JPH0318096Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field The present invention is a finishing process to produce a highly accurate gear with a smooth tooth surface by modifying the tooth profile and lead of the tooth surface of a gear that has been made highly hard by heat treatment after gear cutting. This invention relates to a grinding device for gear finishing.

Conventional technology When manufacturing gears with a material hardness of around HRC60, generally heat treatment is applied after gear cutting to adjust the material hardness to the desired level, and finish grinding is performed after heat treatment to remove distortion and deformation that occurs in the gear. It is processed and finished into a high-precision gear.

In this finishing method, as shown in FIGS. 5 and 6, one gear-shaped grinding tool 31 and the gear to be ground 3 are
2 and 2 are meshed and rotated with an axis intersection angle and zero backlash, and each tooth 32a of the gear to be ground 32 is
Grinding tool 31 on opposing tooth surfaces 32b, 32b
Each cutting edge 31a moves along the path R by sliding motion Gf in the direction of the tooth profile and sliding motion G in the direction of the tooth trace, and grinds the tooth surface 32a of the gear to be ground 32 (in actual practice). Publication No. 102019 (Sho 58-102019).

Problems to be solved by the invention However, with the above structure, since the gear to be ground is ground with one grinding tool, if the abrasive grains attached to each tooth surface of each cutting edge of the grinding tool are large,
There is a problem that the tooth surface roughness of each tooth of the gear to be ground after grinding is too rough, and conversely, if the abrasive grains are small, the life of the grinding tool will be shortened.

One possible solution to this problem is to prepare two types of grinding tools with different sizes of abrasive grains and to exchange the grinding tools, but this has the disadvantage that exchanging the tools is complicated.

Therefore, the purpose of the present invention is to solve the above-mentioned problems by making it possible to vary the size of abrasive grains on each tooth surface of each tooth of a grinding tool with a simple operation, and to improve It is an object of the present invention to provide a gear finishing grinding device that can appropriately finish the roughness of each tooth surface of each tooth of the present invention, while effectively preventing shortening of the life of the grinding tool.

Means for Solving the Problems In order to achieve the above object, the present invention meshes a pair of grinding tools with a gear to be ground and rotates them in forward and reverse directions.
Grinding was performed by selectively bringing one of the two tooth surfaces of each cutting edge of each grinding tool having different abrasive grain sizes into contact with each tooth surface of each tooth of the gear to be ground.
That is, a first tooth-shaped grinding tool that meshes with the gear to be ground and a second gear-shaped grinding tool that meshes with the gear to be ground are disposed, and a drive member that drives the first grinding tool in forward and reverse rotation; and a braking member for controlling the rotation of the second grinding tool, the first grinding tool is driven to rotate in forward and reverse directions by the driving member, and the second grinding tool is driven to rotate via the gear to be ground. A gear finishing grinding device is provided in which a gear to be ground is ground by first and second grinding tools, and each tooth of the gear to be ground is removed from a pair of tooth surfaces of each cutting edge of the first grinding tool. The tooth surface that contacts one tooth surface of the gear to be ground is a surface with large abrasive grains, and the tooth surface that contacts the other tooth surface of each tooth of the gear to be ground is a surface with small abrasive grains, and the second grinding tool Of the pair of tooth surfaces of each cutting edge, the tooth surface that contacts the one tooth surface of each tooth of the gear to be ground is the surface with small abrasive grains, and the surface of the other tooth surface of each tooth of the gear to be ground is The tooth surface that comes into contact with the tooth surface is configured to have large abrasive grains.

Effects and Effects of the Invention According to the above configuration, the cutting edge of the grinding tool that grinds each tooth surface of each tooth of the gear to be ground can be sharpened by simply rotating the first grinding tool forward and backward without changing the grinding tool. The grain size can be easily changed, and the roughness of each tooth surface of each tooth of the gear to be ground can be efficiently and appropriately finished, effectively preventing shortening of the life of each grinding tool. can.

Example Examples of the present invention will be specifically described below.

