JP2003094247A - Method for machining gear flank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a gear of which the profile has no dispersion even if there is some dispersion among profiles of respective teeth of a grinding wheel, in a method for grinding flanks of a workpiece by turning a toothed workpiece due to engagement with a toothed grinding wheel and reciprocating the grinding wheel relative to the workpiece in the axial direction. SOLUTION: When the number of rotation of the internal gear workpiece 2 (or the internal toothed grinding wheel) has become some integer times of the number of teeth of the external toothed grinding wheel 3 (or the external gear workpiece), machining of the workpiece is finished. Accordingly, because the respective teeth of the workpiece come into contact with the respective teeth of the grinding wheel by the same number of times of grinding, a high precision product can be obtained without transferring the dispersion onto the workpiece even if there is some dispersion among profiles of respective teeth of the grinding wheel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing a tooth surface of a gear (gear), and particularly to a processing method used for finishing the tooth surface.

[0002]

2. Description of the Related Art As one of conventional gear tooth surface machining methods,
In the state where the teeth of the work (or grindstone) having the internal teeth and the teeth of the grindstone (or the work) having the outer teeth are engaged, either one is rotated and it is also moved back and forth in the axial direction to rotate both. Meanwhile, a method of polishing the tooth surface is known.

As one of the processing devices for carrying out this processing method, a work having inner teeth formed in a circular shape on the outer peripheral side and a gear shape on the inner peripheral side, and an outer shape formed on the outer peripheral side in a gear shape are used. After meshing with a grindstone with teeth, one of the grindstone and the work is rotated to rotate the other, and either one of the grindstone and the work reciprocates in the axial direction relative to the other. A grinding method for grinding the tooth surfaces of the internal teeth of a workpiece by
Further, at least two rollers, which are located on the outer peripheral side of the work and hold the work at the processing position by sandwiching the work with a grindstone located on the inner peripheral side of the work, and those rollers are respectively rotated. There is also known an internal tooth grinding device including a bearing that supports the bearing, a block that supports the bearing, and a roller support device that presses a workpiece against a grindstone through the block and the roller.

In the above-mentioned prior art, the tooth surface of the internal teeth (or external teeth) of the work is ground by reciprocally moving one of the engaged grindstone and the work in the axial direction relative to the other. However, when machining an internal tooth workpiece with an external tooth grindstone (the same applies when machining an external tooth workpiece with an internal tooth grindstone), the accuracy of the tooth profile of each tooth of the external tooth grindstone is Since some variation is unavoidable for manufacturing reasons, if the machining is completed without paying attention to the number of rotations of the internal tooth workpiece, the variation of the tooth profile of each tooth of the external tooth grindstone will be transferred to the workpiece. However, there is a problem that the tooth shape collapse may occur on the work, which deteriorates the performance of the product.

[0005]

SUMMARY OF THE INVENTION In view of the problems of the prior art as described above, the present invention rotates either one of a grindstone and a workpiece engaged with each other with respect to the other, and also relatively in the axial direction. In the grinding method of grinding the tooth surface of the internal tooth (or external tooth) of the work by reciprocating, the tooth shape collapse in the product due to manufacturing variations between the tooth profiles of each tooth of the grindstone. It is an object of the present invention to provide a novel gear tooth surface processing method capable of preventing the deterioration of product performance by preventing the generation thereof.

[0006]

In order to solve the above-mentioned problems, in the gear tooth surface machining method according to the first aspect of the present invention, either one of them is engaged after the external tooth grindstone is engaged with the internal tooth work. In the method of grinding the tooth surface of the internal tooth of the internal tooth work by rotating the other to rotate the other, and reciprocally moving one of them relative to the other in the axial direction, It is characterized in that the machining of the internal tooth work is finished when the number of rotations of the internal tooth work becomes an integral multiple of the number of teeth of the external tooth grindstone.

Further, in the gear tooth surface machining method of the second aspect, after the external tooth work is engaged with the internal tooth grindstone, one of them is rotationally driven to rotate the other together. , By reciprocating one of them axially relative to the other,
In the method of grinding the tooth surface of the external tooth of the external tooth work, the feature is that the machining of the external tooth work is terminated when the number of rotations of the internal tooth grindstone becomes an integer multiple of the number of teeth of the external tooth work. .

By adopting the above-mentioned means, each tooth of the work is brought into contact with all the teeth of the grindstone by the same number of times to be ground, so that variations in the tooth shape of the grindstone are transferred to the work. The work can be processed with high precision.

Therefore, even if there is a manufacturing variation between the tooth shapes of the teeth of the grindstone, it is prevented from being transferred to the work and causing the tooth shape collapse, so that the performance of the product is deteriorated. This problem can be solved.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view of a grindstone and a workpiece for explaining a gear tooth surface machining method according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a grindstone and a work, which are essential parts of a machining apparatus for implementing the gear tooth surface machining method of the first embodiment, and a machining method by their relative movement. Reference numeral 2 is an internal tooth work having an internal tooth formed in a circular shape on the outer peripheral side and a tooth shape on the inner peripheral side. 3 is
An outer tooth grindstone having outer teeth formed in a gear shape on the outer peripheral side.

