JPH0796546A - Ultrasonic welding method - Google Patents

Abstract

PURPOSE:To improve welding strength, by a method wherein a first flat surface and a first slope are provided on a joint of a first member, a second flat surface and a second slope are provided on a joint of a second member, a projected part is provided on either the first or the second flat surface and the flat surfaces and slopes of the first and second members are joined to each other. CONSTITUTION:A first flat surface 11 and a first slope 12 which is extended toward the second member 2 from an end part of the first flat surface 11 and sloped in such a way that the thickness becomes less toward the second member 2, are formed on a joint A of the first member 1. Then the second flat surface 21 joined to the first flat surface 11 and the second slope 22 joined to the first slope 12 are formed on a joint B of the second member 2. Then a wedgy protrusion 10 is formed on the first flat surface 11. Then ultrasonic welding between the first flat surface 11 and second flat surface 21 and between the first slope 12 and the second slope 22 are performed through the protrusion 10. Consequently, the welding area can be taken sufficiently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic welding method for ultrasonically welding a joint surface of a first member and a joint surface of a second member.

[0002]

2. Description of the Related Art In a conventional ultrasonic welding method for ultrasonically welding two members (a first member and a second member), as shown in FIG. 10, the joining surfaces of the two members are respectively formed into one flat surface. And a wedge-shaped convex portion was provided on one of the flat surfaces. By the way, the reason why the wedge-shaped convex portion is provided is to make the contact surfaces of the two members small so that ultrasonic welding can be performed with a small ultrasonic energy. In this way, a wedge-shaped convex portion is provided on the joint surface as shown in FIG.
In the case of the joint surface of 0, a large ultrasonic energy is not required, but there is a problem that the joint surface is easily displaced laterally.
Therefore, in general, a fitting type as shown in FIG. 11 is adopted, that is, the joint surfaces of the two members are constituted by two flat surfaces with different steps, respectively, to prevent lateral displacement of the joint surfaces. There is. Incidentally, FIG. 10 shows the flat surface 1 of the first member 101.
01a and the flat surface 102a of the second member 102 are ultrasonically welded, and FIG. 11 shows the flat surfaces 101a and 101b of the first member 111 and the flat surface 1 of the second member 102.
The case where 02a and 102b are ultrasonically welded is shown. In the figure, 100 and 110 are wedge-shaped convex portions.

[0003]

However, in the conventional ultrasonic welding method, since the ultrasonic welding is performed only by the thickness of two members, the welding strength is low and improvement is desired. In particular, when ultrasonically welding members having narrow widths (thin thicknesses), there is a problem that sufficient welding strength cannot be obtained by the conventional welding method. The present invention has been made in view of the above circumstances, and an object thereof is to provide an ultrasonic welding method having high welding strength.

[0004]

An ultrasonic welding method of the present invention is to ultrasonically weld a joint surface of a first member and a joint surface of a second member, the first characteristic of which is that On the joint surface of the first member, a first flat surface and an end portion of the first flat surface extending toward the second member side, and the second member side is closer to the first member.
A flat surface and a first inclined surface that is separated laterally laterally;
A second flat surface that is joined to the first flat surface and a second inclined surface that is joined to the first inclined surface are formed on the joint surface of the member, and the first flat surface or the second flat surface is formed. It is a point that a convex portion is formed on either one and the first flat surface and the second flat surface, and the first inclined surface and the second inclined surface are ultrasonically welded. A second feature is that each of the first member and the second member has a bottomed tubular shape, and the end surface of the opening is the joint surface, and the joint surface of the first member is
In order from the inside to the outside, the first flat surface, the first inclined surface, and a third flat surface for non-welding that extends laterally outward from the outer end of the first inclined surface are provided. In addition, the second flat surface, the second inclined surface, and the outer end of the second inclined surface are laterally outward from the inner surface to the outer surface of the joint surface of the second member. A fourth flat surface for non-welding that extends in a vertical direction, and the distance between the first flat surface and the third flat surface is smaller than the distance between the second flat surface and the fourth flat surface. There is a point to form. The third feature is
The intersection angle of the first flat surface and the first inclined surface is formed to be larger than the intersection angle of the second flat surface and the second inclined surface.

