JP2002292485A - Method for welding process component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for welding press components capable of not generating cracks or peeling. SOLUTION: A small end surface (33a) of the press components (33) is arranged outside a small end surface (13a) of the cutting components (13) and simultaneously, an irradiation source of the laser light (8) is allocated on the cutting components (13) side and the laser light (8) from the irradiation source is characterized by the feature that the laser light is obliquely irradiated to an abutting surface (P) of an abutting portion (41).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for welding a pressed part, and more particularly, to a method for welding a pressed part, such as an internal part of a pressure sensor.
The present invention relates to a method for welding pressed parts, which is suitable for firmly welding thin rolled members that are susceptible to repeated pressure fluctuations.

[0002]

2. Description of the Related Art Conventionally, arc welding has been widely used to butt and weld two members. This arc welding has the feature that the width of the welded portion can be widened, but the carbon rods used as electrodes are worn out and must be replaced regularly, which is troublesome and requires mass production. There is also a problem that it is not suitable for. Further, in arc welding, the temperature of a welded portion is high in a wide range. Therefore, particularly when a thin plate material is welded, the temperature may be too high and a hole may be formed in the welded portion. Therefore, instead of arc welding, the butt portion is sometimes welded by high-density energy such as a laser beam or an electron beam. According to such a welding method, high-density energy irradiation can be performed, so that a narrow range can be spot-melted and integrated. In addition, since mass production is possible, there is an advantage that production cost is greatly improved.

FIG. 5 shows a pressure sensor 2 as a preferable product for performing such welding. The pressure sensor 2 is connected to a pressure chamber 7 connected to the passage 6 of the joint 4.
The thin metal diaphragm 3 is accommodated therein, and a protective cover 8 is disposed outside thereof. Further, the pressure sensor 2 is configured such that the outer peripheral edge of the diaphragm 3 and the outer peripheral edge of the protective cover 8 superposed thereon are hermetically fixed by welding, so that the central opening 12 of the element body 10 is formed.
In a portion, between the hermetic glass 14 and the diaphragm 3, a liquid sealing chamber 16 in which oil is sealed is defined. The fluid pressure transmitted from the passage 6 into the pressure chamber 7 passes through the communication hole of the protective cover 8 and
Is pressed, and this pressing force is detected by the sensor chip 20 in the liquid sealing chamber 16.

In such a pressure sensor 2, the dish-shaped member 22 provided at the end of the joint 4 is a member separate from the main body, and the dish-shaped member 22 is attached to the element main body 10 by laser welding. It is fixed. When laser welding is performed between such two members, as shown in FIG. 6, the fore end surface 22a of the dish-shaped member 22 and the fore end surface 10a of the element body 10 are arranged flush with each other. Light 2
4 was irradiated from the side.

[0005]

The welded portion 26 welded by the laser beam 24 is generally formed in a parabolic cross section. Even if it seems to be welded tightly, if the vertex A of the welded portion 26 exists on the element body 10 side from the butt surface P inside, the welded portion 2
For example, when a pressure is applied from the outside, the welded portion is peeled off from the weak portion.

That is, the dish-shaped member 22 of the joint 4 is formed by punching a thin plate material by a press die. Therefore, the original material is cut out from the rolled metal material. As described above, the dish-shaped member 22 made of the rolled material is moved in the rolling direction, that is, in FIG.
Shear deformation has occurred in the X-X line direction. However, in the pressure sensor 2, as indicated by the arrow, the pressure for expanding the pressure chamber 7 from the inside repeatedly acts, so when the welded portion 26 is placed in such an environment, the internal pressure is received. There was a problem that the welded portion 26 came off.

[0007] This peeling is particularly likely to occur on the dish-shaped member 22 side, and the peeling is performed on the dish-shaped member 22 side by XX.
The boundary line C- of the welded portion 26 extending in substantially the same direction as the line direction
This occurs along the line C ′. The present invention has been made in view of the above circumstances, and provides a method for welding a pressed part that does not cause cracking or peeling even when a welded portion is arranged in a portion where pressure fluctuation is likely to occur. The purpose is.

