A split shaving cutter for machining a gear

Abstract

The utility model discloses a kind of split shaving cutter for machining gear, to solve the problem of high cost of traditional integrated structure, waste resources, realize tool body replacement alone, tool holder reuse, it includes tool body and steel tool holder, tool body coaxial sleeve is connected in tool holder, tool holder is equipped with root cleaning, first reference surface and the blocking ring of second reference surface with inclination, tool body is positioned by lower end face adhering first reference surface, connecting through-hole wall abutting second reference surface, and is connected with cooperation positioning bolt.The stress concentration is reduced by being equipped with avoidance ring groove, the stability of positioning member and positioning groove adaptation enhances, positioning member adopts rectangular part and semicircular part adhering structure, inside side angle is equipped with avoidance cutting surface to facilitate assembly and disassembly.The design reduces cost, improves machining precision stability and structural reliability, optimizes assembly efficiency.

Description

Technical Field

[0001] This utility model relates to the field of tooth scraping cutter technology, and in particular to a split tooth scraping cutter for processing gears. Background Technology

[0002] In modern industrial production systems, gears, as core components for mechanical transmission, directly impact the operational accuracy, efficiency, and reliability of various mechanical equipment. They are widely used in numerous key fields such as automotive manufacturing, aerospace, precision instruments, and robotics. With the continuous upgrading of industrial technology, the performance requirements for gears are becoming increasingly stringent, especially for small-module gears. Due to their compact structure, high transmission accuracy, and strong load-bearing capacity, the demand for small-module gears in precision equipment such as micro-transmission systems, servo motors, and medical devices continues to rise. This places higher demands on the machining technology of small-module gears, requiring not only extremely high machining accuracy but also efficient production capabilities to meet the needs of large-scale manufacturing. However, traditional gear machining methods, such as hobbing and shaping, can no longer meet these requirements. Therefore, there is an urgent need to research and develop new processes and technologies for gear machining.

[0003] As an innovative machining process, gear scraping technology offers higher production efficiency than traditional gear machining methods. Especially in the machining of small-module internal gears, compared to traditional gear hobbing and gear shaping methods, high-power gear scraping technology can increase production efficiency by more than 4 times and also improve machining accuracy by 1-2 grades.

[0004] As a key component, the current one-piece cemented carbide structure of the tooth scraper suffers from high cost. Because the teeth are prone to wear and require periodic replacement, the one-piece design necessitates replacing the tool holder along with the cutting head, resulting in resource waste and increased costs, thus hindering the widespread adoption of tooth scraping technology. Therefore, developing a tooth scraper with a separate cutting head and tool holder, allowing for individual cutting head replacement and tool holder reuse, is of great significance for cost reduction, efficiency improvement, and promoting technology application. Utility Model Content

[0005] This invention addresses the problems of high cost and resource waste associated with integrating the cutter head and cutter holder, by providing a separate gear scraper for gear machining that allows for separate cutter head replacement, reuse of the cutter holder, and low cost.

[0006] This utility model provides the following technical solution: A split-type gear scraper for processing gears includes a cutter body and a cutter holder. The cutter body is coaxially sleeved on the cutter holder. A root clearing is provided at the central axis of the cutter holder. A first reference surface is formed at the circumferential edge of the upper end face of the cutter holder. A retaining ring protrudes upward at the connection between the first reference surface and the root clearing. The outer wall surface of the retaining ring is a second reference surface. The second reference surface is inclined outward from top to bottom. The lower end face of the cutter body is attached to the first reference surface. A connecting through hole is provided at the central axis of the cutter body. The wall surface of the connecting through hole abuts against the second reference surface. A plurality of first positioning holes are provided on the first reference surface. The first positioning holes are evenly distributed around the central axis of the cutter holder. A second positioning hole corresponding to the first positioning hole is provided on the cutter body. The first positioning hole and the second positioning hole are connected by positioning bolts.

[0007] In some embodiments, a clearance ring groove is provided at the connection between the first reference surface and the second reference surface.

[0008] In some embodiments, the tool holder is a steel structure.

[0009] In some embodiments, a first positioning groove is provided on the first reference surface, a positioning element is adapted in the first positioning groove, a second positioning groove corresponding to the first positioning groove is provided on the lower end face of the cutter body, and the upper end of the positioning element is adapted in the second positioning groove.

