Hobbing tool capable of improving stability
By introducing a positioning sleeve structure in the hobbing processing, the contact area with the gear is increased, the problem of insufficient clamping force of the spring chuck is solved, and more stable gear processing is achieved and tool life is extended.
Patent Information
- Application Number
- CN202422169627.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-03
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-09-03
AI Technical Summary
In the existing gear processing, insufficient clamping force of the spring chuck leads to unstable processing, resulting in displacement and vibration, affecting gear accuracy and tool life.
In the hobbing process, the positioning sleeve structure is introduced, and is connected to the spring chuck by bolts or threads, increasing the contact area with the gear, providing additional support and positioning, and resisting axial cutting forces.
Improves the stability of gear processing, reduces vibration and offset, improves gear surface quality and tool life, and reduces production costs.
Smart Images
Figure CN223083934U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of gear processing and relates to a hobbing tooling for improving stability. Background Technique
[0002] As an important component in mechanical transmission, the machining accuracy and surface quality of gears directly affect the operating efficiency and service life of the entire mechanical system. In the process of gear machining, hobbing is a widely used gear cutting method, which has the advantages of high machining efficiency and wide application range. However, the quality of hobbing not only depends on the performance of the hobbing tool, but also is closely related to the clamping method of the gear.
[0003] At present, most gear machining uses a collet chuck for clamping. The collet chuck clamps the gear to be machined through elastic deformation, and has the advantages of simple operation and wide application range. However, due to the structural characteristics of the collet chuck itself, there are the following deficiencies in the hobbing process:
[0004] 1. Insufficient clamping force leads to unstable machining: During the hobbing process, the axial cutting force acts on the gear. Due to the limited clamping force of the collet chuck, especially when machining large-diameter or long-axis gears, the gear is prone to displacement or loosening due to insufficient rigidity. This situation will cause unstable machining, resulting in an increase in the tooth profile error of the gear, and even may lead to the scrapping of the gear.
[0005] 2. Surface quality problems caused by elastic vibration: The elastic deformation of the collet chuck will cause the gear to be machined to generate slight vibrations under the action of the cutting force to a certain extent. This vibration is likely to form feed marks on the machined surface of the gear, affecting the surface roughness and overall accuracy of the gear, and reducing the service performance of the gear.
[0006] 3. Affect the tool life: Due to the insufficient rigidity of the elastic chuck, the gear is prone to slight offset and vibration during machining. This not only affects the machining quality, but also causes the hobbing tool to be subjected to uneven forces, thereby accelerating the wear of the tool, shortening its service life, and increasing the production cost. Content of the Utility Model
[0007] In view of this, the purpose of the present utility model is to solve the above problems and provide a hobbing tooling for improving stability.
[0008] To achieve the above purpose, the present utility model provides the following technical solutions:
[0009] A hobbing tooling for improving stability, comprising a spring chuck and a positioning sleeve; one end of the spring chuck is connected to the main shaft of the hobbing machine, and the other end abuts against the center point of the hobbing machine; the gear to be machined is sleeved on the spring chuck and fixed under the elastic expansion of the spring chuck; the positioning sleeve is arranged below the gear to be machined, one end abuts against the gear to be machined, and the other end abuts against the spring chuck to support and position the gear to be machined.
[0010] Further, the positioning sleeve is sleeved on the spring chuck and connected to the spring chuck by bolt or thread fit.
[0011] Further, the outer diameter of the positioning sleeve is stepped, and the large end is the end in contact with the gear to be machined.
[0012] Further, the outer diameter of the large end of the positioning sleeve is 1-2 mm smaller than the root circle diameter of the gear to be machined.
[0013] The beneficial effects of the present utility model are as follows:
[0014] 1. By introducing the positioning sleeve structure, the gear to be machined can be more stably supported during the machining process. The positioning sleeve is in close contact with the end face of the gear to be machined, and effectively resists the axial cutting force during machining relying on the stability of the main shaft, avoiding the displacement or loosening of the gear under the action of the cutting force, and greatly improving the machining stability.
