JPH04269164A - Dressing method of grinding wheel for spur and herical gear griding - Google Patents

Abstract

PURPOSE:To eliminate the need for complicated calculation and motion and to execute dressing correctly, by driving a dresser with the dressing of a forming griding wheel used for the single pass grinding of a spur or helical gear being in the similar relation to a griding work. CONSTITUTION:The dressigng of a grinding wheel 12 is executed in the same gist as the grinding of a work the use as a dresser 10 of the device where a diamond particle is electrodeposited to a master gear made of the same metal as that of the grinding work. Consequently the dressing of the grinding wheel 12 for the single pass grinding of a spur or helical gear can easily be executed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of dressing a grindstone for grinding spurs and helical gears.

0002

[Prior Art] When grinding the tooth surface of a gear after gear cutting using a hobbing machine or the like using a forming grindstone, one tooth at a time in one pass, the forming of the grindstone is important in order to maintain the required finishing accuracy. This is the point.

[0003]For this type of one-pass grinding of gear tooth surfaces, shaped grindstones are used, and conventionally, there are the following two types of shaped grindstones.

One of them is a CB on a metal base disk.
A grinding wheel with N abrasive grains electrodeposited is used. In this case, the cross-sectional shape of the outer periphery of the base disc is shaped to match the tooth profile of the target gear. Manufactured and delivered based on the previously requested specifications. In this case, the whetstone is a disposable type and cannot be regenerated by dressing, so generally,
Predetermined grinding length (e.g. 600-800m in total)
When it reaches the end of its service life, it must be returned to the whetstone manufacturer for CBN.
Although the abrasive grains are redeposited, it can only be redeposited twice. This is because if the cross-sectional shape of the outer periphery of the base disk is deformed due to wear etc. during re-electrodeposition, it takes a long time to restore it to the correct shape, and it is almost impossible to correct it. It is.

Another method is to use a machine with a dresser device, as shown in FIGS. 4 and 5, to form and grind an alumina or ceramic-based CBN grindstone.

First, FIG. 4 shows a combination of operations in which the grinding wheel (2) is rotated and moved toward and away from the rotating dresser (1) in the front and rear directions, and at the same time, the dresser (1) is moved left and right in the axial direction. In this method, the grindstone (2) is formed using the following methods. In this case, the dresser (1) may be disc-shaped or single-diamond-shaped.

FIG. 5 also shows the grindstone (2) in the front and back direction (a).
In this method, the grindstone (2) is shaped by being brought into contact with the rotating dresser (1) while moving it in the left and right directions (b). In this case, the dresser (1) is a single diamond type.

[0008]

[Problems to be Solved by the Invention] Conventional disposable type products have the drawback of increasing processing costs. Also, Figure 4
In the case of the type using the conventional dresser (1) shown in Fig. 5, in the case of a spur gear, it is sufficient to form the cross section at right angles to the tooth, but in the case of a helical gear, the contact position between the grinding wheel (2) and the workpiece (3) is not perpendicular to the teeth, and the grindstone (2
) changes in the diameter position, the shape of the grindstone (2) changes and becomes very complicated. That is, the grindstone (
2) and the relative movement direction and speed of the dresser (1) must be performed each time, taking into account changes in the external shape due to wear of the grinding wheel (2), which is extremely complicated. This requires calculations and requires equipment for it, which is expensive. Furthermore, the types of FIGS. 4 and 5 are
It is necessary to change the posture of the grindstone (2) when grinding the workpiece (3) and when dressing it with the dresser (1), which not only complicates the mechanism but also requires extra movement and time. There was a drawback.

[0009] In view of the above-mentioned drawbacks of the prior art, the present invention solves the following problems:
In order to solve this problem, it was proposed to create a grinding wheel for grinding spar and helical gears that can be dressed very easily without the need for complex calculations and operations related to the dresser and grinding wheel diameter. The present invention attempts to provide a dressing method.

0010

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a metal master gear that is formed by electrodepositing diamond particles on a metal master gear that is made under the same conditions as the number of teeth, tooth profile, and tooth trace of the grinding workpiece. A dresser is used to dress the grindstone in the same way as grinding the workpiece.

[0011] When carrying out the above dressing,
This can be done by replacing the dresser with the workpiece and installing it on the workpiece arbor, or by installing both the workpiece and the dresser on the workpiece arbor, grinding the workpiece and dressing the grindstone periodically or at any time. It is to be done as appropriate. Of course, the dresser may be attached to a device exclusively for dressing.

0012

[Operation] During dressing, the dresser is treated as a workpiece, the grindstone is brought into contact with the dresser, and both are operated under the same conditions as when grinding the workpiece (however, the rotation speed of the grindstone and other parameters are adjusted to optimal conditions). As a result, the grindstone is formed according to the tooth profile and tooth trace of the dresser. Since the tooth profile and tooth trace of this dresser are the same as those of the work to be ground, the shape of the grindstone formed by this dresser is the optimal shape for the shape of the target work to be ground every time. Since each dressing uses only one tooth out of the dresser's multiple teeth, if you cycle through different teeth each time, it will last for a long time. It is possible to perform good dressing over a period of time. If this dresser is replaced with a work arbor and installed, a device dedicated to the dresser can be omitted. Furthermore, if this dresser is attached to the work arbor together with the work, dressing can be performed at any time, improving efficiency.

