JP2002200526A - Grinding wheel for grinding work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grinding wheel that saves labor, reduces costs, shortens machining time and uniforms quality by dispensing with a separate process of chamfering work. SOLUTION: A grinding face 13 of the grinding wheel has a main grinding portion 13a for forming a bottom and tooth flanks, and sub grinding portions 13b defined continuously with the main grinding portion to grind, adjacently, ridgelines between the tooth flanks and tooth crests as the main grinding portion grinds a space.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding wheel for forming teeth. Here, the teeth refer to gear teeth, splines, and the like.

[0002]

2. Description of the Related Art Conventionally, for the formation of teeth with high precision, forming and grinding in which a working material is ground with a formed grindstone (grinding wheel) formed in a tooth groove shape has been performed. In this forming grinding, an involute gear is formed by grinding a cylindrical material having an outer diameter of a desired addendum circle with, for example, a grinding wheel having a tooth groove type grinding surface based on an involute curve, or forming an involute spline. Or a shaft having the same.

[0003]

In the tooth formed in this way, the ridge line where the tooth tip surface and the tooth surface intersect tends to be lost,
Further, burrs are generated along the ridge line, so that chamfering is required. This chamfering is performed separately from tooth profile grinding and is performed manually using a baby grinder or the like, so that there is a problem that the cost is high, the quality is uneven, and the processing time is long in the case of difficult-to-cut materials.

[0004] The present invention has been made in view of such problems, and eliminates the need for chamfering work in a separate process, saving labor.
An object of the present invention is to provide a grinding wheel that reduces costs, shortens processing time, and achieves uniform quality.

[0005]

According to a first aspect of the present invention, there is provided a main grinding portion forming a tooth bottom and a tooth surface, and a grinding surface provided continuously with the main grinding portion. The main grinding portion is provided with a sub-grinding portion that grinds a tooth groove and a vicinity of a ridge line between a tooth surface and a tooth tip surface at the same time. In the grinding wheel according to the present invention, since the formation of the tooth space and the chamfering of the ridge line are performed at the same time, the chamfering in a separate step is not required, and the power saving of the tooth profile grinding is realized.

According to a second aspect of the present invention, in the grinding wheel according to the first aspect, the sub-grinding portion is disposed at a distance from the tooth tip surface by 2 mm.
It is characterized in that it is set at 5 ° to 50 °. In this grinding wheel, the angle of the sub-grinding portion is set to an angle suitable for preventing the loss of the tooth tip and suppressing the generation of burrs, so that the ridge line can be chamfered effectively.

According to a third aspect of the present invention, in the grinding wheel according to the first or second aspect, the main grinding portion and the sub-grinding portion are continuous on the R surface. In this grinding wheel, no corner is formed at the intersection of the main grinding portion and the sub-grinding portion, so that good grinding can be performed, and since no corner portion is formed on the tooth, damage to the tooth is also prevented. be able to.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a half sectional view showing a grinding wheel 10 according to the present invention. The grinding wheel 10 is a rotary grinding tool (grinding wheel) for forming a gear, and is a disk-shaped basic core 1 made of, for example, chrome molybdenum steel.
1 and an abrasive layer portion 1 fixed to the outer periphery of the basic core portion 11 and directly in contact with the processing material 20 during grinding.
2 is provided. In the present embodiment, CBN (cubic boron nitride (strikethrough: a diamond crystal structure material)) is used as the abrasive grain serving as a cutting edge when performing the grinding process of the abrasive grain layer portion 12. It is fixed with a metal bond or the like. On the other hand, processing material 20
For the gear, a disk-shaped, column-shaped or cylindrical-shaped one having an outer diameter corresponding to the diameter of the tooth tip circle of the gear to be formed is used.

FIG. 2 shows the detailed shape of the abrasive layer 12.
The grinding surface 13 provided on the surface of the abrasive layer portion 12 has a main grinding portion 13a formed at the outermost edge, and is smoothly connected via the R surface r on both sides with the main grinding portion 13a interposed therebetween. 1
3b is formed. The shape of the main grinding portion 13a is a transfer shape of a tooth-shaped tooth space (bottom surface and tooth surface), and is formed in an involute curve shape to grind the tooth surface, and a tooth surface grinding portion 13aa. And a tooth bottom grinding part 13ab for grinding the tooth bottom. The sub-grinding portion 13b is formed at an angle of 30 ° with respect to the tip surface q. This angle is not limited to 30 °, but may be 25 °.
~ 50 °, more preferably 30 ~ 4 as chamfer
What is necessary is just to form in the range of 5 degrees.

