JP2000246352A - Censoring flange part processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a fitting face accuracy nearby a censoring flange part good and eliminate the need for a machining work when censoring C surface processing is performed. SOLUTION: With reference to a censoring flange part processing method wherein an axial direction one end of a cylindrical part 6 is pressurized and bent in a diameter direction, with a bottom face 72 of an upper die punch 156 for processing a flange part 7, a protruded part 91 is provided with the upper punch bottom face 72 for working the flange part 7 by binding it in the diameter direction with the protruded part 91. Since the flange part 7 becomes to a desired shape, not becoming in a sagging shape, a fitting face 71 accuracy nearby the flange part 7 becomes good and the need for a machine work is eliminated even when a C surface 17 processing is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing a flange of a rotation detecting sensor ring.

[0002]

2. Description of the Related Art In general, a sensor ring is used for detecting the rotation of a rotating member such as an axle of an automobile, and is press-fitted to a stepped portion of the rotating member. The distal end of the sensor ring in the press-fitting direction is abutted against the stopper surface of the rotating member, thereby positioning the sensor ring in the axial direction.

[0003] In the stepped portion of the rotating member, there is a round surface corresponding to the nose radius of the cutting tool between the fitting surface and the stopper surface. If the sensor ring tip hits the round surface before hitting the stopper surface, the axial position and flatness of the sensor ring become unstable.

Accordingly, the present applicant has previously proposed a sensor ring provided with a flange portion capable of avoiding a round surface and a method of manufacturing the same (Japanese Patent Application No. 10-56771, hereinafter referred to as a prior application).
According to this, since the flange portion surely hits the stopper surface, the axial position and the flatness of the sensor ring are extremely stabilized.

[0005]

When the flange portion is bent in the prior application, an inclined surface of the mold is provided inside the corner of the bent portion. There is a problem that the accuracy of the fitting surface of the ring cylindrical portion is deteriorated. That is, if the inclined surface is relatively large, the bending is slightly performed, the linearity of the fitting surface near the flange portion is impaired, and the C surface on the inner periphery of the flange portion is also rounded.

[0006] As a countermeasure, it is conceivable to eliminate the inclined surface. However, in this case, the bending is performed in a forged state, which leads to an increase in molding load and insufficient mold strength.

There is also a method of machining the C plane to make it flat, but this leads to an increase in cost. This is because the sensoring of the prior application is characterized by being easily made only by press working.

[0008]

According to the present invention, there is provided a method for processing a flange portion of a sensor ring, comprising pressing an axial end of a cylindrical portion with a lower surface of an upper die punch and bending the flange in a radial direction to form a flange portion. In the above, a projection is provided on the lower surface of the upper die punch,
The flange is processed while being constrained in the radial direction by the projections.

According to this, since excessive radial movement of the flange portion is prevented, it is possible to prevent the accuracy of the fitting surface from deteriorating.

Here, it is preferable that the cylindrical portion is radially held by a movable die and a backup member is slidably inserted between the movable die and the fixed member before machining the flange portion.

The present invention also relates to a method for processing a flange portion of a sensor ring, wherein one end in the axial direction of a cylindrical portion is pressed by the C surface and the lower surface of an upper die punch, and bent radially outward to process a flange portion. Then, a projection is provided on the lower surface of the upper die punch,
Processing is performed while pressing the flange portion against the outer peripheral surface and the C surface of the upper die while restraining the flange portion from the radial outside.

Here, before machining the flange portion, the cylindrical portion is held by a movable die from the outside in the radial direction, and the upper die is interposed between the movable die and a fixing member located radially outside the movable die. It is preferable that the backup member is slidably inserted in conjunction with the lowering of the punch.

[0013]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the sensor ring 1
Is mounted coaxially to the hub 2 of the car axle, here a rotating member. The hub 2 is formed in a substantially cylindrical shape centered on the axis C, and its outer peripheral portion is formed in a step shape to form a fitting surface 3 and a stopper surface 4 respectively. The fitting surface 3 is a circumferential surface having a predetermined outer diameter, centered on the axis C,
It is extended a predetermined length in the axial direction. The stopper surface 4 is an annular flat surface perpendicular to the fitting surface 3 and continuously extending radially outward from the fitting surface 3. The fitting surface 3 and the stopper surface 4 are formed with high precision by mechanical cutting, but a round surface 5 corresponding to the nose radius of the cutting tool is formed at the connection between the surfaces 3 and 4. Becomes

The sensor ring 1 is formed in an annular shape as a whole, and is press-fitted to the outer peripheral side of the fitting surface 3 from above in FIG. An axial relative position is defined.
That is, the sensor ring 1 has a cylindrical portion 6 press-fitted into the fitting surface 3 and a front end portion of the cylindrical portion 6 in the press-fitting direction bent outward in the radial direction. And a flange portion 7 to be brought into contact with the body.

The rear end of the sensor ring 1 in the press-fitting direction is radially outwardly folded back into a U-shape in cross section, whereby the sensing portion 8 extending radially outward from the rear end of the cylindrical portion 6 in the press-fitting direction. And an outer peripheral ring portion 9 extending forward from the outer peripheral end of the sensing portion 8 in the press-fitting direction.
Each of these parts is formed by appropriately pressing or bending a metal plate material having a predetermined thickness, in this case, an SPHC material by a method described later.

