Method for forming gear forming grinding wheel

Abstract

To provide a method for forming a gear forming grinding wheel having a great gear engagement noise suppressing effect.SOLUTION: A method of forming a gear-forming grinding wheel (3) according to an embodiment of the present disclosure includes the steps of: rotating a grinding wheel substrate (6) at a low speed to form teeth (6a) of the grinding wheel substrate (6); rotating the grinding wheel substrate (6) formed with the teeth (6a) at a high speed and detecting an amount and phase of rotational run-out caused by dynamic vibration generated by mass-unbalance of the grinding wheel substrate (6); and rotating the grinding wheel substrate (6) formed with the teeth (6a), and reforming the teeth (6a) of the grinding wheel substrate (6) on the basis of the amount of rotational run out, and the phase, so that, even if the phase of the grinding wheel substrate (6) varies at machining points where the teeth (6a) of the grinding wheel substrate (6) cut into teeth (2a) of a gear (2), the grinding wheel substrate (6) rotates at the high speed and the teeth (6a) of the grinding wheel substrate (6) cut into the teeth (2a) of the gear (2) by a constant cutting amount.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a method for forming a gear forming wheel. [Background technology]

[0002] For example, the gear forming method in Patent Document 1 attempts to reduce gear meshing noise by continuously changing the feed speed of the gear forming grindstone when forming the gear teeth with the gear forming grindstone, thereby making the fine scratches on the gear teeth irregular. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-335061 A Summary of the Invention [Problem to be solved by the invention]

[0004] The present applicant has found the following problem: The gear forming method of Patent Document 1 has a problem in that it has little effect in suppressing gear meshing noise because it does not take into consideration run-out of the gear forming grindstone during actual processing.

[0005] The present disclosure has been made in consideration of such problems, and provides a method for forming a gear forming grindstone that is highly effective in suppressing gear meshing noise. [Means for solving the problem]

[0006] A method for forming a gear forming grindstone according to one aspect of the present disclosure is a method for forming a gear forming grindstone, comprising the steps of: rotating the grindstone substrate at a low speed to form teeth on the grindstone substrate; a step of rotating the grindstone substrate on which the teeth are formed at a high speed and detecting the amount and phase of rotational runout caused by dynamic vibrations generated by mass imbalance of the grindstone substrate; a step of rotating the grindstone substrate on which the teeth have been formed, and reforming the teeth of the grindstone substrate based on the amount of rotational runout and the phase so that even if the phase of the grindstone substrate changes at a processing point where the teeth of the grindstone substrate cut into the gear teeth, the grindstone substrate rotates at a high speed and the amount of cut in by the teeth of the grindstone substrate into the gear teeth is constant; Equipped with. Effect of the Invention

[0007] According to the present disclosure, it is possible to realize a method for forming a gear forming grindstone that is highly effective in suppressing gear meshing noise. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view showing a gear forming apparatus in which a method for forming a gear grinding wheel according to an embodiment of the present invention is carried out. [Diagram 2] FIG. 1A is a diagram explaining the rotational runout of the grinding wheel substrate, FIG. 1B is a diagram showing the relationship between the amount of cut and the phase of the grinding wheel substrate when the grinding wheel substrate is rotated at high speed, and FIG. 1C is a diagram showing how the teeth of the grinding wheel substrate are reshaped based on the detected amount of rotational runout and phase. [Diagram 3] FIG. 2 is a diagram showing a tooth surface when a gear tooth is formed using a gear forming grindstone. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, specific embodiments to which the present disclosure is applied will be described in detail with reference to the drawings. However, the present disclosure is not limited to the following embodiments. In addition, the following description and drawings are appropriately simplified for clarity of explanation.

[0010] First, a configuration of a gear forming apparatus in which the gear forming grindstone forming method of the present embodiment (hereinafter, sometimes simply referred to as the forming method) is performed will be briefly described. Fig. 1 is a perspective view showing a gear forming apparatus in which the forming method of the present embodiment is performed. Here, in the following description, for clarity, three-dimensional (XYZ) coordinates may be used for explanation.

[0011] As shown in FIG. 1, the gear forming device 1 is configured to shape (e.g., grind) the tooth surfaces of the teeth 2a of a gear 2 by contacting the tooth surfaces of the teeth 2a of a gear 2, which is supported rotatably around the Z axis, with the teeth 3a of a gear forming grindstone 3, which is supported movably in the X-axis, Y-axis, and Z-axis directions, as the gear forming grindstone 3 rotates around the Y axis.

[0012] At this time, the gear molding device 1, as shown in FIG. 1, is equipped with an auto-balancing device 4 capable of detecting the amount and phase of rotational runout caused by dynamic vibrations generated when the gear molding grinding wheel 3 rotates, and a dressing device 5 for forming the teeth 3a of the gear molding grinding wheel 3.

[0013] Next, the flow of the forming method of this embodiment will be described. Here, Fig. 2(a) shows a diagram explaining the rotational runout of the grindstone substrate on the left side, and a diagram explaining the rotational runout of the grindstone substrate when the grindstone substrate is rotated at a low speed and when the grindstone substrate is rotated at a high speed on the right side. Fig. 2(b) is a diagram showing the relationship between the cutting amount and phase of the grindstone substrate when the grindstone substrate is rotated at a high speed. Fig. 2(c) is a diagram showing the state in which the teeth of the grindstone substrate are reshaped based on the detected rotational runout amount and phase.

