JP3167927B2 - Ultrasonic welding equipment and 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 ultrasonic welding, and more particularly, to an object to be welded on a side to which a welding head comes into contact has a plurality of branch portions, and each of the plurality of branch portions has a welding point. The present invention relates to an improvement in a welding device and a welding method for simultaneous welding of set items.

[0002]

2. Description of the Related Art In a case where a plurality of welding points are collectively welded to a workpiece to which a plurality of welding points are set in consideration of work efficiency, a general resistance welding spot welding is used. in accordance with the plurality of welding points, as shown in FIG. 4, a plurality of projections 52, ... it is to create electrodes 51 shaped like projects even if the welding, subtle weldment thickness, Due to the difference in the surface state, a difference occurs in the resistance between the projections 52, and the connection characteristics between the welding points 54, for example, the joint strength tend to vary. In the drawings, 53 and 53 indicate a workpiece, 55 indicates a primary winding of an AC power supply, and 56 indicates a secondary winding.

On the other hand, in ultrasonic welding, two workpieces are sandwiched between a welding head (welding tip) attached to the tip of a horn and a welding table and pressurized to give vibration energy to the welding head for a short time. Vibrates in the horizontal direction, thereby destroying the coating on the contact surface of the two workpieces and performing recrystallization welding by local vibration heating.
As shown in FIG. 5 , the welding head H is connected to a plurality of ridges 6.
Even if the shape in which 0,... Are arranged, vibrations having substantially the same magnitude as the vibration source are equally transmitted to the respective welding locations of the workpiece 61, and the vibrations for satisfying the predetermined welding strength at the respective welding locations. Energy is excited, and simultaneous simultaneous welding becomes possible. In FIG. 5 , reference numeral 66 denotes another welded object, and 68 denotes a welding table.

[0004]

However [0007], even if to do by ultrasonic welding simultaneously collectively welding the plurality of portions, the welded object 61, as shown in FIG. 5, a plurality of branch portions 62,
.., And when the welding point is set on the branch portion, and when the branch portion 62 has a simple shape having symmetry such that the shapes of the branch portions are equal to each other, the ultrasonic waves are uniformly applied to each weld portion. Energy is transmitted, and relatively stable connection characteristics can be obtained. For example, as shown in FIG. 6, when the plurality of branch portions 72 of the workpiece 71 have different shapes, When simultaneous simultaneous welding is performed, the connection strength varies, and stable connection characteristics may not be obtained.

[0005] This is because, due to the different shapes of the branch portions 72 where the welding points are set, there are variations in the ultrasonic energy conditions related to the welding function, such as the transmission energy of the ultrasonic waves and the energy consumption between the welding points. It is thought to be caused.

Accordingly, in the present invention, a welding point is set at a portion branched from a base having a predetermined shape into a plurality of portions, and each branch portion including the welding point has a different shape, for example, an object to be welded. In the case of simultaneously welding the welded portions of the bus bars and the like as shown in FIG. 6 by ultrasonic welding at a time, a stable and strong connection characteristic without variation between the welding points can be obtained. It is to make.

[0007]

In order to solve the above-mentioned problems, the present invention provides one of the objects to be welded having a base having a predetermined shape and a plurality of branch portions branching therefrom. The predetermined position of the part is a welding point, and the other workpiece is placed on the branch portion in a form of connecting the plurality of welding points,
In an ultrasonic welding device that sandwiches both workpieces between the welding table and the welding head on the welding point and presses with the welding head to weld a plurality of welding points at once, pressurization by the welding head during welding Separately, it presses against a welding table at a predetermined position on the surface of the branch portion of the one workpiece, and the pressing position is
The welding device is provided with a pressing means positioned so that the volumes of the welding head contact sides partitioned at the position are equal to each other (claim 1).

With this configuration, no ultrasonic wave is transmitted from the fixed position of the workpiece to the side where the welding head does not exist, so that no vibration occurs. Further, the sides where the welding heads are separated by the pressing means have the same volume, so that the ultrasonic vibration energy transmitted to this portion becomes equal to each other.

