DE2223195C3 - Method and device for the non-thermal loosening of mechanical connections - Google Patents

Description

fix v. \. \ an ampliiiiden-controllable. in such mechanical connections and a single

Mechanical and hill-like device for carrying out the see encoder (16) is connected. 20 procedure, which are called these disadvantages

3. Device according to claim 2. thereby not occurring. The procedure is not intended to be excessive mark !, that with the clamping device i :: id, defective heating of the I to be separated rush (13) make connected pre-tensioning devices necessary and should be in the production line (17) are provided, which are used in support of the.

Release process of the connection, the plate (11) re- 25 This object is achieved in that one of the

Make a slight impression relative to the conical mandrel (15). connected parts until the connection is released

4. Device according to claims 2 and 3. mechanical vibrations in L'ltraschalllrequen / characterized in that the plate (11) is set out in an area: - · is.

Printed circuit board or board is. Q ^: I have another solution in a device.

5. Device according to claims 2 to 4, 3 ° which is characterized. that a Aufspanndadurcii characterized because ', the device to be released for clamping at least one of Llemente (10. 20. 30) in which Ϊ lalle is intended for printed a plate to be loosened. Circuits (11) soldered electrical components and that the jig firmly on a komente with connection pins. nut-shaped thorn Sitzi. whose other end to the Vi

35 braiion transmission fixed with an amplitude controllable. working in the ultrasound frequency range

mechanical encoder is connected.

This has the advantages that when using this simple and inexpensive method,

The invention relates to a method for 4 "mechanical connections and, in particular, electrical non-thermal connections Loosening mechanical connections see components and boards or cards with printed and device for carrying out the method. Circuits individually and selectively on non-thermal

From U.S. Patents 3,488,240, see manner can be removed, with neither be-4W808. 3 523 360 and 3 536 243 are already adjacent switching elements or the plate or card Devices and methods for the connection 45 itself can be damaged.

of parts with mechanical vibrations in Ul- The invention is based on the drawings in

known trashall frequency range. Not known to the individual explained. It shows

Since then, however, the use of such tig. 1 is an exploded view of the

High voltage energy for releasing or separating mc- according to the invention device for releasing an electrical Links. 50 Irish grounding bar from a plate or a

Today's trend in the construction of data processing boards with printed circuits by means of Ultraleiidon Systems go in the direction of miniaturization hall,

reu and microminiaturize. The new technology E i g. 2 is a scale representation of a

is based on an increase in the number of switching further embodiment of the invention circles and a reduction in the size of the package of this 55 device for releasing an electrical connection accompanied. The I Icrslellunji of the resulting rc- stifles from a board with printed circuit boards Cards and boards or plates for the gene by means of ultrasound and

printed circuit boards is extremely expensive. Furthermore, FIG. 3 shows a true-to-scale representation of the results during the repair and when replacing a fixture suitable for loosening, which is connected to Ulvon Components on the densely populated cards and fi ° traschall an electrical module with components from Blackboards or plates big problems. Often there are a board or blackboard with printed circuits Components. Wires and electrical connection pins also detach.

soldered to each other, and a separation of the connection In the embodiment of the invention according to

fertilizing makes the application of heat a must. 1 is a plate or board for printed scarf melts of the plumb bob is required. If the neighboring 65 hangings are shown, on which there are a multitude of verbarten Components on the printed circuit board can be of different electrical components, (• the board and especially electronic components Many of the boards used today for printed Schalwic 'Transistors. Chips, among other things, of the high temperature Hingen contain, for example, an earthing rail

3 4

10. the in one in Fig. 2 alternative printouts shown Circuits 11 is attached. In the prior art of the invention, the partial view is a Lowing embodiment of the invention have the TaIeI for printed circuits 11 with a through ί grounding bars 10 the shape of "U ^ -shaped Ka- the" board-guided electrical connection pin 20, the pluggable electrical connections; j shows. Usually these pins are used for this Ivps can take. For loosening an earthing rail with the "Board for printed circuits .erlotet. In

10 from a densely populated 'board for printed this case hai a special Aiifspanmorriehiun :. Circuits 11, according to the invention, have a special 21 a conical hole into which the electrical on-unplugging device 13 required. The clamping lug 20 slidably fits. The connection still direction 13 pal.lt between the two legs of the io 20 is with a screw 22 in the Aufspaniuorrich-

U-shaped channel of the earthing rail 10 and is fixed to mn 21. E3ic jig 2! siizt

fasten with screws 14 !. The jig on a connected to the ultrasonic generator H)

