JP2002219533A - Caulking processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a caulking processing method capable of securing bonding strength by an axial body against a tubular body and of preventing an oscillation of the axial body against the tubular body in the caulking processing of the axial body and the tubular body. SOLUTION: In the caulking processing method by which a plunger (tubular body) 10 and a shaft (axial body) 20 in the electromagnetic valve A are integrally connected, by performing the caulking processing from the outer periphery of the plunger 10 to the shaft 20, in the condition that the base section 22 of the shaft 20 having a valve section 26 at the tip end is inserted into the inserting hole 14 of the plunger 10, insertions between the shaft 20 and the plunger 10 are loose fit including a clearance gap zero, and at the same time, by performing the caulking processing to the plunger 10, the outer peripheral surface of the shaft 20 and the internal peripheral surface of the inserting hole 14 in the plunger 10 are designed to mutually line-contact at least in the axial direction in the region other than the caulking processing section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a caulking method for integrally connecting a shaft and a cylindrical body.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Application Laid-Open No.
A method of manufacturing a solenoid valve disclosed in Japanese Patent Publication No. 80 is known. In this conventional manufacturing method, a shaft (sometimes called a rod), which is a constituent member of a solenoid valve, and a plunger are integrally connected by swaging. Specifically, an annular groove is formed on the outer periphery of the shaft, and plating is applied to the shaft to deposit a thicker plating layer on the corners of the groove than other portions. On the other hand, the plunger is provided with an insertion hole through which the shaft is inserted. When a plated shaft is inserted into the insertion hole, a tight allowance is generated between the outer peripheral portion of the thick plating layer at the corner of the concave groove and the inner peripheral surface of the insertion hole, and the shaft is pressed into the plunger. By this press-fitting, the shaft is temporarily fixed at a predetermined position with respect to the plunger, and the pressing portion (the portion corresponding to the concave groove) provided on the outer periphery of the plunger is pressed and caulked, whereby the plunger is deformed and the shaft is firmly fixed. Can be fixed.

[0003]

In the above-mentioned conventional method, the shaft is temporarily fixed at a predetermined position of the plunger by press-fitting, and then caulking is performed. By the way, when the shaft is pressed into the plunger, the outer peripheral surface of the thick plating layer and the inner peripheral surface of the insertion hole are in contact with almost the entire circumference. When the plunger in this state is pressed and crimped from the outer periphery at two opposing points, the insertion hole of the plunger is deformed into an elliptical shape having a short diameter in the pressing direction. Since the outer peripheral surface and the inner peripheral surface are in contact with each other only around the pressing portion, the shaft is supported by the plunger at two points.

[0004] For this reason, although the strength of the shaft in the axial direction to prevent the shaft from coming off is increased by caulking, the contact portion between the outer peripheral surface and the inner peripheral surface becomes substantially two points, and the shaft is pressed around this point. It becomes easy to swing in the orthogonal direction. Such rocking of the shaft can be prevented by crimping the pressing portion from two points to, for example, four points in a direction orthogonal to the pressing, but in this case, the productivity decreases with an increase in the number of crimping portions. .

[0005]

SUMMARY OF THE INVENTION The present invention has been made to address the above-described problems, and has as its object to secure the strength (coupling force) of a shaft (or a shaft to a plunger) against a cylindrical body. It is an object of the present invention to provide a swaging method for preventing a shaft body from swinging with respect to a cylindrical body.

A feature of the present invention (a feature of the invention according to claim 1) is that caulking is performed from the outer periphery of the cylindrical body toward the shaft body in a state where the shaft body is inserted through the insertion hole of the cylindrical body. Thus, in the caulking method for integrally connecting the shaft body and the cylindrical body, the insertion of the shaft body and the cylindrical body is performed with a gap fitting including zero clearance, and the cylindrical body is subjected to caulking. By doing so, the outer peripheral surface of the shaft body and the inner peripheral surface of the insertion hole in the cylindrical body come into line contact at least in the axial direction at a portion other than the caulking portion.