According to the present invention, in order to solve the above-mentioned problems, one of the objects to be welded has a base having a predetermined shape and a plurality of branch portions branching therefrom. With the position as the welding point, the other workpiece is placed on the branch in such a way as to connect these multiple welding points, and both workpieces are sandwiched between the welding table and the welding head on the welding point, and welding is performed. As an ultrasonic welding method in which a plurality of welding points are collectively welded by pressing with a head, at the time of welding, apart from pressurization by a welding head, the one workpiece is placed at a predetermined position on the surface of the branch portion. The pressing means is pressed against the welding table, and the pressing position is set so that the volumes of the welding head contact sides partitioned at the position are equal to each other (claim 2).

A bus bar can be used as the one of the workpieces.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

(First Embodiment) In this embodiment, an object to be welded is a brass bus bar and a stranded wire of annealed copper, and the bus bar has a base 1 in the form of a longitudinal band as shown in FIG. ), A plurality of strips (in this embodiment, ten strips are shown, but the number is arbitrary).
.. Are used.

Each of the belts 2 has a different planar shape at an intermediate portion from the branching position to the tip 3, but the tips 3 are aligned in a fixed direction, and the belts 2 are positioned from the tip 3 to the base 1 side by a certain distance. They have the same width and their longitudinal directions are parallel.

On the other hand, the stranded electric wire is composed of seven single wires having a diameter of 0.36 mm, which are stranded, and having a total sectional area of 0.5 mm ^2.
Was used.

The welding point 4 is set on the bus bar 10 in the vicinity of the tip 3 of each of the branched strips 2. In this embodiment, as described above, since the number of branches is 10, the number of welding points 4 for simultaneous batch welding is 10.

According to the present invention, as described above,
The work to be welded is pressed and fixed by using a pressing jig separately from the pressing by the welding head, and the pressing position 5 is set at each welding head contact side (the side where the welding point 4 exists) partitioned at the position. The busbar 10 is a plate having the same thickness, so that equalizing the volume means, in the end, equalizing the surface area of the portion.

The bus bar 10 of this embodiment is
As described above, the tips 3 of the strips 2 are aligned in a certain direction, and the strips have the same width from the tip 3 to a position returning to the base 1 side by a certain distance, and the longitudinal directions are arranged in parallel. In order to make the surface area of the area including the welding point 4 equal,
The pressing position 5 is provided at a position equidistant from the leading end 3 of each strip 2 to the base 1 side. By doing so, the pressing position 5
From the surface to the tip 3 of the strip 2 are equal,
Therefore, the volume is also equal between each of the strips 2.

As a pressing jig connecting such positions,
Using a long plate 6 as shown in FIG.
Was pressed at once with this plate 6, and both ends of the plate 6 were fixed to a welding table 8 with bolts 7.

As the welding head, a comb-shaped collective simultaneous welding head as shown in FIG. 5 of the conventional example is used, and each of the comb-shaped ridges presses the welding point 4, but in FIG. This welding head is not shown for simplicity.

Further, the stranded electric wire is placed on the bus bar 10 and brought into contact with the welding head, but this stranded electric wire is not shown in order to avoid the complexity of illustration.

In this way, 50 samples were prepared for each of the cases where the above jig was used and when it was not used, and the connection strength of each welding point 4 was measured for each sample. Table 1 shows the average value and standard deviation of the results.

[0022]

[Table 1]

As is clear from Table 1, when the bus bar 10 is fixed by the jig 6, a strong connection result without variation between the welding points 4 can be obtained.

This is because, as described above, when the workpiece 10 is pressed and fixed, the ultrasonic wave is not transmitted from the pressing position 5 to the side where the welding head does not exist, and the pressing fixture fixed by the jig 6 is used. It is considered that since the volume from the position 5 to the end 3 via the welding point 4 is equal to each other, the vibration energies of the ultrasonic waves transmitted to this portion are equal to each other.

(Second Embodiment) In the second embodiment,
A brass bus bar having the same shape as that of the first embodiment and a stranded wire of soft copper were used as the objects to be welded, and only the fixing jig was changed to a comb-shaped one as shown in FIG.

As shown in FIG. 3, the fixing jig 26 is pressed by the respective comb-like projections 27 on the respective bus-shaped strips 2 at the pressing positions 5.
Are individually pressed.

