Gear shaping cutter for machining miniature inner hole key groove

Abstract

The utility model relates to the technical field of CNC machining, in particular to a gear shaping cutter for machining a miniature inner hole key groove, which is provided with a cutter handle, the cutter handle is provided with a cutter head, the cutter head comprises a first arc-shaped cutting edge and a second arc-shaped cutting edge, and the two sides of the first arc-shaped cutting edge are respectively provided with a first cutting edge and a second cutting edge. As the included angle between the first arc-shaped cutting edge and the first arc-shaped cutting edge and the included angle between the second arc-shaped cutting edge and the first arc-shaped cutting edge are smaller than 90 degrees, materials can be gradually and evenly removed, a preset angle is formed, and the problems of stress concentration and tearing caused by one-time large-amount cutting are solved; materials are gradually removed by arranging the first cutting edge and the second cutting edge, the problems of material tearing, damage and the like caused by one-time large-amount cutting are avoided, and the overall performance of a product is protected; and the whole machining process can be completed by only one cutter, so that the machining flow is simplified, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of CNC machining, in particular to a gear shaping tool for machining micro inner hole keyways. Background Art

[0002] A gear shaping tool is a cutting tool that precisely produces gear teeth on a workpiece by combining the reciprocating linear motion of the gear shaping machine with the rotational motion of the workpiece. With its multi-edged structure, gear shaping tools can continuously cut multiple tooth grooves in a single stroke. These tools offer high production efficiency and precision, making them suitable for machining internal and external meshing gears and multi-gears. They are widely used in the automotive, machinery, and aviation industries.

[0003] When machining micro-internal keyways, traditional methods often use a single-piece punching tool for one-shot forming. However, this approach presents significant challenges: Because the amount of material removed cannot be precisely controlled, the resulting keyways often exhibit extensive material tearing and damage. Furthermore, excessive material extrusion can create localized stress concentration points, which not only degrades overall performance but also makes precise dimensional control difficult.

[0004] To alleviate these problems, a small milling cutter is typically used to pre-remove excess material around the keyway. Although this method reduces the area of ​​tearing and damage to a certain extent, due to the limitations of the milling cutter's cutting characteristics, it cannot completely remove the material at the keyway corners. This necessitates the addition of multiple roughing punches, which gradually reduce the amount of cutting to achieve finer processing. This increases the complexity of the machining process, reduces overall machining efficiency, and significantly increases tool consumption costs. Furthermore, the gear shaping cutters currently used are generally one-piece. When the cutter head becomes worn after a period of use, the gear shaping cutter head needs to be replaced as a whole, which is wasteful. Summary of the Invention

[0005] To solve the above problems, the present application provides a gear shaping tool for processing micro internal keyways, which is provided with a tool holder, and a tool head is provided on the tool holder, and the tool head includes a first curved blade and a second curved blade, the first curved blade and the second curved blade have the same shape, and a first cutting edge and a second cutting edge are respectively provided on both sides of the first curved blade, and the angles between the first cutting edge and the second cutting edge and the first curved blade are both less than 90°, and a third cutting edge and a fourth cutting edge are provided on both sides of the second curved blade.

[0006] In one embodiment, the cutter head is an irregular polygonal structure, a cutter head mounting groove is provided on the knife handle, and the cutter head is placed in the cutter head mounting groove.

[0007] In one embodiment, a handle locking hole is provided on the knife handle, a head locking hole is provided on the knife head, and a locking pin is provided in the handle locking hole.

[0008] In one embodiment, a mounting positioning plane is provided on the tool handle.

[0009] In one embodiment, the mounting positioning plane is parallel to the axis of the tool handle.

[0010] The beneficial effects of the present invention are:

[0011] The present application discloses a gear shaping tool for machining micro-internal keyways, comprising a tool holder, a tool head disposed on the tool holder, the tool head comprising a first curved blade and a second curved blade, a first cutting edge and a second cutting edge disposed on either side of the first curved blade, and a third cutting edge and a fourth cutting edge disposed on either side of the second curved blade. Since the angle between the first and second cutting edges and the first curved blade is less than 90°, material can be removed gradually and evenly, forming a predetermined angle, thereby avoiding the stress concentration and tearing problems caused by large-scale cutting at one time. Since the entire cutting process adopts a step-by-step processing method, the amount of material cut each time can be precisely controlled, thereby greatly reducing the cutting stress generated by the tool on the material. By gradually removing material by disposing the first and second cutting edges, problems such as material tearing and breakage caused by large-scale cutting at one time are avoided, thereby protecting the overall performance of the product. The entire machining process can be completed with only one tool, thereby simplifying the machining process and improving production efficiency. The number of tool changes and the type of tool changes required are reduced, thereby improving work efficiency. The tool handle and the cutter head are designed to be separated. When the cutter head is damaged, only the cutter head needs to be replaced without replacing the entire tool, which greatly reduces the cost of tool replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of the utility model;

