JP3149978B2 - Notch forming method for ball joint socket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a notch in a ball joint socket used for forming a notch in a ball joint socket of a damper stay provided in, for example, a back door of an automobile.

[0002]

2. Description of the Related Art A ball joint comprises a ball pin provided with a pin on a ball, and a socket provided with a ball receiving portion which forms a spherical pair by fitting the ball of the ball pin. It is used at both ends of a damper stay which is a balancer of a back door of an automobile. In this ball joint, the threaded part of the ball pin pin is screwed into both the vehicle body and the back door and fixed, and the ball pin ball is stopped in the ball receiving part of the socket fixed to each end of the damper stay. Is used to mount the damper stay through two spherical pairs between the vehicle body and the back door.

[0003] This ball joint does not assume that the ball of the ball pin fitted into the ball receiving portion of the socket is extracted from the ball receiving portion. In the case of, the ball pin side must be removed from the vehicle body and the back door. Therefore, recently, a notch is formed in the peripheral edge of the opening of the ball receiving portion provided in the socket, and a torsion spring is fitted to the pin side portion of the ball of the ball pin, and both ends of the torsion spring are engaged with the notch. A ball joint having a configuration in which a torsion spring is fitted to a ball receiving portion of a socket together with a ball is employed. In this ball joint, by twisting both ends of the torsion spring, the ball of the ball pin is easily removed from the ball receiving portion of the socket, so that the ball pin does not have to be removed from the vehicle body and the back door. I have.

Conventionally, in such a ball joint, when forming a notch in the peripheral edge of the opening of the ball receiving portion provided in the socket, a part of the peripheral edge of the opening is cut and removed little by little using an end mill or a full-form milling cutter. The method of forming the notch was adopted.

[0005]

However, in the prior art, a notch was formed from the outer edge side of the socket by a cutting process using an end mill or a form milling machine. Not only the cutting step but also a step of removing the burrs is required.Therefore, there is a problem that it takes a long time to form a notch having a good shape and productivity is poor. It was an issue.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and is necessary for forming a notch in an opening peripheral portion of a ball receiving portion provided in a socket which constitutes a ball joint together with a ball. An object of the present invention is to provide a method for forming a notch in a socket for a ball joint, which can shorten the processing time and thereby improve the productivity.

[0007]

According to the present invention, there is provided a method for forming a notch in a socket for a ball joint, wherein the ball joint comprises a ball and a socket provided with a ball receiving portion forming a spherical pair by fitting the ball. In forming a notch in the peripheral edge of the opening of the ball receiving portion provided in the socket,
Using a blade provided with a curved cutting edge having a curvature substantially the same as the curvature of the inner edge of the opening peripheral portion of the ball receiving portion provided on the socket, from the inner edge side of the opening peripheral portion to the outer edge side of the opening peripheral portion. The notch is formed by moving the curved cutting edge of the cutting tool at high speed to shear away a part of the opening peripheral portion, thereby forming the notch in such a ball joint socket. Is a means for solving the above-mentioned conventional problem.

[0008]

In the method for forming a notch in a socket for a ball joint according to the present invention, the cutting edge of the cutting tool is moved at a high speed from the inner edge of the peripheral edge of the opening of the ball receiving portion provided in the socket toward the outer edge. When a part of the periphery of the opening is removed by shearing, a notch is formed instantaneously. At this time, if the cutting edge of the cutting tool is straight, both corners of the cutting edge enter the opening peripheral portion, so that not only a notch of good shape cannot be formed due to plastic deformation at the opening peripheral portion, but also the possibility of blade spilling. However, in the ball joint socket notch forming method according to the present invention, since the cutting edge is curved, the curved cutting edge of the cutting tool almost uniformly contacts the inner edge of the opening peripheral portion to perform shearing. Therefore, a well-shaped notch is formed at the periphery of the opening without plastic deformation, and no burrs are formed at the end of the notch. Therefore, since it is not necessary to perform a deburring operation after the formation of the notch, the processing time is shortened, and the productivity is improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIGS. 1 to 4 show an embodiment of a method for forming a notch in a socket for a ball joint according to the present invention.

The ball joint 1 shown in FIGS. 3 and 4 comprises a ball pin 2 and a socket 3. The ball pin 2 constituting one side of the ball joint 1 has a ball 2b at the tip of the pin 2a. It is provided.

Further, the socket 3 constituting the other side of the ball joint 1 has a ball receiving portion 3a which is fitted with the ball 2b of the ball pin 2 and forms a spherical pair, and is partially provided on the ball receiving portion 3a side. It has a caulking cylindrical portion 3b to be connected, and has a notch 3d at a portion (a front end side) opposite to the caulking cylindrical portion 3b at the opening peripheral edge 3c of the ball receiving portion 3a.

In the ball joint 1, a torsion spring 4 is fitted to the ball 2b of the ball pin 2 on the pin 2a side.
Both ends of the torsion spring 4 are engaged with the notches 3d, and together with the ball 2b of the ball pin 2,
Is fitted to the ball receiving portion 3a of the socket 3 to prevent the ball 2b of the ball pin 2 from falling out of the ball receiving portion 3a of the socket 3.

