JPS60104611A - Gear finishing method - Google Patents

Abstract

PURPOSE:To provide a high accuracy gear for a short time by making a roller dies and a gear to be cut mesh with each other and rotate forward and backward. CONSTITUTION:When a gear 6 to be cut is finished, a spindle head 7 is first lowered to make a roller dies 9 on a spindle 8 mesh with said gear 6 and then the roller dies 9 together with the spindle 8 is rotatably driven to drive said gear 6 meshing with the roller dies 9. Under this condition, the roller dies 9 and said gear 6 are pressed lightly against each other with a certain force on the line connecting their centers by a device 10 to be rotated forward and backward every several seconds. Thus, by relatively simple equipment are squeezed the surface roughness and irregularities on the tooth surface of said gear 6 to smooth the tooth surface.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gear finishing method using a gear-shaped lawn die.

There are many finishing methods for gears, but the shaving method is often used for gears for automobiles and industrial machinery. However, in order to carry out this processing method, expensive equipment and tools such as a shaving machine and a shaving cutter must be prepared, which makes it unsuitable for the recent trend toward lower product costs. One way to reduce the cost of products is to reduce the cost of shaving machines and shaving power, but these are established technologies and there is little room for cost improvement.

Due to the above-mentioned circumstances, there is a desire for the emergence of a new machining method that can perform intermediate wheel finishing at low cost, and has accuracy equal to or better than the conventional single wheel finishing method. .

In order to meet the above-mentioned demands, the present invention was developed based on the idea of smoothing out the surface roughness and irregularities of the gear surface by crushing and smoothing it. The lawn die is engaged with the steel car to be machined, and while the steel car to be cut is rotatably supported, the lawn die is driven to rotate in forward and reverse directions, and a force is applied between the lawn die and the steel car to be machined so that they approach each other relative to each other. It is characterized by

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the one-single finishing method according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the front appearance of a gear finishing machine used for carrying out the method of the present invention. This machine was used on a shaving machine, and tailstocks 4 and 5 each having centers 2 and 3 were installed on the bed l), pre-processed gears (
The gear to be cut 6 is rotatably supported by these tailstocks 4 and 5 at both centers. A spindle head 7 is provided above the bed 1 so as to be movable up and down, and its spindle 8 is rotatable in forward and reverse directions.
A gear-shaped roller die 9 as shown in FIGS. 2(a) and 2(b) is attached to the holder. In the figure, reference numeral 10 denotes a device that applies pressure in the center-to-center direction between the roller die 9 and the gear 6 to be cut.

To finish finishing the gear to be cut 6, first lower the spindle head 7 and insert the roller die 9 on the spindle 8, the gear to be cut 6, and the upper third
As shown in the figure, they are engaged, and then the roller die 9 is driven and rotated together with the main shaft 8, and the gear 6 to be cut, which is engaged with the roller die 9, is rotated (driven). In this state,
Using the above device, the roller die 9 is pressed against the gear 6 to be cut, or the gear 6 and the two dies 9 to be cut, with a light constant force in the center-to-center direction, and the roller die 9 is rotated forward and backward for several seconds at a time. As a result of the above, the surface roughness and irregularities on the tooth surface of the gear to be cut 6 are crushed, and the tooth surface becomes smooth. In addition, roller dice 9
The reason for rotating forward and reverse is to process both tooth surfaces of the gear 6 to be cut.

Fig. 4 (a) Φ) and Fig. 5 (a) ka) show a gear after pre-processing (for example, hobbing) and a tooth trace on the tooth surface of a gear finished by the method of the present invention after pre-processing. Direction (direction a in Figure 6)
and accuracy in the tooth profile direction (direction b in FIG. 6). Note that the symbols in Fig. 4 (a)) and Fig. 5 (a) correspond to those in Fig. 6, and R and L indicate the right side of the tooth and the left side of the tooth. To and B indicate the upper and lower sides of the tooth; Tli.

RO indicates the tooth tip and tooth root, respectively. Furthermore, Figures 7 and 8 show the single binte error and cumulative pitch error of the gear after pre-machining and the gear finished by the method of the present invention after pre-machining.
1-en are shown respectively. As you can see from these figures, JIS 2 to 3 grades will improve to JIS 0 to 1 in just 1 minute.

Further, FIG. 9 shows the measurement results of meshing noise of gears that have been shaved, gears that have been pre-processed, and gears that have been finished by the method of the present invention after pre-processing. In the figure, (◎)
Symbols (•) indicate those after pre-processing, and (○) indicate those after pre-processing using the method of the present invention. As can be seen from this figure, the gear finished by the method of the present invention is 2 to 3 d
V., which shows a low B (A scale) value and is equivalent to the shaved material, has a better noise reduction effect.

The method of the present invention is similar to finish rolling and shaving processing, but does it involve aggressive cutting? It differs greatly from these methods in that it does not give anything.

As described above in detail based on the examples, a roller die having a complete gear shape is meshed with a gear-cut workpiece gear, and the roller die is driven to rotate in forward and reverse directions while the workpiece gear is fully rotatably supported. At the same time, a force is applied between the roller die and the gear to be cut relative to each other, and the roller die crushes the grooves and irregularities on the tooth surface of the gear to be cut, making the tooth surface smooth. According to the gear finishing method of the present invention, an inexpensive roller die is used as a tool, so initial costs and running costs can be reduced, and special equipment with high rigidity is not required. Equipment costs can also be reduced, and gear manufacturing costs can also be reduced. In addition, according to the method of the present invention, since it is only necessary to fully engage the cutter die and the gear to be cut and rotate the gear in the forward and reverse directions, machining can be carried out in a short time, workability is improved, and the tooth profile, tooth trace, pitch, etc. All gears with excellent precision can be written.

[Brief explanation of drawings]

Fig. 1 is a front view of an example of a gear finishing machine used to implement the method of the present invention, Figs. 2(a) and 2(b) are a front view and a sectional view of a roller die, and Fig. 3 is a roller die and a gear to be cut. r#
Figure 4 (a) Φ) is a diagram showing the accuracy of the gear after pre-machining; Figure 5 (a)) is a diagram showing the accuracy of the gear machined by the method of the present invention. Figure 6 is a perspective view of a part of the gear, Figures 7 and 8 are the single pitch error and cumulative pitch error of the gear after pre-machining and the gear finished by the method of the present invention. FIG. 9 is a graph showing sound pressure levels due to meshing of gears after shaving, gears after pre-processing, and gears finished by the method of the present invention. In the drawing, 6 is a gear to be cut, 8 is a main shaft, and 9 is a roller die. Patent Applicant: Mitsubishi Heavy Industries, Ltd. Musashi Precision Industry Co., Ltd. Sub-Agent Patent Attorney Shibe Mitsuishi (and 1 other person) Figure 2 (a) (b) Figure 3 Figure 4 (a) Figure 4 (b) ) F? OTi iO

Claims (1)

[Claims] National army shape'f! :The eggplant roller die is engaged with the machined steel wheel that has been cut by t-m, and the roller die is driven in forward and reverse rotation while the workpiece wheel is rotatably supported. A gear finishing method characterized by applying relative forces that bring them closer to each other.