JPS5852771B2 - shaving cutlet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shaving cutter used for gear machining.

Fig. 1 shows a partial front view of the shaving cutter, and Fig. 2 shows the serration shape of the cutter.The serrations of the shaving cutter vary depending on the feeding method during shaving.
There are differential serrations and non-differential serrations.

Differential serrations are generally used in the underpass shaving method and the Zolange shaving method, resulting in three or more different types of complex serrations.

On the other hand, non-differential serrations are used in conventional shaving methods and tiagonal shaving methods.

In either case, the serration shape is approximately constant depending on the size of the tooth profile of the gear, and the differential serration is relatively displaced in the direction of the tooth trace.

As for the serrations of a shaving cutter, the larger the serration pitch relative to the land width, the better the cutter's cutting performance will be, but the roughness of the gear tooth surface will deteriorate after shaving.

The purpose of the present invention is to prevent deterioration of gear tooth surface accuracy, improve cutting performance, and increase machining efficiency. For example, if the serrations are displaced by about half of the serration pitch in the tooth trace direction, the serration pitch will be substantially half of the apparent pitch.

Embodiments according to the present invention will be described below with reference to the drawings.

FIG. 3 shows a serration arrangement according to an embodiment of the present invention, and 1, 2, and 3 each show a serration arrangement in which the tooth surface of the gear sequentially contacts the tooth surface of the cutter every rotation of the gear.

That is, 3 is the same as 1, and the two types of serration arrangements shown in 1 and 2 are repeated.

1 and 2 are half of the serration pitch P, i.e. P/2
This is because the arrangement of the serrations is shifted.

When the number of gear teeth is an odd number, if the number of cutter teeth is an even number and the serrations on adjacent cutter tooth surfaces are alternately arranged in different ways, a different arrangement of serrations will come into contact with the gear tooth surface every rotation of the gear.

Furthermore, when the number of gear teeth is an even number, the number of cutter teeth may be an odd number, and the cutter tooth surfaces that come into contact with each rotation of the gear may be arranged so as to alternately have different serrations.

Similarly to the above, even when the number of gear teeth is odd,
The number of cutter teeth can be an odd number.

However, when the number of cutter teeth is an odd number, the same serrations will come into contact at only one location every time the gear rotates by the value obtained by dividing the number of cutter teeth by the greatest common divisor of the number of cutter teeth and the number of gear teeth.

As in the above embodiment, if the land position is displaced by about half the serration pitch for each rotation of the gear, even if the serration pitch is increased for the purpose of improving cutting conditions, the serration pitch will not actually change. The roughness of the gear tooth surface can be prevented from deteriorating by half of its appearance.

In addition, the value of the above-mentioned greatest common divisor is actually often 1, and the same serration of the gear continues only once for every rotation of the number of cutter teeth.
There is no practical problem.

As is clear from the above description, according to the present invention, in a shaving cutter in which the serration pitch is increased relative to the land width in order to improve the cutting performance of the cutter, the gear tooth surface generated by increasing the serration pitch Deterioration of accuracy can be prevented.

[Brief explanation of drawings]

FIG. 1 is a front view partially showing a shaving cutter, FIG. 2 is a plan view showing serrations of the shaving cutter, and FIG. 3 is a serration arrangement diagram showing an embodiment of the present invention.

Claims (1)

[Claims] 1. The cutting edges formed by serrations carved on the tooth surface are offset in the tooth trace direction by half the serration pitch between adjacent teeth. shaving cutter.