JPH02124211A - Groove cutting for toothed parts - Google Patents

Abstract

PURPOSE:To prevent faulty operation in toothed parts by milling burrs produced in the first cutting process from the reverse direction to remove the burrs when a clutch retainer inside a car automatic transmission is machined to form a snap-ring groove. CONSTITUTION:In the first cutting process, the groove 13 of each tooth 12 of a toothed part 10 such as a clutch retainer, etc., is cut from one side in the circumferential direction by turning the first cutting edge 19. The first cutting edge 19, revolving along a revolving locus smaller sufficiently in diameter than the pitch circle of the toothed part 10, starts to cut in an encountered tooth 12 from one side tooth face f1 and cut out toward a tooth crest f2 side. In this case, burrs are produced on the tooth crest f2 only and not produced on the other tooth face f1. When each tooth, for which its groove must be further machined, is cut in the direction reverse to that in the first cutting by a second cutting edge FC, in the second cutting process, the burrs NG on the tooth crest are removed and new burrs are prevented to be produced in the second cutting process.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a method for grooving a toothed part in which grooves are cut along the circumferential direction in the teeth of the toothed part 8 (Prior Art) Toothed Part 1 For example, in a clutch retainer in an automatic transmission of a car, meshing teeth are sequentially provided at a certain pitch on the inner circumferential surface of the clutch retainer. A groove is formed along the line, and a snap ring or the like that locks the clutch plate is fitted into this groove.

For example, as shown in FIG. 6, the latch retainer 1 is first formed by pressing or the like so that meshing teeth 2 are sequentially curved at a predetermined pitch on the inner circumferential surface of the latch retainer 1. groove 3 in the inner circumferential direction using
is machined.

(Problem to be solved by the invention) By the way, in the groove machining as mentioned above.

When the groove 3 is cut in the circumferential direction A, as shown in FIG. 7, burrs 4 are often generated on the side where the milling cutter leaves the groove. This burr 4 causes problems by reducing the accuracy of the mounting position of the snap ring installed in the groove and causing failure due to abnormal operation of members inside the clutch retainer.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for grooving toothed parts that can prevent the occurrence of flashing.

(Means for solving problems) In the method for grooving a toothed component according to the present invention, a plurality of teeth are sequentially formed at a predetermined pitch in the circumferential direction, and each tooth is The cutting edge is recessed and cuts a groove along the circular layer direction, and in particular, it is integrally attached to the first rotation axis parallel to the rotation axis of the toothed part and the tooth a first cutting step of rotatably cutting only one side in the circumferential direction of the grooves of each of the teeth using a first cutting blade that rotates along a rotation locus that is sufficiently smaller than the pitch circle of the attached part; The present invention is characterized in that a second cutting step is performed in which the grooved portion left on each tooth is cut by a second cutting blade in a direction opposite to the cutting direction in the first cutting step.

(Function) In the first cutting step, the groove of each tooth is cut only in one stroke in the circumferential direction of the toothed part by the first cutting blade in the J@th rotation. At this time, the first cutting blade, which rotates along a rotation locus that is sufficiently smaller than the pitch circle of the toothed part, enters the cut from the flank of one of the opposing teeth and cuts upward toward the tooth tip. In this case, pars occur only on the cutting edge surface and not on the other tooth surface. Therefore, in the second cutting process, when the grooved portion left on each tooth is cut with the second cutting blade in the opposite direction to the cutting direction in the first cutting process, the pars on the tooth tips are removed, and the grooves left on each tooth are removed. The generation of new flakes in the second cutting process is prevented.

(Example) FIG. 1 shows a process diagram of a method for grooving a toothed part according to the present invention. The toothed part here is the clutch retainer 1 in the automatic transmission of a car similar to the one shown in Section 6.
0, which has a deep dish shape with one end open and the other end closed with a vertical wall 11, and the inner peripheral surface has a mesh with the direction of the rotation center line Q being the drawing book direction. 12 are sequentially formed in the circumferential direction A at predetermined pitches P. Each of the meshing teeth 12 has a groove 13 cut from its tip surface along the circumferential direction A.
This groove 13 is formed by a first groove cutting device 14 shown in FIGS. 2, 3, etc., and a well-known second groove cutting device (not shown).
It is obtained by sequential processing.

: First, the seventh groove cutting device 14 will be explained.

This first grooving device 14 integrally inspects the clutch retainer 10 and rotates at a predetermined level by a motion source (not shown).
The workpiece rotating shaft (which is rotated N1) 5 and this rotating shaft 15
a first rotating shaft 16 which is disposed parallel to and opposite to and rotates at a predetermined rotational speed +v2 by an unillustrated motion source; a work fixing means 17 which fixes the clutch retainer 10 to the work rotating shaft 15; Cutting blade fixing means 1 on rotating shaft 16
8, and a first cutting blade 19 fixed by 8.

[Work fixing means] 7 is inserted into the boss 101 of the clutch retainer 10 at the tip of the work rotating shaft 15, and then
01 is configured to be fixed by tightening.

The cutting blade fixing means 18 is achieved by setting the first cutting blade 19 in a fixing groove 20 formed in the tip of the first rotating shaft 16, inserting a wedge 21 thereon, and tightening the wedge with a clamp screw 22. It is configured to fix the first cutting blade 19.