According to this, the shaft body and the cylindrical body are formed by a caulking portion of the cylindrical body and at least an axial line between the outer peripheral surface of the shaft body and the inner peripheral surface of the insertion hole of the cylindrical body. They are integrally connected by contact. This ensures the strength of the shaft body against the cylindrical body and prevents the shaft body from swinging relative to the cylindrical body by at least making a line contact between the shaft body and the cylindrical body in the axial direction. Can be. In addition, the insertion of the shaft body and the cylindrical body is a gap fitting including zero gap. By setting the shaft and the cylindrical body in the jig without depending on the press-fitting step, the jig can be held at a predetermined position, so that the caulking can be performed as it is. For this reason, it is not necessary to introduce a separate press-fitting facility.

[0008] A feature of the present invention (a feature of the invention according to claim 2) is that the base of the shaft having the valve portion at the tip is inserted from the outer periphery of the plunger toward the shaft in a state of being inserted into the insertion hole of the plunger. In the caulking method for integrally connecting the shaft and the plunger in the solenoid valve by performing caulking, the shaft and the plunger are inserted into the gap including zero gap, and the plunger is caulked. With this configuration, the outer peripheral surface of the shaft and the inner peripheral surface of the insertion hole of the plunger make line contact at least in the axial direction at a portion other than the caulking portion.

According to this, the shaft and the plunger are integrally connected by a caulking portion of the plunger, and at least an axial line contact between the outer peripheral surface of the shaft and the inner peripheral surface of the insertion hole of the plunger. . Thus, the strength of the shaft against the plunger can be secured, and the shaft and the plunger can be prevented from swinging with respect to the plunger due to linear contact at least in the axial direction. Further, the insertion of the shaft and the plunger is a gap fitting including a gap of zero. Thus, the shaft and the plunger can be set at a predetermined position by setting the shaft and the plunger in the jig without relying on the press-fitting step, so that the caulking can be performed as it is. For this reason, it is not necessary to introduce a separate press-fitting facility.
Further, since temporary fixing by press fitting is not performed, even if the shaft is thin, it can be inserted without bending or buckling.

Further, when the invention according to claim 1 or 2 is carried out, when the caulking portion is provided at a plurality of positions (in the case of the invention according to claim 3), the retaining strength of the shaft or the shaft is prevented. Can be sufficiently ensured, and swinging of the shaft body or the shaft can be prevented.
In the case where the caulking portion is set on a plane substantially perpendicular to the center axis of the shaft or the shaft (in the case of the invention according to claim 4), a different direction (radial direction) with respect to the center axis. And the shaft body or the shaft is not pressed from different heights (axial positions), and the shaft body or the shaft is not inclined by caulking, so that even after the caulking, the center axis of the shaft body or the shaft is , Are fixed parallel to the central axis of the insertion hole. Thereby, the coaxiality between the shaft body or the shaft after the caulking and the insertion hole can be ensured with high accuracy.

Further, when the invention according to claim 1 or 2 is carried out, when the caulking portion is provided at one position (in the case of the invention according to claim 5), the shaft or the shaft is provided with an insertion hole. Since it is pressed and caulked in one direction, it is fixed by line contact at least in the axial direction between the caulked portion, the outer peripheral surface of the shaft body or the shaft, and the inner peripheral surface of the insertion hole. This ensures the strength of the shaft body against the cylindrical body and prevents the shaft body from swinging with respect to the cylindrical body by contact between the outer peripheral surface of the shaft body and the inner peripheral surface of the insertion hole of the cylindrical body. Can be prevented. In addition, the deformation of the outer shape of the plunger can be suppressed to a minimum by providing one caulking portion.