The sensing portion 8 is a portion used for rotation detection, and has a plurality of rectangular holes 10 pierced at equal pitches over the entire circumference. This sensing part 8
1, a web 11 (teeth) between the rectangular holes 10 is detected by installing a proximity sensor such as a magnetic sensor above and near the sensing unit 8 in FIG. Can be detected.

As shown in detail in FIG. 3, the rectangular hole 10
The radially inner end surface 12 substantially matches the position of the outer peripheral surface 13 of the cylindrical portion 6, and the radially outer end surface 14 substantially matches the position of the inner peripheral surface 15 of the outer ring portion 9. That is, the radial width Wr of the rectangular hole 10 is substantially equal to the distance between the outer peripheral surface 13 and the inner peripheral surface 15, the distance Wr ₁ between the radial inner end surface 12 and the cylindrical outer peripheral surface 13, and the radial outer end surface. interval Wr ₂ between 14 and outer ring portion inner circumferential surface 15 are respectively small value (here 0.2mm or less).

As described above, the width Wr of the rectangular hole 10 is
3 and the distance between the inner peripheral surface 15 and the inner peripheral surface 15. Rectangular hole 1
Since some flesh is left inside and outside in the radial direction of 0, rigidity can be improved. The rectangular hole 10 has a rectangular shape whose radial width Wr is longer than the circumferential width Wh. The ratio of the circumferential width Ws of the web 11 to the circumferential width Wh of the rectangular hole 10 is 0.1.
75 or less.

Here, if there is no outer ring portion 9,
The web 11 (teeth) protrudes from the cylindrical portion 6 in a comb shape, and the rigidity of the sensing portion 8 becomes extremely weak. Here, since the outer peripheral ring portion 9 is provided, the webs 11 are connected to each other, the rigidity of the sensing portion 8 is increased, and the flatness of the sensing portion 8 can be extremely stabilized. Note that the length of the outer peripheral ring portion 9 in the axial direction or the press-fitting direction is considerably shorter than that of the cylindrical portion 6.

On the other hand, as shown in FIGS. 1 and 2, the flange portion 7 is inclined in a C-shape as a whole with respect to the axial direction of the sensor ring 1. Then, after the sensor ring 1 is press-fitted, the stopper ring 4 comes into contact with the stopper surface 4 at a position radially outside the round surface 5, avoiding the round surface 5 of the hub 2. Here, a contact surface 16 having a minute radial length is provided at the front end of the flange portion 7 in the press-fitting direction.
Are formed over the entire circumference. That is, the flange portion 7 is brought into surface contact with the stopper surface 4 by the annular contact surface 16.
The inner peripheral surface of the flange portion 7 is a C surface 17 having a linear cross section,
Press molding is performed by a method described later. The C surface 17 can avoid the round surface 5, and conversely, the C surface 17
The dimensions C ₁ and C ₂ (see FIG. 12) are values that are large enough to avoid the radius surface 5.

As described above, the provision of the flange portion 7 allows the sensor ring 1 to reliably contact the stopper surface 4 while avoiding the round surface 5, whereby the axial position of the sensor ring 1 can be accurately determined. Thus, the sensing unit 8 can be accurately positioned at a predetermined position.

Further, even when the press-fitting is performed with a high load or impact, the front end of the cylindrical portion 6 in the press-fitting direction is made highly rigid by the flange portion 7. Can be prevented from being deformed. Accordingly, the axial length Hp of the sensor ring 1 can be prevented from being shortened, and the axial position of the sensing portion 8 with respect to the sensor ring 1, particularly the stopper surface 4, can be made accurate and stable.
In particular, the flatness of the sensing unit 8 can be kept good.

The rigidity of the entire sensor ring 1 can be increased by the flange portion 7, and the deformation of the sensing portion 8 during press fitting can be prevented.

Further, by providing the contact surface 16, the contact area can be increased, the load at the time of collision can be dispersed, the deformation can be further prevented, and the axial position of the sensing section 8 can be made more accurate and stable. The flatness can also be kept better. The flatness of the contact surface 16 with respect to the sensing portion 8 can be easily maintained at high accuracy by press molding described later.

The sensor ring 1 is integrally formed of a plate by a method described later. For this reason, the rigidity is high despite the light weight, and deformation during press-fitting and use can be reliably prevented.

Next, a method of manufacturing the sensor ring 1 will be described.

The manufacturing procedure will be briefly described with reference to FIG.
First, as shown in FIG. 3A, a plate material 18 is formed to produce a raw material 19 in which the cylindrical portion 6, the sensing portion 8 and the outer peripheral ring portion 9 are integrally formed. Next, as shown in FIG. 5B, piercing is performed, and half of every other rectangular hole 10a is processed. Next, as shown in FIG. 3 (c), the remaining rectangular hole 10b is pierced. Finally, the sensor ring 1 is completed by bending the flange portion 7 as shown in FIG.