[0008]

In order to achieve the above object, the present invention provides a press part 33 formed by pressing a rolled material and a butt 41 between another part 13 and a laser beam from outside. In the welding method of forming the pressure chamber 29 inward by welding with the laser beam 8, the fore end face 33 a of the press part 33 is disposed outside the fore end face 13 a of the other part 13, and the laser light 8 An irradiation source is arranged on the other component 13 side, and the laser light 8 from the irradiation source is irradiated with the laser beam 8 inclined with respect to the butting surface P of the butting portion 41.

Here, in the present invention, it is preferable that the inclination angle α of the laser beam 8 with respect to the abutting surface P is 5 ° to 45 °. Further, according to the present invention, a butt portion 41 between a pressed part 33 formed by pressing a rolled material and another part 13 is welded by a laser beam 8 from outside, and a pressure chamber 29 is defined inside. In the welding method, the fore end face 33a of the pressed part 33 is
3 and the irradiation source of the laser light 8 is arranged on the press part 33 side, and the laser light 8 from this irradiation source is applied to the butting surface P of the butting portion 41. It is characterized by irradiating with tilting.

Here, it is preferable that the inclination angle β of the laser 8 with respect to the abutting surface P is 5 ° to 45 °. According to such a method, it was confirmed that the welded structure was good and no peeling or cracking occurred.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a liquid ring type pressure sensor in which a welding method according to an embodiment of the present invention is performed. This liquid ring type pressure sensor 1 is configured by a combined body of a pressure detecting element 5, a joint 9, and a connector housing 11.

The pressure detecting element 5 has a metal element main body 13, and a central opening 1 of the element main body 13.
The hermetic glass 17 is fitted into and fixed to 5. On one end face (lower bottom face) of the pressure detecting element 5, a liquid seal in which oil is sealed between an outer peripheral edge of the metal diaphragm 19 and a protective cover 21 having a communication hole stacked thereon. A chamber 23 is defined.

A one-chip sensor chip 25 is fixed to the surface of the hermetic glass 17 on the side of the pressure chamber 23 by an adhesive. On the other hand, the joint 9 is provided with a dish-shaped member 33 made of a separate member at the distal end.
This dish-shaped member 33 is formed of an extremely thin material, unlike the case of the element body 13.

In such a liquid ring type pressure sensor 1, the pressure transmitted from the passage 27 of the joint 9 into the pressure chamber 29 is
The pressure is detected by being transmitted to the diaphragm 19 through the communication hole of the protective cover 21. In FIG. 1, reference numeral 31 denotes a cylindrical caulking cover having both ends caulked, and the cover 31 integrates the combined body of the pressure detecting element 5 and the joint 9 with the connector housing 11. I have.

The welding method of the present invention is applied between a thin plate-shaped member 33 and an element body 13 having a sufficient thickness. Here, the dish-shaped member 33
Is formed by pressing a rolled material, and the element body 13 is formed by cutting. Therefore,
Inside the dish-shaped member 33, shear deformation occurs in the XX line direction which is the rolling direction shown in FIG.

Prior to carrying out the welding method of this embodiment,
The dish-shaped member 33 has a slightly larger diameter than the element body 13. Then, as shown in FIG. 2, the fore end face 33 a of the dish-shaped member 33 is disposed outside the fore end face 13 a of the element body 13. On the other hand, laser light 8
Is arranged closer to the element body 13 than the abutting surface P.

In this embodiment, the inclination angle α of the laser beam 8 with respect to the abutting surface P is in the range of 5 to 45 °, preferably 5 to 15 °. Further, the center W1 of the width W of the laser beam 8 exists on the dish member 33 side and is biased toward the dish member 33 side. In the welding method of this embodiment,
The laser beam 8 is emitted from the irradiation source arranged as described above, and the butted portion 41 is welded with the width W. FIG. 3 shows a sectional structure of a welded portion welded by such a method. As shown in FIG. 3, the welded portion 35 of the butted portion 41 is formed in a shape similar to a parabola in cross section, but its vertex A is located on the dish-shaped member 33 side where the rolled material is pressed. ing. Therefore, on the dish-shaped member 33 side, the boundary line AA ′ of the welded portion 35 extends in a direction substantially orthogonal to the rolling direction XX. Accordingly, the welded portion on the boundary line AA ′ acts to prevent the force when the dish-shaped member 33 is about to be peeled, thereby effectively separating the dish-shaped member 33. Is prevented.