A feature of the present invention (a feature of the invention according to claim 6) is that, in a state in which the shaft is inserted into the insertion hole of the cylindrical body, the caulking is performed from the outer periphery of the cylindrical body toward the shaft. In the caulking method for integrally connecting the shaft and the cylindrical body, the caulking performed on the cylindrical body is performed at a plurality of locations and an axis (central axis) passing through the axis of the cylindrical body is formed. axis)
Is asymmetric with respect to.

According to this, the shaft body and the cylindrical body are brought into contact by the plurality of caulked portions of the cylindrical body and the plurality of contacts between the outer peripheral surface of the shaft body and the inner peripheral surface of the insertion hole of the cylindrical body. They are integrally connected.
With this, while ensuring the retaining strength of the shaft body against the cylindrical body, the outer peripheral surface of the shaft body and the inner peripheral surface of the insertion hole of the cylindrical body come into contact with each other at a plurality of places, so that the shaft body Swing can be prevented.

A feature of the present invention (a feature of the invention according to claim 7) is that, in a state where the shaft is inserted through the insertion hole of the cylindrical body, the caulking is performed from the outer periphery of the cylindrical body toward the shaft. In the caulking method for integrally connecting the shaft body and the cylindrical body, the caulking performed on the cylindrical body is performed at one place.

According to this, the shaft body and the cylindrical body are integrally connected by the swaged portion of the cylindrical body and the contact between the outer peripheral surface of the shaft body and the inner peripheral surface of the insertion hole of the cylindrical body. Is done. This allows
In addition to securing the retaining strength of the shaft against the cylindrical body, the outer peripheral surface of the shaft and the inner peripheral surface of the insertion hole of the cylindrical body come into contact with each other, thereby preventing the shaft from swinging with respect to the cylindrical body. Can be.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an electromagnetic valve A (liquid) having a plunger 10 as a cylindrical body made of a magnetic material and a shaft 20 as a shaft made of a non-magnetic material, which are integrally connected by a caulking method according to the present invention. (A solenoid valve used in a pressure circuit). In the solenoid valve A, the plunger 10 and the shaft 20 are urged by a spring S, and are seated on a valve seat 28 by a spherical valve portion 26 formed at the tip of the shaft 20. The plunger 10 and the shaft 20 are connected to the solenoid C
When the power is supplied to the shaft S, the valve portion 26 of the shaft 20 moves away from the valve seat 28 by moving against the spring S.

As shown in FIG. 2, the plunger 10 is provided with a two-sided width portion 12 on the outer peripheral surface of a cylinder, and an insertion hole 14 is provided in the center axis direction of the cylinder to a predetermined depth. I have. The inner diameter of the insertion hole 14 is set to an inner diameter through which the base portion 22 of the shaft 20 is inserted with a predetermined gap (for example, about 10 to 50 μm in the diameter direction) of the shaft 20. On the other hand, the shaft 20 is a solid cylinder, and the base 22 has two annular concave grooves 24 formed along the outer circumference.

By the way, the plunger 10 and the shaft 20
Are integrally connected by caulking using the jig 30 shown in FIG. The jig 30 is fixed to a base B installed horizontally and supports the plunger 10 and supports the same. The through-hole 34 supports the shaft 20 without having an interference. A pair of left and right punches 36 </ b> A that presses and caulks the surface width portion 12.
And a punch 36B, and a lateral hole 38 for slidably receiving the punches 36A and 36B.

The punch 36A and the punch 36B are formed of an iron-based member having a high hardness. In order to surely deform the plunger 10 and firmly fix the plunger 10 to the shaft 20,
A columnar convex portion 36a is provided on the center axis at each end. Further, the stroke amount pressed by the punches 36A and 36B and the outer diameter and height of the convex portion 36a affect the outer shape of the plunger 10 (the amount of diameter expansion in the direction orthogonal to the pressing direction), and the plunger 10 and the shaft 20 formed by swaging.
Shaft 2 with respect to the axis of the plunger 10 and the coupling force of
It is set in consideration of the amount of inclination of 0.