FIG. 5 shows a method of manufacturing the raw material 19. (a) As shown in the figure, a circular blank 20 made of a medium thickness (about 1 to 4 mm) plate 18 is drawn as shown in the figure (b), and then the bottom 21 of this processed product is set to ( c) As shown in the figure, punching is performed by piercing and the flange portion 22 is folded back into a U-shaped cross section. Thereafter, as shown in FIG. 5D, a cylindrical portion 6 having a linear cross section is formed by burring and ironing, and finally, as shown in FIG. The portion 22 is corrected to have a U-shaped cross section. Thereby, the sensing part 8 and the outer peripheral ring part 9 are formed, and the material 19 is completed. As will become clear later, in the material 19, it is necessary to form the inner and outer diameters of the flange with high precision over the entire length in the axial direction. Further, in order to suppress the molding load at the time of molding the flange portion 7, the axial height of the fitting surface flange needs to be molded with high accuracy.

Next, the material 19 manufactured as described above is set in a first mold 23 shown in FIG. 6 and pierced in two stages.

As shown in FIG. 6, the first mold 23 has a lower mold 24 which is a fixed mold and an upper mold 25 which is an elevating mold.
The lower mold 24 has a die 26 fixed on the upper surface thereof, and a nest plate 27 is fixed on the upper surface of the die 26. A punch fixing portion 28 is formed on the lower surface of the upper die 25, and piercing punches 29 for piercing the rectangular holes 10 are fixed to the punch fixing portion 28 in a circumferential direction. Upper mold 2
A guide post 30 is fixed to the lower side of the guide post 5, and a presser die 31 is supported on the guide post 30 so as to be able to move up and down.

As shown in FIG. 7, the material 19 is placed on the die 26 with the sensing portion 8 facing down. At this time, the cylindrical portion 6 is fitted to the nest plate 27, whereby the material 19 is centered.

The piercing punch 29 has a rectangular hole 1 to be machined.
0 is provided, and the circumferential interval thereof is rectangular hole 10.
In the circumferential direction P (see FIG. 3). Thus, the piercing punch 29 forms every other rectangular hole 10 by one processing. The piercing punch 29 has a rectangular cross-section having the same shape as the rectangular hole 10, and the same number of punch holes 32 having the same cross-sectional shape are provided in the die 26 in order to insert the piercing punch 29 after punching (see FIG. 8). The punch hole 32 is communicated with a drop hole 33 of the lower die 24, and a scrap is dropped and discharged through the holes 32, 33.

A stopper bolt 65 is provided to define a normal relative position of the presser die 31 with respect to the upper die 25. The stopper bolt 65 is fixed to the upper die 25 by the screw portion 34. A coil spring 35 as an urging member is fitted on the outer peripheral side of the stopper bolt 65. Presser die 31
Are the head 36 of the stopper bolt 65 and the coil spring 3
5 and is normally held at the same relative position with respect to the upper mold 25, and interlocks with the upper mold 25. However, if the upper die 25 descends and the presser die 31 hits downward, the coil spring 3
5 is a relief, and even if the upper die 25 is lowered, the presser die 31
Stops descending. At this time, the compression force generated by the spring causes the sensing unit 8 to come into close contact with the die 26. Further, after the end of the punching, the separation of the piercing punch 29 and the sensing unit 8 after the punching is facilitated as a stripper force.

As shown in detail in FIG. 7 and FIG.
A pressing portion 37 that protrudes downward is integrally formed on the inner peripheral portion of the device 1. When the presser die 31 descends,
The sensing portion 8 is fitted into a space 38 surrounded by the cylindrical portion 6, the sensing portion 8 and the outer peripheral ring portion 9 from above.
Is to be held down. That is, the inner peripheral surface 39 and the outer peripheral surface 40 of the holding portion 37, and the outer peripheral surface 13 of the cylindrical portion and the inner peripheral surface 15 of the outer peripheral ring portion 9 are formed with high precision so that they can slide on each other. A notch 42 is formed on the outer peripheral surface of the lower part of the presser 37 to avoid interference with the outer peripheral ring 9.
Is provided.

On the other hand, as shown in detail in FIG.
Has a built-in nest pin 43 which can appear on the upper surface. The nest pin 43 is housed in a pin hole 44 provided in the die 26, can be moved up and down while being guided by the nest pin 43, and is urged upward by a built-in spring 45 (see FIG. 6). It is designed to protrude.

The upper end of the nest pin 43 is formed in a roof-like pointed shape. Further, the pin hole 44 is located at the same radial position as the punch hole 32 and at a circumferentially intermediate position of the punch hole 32, that is, at a circumferential position separated by one pitch (P) from each of the adjacent punch holes 32. You. Pin hole 44
Are long holes radially inward and outward of the punch hole 32, and their radially inner and outer ends are rounded. The nest pins 43, the pin holes 44, and the springs 45 are arranged at equal intervals at several locations along the entire circumference. The width of the nest pin 43 in the circumferential direction is made slightly smaller than the piercing punch 29.