Therefore, according to this embodiment, the pressure chamber 2
Even if the pressure in the pressure chamber 9 increases and a force acts to expand the pressure chamber 29 from the inside, the separation of the dish-shaped member 33 can be prevented. Therefore, the function of the pressure sensor is not impaired. As mentioned above, although one Example of this invention was described, this invention is not limited to the said Example at all.

For example, in the above embodiment, the welding structure has been described by taking the pressure sensor as an example. However, the present invention is of course applicable to other products. Also, even with a pressure sensor,
It is needless to say that the present invention is not limited to the welding portion between the dish-shaped member 33 and the element body 13. In short, one plate is made of rolled material and is extremely thin compared to the other members.
The present invention can be preferably applied to a welding structure where internal pressure acts. Therefore, other members to be welded to the rolled material are not limited to cut products, and may be cast products.

Further, in the above embodiment, the fore end face 33a of the dish-shaped member 33 is projected outward with respect to the element body 13, but it can be installed in the reverse manner. That is, as shown in FIG. 4, the fore end surface 33 a of the dish-shaped member 33 can be disposed inside the fore end surface 13 a of the element body 13. In that case, the irradiation source of the laser light 8 is arranged on the dish-shaped member 33 side from the butting surface P, and the inclination angle β of the laser light 8 with respect to the butting surface P is 5 ° to 45 °, preferably 5 ° to 15 °. ° is preferred.

As described above, if the element body 13 is protruding and the inclination angle β is set in the above range, the force for peeling the welded portion 35 along the XX line direction (rolling direction). Is a boundary line A in a direction substantially orthogonal to this.
It is canceled by the force acting on 2-A3. Therefore,
Cracking and peeling of the welded portion 35 can be prevented.

As described above, the present invention can be preferably applied to welding of a rolled material having a small thickness.

[0023]

As described above, according to the method for welding pressed parts according to the present invention, the welded portion between a thin press-formed product made of a rolled material and another cut part is located at a position where internal pressure acts. Even if it is put, it is possible to prevent the welded portion from being cracked or peeled off.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a pressure sensor in which a welding method according to an embodiment of the present invention has been performed.

FIG. 2 is a partially enlarged view of a pressure sensor in which the welding method according to the embodiment is performed.

FIG. 3 is an enlarged view of a welded portion formed by the welding method of the embodiment.

FIG. 4 is an enlarged view of a weld formed by a welding method according to another embodiment of the present invention.

FIG. 5 is a sectional view of a pressure sensor to which a conventional welding method is applied.

FIG. 6 is an enlarged view of a welded portion welded by a conventional welding method.

[Brief description of reference numerals]

 DESCRIPTION OF SYMBOLS 1 Pressure sensor 8 Laser beam 13 Cutting part (element main body) 13a Fore end face 29 Pressure chamber 33 Pressed part (dish-shaped member) 33a Fore end face 41 Butt part α, β Tilt angle P Butt face

Claims (4)

[Claims] 1. A butt portion (41) of a pressed part (33) formed by pressing a rolled material and another part (13) is welded by a laser beam (8) from outside.
In a welding method for defining a pressure chamber (29) inward, a fore end face (33a) of the pressed part (33) is arranged outside of a fore end face (13a) of the other part (13); The irradiation source of the laser light (8) is used as the other component (13).
A laser light (8) from the irradiation source and irradiating the laser light (8) from the irradiation source while being inclined with respect to the butting surface (P) of the butting portion (41). 2. The method according to claim 1, wherein an inclination angle (α) of the laser beam (8) with respect to the abutting surface (P) is 5 ° to 45 °. 3. A butted portion (41) of a pressed part (33) formed by pressing a rolled material and another part (13) is welded by a laser beam (8) from outside.
In a welding method for defining a pressure chamber (29) inward, a fore end face (33a) of the pressed part (33) is arranged inside a fore end face (13a) of the other part (13), The irradiation source of the laser beam (8) is
3) A welding method for a pressed part, wherein the laser light (8) from the irradiation source is irradiated with the laser light (8) from the irradiation source inclined with respect to the butting surface (P) of the butting portion (41). . 4. The method according to claim 3, wherein an inclination angle (β) of the laser (8) with respect to the butt surface (P) is 5 ° to 45 °.