JP2683313B2 - Diamond dressing gear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diamond dressing gear, and more particularly, to a diamond dressing which has improved resistance to falling off of diamond abrasive grains adhered to the tooth tips to exert excellent dressing performance and its durability. It concerns gears.

[0002]

2. Description of the Related Art A diamond dressing gear is one of rotary dressers. For example, as shown in the sketch of FIG. 1, diamond abrasive grains 3 are fixed on the surface of a gear-shaped base metal 2 made of steel or the like with a plating layer as a support layer. Has been done. The diamond dressing gear 1 is used for polishing and shaping an internal gear-shaped grindstone 4 as shown in FIG. 2, and the tooth tip surface 1A of the dressing gear 1 polishes the tooth bottom portion 4A of the grindstone 4. Dressing is performed by polishing the tooth side wall portion 4B of the grindstone 4 by the tooth side wall surface 1B.

Looking at the grinding condition of the tooth portion during the dressing, for example, as shown in FIG. 3, the grinding depth (t) of the grindstone by the tooth tip surface 1A of the dressing gear 1 is as follows:
It is considerably larger than the grinding depth of the grindstone by B (t ′ = t · sin α), and the relative speed between the gear tooth tip surface 1A and the grindstone tooth bottom portion 4A when shaping and dressing the grindstone is the same as that of the gear tooth side wall surface 1B Since it is smaller than the relative speed with respect to the grindstone tooth side wall portion 4B, the polishing load applied to the tooth top surface 1A of the dressing gear 1 is considerably larger than the polishing load applied to the side wall surface 1B, and therefore the tooth top surface 1A is damaged early. .

Therefore, conventionally, for example, as shown in FIG. 4, a slit groove S is formed in advance on the surface corresponding to the tooth bottom of the grindstone 4 to be shaped and dressed to reduce the load applied to the tooth tip surface 1A of the dressing gear 1. Has been adopted.
However, as shaping and dressing of the grindstone progresses, the slit groove S will eventually disappear,
The load applied to the gear tooth tip surface 1A thereafter increases rapidly,
The diamond abrasive grains adhered to the tooth tip surface 1A fall off, which is the main cause of shortening the life of the diamond dressing gear.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and its purpose is to prevent the diamond abrasive grains fixed to the tooth tip surface of a diamond dressing gear from falling off. However, the present invention intends to provide a diamond dressing gear having an extended polishing / dressing life as a whole.

[0006]

In the structure of the diamond dressing gear according to the present invention, which can solve the above problems, diamond abrasive grains are fixed to the tooth crest surface and the tooth side wall surface with the plating layer as the supporting layer. In a gear-shaped diamond dressing gear, diamond abrasive grains having a larger particle size than the diamond abrasive grains fixed to the tooth side wall surface are fixed to the tooth tip surface, or the plating layer supporting the diamond abrasive grain on the tooth tip surface is The point is that diamond abrasive grains that are thicker than the plating layer on the side wall surface and have a larger grain size than the diamond abrasive particles that are fixed to the tooth side wall surface are fixed to the tooth tip surface. It is a thing.

[0007]

As described above, in the present invention, the particle size of the diamond abrasive grains fixed to the tooth tip surface of the diamond dressing gear is made larger than the particle size of the diamond abrasive grains fixed to the tooth side wall portion, Alternatively or additionally, a plating layer that supports the diamond abrasive grains on the tooth tip surface is formed to be thicker than the plating layer on the tooth side wall surface, thereby increasing the drop resistance of the diamond abrasive grains fixed to the tooth tip surface, It succeeded in extending the life of the entire diamond dressing gear. Hereinafter, the function and effect of each of the above constituent elements will be described in detail.

When the diamond dressing gear is used for shaping and dressing a grindstone, a large load acts on the tooth tip surface of the dressing gear to grind the root portion of the grindstone as described above. On the other hand, in order to improve the dressing accuracy by the dressing gear, for example, FIG.
As schematically shown in FIG. 1, the diamond abrasive grains 3 are projected to some extent from the plating layer 5 constituting the support layer to make the chip pocket C
It is necessary to secure p.

On the other hand, shaping using the dressing gear
When a gear wheel is ground with a dressing grindstone, a clearance is provided between the tooth bottom of the grindstone and the tooth tip of the gear to be ground in order to secure a clearance during the grinding. There is a need. Therefore, when grinding a gear using a grindstone dressed with a diamond dressing gear, the tooth bottom of the grindstone does not contact the tooth tip of the gear to be ground,
Therefore, what is most important for improving the grinding accuracy is how to finish the tooth side wall of the grindstone with high accuracy, and the dressing accuracy of the tooth bottom is not particularly important.

In other words, in the diamond dressing gear used for shaping and dressing a grindstone, the most important accuracy is the dressing accuracy of the tooth side wall surface, and no special accuracy is required for the tooth tip surface. ,
The point is that sufficient grinding efficiency should be secured.

From this point of view, therefore, a dressing gear is developed which can prevent the diamond abrasive grains from falling off on the tooth tip surface and improve the shaping and dressing efficiency of the grindstone while ensuring the dressing accuracy of the tooth side wall surface. As a result of various studies, the grain size of diamond abrasive grains fixed to the tooth tip surface of the dressing gear was increased, or the plating layer supporting the tooth tip surface was thickened as described above. I knew that if I did that, the purpose would be achieved wonderfully.

