JPH0698539B2 - Method for removing cutting burrs from gear parts - Google Patents

Description

The present invention relates to a deburring method for gear parts.

(Prior Art) As is well known, there is a case where a cutting tool is slid to form a groove as one of cutting operations by a machine tool.

FIG. 6 shows, as an example of forming the groove by the above-mentioned cutting work, for example, a retainer 1 forming a connecting shell in a transmission mechanism in an automatic transmission used in an automobile. In the retainer 1, A groove 1B for loading a snap ring is formed in a convex portion 1A forming a tooth.

That is, the groove 1B described above is cut in the circumferential direction of the previously formed convex portion 1A, for example, by sliding a cutting tool such as a cutting tool, and specifically, in FIG. Tool for fixed retainer 1 (not shown)
Is moved in the direction of the arrow shown to excavate.

By the way, in the groove formation as described above, in the circumferential direction of the groove 1B, on the side where the cutting tool is separated from the groove 1B,
As shown in the figure, the burr 1C may remain, which may cause the retainer 1 as a processed product to be defective.

Therefore, in order to eliminate such a problem, in the past,
Grooving for moving the cutting tool in the direction indicated by the arrow in FIG. 7 is rough turning, and after finishing this rough turning, the direction opposite to this rough turning direction, specifically, the burr generated by rough turning, is removed. By removing the burr mentioned above by moving the bite in the direction of entering from the end face,
We are finishing the groove.

(Problems to be solved by the invention) However, in the finishing turning as described above,
Although burrs generated in rough turning can be removed, there is a risk that new burrs will be generated on the end surface on the side where the cutting tool comes off during finish turning.

Therefore, in view of the problems in the above-described machining operation, an object of the present invention is to obtain a method for removing cutting burrs of a gear part capable of preventing the above-described burrs from being generated in the stage of finishing turning performed subsequent to rough turning. It is in.

(Means for Solving the Problem) In order to achieve this object, the present invention provides a rotatable process in which a plurality of teeth are formed in a circumferential direction on an inner peripheral surface, and a circumferential groove is formed in the teeth. A method for cutting out burrs generated at an end of a cutting tool used for forming the groove in the circumferential direction of the groove on the side of the object that is separated from the groove, wherein the teeth are arranged in parallel. At the time between the rough turning process in which the cutting tool is moved in one direction to the finish turning process in which the cutting tool is moved in the opposite direction from the rough turning process, the cutting tool is removed during the finish turning. It is proposed to set a chamfering step of forming a sloped surface that expands along the moving direction of the cutting tool by plastic working on the end surface of the groove corresponding to the side.

(Operation) According to the present invention, during finish turning, burrs generated on the end surface on the side where the cutting blade enters will be removed by the blade, and on the side where the blade separates, there will be Since the corresponding surface is distant in the direction in which it does not come into contact with the blade, the sharpening effect of the blade disappears and burr does not occur.

(Examples) Hereinafter, details of the examples of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 is a local perspective view corresponding to FIG. 7 showing a step of a gear part deburring method according to an embodiment of the present invention. The same components as those shown in FIG. 7 are designated by the same reference numerals. .

That is, in the process of this embodiment, firstly, rough turning for forming the groove 1B with the cutting tool is performed by moving the cutting tool in the direction shown in FIG. 1 (A), and the groove 1B is excavated in this step. To be done.

Secondly, the chamfering tool 2 shown in FIG. 2 is used to chamfer the end face 1D opposite to the end face having the burrs 1C in the forming direction of the groove 1B by plastic working.

The chamfer described above is a sloped surface that expands along the moving direction of the cutting tool during the final turning, which is the third step described below.
It is designed to form 1D1.

The chamfering tool 2 used in this chamfering process is, for example,
In order to obtain rotational synchronization with the retainer 1, it has a processing portion 2A arranged in the same phase as the teeth 3A of the master gear 3 incorporated in a gear train that constitutes a drive mechanism different from the drive mechanism for the retainer 1. It has a disk shape.