[0010] In some embodiments, the positioning member is provided with a first fixing hole, and the first positioning groove is provided with a second fixing hole that mates with the first fixing hole. The first fixing hole and the second fixing hole are connected by a fixing bolt.

[0011] In some embodiments, the horizontal cross-section of the positioning member consists of a rectangular portion and a semi-circular portion. The rectangular portion is located inside the semi-circular portion, and the length of the long side of the rectangular portion is equal to the diameter of the semi-circular portion. The long side of the rectangular portion and the diameter of the semi-circular portion are fitted together.

[0012] In some embodiments, a clearance cut surface is provided at the inner corner of the rectangular portion.

[0013] Compared with the prior art, the advantages of this utility model are:

[0014] Significantly reduced operating costs: The separate design of the cutter body and the tool holder solves the problem of having to replace the entire cutter head when it wears out in the traditional integral structure. Only the worn cutter body needs to be replaced, and the tool holder can be reused. At the same time, the tool holder is made of steel, which saves costs, greatly reduces resource waste, and lowers equipment maintenance and consumable costs, making it more conducive to the promotion and application of tooth scraping technology.

[0015] Improved machining accuracy and stability: The dual positioning structure, with the first reference surface fitting against the lower end face of the tool body and the second reference surface abutting against the wall of the connecting through hole, combined with the tightening effect of the positioning bolts, can accurately ensure the coaxiality of the tool body and the tool holder, effectively controlling gear machining errors. It is especially suitable for machining small module gears with stringent precision requirements. The second reference surface is inclined outward from top to bottom, which can form a wedge fit when the tool body and the tool holder are assembled. As the positioning bolts are tightened, the contact surface between the tool body and the tool holder will generate radial preload, further eliminating assembly gaps, enhancing the stability of positioning accuracy, and reducing vibration errors caused by gaps during machining.

[0016] Enhanced structural reliability and durability: The avoidance ring groove design at the connection of the first and second reference surfaces reduces stress concentration and improves the overall strength and fatigue resistance of the tool holder; the matching structure of the positioning component and the positioning groove can not only strengthen the connection stability between the tool body and the tool holder and prevent positional displacement caused by machining vibration, but also effectively transmit torque to avoid relative rotation, thus fully ensuring the stability of the machining process and the service life of the tool.

[0017] Structural linkage enhances overall performance: The fit between the first reference surface and the lower end face of the tool body achieves precise axial positioning, while the inclined setting of the second reference surface forms a radial wedge fit with the wall of the connecting through hole of the tool body. Together, they form a three-dimensional positioning system for axial and radial directions. With the tightening force of the positioning bolts, axial and radial clearances can be eliminated simultaneously, significantly improving the overall coaxiality and connection rigidity of the tool body and tool holder. At the same time, the clearance ring groove at the connection of the first and second reference surfaces can specifically disperse the local stress generated by the wedge fit. The inclined second reference surface is prone to stress concentration at the connection under preload, but the clearance ring groove resolves this problem through a spatial buffer structure, preventing the tool holder from cracking or deforming due to long-term stress. This structural linkage of positioning enhancement and stress dispersion not only ensures the high-precision positioning advantage of the dual reference surfaces but also extends the service life of the tool holder, achieving a synergistic improvement in machining accuracy and structural durability.

[0018] Optimize assembly convenience: The positioning component adopts a cross-sectional structure in which a rectangular part and a semi-circular part fit together, and an avoidance tangent is set on the inner corner of the rectangular part. While ensuring positioning accuracy, it simplifies the installation and disassembly of the positioning component and improves the efficiency of tool assembly and maintenance. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0022] Figure 3 This is a top view of the blade of this utility model.

[0023] Figure 4 This is a bottom view of the blade of this utility model.

[0024] Figure 5 This is a schematic diagram of the tool holder of this utility model;

[0025] Figure 6 This is a structural schematic diagram of the tool holder of this utility model from another angle;

[0026] Figure 7 This is a schematic diagram of the positioning component of this utility model;

[0027] Figure 8 This is a horizontal cross-sectional view of the positioning component of this utility model.

