JPH01249281A - Ultrasonic welder and ultrasonic welding nose section used for said device and ultrasonic welding method - Google Patents

Abstract

PURPOSE: To efficiently weld by constructing an ultrasonic welding part, an adjustable fixing part and a work tip part bundling block and mutually adjusting respective position to bundle work tip parts having different diameters. CONSTITUTION: A turnable welding tip part 20, a fixing part adjustable to a base table 14 and a bundling block 34 facing and adjustable to a support face bundling work tip parts with these both are constituted, these parts are mutually adjustable. At beginning, bundles of work tip parts 32 are inserted to a gear shaped work faces 28, 22 and part of a grip zone 35, after the work tip parts 32 having different sizes are completely gripped by an end face 37 of the bundling block 34, the bundle is welded by an ultrasonic horn 18. By this method, the work tip parts 32 having different diameters are bundled, thus, effective welding is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ultrasonic welding device, an ultrasonic welding tip used in the device, and an ultrasonic welding method. The ultrasonic welding device and method uses an adjustable welding tip to weld wires of different diameters while tightly focusing around the wire during welding to avoid spreading or expanding the medium-sized wire during the welding process. Have the necessary means. The welding tip can be rotated once and has several alternative work surfaces available in conventional machining, thereby increasing the durability of the layer and reducing manufacturing costs.

(Conventional technology) FIG. 1 shows a conventional ultrasonic welding device.

In the figure, the ends of the electrical wires 7, which overlap each other, are inserted into a closed groove l formed between an ultrasonic welding tip 3 and a fixed support 5 (for example, as shown in FIG. 1). The electric wires are welded to each other by ultrasonic vibration by applying ultrasonic energy to the tip 3. The ultrasonic energy should be applied such that the welding tip 3 vibrates in proportion to the longitudinal axis of the wire being welded to bond the molecules of the wire ends together.

In order to ensure that the vibrational energy is efficiently transferred to the wire or workpiece, the ultrasonic welding tip and fixed support have a gear-like workpiece surface 9 that holds the workpiece securely in place.

Conventionally, methods for generating ultrasonic vibrations are described in, for example, US Pat. No. 1, 05], 124. :1. :128.610
．． The normal vibration frequency disclosed in Ko, 444,612° and 1,502,421 is 2,000 vibrations per second.
It's a cycle.

During the welding process, the wires should be tightly focused within the compression chamber to prevent spreading or expansion of the wires. Additionally, changing the number or size of these wires requires adjusting the cross-sectional area of the compression chamber. It is desirable that such adjustments be made without replacing the equipment, and it is also desirable to form multiple gear-like surfaces for rapid replacement of worn-out gear-like surfaces. It should be realized with a device of simple shape.

Focusing on the following points, the conventional device shown in FIG. 1 has several disadvantages. First, the wires to be welded are
It is held in a groove formed by joining the notch 4 of the ultrasonic welding tip 3 and the notch 2 of the fixed support base 5. The joined cuts 2 and 4 are non-adjustable, and due to the engagement of the wire 7 and the gear-like workpiece surface 9, the tolerance range of the tip 3 and fixed support 5 is such that the wire end remains in a plastic state during welding. A given ultrasonic welding tip is important to prevent extrusion expansion of the wire end while keeping the
It can only be applied to a single size wire or a limited number of wire ends; therefore, fabrication shops that need to weld wires of various sizes should use ultrasonic welding tips with correspondingly sized cuts. Must be prepared.

Second, the ultrasonic welding tip and fixed support have complicated shapes, and each cut must be made with exact precision, which naturally increases manufacturing costs.

Finally, as shown in FIG. 1, the welding tip 3 presents two gear-like work surfaces 9. The first workpiece surface 9 wears out and the dimensional accuracy of the jagged gripping part and the gear part decreases after use due to deformation. Next, when the welding tip is rotated 180 degrees, the second A gear-like work surface appears. This second
If the work surface of the tip also wears out, the tip must be discarded.

As mentioned above, the manufacturing cost of this welding tip is high;
Tips with variable cut sizes can only be procured from factories that stock a large number of replacement parts. Therefore, frequent disposal of such welding tips results in increased costs and inconvenience in procurement.

The apparatus for connecting conductors described in US Pat. No. 4,646,957 (N uss) is related to this invention.

Generally speaking, this patent applies to electric wire strands.
This article describes an ultrasonic welding device for electric wires with an oscillator (5 o
a nottrode) and a support with movable side walls for compressing the wire strand against the head of the oscillator.