[0013] Figure 2 This is an exploded view of the utility model;

[0014] Figure 3 for Figure 2 Enlarged view of point A;

[0015] Figure 4 For processing product structure diagram;

[0016] Figure 5 Processing state structure Figure 1 ;

[0017] Figure 6 Processing state structure Figure 2 ;

[0018] Figure 7 Processing state structure Figure 3 ;

[0019] Figure 8 Processing state structure Figure 4 ;

[0020] Explanation of symbols in the figure:

[0021] 1. Tool handle; 11. Tool head mounting slot; 12. Tool handle locking hole; 13. Mounting positioning plane;

[0022] 2. Blade head;

[0023] 21, first curved blade; 211, first cutting edge; 212, second cutting edge;

[0024] 22, second curved blade; 221, third cutting edge; 222, fourth cutting edge;

[0025] 23. Cutting head locking hole. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0027] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0028] like Figure 1-8 As shown, a gear shaping tool for processing micro internal keyways is provided with a tool handle 1, and a tool head 2 is provided on the tool handle 1. The tool head 2 includes a first curved blade 21 and a second curved blade 22. The first curved blade 21 and the second curved blade 22 have the same shape. A first cutting edge 211 and a second cutting edge 212 are respectively provided on both sides of the first curved blade 21. The angles between the first cutting edge 211 and the second cutting edge 212 and the first curved blade 21 are both less than 90°. A third cutting edge 221 and a fourth cutting edge 222 are provided on both sides of the second curved blade 22.

[0029] Specifically, the CNC control unit controls the movement of the tool to position it at the starting position of the micro-inner keyway to be machined. Figure 5-8As shown, the CNC system performs step control on the +X axis direction, driving the first curved blade 21 of the tool to gradually enter the center area of ​​the keyway to remove the excess material there. When the center material is removed, the CNC system switches to controlling the step rotation in the C axis direction. During this process, the first cutting edge 211 and the second cutting edge 212 of the tool respectively contact and remove the excess material on both sides of the keyway. Since the angle between the first cutting edge 211 and the second cutting edge 212 and the first curved blade is less than 90°, the material can be removed gradually and evenly, and a predetermined angle is formed, avoiding the stress concentration and tearing problems caused by a large amount of cutting at one time. When the material on both sides of the keyway is removed, the CNC system adjusts the direction again and performs step control on the -X axis direction. At this time, the third cutting edge 221 and the fourth cutting edge 222 of the tool enter the working area to remove the excess material at the peak of the keyway to achieve a more refined processing effect. Repeat multiple times according to the specific size and shape requirements of the keyway to ensure processing accuracy and surface quality. Since the entire cutting process adopts a step-by-step processing method, the amount of material cut each time can be accurately controlled, thereby greatly reducing the cutting stress generated by the tool on the material; by setting the first cutting edge 211 and the second cutting edge 212 to gradually remove material, problems such as material tearing and breakage caused by large-scale cutting at one time are avoided, thereby protecting the overall performance of the product; the entire processing process can be completed with only one tool, which simplifies the processing flow and improves production efficiency; reduces the number of tool changes and the type requirements, thereby improving work efficiency.

[0030] like Figure 2 、 3 As shown, the cutter head 2 is an irregular polygonal structure, a cutter head mounting groove 11 is provided on the knife handle 1, and the cutter head 2 is placed in the cutter head mounting groove 11.

[0031] Specifically, due to its irregular, polygonal structure, the cutter head 2 does not rotate relative to the tool. It is a consumable part during machining and requires frequent replacement. By separating the handle 1 from the cutter head 2, if the cutter head 2 becomes damaged, only the cutter head 2 needs to be replaced, rather than the entire tool. This significantly reduces tool replacement costs. If the cutter head 2 becomes damaged, replacement is relatively quick and simple: the user simply removes the damaged cutter head 2 from the handle 1 and installs a new one, reducing downtime and improving production efficiency.

