JPS6357118A - Shaving cutter - Google Patents

Abstract

PURPOSE:To uniformize a cutting quantity to a work gear by a normal rotation side cutting edge and a reverse rotation side cutting edge as well as to aim at improvement in tooth strength, by making an infeed rate by the normal rotation side cutting edge smaller than that by the reverse rotation side cutting edge. CONSTITUTION:A rake angle of a normal rotation side cutting edge 3 is set to be larger than that of a reverse rotation side cutting edge 4 whereby an infeed rate by the normal rotation side cutting edge 3 becomes smaller than that by the reverse rotation side cutting edge 4. The shaving cutter constituted like this is attached to a shaving machine, and when it is rotated as mutually engaged with a work gear, at the time of normal rotation on the basis of working cycle, even if the work gear as a workpiece is pressed to the shaving cutter and infeed is carried out, a cutting quantity to the work gear by both these cutting edges 3 and 4 can be uniformized and, what is more, any step cutting is preventable, and such an effect that improves tooth strength is well promotable.

Description

Detailed Description of the Invention (Field of Application in H Business) This invention provides cutting blades by forming a number of grooves on the south side of a staggered gear that meshes with a gear to be processed as a workpiece, and shaving with this cutting blade. The present invention relates to a shaving cutter that performs (Sl)ζIV i ng).

(Prior Art) Conventionally, the above-mentioned shaving cutter etc., for example,
There is a cutter described in Japanese Utility Model Application Publication No. 60-127825.

That is, as shown in FIG. 5, this shaving cutter is provided with a plurality of tooth pieces 53 on the outer periphery of the cutter body 51 that mesh with the additional tooth width 52 (see FIG. 6), and This is a shaving cutter in which the rake angle of the turning side cutting edge 54 and the rake angle of the reversing side cutting edge 55 are set to be equal, and the cutting distance by each of the above-mentioned cutting blades 54 and 55 is set equally.

The above-mentioned shaving cutter is rotated in the forward rotation direction (in the direction of the arrow in FIG. 6) to cut into the workpiece gear 52 with the forward rotation side cutting blade 54, and then the cutter is rotated in the reverse direction. Since shaving is performed based on the cycle that ends the Bunnji cut shaving process, if the cutting amount between the forward rotation side cutting blade 54 and the reverse rotation side cutting blade 55 is equal to U, the normal rotation will occur as shown by the imaginary line in FIG. The cutting amount by the reversing side cutting blade 54 is greater than the cutting amount by the reversing side cutting blade 55, and a step protrusion 56 is formed by shaving on the gear 52 to be processed, and as a result, stress is applied to the step protrusion 56. There was a problem in that the tooth strength of the corrugation gear 52 was reduced due to concentration of the corrugation gear.

(Purpose of the Invention) The present invention makes uniform the cutting amount of the gear to be machined by the cutting blade on the forward rotation side and the cutting edge on the reverse rotation side, prevents the above-mentioned step, and improves the strength of the gear to be machined. The purpose of the present invention is to provide a shaving cutter that can achieve the desired results.

(Structure of the Invention) This invention is characterized in that the IJ is a shaving cutter in which the cut ω caused by the cutting edge on the forward rotation side of each tooth piece is smaller than the cutting edge caused by the cutting edge on the reverse rotation side.

(Effects of the Invention) According to the present invention, the cutting amount of the turning side cutting blade is set smaller than that of the reversing side cutting blade, so the gear to be machined is adjusted based on a predetermined shaving cycle. When shaving, the cutting amount of the above-mentioned workpiece gear by the forward rotation side cutting blade and the reverse rotation side cutting blade becomes uniform as a result, the step of this gear for corrugation disappears, and the tooth strength of the same gear increases. This has the effect of making it possible to improve the situation.

(Example) An embodiment of the present invention will be described in detail below based on the drawings.

The drawing shows a shaving cutter, and in FIG. 1, this shaving cutter has a plurality of tooth pieces 2 on the outer periphery of a cutter body 1 meshing with a workpiece gear (not shown). , for convenience of illustration, only one tooth piece is shown), and each of the above-mentioned tooth pieces 2...
The cutting light caused by the forward rotation side cutting blade 3 is set to be smaller than the cutting edge caused by the reverse rotation side cutting blade 4.

In the embodiment shown in Fig. 1, the J rake angle of the forward cutting edge 3 (the four angles between the lower surface parallel to the bottom passing through any one point on the cutting edge and the cutting surface) is By setting the rake angle to be larger than the rake angle of the blade 4, the cutting edge ω by the forward cutting edge 3 is set smaller than the cutting edge by the rotating cutting edge 4.