[0005]

According to the first feature of the present invention, the first member of the first
The first flat surface and the second flat surface are ultrasonically welded to each other via the convex portion provided on either the flat surface or the second flat surface of the second member, and the first inclination of the first member. The surface and the second inclined surface of the second member are ultrasonically welded. Therefore, the ultrasonic welding of the joint surface of the first member and the joint surface of the second member is performed by ultrasonic welding of the first flat surface of the first member and the second flat surface of the second member and the first welding of the first member. The welding is performed by ultrasonic welding of the inclined surface and the second inclined surface of the second member, so that a sufficient welding area can be obtained as compared with the conventional welding method (for example, the welding method shown in FIG. 10 or 11). It will be possible to take. According to the second feature, the non-welding third flat surface of the first member and the non-welding fourth flat surface of the second member are respectively a bottomed tubular first member and a bottomed tube. The outer burrs that are respectively provided on the outer sides of the second members and are generated during ultrasonic welding of the first member and the second member are the third flat surface for non-welding and the fourth burr for non-welding. It will be immersed between the flat surface. According to the third feature, the intersection angle between the first flat surface and the first inclined surface is formed to be larger than the intersection angle between the second flat surface and the second inclined surface. , The first inclined surface and the second
The contact surface of the inclined surface can be made smaller, and ultrasonic welding of the first inclined surface and the second inclined surface is performed from the first flat surface side of the first inclined surface, that is, from the second flat surface side of the second inclined surface. , Will be done gradually.

[0006]

According to the first feature of the present invention, the welding area can be made sufficiently wide as compared with the conventional welding method (for example, the welding method shown in FIG. 10 or FIG. 11). I came to be able to improve. According to the second feature, since the burr can be immersed between the third flat surface for non-welding and the fourth flat surface for non-welding, the molten burr sticks out from the housing, It has become possible to prevent such problems that the appearance of the item is significantly impaired, or that the burr damages other products. According to the third feature, since the contact surfaces of the first inclined surface and the second inclined surface can be made small, good welding can be performed with a small ultrasonic energy.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the ultrasonic welding method of the present invention is applied to ultrasonic welding of a case of an anti-theft device will be described below with reference to the drawings. FIG. 3 shows the structure of the case of the anti-theft device, which is the joint surface A of the top case 1 as the first member and the joint surface B of the bottom case 2 as the second member.
And are ultrasonically welded together. That is,
Each of the top case 1 and the bottom case 2 has a bottomed tubular shape, and the end surfaces of the opening are joint surfaces A and B.

As shown in FIG. 1, the joint surface A of the top case 1 has a first flat surface 11 and an end portion of the first flat surface 11 extending toward the bottom case 2 side. The first flat surface 11 is formed on the joint surface B of the bottom case 2 by forming the flat surface 11 and the first inclined surface 12 separated laterally.
Forming a second flat surface 21 joined to the first inclined surface 22 and a second inclined surface 22 joined to the first inclined surface 12. Then, the wedge-shaped convex portion 10 is formed on the first flat surface 11. Therefore, the first flat surface 11 and the second flat surface 2
1, and the first inclined surface 12 and the second inclined surface 22 are ultrasonically welded.

Moreover, the first flat surface 11 and the first flat surface 11 are joined to the joining surface A of the top case 1 in order from the inside to the outside.
The inclined surface 12 and the non-welding third flat surface 13 extending laterally outward from the outer end of the first inclined surface 12 are provided, and the joint surface B of the bottom case 2 is provided from the inside. The second flat surface 21 and the second inclined surface 2 are sequentially arranged outward.
2, and a non-welding fourth flat surface 23 extending laterally outward from the outer end of the second inclined surface 22. However, the interval h ₁ between the first flat surface 11 and the third flat surface 13 is set to the second flat surface 21 and the fourth flat surface 2
It is formed so as to be smaller than the interval h ₂ with respect to 3.

When the joint surface A of the top case 1 and the joint surface B of the bottom case 2 are ultrasonically welded, as shown in FIG. 2, a groove k having a width h is formed on the outside of the housing. However, h≈h ₂ −h ₁ . At this time, the melted burs squeeze out on both sides e, f of the joint surfaces A, B, but the burrs on the f side will be immersed in the groove k. Therefore, this prevents the melted burr from sticking out of the housing, significantly impairing the aesthetic appearance of the housing, or damaging a product to which the anti-theft device is attached due to the burr.