That is, in the first structure of the present invention, the particle diameter of the diamond abrasive grains fixed to the tooth tip surface of the dressing gear is made larger than the particle diameter of the diamond abrasive grains fixed to the tooth side wall surface. . Then, for example, the plating layer 5 for supporting the large-diameter diamond abrasive grains 3L can be thickened as schematically shown in FIG. 6, and compared with the example of FIG. 5 (diamond abrasive grains having a small particle diameter). It is possible to increase the embedding depth (L ': L'> L) of the abrasive grains 3 for ensuring the same degree of chip pockets (Cp), thereby enhancing the effect of fixing each diamond abrasive grain 3. Even if a large load is applied during shaping and dressing, the diamond abrasive grains 3 can be prevented from falling off as much as possible.

The method for fixing the diamond abrasive grains 3 having different grain sizes to the gear-shaped base metal 2 as described above is not particularly limited, but a general method is, for example, the following method.

That is, first, as shown in FIG. 7A, a masking agent M is applied to the tooth side wall surface 1B of the base metal 2, and diamond abrasive grains 3L having a large grain size are supplied to the tooth tip surface 1A, and then the plating method is applied. Thus, the plating layer 5L is grown to a predetermined thickness, and the large-diameter diamond abrasive grains 3L are fixed only to the tooth crest 1A. Then, as shown in FIG. 7B, the diamond abrasive grains 3L and the plating layer 5L fixed to the tooth top surface 1A are covered with a masking agent M, and the masking agent M covering the tooth side wall surface 1B is removed. Then, by supplying the diamond abrasive grains 3S having a small grain size to that portion, the plating layer 5S is grown to a predetermined thickness by the plating method, and finally, the masking agent M covering the tooth tip surface is removed. 7 (C)
As shown in Fig. 3, large-diameter diamond abrasive grains 3L adhere to the tooth tip surface 1A, and small-diameter diamond abrasive grains 3S adhere to the tooth side wall surface 1B.
A diamond dressing gear in which is adhered can be obtained.

In carrying out this method, if the plating layer for fixing the diamond abrasive grains 3L to the tooth tip surface is made thin, the small diameter diamond abrasive grains 3S are formed on the tooth side wall surface 1B as described above. It is also possible to omit masking of the tooth crest surface in the plating process when fixing.

The grain size of the diamond abrasive grains used at this time cannot be uniformly determined because it varies depending on the use and processing conditions, but if it is shown as a standard grain size, it is fixed to the tooth side wall surface. The particle size of the thing is 75-150
.mu.m, more generally about 100 to 150 .mu.m, the particle size of the particles fixed to the tooth tip surface is 125 to 450 .mu.m, more generally about 150 to 250 .mu.m, and the abrasive grain particles fixed to the tooth surface. The diameter is 1. of the abrasive grains fixed to the tooth side wall surface.
It is desirable to use a material having a particle size of about 2 to 2.0 times.

Further, the abrasive grains 3L having a large grain size are fixed so as to straddle the boundary portion between the tooth tip surface 1A and the tooth side wall surface 1B as shown in FIG. It is also possible to let.

[0018]

The present invention is configured as described above, and increases the grain size of diamond abrasive grains fixed to the tooth tip surface of the diamond dressing gear, or further supports the diamond abrasive grain on the tooth tip surface. By increasing the wall thickness of the plating layer, which is a layer, to prevent the diamond abrasive grains from falling off on the tooth crest surface, the diamond abrasive grains on the tooth crest surface are fixed without any loss of dressing accuracy on the tooth side wall surface. Since the adhesion force is increased, the life of the diamond dressing gear can be remarkably extended without the need for complicated pre-processing such as providing a slit groove on the grindstone.

[Brief description of the drawings]

FIG. 1 is a sketch drawing illustrating a diamond dressing gear.

[Fig. 2] Shaped by diamond dressing gear
It is a principal part cross-section explanatory drawing which illustrates the grindstone which is dressed.

FIG. 3 is an explanatory diagram showing a polishing depth of each tooth when dressing a grindstone using a diamond dressing gear.

FIG. 4 is an explanatory view showing an example of conventional grinding stone processing.

FIG. 5 is an enlarged partial cross-sectional explanatory view showing the state of adhesion of diamond abrasive grains on the tooth side wall surface.

FIG. 6 is an enlarged partial cross-sectional explanatory view illustrating the state of adhesion of diamond abrasive grains on the tooth crest surface.

FIG. 7 is an enlarged cross-sectional explanatory view of essential parts illustrating a method for manufacturing a diamond dressing gear according to the present invention.

FIG. 8 is an enlarged cross-sectional explanatory view of essential parts illustrating a diamond dressing gear according to the present invention.

[Explanation of symbols]

 1 Diamond Dressing Gear 1A Dressing Gear Tooth Tip Surface 1B Dressing Gear Tooth Side Wall Surface 2 Base Metal 3,3L, 3S Diamond Abrasive Grain 4 Grinding Stone 4A Grinding Stone Bottom 4B Grinding Stone Side Wall 5,5L, 5S Plating Layer M Masking Agent Cp Chip Pocket S slit groove

Claims (2)

(57) [Claims] 1. A gear-shaped diamond dressing gear in which diamond abrasive grains are fixed to a tooth tip surface and a tooth side wall surface with a plating layer as a support layer, and the particle size is larger than the diamond abrasive grain fixed to the tooth side wall surface. A diamond dressing gear characterized in that diamond abrasive grains are fixed to the tooth crest surface. To 2. A tooth crest and the tooth side walls, through the plating layer
Gear-shaped diamond to which diamond abrasive grains are fixed
In dressing gear, diamond abrasive grains on the tooth tip
The plating layer that supports is thicker than the plating layer on the tooth side wall surface
A diamond that is fixed to the tooth side wall surface
Diamond abrasive grains with a larger grain size than the abrasive grains
A diamond dressing gear characterized by being fixed .