JPS6039023A - Plunge cut shaving cutter - Google Patents

Abstract

PURPOSE:To make a cutting amount in both acting and counteracting faces of each tooth in a work gear so as to become almost equal, by consituting a total cutting front range of all cutting edges at the acting face side of each cutter tooth so as to make it larger than the total cutting front range of all cutting edges at the counteracting face side. CONSTITUTION:A cutting front range T'b of each cutting edge Zb at the side of an acting face (b) in each cutter tooth Z is constituted so as to be larger than a cutting front range Tc of each cutting edge Zc at the side of a counteracting face (c). With a cutting edge form being constituted as abovementioned, the total sum of the front range T'b is able to make larger than the total sum of the front range Tc of each cutting edge Zc at the side of the counteracting face (c) so that face pressure against the acting face of each tooth of a work gear on the cutting edge at the acting face side grows larger than the face pressure against an acting face W2 on a counteracting face side cutting edge Zc. With this constitution, an infeed stroke at the acting face side of a work gear W and an infeed stroke at the counteracting side both are made possible to be equalized.

Description

DETAILED DESCRIPTION OF THE INVENTION ■-Optical I-1 The present invention relates to a plunge cutter 1-shaving cutter for performing plunge cut shaving.
This relates to the shape and arrangement structure of cutting edges formed on both sides of each cutter tooth.

As is well known, there are conventional shaving, diagonal shaving, underpass shaving, plunge cut shoe pink, etc. in the shaving method. It is said that the ping method has the most efficient processing power and is suitable for processing maternity teeth.

As is well known, this plunge cut shaving method is
Shaving is performed only by movement of the cutter in the radial direction of the gear to be cut, without requiring relative lateral feed between the gear to be cut and the cutter. The specific working method of this plunge cut shaving method is as follows.

That is, as shown in FIG. 3, the plunge cutter 1 to the shaving cutter S continuously rotate in the direction of the arrow shown in the figure with respect to the width W of the workpiece L'a supported so as to freely rotate.
Rough cutting is performed by making a cut, and when this rough cutting is completed, the cutter S is returned to the workpiece gear W by a very small amount to reduce the elastic deformation of the machined part of the INOC workpiece gear W. Then, the cutter S is reversed (, 1-up cutting is performed).

By the way, in this plunge cut [-pink method], the cutting amount by rough cutting is 90% or more of the total cutting amount, that is, the sum of the rough cutting amount and the finishing cutting amount. In other words, in this shaving method, the shaving pressure applied to the gear to be cut is not excessive at any time when the cutter S is cut by rotating in one direction, and the reverse cutting of the cutter S is only a correction work.

As shown in FIG. 2, each cutter tooth Z of the cutter S has a plurality of cutting edges Zi, 7a on both sides 1) and C, respectively. It is called the action surface, and the opposite surface is called the reaction surface. Therefore, in the plunge cut shaving cutter S, the cutter S
Since the gear W to be cut is machined by rotation in one direction, the roles of the tooth surfaces A and C of each cutter tooth 7 are clearly distinguished. That is, in FIG. 3, cutter S
The tooth surface 1) on the rotation direction side becomes the action surface, and the opposite tooth surface C becomes the reaction surface.

In the shaving method other than the plunge cut shaving method, the roles of both tooth surfaces of each tooth of the cutter are not clearly distinguished as described above. In the other shaving methods mentioned above, the cutter is cut into the workpiece gear by 1 C/, 1 (with the forward rotation of the cutter) φ rotation h ~ alternating H i
It's starting to get worse. Therefore, the J tooth surface that forms an action surface during forward rotation forms a reaction surface during reverse rotation.

As described above, in the plunge cut shaving method, due to the above-mentioned special circumstances, there is a problem that the distance between cuts is different on both sides of each tooth Z of the gear W to be cut. This state is shown in FIG. That is, the cutting depth fM of the working surface W1 of the tooth 7 cut by each cutting edge of the working surface 1) of the cutter tooth 70? l, that is, the cut product is [, and on the other hand, the cutting depth 51 of the tooth surface W2 cut by each cutting edge 7G of the force vine south 70 and the reaction force C, that is, the cutting amount is f (<
F). In this way, the reason why the cutting product differs between the working surface Wl and the reaction surface W2 of each tooth Z of the gear W to be cut is that the pressing force of each cutting edge zb of the cutter tooth Z on the working surface W1 is different from that of each tooth Z of the cutter tooth Z. The reason for this is that it is larger than the pressing force applied to the reaction surface W2 of the tooth zC. In Sen's shaving method, even if such a small cut occurs due to one revolution of the cutter, it is not a problem as it is corrected by the next reversal of the cutter, but with the plunge cut shaving method, such correction is extremely difficult. It's a problem because it's small. In particular, the step D1 on the working surface side formed at the bottom of each tooth l of the gear W to be cut
The step D2 on the reaction surface side becomes unbalanced and this becomes a big problem.

By the way, each cutting edge Zb on the working surface 1) side and the reaction surface C side of each cutter tooth Z of plunge cut shaving S,
Analyzing the shape and arrangement of Zc reveals the following.

That is, this is extremely common sense in the plunge cut shaving method, but as shown in FIG.
The shapes and arrangement structures of C are exactly the same.

That is, the cutting surface width Tb of the cutting edge Z 115- and the cutting front width TC of the cutting edge ZC are exactly the same dimension, and the big width Pb between each cutting edge zb on the working surface side and the large width Pb on the reaction surface C side The pitch width []O between each cutting edge 7c is exactly the same. In other words, regarding the cutting edge shape and cutting edge arrangement, the action surface i side and the reaction surface C
Since the two sides are exactly the same, it can be seen that the difference in the depth of cut on both sides of each tooth 2 of the gear W to be cut as described above cannot be avoided.