As far as the above construction is concerned, the processing apparatus for carrying out the processing method of the embodiment is the same as the conventional processing apparatus,
The basic operation of those components is similar. That is,
The external tooth grindstone 3 is inserted into the internal tooth work 2 and relatively moved to a position where the tooth tips and the tooth bottoms are fitted to each other. While the teeth are meshing with each other, the external tooth grindstone 3 is rotated and reciprocally moved in the axial direction. As a result, the tooth surface of the workpiece 2 is ground and processed by the tooth surface of the grindstone 3.

Here, the following Table 1 shows examples of poor precision and good examples.
Explained by.

[0013]

[Table 1]

The uppermost number in Table 1 indicates the tooth number of the internal tooth work 2, and the number of internal teeth of the internal tooth work 2 is 17. Further, the external tooth grindstone 3 has 14 external teeth. Since the tooth numbers of the two are different, the tooth number of the external tooth grindstone 3 that meshes each time the internal tooth work 2 makes one revolution, so that tooth number is shown in the second and subsequent stages of Table 1. One turn of the internal tooth work 2 (1
Since the external tooth grindstone 3 must rotate by 17 teeth, the external tooth grindstone 3 rotates to the tooth number 3 at the first round of the internal tooth work 2 (at the end of the first rotation). To do. In the second round of the internal tooth work 2, the external tooth grindstone 3 starts to mesh with the tooth number 4 and ends at 6. Hereinafter, this is repeated.

Here, for example, the external tooth grindstone 3 is formed in a slightly elliptical shape, the tooth number 7 of the external tooth grindstone 3 is the highest, and the tooth number 1 is the lowest. If the number of rotations of the internal tooth work 2 is 10 laps, the tooth of the internal tooth work 2 with the tooth number 5 is the external tooth grindstone 3
Since the teeth of the tooth numbers 7, 10, 13, and 2 have not meshed with each other, a slight machining allowance is left. Since such a phenomenon can occur for all the teeth of the internal tooth work 2, the tooth shape collapse occurs in the internal tooth work 2.

On the other hand, in the present embodiment, the machining of the internal tooth work 2 is completed in 14 rounds, which is the same as the number of teeth of the external tooth grindstone 3. As a result, the external teeth of the internal tooth work 2 mesh with all the teeth of the external tooth grindstone 3 evenly, so that the shape collapse of the external tooth grindstone 3 is not directly transferred to the internal tooth work 2. Work can be processed with high precision.

The same effect can be obtained by processing the internal tooth workpiece 2 by 28.
It is obtained by terminating when the number of teeth of the external tooth grindstone 3 becomes an integral multiple, such as the circumference, 42 circumferences, and 56 circumferences.

In the above description, the relationship between the internal tooth work piece 2 and the external tooth grindstone 3 has been described. However, as in the gear tooth surface machining method 4 of the second embodiment whose essential parts are shown in FIG. 5
The same relationship is established when is the internal tooth and the work 6 is the external tooth. This is illustrated in Table 2 below.

[0019]

[Table 2]

For example, when the number of teeth of the internal tooth grindstone 4 is 19 and the number of teeth of the external tooth workpiece 6 is 16, by finishing the machining when the internal tooth grindstone 5 rotates by an integral multiple of 16 times, Since the shape of the grindstone is not directly transferred to the work, the work can be processed with high accuracy.

In the illustrated embodiment, the external tooth grindstone 3
Alternatively, the external tooth work 6 is rotationally driven and is reciprocally driven in the axial direction, but the internal tooth work 2 or the internal tooth grindstone 5 may be similarly driven, and the rotational drive and the reciprocal drive are shared by the grindstone and the work. It is also possible to let.

[Brief description of drawings]

FIG. 1 is a perspective view for explaining a gear tooth surface processing method that is an embodiment of the present invention.

FIG. 2 is a perspective view for explaining a gear tooth surface machining method according to another embodiment of the present invention.

[Explanation of symbols]

1 ... Gear tooth surface machining device (first embodiment) 2 ... Internal tooth work 3 ... External tooth grindstone 4 ... Gear tooth surface machining device (second embodiment) 5 ... Internal tooth grindstone 6 ... External tooth work

Claims (2)

[Claims] 1. An external tooth grindstone having external teeth formed in the outer gear shape on the outer peripheral side is meshed with an internal tooth workpiece having internal teeth formed in the inner gear shape on the inner peripheral side, While rotating one of the external tooth grindstone and the internal tooth work together to rotate the other, one of the external tooth grindstone and the internal tooth work is relatively axially relative to the other. In the method of grinding the tooth surface of the internal tooth of the internal tooth work by reciprocating, when the number of rotations of the internal tooth work is an integer multiple of the number of teeth of the external tooth grindstone, A method for machining a gear tooth surface, characterized by terminating the machining. 2. An external tooth workpiece having external teeth formed in the outer gear shape on the outer peripheral side is meshed with an internal tooth grindstone having inner teeth formed in the inner gear shape on the inner peripheral side, While rotating the other by rotating one of the internal tooth grindstone and the external tooth work, one of the internal tooth grindstone and the external tooth work is relatively axially relative to the other. By reciprocating, in the method of grinding the tooth surface of the external tooth of the external tooth work, when the number of rotations of the internal tooth grindstone is an integer multiple of the number of teeth of the external tooth work, of the external tooth work A method for machining a gear tooth surface, characterized by terminating the machining.