As shown in FIG. 9, the holding portion 3 of the holding die 31
7 is provided with rectangular grooves 46 and 47 for inserting the piercing punch 29 and the nest pin 43 along the longitudinal direction. One rectangular groove 46 is for the piercing punch 29, and the other rectangular groove 47 is for the nest pin 43. In particular, as shown in FIG. 7, the piercing punch rectangular groove 46 can slide and guide the piercing punch 29 on three sides thereof. The radial outer side surface 48 of the rectangular groove 46 is located at substantially the same position as the inner peripheral surface 15 of the outer peripheral ring portion 9, whereby the piercing punch 29 slides accurately in cooperation with the outer peripheral surface 13 of the cylindrical portion. I can guide you. By employing such a configuration, the periphery of the rectangular hole 10 can be reliably suppressed by the pressing portion 37, and the width Wr of the rectangular hole 10 can be made substantially equal to the interval between the outer peripheral surface 13 and the inner peripheral surface 15.

The piercing process (first step) using the first mold 23 is performed in the following procedure. As shown in FIG. 6, first, the material 19 is set on the die 26 with the sensing unit 8 turned down as described above. At this time, the nest pin 43 is pushed down by the sensing unit 8 and is completely accommodated in the pin hole 44. Next, the upper die 25 is lowered, and the presser die 31 is lowered in conjunction with this. Then, the holding part 3 of the holding die 31
7 is fitted in a space 38 surrounded by the cylindrical portion 6, the sensing portion 8, and the outer ring portion 9, and simultaneously presses the sensing portion 8 from above. Thereby, the material 19 is held from three directions. At this point, the presser die 31 stops, and the overstroke of the upper die 25 is absorbed by the coil spring 35. However, after the stop, the lowering of the upper die 25 continues, and the piercing punch 29 eventually becomes half of the total number. The rectangular holes 10 are simultaneously drilled. Thus, the first processed product shown in FIG. 4 (b), that is, a half pierced product 49 is completed.

Thereafter, when the upper die 25 is raised, first, the presser die 31 is stopped by the stripper force applied from the coil spring 35 and presses the sensing portion 8 downward, while the piercing punch 29 is raised and processed. It is pulled out from the already-formed rectangular hole 10. Next, the holding portion 37 is removed from the space 38, and the half pierced product 49 is pushed up by the nest pin 43, and the half pierced product 49 is separated from the upper surface of the die 26 while being fitted to the nest plate 27, in a so-called floating state. Become. Therefore, if the half pierced product 49 is shifted in the circumferential direction by one pitch in this state, the nest pin 43 in the protruding state enters the processed rectangular hole 10, and the half pierced product 49 falls and is reset on the die 26. You. In this way, the semi-pierced product 49 can be easily reset, and at the same time it can be positioned very accurately in the circumferential direction. And since the upper end of the nest pin 43 is pointed, the insertion is reliable and easy.

Below the piercing punch 29, there is still a rectangular hole 1
0 is not processed. If the upper die 25 is lowered in the same manner as described above, the piercing punch 29 is lowered and the remaining rectangular hole 1 is lowered.
Zero can be cleared. Thus, a processed product 50 with holes shown in FIG. 4C is completed. Thereafter, the upper mold 25 is raised, and the processed product 50 with holes is taken out. Thus, the piercing step is completed.

Next, the cylindrical part 6 is bent and the flange part 7 is formed on the processed product 50 with holes thus manufactured. Here, the method according to the prior application will be described first, and the method according to the present application will be described later. In the prior application, a second mold 51 as shown in FIG. 10 was used. The figure shows the center line C
The right side with respect to x indicates the state when the upper mold rises, and the left side indicates the state when the upper mold descends.

As shown in FIG. 10, the second mold 51 has a lower mold 52 that is a fixed mold and an upper mold 53 that is a liftable mold. The lower mold 52 includes a lower mold riser 54 fixed to the upper surface thereof.
And a fixed punch 55 is fixed to the upper surface of the lower die riser 54. On the lower surface of the upper mold 53, an upper mold punch 56 is fixed on the axial center side, and a ring-shaped elastic member 57 as a whole protrudes downward on the outer peripheral side. A nest pin 58 is provided on the lower mold 52 so as to be able to move up and down.
Further, on the lower mold 52, a movable mold 59 that can move in the radial direction is provided.

The upper surface of the lower die riser 54 is processed into a stepped shape, and a projection 60 is formed at the axis of the riser so as to bulge in a cylindrical shape. The fixing punch 55 is formed in a ring shape having the same outer diameter as the convex portion 60, and is coaxially mounted and fixed on the convex portion 60. The fixed punch 55 has an L-shaped cross section with a bottom protruding inward to stabilize its seating.
Has a radial width equivalent to that of the processed product 50 with holes. The nest pin 58 is slidable on the upper inner peripheral surface 61 of the fixed punch 55 and is normally held at a position protruding above the fixed punch 55 as shown on the right side of the center line Cx.

That is, the nest pin 58 is provided with a pin shaft 62 projecting downward. The pin shaft 62 is attached to the lower mold 52.
And, it is inserted into a center hole 63 formed in the lower die riser 54 and is urged upward by urging means (not shown), and the rise is regulated at a certain position by stopper means (not shown). Thus, the nest pin 58 can be normally stopped at the above-mentioned position while being urged upward.