Then, the processing portion 2A of the tool 2 is set to have a width wider than the width of the groove 1B and a height corresponding to the depth of the groove 1B, and as shown in FIG. 3, the above-described sloped surface 1D1 is obtained. It is said that.

Therefore, as shown in FIG. 4, by pressing the tool 2 against the end surface 1D of the groove 1B, which is opposite to the end surface 1D where the burr is generated, the peripheral edge of the end surface is plastically deformed to form the above-mentioned sloped surface 1D1. To be done.

Then, when the second step is finished, the process moves to the third step. In the third step, as shown in FIG. 1 (C), the direction opposite to the direction in rough turning is applied. Move the cutting tool to remove the burrs generated during rough turning.

That is, in this step, depending on the width and height of the machined portion 2A of the tool 2, the groove 1B is formed as shown in FIG. 5 (A).
It will be excavated again, but bite B is slope 1D1
When reaching, the turning surface abutting against the cutting tool B is no longer continuous, and at this point, chips that are burrs are cut off.

In this state, in the conventional construction method shown in FIG.
At the time when the cutting tool B passes the end surface 1D of the groove 1B, the turning surface corresponding to the cutting tool B is continuous, so some of the chips remain unintegrated and folded back, resulting in burrs. The result is that the action is clearly different from the case where it is likely to remain.

In the above-described embodiment, the tool is combined with the master gear so that rotation synchronization is achieved by matching the phase with the processing portion of the retainer, which is the workpiece, but is not limited to this, and as synchronization control, The NC machine may be used to synchronize the workpiece and the tool. In this case, it is needless to say that the tool side and the workpiece side are different drive mechanisms, as in the case of the above-described embodiment.

(Effect of the Invention) As described above, according to the present invention, the groove is widened along the moving direction of the blade from the burr-generating portion toward the opposite end surface in the peripheral edge of the end surface on the opposite side to the burr-generating portion in the longitudinal direction of the groove. Since the process for forming the sloped surface has been set, when the blade enters from the burr generating part toward the sloped surface, the burr cuts the correspondence between the blade and the surface to be turned by this blade. The relationship can be dropped, which makes it easier to suppress the occurrence of burrs when the blade separates from the opposite end face.

[Brief description of drawings]

FIG. 1 is a process diagram for explaining a deburring method according to an embodiment of the present invention, FIG. 2 is a local perspective view showing a tool applied to the embodiment of the present invention, and FIG. 3 is a reference numeral in FIG. FIG. 4 is a plan view model diagram for explaining the relationship between the machined portion and the groove portion on the side to be machined in the tool shown in FIG. 3, and FIG. FIG. 6 is a model diagram for explaining the operation of the tool shown in the figure, FIG. 6 is a perspective view showing an example of a workpiece to which the tool is applied, and FIG. 7 is an enlarged perspective view of a portion indicated by reference numeral VII in FIG. Is. 1 ... Retainer which is a workpiece, 1A ... Tooth, 1B ... Groove, 1C
…… Burr, 1D …… End face on the side opposite to the burrs end face, 1D1…
… Sloping surface, 2 …… Tool, 2A …… Processing part, B …… Bite.

Claims (1)

[Claims] 1. A rotatable work piece having a plurality of teeth formed in a circumferential direction on an inner peripheral surface thereof and grooves formed in the teeth in the circumferential direction, the grooves being formed in the circumferential direction of the groove. A method for cutting burrs generated at the end on the side where the cutting blade used for cutting away from the groove is provided, which is a rough turning step of moving the cutting blade in one direction along the direction in which the teeth are arranged. At the time of transitioning to the finishing turning process in which the cutting tool is moved in the opposite direction from the time of this rough turning,
At the time of finishing turning, a chamfering step of forming a sloped surface that expands along the moving direction of the cutting blade by plastic working is set on the end surface of the groove corresponding to the side from which the cutting blade detaches. Method for removing cutting burrs from gear parts.