Variable-inclination insert gear dry-cutting hob

Abstract

The application discloses a variable rake angle insert gear dry cutting hob, which is characterized by comprising a cutter shaft and a plurality of inserts, the outer surface of the cutter shaft is provided with a spiral body for insert installation in the circumferential direction, and the plurality of inserts are detachably inserted into the spiral body; the inserts are provided with a rake face and a relief face, and the rake face and the relief face are both twisted to make the rake angle of the cutting edge unequal everywhere; the inclination of the tooth profile in gear machining can be reduced, the strength of the gear tooth is enhanced, the problems of uneven cutting wear in hobbing machining and poor contact of the gear tooth with a small spiral angle after hobbing machining are solved, gear meshing precision is improved, and in addition, the overall cost of the hob can be reduced by adopting the insert structure, the detachable connection mode is beneficial to the individual replacement of the worn inserts, and the whole hob is not scrapped.

Description

Technical Field

[0001] This invention belongs to the field of gear machining tool technology, specifically relating to a dry cutting hob for variable rake angle insert gears. Background Technology

[0002] Gear hobbing is the most widely used gear machining method, characterized by high machining efficiency, good versatility, and high motion accuracy. However, the rake angle of a traditional hob is constant. During gear machining, the cutting plane constantly changes with the relative movement between the hob and the gear, causing the tooth profile to tilt circumferentially. This leads to uneven contact during gear meshing, accelerating gear wear, especially noticeable in dry cutting environments. Furthermore, in heavy-load environments, gears need to be thickened to meet strength requirements. However, as the tooth thickness increases, the tilt of the tooth profile in the tooth width direction becomes more pronounced, resulting in lower gear meshing accuracy and potentially causing safety accidents.

[0003] Therefore, there is an urgent need to develop a variable rake angle gear machining tool to reduce the inclination of the tooth profile. This will not only increase the strength of the gear teeth, but also improve the problem of uneven cutting wear in gear machining, thereby improving the gear accuracy. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a variable rake angle insert gear dry cutting hob, which reduces the inclination of the tooth profile during gear machining, increases the strength of the gear teeth, improves the problem of uneven cutting wear during gear machining, and thus improves the accuracy of the gear.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a variable rake angle insert gear dry cutting hob, comprising a cutter shaft and multiple blades, wherein the outer surface of the cutter shaft is provided with a helical body for mounting the blades along the circumferential direction, and the multiple blades are detachably inserted into the helical body; the blades have a front cutting face and a rear cutting face, both of which are twisted so that the rake angle of the cutting edge is not equal at all points along the cutting edge length.

[0006] Furthermore, the multiple blades are divided into multiple pairs and are equally spaced on the spiral body, and the two blades in the same pair are respectively located on the two sides of the spiral body along the axial direction of the blade shaft.

[0007] Furthermore, the two blades in the same pair of blades are staggered on the helical body.

[0008] Furthermore, the blade's length direction is arranged at a certain angle to the radial direction of the blade shaft.

[0009] Furthermore, the spiral body is provided with a blade mounting groove for positioning and installing the blade.

[0010] Furthermore, the blade is fastened to the blade mounting slot by screws.

[0011] Furthermore, the top surface of the blade is provided with a countersunk hole for screw installation, and the bottom of the blade mounting groove is provided with a threaded hole.

[0012] Furthermore, the spiral body is provided with a chip-receiving groove corresponding to the rake face of the blade.

[0013] Furthermore, the chip groove does not penetrate the helical body along the axial direction of the cutter shaft.

[0014] Furthermore, the spiral body and the cutter shaft are an integral structure.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] The variable rake angle insert gear dry cutting hob provided by this invention designs the rake and flank faces of the insert into a twisted structure, which makes the rake angle at the intersection of the rake and flank faces different at various points on the cutting edge. This reduces the inclination of the tooth profile during gear machining, enhances the strength of the gear teeth, and solves the problems of uneven cutting wear and poor contact during gear meshing caused by a small helix angle after hobbing. This improves the gear meshing accuracy. In addition, the insert structure of this invention reduces the overall cost of the hob, and the detachable connection method facilitates the individual replacement of worn inserts, preventing the entire hob from being scrapped.

[0017] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the explosion structure of some blades after they explode.

[0019] Figure 2 This is a top view of the structure of the present invention.

[0020] Figure 3 This is a schematic diagram of the axial structure of the blade of the present invention.

[0021] Reference numerals: 1-cutter shaft; 101-helix; 102-insert mounting groove; 103-threaded hole; 104-chip groove; 2-insert; 201-rake face; 202-flank face; 203-counterhead; 204-cutting edge. Detailed Implementation

[0022] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only for illustrating the basic concept of the present invention; in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0023] Please see Figure 1-3 A variable rake angle insert gear dry cutting hob includes a cutter shaft 1 and multiple blades 2. The outer surface of the cutter shaft 1 is provided with a helical body 101 for mounting the blades 2 along the circumferential direction. The multiple blades 2 are detachably inserted into the helical body 101. Here, the blades 2 are generally made of different materials than the cutter shaft 1 and the helical body 101, usually using cemented carbide. The insert structure can reduce the manufacturing cost of the overall structure. The detachable connection method facilitates the individual replacement of worn blades, preventing the entire hob from being scrapped.

