SU1419843A2 - Installation for welding bridges of microwire to contact spots - Google Patents

Abstract

The invention relates to microwelding, in particular, devices for contact microwelding of bridges from microwire to the contact area to m product, and can be used in instrument engineering in cases when microwire must be removed on one side of the weld point. 1T, the purpose of the invention is to improve the reliability of the product and the performance of the process due to a hard excess microwire secured from the sides of the product when the product is rotated around its own axis, perpendicular to the plane of the contact pads. The rotation of the product placed in the cylindrical recess of the supply bar-: bath is ensured by pressing it with a spring-loaded clamp made of friction material to the lateral surface of the product when the drum is fed. Switching the clamp on and off is set by the cams attached to the end surface of the drum. 4 il. (L with

Description

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one . 1419843 The invention relates to the field of | Welding, in particular, to devices for contact micro-welding of bridges from: Micro-wires to the contact pads of the product, and can be used in radio electronics and other fields of electrical engineering. A whole invention is to increase product reliability and plant performance by breaking a microwire after welding while rotating the product around its own axis, the perpendicular axis of the wire and the surface of the contact pads of the product.

Figure 1 shows the product with contact pads with welded: to them bridges from the microwire to the break of the extruded microwire, top view; FIG. 2 - the same, in the process of breaking off excess microwire; on fig.Z - installation according to the invention, a longitudinal section; FIG. 4 is a view A — on FIG. 3. FIG.

The product 1, on which the contact pads 2 and 3 are fixed, is fed to the welding position and the bridge 4 of the microwire 5 is welded. Then the microwire 5 is fixed in zazhma 6 and 7, and the product 1 is rotated around its own axis.

The installation consists of a housing 8, on which a rotational actuator 9 is fixed, which is connected via a shaft 10 to a driving disk 11, a cam 12 is fixed on the shaft 10, which interacts with a pusher 13, the pusher .13 is fixed in the housing 8 with reciprocating movement in it and constantly interacts with the leaf spring 14, which sets the compressive force. The spring 14 is rigidly connected to the yoke 15 of the compression mechanism. With the help of the hinge 16, the yoke 15 can rotate with respect to the housing 8 and move the electrodes 17 rigidly attached thereto to the welding position and press the microwire 5 to the contact

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pads 2 and 3, which, in turn, are electrically connected to the feed drum 18, which is simultaneously the lower electrode. The feed drum 18 is connected via a shaft 19 to a driven rotary disk 20, on the outer circumference of which there are movable pins 21 provided with springs 22. Each of the floating pins

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21 periodically interacts with the cam 23, which pushes this pin in the direction of the leading rotary disk 11, where this pin engages with a pin 24 rigidly mounted on the disk 1 at the same diameter as the pins 21. For switching on the welding The unit is equipped with a switch 25 attached to the housing 8, and to return the compression mechanism to its original position, it is connected with the housing 26 by means of a spring 26. To install the product 1 on the supply drum 18 therein. cylindrical recesses are made along the diameter of the product 1, while the center of the recess is mixed in the direction of the end surface of the feed drum 18 so that after installing the product 1 into its side recess

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tsovy surface. To ensure the rotation of the product 1 on the housing 8, a spring is fixed to 22; a spring 22 at its free end is fixed a clamp 28 made of a friction material and placed at the level of the product: LIA 1 behind the welding position. To control the press 28 to the side surface of the product 1, the cams 29 are fixed on the end surface of the feed drum 18 by the number of products 1 supplied, which, when interacting with the flat spring 27, press it together with the pressure clamp 28 from the product 1, and when the cam leaves 29 from contact with the spring 27, the pressing 28 is pressed against the product 1. The wire 5 is fed from the catupzha 30 with the help of clips 6 and 7 placed on the supply drum 18 between the supplied products.

The method of welding bridges using the proposed installation is carried out in the following way.

The product 1 with the contact pads 2, 3 is installed in the cylindrical recess of the feed drum 18 at the loading position using an automated loading device, for example, a vibrating hopper (not shown).

The wire 5 is unwound from the coil 30 and, having led through the open clip 6, is led to the clip 7. The clip 7 is opened manually, the wire 5 is inserted into it and the spring-loaded drive of the clip 7 is released (not shown), after which

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the drag 5 is clamped in the clamp 7. The actuator 9 is turned on. The rotation of the actuator 9 through the shaft 10 is transmitted to the turntable 11 and the cam 12, the Cam 12 turns, lifts the pusher 13 and the spring 14 together with the rocker arm 15, which rotates on the hinge 16. Electrodes 17 are lowered, the wire 5 is pressed to the contact pads 2 and 3. Further raising of the pusher 13 by the cam 12 provides the spring 14 deflection, which creates a predetermined compressive force and turns on the welding current switch 25. Welding occurs at two points, with the result that bridge 4 of microwire 5 is welded.

17 are embedded in microwire 5, flattening it in this place. Upon further rotation of the cam 12, the pusher 13 is lowered into the rocker 15

, with the spring 14, under the action of the spring 26 is rotated on the hinge 16, and the electrodes 17 are lifted. By this time, the pin 24, turning with the rotary disk 11, reaches the pin 21, rests on it and turns the disk 20 until the pin 21 does not get off the cam 23, after the turn of the disk 20, the shaft 14 and the feed drum 18 is stopped. In the process of turning the feed drum 18, the cam 29 on which the flat spring 27 is supported, comes out of contact with this spring and it slips off the cam 29, presses the presser 28 against the side surface of the product KB same time clamp 6 in company A rotating drum 18 grips the wire 5 With further rotation of the drum

18, item 1, pressed against a fixed one. The clamping 28, begins to rotate about its own axis, and the weld points, rotating with the product 1, move across the axis of the wire 5, while the excess wire 5 remains clamped in the clamps 6, 7, Since the least strong section of the wire is section

at the place of welding, the wire 5 is cut off at this point along the boundary of the weld point,

In the process of turning the feed drum 18, the next product 1 with the contact pads 2, 3 is fed to the welding position, and the next cam 29 lifts the spring 27, the cycle repeats. The next welding, rotation of the drum 18, breakage of the excess micro wire of the tandem 5, supply of the next product 1 and microwire 5 occurs. At the unloading position, product 1 with a welded bridge 4 drops out of the cylindrical recess of the feed drum, and at the loading position the next products 1 are automatically loaded. In case of poor-quality welding, t, e, obtaining a weak welded joint, microwire 5, together with bridge 4, is pulled out from contact pad 2 or 3, which is detected during the control inspection of the finished product or checking electrical circuits.

The invention allows to ensure 100% quality control of welding and screening of welded products due to wire breakage in the plane of the contact pads, eliminating the detachment of the contact pads, resulting in increased product reliability and plant performance.

Claims (1)

Invention Formula Installation for welding bridges from microwires to contact pads according to avt, sv, no. 1Q24194, characterized in that, in order to increase productivity, it is equipped with a unit for turning the product, made in the form of a spring-loaded clamp located on the housing on the outer side of the drum, and a cam - mounted on the drum with the possibility of periodic interaction with the clamp, which, in turn, is made of short-lived friction material. fi8,1 fae. 2  / V 8 12 10 n to g / yy / /five P 28 -: BUT Fig.b Back 7 4