RU2353519C1 - Ultrasound welding device - Google Patents

Abstract

FIELD: welding jobs.

SUBSTANCE: proposed device comprises the bed supporting two vertical posts fixed perpendicular to the bed. Ultrasound unit with waveguide is arranged between the posts, connected thereto to translate relative to them. A counter stop with its center connected to the bed by a metal rod is arranged opposite the waveguide working end. Note that the said counter stop is additionally connected to the bed by three adjustable-height supports that can be represented by stop screws set at equal distance from the center, the screw-to-screw distance being equal. Ultrasound unit can be translated by air-operated drive.

EFFECT: variable parameters and adjustments prior to starting welding, simpler design.

4 cl, 3 dwg

Description

The invention is intended for press welding of parts made of thermoplastic material, for pressing metal parts into parts made of polymer materials, for riveting polymer materials with other materials, as well as for stamping parts made of these materials.

To implement the welding process, it is necessary to have an ultrasonic transducer block with a waveguide and supports between which the elements to be welded are placed. (Volkov S.S. et al. Welding and bonding of plastics. - M.: "Mechanical Engineering", 1972, p. 60).

A device for ultrasonic welding or stamping of plastic parts is known (US Patent No. 5788791, IPC В29С 65/06, В29С 65/08), in which the bed is rigidly connected to the guide rack, to which the ultrasonic unit is connected with the waveguide with the possibility of movement along it. The workpiece is located in the holder mounted on the frame, opposite the working end of the waveguide.

A device for welding or stamping is known (US Patent No. 6309490 IPC В29С 65/00, В29С 65/08). As well as the above device, it contains a frame rigidly connected to the rack. But in this device, the workpiece is located on the counter, mounted opposite the working end of the waveguide, and is brought to it due to the fact that the counter is connected either to the pneumatic drive or to the hydraulic drive.

It should be noted that the surface to be machined can have a rather complex shape, and during press welding, the working surface of the waveguide must copy the shape of the surfaces of the parts to be welded.

A device is known (Patent RU No. 2260512) for ultrasonic welding of the bottom to a cylindrical workpiece. To implement the welding process, the cylindrical billet is fixed by the holder, and the end of the waveguide is made in the form of a ring, the diameter of which coincides with the diameter of the cylindrical billet. The bottom is laid on the workpiece, the ultrasonic unit is lowered and welding is performed.

A necessary condition for obtaining a high-quality seam is strict parallelism to the workpiece plane, to which the bottom and the plane of the ring tip of the waveguide are welded. If the parallelism of these objects is not observed, different amounts of ultrasonic energy are supplied to different parts of the parts to be welded, and there may be a large loss of ultrasonic energy due to its attenuation in air, since the reflection coefficient R at the interface with the air is ≥0.9, which almost leads to 100% reflection of the ultrasonic wave incident on the interface. As a result, an un welded portion of the bottom remains. Unparallelism can occur for various geometric reasons, in particular even the slightest deviation from the perpendicular position of the guide rack to the base can cause unparallelism.

The closest set of essential features to the proposed device is a device for ultrasonic welding, protected by US patent No. 5788791. It contains an ultrasonic unit with a waveguide, the working end of which is provided with a contour that repeats the shape of the weld, a bed, a holder for the part to be welded, a guide rack is rigidly fixed on the bed, on which the ultrasonic unit is fixed with the possibility of movement along it.

A disadvantage of the known device is the complexity of its manufacture. This is because in order to ensure the parallelism of the planes of the working end of the waveguide and the workpiece, a precise adjustment of all mechanical parts to each other is necessary.

The problem to which the invention is directed, is to ensure the parallelism of the planes of the working end of the waveguide and the workpiece while simplifying the manufacture of the device,

The problem is solved due to the fact that the proposed device for ultrasonic welding, as well as the known one, contains an ultrasonic unit with a waveguide, a bed on which at least one rack is rigidly fixed, on which an ultrasonic unit is mounted with the possibility of movement along it, and a holder for the workpiece. But, unlike the known one, in the proposed device, opposite to the working end of the ultrasonic waveguide, a counter-mount is installed on which a holder is located to accommodate the workpiece to be welded, the center of the counter-mount connected to the bed with a metal stand, and the counter-lock is connected to the bed by three additional ones located at equal distances from the center height-adjustable supports located at equal distances from each other.

Placing the workpiece on an additional stop, the center of which is rigidly connected with the stand to the bed and also connected to it using height-adjustable supports, allows you to change the location of the plane in which the stop surface is located, and thereby combine the planes of the part to be welded and the working tip of the waveguide . This makes it possible in the manufacture of the device not to achieve precision accuracy of the location of the parts relative to each other.