This support part has two movable parts, namely, a surface that moves back and forth parallel to the fixed oscillator surface and a surface that moves up and down perpendicular to the fixed surface. With adjustable rectangular cross-section space for electrical wires.

The gap between the movable support and the fixed surface of the oscillator is precisely controlled.

One of the differences between this invention and the Nuss patent mentioned above is that
The welding tip of the present invention is movable while the support remains in a fixed position. In contrast, the oscillator of the Nuss patent is stationary and the support is movable. This is because the movable support part is an ultrasonic welding horn (ultrasonic vibration generating part)
This is an important difference because the two components vibrate together. in this case,
Welding becomes less effective. However, when the support is locked in place as in the present invention, only the ultrasonic horn vibrates and uniform and effective welding can be achieved with each operating cycle.

[Structure of the invention]

The ultrasonic welding device according to the invention includes a movable focusing block between a fixed part, a support part and a welding tip for welding wires (workpieces) of different sizes and numbers. The welded tip is wear-resistant and has a simple cross-sectional shape, making it easy to manufacture. This tip has several work surfaces at its corners that can be rotated as needed.

The cross section of the welding tip is preferably square, and may be a convex polygon or rectangle.In the case of a regular polygon, each side is equal, so it refers to a square, for example.A welding tip with such a cross section is Rotates around the axis and shows different work surfaces without changing the axis position.

As mentioned above, this ultrasonic welding device consists of three main components: an ultrasonic welding tip, an adjustable fixing section that is necessary for wire welding to occur, and a wire transfer between the fixing section and the welding tip. It consists of an adjustable focusing block opposite the support surface for focusing the ends. The fixing part is adjustable to change the gear-like work surface in contact with the bundle of wires to be welded. The cross sections of these main components are rectangular. These components are assembled at 90 degrees, but the corners of adjacent components do not touch each other. This configuration consists of 4
A groove-shaped work area consisting of two work surfaces is formed, each work surface being a single side of the surrounding work area.

In order to achieve efficient transmission of ultrasonic energy to the wire workpiece, the workpiece surfaces of the tip and fixing parts each have a gear-like shape. The position of the focusing block relative to the support is adjustable, so that the diameter of the workpiece surface can be varied according to the diameter or number of wires to be welded. The gear-like work surfaces of the fixed part and tip part are also adjustable.

Thus, while the wire remains plastic during welding, ensuring that the wire end or workpiece is focused within the work area to prevent expansion or extrusion is accomplished by adjusting the focusing block and support. It will be done.

On the other hand, the rotation of the tip and the adjustment of the opposing work surface relative to the tip of the fixed part reduce wear, thereby increasing the durability of the gear-like work surface.

The focusing block and the tip can be freely rotated from the workpiece position t, i'I! Facilitate wire insertion and removal. During the process of reducing the size of the work area, the focusing block is first moved towards the support to partially compress the work piece. At this time, the focusing block and tip are
At the same time, it moves towards the fixed part to hold and compress the workpiece. Immediately after the welding is completed, the focusing block is first separated from the support. The focusing block and tip also separate from the fixed part. When the workpiece groove is opened, the welded workpiece is removed and an unwelded workpiece is inserted.

Prior art welding methods involve ultrasonically vibrating the tip parallel to the longitudinal axis of the workpiece. During ultrasonic welding, the tip will wear out and the gear-like workpiece surface will become flat and lose its grip on the wire, making it impossible to transmit ultrasonic energy. Therefore, the workpiece surface at the tip will often need to be replaced.

〔Example〕

The present invention will be described in detail based on the accompanying drawings.

The device IO according to the invention comprises a support 12 provided on a main support base 14 . The position of the support part 12 can be changed laterally by rotating a screw 16 rotatably fixed to the upper end of the base 14 and connected to a screw hole (not shown) in the support part 12. adjusted. The support 12 moves until it contacts the side of a tip 20 connected to an ultrasonic welding horn. The tip 20 has a square cross section and has one gear-like work surface 22 and three auxiliary gear-like work surfaces 24 at the corners. An anvil 26 with a gear-like work surface 28 is provided above the support 12 . The fixing portion 26 is adjusted by rotating an adjusting screw 30 provided with a scale 31 in order to confirm its adjusted position with respect to the base 14. The im screw 30 extends through the upright portion 33 on the base 14 and into the tapped hole of the fixing portion 26 .
is rotated until the gear-like work surface 28 of is in position and facing and parallel to the work surface 22 of the tip 20. The tip 20 can be disposed opposite the gear-like work surface 28 shown in FIG.