The gear finishing grinding device according to this embodiment has a first
As shown in FIG. 2, a first gear-shaped grinding tool 1 that meshes with the gear to be ground 2 and a second gear-shaped grinding tool 3 that meshes with the gear to be ground 2 are arranged, and the first grinding tool 1 is Drive member 6 that rotates in reverse
and a braking member 7 for braking the rotation of the second grinding tool 3, the first grinding tool 1 is driven to rotate in forward and reverse directions by the drive member 6, and The gear to be ground 2 is ground by the first and second grinding tools 1 and 3 while the second grinding tool 3 is driven to rotate.

The first grinding tool 1 is driven to rotate in forward and reverse directions, and meshes with the gear to be ground 2 to rotate the gear to be ground 2 in forward and reverse directions. Each cutting edge 1 of this first grinding tool 1
One tooth surface 1b of a is the surface with large abrasive grains, and the first
Each tooth 2a of the gear to be ground 2 during forward rotation of the grinding tool 1
The other tooth surface 1c of each of the cutting edges 1a is a surface with small abrasive grains, so that when the first grinding tool 1 rotates in reverse, the gear to be ground 2
so that it can come into contact with the other tooth surface 2c of each tooth 2a.

Further, the second grinding tool 3 meshes with the gear to be ground 2 and applies a brake against forward and reverse rotation to make it difficult to rotate. Forced to rotate. One tooth surface 3b of each cutting edge 3a of this second grinding tool 3 is a surface with small abrasive grains, and comes into contact with one tooth surface 2b of each tooth 2a of the gear to be ground 2 when the first grinding tool 1 rotates in reverse. While each cutting edge 3
The other tooth surface 3c of a is the surface with large abrasive grains, and the first
Each tooth 2a of the gear to be ground 2 during forward rotation of the grinding tool 1
so that it can come into contact with the other tooth surface 2c.

As shown in FIG. 3, each of the cutting edges 1a, 3a of the grinding tools 1, 3 has abrasive grains on the entire tooth surface, as shown in FIG. The abrasive grains are made of high-hardness abrasive grains such as CBN abrasive grains and diamond abrasive grains, and the attachment method can be freely selected such as electrodeposition, resin bonding, or vitrified bonding.

In addition, in the meshing between the cutting edges 1a, 3a of the respective grinding tools 1, 3 and the teeth 2a of the gear to be ground 2, as shown in FIG. Or the other tooth surface 1c, 3b is the tooth 2
When contacting one tooth surface 2b or the other tooth surface 2c of the cutting edge 1a, 3a, the other tooth surface 1c, 3b of the cutting edge 1a, 3a
Alternatively, the pitch interval between each cutting edge 1a, 3a and the tooth 2a is determined so that one tooth surface 1b, 3c does not come into contact with the other tooth surface 2c or one tooth surface 2b of the tooth 2a.

According to the above configuration, as shown in FIG. 2a, the first grinding tool 1 is rotated forward in the direction a in the figure to cover one tooth surface 1b of each cutting edge 1a, that is, the tooth surface with large abrasive grains. One tooth surface 2b of each tooth 2a of the grinding gear 2 is brought into contact with the other tooth surface 2b in order, and the one tooth surface 2b is ground. When the gear to be ground 2 is rotated in the direction b in the figure by the first grinding tool 1, the other tooth surface 2C of each tooth 2a of the gear to be ground 2 is aligned with the other tooth of each cutting edge 3a of the second grinding tool 3. The second grinding tool 3, which is braked, is forcibly rotated in the direction c in the figure by sequentially contacting the surface 3c, that is, the tooth surface with large abrasive grains, and the other tooth surface 2c of each tooth 2a of the gear to be ground 2 is Grind sequentially.

Next, each cutting edge 1a, 3a of each grinding tool 1, 3
Gear 2 to be ground by surfaces 1b and 3c with large abrasive grains
When the grinding of both tooth surfaces 2b and 2c of each tooth 2a is completed, the first grinding tool 1 is cut as shown in FIG. 2b.
The other tooth surface 1c of each cutting edge 1a, that is, the tooth surface with small abrasive grains, is sequentially brought into contact with the other tooth surface 2c of each tooth 2a of the gear to be ground 2 by driving the other tooth surface 1c in the direction d in the figure. Grind the tooth surface 2c.