[0024] The cutting tool 2 has a rake face 201 and a flank face 202, both of which are twisted so that the rake angle of the cutting edge 204 is not equal at all points along its length. This structural design can reduce the inclination of the tooth profile during gear machining, enhance the strength of the gear teeth, and solve the problems of uneven cutting wear and poor contact during gear meshing caused by a small helix angle in the gear teeth after hobbing, thereby improving the gear meshing accuracy.

[0025] In this embodiment, the multiple blades 2 are divided into multiple pairs and are equally spaced on the spiral body 101. Specifically, the multiple pairs of blades are equally spaced along the spiral direction of the spiral body 101, which helps to improve processing efficiency and ensure relatively stable force during cutting. Moreover, the two blades in the same pair are respectively located on both sides of the spiral body 101 along the axial direction of the cutter shaft 1. This structural design is conducive to machining a tooth profile with a certain tooth width, which can significantly improve the hobbing productivity.

[0026] In this embodiment, the two blades in the same pair of blades 2 are staggered on the helical body. The staggered arrangement here refers to the asymmetrical distribution of the two blades on both sides of the helical body 101. This structural design helps to reduce cutting force, reduce impact on the blades 2, and improve the service life of the blades 2.

[0027] In this embodiment, the blade's length direction forms a certain angle with the radial direction of the blade shaft. (See [reference]). Figure 2Angle A in the cutter is generally preferred to be 1 to 15 degrees. This structural design facilitates the formation of a positive rake angle in the insert, which reduces chip deformation and friction generated when the chip flows over the rake face during gear cutting. This reduces the cutting force, lowers the cutting temperature, and extends the tool life. In addition, it has high productivity and low tooth surface roughness, making it suitable for finishing and semi-finishing of gears.

[0028] In this embodiment, the spiral body 101 is provided with a blade mounting groove 102 for positioning and installing the blade 2. This structural design allows the blade 2 to be quickly positioned and installed by the blade mounting groove 102 at the arrangement angle of the spiral body 101, thereby improving the installation accuracy of the blade and thus improving the machining accuracy.

[0029] In this embodiment, the blade 2 is fastened to the blade mounting groove 102 by screws (not shown in the figure). The screws are used for fastening, which, combined with the blade mounting groove 102, can improve the installation stability of the blade. At the same time, the structure is simple and easy to disassemble and assemble.

[0030] In this embodiment, the top surface of the blade 2 is provided with a countersunk hole 203 for screw installation, and the bottom of the blade mounting groove 102 is provided with a threaded hole 104. This structure is simple and the installation is stable.

[0031] In this embodiment, a chip groove 104 is provided on the spiral body 101 corresponding to the rake face 201 of the blade 2. The chip groove 104 is designed to facilitate the smooth discharge of chips generated during the machining process.

[0032] In this embodiment, the chip groove 104 does not penetrate the spiral body 101 along the axial direction of the cutter shaft 1; this structural design helps to improve the overall structural strength.

[0033] In this embodiment, the spiral body 101 and the cutter shaft 1 are an integral structure; this structural design facilitates processing and ensures the structural strength of the main body.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A dry-cutting hob with variable rake angle insert gears, characterized in that: The device includes a cutter shaft and multiple blades. The outer surface of the cutter shaft is provided with a spiral body for mounting the blades along the circumferential direction. The multiple blades are detachably embedded in the spiral body. Each blade has a front face and a rear face, both of which are twisted so that the rake angle of the cutting edge is not equal at all points along the cutting edge length. The multiple blades are divided into multiple pairs and are equally spaced on the spiral body, and the two blades in the same pair are respectively located on the two sides of the spiral body along the axial direction of the blade shaft. The blade is arranged at a certain angle to the radial direction of the blade shaft along its length, and the angle ranges from 1 to 15 degrees.

2. The variable rake angle insert gear dry cutting hob according to claim 1, characterized in that: The two blades in the same pair of blades are staggered on the helical body.

3. The variable rake angle insert gear dry cutting hob according to claim 1, characterized in that: The spiral body is provided with a blade mounting groove for positioning and installing the blade.

4. The variable rake angle insert gear dry cutting hob according to claim 3, characterized in that: The blade is fastened to the blade mounting slot by screws.

5. The variable rake angle insert gear dry cutting hob according to claim 4, characterized in that: The top surface of the blade is provided with a countersunk hole for screw installation, and the bottom of the blade mounting groove is provided with a threaded hole.

6. The variable rake angle insert gear dry cutting hob according to claim 1, characterized in that: The spiral body is provided with a chip groove corresponding to the rake face of the blade.

7. The variable rake angle insert gear dry cutting hob according to claim 6, characterized in that: The chip groove does not penetrate the helical body along the axial direction of the cutter shaft.

8. The variable rake angle insert gear dry cutting hob according to claim 1, characterized in that: The spiral body and the cutter shaft are an integral structure.

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