting head front section (21). Multiple second reaming inserts (4) are welded at equal intervals along the circumference on the outer wall of the reaming section (22).

2. The combined composite reamer as described in claim 1, characterized in that, The tool holder (1) has a mounting hole (11) at the center of its rear end face, and the inner contour of the mounting hole (11) matches the outer contour of the rear section (23) of the tool head.

3. The combined composite reamer as described in claim 2, characterized in that, The tool holder (1) has a plurality of first threaded connection holes (12) on its rear end face surrounding the mounting hole (11).

4. The combined composite reamer as described in claim 1, characterized in that, The diameter of the rear section (23) of the cutter head is smaller than the diameter of the reaming section (22).

5. The combined composite reamer as described in claim 1, characterized in that, The number of the first reaming blade (3) and the second reaming blade (4) are both four.

6. The combined composite reamer as described in claim 3, characterized in that, The reaming section (22) has multiple axially penetrating second threaded connection holes (24) around the periphery of the front section (21) of the cutter head; the number of the first threaded connection hole (12) and the second threaded connection hole (24) are both four, and the first threaded connection hole (12) and the second threaded connection hole (24) can be coaxially connected.

7. The combined composite reamer as described in claim 1, characterized in that, The first reaming insert (3) has a chamfer at the end away from the reaming section (22).

8. The combined composite reamer as described in claim 6, characterized in that, It also includes connecting bolts (5) that pass through the first threaded connection hole (12) and the second threaded connection hole (24).

9. The combined composite reamer as described in claim 1, characterized in that, The angle between the second reaming insert (4) and the front end face of the reaming section (22) is 5°.

10. The combined composite reamer as described in claim 1, characterized in that, The front end of the tool holder (1) has multiple radial limiting holes (13) at equal intervals along the circumference. A radial adjusting screw (6) is inserted into the radial limiting hole (13), and the tail end of the radial adjusting screw (6) can abut against the rear section (23) of the tool head.

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