The intersection angle α ₁ between the first flat surface 11 and the first inclined surface 12 is defined as the second flat surface 21 and the second flat surface 21.
It is formed to be larger than the intersection angle α ₂ of the inclined surface 22. α ₁ > α ₂ Accordingly, the ultrasonic welding of the first inclined surface 12 and the second inclined surface 22 is performed from the first flat surface 11 side of the first inclined surface 12, that is, the second flat surface of the second inclined surface 22. It will be gradually performed from the 21st side.

[Other Embodiments] As shown in FIG. 4, on either one or both of the first inclined surface 12 and the second inclined surface 22 of the above embodiment,
Fine irregularities may be provided so that welding of the inclined surface can be performed with a small amount of energy. In the above embodiment, the wedge-shaped convex portion 10 is formed on the first flat surface 11, but the wedge-shaped convex portion 10 does not necessarily have to be wedge-shaped, and its shape can be variously changed. Also, the second
The convex portion 10 may be formed on the flat surface 21. In the above embodiment, the first flat surface 11 and the third flat surface 13
The spacing h ₁ between, but are formed to be smaller than the interval h ₂ between the second flat surface 21 and the fourth flat surface 23, h ₁ =
h ₂ so that the third flat surface 13 and the fourth flat surface 2
3 may be ultrasonically welded. In ultrasonic welding of the top case 1 and the bottom case 2 of the above embodiment, as shown in FIGS. 5 and 6, the welding positions of the welding surface A of the top case 1 and the welding surface B of the bottom case 2 are not displaced. In addition, the top case 1 and the bottom case 2 may be provided with the projections P1 and Q1 for welding alignment, and the recesses P2 and Q2 that are taper-fitted to the projections P1 and Q1. By forming the projections P1, Q1 and the recesses P2, Q2 for welding alignment into the shapes shown in FIG. 7 or FIG. 8, the projections P1, Q1 and the recesses for welding alignment are formed at the time of welding. P2 and Q2 may be welded to each other to increase the strength during welding.

Hereinafter, based on FIGS. 7 and 8, the convex portions P1,
Specific configurations of Q1 and the recesses P2 and Q2 will be described.
In FIG. 7, the convex portions P1 and Q1 are formed by a tapered truncated cone that projects from the flat surface 15 of the top case 1 to the bottom case 2 side. The flat surface 16 is formed. The flat surface 1 is provided on the side of the recesses P2 and Q2 provided in the bottom case 2.
5, a flat surface 25 joined to the outer peripheral surface 14, a tapered outer surface 24 joined to the outer peripheral surface 14, and a flat surface 26 joined to the flat surface 16. Then, the intersection angle α ₃ between the flat surface 15 and the tapered outer peripheral surface 14 is set to be larger than the intersection angle α ₄ between the flat surface 25 and the tapered outer peripheral surface 24, so that the taper outer peripheral surface 14 and the taper outer peripheral surface 24 are separated from each other. The contact surface is small. However, in this case, the distance h ₃ between the flat surfaces 15 and 16 is made equal to the distance h ₄ between the flat surfaces 25 and 26, and the width h ₁₁ is made larger than the width h ₂₁ , Flat surface 15 and flat surface 25, tapered outer peripheral surface 14
The tapered outer peripheral surface 24 and the flat surface 16 and the flat surface 26 are welded to each other. By setting the interval h ₃ smaller than the interval h ₄ , the flat surface 15 and the flat surface 25, the tapered outer peripheral surface 14 and the tapered outer peripheral surface 24 are welded, and the flat surface 16 and the flat surface 26 are not welded. Alternatively, by making the interval h ₃ larger than the interval h ₄ , the tapered outer peripheral surface 14, the tapered outer peripheral surface 24, the flat surface 16 and the flat surface 26 are welded, and the flat surface 15 and the flat surface 25 are welded. You may decide not to.