The movable die 59 is formed in a cylindrical shape surrounding the fixed punch 55, is divided into a plurality of pieces in the circumferential direction (here, divided into two parts), and can move in the radial direction. This movement is performed from outside in the radial direction by a cylinder 64 as an actuator. The movable die 59 slides on the upper surface on the outer peripheral side of the convex portion 60 of the lower die riser 54. Therefore, the slider 6 is provided on the upper surface and the lower surface of the movable mold 59.
6 and 67 are respectively attached so that sliding can be performed smoothly. A pressing portion 68 is formed on the upper part of the movable die 59 so as to protrude radially inward.

When the workpiece 50 with holes is set in the second mold 51, the movable die 59 is moved radially outward in advance, and in this state, the workpiece 50 with holes is fixed with the sensing unit 8 down. It is placed on the punch 55. At this time, the cylindrical portion 6 is fitted to the nest pin 58, and thereby the processed
A centering of zero is made. Thereafter, the movable die 59 is moved inward in the radial direction as shown in the figure, and the pressing portion 68 holds the cylindrical portion 6 from the radial outside while avoiding the outer peripheral ring portion 9. At this time, a part of the middle of the cylindrical portion 6 is pinched by the pressing portion 68 and the nest pin 58 with an appropriate load. Thus, the holding of the processed product 50 with holes is completed. At this time, the upper end of the cylindrical portion 6 is
Projecting slightly upward from the position.

The elastic member 57 is made of an elastic material such as urethane rubber, and is fixed between the lower mold 52 and the ring plate 75 with bolts 76. In particular, since the bolt 76 does not enter the lower mold 52 more than the length of the screw portion 77,
The natural length of the elastic member 57 is normally secured as shown on the right side of the center line Cx.

The upper punch 56 has a columnar shape with an outer peripheral surface formed in a stepped shape, and has an upper portion having a large diameter portion 69 and a lower portion having a small diameter portion 70. The small-diameter portion 70 has a nest pin 58
Similarly, the outer diameter is made equal to the inner diameter of the cylindrical portion 6 of the processed product 50 with holes, and can slide on the inner peripheral surface 71 of the cylindrical portion. In particular, the lower surface 72 of the large-diameter portion 69 is a plane perpendicular to the axial direction, and is a horizontal plane parallel to the upper surface 80 of the holding portion 68. FIG.
2, the lower surface 72 of the large diameter portion 69 and the small diameter portion 70
A C surface 74 is formed at a connection portion with the outer peripheral surface 73. This is for forming the C surface 17 of the sensor ring 1 described above.

As shown in FIG. 12, in the movable die 59, a tapered inclined surface 81 is formed over the entire periphery of the connecting portion between the inner peripheral surface 79 of the holding portion 68 and the upper surface 80. . Here, the C surface 74 has a width C ₁ and a height C ₂ in the radial direction and the height direction (axial direction), respectively, and C ₁ = C _2. Each of the inclined surfaces 81 is inclined by 45 °, but the inclined surface 81 is closer to the direction of the C surface 74 in the axial direction. In particular, the inclined surface 81
Is approximately 1 / the radial width C ₁ of the C surface 74.
2 and the height Wdh of the inclined surface 81 is the height C of the C surface 74.
₂ or more. Outer peripheral surface 73 of small diameter portion 70 and holding portion 68
Is made equal to the thickness T of the cylindrical portion 6.

When the upper die 53 is lowered after the holding of the processed product 50 with holes, the small-diameter portion 70 of the upper die punch 56 is moved downward as shown on the left side of the center line Cx in FIG. Is inserted into the cylindrical portion 6. At this time, since the outer peripheral edge of the lower end of the small diameter portion 70 is chamfered, the insertion is easy and reliable without being caught on the cylindrical portion 6. After insertion, the outer peripheral surface 73 of the small diameter portion 70 slides on the inner peripheral surface 71 of the cylindrical portion.

Next, the small diameter portion 70 comes into contact with the nest pin 58 and pushes down the nest pin 58. At this time, even if the nest pin 58 comes off below the processed product 50 with a hole, the processed product 50 with a hole is
Misalignment is prevented.

Thereafter, the ring plate 75 is moved to the movable mold 59.
In this case, the elastic member 57 is slightly compressed in the axial direction, and the movable die 59 is pressed downward by the repulsive force at this time, thereby preventing the movable die 59 from shifting in the vertical and radial directions. Upper mold 5
3, the lower end of the bolt 76 projects from the ring plate 75.
Is inserted into the escape hole 78 provided at the bottom.

Next, the upper end of the cylindrical portion 6 is
6 is pressed by the C surface 74 and the lower surface 72 of the movable die 59 and is sandwiched between the inclined surface 81 and the upper surface 80 of the movable die 59, and is bent outward in the radial direction. That is, the movable mold 59 also serves as a die. This processing is continued until the bottom dead center where the nest pin 58 contacts the lower die riser 54, and when the bottom dead center is reached, the flange portion 7 having a desired shape is formed. Thus, the sensor ring 1 is completed. After that, the upper die 53 is lifted, and the movable die 59 is moved radially outward to remove the sensor ring 1.

