JPS625731B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of grinding and finishing the tooth surface of a gear using a screw grindstone.

Conventionally, when grinding the tooth surface of a gear using a screw grindstone, the tooth surface of the gear and the grinding surface of the grindstone are meshed and rotated synchronously while relative movement (forward motion) in the tooth width direction is performed, allowing for a single cut. Grind only the set depth of cut over the entire tooth width, then grind the set depth of cut over the entire tooth width in the back movement, and after repeating this reciprocating grinding motion a predetermined number of times, finish grinding over the entire tooth width. It was done by doing it once. However, when grinding while reciprocating the grindstone and gear in the tooth width direction, the movement speed is reduced to 2 because the grinding wheel and gear are moving while grinding.
It is practically difficult to increase the speed faster than about mm/1 revolution from the viewpoint of grinding accuracy, and since the abrasive surface and the surface to be polished are in line contact, the grinding efficiency is low and the drawback is that it takes a long time to grind. be.

An object of the present invention is to provide a gear grinding method that can finish grinding the tooth surface of a gear in a shorter time than conventional grinding methods.

The tooth surface grinding and finishing method of a gear according to the present invention includes a displacement step in which a screw grindstone is placed in a position corresponding to a first grinding width set on one end of a tooth surface of a gear to be cut that is rotatably supported; and the gear are rotated synchronously to grind the first grinding width by a set depth of cut, then the cutting is stopped until the gear has made one rotation or more, and the grinding is further continued by the set depth of cut, and the cutting is continued until the gear has made one rotation or more. A grinding process in which the first grinding width is ground until a finish grinding allowance is left by repeating this operation. A displacement process in which the screw grinding wheel is placed in a position corresponding to the grinding width, a grinding process in which the second grinding width is ground until a finishing grinding allowance is left, similar to the grinding process described above, and the grinding process and displacement process are sequentially repeated to obtain the entire tooth width. After grinding until a finishing allowance is left, the other end of the tooth width is known, and the finishing grinding process involves grinding the remaining finishing allowance and the remaining grinding allowance between each grinding width while moving the grindstone along the tooth surface. configured.

Next, the present invention will be explained based on embodiments shown in the drawings.

Reference numeral 1 indicates a screw grindstone which is arranged horizontally and has a screw-shaped grinding surface on its outer periphery; 2 is a grindstone moving mechanism that rotationally drives the screw grindstone 1 and moves it back and forth horizontally in the direction of the workpiece; 3 is a gear to be cut; 4 is a gear support mechanism that supports the gear 3 vertically, rotates it in synchronization with a screw grindstone, and reciprocates it in the vertical direction.

This gear grinding method is performed in the following order.

Tooth surface 30 of gear 3 supported by gear support mechanism 4
The grinding surface 11 of the screw grinding wheel 1 is placed in a position corresponding to the first grinding width 31 set on one end, and the gear 3 and the screw are pressed while pressing the grinding surface 11 of the screw grinding wheel 1 against the first grinding width 31. The grinding wheel 1 is rotated synchronously, grinding is performed by a set depth of cut A1 that is set within the allowable range for one cut, and the cutting is stopped until the gear rotates one rotation or more. The stop of this cut is
This is done to grind the gear evenly in the circumferential direction. The grinding width is appropriately determined depending on the outer diameter of the grindstone, the outer diameter of the gear, and the module. Next, grind the set depth of cut A2, and once again the gear is 1
Stop cutting until the rotation is over. This operation is repeated to grind the first grinding width until a finish grinding allowance is left. This grinding process involves the grinding surface 11 of the whetstone and the gear 3.
This is done efficiently because there is surface contact with the tooth surface to be ground. Next, the tooth surface of the gear 3 is once separated from the grinding surface of the grinding wheel 1, and the grinding wheel 1 and the gear 3 are relatively displaced (forward motion) to correspond to the second grinding width 32 set adjacent to the first grinding width 31. The grinding surface of the screw grindstone 1 is made to correspond to the position. This displacement process can be performed quickly because it does not move while grinding. Subsequently, the second grinding width 32 is ground in the same grinding process as the first grinding width until a finish grinding allowance is left. For example, in the case of a gear with a tooth width of 10 mm, it is sufficient to perform this grinding process four times.

Thereafter, the grinding process and the displacement process are sequentially repeated until the entire tooth width is ground until a finishing allowance remains. Next, the other end of the tooth width is known, and the grinding wheel 1 is moved (returning) along the tooth surface to grind the finishing allowance and the remaining grinding allowance between each machining width. As a result, the tooth surface of the gear 3 is finished in one reciprocating motion between the grindstone 1 and the gear 3.

As described above, in the gear tooth surface grinding method of the present invention, after the entire tooth width is ground by repeating the grinding process and the displacement process until a finishing allowance is left, the other end of the tooth surface width is known, and the grinding wheel is moved along the tooth surface. Since the finishing allowance left while moving and the remaining grinding allowance between each grinding width are ground, the grinding process of the tooth surface of the gear can be done in a shorter time compared to conventional processing methods.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of essential parts of a gear grinding device used in the gear grinding method of the present invention, FIG. 2 is a plan view of the gear, and FIG. 3 is an enlarged side view. In the figure, 1...screw grindstone, 2...screw grindstone movement mechanism, 3...gear, 4...gear support mechanism.

Claims (1)

[Claims] 1. A displacement step of aligning a screw grindstone to a position corresponding to a first grinding width set on one end of a tooth surface of a rotatably supported gear to be cut, and synchronizing the screw grindstone and the gear. The first grinding width is rotated to grind the first grinding width by a set depth of cut, then the cutting is stopped until the gear rotates one time or more, and the gear is further ground by the set depth of cut, and the depth of cut is stopped until the gear rotates one time or more. A grinding process in which the first grinding width is repeatedly ground until a finish grinding allowance is left; the tooth surface of the gear is separated from the grinding surface of the grinding wheel, and the second grinding width is set adjacent to the first grinding width. A displacement process in which the screw grindstone is adjusted to the position; A grinding process in which the second grinding width is ground until a finishing grinding allowance is left, similar to the grinding process described above; The grinding process and a displacement process are sequentially repeated until the entire tooth width is finished with the finishing grinding allowance. After grinding until the other end of the tooth width is known, the grinding wheel is moved along the tooth surface to grind the remaining finishing allowance and the remaining grinding allowance between each grinding width. Grinding finishing method.