The bundle of wire ends 32 to be welded is placed between the gear-like work surfaces 28 and 2.
A focusing block 3 is inserted into a partially enclosed work area 35 surrounded by a side end surface 37 of the supporting part 12 and a focusing block 3 for changing the partially enclosed work viewing area 35 into a closed work area 36.
It is completely surrounded by the end face 37 of 4. The focusing block 34 is pivotally mounted to one end of a crank arm 38 which is rotatably mounted to a pivot bin 40 of the base 14. The other end of the crank arm 38 is pivotally attached to a piston head 42 which is slidable within a circular groove 44 of the base 14.

The work position of the focusing block 34 is the piston head 42
It is adjusted by the rotation of a stud 46 formed through the side wall of the base 14 that supports the. Clockwise rotation of the screw 46 causes the piston rad 42 to move laterally within the cylindrical groove 44 . That is, crank arm 38 or pivot pin 40
rotation in a counterclockwise direction about , causing hydraulic pressure reduction in shaft 47 and spacing focusing block 34 from the end of the fixed portion at the top of tip 20 . On the other hand, counterclockwise rotation of the screw 46 forces the piston shaft 47 and the piston head 42 to return to their original positions, thereby moving the focusing block 34 toward the end of the fixed portion 26.

Tip part 20. Support part 12. Adjusting the respective positions of the fixing portion 26 and the focusing block 34 is important in changing the size of the work area 36. Thereby, one or more wire ends 32 can be tightly focused within the work area 36 to prevent spreading and plastic extrusion of the wire during welding. Furthermore, the resizing of the work area 36 can be done without replacing it with other substitutes, reducing cost and complexity.

Once the wire end 32 is inserted and securely focused into the work area 36 by the focusing block 34, the welding of the wire end 32 is carried out in a direction parallel to the longitudinal axis of the wire end 32 at a frequency of 20 to 40 KHz. Ultrasonic horn 18 that vibrates 20
This is done by

Due to repeated ultrasonic welding, the gear-like workpiece surface 22 of the tip 20 will wear out, that is, the gear-like workpiece surface 22 of the tip 20 will become flat, and due to damage to the gripping part on the object to be welded. Transmission of ultrasonic energy becomes impossible. Naturally, the effect of ultrasonic vibration is lost.

As the gear-like work surface 22 of the tip 20 wears out, the tip 20 is rotated 90 degrees around the ultrasonic end 18 and the tip 2
One of the auxiliary gear-like work surfaces 24 of No. 0 is disposed at a position facing the gear-like work surface 28 of the fixed part 26. These auxiliary gear-like work surfaces 24 are identical to the gear-like work surface 22 of the tip 20, thereby extending the life of the tip 20. The length of the gear-like work surface 28 of the fixture 26 introduced into the work area 36 can be adjusted by rotation of the screw 30 for durability if the entire gripping surface is not required.

One important feature of this invention is that the tip 20° support portion 1
2. This means that the relative positions of the fixing part 26 and the focusing block 34 can be adjusted. As shown in FIG. 4, the work area, which is the size-adjustable groove 36, is fully open.

At this stage, the bundle of wire ends 32' is inserted into the work area 35 bounded by the second and third work surfaces 22 and 28. Respective work surfaces 22 and 28 form gear-like work surfaces adjacent to focusing block 34 and second and fourth work surfaces 37 and 39 of support 12 .

Next, FIG. 5 will be explained. The focusing block 34 is
The second work surface 37 moves toward the fixed part 26 so as to contact the surface 50 of the fixed part 26 . The second work surface 37 is desirably capable of contacting the surface 50 or is friction free when the focusing block 34 moves parallel to the surface 50, thus approximately 0.001 to 0.002
A small gap of 1 inch is required. The size of the gap between the above components is adjusted by the wire end 32'40 fineness. For example, if the wire end is very fine, it is important to provide a small gap so that the wire end There is no chance of getting caught between components.

In the next operating step, shown in FIG.
The size of the groove 36 is reduced by compressing the wire end 32'. At this time, ultrasonic energy is applied and the wire ends are welded.

