Dresser

Abstract

To provide a dresser capable of efficiently processing a grinding wheel suitable for polishing a gear in which the thickness of a dedendum is secured.SOLUTION: A dresser that processes a grindstone that polishes a gear, the dresser comprising: a first processing curved surface and a second processing curved surface that respectively form a first curved surface and a second curved surface positioned in order from a tooth surface to a tooth tip surface of the grindstone, wherein a radius of curvature of the second processing curved surface is smaller than a radius of curvature of the first processing curved surface.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a dresser. [Background technology]

[0002] BACKGROUND ART A dresser for processing a grinding wheel for grinding a gear is known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-142927 Summary of the Invention [Problem to be solved by the invention]

[0004] Grinding gears to ensure the required thickness of the tooth base can improve the strength of the gears. Therefore, a dresser that can efficiently process grinding wheels suitable for such gears is desired.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a dresser capable of efficiently processing grinding wheels suitable for grinding gears with a sufficient thickness at the base of the teeth. [Means for solving the problem]

[0006] The above object can be achieved by a dresser for processing a grinding wheel for grinding a gear, the dresser comprising a first processed curved surface and a second processed curved surface that respectively form a first curved surface and a second curved surface positioned in order from the tooth surface to the tooth tip surface of the grinding wheel, and the radius of curvature of the second processed curved surface is smaller than the radius of curvature of the first processed curved surface. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a dresser that can efficiently process a grinding wheel suitable for grinding a gear having a sufficient thickness at the tooth base. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1A is an explanatory diagram of a dresser that processes a grinding wheel, and FIG. 1B is an enlarged view of a first processing curved surface and a second processing curved surface of the dresser. [Figure 2] FIG. 2A is an explanatory diagram of a gear tooth ground by a grinding wheel, and FIG. 2B is an enlarged view of the gear tooth flank. [Figure 3] FIG. 3A is an explanatory diagram of a dresser according to a first modified example, and FIG. 3B is an explanatory diagram of a dresser according to a second modified example. DETAILED DESCRIPTION OF THE INVENTION

[0009] 1A is an explanatory diagram of a dresser 10 that processes a grinding wheel 20. The dresser 10 is disk-shaped. Teeth 12, a first processing curved surface 15, and a second processing curved surface 16 are formed on the outer periphery of the dresser 10. The grinding wheel 20 is threaded. Helically extending teeth 22 are formed on the outer periphery of the grinding wheel 20. The teeth 22 have two tooth flanks 24 and a tooth tip surface 27.

[0010] The teeth 12 of the dresser 10 are arranged between adjacent teeth 22 along the central axis A of the grinding wheel 20. Each tooth 12 has a tooth surface 14 that contacts only one of two tooth surfaces 24 of one of the adjacent teeth 22. The first processing curved surface 15 and the second processing curved surface 16, which will be described in detail later, contact from one of the other two tooth surfaces 24 of the adjacent tooth 22 to the tooth tip surface 27. As described above, with the dresser 10 and the grinding wheel 20 in partial contact, the grinding wheel 20 rotates around the central axis A, and the teeth 22 of the grinding wheel 20 are machined by rotating around the central axis of the dresser 10, which is slightly inclined relative to the central axis A. Although not shown in FIG. 1A , the dresser 10 is a composite type in which the teeth 12, the first processing curved surface 15, and the second processing curved surface 16 have symmetrical portions with respect to a line perpendicular to the central axis of the dresser 10. For this reason, both of the two tooth flanks 24 of the tooth 22 are machined.