A notch 3 is formed in an opening peripheral portion 3c of a ball receiving portion 3a provided in a socket 3 constituting the other side of the ball joint 1.
When forming d, as shown in FIG. 1 and FIG. 2, a cutting tool 1 having an elongated shape and having a curved cutting edge 10 a is used.
Perform using 0. In this case, the curved cutting edge 10 of the cutting tool 10 is used.
“a” has a shape substantially along the inner edge of the opening peripheral portion 3 c of the ball receiving portion 3 a provided in the socket 3. That is, the curvature of the curved cutting edge 10a is made substantially the same as the curvature of the inner edge of the opening peripheral edge 3c.

Notch processing device 20 equipped with cutting tool 10
Is a lifting / lowering body 23 provided with a blade holder 21 and a socket 3
Is provided.

The blade holder 21 provided on the elevating body 23 is composed of two blocks 22 and 22 each having a substantially half cylindrical shape, and a base end portion of the blade 10 is provided between the respective half surfaces of the blocks 22 and 22. Between the blocks 22, 22 with bolts 2
The blade 10 is held by being connected by 2a and 22a. A substantially columnar blade holder 21 holding the blade 10 is provided with a holder hole 23 formed in the elevating body 23.
a.

On the other hand, the jig 25 is fixed to the upright wall 26 and elevating body support portions 26a, 26a provided opposite to the upright wall 26 and provided at both ends of the upright wall 26, and has a ball receiving portion of the socket 3 at an intermediate portion. A socket holding wall 27 provided with a socket holding hole 27a for fitting the 3a side is provided. Pin holes 26b, 26b for fitting sliding pins 24, 24, the upper ends of which are fixed to the elevating body 23, are formed in the elevating body support portions 26a, 26a of the erecting body 23, respectively. Coil springs 24a for applying a moving force in the direction
24a is provided. Two guide blocks 28, 2 are provided between the elevating body support portions 26a, 26a of the upright wall 26.
9 is provided, and a space between these guide blocks 28 and 29 is defined as a blade moving space S.

In this case, when the ball receiving portion 3a side of the socket 3 is fitted into the socket holding hole 27a of the socket holding wall 27, the opening peripheral portion 3a of the ball receiving portion 3a.
c is protruded into the blade moving space S, and when the blade 10 descends together with the elevating body 23, the curved cutting edge 10a of the blade 10 is moved to the opening peripheral portion 3c.
Are moved from the inner edge to the outer edge.

Then, the notch processing device 20 with the cutting tool 10 mounted thereon is used for the ball receiving portion 3 provided on the socket 3.
When the notch 3d is formed in the opening peripheral part 3c of FIG. 1a, first, the notch device 20 is placed on a lower die of a pressing device (not shown), and then the socket holding member provided on the socket holding wall 27 of the jig 25 is held. The ball receiving portion 3 of the socket 3 is inserted into the hole 27a.
The a side is fitted.

Next, when the upper die of the press device is lowered to move the cutting tool 10 downward together with the elevating body 23, the curved cutting edge 10 a of the cutting tool 10 projects into the tool moving space S of the jig 25. The ball receiving portion 3 contacts the inner edge side of the opening peripheral portion 3c of the ball receiving portion 3a, and moves at a high speed to the position shown by the phantom line in FIGS.

During this time, a part of the opening peripheral portion 3c of the ball receiving portion 3a provided in the socket 3 is instantaneously sheared off from the inner edge side by the cutting tool 10, and the ball receiving portion 3c is removed.
A notch 3d is formed in the opening peripheral portion 3c of FIG.

At this time, since the curvature of the curved cutting edge 10a of the cutting tool 10 is substantially the same as the curvature of the inner edge of the opening peripheral edge 3c, the curved cutting edge 10a of the cutting tool 10 is located at the inner edge of the opening peripheral edge 3c. Since the shearing is performed almost uniformly, the burrs do not occur at the ends of the notches 3d.

FIGS. 5 and 6 show another embodiment of the method for forming a notch in a socket for a ball joint according to the present invention.

In this embodiment, a notch 3 is formed in a ball receiving portion 3a provided in a socket 3 constituting the other side of the ball joint 1.
The cutting tool 30 used to form d has a substantially disc shape, and is provided with two curved cutting edges 3 at an interval of 180 °.
0a and 30a. And this curved cutting edge 3
0a also has substantially the same curvature as the curvature of the inner edge of the opening peripheral portion 3c of the ball receiving portion 3a.

Notch processing device 40 equipped with this blade 30
Is provided with a base 41 installed on a lower die 51 of a press device, and a jig 44, and a horizontal rotating shaft 42 provided on the base 41.
Is fixed to the blade 30.

A horizontal rotating shaft 42 of the base 41 has a cam 4 driven by a downward projection 53 provided on an upper die 52 of a press device.
3 is fixed, and the cam 43 is formed by the lowering operation of the upper mold 52.
5, the horizontal rotating shaft 42, that is, the blade 30 fixed to the horizontal rotating shaft 42 is rotated counterclockwise in FIG.