The bending process will be described in detail. FIG.
FIG. 1A shows an example in which the protrusion length Hm of the cylindrical portion 6 is relatively long, and the inclined surface 81 has the same size and direction as the C surface 74. FIG. 11B shows the protrusion length Hm of the cylindrical portion 6.
Is relatively short, and the inclined surface 81 is an example in a case similar to FIG. Further, FIG. 11C shows the protrusion length Hm of the cylindrical portion 6.
Is relatively short, and the inclined surface 81 has the C surface 7 as described above.
This is an example in the case where the direction is approached in the axial direction with respect to the direction 4.

In the case of the example of FIG. 11A, as the upper punch 56 descends, first, the upper end face 82 and the inner peripheral face 7 of the cylindrical portion 6 are moved.
The corner portion 83 at the intersection of No. 1 abuts on the C surface 74. Then, the corner portion 83 slides on the C surface 74, and at the same time, the bent portion 84 above the lower end position of the inclined surface 81 is bent outward in the radial direction. In this process, the bent portion 84 is curled because its processing length is relatively long. This curling portion slides on the lower surface 72. In the final stage, the upper surface of the curling portion is crushed by the lower surface 72, and the above-described contact surface 16 is formed.
At this time, curling between the lower surface 72 and the upper surface 80 must be corrected. Due to such a process, a relatively high molding load is required for molding.

However, in the case of the example of FIG.
Since m is relatively short, the bent portion 84 can be bent and formed in a straight line along the C surface 74 without curling, and further, the corner portion 83 is crushed by the lower surface 72 at the final stage to make contact with the contact surface. 16 can be molded. For this reason, molding can be performed with a lower load than the previous example.

However, when the corner portion 83 is crushed, the bent portion 84 tends to become thick. In this case, in this case, there is not enough volume between the C surface 74 and the inclined surface 81, and a so-called closed forged state is formed. Depending on the degree of compression, the material moves downward, causing deformation of the sensing unit 8. Due to these, the molding load is still large,
Problems such as deterioration of the flatness of the sensing unit 8 and deformation of the movable mold 59 occur. In particular, the movable mold 59 cannot apply a high load due to its structure, and improvement is essential.

Accordingly, here, the configuration is as shown in FIG. In this way, a sufficient volume can be secured between the C surface 74 and the inclined surface 81, and the material can escape in this volume, thereby avoiding a so-called closed forging state. Thus, the above-described problem can be solved. The values of Wdr and Wdh of the inclined surface 81 are determined from such a viewpoint.

According to the manufacturing method of the prior application, the rectangular hole 10
By forming the piercing process in two stages, forming the inclined surface 81, and the like, the molding load during the production of the sensor ring can be suppressed low, and the production becomes easy. In addition, the manufacturing apparatus (first
The mold 23, the second mold 51, and the accompanying driving device) can be reduced in size and cost, and the manufacturing cost can be reduced.

Further, by employing the nest pin 43, the pitch error in the circumferential direction of the rectangular hole 10 can be extremely reduced, and the manufacturing error can be suppressed low. Also nest pin 43
Can be reliably pressed by the presser die 31, so that deformation of the material can be prevented. Here, at the position where the pin hole 44 of the die 26 is located, the pitch between the holes is halved, and the mold is likely to be damaged.
By devising the shape of the pin hole 44 as described above, the mold can be prevented from being damaged.

Incidentally, the manufacturing method of the prior application includes the following problems. That is, as shown in FIG.
If the inclined surface 81 is relatively large, the material escapes too much in the bending process radially outward to the gap 90 between the lower surface 72 and the upper surface 80, and the bent of the finished product is started near the lower end position of the inclined surface 81, The material floats from the punch outer peripheral surface 73 at a portion A above the lower end position. Thus, there is a problem that the accuracy of the fitting surface of the cylindrical portion 6, that is, the inner peripheral surface 71 below the P position is deteriorated. The cylindrical portion 6 includes a flange portion 7
There is also a case where only approximately half of the side is fitted. In this case, if the precision is not obtained in the vicinity of the flange portion 7, the fitting length becomes short,
The fitting to the other party becomes uncertain.

At the same time, the C
Since the C surface 17 of the ring 1 does not have a predetermined desired shape, a mechanical cutting is required in some cases. In this case, the advantage of the present manufacturing method that can be integrally formed only by press working is lost. On the other hand, when the inclined surface 81 is eliminated, the above-described closed forging state occurs, which causes an increase in molding load, insufficient mold strength, and the like.
As described above, in the method of processing the flange portion of the prior application, the inner peripheral shape of the flange portion 7 may be a so-called sagged shape, which is a problem.

Therefore, according to the working method of the present invention, as shown in FIGS.
The flange 91 is processed while being restrained from the radial outside by the projection 91. In this way, the material that tends to spread outward in the radial direction during the bending process does not hit the projecting portion 91 and does not escape too much radially outward. Instead, the material is pressed against the outer peripheral surface 73 and the C surface 74, and the desired shape is stabilized. To be obtained.