In FIG. 8, the convex portions P1 and Q1 are
From the flat surface 18 of the case 1 to the side of the bottom case 2
The outer peripheral surface 17
And a flat surface 19 are formed. Provided on the bottom case 2
The flat surface 18 is joined to the recesses P2 and Q2 side.
Flat surface 28 and a taper joined to the outer peripheral surface 17
-The outer peripheral surface 27 and the flat surface 29 joined to the flat surface 19
And are formed. As a result, the outer peripheral surface 17 and the taper
-The contact surface of the outer peripheral surface 27 is made small. However, this
In this case, the distance h between the flat surfaces 18 and 19_FiveA flat surface
Interval h between 28 and flat surface 29₆Equal to and width
h₁₂Width h_{twenty three}Greater than and width h _{twenty two}Smaller than
(For example, h₁₂= (H_{twenty two}+ H_{twenty three}) / 2), with the flat surface 18
Flat surface 28, outer peripheral surface 17 and tapered outer peripheral surface 27, and flat surface
The carrier surface 19 and the flat surface 29 are configured to be welded respectively.
There is. Note that in FIG. 8 as in FIG._FiveTo
Interval h₆Welding by changing the magnitude relationship
The surface can be variously changed.

The projection P for welding position alignment
1, Q1 (frustum or cylinder), and its protrusions P1, Q1
As shown in FIG. 9, the concave portions P2 and Q2 that are tapered to each other are formed by a flat plate-shaped convex portion Q1 ′ having a tapered surface (flat surface) and a concave portion Q2 ′ that is fitted to the convex portion Q1 ′. It may be done. As a result, the strength of the convex portions P1 and Q1 can be increased.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a sectional view of a joint surface according to an embodiment of the present invention.

FIG. 2 is a sectional view of a joint surface after ultrasonic welding according to an embodiment of the present invention.

FIG. 3 is a perspective view of a case of the anti-theft device according to the embodiment of the present invention.

FIG. 4 is a sectional view of a joint surface according to another embodiment of the present invention.

FIG. 5 is a plan view of a top case according to another embodiment of the present invention.

FIG. 6 is a plan view of a bottom case according to another embodiment of the present invention.

FIG. 7 is a sectional view of a joint surface according to another embodiment of the present invention.

FIG. 8 is a sectional view of a joint surface according to another embodiment of the present invention.

FIG. 9 is a perspective view of a joint surface according to another embodiment of the present invention.

FIG. 10 is a sectional view for explaining a conventional ultrasonic welding method.

FIG. 11 is a sectional view illustrating a conventional ultrasonic welding method.

[Explanation of symbols]

 1 1st member 2 2nd member 10 Convex part 11 1st flat surface 12 1st inclined surface 13 3rd flat surface 21 2nd flat surface 22 2nd inclined surface 23 4th flat surface A, B joining surface

Claims (3)

[Claims] 1. An ultrasonic welding method for ultrasonically welding a joint surface (A) of a first member (1) and a joint surface (B) of a second member (2), wherein the first member (1) ), The first flat surface (1
1) and a first flat surface (11) that extends from the end of the first flat surface (11) toward the second member (2) side and is further away from the first flat surface (11) laterally toward the second member (2) side. 1 inclined surface (12) is formed, and the first flat surface (1) is formed on the joint surface of the second member (2).
1) and a second flat surface (21) joined to the first slanted surface (12) and a second slanted surface (22) joined to the first slanted surface (12), the first flat surface (11) or the second flat surface (11). A convex portion (10) is formed on any one of the flat surfaces (21) to form the first flat surface (11), the second flat surface (21), and the first inclined surface (12). The second inclined surface (22)
Ultrasonic welding method for ultrasonic welding. 2. The first member (1) and the second member (2) each have a bottomed tubular shape, and the end surfaces of the opening are the joint surfaces (A) and (B). The first flat surface (11), the first inclined surface (12), and the first inclination of the joint surface (A) of the first member (1) in order from the inside to the outside. A non-welding third flat surface (13) extending laterally outward from the outer end of the surface (12) is provided, and the joint surface (B) of the second member (2) is For non-welding, the second flat surface (21), the second inclined surface (22), and the lateral end outwardly extending from the outer end of the second inclined surface (22) in order toward the outside. A fourth flat surface (23), and the distance between the first flat surface (11) and the third flat surface (13) is equal to the second flat surface (21) and the fourth flat surface. (2
The ultrasonic welding method according to claim 1, wherein the ultrasonic welding is performed so that the distance is smaller than the distance from (3). 3. An intersection angle between the first flat surface (11) and the first inclined surface (13) is larger than an intersection angle between the second flat surface (21) and the second inclined surface (23). The ultrasonic welding method according to claim 1 or 2, wherein