[0015] 2. In the present utility model, due to the extensive contact between the positioning sleeve and the gear end face, the micro-vibrations that may occur during the machining of the gear are reduced, thereby effectively avoiding the feed vibration marks caused by the vibrations. This improvement significantly improves the surface quality of the gear, effectively controls the tooth profile error and surface roughness, and ensures the machining requirements of high-precision gears.
[0016] 3. The tooling design of the present utility model effectively reduces the offset and vibration phenomena during gear machining, so that the force on the hobbing tool during cutting is more uniform. This not only reduces the load on the tool, reduces the tool wear caused by uneven force, but also extends the service life of the tool and reduces the production cost.
[0017] Other advantages, objectives and features of the present utility model will be described to some extent in the subsequent description, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present utility model. The objectives and other advantages of the present utility model can be realized and obtained through the following description. Brief Description of the Drawings
[0018] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the following will provide a preferred and detailed description of the present utility model in conjunction with the accompanying drawings, where:
[0019] Figure 1 It is a schematic structural diagram of a hobbing tooling for improving stability in the present utility model.
[0020] Reference numerals: 1 - center; 2 - gear to be machined; 3 - positioning sleeve; 4 - collet chuck; 5 - spindle. Specific embodiments
[0021] The following uses specific specific examples to illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model. It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present utility model in a schematic manner. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.
[0022] Among them, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to the present utility model; in order to better illustrate the embodiments of the present utility model, some components in the accompanying drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.
[0023] In the accompanying drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying 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. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and should not be construed as a limitation to the present utility model. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.
[0024] Please refer to Figure 1, it is a hobbing tooling for improving stability, including a spring collet 4 and a positioning sleeve 3; one end of the spring collet 4 is fixedly installed on the main shaft 5 of the hobbing machine through bolts, and the other end abuts against the center point 1 of the hobbing machine. The gear 2 to be machined is sleeved on the spring collet 4 and is fixed under the elastic expansion action of the spring collet 4; the positioning sleeve 3 is installed below the gear 2 to be machined, one end abuts against the gear 2 to be machined, and the other end abuts against the spring collet 4 to support and position the gear 2 to be machined.
[0025] The spring collet 4 in this embodiment is a mature prior art. It realizes the expansion of the expansion core through the pressure of the center point 1, thereby fixing the gear 2 to be machined. The positioning sleeve 3 is sleeved on the spring collet 4 and is connected to the spring collet 4 through bolts or threaded fit.
[0026] The outer diameter of the positioning sleeve 3 is stepped, and the large end is the end in contact with the gear 2 to be machined. The outer diameter of the large end of the positioning sleeve 3 is 1-2 mm smaller than the root circle diameter of the gear 2 to be machined.
[0027] In this embodiment, the contact area between the positioning tooling and the product positioning surface is increased through the positioning sleeve 3, and the processing stability is improved. The shape and hole size of this positioning sleeve are adjusted according to the sizes of the spring collet 4, the spindle seat, and the product end face, and its structure and principle remain unchanged. It can be widely applied to various machining operations such as tooth profile machining and turning machining that use the one-clamp-one-center method for clamping and have axial feed.
[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.
Claims
1. A hobbing tooling for improving stability, characterized in that: It includes a spring collet and a positioning sleeve; one end of the spring collet is connected to the main shaft of the hobbing machine, and the other end abuts against the center of the hobbing machine; the gear to be machined is sleeved on the spring collet and fixed under the elastic expansion of the spring collet; the positioning sleeve is arranged below the gear to be machined, one end abuts against the gear to be machined, and the other end abuts against the spring collet to support and position the gear to be machined.
2. The hobbing tooling for improving stability according to claim 1, wherein: The positioning sleeve is sleeved on the spring collet and is connected to the spring collet by bolts or threaded fit.
3. The hobbing tooling for improving stability according to claim 2, wherein: The outer diameter of the positioning sleeve is stepped, and the large end is the end in contact with the gear to be machined.
4. The hobbing tooling for improving stability according to claim 3, characterized in that: The outer diameter of the large end of the positioning sleeve is 1-2 mm smaller than the dedendum circle diameter of the gear to be machined.