[0011] FIG. 1B is an enlarged view of the first machined curved surface 15 and the second machined curved surface 16 of the dresser 10. The first machined curved surface 15 is located closer to the tooth surface 24 than the second machined curved surface 16, and the second machined curved surface 16 is located closer to the tooth tip 27 than the first machined curved surface 15. Specifically, the first machined curved surface 15 and the second machined curved surface 16 are formed from the involute-required range shown in FIG. 1B to the root side of the tooth 12 of the dresser 10. The involute-required range is the range in which the outer diameter of the gear tooth ground by the grinding wheel 20 (described later) must be an involute curve. The first machined curved surface 15 and the second machined curved surface 16 are smoothly continuous so as to share a common tangent. The radius of curvature of the second machined curved surface 16 is smaller than that of the first machined curved surface 15. Furthermore, the length of the second machined curved surface 16 is shorter than that of the first machined curved surface 15. With this shape, a first curved surface 25 and a second curved surface 26 corresponding to the first curved surface 15 and the second curved surface 16, respectively, are formed from the tooth surface 24 to the tooth tip surface 27 of the tooth 22 of the grinding wheel 20. Therefore, like the first curved surface 15 and the second curved surface 16, the first curved surface 25 and the second curved surface 26 are smoothly continuous so as to have a common tangent, and the radius of curvature of the second curved surface 26 is smaller than the radius of curvature of the first curved surface 25.

[0012] FIG. 2A is an explanatory diagram of a tooth 32 of a gear 30 ground by a grinding wheel 20. FIG. 2B is an enlarged view of a tooth flank 35 of the gear 30. A thick tooth flank 35 is formed from the tooth flank 34 to the tooth root 37. As described above, the tooth flank 35 is formed closer to the tooth root 37 than the involute required range. The tooth flank 35 is a portion ground by the first curved surface 25 and the second curved surface 26 of the grinding wheel 20. FIG. 2B shows a tooth flank 35x of a comparative gear ground by a grinding wheel in which the tooth flank 24 and the tooth tip 27 extend linearly and are not formed with the first curved surface 25 and the second curved surface 26. Compared to the tooth flank 35x, the tooth flank 35 is located outside the tooth flank 34. As described above, the tooth flank 35 is thicker than in the comparative example. The tooth flank 35 is smoothly and continuously curved, similar to the first curved surface 25, the second curved surface 26, and the first machined curved surface 15, the second machined curved surface 16. This ensures the strength of the teeth 32 of the gear 30. In this way, the dresser 10 of this embodiment can efficiently machine the grinding wheel 20 suitable for grinding the gear 30 with ensured strength.

[0013] 3A is an explanatory diagram of a dresser 10a according to a first modification. In the dresser 10a, a first processed curved surface 15 and a second processed curved surface 16 are formed continuously with the tooth flank 14. This type of dresser 10a can also efficiently process a grinding wheel 20 suitable for grinding a gear 30 with sufficient strength.

[0014] 3B is an explanatory diagram of a dresser 10b, which is a second modified example. In the dresser 10b, a first processed curved surface 15 is formed continuously with the tooth flank 14, and a second processed curved surface 16 is formed in the same position as in the dresser 10 shown in FIGS. 1A and 1B. In this way, the first processed curved surface 15 and the second processed curved surface 16 do not need to be continuous with each other, and may be provided separately in different locations.

[0015] In the above embodiment and modified examples, the dressers 10, 10a, and 10b are of a composite type, but they may also be of a single disk type.A dresser may have three or more processed curved surfaces.

[0016] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiments, and various modifications and variations are possible within the scope of the gist of the present invention as defined in the claims. [Explanation of symbols]

[0017] 10 Dresser 12 teeth 14 Tooth surface 15 1st machining curved surface 16 2nd machining curved surface 20 Grindstone 22 teeth 24 Tooth surface 25 1st surface 26 Second surface 27 Tooth tip 30 Gears 34 Tooth surface 35 Tooth flank 37 Bottom surface

Claims

[Claim 1] A dresser for processing a grinding wheel for grinding a gear, a first curved surface and a second curved surface that respectively form a first curved surface and a second curved surface that are positioned in order from the tooth surface to the tooth tip surface of the grinding wheel; A dresser, wherein the radius of curvature of the second processed curved surface is smaller than the radius of curvature of the first processed curved surface.

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