JP3502960B2 - Welding method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding method capable of stabilizing a welded portion and its peripheral portion by a simple method and increasing the welding strength (peeling load) thereof.

[0002]

2. Description of the Related Art In the conventional welding method, when a first member is fixed to a second member by laser welding or electron beam welding,
Welding is performed by managing welding conditions such as welding temperature and welding time.

[0003]

However, in the conventional welding method, since the welding condition is controlled and the welding is performed, the welding strength (peeling load) determined by the welding condition can be obtained. When welding strength (peeling load) is required, there is a problem that it cannot be dealt with.

[0004]

The object of the present invention is to obtain a welding strength (peeling load) which is equal to or higher than a welding strength (peeling load) determined by welding conditions.
Is to be obtained.

[0005]

Means for Solving the Problems A welding method according to the present invention is a method for forming a primary vulcanized rubber on a predetermined portion of a first member.
By the next vulcanization process, laser welding and electron beam welding,
Welding process for fixing one member to the second member, and the fixed first
The member and the second member are heated at a temperature below 300 degrees Celsius.
It is equipped with a heating process, and by this heating process the rubber of primary vulcanization is
While secondary vulcanization, to stabilize its periphery welded portion of this, those that increase the welding strength (peeling load).

[0006]

[0007]

[0008]

[0009]

[0010]

EXAMPLE FIG. 1 (a) and FIG. 1 (b) are a front side plan view showing a rubber-welded member manufactured by using an example of a welding method according to the present invention and a sectional view taken along the line A--A. FIG. 2 is a plan view of the back side of FIG. To simplify the description, one leaf spring integrated core with rubber is illustrated as an example. First, in FIGS. 1 (a), 1 (b) and 2, 1 is a first member made of a leaf spring, and the first member 1 has a detailed plan view thereof as shown in FIG. A ring-shaped outer peripheral packing portion 1a, a circular valve seal portion 1c having a central hole 1b, and, for example, three radial arm portions 1
d, 1e, 1f. The three radial arms 1d, 1e, 1f connect the ring-shaped outer peripheral packing portion 1a and the valve seal portion 1c.

Reference numeral 2 is a second member which functions as a movable iron core. This second member 2 is shown in a detailed plan view of FIG.
4B, a cross-sectional view taken along line BB of FIG.
Cylindrical part 2a and collar part 2 fixed to one end of this cylindrical part 2a
b. 3 is a packing rubber, and the packing rubber 3 is vulcanized and adhered to both surfaces of the ring-shaped outer peripheral packing part 1a of the first member 1. Reference numeral 4 is a rubber for valve sealing, and the rubber 4 for valve sealing is vulcanized and adhered to the front side surface of the circular valve sealing portion 1c (see FIG. 3) of the first member 1.

5 is a rubber for a spring guide and a seal,
The spring guide / seal rubber 5 is vulcanized and adhered to the back side surface of the circular valve seal portion 1c (see FIG. 3) of the first member 1, and the central hole 1b of the first member 1 is used.
(See FIG. 3) is integrally connected to the back side of the rubber 4 for valve seal. And this rubber for rubber guide 5
Serves as a spring guide (not shown) protruding to the back side surface and also serves as a stopper for preventing the rubber 4 for the valve seal from coming off. 6a to 6f are welding points, and this welding point 6a
~ 6f is welded by laser welding, electron beam welding,
The first member 1 and the second member 2 are firmly integrated.

Next, a manufacturing process of the rubber-welded member having the above structure will be described. First, as shown in FIG. 5, a plurality of, for example, four first members 1 (see FIG. 3), which are leaf springs, are formed in the spring holder 7 by pressing. Incidentally, 7a is a through hole for positioning. A spring holder 7 having four first members 1 made of leaf springs is set in a mold (not shown). Then, by pouring the rubber for primary vulcanization into a mold (not shown), the rubber for packing 3 is bonded to both surfaces of the ring-shaped packing portion 1a of the first member 1 made of a leaf spring in a state of primary vulcanization. At the same time, the valve sealing rubber 4 is bonded to one surface of the circular valve sealing portion 1c of the leaf spring 1, and the spring guide / sealing rubber 5 is bonded to the other surface of the circular valve sealing portion 1c in a state of primary vulcanization. In addition,
To the first member 1 (see FIG. 3), the primary vulcanized packing rubber 3, the primary vulcanized valve seat rubber 4, and the primary vulcanized spring guide / sealing rubber 5 are bonded together. The first member with sulfur rubber is used.