Following welding of wire ends 32', focusing block 34 is spaced from surface 50 of fixture 26, shown in FIG. At this time, focusing block 34 and tip 20 return to their original positions as shown in FIG. Focusing block 34 is preferably spaced from fixture 26 to avoid friction with one surface 50.

Furthermore, by increasing the size of the groove portion 36, there is less friction between the welded electric wire 32° and the fourth work surface of the support portion 12. It is believed that the focusing block 34 moves faster than the tip 20 and thus moves before the tip 20. However, in the present invention, the tip 20 begins to separate from the fixation part at the same time as it separates from the focusing block 34 or the fixation part 26. However, the speed of movement of the focusing block will release the groove 36 before the tip has a chance to move a significant distance from the anchor.

FIG. 8 is an explanatory view for fully understanding the operation of the present invention, and is a sectional view showing the connection relationship between the crank arm 38 and the focusing block 34. A slot 60 is formed in the focusing block 34, which allows the focusing block to
The crank arm 38 is movable relative to an axis 62 connecting it to the focusing block.

(Effects of the Invention) With the configuration and operation described above, the present invention enables, for example, a large number of electric wires having different diameters to be tightly bundled and efficiently welded and connected.

The welding tip has a square shape and has four work surfaces that can be replaced at the corners of each side. When one work surface wears out, the tip can be rotated and replaced with another work surface. Furthermore, since the shape of the tip is simple, manufacturing costs can be reduced, and the number of work surfaces can be increased compared to the conventional method.

As shown in FIG. 1, the conventional workpiece has only two surfaces and has a complicated shape, which increases manufacturing costs and increases the number of defective products. The tip of this invention is constructed of only one square piece, which increases precision and greatly reduces the number of defective products.Moreover, it also increases the number of workpiece surfaces, greatly contributing to a reduction in manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 is a -@ sectional front view of a conventional Mi sonic welding device, FIG. 2 is a partially sectional front view of the main part of an embodiment of an ultrasonic welding device according to the present invention, and FIG. A partially sectional front view of the overall structure of the device, FIG. 4 is an enlarged front view of the open work area of the main part, FIG. 5 is a partially sectional front view of the partially closed work area, and FIG. 6 is a complete front view. Fig. 7 is a partially sectional front view of the work area in a closed state; Fig. 7 is a partially sectional front view showing the separation of the work area after wire end welding; Fig. 8 is a partial sectional front view showing the separation of the work area after wire end welding; Fig. 8 allows independent movement of the focusing block relative to the welding tip. FIG. 2 is a partially cross-sectional explanatory diagram showing a slot in a light condensing block. 12 ... ... Support part 18 ... ... Ultrasonic horn (ultrasonic vibration generating part) 20 ... ... Welding tip part 22 ... ... First work surface 26 ... ... Fixed part 28 ... Third work surface 32 ... Wire end 34 ... Focusing block 35 ... Fourth work surface 36 ... ...Groove (work area) 37...
・ ... 2nd work surface FIG, 1 (PRIORART) FIG, ?

Claims (10)

