JPH09248857A - Ultrasonic welding receiving stand - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform accurate ultrasonic welding work by bringing the bottom surface of an upper receiving stand and the upper surface of a lower receiving stand to a curved surface contact state in a shakable manner. SOLUTION: Ultrasonic waves generated by a ultrasonic transmitter and having exciting force of about 5000 N are transmitted to a horn made of a metal block. The horn is moved up and down and the lower part of the horn and the divided articles to be welded on the receiving stand fixed to a stand are brought into contact with each other in parallel to perform ultrasonic welding. The receiving stand consists of an upper receiving stand 11, a lower receiving stand 12 and the ball 13 of which the material quality is high carbon chromium bearing steel interposed between them. The receiving stands 11, 12 have grooves in which a spherical substance is fitted. Further, the upper receiving stand 11 is connected to the lower receiving stand 12 by using a guide plate 14 so as not to be rotated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base for an object to be welded, which is mainly used for integrally welding the objects to be welded divided by using ultrasonic waves.

[0002]

2. Description of the Related Art A conventional ultrasonic welding pedestal is made of an integral body as shown in FIG. 2, on which an object to be welded is fixed, and a lower surface of a horn for transmitting ultrasonic waves to the object to be welded is brought into contact with the object. The divided objects to be welded are welded.

[0003]

As a method of adhering the divided parts, a method of using an adhesive or a solvent, a method of welding by means of dielectric, ultrasonic waves, etc. are used. However, like plastics, they are welded by heating. The ultrasonic welding method is generally used for parts that can be manufactured. However, when ultrasonic welding is used to weld a component such as a container that is particularly required to have airtightness and liquid-tightness, some leakage is not allowed and accuracy is required. In the conventional ultrasonic welding cradle, when repeated work is performed, the positional relationship between the object to be welded and the horn that transmits the ultrasonic waves is slightly deviated due to the vibration of the ultrasonic waves, and the welding state deteriorates. The position and angle of the table must be corrected before restarting, or the pedestal must be changed when the size of the material to be welded changes, so the positional relationship must be adjusted each time. There was a problem such as. The present invention solves the above-mentioned problems, and the present invention is capable of performing accurate ultrasonic welding repeatedly and with accurate alignment by simple adjustment even when the shape of the object to be welded is changed. An object is to provide an ultrasonic welding cradle having a function.

[0004]

DISCLOSURE OF THE INVENTION The inventors of the present invention divide a horn into an upper portion and a lower portion, and the upper portion and the lower portion are combined with a concavo-convex screen. The object to be welded can always be brought into contact with the correct positional relationship, and the pedestal can be tilted in response to the delicate inclination of the object to be welded, thereby succeeding in accurate ultrasonic welding work. That is, the gist of the present invention is a pedestal for placing an object to be welded in an ultrasonic welding machine, the pedestal being divided into an upper pedestal and a lower pedestal, and a bottom surface and a lower pedestal of the upper pedestal. Is an ultrasonic welding cradle characterized in that its upper surface is in rockable contact with the curved surface.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is a pedestal for placing a material to be welded, the pedestal being divided into an upper pedestal and a lower pedestal, and the upper pedestal and the lower pedestal being curved surfaces. It is an ultrasonic welding cradle that is in rockable contact. In the case of the present invention, in order to swingably contact the upper pedestal and the lower pedestal as described above, the lower surface of the upper pedestal and the upper surface of the lower pedestal are combined with an uneven curved surface, and the curvature of each curved surface is If they are different, the curvature on the concave side needs to be gentler than the curvature on the convex side. The pedestal may be one in which the upper pedestal 11 and the lower pedestal 12 themselves have curved surfaces, as schematically shown in FIGS. 5, 6 and 7, and schematically in FIGS. 8 and 9. As shown, a member 13 having a curved surface may be inserted between the upper pedestal and the lower pedestal so that the upper pedestal 11 and the lower pedestal 12 are assembled by the uneven curved surface. At this time, it is preferable that the portion corresponding to the apex of the curved surface is near the center of gravity of the upper pedestal, but the present invention is not limited to this. Explaining the dimensional relationship with an example where the curved surface is hemispherical, as shown in FIGS. 10 and 11, the size of the concave portion (radius: R1) is the size of the convex portion (spherical object) (radius: radius: R1). It is preferably equal to or slightly larger than R2). Further, the depth (D) of the groove is the radius (R
If it is smaller than 2), a gap (T) is formed between the upper and lower pedestals, which is preferable. The value of the gap (T) and the size of the pedestal determine the maximum inclination dimension (H) of the object to be welded, but when the size of the pedestal is about 100 mm square, the gap (T) is 0.0.
It is preferably 5 to 3.0 mm, more preferably 0.1 to 1.0 mm, and most preferably 0.4 to 0.6 mm. However, if the size and shape of the upper pedestal changes according to the shape of the object to be welded and it is necessary to change the maximum inclination dimension (H) before welding, make a large gap (T) and fix it to the lower pedestal 12. The maximum inclination dimension (H) is adjusted by changing the clearance (T) between the guide 14 and the upper pedestal 11. Further, the guide 14 plays a role of preventing the upper pedestal from being rotated by the vibration of the ultrasonic waves and being rotated or laterally displaced. A pin may be used instead of the guide (FIGS. 12 and 13). The spherical object mentioned here does not have to be a pearl, and may have an elliptical or egg-shaped cross section as long as it has a smooth curved surface. Any material may be used as long as it has hardness, tensile stress, and bending stress that can withstand ultrasonic vibration used for ordinary welding.
It is preferable that the materials of the upper pedestal and the lower pedestal themselves are similar to or stronger than the material of the spherical substance.