[1]11 Therefore, the technical problem to be solved by the present invention is to change the shape of the cutting blade of the plunge cut shaping cutter or the arrangement structure of the cutting blade on the action surface side and the reaction surface side, thereby improving the shape of the gear to be cut. The aim is to make the amount of cut on both sides of each tooth equal.

11 animals 11 Fuinenichi et al. focused on the fact that the amount of cut of each cutting blade into the gear to be cut is related to the blood pressure of each cutting blade to the south face of the gear to be cut. In other words, as this blood pressure increases, the cutting resistance increases, and therefore the cutting resistance decreases.

Based on the above idea, the present invention was constructed as follows in order to solve the above technical problem.

In other words, the total cutting front width of all cutting edges on the working surface side of each cutter tooth is larger than the total S1 cutting front width of all cutting edges on the reaction surface side.
The surface pressure of the cutting edge on the working surface side against the tooth surface of the gear to be cut is reduced by 1 m of the cutting edge on the reaction surface side.
The surface pressure was greater than the surface pressure on the i1fii surface, so that the depth of cut, that is, the amount of cutting, on the action and reaction surfaces of each tooth of the tooth width to be cut was made to be approximately the same.

The above configuration can be achieved by the following two methods.

One of them focuses on the tooth shape of each cutting edge,
The cutting front width of each cutting edge on the working surface side is made larger than the cutting front width of each cutting edge on the reaction surface side.

The second manual removal method focuses on the arrangement structure of the cutting blades, and is to make the pitch width between the cutting blades on the working surface side smaller than the pitch width between the cutting blades on the reaction surface side.

- No matter which method is used in Section V, the general cutting front width of all the cutting edges on the working surface side can be greater than the total cutting front width of all the cutting edges on the reaction surface side by 81 points.

The present invention will be specifically described below with respect to each embodiment illustrated in FIG. 6.7. Incidentally, the same members as those in FIG. 5 showing the conventional example are given the same reference numerals.

First, a first embodiment will be explained based on FIG. 6.

As shown in the figure, each cutting edge z on the working side of each cutter tooth 70
The cutting edges ZC on the side b and the reaction surface C have mutually different shapes. That is, the cutting front width T'b of the cutting edge zb is configured to be larger than the cutting front width TCJ of the cutting edge ZC. In this embodiment, each tooth zb on the working surface i side
The pitch width pH and the pitch width pc between each cutting edge 70 on the reaction surface C side are the same.

By configuring the cutting edge shape as described above, the total cutting front width T'b of all the cutting edges zb on the working surface side can be calculated as the reaction surface C.
It can be made larger than the total cutting front width TO of each cutting edge ZC on the side, and therefore, the surface pressure on the working surface of each tooth of the to-be-cut gear of the cutting edge on the working side is equal to the working surface W2 of the cutting blade on the reaction side ZO. Therefore, it becomes possible to equalize the cutting group on the working surface side and the cutting group on the reaction surface side of the gear W to be cut. Conversely, the cutting front width T'1 of the cutting edge zb
) and the cutting front width Tc of the cutting blade ZG are set so that the cutting heights of the working surface W1 and the reaction surface W2 of each tooth Z of the gear W to be cut are equal.

Next, a second embodiment will be explained based on FIG. 7.

This embodiment is characterized in that the pitch width of each cutting edge is made different between the action surface side and the reaction surface C side. That is, in this embodiment, the cutting front width Th of the working surface side cutting edge Z 11 and the cutting front width TO of the reaction surface side cutting edge 7C are
are completely equal, but on the other hand, the pitch width P'11 between the teeth on the side of the working surface is smaller than the pitch width pc between the cutting edges on the side of the reaction surface C. Therefore, even with this method, the total cutting front width of all the cutting edges on the working surface side 9- is larger than the total cutting front width of all the cutting edges on the reaction surface C side, and as in the first embodiment, You can achieve your intended purpose.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a shaving cutter attached to plunge cut 1, Fig. 2 is an enlarged perspective view showing one cutter tooth of the cutter in Fig. 1, and Fig. 3 is a state in which the workpiece tooth width and the cutter are in mesh with each other. FIG. 4 is an explanatory diagram showing the difference between the cutting depth of the working surface of the tooth of the workpiece gear and the cutting depth of the reaction surface, and FIG. 5 is the cutting edge on the working surface side of the cutter tooth and the reaction surface in the conventional example. Explanatory diagrams showing the shape and arrangement structure of the face-side cutting edge, Nos. 6 and 7
Each figure is an explanatory diagram similar to FIG. 5 showing an embodiment of the present invention. S... Plunging cutter, W...
・Workpiece gear, Z... cutter tooth, l... tooth of workpiece tooth width, zb... cutting edge on the working surface side, ZC... cutting edge on the reaction surface side, b... working surface, C... Reaction surface, Wl... Action surface, W2... Reaction surface, F, f... Cutting amount, D
+, D2...step, Tb, Tc, T'h...
Cutting front width, Pl). 10-pc, p't]...Pitch width. Patent applicant Kobe Steel, Ltd. agent Patent attorney Aoshiro Aoba and 2 others 11- 142-

Claims (3)

[Claims] (1) A "lunge cut shaving power vine" characterized in that the total cutting front width of all the cutting edges on the working surface side of the cutter teeth is larger than the total cutting front width of all the cutting edges on the reaction surface side. (2) The plunge cut shaving cutter according to item 1, wherein the cutting front width of each cutting blade on the working surface side is larger than the cutting front width of each cutting blade on the reaction surface side. (3) The plunge cutter 1 to shaving cutter according to item 1, wherein the pitch width between the cutting blades on the working surface side is smaller than the pitch width between the cutting blades on the reaction surface side.