In addition, in the present application, as shown in FIG. 15, the size of the inclined surface 92 is set to the minimum size in a range that does not cause a closed forged state. Specifically, the angle θ of the inclined surface 92 with respect to the axial direction of the present application was made equal to the angle θ ₀ of the inclined surface 81 of the earlier application, and Wdr and Wdh were smaller than those of the earlier application. As a result, the bending start position can be raised to the flange portion 7 side, and the linear portion of the inner peripheral surface 71 of the cylindrical portion can be secured as stably as possible as compared with the case where only the projection portion 91 is provided.

In the flange portion 7 thus processed, the contact surface 16 is reliably formed, and only small gaps 92, 93, 94 between the lower surface 72, the upper surface 80, and the projection 91 can be formed.

The projecting portion 91 is provided integrally with the upper die punch 156, is formed in a ring shape along the entire periphery of the lower surface 72, and
The inner peripheral side surface has a linear cross section along the axial direction. However, various modifications of the projections are conceivable, and for example, they can be made separately.

In the present application, the second mold is configured as shown in FIG. In the drawing, the right side with respect to the center line Cx indicates the upper mold top dead center, and the left side indicates the upper mold bottom dead center.

As shown, the second mold 151 has a lower mold 152 as a fixed mold and an upper mold 153 as an elevating mold. The lower mold 152 has a fixed plate 154, and a fixed punch 155 is fixed to the upper surface axial side of the fixed plate 154. On the lower surface of the upper mold 153, as shown in FIG.
An upper die punch 156 is fixed to the shaft center side by projecting downward through a square plate 176.
A flat backup member 157 protrudes downward and is fixed to the outer peripheral side of. Nest pin 58, which had been filed earlier, has been abolished. A movable mold 15 that can move in the radial direction is provided on the lower mold 152.
9 are provided. The movable mold 159 slides on a slider 156a provided on the fixed plate 154.

The fixed punch 155 is formed in a cylindrical shape having a bottom and an open top, and a processed product 5 having a hole is provided on the cylindrical portion 158.
0 is placed. The radial thickness of the cylindrical portion 158 is equal to the radial dimension of the workpiece 50 with holes.

The structure and operation of the movable mold 159 are almost the same as those of the prior application. That is, as shown in FIG.
Is formed into a cylindrical shape surrounding the fixed punch 155, and is divided into a plurality in the circumferential direction (in this case, divided into two), each of which can move in the radial direction. The movement is a plurality of cylinders 164 that are actuators (here, air cylinders).
Is performed from the outside in the radial direction. A pressing portion 168 is formed at an upper portion of the movable mold 159 so as to protrude radially inward.

A backup block 180 as a fixing member is provided at a plurality of circumferential positions outside the movable die 159 in the radial direction and not interfering with the cylinder 164. The backup block 180 is fixed on the fixing plate 154. As shown in FIG.
The guide post 181 is integrally projected from the guide die 181, and the guide post 181 is inserted into a guide bush 182 embedded in the movable die 159. As a result, the movable mold 159 can be accurately guided and moved.

In particular, as shown on the left side of FIG. 16, the lower portion of the backup member 157 is an insertion portion 183 that can be slidably inserted between the backup block 180 and the movable die 159 when the upper die is lowered. Notch 184 in insertion portion 183
Is provided so that the rod 185 of the cylinder 164 can be avoided.

The configuration of the upper die punch 156 is the same as in the prior application, and differs only in that a projection 91 is provided. Except for the inclined surface 92, the flange forming portion of the movable die 159 is the same as in the prior application. Therefore, the same reference numerals are given to the same portions in the drawings, and description thereof will be omitted. Since the elastic member 57 of the prior application has been eliminated, no corresponding relief hole 78 is provided.

The method of processing the flange portion of the second mold 151 is as follows. First, as shown on the right side of FIG. 16, the movable die 159 is moved to the outside in the radial direction, and the work piece 50 with the hole is fixed to the fixed punch 1 with the sensing portion 8 down.
Place on 55. At this time, since there is no nest pin 58, care must be taken to prevent slippage. In the prior application method, the centering was performed by fitting to the nest pin 58, but this process was relatively troublesome. According to the method of the present invention, the setting is easy because it requires only a little care, but is merely placed. In addition, since it is held by the movable mold 159 immediately after this, the time during which there is a possibility of slippage is very short, and there is no particular problem.

After setting the workpiece 50 with holes in this way, the movable mold 159 is moved inward in the radial direction, and the workpiece 50 with holes is moved.
From the outer peripheral side. At this time, the holding portion 168 becomes a substantial holding portion. Until the flange forming of the workpiece 50 with holes is completed, pressure is applied to the cylinder 164 to prevent the movable mold 159 from opening during the forming.

Next, when the upper die 153 is lowered, the upper die punch 156 and the backup member 157 are lowered in conjunction with each other. As shown in the left side of FIG. 16 and FIG. 19, first, the insertion portion 183 of the backup member 157 is slid and inserted between the backup block 180 and the movable mold 159. As a result, the movable mold 159 is completely restrained, and cannot be moved outward in the radial direction at all even if it receives a reaction force during flange forming.