[Claims] (1) An ultrasonic horn that generates ultrasonic vibrations and has a welding tip with a first workpiece surface arranged parallel to the axis of the ultrasonic vibrations, and a size for holding and compressing the workpiece during the welding process. an adjustable groove, the adjustable groove being slidably disposed parallel to the first work surface for back and forth movement, the adjustable groove having a second work surface facing inwardly of the adjustable groove; a focusing block provided perpendicularly to the surface; and a third work surface that is adjustable with respect to the first work surface, facing the inside of the adjustable groove, and opposite the first work surface. a support portion having a fixed portion and a fourth work surface facing the interior of the adjustable groove and disposed perpendicularly to the first work surface and extending between the first work surface and the third work surface; The adjustable groove is thereby bounded by the first, second, third and fourth work surfaces and further includes means for reducing the size of the adjustable groove, the means including means for reducing the size of the adjustable groove when the workpiece is connected to the focusing block and the support. means for moving the second workpiece toward the fourth workpiece such that the workpiece is compressed between the welding tip and the fixing portion; An ultrasonic welding device equipped with means for moving a welding tip toward a fixed part. (2) means for increasing the reduced size of the adjustable groove, the increasing means spacing the focusing block and the ultrasonic horn from the fixed part such that the workpiece is released between the focusing block and the support part; 3. The ultrasonic welding apparatus of claim 2, further comprising means and means for spacing the focusing block and the ultrasonic horn from the fixed portion so that the workpiece can be removed from the adjustable groove. (3) A rectangular size having an ultrasonic welding device having an ultrasonic horn and a welding tip, and having first, second, third, and fourth work surfaces for holding and compressing the workpiece. disposing an adjustable groove, disposing a workpiece within the groove, and means for adjusting the size of the groove, the adjusting means comprising a second work surface disposed perpendicularly to the first work surface; An ultrasonic welding method comprising the above means of moving the work surface to the fourth work surface, and further moving the first work surface and the second work surface relative to the third work surface. (4) An ultrasonic horn that generates ultrasonic vibrations and has a welding head with a workpiece surface arranged parallel to the axis of the ultrasonic vibrations, and a size-adjustable groove for holding and compressing the workpiece during the welding process. a focusing block, the adjustable groove being slidably disposed for back and forth movement parallel to the workpiece surface and having an end face disposed at right angles to the workpiece surface; and a welding head adjusted relative to the workpiece surface. a fixing part that is freely disposed and has a workpiece surface that faces inside the groove and faces the workpiece surface of the welding head; and an end face that extends perpendicularly to the workpiece surface and is disposed below the fixation part. 1. An ultrasonic welding device comprising: a support section having a support section, wherein the groove section is partitioned from a work surface of a welding head by an end surface of a focusing block, a work surface of a fixing section, and an end surface of the support section. (5) An ultrasonic welding device having an ultrasonic horn and a welding tip is provided, a size-adjustable groove for holding and compressing the workpiece is provided, and the size of the groove is adjustable for holding and compressing the workpiece. partially surrounding the groove, disposing a workpiece within the partially enclosed groove, fully surrounding the groove such that the workpiece is compressed within the groove, and applying ultrasonic waves to the groove; An ultrasonic welding method consisting of the above means for welding workpieces by vibration. (6) An ultrasonic welding tip connected to an ultrasonic horn for welding the ends of electric wires, which allows for multiple substitutions around the tip that can continuously rotate in contact with the ends of the wires to be welded. an ultrasonic wave generator, characterized in that the tip has a convex polygonal cross section that is substantially independent of the concave surface, and the workpiece surface is formed at a corner of the convex polygon. Welding tip. (7) An ultrasonic welding device for welding ends of a plurality of electric wires, which is connected to an ultrasonic horn and an ultrasonic horn having a convex polygonal cross section substantially independent of a concave surface, and continuously welds ends of a plurality of electric wires. A welding tip with a plurality of interchangeable work surfaces formed in a rotatable convex polygon corner and a plurality of electrical wires in an adjustable size groove adjacent to one of the work surfaces of the tip. An ultrasonic welding device comprising means for forming a work area that confines an end, wherein at least one wall surface of the groove is one of the work surfaces of the welding tip. (8) An ultrasonic welding device for the end of an electric wire, comprising an ultrasonic horn, a rotatable welding tip attached to the ultrasonic horn, and a groove formed to hold the end of the electric wire to be welded. The welding tip consists of a fixed part provided opposite to the welding tip, and the welding tip has a polygonal cross section that is substantially independent of the concave surface, and has a plurality of work surfaces at the corners of the polygon, and has a plurality of work surfaces at the corners of the polygon. An ultrasonic welding device characterized by being interchangeable and capable of rotating around an ultrasonic horn. (9) An ultrasonic welding device for the end of an electric wire, comprising: an ultrasonic horn, a welding tip attached to the ultrasonic horn, and a groove formed in the welding tip to hold the end of the electric wire to be welded. a focusing block having an adjacent fixing portion and forming a wall surface of the groove movable toward and spaced apart from the groove and adjustable in its final work position relative to the welding tip; An ultrasonic welding device characterized by: (10) An ultrasonic welding device for welding ends of a plurality of electric wires, comprising an ultrasonic horn and a convex polygonal cross section connected to the ultrasonic horn and having a plurality of replaceable work surfaces, the workpiece The welding tip is formed into a convex polygonal corner that can be continuously rotated, and the welding tip is welded into an adjustable size groove adjacent to one of the work surfaces. means for forming a work area for confining the end of the wire, said means forming a wall surface of an adjustable size groove and configured to be movable and spaced apart from said groove, depending on its position with respect to the work surface of the welding tip; Ultrasonic welding characterized in that the workpiece position of the formed focusing block is adjustable in the lateral direction with respect to the welding tip, and at least one wall surface of the groove is one of the workpiece surfaces of the welding tip. Device.