Also in this case, 50 samples were prepared, and the connection strength at each welding point of each welding object was measured. Table 2 shows the average value and standard deviation of the results together with the results of the first embodiment.

[0028]

[Table 2]

As is clear from Table 2, the jig 26 was moved to the position shown in FIG.
It can be seen that a stronger connection result with no variation between the welding points 4 can be obtained by setting as follows.

This is because each adjacent ridge 2 of the pressing jig 26
In the ultrasonic welding in which vibration is transmitted in the horizontal direction since the space 28 is present between the ridges 7, the ultrasonic wave is not transmitted between the adjacent ridges 27 due to the space 28, and serves to prevent the leakage of vibration. It is thought that there is.

REFERENCE EXAMPLE As a reference example, the work to be welded on the side fixed by the pressing jig has six strips vertically branched from the base of the long strip.
The three rows from the left have a width and a protrusion from the base
The amount is equal to each other, and the remaining three rows also have their width and base
Their protrusion amounts are equal to each other, but from the first three rows,
Thick plate-shaped objects whose protrusion amount and width are small
I will.

[0032]

If the workpiece has such a shape , 6
One of the band-shaped, to volume, thus such that its surface area is equal to each other <br/> physician positions of existing side welding point partitioned by pressing position location (welding head abutting side), the first three columns and the remaining three rows, the width of the band-shaped also varies the position of the previous end, not line up on a straight line pressing position location is unlike the case of the welding of the embodiment, the first 3 The pressing position is different between the row set and the remaining three row sets.

[0034] Therefore, the jig for holding such a pressing position location
Ingredients has a plane shape, something like a key type for diverting at positions transitory from the set of the uppermost first three columns in the remaining three rows of pairs.

[0035]

As described above, according to the present invention, when one of the objects to be welded has a plurality of branches and a welding point is defined on each branch, those objects are replaced with the other object to be welded. And simultaneous simultaneous welding, it is possible to obtain stable and strong connection characteristics without variation between the welding points.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an object to be welded applied in an embodiment.

FIG. 2A is a perspective view and FIG. 2B is a front view of the first embodiment.

FIG. 3 is a front view showing a second embodiment.

FIG. 4 is a schematic view showing resistance welding.

FIG. 5 is a perspective view showing a conventional example.

FIG. 6 is a perspective view showing an object to be welded;

[Explanation of symbols]

 Reference Signs List 1 base 2 strip 3 tip 4 welding point 5 pressing position 6 plate (jig) 10 busbar

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-9-232013 (JP, A) JP-A-7-505836 (JP, A) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B23K 20/10 H01R 4/02 H01R 43/02

Claims (3)

(57) [Claims] 1. One of the objects to be welded has a base having a predetermined shape and a plurality of branch portions branched from the base, and a predetermined position of each branch portion is set as a welding point. The other workpiece is placed on the branch portion in a continuous manner, the two workpieces are sandwiched between the welding table and the welding head on the welding point, and pressed by the welding head to collectively weld a plurality of welding points. In an ultrasonic welding apparatus for welding by welding, apart from pressurization by a welding head during welding, a pressure is applied to a predetermined position on a surface of a branch portion of the one workpiece with a welding table, and the pressing position is An ultrasonic welding device comprising a pressing means positioned so that the volumes of the welding head contact sides partitioned at the position are equal to each other. 2. One of the objects to be welded has a base part having a predetermined shape and a plurality of branch parts branched from the base part. A predetermined position of each branch part is defined as a welding point, and these plurality of welding points are defined. The other workpiece is placed on the branch portion in a continuous manner, the two workpieces are sandwiched between the welding table and the welding head on the welding point, and pressed by the welding head to collectively weld a plurality of welding points. In the ultrasonic welding method, the one of the objects to be welded is pressed against a welding table by a pressing means at a predetermined position on the surface of the branch portion, separately from pressing by a welding head during welding. The ultrasonic welding method is characterized in that the position is set so that the volumes of the welding head contact sides partitioned at the position are equal to each other. 3. The ultrasonic welding method according to claim 2, wherein a bus bar is applied as said one workpiece.