[0006]

Embodiments will be described with reference to the drawings.
FIG. 1 shows the whole of an ultrasonic welding machine equipped with a pedestal 1 of the present invention. The excitation force generated by the ultrasonic transmitter 6 is about 5,000
The 0 N ultrasonic wave is transmitted to the horn 3 made of a metal block. The horn 3 is moved up and down, the lower part of the horn and the divided object 2 to be welded on the pedestal 1 fixed to the pedestal 4 are brought into parallel contact with each other to perform ultrasonic welding. The embodiment shown in FIG. 3 shows only the pedestal of the present invention. The upper pedestal 11, the lower pedestal 12 and the balls 13 (R2: 6.0 mm) made of high carbon chrome bearing steel are interposed therebetween. Consists of. Cradle 11,
The groove 12 into which the spherical substance is fitted (R1: 6.01 mm,
D: 5.75 mm). Further, a guide plate 14 is used to connect the lower pedestal 12 so that the upper pedestal 11 does not rotate. FIG. 4 shows a pedestal provided with a rotation prevention pin 21 instead of the guide plate of FIG. Lower cradle 12 and upper cradle 1
There is a gap (T: 0.5 mm) between the upper support and the lower support with the rotation prevention pin 21.

[0007]

The present invention is carried out in the form described above, and has the following effects. With the pedestal that keeps the horn transmitting the ultrasonic wave and the welded object in a correct positional relationship at all times, the pedestal can be tilted in response to a slight inclination of the welded object to perform accurate ultrasonic welding work. Therefore, even in the case of containers for parts that require airtightness and liquid-tightness, the yield was 9 to 94% compared to the conventional yield of 9%.
You can raise from 8 to 99%. In addition, a versatile ultrasonic welding pedestal can be obtained by a simple operation such as exchanging the upper pedestal according to the shape of the object to be welded, and it took 30 to 60 minutes when changing the conventional brand. The cradle adjustment time can be reduced to about 1 minute.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an entire ultrasonic welding machine including a pedestal 1.

FIG. 2 is a vertical cross-sectional view showing a conventional pedestal.

FIG. 3 is a view showing an example of a pedestal of the present invention.

FIG. 4 is a view showing another example of the cradle of the present invention.

FIG. 5 is a schematic view showing an example of the cradle of the present invention.

FIG. 6 is a schematic view showing another example of the cradle of the present invention.

FIG. 7 is a schematic view showing another example of the cradle of the present invention.

FIG. 8 is a schematic view showing another example of the cradle of the present invention.

FIG. 9 is a schematic view showing another example of the cradle of the present invention.

FIG. 10 is a schematic view showing an example of the pedestal of the present invention.

FIG. 11 is a schematic view showing an example of the cradle of the present invention.

FIG. 12 is an explanatory view showing an example of the pedestal of the present invention.

FIG. 13 is an explanatory view showing an example of the pedestal of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cradle 2 Divided welded material 3 Horn 4, 5 Frame 6 Ultrasonic transmitter 11 Upper cradle 12 Lower cradle 13 Ball 14 Guide plate 15 Lower cradle set bolt 21 Anti-rotation pin

Claims (2)

[Claims] 1. A pedestal for placing an object to be welded of an ultrasonic welding machine, the pedestal being divided into an upper pedestal and a lower pedestal, and a bottom surface of the upper pedestal and an upper surface of the lower pedestal. However, an ultrasonic welding cradle characterized in that it is in rockable contact with a curved surface. 2. The ultrasonic welding pedestal according to claim 1, further comprising a rotation preventing guide for the upper pedestal and the lower pedestal.