JPH0748341Y2 - Deburring tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a deburring tool.

(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 milling cutter, and specifically, in FIG. 7, the fixed retainer 1 is fixed. On the other hand, the groove 1B is excavated by moving a groove mill (not shown) in the direction of the arrow shown.

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

Therefore, in order to eliminate such a problem, in the past,
After finishing the groove processing, for example, a finishing operation for removing burrs may be performed by scraping or the like.

(Problems to be solved by the invention) However, the above-described finishing process often depends on manual work, and there is a problem that work efficiency is extremely low, and the finish state may not be uniform. There is

Therefore, an object of the present invention is to obtain a tool for finish machining capable of removing burrs automatically and in a uniform state in view of the above-mentioned problems in machining work.

(Means for Solving the Problem) In order to achieve this object, the present invention provides a groove for a rotatable work piece in which a circumferential groove is formed in a plurality of teeth arranged in the circumferential direction of an inner peripheral surface. The cutting edge of the rotating cutting blade for forming is a tool for cutting off a burr generated at the end of the groove on the side of separation when separating from the tooth, and the center of rotation of the workpiece. A master gear that has a rotation center axis arranged on a line orthogonal to the axis and has a pitch circle radius that is in contact with the pitch circle of the workpiece and is smaller than the pitch circle radius of the workpiece, and meshes with the workpiece and rotates synchronously. , Having a plurality of blade portions that are provided integrally with the master gear and are arranged in the same phase as the positions of the teeth of the workpiece, and set the distance from the rotation center of the master gear to the blade edge of each blade portion in stages. And a deburring blade formed by differently It is characterized by having.

(Operation) According to the present invention, the same movement amount is obtained by moving the groove end portion of the tooth portion of the workpiece along the movement locus along which the blades having the gradual cutting edge length follow the toroidal locus. Therefore, a continuous scraping surface can be obtained.

(Embodiment) Hereinafter, the details of the embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a diagram for explaining the operating principle of the tool 10 (see FIG. 3) according to the embodiment of the present invention.
Master gear 11 with integrated tool 10 (see Fig. 3)
The rotation center A of the retainer 12 is the work piece in this case.
It is set at a position where the radius of rotation of the pitch circle that coincides with the center of rotation B (see FIG. 5) on the center line is reduced by about 40%. The master gear 11 described above is provided to obtain rotational synchronization with the retainer 12, and is incorporated in a gear train that forms a drive mechanism different from the drive mechanism for the retainer 12.

Then, the pitch circle on the center line of the master gear 11 in which the center of rotation is set as described above (shown by a chain double-dashed line in the figure) and the pitch circle of the retainer 12 (shown by a one-dot chain line in the figure) match each other. When a locus at a position corresponding to a small position a, a matching position b, or an exceeding position c with respect to the radius of gyration is obtained with reference to the position, one point on the circumference rotates as shown in FIG. While making a reciprocating motion, it forms a trochoid.

Therefore, the blade portion 10A of the tool 10 in this embodiment is arranged so as to move along this locus.

That is, in the tool 10 of this embodiment, as shown in FIGS. 3 and 4, the blade portion 10A is arranged in the same phase as the teeth 11A of the master gear 11, and each blade portion 10A is The distance R from the center of rotation to the cutting edge is adjacent so that the width is wider than the width of the groove 12B formed in the tooth 12A of the retainer 12 and corresponds to the stepwise position with respect to the entire depth of the groove 12B. For the blade portion 10A, reference numeral R in FIG. 3 and FIG.
They are graded as shown by 1, R2, and R3.

In the case of the present embodiment, the above-mentioned steps are set to three steps, and the difference in distance within the steps is set to the relationship of R1>R2> R3.

Therefore, each of the above-described blade portions 10A is positioned and corresponds to a stepwise portion in the entire depth direction of the groove 12B for deburring.

Since the present embodiment has the above structure, the master gear 11
By setting the synchronization between the drive mechanisms so as to synchronize with the rotation of the retainer 12, the teeth 12A of the retainer 12 and the teeth 11A of the master gear 11 are in the same state as meshed with each other.

Then, when the tool 10 faces the burring end of the groove 12B in the retainer 12 in a state where the teeth of the master gear 11 and the retainer 12 are in phase with each other, as shown in FIG. Each blade portion 10A in 10 as it rotates, sequentially along one burring end, moves along a trochoidal locus at a stepwise position, and is the same as performing the corresponding processing at the burring end by scraping. By setting the state, the generated burr is scraped off.

In other words, the blade 10 that moves the trochoid at each step position
The burr-generating end portion of the groove 12B corresponding to A is continuously subjected to burr cutting by the blade portion 10A which sequentially arrives with the same feed amount.

Therefore, when such burr cutting is performed, the burr generation end portion, so-called, the side end surface of the groove 12B is continuous over the entire side end surface described above even though the blade portion 10A moving in a stepwise position is stepwise. The burr is removed.

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 distance to the cutting edge of the workpiece is changed stepwise, and the movement locus of each blade is set in a trochoidal shape. With the feed amount, it is possible to obtain the same state as when the burrs surface is continuously scraped, and by this, automatically and
The burr can be removed uniformly, and the finish workability can be improved.

[Brief description of drawings]

1 and 2 are diagrams for explaining the operating principle of the tool according to the embodiment of the present invention, FIG. 3 is a local perspective view showing the tool according to the embodiment of the present invention, and FIG. 4 is shown in FIG. FIG. 5 is a partial plan view of the tool shown, FIG. 5 is a model view for explaining the action of the tool shown in FIG. 3, and FIG. 6 is a perspective view showing an example of a workpiece to which the tool is applied. The drawing is an enlarged perspective view of a portion indicated by reference numeral VII in FIG. 10 …… Tool, 10A …… Blade, 11 …… Master gear, 11A ……
Tooth, 12 ... Retainer that is a workpiece, 12A ... Tooth, 12B ...
Groove, R1, R2, R3 ... Distance from the center of rotation of the tool to the cutting edge.

Claims (1)

[Scope of utility model registration request] 1. A cutting edge of a rotating cutting tool for forming a groove of a rotatable work piece in which a circumferential groove is formed in a plurality of teeth arranged in a circumferential direction of an inner peripheral surface, A tool for cutting off burrs formed at the end of the groove on the side of detachment when detached from the workpiece, the rotation center axis being arranged on a line orthogonal to the rotation center axis of the workpiece, and A master gear that is in contact with the pitch circle of the workpiece and has a pitch radius smaller than that of the workpiece, and meshes with the workpiece and rotates synchronously; Having a plurality of blades arranged with the same phase as the position,
A deburring tool, comprising: a deburring blade formed by gradually changing the distance from the center of rotation of the master gear to the blade edge of each blade, and a deburring tool.