[0032] like Figure 3 As shown, the knife handle 1 is provided with a knife handle locking hole 12, the knife head 2 is provided with a knife head locking hole 23, and a locking pin shaft (not shown in the figure) is provided in the knife handle locking hole 12.

[0033] Specifically, the design of the shank locking hole 12 and the cutter head locking hole 23 enables the cutter head 2 to be precisely aligned during installation, ensuring that the connection between the cutter head 2 and the shank 1 is accurate. After the locking pin is inserted into the shank locking hole 12 and the cutter head locking hole 23, the shank 1 and the cutter head 2 can be tightly connected, preventing the cutter head from loosening or falling off due to vibration or impact during processing, thereby ensuring the stability and safety of processing. When the cutter head is worn or damaged and needs to be replaced, the cutter head 2 can be easily removed from the shank 1 and a new cutter head can be installed by simply pulling out the locking pin, which simplifies the replacement process and improves work efficiency. The locking pin ensures a precise connection between the cutter head 2 and the shank 1, reducing processing errors caused by loose connections.

[0034] like Figure 1 As shown, the handle 1 is provided with a mounting positioning plane 13 .

[0035] Specifically, the mounting plane 13 provides a precise reference for tool installation on the machine tool. By cooperating with the machine tool's fixture or positioning device, it ensures the tool maintains the correct position and angle during machining, thereby improving machining accuracy. The close contact between the mounting plane and the machine tool fixture helps securely fix the tool to the machine tool, preventing it from loosening or shifting due to vibration or impact during machining.

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] The present application discloses a gear shaping tool for processing micro internal keyways, which is provided with a tool handle 1, on which a tool head 2 is provided, and the tool head 2 includes a first curved blade 21 and a second curved blade 22. A first cutting edge 211 and a second cutting edge 212 are provided on both sides of the first curved blade 21, respectively, and a third cutting edge 221 and a fourth cutting edge 222 are provided on both sides of the second curved blade 22. Since the angle between the first cutting edge 211 and the second cutting edge 212 and the first curved blade is less than 90°, material can be removed gradually and evenly to form a predetermined angle, thereby avoiding stress concentration and tearing problems caused by large-scale cutting at one time. Because the entire cutting process utilizes a step-by-step approach, the amount of material cut each time can be precisely controlled, significantly reducing the cutting stress exerted by the tool on the material. By providing a first cutting edge 211 and a second cutting edge 212 to gradually remove material, problems such as tearing and breakage caused by large-scale cutting at one time are avoided, thereby protecting the overall performance of the product. The entire process can be completed with just one tool, simplifying the process and improving production efficiency. This reduces the number of tool changes and the type of tool required, thereby improving work efficiency. The tool handle 1 and tool head 2 are designed as separate components. If the tool head 2 is damaged, only the tool head 2 needs to be replaced, rather than the entire tool, significantly reducing tool replacement costs.

[0038] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

[0039] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

Claims

1. A gear shaping tool for machining a micro internal keyway, comprising a tool handle (1), a tool head (2) being provided on the tool handle (1), the tool head (2) comprising a first curved blade (21) and a second curved blade (22), the first curved blade (21) and the second curved blade (22) being of the same shape, and characterized in that: A first cutting edge (211) and a second cutting edge (212) are respectively provided on both sides of the first arc-shaped blade (21); the angles between the first cutting edge (211) and the second cutting edge (212) and the first arc-shaped blade (21) are both less than 90°; and a third cutting edge (221) and a fourth cutting edge (222) are provided on both sides of the second arc-shaped blade (22).

2. A gear shaping tool for machining a micro internal keyway according to claim 1, characterized in that: The cutter head (2) has an irregular polygonal structure, a cutter head mounting groove (11) is provided on the knife handle (1), and the cutter head (2) is placed in the cutter head mounting groove (11).

3. The gear shaping tool for machining a micro internal keyway according to claim 1, characterized in that: The knife handle (1) is provided with a knife handle locking hole (12), the knife head (2) is provided with a knife head locking hole (23), and a locking pin is provided in the knife handle locking hole (12).

4. The gear shaping tool for machining a micro internal keyway according to claim 1, characterized in that: The knife handle (1) is provided with a mounting positioning plane (13).

5. The gear shaping tool for machining a micro internal keyway according to claim 4, characterized in that: The installation positioning plane (13) is parallel to the axis of the tool handle (1).

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