[0028] In the figure: 1. Tool body; 11. Connecting through hole; 12. Second positioning hole; 13. Second positioning groove; 2. Tool holder; 21. Root clearing; 22. First reference surface; 23. Retaining ring; 24. Second reference surface; 25. First positioning hole; 26. Avoidance ring groove; 27. First positioning groove; 28. Second fixing hole; 3. Positioning bolt; 4. Positioning component; 41. First fixing hole; 42. Rectangular part; 43. Semi-circular part; 44. Avoidance cut surface; 5. Fixing bolt. Detailed Implementation

[0029] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0030] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0032] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0033] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0034] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0035] Please see Figure 1-2 As shown in this embodiment: a split-type gear scraper for machining gears includes a cutter body 1 and a cutter holder 2. The cutter body 1 is coaxially sleeved on the cutter holder 2. A root clearing 21 is provided at the central axis of the cutter holder 2. A first reference surface 22 is formed at the circumferential edge of the upper end face of the cutter holder 2. A retaining ring 23 protrudes upward at the connection between the first reference surface 22 and the root clearing 21. The outer wall surface of the retaining ring 23 is a second reference surface 24. The second reference surface 24 is inclined outward from top to bottom. The lower end face of the cutter body 1 is attached to the first reference surface 22. A connecting through hole 11 is provided at the central axis of the cutter body 1. The wall surface of the connecting through hole 11 is tightly fitted with the second reference surface 24. A plurality of first positioning holes 25 are provided on the first reference surface 22. The first positioning holes 25 are evenly distributed around the central axis of the cutter holder 2. The cutter body 1 is provided with second positioning holes 12 corresponding to the first positioning holes 25. The first positioning holes 25 and the second positioning holes 12 are connected by positioning bolts 3.

[0036] It should be noted that the separate design of the tool body 1 and tool holder 2 means that after the tool body 1 wears out, only the tool holder 2 needs to be replaced, which can be reused, reducing resource waste and lowering equipment maintenance and consumable costs. The dual positioning, with the first reference surface 22 fitting against the lower end face of the tool body 1 and the second reference surface 24 abutting against the wall of the connecting through hole 11, combined with the fastening of the positioning bolts 3, can accurately ensure the coaxiality of the two and effectively control machining errors. The inclined setting of the second reference surface 24 forms a radial preload during assembly as the bolts are tightened, eliminating assembly gaps and reducing machining vibration errors. The evenly distributed positioning bolts 3 make the connection more secure and prevent loosening. The reasonable positioning structure design facilitates the precise assembly of the tool body 1 and tool holder 2, improves the convenience of operation, and ensures the stability and reliability of the machining process.

[0037] In some embodiments, such as Figures 3-6 As shown, a relief ring groove 26 is provided at the connection between the first reference surface 22 and the second reference surface 24. It should be noted that the inclined setting of the second reference surface 24 forms a radial wedge fit with the wall of the connecting through hole 11 of the tool body 1. The relief ring groove 26 can specifically disperse the local stress generated by the wedge fit. The inclined second reference surface 24 is prone to stress concentration at the connection under the action of pre-tightening force. The relief ring groove 26 resolves this problem through a spatial buffer structure, preventing the tool holder 2 from cracking or deforming due to long-term stress.

[0038] In some embodiments, such as Figures 5-6 As shown, the tool holder 2 is made of steel. It should be noted that the cost of the steel tool holder 2 is significantly lower than that of the cemented carbide material used in the tool body 1. In addition, steel is easier to process and has lower manufacturing costs, which further reduces resource waste and equipment maintenance and consumable costs.

[0039] In some embodiments, such as Figure 2 As shown, a first positioning groove 27 is provided on the first reference surface 22, and a positioning element 4 is adapted to fit in the first positioning groove 27. A second positioning groove 13 corresponding to the first positioning groove 27 is provided on the lower end face of the tool body 1. The upper end of the positioning element 4 is adapted to fit in the second positioning groove 13. It should be noted that the adaptation structure of the first positioning groove 27, the second positioning groove 13 and the positioning element 4 can realize the pre-positioning of the tool body 1 and the tool holder 2, and improve the assembly alignment accuracy. At the same time, through the fitting constraint of the positioning element 4, the relative rotation caused by torque or vibration during the processing is effectively prevented, further enhancing the connection stability and reducing the processing error caused by position offset.

[0040] In some embodiments, such as Figures 6-7As shown, the positioning component 4 is provided with a first fixing hole 41, and the first positioning groove 27 is provided with a second fixing hole 28 that mates with the first fixing hole 41. The first fixing hole 41 and the second fixing hole 28 are connected by fixing bolts 5. It should be noted that the positioning component 4 is rigidly fixed to the tool holder 2 through the connection of the first fixing hole 41, the second fixing hole 28 and the fixing bolts 5, which prevents the positioning component 4 from shifting or falling off due to force during processing and ensures that the positioning constraint is continuously effective. At the same time, the detachable bolt connection facilitates the individual replacement and maintenance of the positioning component 4 and extends the overall service life of the tool holder 2.