The lateral hole 38 is provided such that the central axes of the punches 36A and 36B are on a plane substantially orthogonal to the central axis of the shaft 20, and when the shaft 20 is set in the through hole 34, Groove 2 from the top of base B
4 and the height of the convex portion 36a to the central axis are the same. Further, as shown in FIG. 3B, the lateral hole 38 is in a state where the central axes of the punches 36A and 36B are not on the same line, that is, the central axis L of the punch 36A.
1 passes through the center axis L0 of the plunger 10, and the punch 36B
The center axis L2 is provided so as to be offset from the center axis L1 of the punch 36A by a predetermined amount D in the horizontal direction. The predetermined amount (offset amount) D is set mainly based on the outer diameter of the shaft 20.
If the outer diameter of the plunger is about 2 mm, it is set to about 0.5 mm. By setting in this way, the influence on the outer shape of the plunger 10, the coupling force between the plunger 10 and the shaft 20 by swaging, and the axis of the plunger 10 It is possible to optimize the amount of inclination of the shaft 20 with respect to.

In the caulking process using the jig 30 having the above configuration, first, the shaft 20 is erected on the through hole 34 of the jig 30 with the valve portion 26 downward, and the insertion hole 1 of the plunger 10 is inserted.
4 and the base 22 are inserted. Next, the two-face width portion 12 of the plunger 10 and the punches 36A and 36B are set on the support portion 32 of the jig 30 so as to face each other. In this state, when the pair of left and right punches 36A and 36B presses the two-face width part 12 of the plunger 10, the two-face width part 12 starts to be deformed. At this time, the punch 36A and the punch 3
Since the central axis of 6B is not on the same line, the plunger 10
The shaft 20 moves the plunger 1 in accordance with the deformation of the width across flats 12 due to the pressing of the punch 36B which is offset from the center of the plunger 1.
It moves in a direction (upward in FIG. 3) biased with respect to the 0 insertion hole 14. Then, punch 36A and punch 3
6B presses and deforms the width across flats 12, the width across flats 1
Shaft 2 at 2 deformed part (two caulked parts)
0 is fixed, and the inner peripheral surface of the insertion hole 14 and the outer peripheral surface of the shaft 20 are in line contact with each other at least in the axial direction (there may be surface contact when caulking is performed with a large force). ) The shaft 20 is fixed. The center of the width of the concave groove 24 of the shaft 20 and the central axis of the convex portion 36a of the punch 36A and the punch 36B have the same height from the upper surface of the base B. Engages with the groove 24.

For this reason, the plunger 10 and the shaft 20, which are integrally connected through the above-mentioned caulking process, have a deformed portion of the plunger 10 (two caulked portions).
The grooves 24 are engaged with each other, and a sufficient line contact length is secured even after swaging. Accordingly, the shaft 20 does not come off from the plunger 10 with the operation of the solenoid valve A, and swings between the plunger 10 and the shaft 20 (a factor that causes vibration when the solenoid valve A is used). Nothing to do.

The shaft 20 is set so as to have a predetermined gap between the inner peripheral surface of the insertion hole 14 of the plunger 10 and the outer peripheral surface of the shaft 20. For this reason, the insertion hole 14 and the base 22 are inserted without press fitting, and the shaft 20 is integrally connected without bending or buckling.
Also, there is no need to introduce a separate press-fitting facility, and there is no increase in production facility costs.

Further, the central axes of the punches 36A and 36B are located on a plane substantially orthogonal to the central axis of the shaft 20. As a result, even if caulking is performed, the shaft 2
0 does not occur and the center axis of the shaft 20 is fixed parallel to the center axis of the insertion hole 14 even after the caulking, so that the insertion hole 14 of the plunger 10 and the valve portion 26 of the shaft 20 Coaxiality and the like can be ensured with high accuracy. Therefore, the performance of the solenoid valve A (for example, the seat 2
8 and performance such as linear current-flow characteristics) can be stably obtained.