Next, the small-diameter portion 70 of the upper die punch 156 is slidably inserted into the cylindrical portion 6 of the workpiece 50 with holes, and the C surface 74 and the lower surface 72 of the upper die punch 156 press the upper end of the cylindrical portion 6. Then, the movable mold 159 is bent outward in the radial direction while being sandwiched between the inclined surface 92 and the upper surface 80 of the movable mold 159. Thus, the sensor ring 1 is completed. Thereafter, the upper die 153 is raised, and the movable die 159 is moved radially outward to remove the sensor ring 1.

As described above, in this processing method, the backup member 157 and the backup block 180
Another major feature is that the movable die 159 is prevented from opening (moving outward in the radial direction) during processing of the flange portion. Since the insertion portion 183 of the backup member 157 needs to be slid and inserted accurately, the dimensional accuracy is strictly controlled, so that the outer peripheral surface of the movable die 159 and the inner peripheral surface of the backup block 180 can be slidably contacted accurately. Has become. The sliding surfaces are all parallel to the axial direction.

In the prior application, the movable die 159 was restrained by utilizing the elastic force of the elastic member 57 in addition to the cylinder force.
In this case, only the pressing is performed from above, and thus the binding force is lacking.
In the present application, since the backup member 157 is driven in a wedge shape, complete restraint can be performed and mold movement can be completely prevented.

The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and can adopt various embodiments. For example, the present invention can also be applied to a case where a flange portion 7 that is bent radially inward as shown in FIG. 20 is processed. In this case, the movable type, the backup member, the fixed member, and the like are located on the inner peripheral side of the sensor ring.

[0082]

The present invention exhibits the following excellent effects.

(1) The fitting surface accuracy near the flange of the sensor ring can be kept good.

(2) In processing the C surface of the sensor ring,
No machining is required.

(3) The movement of the movable mold at the time of processing the flange portion can be completely prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a mounting state of a sensor ring.

FIG. 2 is a perspective view showing a sensor ring.

FIG. 3 shows a sensor ring, wherein the upper part is a plan view, and the lower part is a longitudinal sectional front view.

4A and 4B show a manufacturing process of the sensor ring, FIG. 4A is a perspective view showing a material, FIG. 4B is a perspective view showing a half-pierced product,
(c) is a perspective view showing a processed product with holes, and (d) is a perspective view showing a sensor ring.

FIGS. 5A to 5E are longitudinal cross-sectional views for explaining a method of forming a material.

FIG. 6 is a vertical cross-sectional view showing a first mold, showing cross sections of different planes including a center line.

FIG. 7 is an enlarged longitudinal sectional view showing the periphery of a material set in a first mold.

FIG. 8 is a perspective view showing a die and a nest pin of a first mold.

FIG. 9 is a perspective view showing a holding die.

FIG. 10 is a longitudinal sectional view showing a second mold of the prior application.

11 (a) to 11 (c) are enlarged longitudinal sectional views each showing a state of processing a flange portion.

FIG. 12 is an enlarged vertical cross-sectional view around the C-plane and the inclined surface of the second mold of the prior application.

FIG. 13 is an enlarged vertical sectional view showing a sag shape near a flange portion.

FIG. 14 is an enlarged vertical sectional view showing a state of processing of a flange portion according to the present application.

FIG. 15 is an enlarged vertical sectional view of the periphery of a C-plane and an inclined surface of a second mold of the present application.

FIG. 16 is a longitudinal sectional view showing a second mold of the present application.

FIG. 17 is an enlarged vertical sectional view showing a movable type and a backup block.

FIG. 18 is a plan view schematically showing the configuration of the upper mold side.

FIG. 19 is a plan view schematically showing a state when a backup member is inserted.

FIG. 20 is a perspective view showing an application example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sensor ring 6 Cylindrical part 7 Flange part 72 Lower surface 73 Outer peripheral surface 74 C surface 91 Projection 156 Upper die punch 157 Backup member 159 Moving die 180 Backup block

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[Procedure amendment]

[Submission date] February 26, 1999 (1999.2.2
6)

[Procedure amendment 1]

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Claims (4)

[Claims] 1. A method for processing a flange portion of a sensor ring, comprising pressing an axial end of a cylindrical portion with a lower surface of an upper punch and bending the flange in a radial direction to form a flange portion. A method for processing a flange portion of a sensor ring, wherein a projection is provided on a lower surface, and the flange is processed in a radial direction by the projection. 2. The method according to claim 1, wherein the cylindrical portion is radially held by a movable die and a backup member is slidably inserted between the movable die and the fixed member before the flange portion is processed. How to process the flange of the sensor ring. 3. A method for processing a flange portion of a sensor ring, comprising pressing one axial end of a cylindrical portion on the C surface and the lower surface of an upper die punch and bending the flange portion radially outward to form a flange portion. A protrusion is provided on the lower surface of the upper die punch, and the flange is restrained from the outside in the radial direction by the protrusion, and processing is performed while pressing against the outer peripheral surface and the C surface of the upper die punch. Processing method of the flange part of the sensor ring. 4. Prior to machining the flange portion, the cylindrical portion is held from the outside in the radial direction by a movable die, and the upper die punch is interposed between the movable die and a fixing member located radially outward from the cylindrical portion. 2. The method according to claim 1, wherein the backup member is slidably inserted in conjunction with the downward movement of the flange.