[0041] In some embodiments, such as Figure 8 As shown, the horizontal cross-section of the positioning component 4 consists of a rectangular portion 42 and a semi-circular portion 43. The rectangular portion 42 is located inside the semi-circular portion 43, and the length of the long side of the rectangular portion 42 is equal to the diameter of the semi-circular portion 43. The long side of the rectangular portion 42 and the diameter of the semi-circular portion 43 are fitted together. It should be noted that the positioning component 4 adopts a cross-sectional structure in which the rectangular portion 42 and the semi-circular portion 43 fit together. The rectangular portion 42 can provide a rigid positioning surface to ensure precise fit with the inner structure, while the semi-circular portion 43 is adapted to the arc-shaped groove wall to reduce assembly interference. The design that the long side and diameter of the two are equal in length and fit together makes the stress distribution more uniform, which can not only ensure the stability of the transmitted torque, but also improve the fitting accuracy with the positioning groove and enhance the overall positioning reliability.

[0042] In some embodiments, such as Figures 7-8 As shown, the inner corner of the rectangular part 42 is provided with a clearance surface 44. It should be noted that the clearance surface 44 at the inner corner of the rectangular part 42 is designed to avoid assembly interference between the positioning part 4 and the inner wall of the first positioning groove 27 and the second positioning groove 13, so that the positioning part 4 can be inserted into the groove more smoothly and the installation operation is simplified. At the same time, it reduces the stress concentration at the corner, avoids wear of the positioning part 4 due to friction or force after long-term use, extends its service life, and ensures the durability of positioning accuracy.

[0043] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0044] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A split-type gear scraper for machining gears, comprising a cutter body (1) and a cutter holder (2), characterized in that: The blade body (1) is coaxially sleeved on the blade holder (2). A root clearing (21) is provided at the central axis of the blade holder (2). A first reference surface (22) is formed at the circumferential edge of the upper end face of the blade holder (2). A retaining ring (23) protrudes upward at the connection between the first reference surface (22) and the root clearing (21). The outer wall surface of the retaining ring (23) is a second reference surface (24). The second reference surface (24) is inclined outward from top to bottom. The lower end face of the blade body (1) is attached to the first reference surface (22). The tool body (1) has a connecting through hole (11) at its central axis. The wall of the connecting through hole (11) is in close contact with the second reference surface (24). The first reference surface (22) has a plurality of first positioning holes (25). The first positioning holes (25) are evenly distributed around the central axis of the tool holder (2). The tool body (1) has a second positioning hole (12) corresponding to the first positioning hole (25). The first positioning hole (25) and the second positioning hole (12) are connected by a positioning bolt (3).

2. A split-type gear scraper for machining gears according to claim 1, characterized in that: An avoidance groove (26) is provided at the connection between the first reference surface (22) and the second reference surface (24).

3. A split-type gear scraper for machining gears according to claim 1, characterized in that: The tool holder (2) is made of steel.

4. A split-type gear scraper for machining gears according to claim 1, characterized in that: The first reference surface (22) is provided with a first positioning groove (27), and a positioning element (4) is adapted in the first positioning groove (27). The lower end face of the blade body (1) is provided with a second positioning groove (13) corresponding to the first positioning groove (27), and the upper end of the positioning element (4) is adapted in the second positioning groove (13).

5. A split-type gear scraper for machining gears according to claim 4, characterized in that: The positioning member (4) is provided with a first fixing hole (41), and the first positioning groove (27) is provided with a second fixing hole (28) that cooperates with the first fixing hole (41). The first fixing hole (41) and the second fixing hole (28) are connected by a fixing bolt (5).

6. A split-type gear scraper for machining gears according to claim 4, characterized in that: The horizontal cross-section of the positioning member (4) is composed of a rectangular part (42) and a semi-circular part (43). The rectangular part (42) is located inside the semi-circular part (43), and the length of the long side of the rectangular part (42) is equal to the diameter of the semi-circular part (43). The long side of the rectangular part (42) and the diameter of the semi-circular part (43) are fitted together.

7. A split-type gear scraper for machining gears according to claim 6, characterized in that: The rectangular portion (42) has a clearance cut surface (44) at the inner corner.

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