[0013]

[Example] Fig. 1 is a perspective explanatory view of the relationship between a grindstone and a dresser showing the dressing method of the present invention, and Figs. 2 and 3 are schematic front views of main parts showing other embodiments of the dressing method of the present invention. .

First, as shown in FIG. 1, the present invention uses, as a dresser (10), a metal master made under the same conditions as the number of teeth, tooth profile, and tooth trace of the target grinding work, that is, the spar or helical gear. A gear with diamond particles electrodeposited on it is used.

Next, the dresser (10) is attached to the arbor (11) and approached while rotating the grindstone (12), and the arbor (11) of the dresser (10) is moved in the axial direction while rotating. In this case, the dresser (1
The rotation and axial movement of the arbor (11) of 0) are related so that the contact position between the grindstone (12) and the dresser (10) moves relatively along the tooth trace of the target helical gear. It is driven synchronously. Such synchronous drive may be performed under the same conditions as when grinding the workpiece with the grindstone (12). That is, spur or helical gear (
The grinding wheel (12
) to operate the grindstone (12) and dresser (10) in the same manner as when grinding. This allows the grindstone (
12) is formed to match the tooth profile and tooth trace of the helical gear to be ground. However, during dressing and when grinding the workpiece, the relationship between the rotation speed of the grindstone (12), the cutting speed, the rotation speed of the dresser (10), and the axial movement speed, etc., is set to an appropriate value. .

FIG. 2 shows the case where the above-mentioned dresser (10) is attached to the work arbor (13) in place of the grinding work. In the case of FIG. 1, for example, it is attached to the arbor (11) exclusively for dressing. In the case shown in Fig. 2, the work arbor (
13), when dressing, instead of the workpiece,
A dresser (10) is attached to dress the grindstone (12).

FIG. 3 shows a dresser (10) attached to a work arbor (13) together with a workpiece (14). Compared to the above, the one shown in Fig. 3 eliminates the need for such replacement.

In any of the embodiments shown above,
The dresser (10) has the same number of teeth as the target workpiece,
It has a dressing part, which can be used sequentially, so it has a long life.

In the illustrated example, a helical gear has been described, but the present invention is also applicable to a spur gear.

[0020]

According to the invention of claim 1, it is possible to dress a shaped grindstone used for one-pass grinding of a spur or helical gear by driving a dresser in the same manner as the grinding work, thereby eliminating the need for complicated calculations. No action required
Dressing can be done very easily and accurately.

According to the invention of claim 2, in addition to the above effects, during dressing, the dresser is replaced with the workpiece and attached to the workpiece arbor, and the workpiece arbor and grindstone shaft are driven in the same relationship as when grinding the workpiece. This eliminates the need for dedicated dressing equipment.

According to the invention of claim 3, in addition to the effects of claim 2, it is further possible to eliminate the need to exchange the workpiece and dresser during dressing, and dressing can be performed at any time, thereby improving work efficiency. Can be done.

[Brief explanation of the drawing]

FIG. 1 is a perspective explanatory view of the relationship between a grindstone and a dresser, showing the dressing method of the present invention.

FIG. 2 is a schematic front view of main parts showing another embodiment of the dressing method of the present invention.

FIG. 3 is another embodiment similar to FIG. 2;

FIG. 4 is a schematic explanatory diagram of main parts showing an example of a conventional dressing method.

FIG. 5 is a schematic explanatory diagram of main parts showing another example of a conventional dressing method.

[Explanation of symbols]

10 Dresser 12 Whetstone 13 Work Arbor 14 Work

Claims (3)

[Claims] Claim 1: Shaped dressing of the grindstone in the same manner as grinding the workpiece using a dresser made by electrodepositing diamond particles on a metal master gear made under the same conditions as the number of teeth, tooth profile, and tooth trace of the workpiece to be ground. A method for dressing a whetstone for grinding spur and helical gears, the method comprising: [Claim 2] A dresser made by electrodepositing diamond particles on a metal master gear made under the same conditions as the number of teeth, tooth profile, and tooth trace of the workpiece to be ground is attached to the workpiece arbor, and a grindstone is used in the same manner as for grinding the workpiece. 1. A method for dressing a grinding wheel for grinding spurs and helical gears, characterized by performing shaping dressing. [Claim 3] A dresser formed by electrodepositing diamond particles on a metal master gear made under the same conditions as the number of teeth, tooth profile, and tooth trace of the workpiece to be ground is attached to the workpiece arbor together with the workpiece, and the workpiece is ground. A method for dressing a whetstone for grinding spar and helical gears, which comprises appropriately dressing the whetstone.