When the shaving cutter configured in this manner is attached to a shaving machine (not shown) and rotates in mesh with the corrugation gear, the corrugation gear as a workpiece is pressed against the shaving cutter during forward rotation based on the machining cycle. [Even if the depth of cut is made using the cutting edge, the cutting a by the forward cutting edge 3 is set smaller than the cutting m by the rotating cutting edge 4, so as a result, the above-mentioned double cutting of the gear to be machined will occur. It is possible to make the amount of cutting by the blade 3.4 uniform, and it is possible to prevent the gear to be machined from being damaged, which has the effect of improving the tooth strength of the gear. be.

FIG. 2 shows an example of Haku. In this example, the pitch P1 of the forward rotation side cutting edge 3 is set to be smaller than the pitch P2 of the reverse rotation side cutting edge 4, that is, P 1 <ρ2. By doing so, the cutting tension caused by the forward rotation side cutting blade 3 is set to be smaller than that of the cut product caused by the reverse rotation side cutting blade 4.

Even with this configuration, the same functions and effects as in the previous embodiment are obtained, so in FIG. 2, the same parts as in FIG. do.

FIG. 3 shows yet another embodiment, in which the land width p1 of the forward cutting edge 3 is set larger than the land width j2 of the reverse cutting edge 4. The groove width g1 of the rotating cutting edge 3 is set smaller than the groove width g2 of the rotating cutting edge 4, that is, ρ1>12, ql<Q2; The cutting edge created by the cutting edge 4 is set smaller than the cutting edge created by the cutting blade 4 on the reverse side.

Even with this configuration, substantially the same effects as in the previous embodiment can be achieved, so in FIG. 3, the same parts as in FIG. 1 are given the same numbers, and detailed explanation thereof will be omitted.

FIG. 4 further shows another embodiment as a developed view of #4 piece 2. In this embodiment, the serration movement pitch S1 of the forward cutting edge 3 is changed to By setting the moving pitch S2 to be small, that is, by setting Sl<S2, the cutting edge by the normal rotation side cutting blade 3 is set smaller than the cutting by the reverse rotation side cutting blade 4.

Even with this configuration, the cutting amount by the normal rotation side cutting teeth 3 is small, so almost the same effect as the previous embodiment can be achieved by using the Hata J.
Ru.

In FIG. 4, the same parts as in FIG. 1 are given the same numbers, and detailed explanation thereof is omitted.

■ In the second type, the cutting edge of the normal rotation side cutting edge 3 is set slightly relative to each of the normal rotation side cutting edge 4, so the specified shaving process → -C1 coating based on the noise When the processing gear is shaved, the cutting ω of the above-mentioned gear to be processed by the forward rotation side cutting blade 3 and the reverse rotation side cutting blade 4 becomes uniform, and as a result, it is possible to prevent the gear to be processed from being stepped. At the same time, there is an effect that the tooth strength of the same tooth width can be improved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, FIG. 1 is a partial perspective view of a shaving cutter, FIG. 2 is a partial perspective view showing another embodiment of the shaving cutter, and FIG. 3 is a partial perspective view of another embodiment of the shaving cutter. Example 1
FIG. 4 is a partial exploded view showing still another embodiment of the shaving saw; FIG. 5 is a partial perspective view showing a conventional shaving cutter; FIG. It is a partial side view explaining uniformity. 1... Cutter body 2... Teeth Piece 3... Forward rotation side cutting blade 4... Reverse rotation side cutting blade,〉Figure 6 above

Claims (1)

[Scope of Claims] 1. A shaving cutter having a plurality of teeth on the outer periphery of the cutter body that mesh with a gear to be machined, wherein the amount of cutting by the cutting edge on the forward rotation side of each tooth piece is determined by the cutting amount on the reverse rotation side. A shaving cutter with a smaller cutting amount than the cutting blade. 2. The shaving cutter according to claim 1, wherein the rake angle of the forward rotation side cutting blade is larger than the rake angle of the reverse rotation side cutting blade. 3. The shaving cutter according to claim 1, wherein the pitch of the cutting blades on the forward rotation side is smaller than the pitch of the cutting blades on the reverse rotation side. 4. The shaving cutter according to claim 1, wherein the land width of the forward rotation side cutting blade is larger than the land width of the reverse rotation side cutting blade. 5. The shaving cutter according to claim 1, wherein the serration movement pitch of the forward rotation side cutting blade is smaller than the serration movement pitch of the reverse rotation side cutting blade.