The jig 44 has a socket holding portion 44a which holds the socket 3 with the opening peripheral portion 3c of the ball receiving portion 3a facing upward, and the socket 3 is mounted on the socket holding portion 44a. In the set state, the distal end side of the peripheral edge portion 3c of the opening of the ball receiving portion 3a is located on the rotation trajectory of the curved blade edge 30a, and when the blade 30 rotates, the curved shape of the blade 30 Blade edge 30a
Move from the inner edge side to the outer edge side of the opening peripheral portion 3c.

Reference numeral 45 in FIG. 5 is a socket holding rod, and reference numeral 46 is a rod driving means for operating the socket holding rod 45 in the left-right direction in FIG. Also. Code 4
Reference numeral 7 denotes a blade return mechanism, which transmits the elastic force of the coil spring 48 to the cam 43 via the push rod 49 so that when the upper die 52 is raised, the blade 30 and the cam 43 are moved together.
Is rotated clockwise in FIG.

Then, the notch processing device 40 to which the cutting tool 30 is mounted is used for the ball receiving portion 3a provided on the socket 3.
When forming the notch 3d in the opening peripheral portion 3c, first,
After the socket holding rod 45 is moved in the direction of the jig 44 by the rod driving means 46 and the socket 3 is set on the socket holding portion 44a of the jig 44, the upper die 52 of the pressing device is lowered. The blade 30 is rotated counterclockwise in FIG. 5 together with the cam 43 following the downward movement of the downward projection 53, and the curved cutting edge 30a of the cutting blade 30 is positioned on the rotation locus of the curved cutting edge 30a. 3
The ball receiving portion 3a contacts the inner edge of the opening peripheral portion 3c and moves at a high speed to the position shown by the phantom line in FIG. 5, that is, toward the outer edge of the opening peripheral portion 3c.

During this time, a part of the opening edge 3c of the ball receiving portion 3a provided in the socket 3 is momentarily sheared off from the inner edge side by the cutting tool 30, and a notch 3d is formed in the opening edge 3c of the ball receiving portion 3a. It is formed.

At this time, the curvature of the curved cutting edge 30a of the blade 30 is substantially the same as the curvature of the inner edge of the opening peripheral portion 3c of the ball receiving portion 3a in the same manner as in the previous embodiment. Since the curved blade edge 30a substantially uniformly contacts the inner edge of the opening peripheral edge portion 3c and performs shearing, no burrs are generated at the inner edge side end of the notch 3d.

In this embodiment, since the blade 30 is provided with the two curved cutting edges 30a, if one of the curved cutting edges 30a is spilled or worn, the other curved cutting edge 30a is used. By using 30a, it is possible to respond immediately.

[0033]

As described above, according to the present invention, in a ball joint formed by a ball and a socket provided with a ball receiving portion forming a spherical pair by fitting the ball, a ball provided on the socket is provided. When forming a notch in the peripheral edge of the opening of the receiving portion, use a cutting tool having a curved cutting edge having a curvature substantially the same as the curvature of the inner edge of the peripheral edge of the opening of the ball receiving portion provided in the socket. The notch is formed by moving the curved cutting edge of the blade at a high speed from the inner edge side to the outer edge side of the opening peripheral edge to remove the part of the opening peripheral edge by shearing. The time required for shearing off a part of the peripheral edge of the opening of the ball receiving part provided in the socket that constitutes the ball joint is short, and deburring work is not required. It can be realized greatly shortening of machining time required to form, resulting in a very excellent effect that it is possible to significantly improve the productivity.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a notch processing apparatus according to an embodiment of a method for forming a notch in a ball joint socket according to the present invention.

FIG. 2 is a sectional view of the notch processing device shown in FIG.

FIG. 3 is a plan view of a ball joint provided with a socket in which a notch is formed in an opening peripheral portion of a ball receiving portion.

4 is a cross-sectional view of the ball joint shown in FIG. 3 as viewed from a side.

FIG. 5 is a side view of a notch machining apparatus according to another embodiment of the method for forming a notch in a socket for a ball joint according to the present invention.

6 is a partially cutaway front view of the notch processing device of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ball joint 2b Ball 3 Socket 3a Ball receiving part 3c Opening peripheral part 3d Notch 10 30 Cutting tool 10a 30a Curved cutting edge

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16C 11/00-11/08

Claims (1)

(57) [Claims] 1. A ball joint comprising a ball and a socket provided with a ball receiving portion forming a spherical pair by fitting said ball, a notch is formed in an opening peripheral portion of the ball receiving portion provided in said socket. In doing so, a cutting tool having a curved cutting edge having substantially the same curvature as the curvature of the inner edge of the opening peripheral portion of the ball receiving portion provided on the socket is used, and the outer peripheral portion of the opening peripheral portion is provided from the inner peripheral side of the opening peripheral portion. A notch forming method for a socket for a ball joint, wherein the notch is formed by moving a curved cutting edge of the cutting tool toward the edge side at high speed and shearing off a part of the opening peripheral portion.