When the gear 2 to be ground is rotated in the direction e in the figure by the first grinding tool 1, one tooth surface 2b of each tooth 2a of the gear 2 to be ground is rotated by one of the cutting edges 3a of the second grinding tool 3. The second grinding tool 3, which is braked, is forcibly rotated in the direction f in the figure by sequentially contacting the tooth surfaces 3b, that is, the tooth surfaces with small abrasive grains, and one tooth surface of each tooth 2a of the gear to be ground 2. Grind 2b sequentially.

According to the above embodiment, first, the first grinding tool 1 is rotated in the forward direction, and the surfaces 1b and 3c of the cutting edges 1a and 3a of the first and second grinding tools 1 and 3 having large abrasive grains are used to rotate the gear to be ground. Since each tooth surface 2b, 2c of each tooth 2a of No. 2 is ground (roughly processed), it can be processed with very good cutting quality, and the tooth profile and lead of the gear can be corrected with high precision. 1 is reversely rotated to grind each tooth surface 2b, 2c of each tooth 2a of the gear to be ground 2 with the small abrasive surfaces 1c, 3b of each cutting edge 1a, 3a of the first and second grinding tools 1, 3. This makes it possible to easily change the size of the abrasive grains by simply changing the direction of rotation of the first grinding tool 1, and also allows each tooth 2a of the gear to be ground 2 to be finished smoothly.
The roughness of each tooth surface 2b, 2c can be appropriately finished, and shortening of the life of each grinding tool 1, 3 can be effectively prevented.

Note that the present invention is not limited to this embodiment, and can be implemented in various other forms. For example, as shown in FIG. 4, each tooth surface 1b, 1c, 3b, 3c of each cutting edge 1a, 3a of each grinding tool 1, 3
Assume that the abrasive grain attached parts 4 and the abrasive grain non-adhered parts 5 are arranged alternately along the tooth width direction, and each cutting edge is operated along the path R shown in FIG. 6 to form a chip plume. The grinding performance may be improved by increasing the size and sharpening the cutting edge.Also, tooth surfaces with abrasive grains adhered to the entire surface as shown in Fig. 3 and those shown in Fig. 4 above may be used. You can also use it as Further, each grinding tool may be in the form of a bevel gear to grind a bevel gear-shaped gear to be ground.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of a gear finishing grinding device according to an embodiment of the present invention, Figs. The figure is a perspective view of the cutting blade of each grinding tool, Figure 4 is a perspective view showing a modification of Figure 3, Figures 5 and 6 are an explanatory diagram of a conventional gear finishing grinding tool and the cutting blade of the grinding tool FIG. 3 is a perspective view of the teeth of the gear to be ground, showing the direction of movement of the gear. 1...First grinding tool, 1a, 3a...Cutting blade, 1
b, 1c, 3b, 3c... tooth surface, 2... gear to be ground, 2a... tooth, 2b, 2c... tooth surface, 3... second grinding tool, 4... abrasive grain attachment part, 5... ...Abrasive grain non-adhesion part, 6...Driving member, 7...Braking member.

Claims (1)

[Scope of Claim for Utility Model Registration] A first gear grinding tool that meshes with the gear to be ground and a second gear-shaped grinding tool that meshes with the gear to be ground are arranged, and the first grinding tool is driven to rotate in forward and reverse directions. a driving member that brakes the rotation of the second grinding tool, and a braking member that brakes the rotation of the second grinding tool. A gear finishing grinding device is provided in which the grinding tool is driven to rotate and the gear to be ground is ground by the first and second grinding tools; The tooth surface in contact with one tooth surface of each tooth of the gear to be ground is made a surface with large abrasive grains, and the tooth surface in contact with the other tooth surface of each tooth of the gear to be ground is made a surface with small abrasive grains. Of the pair of tooth surfaces of each cutting edge of the second grinding tool, the tooth surface that contacts the one tooth surface of each tooth of the gear to be ground is made a surface with small abrasive grains, and A gear finishing grinding device characterized in that the tooth surface of each tooth that contacts the other tooth surface is a surface with large abrasive grains.