JPS60161024A - Gear shape grinding tool - Google Patents

Abstract

PURPOSE:To improve processing efficiency, a tool life, and surface roughness of a workpiece by dividing the processing part of a gear-shaped tool body into plural portions and electrodepositing abrasive grains having different grain sizes on the respective divided portions. CONSTITUTION:The tooth face 12 of a gear-shaped tool body 11 is divided widthwise into two parts S1, S2. Coarsely graded abrasive grains 13 are electrodeposited on the part S1, while finely graded abrasive grains 14 are electrodeposited on the part S2. Upon grinding a workpiece gear with use of the above tool, the workpiece gear is roughly ground by the part S1, and then finished by the part S2. Hereby, processing efficiency, a tool life, and workpiece surface roughness are improved together.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in gear-shaped grinding tools.

As an example of a grinding tool with electrodeposited superabrasive grains, FIG. 1 shows a gear-shaped grinding tool used to improve the precision of hardened hardened gears after hardening. this is.

Abrasive grains 1, such as superabrasive grains 3 such as diamond abrasive grains and CBN abrasive grains, are electrodeposited on the tooth surface 2 of the main body 1, which are much harder than ordinary abrasive grains mainly composed of Al2O3 or SiC.

By the way, the general characteristics of these electrodeposition tools are as follows:
Second, the larger the grain size of the abrasive grain, the greater the adhesion of the abrasive grain to the tool, resulting in less falling off of the abrasive grain during machining. The smaller the grain size.

For example, the roughness of the workpiece becomes smaller. Therefore, if you increase the grain size of the abrasive grains with emphasis on machining efficiency and tool life, the roughness of the workpiece will be sacrificed. If so, machining efficiency and tool life will be sacrificed and p, machining efficiency,
A grinding tool that was satisfactory in all aspects of tool life and surface roughness of the workpiece could not be obtained.

The present invention was made in view of these circumstances.

The objective is to provide a gear-shaped grinding tool that can improve machining efficiency, tool life, and surface roughness of a workpiece at the same time.

In order to achieve this object, the present invention is characterized in that the processed portion of the gear-shaped main body is divided into a plurality of sections, and abrasive grains of different grain sizes are sequentially electrodeposited on each section.

A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 2 is a perspective view of a gear-shaped grinding tool according to the present invention, in which the tooth surface 12 of the gear-shaped main body 11 is divided into two parts I, S2, and S2 in the tooth width direction. The abrasive grains 131.1+ with a large particle size are electrodeposited on the S□ portion, and the abrasive grains 14 with a small particle size are electrodeposited on the 82 portion.

Therefore, when grinding the entire fracture gear with this grinding tool,
First, by meshing the gear to be cut with the part S□ on which the abrasive grains 13 with a large grain size are electrodeposited and rotating both, the gear to be cut can efficiently achieve almost the desired gear accuracy using the abrasive grains 13 with a large grain size. Roughly ground with precision close to . In this case, although the machining allowance is relatively large, the abrasive grains 13 have strong adhesion to the tooth surface 12, so the tool life is not reduced.

Next, the meshing position of the gear to be cut and the grinding tool is shifted in the direction of the face width of the grinding tool, and the part S2 of the grinding tool, which is made by electrodepositing small abrasive grains 14, is meshed with the gear to be cut, and both are rotated. By doing so, the gear to be cut, which has been rough-machined in advance, is finished to a desired finished surface with the abrasive grains 14 having a small grain size. This is because the machining allowance is small in this finishing process.

Even if the adhesion force of the abrasive grains 14 having a small particle size to the tooth surface 12 is small, the abrasive grains 14 will not fall off.

Therefore, the tool life will not be reduced.

As mentioned above, high-efficiency machining is performed on the part formed by using TM of abrasive grains with a large grain size, and finishing machining of the workpiece gear with reduced machining allowance is performed on a part formed by electrodepositing abrasive grains with a small grain size. As a result, machining efficiency, tool life, and surface roughness of the workpiece can be improved at the same time.

FIG. 3 shows an example of a worm-shaped grinding tool, in which the tooth surface 22 of the second main body of the grinding tool has a portion 81' electrodeposited with large abrasive grains 23 and a portion 81' with one small abrasive grain 24 electrodeposited. part 8
It is divided into 2'.

Further, FIG. 4 shows an example of a gear-shaped grinding tool, in which the tooth surface 32 of the main body 31 of the tool has abrasive grains 33 of large particle size electrodeposited on its semi-circumferential portion Sl′, and the remaining semi-circumferential portion S2〃, abrasive grains 34 having a small particle size are electrodeposited. Therefore, the same effect as described above can be obtained with these tools.

In the above embodiments, the machining part of the grinding tool body is divided into two parts, but depending on the specifications of the workpiece, machining conditions, etc., it can be divided into three or more parts, and abrasive grains of different grain sizes are placed in each part. Sequential electrodeposition may also be performed. It is also possible to electrodeposit abrasive grains with different grain sizes on a single body, but it is also possible to electrodeposit abrasive grains with different grain sizes on separate bodies and use them as a single tool. can.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a gear-shaped grinding tool according to a conventional example;
The figure is a perspective view of a gear-shaped grinding tool according to the present invention, and FIGS. 3 and 4 are views of modified embodiments of the present invention. In the drawing. 11, 21, and 31 are the tool bodies. 12.22.32 are tooth surfaces, 13.14, 23, 24, 33.34 are abrasive grains. Figure 1

Claims (1)

[Claims] All processed parts of the gear-shaped main body are divided into a plurality of parts. A gear-shaped grinding tool characterized by sequentially electrodepositing abrasive grains with different particle sizes in each section.