JP2681575B2 - Dressing method of whetstone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dressing a grindstone used when a grindstone having a tooth portion meshing with a gear is rotated in a meshed state with the gear to crown the tooth surface of the gear.

[0002]

2. Description of the Related Art Since the tooth profile of a gear causes noise and the like if it is not molded accurately, the honing grindstone having a tooth portion that meshes with a gear is engaged with the gear as a final step after heat treatment. While rotating in this state, the tooth flanks of the gear are honed.When performing this honing process, in order to improve the contact of the tooth flanks of the gear, both sides of the tooth flank in the tooth trace direction are ground and the crowning that raises the center part is done. May be done. As for such crowning,
For example, according to Japanese Patent Publication No. 52-2519, a swing table which is swingable around a horizontal rotation axis perpendicular to the sliding direction of the slide table is provided on a slide table which is slidable in the horizontal direction. A gear is held on the swing table so as to be rotatable about a rotation axis that is long in the sliding direction of the slide table, and the slide table is reciprocated while rotating the honing stone in a meshed state with the gear, Further, in conjunction with the reciprocating motion, the rocking table is rocked so that both sides of the gear tooth surface in the tooth trace direction are brought closer to the honing grindstone from the central portion and are carved from the central portion so that the tooth surface of the gear is crowned. What you have done is known.

[0003]

Teeth shape of the wheel [0006], wherein
A so-called reverse claw that dents the center of the tooth from both sides
Gearing meshes with this whetstone
When rotated, both sides of the gear tooth surface in the tooth trace direction are in the center.
Since it is pressed against the teeth of the Rimo grindstone and is ground,
The tooth flank is crowned without swinging the rotation axis of the
However, if the crowning process is continued
Since the shape of the awning collapses, dressing the grindstone regularly
Need to

Therefore, in view of the above problems, the present invention crowns the tooth flanks of the gear without swinging the rotation axis of the gear.
An object of the present invention is to provide a dressing method for a whetstone that can be performed .

[0005]

In order to achieve the above object, the present invention provides a method of rotating a grindstone having a tooth portion meshing with a gear in a meshed state with the gear to crown the tooth surface of the gear. The tooth of the grindstone used in the crowning method is to engage the gear with a reverse-crowning grindstone and rotate the grindstone without rocking the rotation axis of the gear .
The dressing method has the same specifications as the gear above.
Engage with a gear type dresser having a crowning tooth surface
While rotating the grindstone in the combined state,
The dresser is axially driven with a width corresponding to the amount of crowning.
The teeth of the grindstone by reverse
It is characterized by dressing in a rugged shape .

[0006]

[0007]

[Operation] Using a gear type dresser with the same specifications as the gear,
In place of the gear type dresser meshed with the grindstone
By rotating the grindstone, it is the same as when machining the gear
The tooth part of the grindstone is dressed in the reverse crowning shape
I was allowed to go. At this time, dresser's oscillation
If the width of the dresser is reduced, the tooth surface of the dresser is crowned.
The shape is transferred to the tooth surface of the grindstone, increasing the amount of reverse crowning,
As the oscillation width is increased, the tooth part of the grindstone
Dressed close to
The amount of crowning on the tooth flank of the gear.
By setting the oscillation width correspondingly,
The reverse crowning amount is specified, and this gear type dresser
Dress stones in any desired reverse crowning shape
Can be .

[0008]

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of a processing apparatus for applying the present invention will be described with reference to FIG. 1 is a bed,
A slide table 2 slidable in a horizontal direction along a guide rail 1a is placed on the bed 1, and a pair of slide tables 2 facing each other along the sliding direction of the slide table 2 are placed on the slide table 2. The center head 3 is attached. An arbor 4 having a gear G attached to the center thereof is sandwiched by the center head 3 and is rotatably held around a longitudinal axis in the sliding direction of the slide table 2. A grindstone S which is rotationally driven by the spindle head 5 is meshed with the gear G, and the gear G is rotated together with the grindstone S when the grindstone S is rotationally driven.