Then, a second member 2 (see FIG. 4) which functions as a movable iron core is prepared in advance by pressing.
Are set on the back surface of each of the four first vulcanized rubber-equipped first members (see FIG. 1B) formed on the spring holder 7, and the welding points 6a to 6f are welded by laser welding or electron beam welding. By doing so, the second member 2 functioning as the movable iron core is firmly integrated with the first member with a primary vulcanized rubber having the first member 1 made of the leaf spring, and the primary member functioning as a leaf spring integrated core. It can be a welded member with vulcanized rubber.

Then, the four primary vulcanized rubber-welded members each of which functions as a leaf spring integrated core are subjected to a predetermined temperature (a temperature lower than the welding temperature in the welding process) and a time, for example, 300 ° C. for 12 hours. When heated by a heating means (not shown), the welded portions 6a to 6f and the peripheral portions of the welded portions 6a to 6f are corrected for thermal strain, and a non-equilibrium and unstable structure is stable and sticky, Welding strength (peeling load) can be increased. Moreover, the rubber 3 for the primary vulcanization packing, the rubber 4 for the primary vulcanization valve seal, and the rubber 5 for the primary vulcanization spring guide / seal are each secondary vulcanized, and the residual crosslinking agent can be evaporated. . In this way, the welding member with rubber that functions as the leaf spring integrated core can be produced, and therefore, it is separated into four welding members with rubber by the unillustrated separating means.

Further, in the following description, in the case where four first members 1 (leaf springs) are provided in the spring holder 7 and four welding members with rubber (leaf spring integrated cores) are manufactured in one manufacturing process. However, without being limited to this, 1
The same can be done when N pieces (2 pieces, 3 pieces, or 5 pieces or more) are provided and N pieces of rubber-welded members (leaf spring integrated cores) are manufactured in a single manufacturing process. Of course. Further, although the first member 1 is a leaf spring and the second member 2 is a movable iron core, it is needless to say that the present invention is not limited to this. Further, although the case where the primary vulcanized rubber is adhered to the first member 1 has been described, the present invention is not limited to this, and the same can be applied to the case where the vulcanized rubber is adhered to the first member 1.

[0017]

As described above in detail, according to the welding method of the present invention, the welding portion and its peripheral portion are stabilized, and the welding strength (peeling load) or more determined by welding conditions The peeling load) can be obtained, and further, the rubber provided by the primary vulcanization can be subjected to the secondary vulcanization by the heating step without providing the secondary vulcanization step.

[Brief description of drawings]

FIG. 1 is a front side plan view showing a welded member with rubber manufactured by using an embodiment of a welding method according to the present invention and its AA.
FIG.

FIG. 2 is a backside plan view showing the single rubber-welded member shown in FIG.

3 is a detailed plan view of the first member shown in FIG. 1. FIG.

FIG. 4 is a detailed plan view of the second member shown in FIG. 1 and its BB cross-sectional view.

FIG. 5 is a plan view of a spring holder.

[Explanation of symbols]

1st member (leaf spring) 2 2nd member (movable iron core) 3 Rubber for packing 4 Rubber for valve seal 5 Rubber for spring guide and seal 6 welding points 7 Spring holder

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-186634 (JP, A) JP-A-5-293684 (JP, A) JP-A-58-201630 (JP, A) JP-A-3- 281078 (JP, A) Japanese Patent Publication 4-17142 (JP, B2) Japanese Patent Publication 62-20021 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) B23K 26/00-26 / 42

Claims (2)

(57) [Claims] 1. A primary vulcanization step of forming a rubber for primary vulcanization on a predetermined portion of a first member, and a welding step of fixing the first member to a second member by laser welding or electron beam welding. A heating step of heating the first member and the second member at a temperature of 300 degrees Celsius or less is provided, and by this heating step, the rubber of the primary vulcanization is secondarily vulcanized and the welded portion and its peripheral portion are stabilized. Welding method characterized by: 2. The welding method according to claim 1, wherein the first member is a spring material.