The combination of features formulated in paragraph 2 of the claims characterizes a device in which additional height-adjustable supports are located at the maximum possible distance from the center of the counter.

It is known that the larger the shoulder of the force, the greater the moment of force, i.e. the less force must be applied to change the position of the plane of the counter.

The combination of features formulated in paragraph 3 of the claims characterizes a device in which height-adjustable supports are made in the form of adjusting support screws.

Such a screw allows you to change the slope of the plane of the counter, but at the same time allows you to do without a hole in it.

The combination of features formulated in paragraph 4 of the claims characterizes the device in which the ultrasonic unit is connected to two guide racks and located between them.

Such a connection is more reliable.

The invention is illustrated by drawings, where:

figure 1 - an example of a device for welding with one guide rack;

figure 2 is an example embodiment of a device for welding with two guide racks;

figure 3 is an example of the holder.

Figure 1 shows an example of a device with manual adjustment of the movement of the ultrasonic unit relative to one rack, which is mounted on the frame 1.

A more detailed example of the implementation of the device (figure 2), in which the movement of the ultrasonic unit is carried out using a pneumatic actuator, and the ultrasonic unit is connected to two guide racks.

The device for ultrasonic welding (figure 2) contains a frame 1, on which are mounted racks 2 perpendicular to the frame. An ultrasonic unit 3 with a waveguide 4 is installed between the racks and connected to them. They are guides for the translational movement of the ultrasonic unit. Opposite the working end of the waveguide 4, a counter-mount 5 is installed, the center of which is connected to the bed by a metal stand 6. Additionally, the counter-mount 5 is connected to the bed by three height-adjustable supports 7. In the example, the supports 7 are made in the form of adjusting support screws that are screwed into the frame, and the lower part the counterpart can rest on their heads.

The screws are installed at the same distance from the center (figure 3), and the distances between adjacent screws are equal. When one screw is unscrewed from the bed 1, the stand 6 is slightly bent and the plane of the arrangement of the counter-element is shifted by some angle. By changing the height of the other screw, we change the direction of inclination. That is, by combining the heights of the screws, it is possible to achieve parallelism of the planes of the workpiece surface of the workpiece and the working end of the waveguide with their initial non-parallelism. And this makes it possible to change the tolerances used in the manufacture of the device, in the direction of their increase and thereby simplify its manufacture.

A holder 8 is mounted on the counterpart for the workpiece 9. The ultrasonic unit 3 is mounted on racks with the possibility of its movement. The movement can be implemented using a pneumatic actuator, made in the form of a rod 10, acting on the frame 11, connected to the pneumatic cylinder 12.

The location of the planes of the working end of the waveguide and the workpiece can be determined by instrumental means, or by the quality of the seam. For example, in the manufacture of a direct current micro-rotor, a counterter was used, the diameter of which is 82 mm, the height of the stand and its diameter are 44 and 12 mm, respectively. In the manufacture, it is necessary to put the bearing on the plastic sleeve 13 with several protrusions and fix its position on it by melting the end of the sleeve, the diameter of which is 6 mm. For this, the sleeve 13 is installed in the hole of the holder 8, a bearing is put on, which is fixed on the sleeve by a protrusion, and the working end of the waveguide, which has a shape that repeats the shape of the end of the sleeve after processing, is brought. The end of the sleeve is fused. In the case when, after processing, the finished product remains in a shape that completely repeats the shape of the working end of the waveguide, and the bearing is fixed on the sleeve without the possibility of moving along it, it can be argued that the counter is configured with screws correctly. If the result is negative, it should be reconfigured.

Thus, we can conclude that the proposed design includes the ability to change the parameters of the device, its settings before starting work, and this makes it possible to reduce the requirements for the accuracy of its manufacture and, therefore, simplify the manufacture.

Claims (4)

1. Device for ultrasonic welding, comprising an ultrasonic unit with a waveguide, a bed on which at least one rack is rigidly fixed, on which an ultrasonic unit is mounted with the possibility of movement along it, and a holder for the workpiece, characterized in that opposite to the working end of the ultrasonic waveguide a counter is installed, on which is a holder for placing the workpiece to be welded, the center of the counter being connected to the bed with a metal stand, and the counter is connected to the bed three additional, located at equal distances from the center, height-adjustable supports located at equal distances from each other. 2. The device for ultrasonic welding according to claim 1, characterized in that the additional height-adjustable supports are located at the maximum possible distance from the center of the counter. 3. The device for ultrasonic welding according to claim 1, characterized in that the height-adjustable supports are made in the form of adjusting support screws. 4. The device for ultrasonic welding according to claim 1, characterized in that the ultrasonic unit is connected to two guide racks and is located between them.

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