The tooth profile is formed by the relative movement between the work material 20 and the grinding wheel 10, and is performed, for example, as follows. As shown in FIG. 3, the grinding wheel 10
By rotating the processing material 20 along the axial direction while rotating about the axis, one tooth groove can be formed over the entire length of the processing material 20, and the processing material 20 is rotated by one pitch to finish in order. If you go, processing material 20
Are formed in the entire circumference of the gear to complete the gear. The grinding wheel 10 may be moved in the axial direction with the processing material 20 fixed, and when either the processing material 20 or the grinding wheel 10 is very large and heavy, the one that is easy to drive is driven. This has the advantage that the driving power is small.

The tooth profile formed by the grinding wheel 10 in this manner has a sub-grinding portion 13b provided at the same angle as that of the manual beveling, which grinds the vicinity of the ridgeline of the tooth tip and simultaneously forms the tooth profile. Since it is finished as if chamfered, sharp corners that are easily broken are not formed, and burrs do not occur. In other words, there is no need to perform chamfering work in a separate process, which saves labor, reduces work time,
Work costs can be reduced, and quality variations due to manual work can be prevented. Note that the range k effective as a tooth is an involute curve portion ground by the tooth surface grinding unit 13aa.

The various shapes and combinations of the constituent members shown in the above embodiment are merely examples, and various changes can be made based on design requirements without departing from the spirit of the present invention. For example, the grinding wheel 10 is disposed obliquely with respect to the axis of the processing material 20, and the processing material 20 is rotated in synchronization with the feed to be rotated and ground to form a helical gear, or a plate material is used as the processing material. By forming a rack, or by changing the shape of the main grinding portion, a spline tooth profile can be formed.

Further, the axis of the grinding wheel 10 or the axis of the work material 20 can be swung to form the crowning. The axis of the grinding wheel 10 is changed to the processing material 20.
The radial crowning moved in the radial direction of the sub-grind 1
The ridgeline cannot be ground by 3b (14b), and it is necessary to chamfer this part in a separate step. However, the working time can be reduced and labor can be saved sufficiently.

[0014]

As described above, the grinding wheel according to the first aspect of the present invention provides a main grinding portion for forming a tooth bottom and a tooth surface and a sub-grinding for grinding the vicinity of a ridge between the tooth surface and the tooth tip surface. With the provision of the portion, the formation of the tooth space and the chamfering of the ridge line can be performed at the same time, and the chamfering in a separate step is not required.

In the grinding wheel according to the second aspect, since the sub-grinding portion is set at 25 ° to 50 ° with respect to the tooth tip surface, it is suitable for preventing chipping of the tooth tip and suppressing generation of burrs. With the angle, the ridge can be chamfered effectively.

According to a third aspect of the present invention, there is provided a grinding wheel.
Since the main grinding part and the sub-grinding part are continuous on the R surface, no sharp corner is formed on the ridge line between the main grinding part and the sub-grinding part, so that good grinding can be performed and the ground teeth can be formed. Since no sharp corners are formed, breakage of the teeth can be prevented.

[Brief description of the drawings]

FIG. 1 is an overall view schematically showing an embodiment of the present invention.

FIG. 2 is an enlarged view showing a portion A in FIG.

FIG. 3 is a view showing tooth profile grinding by a main grinding wheel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Grinding wheel 11 Basic core part 12 Abrasive layer part 13 Ground surface 13a Main grinding part 13aa Tooth surface grinding part 13ab Root bottom grinding part 13b Secondary grinding part 20 Processing material k Effective tooth profile range q Tooth surface r R surface

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Takashi Chisaki 2-1 Showa-cho, Kure City, Hiroshima Prefecture Inside Kure Second Plant, Ishikawajima-Harima Heavy Industries Co., Ltd. (72) Inventor Norimasa Taga 2 Showa-cho, Kure City, Hiroshima Prefecture No. 1 Ishikawajima-Harima Heavy Industries Co., Ltd. Kure No. 2 Plant (72) Inventor Mitsuru Watanabe 787 Tao, Ichihara-shi, Chiba Prefecture Asahi Diamond Industry Co., Ltd. Chiba Tsurumai Plant F-term (reference)

Claims (3)

[Claims] 1. A grinding wheel used for forming teeth, comprising: a main grinding portion forming a tooth bottom and a tooth surface as a grinding surface; and a main grinding portion provided continuously with the main grinding portion. A grinding wheel, characterized by comprising a sub-grinding portion for grinding the vicinity of a ridge between a tooth surface and a tooth tip surface while simultaneously grinding a tooth groove. 2. The sub-grinding section has an angle of 25 ° with respect to a tooth tip surface.
The grinding wheel according to claim 1, wherein the angle is set to 50 °. 3. The grinding wheel according to claim 1, wherein the main grinding portion and the sub-grinding portion are continuous on an R surface.