In the first embodiment, the punch 36
A center axis L1 of A passes through center axis L0 of plunger 10,
The central axis L2 of the punch 36B is the central axis L of the punch 36A.
1 and is horizontally offset by a predetermined amount D, and the both sides of the two-face width portion 12 of the plunger 10 are pressed to perform caulking. Instead of this, as shown in FIG. Alternatively, the portion and the direction in which the punch 36B presses the two-plane width portion 12 may be changed. Specifically, as shown in FIG. 4A, a pair of punches 36A and 36B are arranged with respect to the center axis L0 of the plunger 10.
Center axes L1 and L2 are horizontally shifted in the same direction (with caulking being symmetrical with respect to the center axis L0).
The swaging may be performed by changing the portion of the plunger 10 that presses the two-plane width portion 12. Further, as shown in FIG. 4B, a punch 36A passing through the center axis L0 of the plunger.
The center axis L2 of the punch 36B is arranged so as to have a predetermined angle θ with respect to the center axis L1 (the caulking is asymmetric with respect to the center axis L0), and the direction of pressing the two-plane width portion 12 is changed. Caulking may be performed. FIG.
Black arrows in (a) and (b) indicate the parts and directions to press.

Also in each of the embodiments shown in FIG. 4, the shaft 20 moves in a direction deviated with respect to the insertion hole 14 of the plunger 10 in accordance with the deformation of the two-face width portion 12 due to the caulking. The shaft 20 is fixed at a deformed portion (two caulked portions) of the two-plane width portion 12 and a line contact portion between the inner peripheral surface of the insertion hole 14 and the outer peripheral surface of the shaft 20. Thereby, the same effect as in the first embodiment can be obtained.

In the first embodiment, the pair of punches 36A and 36B each having a convex portion 36a at each end is used for caulking. However, as shown in FIG. It is also possible to carry out swaging using the punch 46B. In the second embodiment shown in FIG. 5 as well, the configurations of the shaft 20, the plunger 10, and the set jig 30 are the same as those of the first embodiment, and thus the same reference numerals are given and the description thereof is omitted.

As shown in FIG. 5 (a), the pair of punches of the second embodiment shown in FIG.
The punch 46A has a flat surface 46a that matches the two-sided width portion 12, and the punch 46B has a convex portion 46b. By the way, the flat surface 46a and the convex portion 46b are different in the surface pressure generated when pressing the two-plane width portion 12, so that the convex portion 4a is formed.
6b is largely deformed and the flat surface 46
The part in contact with a is hardly deformed. For this reason, the shaft 20 moves in a direction (left direction in FIG. 5B) that is deviated from the insertion hole 14 of the plunger 10 due to the deformation of the two-plane width portion 12 due to the protrusion 46b, and further deformation proceeds. The shaft 20 is fixed at the deformed portion (one caulked portion) of the two-plane width portion 12, and at least the line contact between the inner peripheral surface of the insertion hole 14 and the outer peripheral surface of the shaft 20 at least in the axial direction. Thus, the shaft 20 is fixed, and the deformed portion of the two-face width portion 12 is engaged with the concave groove portion 24. Accordingly, the plunger 10 and the shaft 20 can be integrally connected with each other while minimizing the deformation of the width across flats 12 due to swaging. For this reason, the same operation and effect as in the first embodiment can be expected in the second embodiment.

In the second embodiment shown in FIG. 5, the punch 46A having the flat portion 46a is employed. However, the flat portion 46a of the punch 46A is replaced with the convex portion 46b of the punch 46B. Adopted as the punch 46A
Is smaller than the pressing force of the punch 46B, the shaft 20 can be pressed and crimped in the direction of the smaller pressing force (the direction of the punch 46A). In this case, the same operation as in the first embodiment is performed. The effect can be expected.