13 in turn is on a conical mandrel 15 conical mandrel 15. The connection still 20 can

attached, the siarr with an ultrasound tieber 16 by Uliraschallenergie preferably in the direction

connected is. 15 of the arrows 18 are released and removed. Have tests

During the release process of the electrical component, it is shown that the valley for printed circuits is called hot

ken Vorspannuu'j.sv (\ rrichtunü.en 17. which are not hesitant in an application of this Lkrascliallteehnik

The last position relative to the ultrasonic direction finder 16 will be digi.

are located, the board for printed circuit boards 11 and In other tests were '

relatively light pressure from the Utiraschallgebe. 16 way. 20 of the panel We printed SeIu. umgen 11 with ..- inci Lr-

With excitation of the ultrasound gel .6 with ultra-excitation movement in the transverse direction or

sound frequency occur vibrations in the direction of the plane-parallel to the 'IaIeI for printed circuits

Arrows 18 on. 11 removed. The process proceeded when in use

In the empirical 'keying of frequencies between 40 to 7OkIIz according to the invention, satisfactorily

Ultrasound apparatus were set to 25 to remove.

Boards door! Printed circuits 11 attached E-Ir- In Fig. 3 is yet another embodiment standard duiiiisschienen 10 frequencies / wischen 12 and a Modulelementcs 30 shown, which with Module-3 (IkHz used. In each case, the system was coordinated with the board for printed scarf, and the movements in the vicinity of the delight 11 is attached. Here is a fixture Interface were attached by a l.aserinierfe- 3 ^ direction 32, which leaves the module element 30, rometer monitors. The separation of the Lrdumis- Die Aulspannvorrichtun ». is in turn with the koschiene 10 connected by the printed circuit board nut-shaped mandrel 15, and the module 30

11 can be reached within a few seconds from TaIeI for printed sound systems 11 the. and who were raised to support the process by applying Uhiasound excitation Compressive stress, (usually less 35 wise in the direction of arrows 18 solved and unlearned than okg) is much lower than the one that will be for one.

When listed d ^ n unrecorded Ausliihrurjjsfiirmen which must be brought real • ■ Mechanical separation (about 45 kg). Tests have shown that ultrasonic energy is used as the separation medium in place of niche separations and electrical connections. While in the case of angen and the adjacent areas of the boards for 40 turn of the advanced technique, the separation of printed circuit boards causes severe damage to parts attached to one another with a minimum, and these boards for printed circuit boards can be damaged in some cases connecting a new earthing rail no longer facilitates loosening or removal for reinserting and / or preheating the tool to be clamped,
suitable is. The separation of the electrical elements achieved by the use of ultrasound, although rectilinear movements were used in the tests, is to be expected that even with rotating movements of the Erduiigs -iehiene 10 essentially movements resulted in a satisfactory resolution of this no damage to the Board for printed circuit connections can be reached,
11. The panels are for reconnection. A wobble technique can also be used and connected to the elements of the earthing rail, with the ultrasound apparatus being swept sinusoidally in a wide frequency range that can be repaired. Both. During this process, the resonance occurs in each loop. Ultrasound frequencies above 20 kHz occur. The use of a technique with fixed suggested, it can be used frequencies /. Between 10 resonance frequency but gives a more satisfactory up to 150 kHz. 55 How it works.

1 sheet of drawings

Claims (1)

ι ι are exposed to / in order to melt the solder Patent claims:! Is orderly. they can be functionally damaged will. The removal of complex or large rushes 1. Procedure / around non-thermal loosening mc- like Erdumis splints is using heat ehanic connections of parts. then roughened and usually penetrates the substrate marked that one of the most useful. Connected parts until the connection is loosened. Another problem then occurs. if the plumb The formation of mechanical parameters in the ultra- to separate the connections has melted. m- schalllrequen / hereich auseeset / i will. which the melted solder in undesired places 2. Device for carrying out the Ve ₁ , ah- io iiießi and "there electrical short circuits or other rens according to claim 1. characterized. Difficulties caused. that a jig (13. 21. 32) for many attempts to solve this and other Clamping at least one of a disk if problems still occur have been undertaken (1!) L-elements to be loosened (10. 20. 30) have been provided, but do not have the desired effect 'is and that the .Aulspannvorrichtung (13, 15 follow lying leads. 21. 32) firmly on a conical mandrel (15} The object of the invention is to provide a single With. Its other country for vibration-resistant and economical method of loosening