As shown in FIG. 2, the rotational axis S1 of the grindstone S is
Is not parallel to the rotation axis G1 of the gear G but a predetermined crossing angle α is provided, and the tooth portion So of the grindstone S is formed in an inverted crowning shape in which the tooth trace center portion is recessed. Therefore, if the grinding stone S is rotated and the slide table 2 is reciprocated with the width L while the grinding stone S is meshed with the gear G, the tooth surface g of the gear G is centered at both end portions in the tooth trace direction. It is scraped from the part and molded into a crowning shape as shown.

By the way, if the above-mentioned crowning process is continued, the reverse crowning shape of the grindstone S will collapse, so it is necessary to dress regularly. However, depending on the crowning amount of the gear G, a dedicated dresser is not used, The whetstone S is dressed by a general-purpose dresser made according to the same specifications as the gear G. That is, the dresser is held in the same state as the gear G shown in FIG. 1, and the grindstone S is meshed with the dresser and rotationally driven to dress the grindstone S as in the case of processing the gear G.

As shown in FIG. 3, each tooth portion d of the dresser D is
The tooth surface of No. 2 is crowned, and when dressing is performed, the amount of reverse crowning formed on the tooth portions Sa and Sb of the grindstone S is changed by changing the reciprocating distance of the dresser D. That is, when the oscillation width of the dresser D is set to a relatively long La, the amount of reverse crowning formed on the tooth surface of the tooth portion Sa becomes small as shown in FIG. Grindstone S
If the gear G is processed by using, the amount of crowning formed on the tooth surface of the gear G becomes small.

On the other hand, when the oscillation width of the dresser D is set to a relatively short Lb, the amount of reverse crowning formed on the tooth surface of the tooth portion Sb becomes large as shown in FIG. If the gear G is processed using the grindstone S dressed as described above, the amount of crowning formed on the tooth surface of the gear G becomes large. Therefore, simply by setting the oscillation width according to the crowning amount of the gear G to be processed,
By performing the same operation as the processing on the gear G, it is possible to dress the grindstone S with the common dresser D.

By the way, in the above embodiment, the dresser D was reciprocally moved symmetrically with respect to the center of the grindstone S in the width direction.
By reciprocating with one of them offset to one side, one of both sides of the tooth surface of the gear G can be shaved more than the other side, and the honing can be performed in a tapered shape. Further, in the above embodiment, the grindstone S having external teeth is used, but the present invention can be applied to the case where the gear is honed by the grindstone having internal teeth.

[0015]

As is apparent from the above description, according to the present invention, the grinding wheel used for crowning the tooth flanks of the gear without swinging the rotation axis of the gear is dressed.
Set the oscillation width of the dresser to
Just adjust the width corresponding to the amount of awning
By performing the same operation as the machining,
Can be dressed in an uning shape .

[0016]

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of an apparatus to which the present invention is applied.

[Figure 2] II-II cross section

[Fig. 3] II-II in the state where the dresser and the grindstone mesh with each other
Sectional view

[Explanation of symbols]

 1 bed 2 slide table 3 center head 4 arbor D dresser G gear S whetstone

Claims (1)

(57) [Claims] 1. A method of crowning a tooth surface of a gear by rotating a grindstone having a tooth portion meshing with the gear in a meshed state with the gear, wherein the tooth is meshed with a grindstone formed in an inverted crowning shape. , Of the grindstone used in the crowning method of rotating the grindstone without rocking the rotation axis of the gear
The dressing method has the same specifications as the gear above.
Engage with a gear type dresser having a crowning tooth surface
While rotating the grindstone in the combined state,
The dresser is axially driven with a width corresponding to the amount of crowning.
The teeth of the grindstone by reverse
Whetstone drainage characterized by dressing in a rugged shape
Sashing method .