In the second embodiment, the pair of punches 46A and 46B are caulked. Alternatively, as shown in FIG. 6, four punches, that is, flat portions are formed. 46A having 46a, and the convex portion 4
It is also possible to carry out swaging with 46B1, 46B2, 46B3 having 6b (indicated by black arrows in FIG. 6). In this case, the same effect as in the first embodiment can be obtained, except that the number of swaged portions is three and the number is increased, so that the retaining strength can be increased.

In the first and second embodiments, a predetermined gap (for example, about 10 to 50 μm) is formed between the inner peripheral surface of the insertion hole 14 of the plunger 10 and the outer peripheral surface of the shaft 20. In the present invention, the plunger 10 and the shaft 20 are formed.
May be inserted as long as the gap is inserted, and the gap at that time may be zero.

In the first and second embodiments, the present invention is applied to the connecting portion between the plunger 10 as a cylindrical body and the shaft 20 as a shaft. The present invention can be widely applied to a connection portion between the shape body and another shaft body, and is not limited to the above embodiment.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of a solenoid valve including a plunger and a shaft connected by the method of the present invention.

FIG. 2 is an enlarged view of a plunger and a shaft shown in FIG.

FIG. 3 is a schematic diagram showing a first embodiment of the present invention.

FIG. 4 is a schematic diagram illustrating a modification of a pressing portion and a pressing direction according to the first embodiment of the present invention.

FIG. 5 is a schematic view showing a second embodiment of the present invention.

FIG. 6 is a schematic view showing a modification of the pressing direction according to the second embodiment of the present invention.

[Description of Signs] 10: plunger (cylindrical body), 12: width across flats, 14:
Insertion hole, 20: shaft (shaft), 22: base, 24 ...
Recessed groove part, 26 ... valve part, 30 ... jig, 32 ... support part, 34
... through holes, 36A, 36B, 40 ... punches.

Claims (7)

[Claims] 1. A shaft body and a cylindrical body are integrally connected by caulking from the outer periphery of the cylindrical body to the shaft body in a state where the shaft body is inserted into an insertion hole of the cylindrical body. In the crimping method, the shaft body and the cylindrical body are inserted into the gap including zero gap, and the cylindrical body is subjected to caulking, so that a portion other than the caulking portion is formed. A swaging method, wherein the outer circumferential surface of the shaft body and the inner circumferential surface of the insertion hole in the cylindrical body are in line contact at least in the axial direction. 2. By caulking from the outer periphery of the plunger to the shaft in a state where the base of the shaft having the valve portion at the tip is inserted into the insertion hole of the plunger,
In a caulking method for integrally connecting a shaft and a plunger in an electromagnetic valve, the insertion of the shaft and the plunger is a clearance fit including zero clearance,
By performing caulking on the plunger, the outer peripheral surface of the shaft and the inner peripheral surface of the insertion hole in the plunger are brought into line contact at least in the axial direction at a portion other than the caulked portion. A swaging method. 3. The caulking method according to claim 1, wherein the caulking portion is provided at a plurality of positions. 4. The caulking method according to claim 3, wherein the caulking portion is set on a plane substantially perpendicular to a central axis of the shaft or the shaft. 5. The caulking method according to claim 1, wherein the caulking portion is provided at one position. 6. The shaft body and the cylindrical body are integrally connected by caulking from the outer periphery of the cylindrical body toward the shaft body in a state where the shaft body is inserted into the insertion hole of the cylindrical body. In the caulking method, the caulking performed on the cylindrical body is performed at a plurality of positions and is asymmetric with respect to an axis passing through the axis of the cylindrical body. 7. A shaft body and a cylindrical body are integrally connected by caulking from the outer periphery of the cylindrical body to the shaft body in a state where the shaft body is inserted into the insertion hole of the cylindrical body. In the caulking method, a caulking process performed on the cylindrical body is performed at one place.