[0014] First, the grindstone substrate 6 is rotated around the Y axis at a low speed (for example, a rotation speed generally used when the grindstone substrate 6 is subjected to a dressing process), and the teeth 6a of the grindstone substrate 6 are formed by the dressing device 5. The grindstone substrate 6 is, for example, a gear forming grindstone having teeth 6a formed helically on the peripheral surface of a substantially cylindrical grindstone before being subjected to a dressing process. Here, the teeth 6a of the grindstone substrate 6 may be either a single-row or multiple-row.

[0015] Next, the grindstone substrate 6 is rotated around the Y axis at high speed (for example, the rotational speed when the teeth 2a of the gear 2 are formed by the teeth 3a of the gear forming grindstone 3), and the amount of rotational runout and phase are detected by the auto-balancing device 4.

[0016] At this time, as shown in FIG. 2(a), due to dynamic vibrations caused by mass imbalance of the grinding wheel substrate 6, the center of rotation C1 of the grinding wheel substrate 6 when the grinding wheel substrate 6 is rotated at high speed experiences rotational runout relative to the center of rotation C2 of the grinding wheel substrate 6 when the grinding wheel substrate 6 is rotated at low speed.

[0017] As shown in FIG. 2(b), at the processing point where the tooth 6a of the grinding wheel substrate 6 cuts into the tooth 2a of the gear 2, the amount of cutting into the tooth 2a of the gear 2 by the tooth 6a of the grinding wheel substrate 6 in phase A shown in FIG. 2(a) is greater by a difference a than the amount of cutting into the tooth 2a of the gear 2 by the tooth 6a of the grinding wheel substrate 6 in phase B shown in FIG. 2(a).

[0018] Therefore, the grinding wheel substrate 6 is rotated around the Y axis (e.g., rotated at a low speed), and based on the amount of rotational runout and phase detected by the auto-balancing device 4, as shown in Figure 2(c), the teeth 6a of the grinding wheel substrate 6 are reshaped by the dressing device 5 so that even if the phase of the grinding wheel substrate 6 changes when the grinding wheel substrate 6 rotates at high speed at that processing point, that is, during one rotation of the grinding wheel substrate 6 at high speed, the amount of cutting by which the teeth 6a of the grinding wheel substrate 6 cut into the teeth 2a of the gear 2 at phase B (e.g., the amount of cutting at the phase with the smallest amount of cutting) does not change substantially.

[0019] That is, the teeth 6a of the grindstone substrate 6 are reshaped by moving the dressing device 5 along the waveform shown in Fig. 2(b). This makes it possible to shape the gear forming grindstone 3. If the teeth 6a of the grindstone substrate 6 have multiple teeth, it is advisable to carry out the above-mentioned process for each tooth.

[0020] Here, Fig. 3 shows, on the left side, the tooth surface of the gear teeth formed using a gear forming grindstone whose teeth have been formed by the forming method of this embodiment, and, on the right side, the tooth surface of the gear teeth formed using a gear forming grindstone whose teeth have been formed by a general dressing process. Here, in Fig. 3, the gear teeth are shown by hatching.

[0021] In this way, in the forming method of this embodiment, in order to take into account the runout of the gear forming grinding wheel 3 during actual processing, the teeth 6a of the grinding wheel substrate 6 are reshaped based on the amount of rotational runout and phase of the grinding wheel substrate 6 when the grinding wheel substrate 6 is rotated at high speed, so that even if the phase of the grinding wheel substrate 6 changes at the processing point, the amount of cut by the teeth 6a of the grinding wheel substrate 6 into the teeth 2a of the gear 2 does not change substantially.

[0022] Therefore, as shown in FIG. 3, the tooth surface of the gear 2a of the gear 2 is formed using the gear forming grindstone 3 in which the teeth 3a are formed by the forming method of this embodiment, compared to the tooth surface of the gear 2a formed using the gear forming grindstone in which the teeth are formed by a general dressing process.

[0023] As a result, the meshing noise of the gear 2 whose teeth 2a are formed using the gear forming grindstone 3 whose teeth 3a are formed using the forming method of this embodiment can be suppressed compared to the meshing noise of the gear whose teeth are formed using the gear forming grindstone whose teeth are formed by a general dressing process. In other words, the forming method of this embodiment is highly effective in suppressing the meshing noise of the gear 2.

[0024] The present disclosure is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit and scope of the present disclosure. [Explanation of symbols]

[0025] 1 Gear forming equipment 2 gears, 2a teeth 3 Gear forming wheel, 3a teeth 4. Auto-balancing device 5 Dressing device 6 Grindstone substrate, 6a teeth

Claims

[Claim 1] A method for forming a gear forming grindstone, comprising the steps of: rotating the grindstone substrate at a low speed to form teeth on the grindstone substrate; a step of rotating the grindstone substrate on which the teeth are formed at a high speed and detecting the amount and phase of rotational runout caused by dynamic vibrations generated by mass imbalance of the grindstone substrate; a step of rotating the grindstone substrate on which the teeth have been formed, and reforming the teeth of the grindstone substrate based on the amount of rotational runout and the phase so that even if the phase of the grindstone substrate changes at a processing point where the teeth of the grindstone substrate cut into the gear teeth, the grindstone substrate rotates at a high speed and the amount of cut in by the teeth of the grindstone substrate into the gear teeth is constant; A method for forming a gear grinding wheel comprising the steps of:

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