Here, it is assumed that both shafts Is, 16 are rotated in the same direction, and furthermore, the work rotation shaft 15, that is, the clutch retainer 10
of the first rotating shaft 16. That is, when the ratio of the rotational speed N2 of the first cutting blade 19 is set to the number n of meshing teeth 12 of the clutch retainer 10 (N2/N1=n), one rotation of the first cutting blade 19 causes the clutch retainer to rotate. It is possible to synchronize the cutting of the ten meshing teeth 12 one by one. However, when the diameter DW of the clutch retainer 10 and the diameter DC of the rotation locus of the cutting edge of the first cutting blade 19 are DC=DW/N, the circumferential speed of the workpiece=the circumferential speed of the cutter. Cannot be processed. In order to prevent this, it is preferable that DC>2D/N,
shall be set as follows.

Here, grooving of the clutch retainer 10 will be explained. In this case, first, the latch retainer 10 is attached to the first groove cutting device 14, the work rotation shaft 15, that is, the clutch retainer 10 is rotated at the rotation speed N1, and the first rotation shaft 16,
That is, the first cutting blade 19 is rotated at the rotation speed N2. As a result, the first cutting blade 19 rotates along a rotation locus consisting of a substantially circular arc sufficiently smaller than the pitch circle SP, and cuts into each of the meshing teeth 12 as shown in FIG. 3. This incision is made by meshing (from the front side of the tooth surface f1 to the tooth tip surface f2).
It is possible to achieve a process of cutting up to the center of the As a result, a part of the groove is formed in the front half of the tooth surface f1 in each meshing tooth 12, and a gap NG occurs in the center of the tooth tip surface f2.
The first cutting process is completed.

Note that the configuration of the first cutting blade 19 may be changed as shown in FIG. 5t. That is, prior to cutting into the first tooth, the rear end of the tooth tip surface f2 of the blade on the near side is slightly cut off, and the first cutting blade 19 is cut away from the front side f1 of the tooth surface of the meshing tooth. It is set so that it stands up at the rear end of the tooth tip surface f2. Thereby, there is an advantage that part or most of the paring NG that has occurred at the rear end of the tooth tip surface f2 can be eliminated in the first cutting process.

Subsequently, the clutch retainer lO that has undergone the first cutting process is set in a milling machine (not shown) as a well-known second grooving device, and the meshing teeth 12 that have been processed in the first cutting process are removed.
Cutting is started on the unmachined part that continues from a part of the groove cut upward from the front side f1 of the tooth surface to the center of the cutting edge surface f2. In this case, the milling cutter FC as the second cutting edge (see Fig. 1)
is used, the tooth width of which is equal to that of the first cutting edge 19. Note that depending on the situation, a single-sided cut of about 0.1 m may be made.

Further, in the second cutting step, cutting is performed by the milling cutter FC from the opposite direction to the cutting direction in the first cutting step, that is, from the rear side f3 of the tooth surface of the meshing tooth 12.

In this second cutting step by the milling machine, the paring NG on the tooth tip surface f2 of each meshing tooth 12 is removed, and the groove 1 cut in the opposite direction to the cutting direction in the first cutting step is removed.
In No. 3, no parry NG occurred in any of the etched portions.

(Effects of the Invention) As described above, according to the method of the present invention, in the first cutting step, each tooth is cut from one tooth surface side and cut upward toward the tooth tip surface side, and the second In the cutting process, the grooved portions left on each tooth are cut in a direction opposite to the cutting direction in the first cutting process. For this reason, it is possible to remove the burrs generated during the first cutting process in the second cutting process, and also to prevent the generation of new burrs, prevent malfunctions inside the toothed parts, and prevent malfunctions caused by this. This also improves the mounting accuracy of internally mounted members.

[Brief explanation of drawings]

Fig. 1 is a process diagram of the method of the present invention, Fig. 2 is a side sectional view of the first grooving device used in the method of the present invention, and Fig. 3 is a sectional view of the first grooving device used in the method of the present invention.
A front sectional view of the cutting device, FIG. 4 is an explanatory diagram of the operation of the first grooving device same as above, FIG. 5 is an explanatory diagram of the operation of the first grooving device used in other embodiments, and FIG. 6 is a diagram of the operation according to the conventional method. FIG. 7 is a perspective view of the clutch retainer to be processed, and is an enlarged view of the portion indicated by the symbol X in FIG. 6. 12... Teeth, 13... Groove, 10... Clutch retainer, 15... Work rotation shaft, 16... First rotation shaft, 19... First cutting blade, A... Circumferential direction, PS...pitch circle. P...Pitch, FC...Milling.

Claims (1)

[Claims] Grooving of a toothed part in which a plurality of teeth are sequentially formed at a predetermined pitch in the circumferential direction, and a groove is cut in the cutting edge of each tooth and along the circumferential direction. In the method, a first rotating shaft is integrally attached to a first rotation axis parallel to the rotation axis of the toothed component and rotates along a rotation locus that is sufficiently smaller than a pitch circle of the toothed component.
A first cutting step of rotating and cutting only one side in the circumferential direction of the grooves of each tooth using a cutting blade, and cutting the grooved portion left on each tooth in the first cutting step. A method for grooving a toothed component, characterized by performing a second cutting step of cutting with a second cutting blade from the opposite direction.