DE2223195B2 - METHOD AND DEVICE FOR NON-THERMAL RELEASE OF MECHANICAL CONNECTIONS - Google Patents

Description

mechanical encoder is connected.

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

The invention relates to a method for 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-3 499 808, 3 523 360 and 3 536 243, adjacent switching elements are still 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

trasound frequency range known. Not known to individuals explained. It shows

However, since then the use of such Fig. 1 is an exploded view of the

Vibration energy for releasing or separating the device according to the invention for releasing an electronic Links. 50 tric earthing bar from a plate or a

Today's trend in the construction of data processing boards with printed circuits by means of ultratends Systems is moving in the direction of miniaturized sound,

and microminiaturize. The new technology F i g 2 a scale representation of a

is based on an increase in the number of switching further embodiment of the invention circuits and a downsizing of the package of this 55 device for releasing an electrical connection circuit accompanied. The production of the speech pen from a board with printed circuit unsults 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 clamping device according to the invention that results in the repair and replacement of the clamping device with L ^T 1 of components on the densely populated cards and "ο traschall an electrical module with components of panels or panels. Frequently, a panel or a board with printed circuits also detaches components, wires and electrical connection pins.

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 fig. 1 is a plate or board for printed scarf melts of the plumb bob is required. If the neighbors are shown, on which a large number of the verbarten Components on the printed circuit board can contain various electrical components, or board and in particular electronic components Many boards used today for printed scarf such as High temperature transistors, chips and the like contain, for example, a grounding rail

10, which are printed out at several locations 12 on the board for In an alternative printout shown in FIG Circuits 11 is attached. In the present embodiment of the invention, the partial view is a According to the embodiment of the invention, the board for printed circuit boards 11 has a through Earthing rails 10 in the form of /> U "-shaped Ka- the panel-guided electrical connection pin 20 sewn, which shows plug-in electrical connections. Terminal pins of this type are commonly used can take. Soldered to the printed circuit board for loosening a grounding rail. In

10 from a crowded board for printed

Circuits 11 is a special one according to the invention

Jig 13 required. The clamping __

direction 13 fits between the two legs of the io 20 is secured with a screw 22 'in the jig

"U" -shaped channel of the grounding rail 10 and is attached to tune 21. The jig 21 is seated

fastened with screws 14. The jig "- - - ^,,

13 is in turn on a conical mandrel 15

In this case a special jig 21 has a conical hole into which the electrical connection pin 20 slidably fits. The connector pin

attached, which is rigid with an ultrasonic transducer 16

on "a conical mandrel 15 connected to the ultrasonic transducer 16. The connecting pin 20 can

_ _o __ by ultrasonic energy preferably in the direction

connected is. _{15 of the arrows 18 ge} ] _{east un (} j are removed. Tests have

During the release process of the electrical component, it is shown that the boards for printed circuits are positioned relative to the ultrasonic transducer 16 with no pretensioning devices 17, which, in an application of this ultrasonic technology, do not affect the position.

located, the printed circuit board 11 and In other tests, the connector pins 20 were made

relatively light pressure away from the ultrasonic transducer 16. 20 of the board for printed circuits 11 with an Er-Bei Excitation of the ultrasonic transducer «! 16 with ultra-excitation <= movement in the transverse direction or sound frequency occur vibrations in the direction of the plane-parallel to the board for printed circuits Pieilel8auf. U away. The process proceeded when in use

When empirically touching frequencies between 40 and 70 kHz according to the invention, the ultrasound apparatus satisfies were set to a = to remove.

Boards for printed circuit boards 11 attached to Er- In Fig.3 is yet another embodiment

dungsschienen 10 frequencies between "Ϊ2 and a module element 30 shown, the module with 3OkHz used. In each case, the system was matched to terminal pins 31 on the board for printed formwork, and the movements in the vicinity of the lungs 11 is fixed. Here is a fixture Interface were attached by a laser interface 30 direction 32, which holds the module element 30, rometer monitors. The separation of the grounding device 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 the printed circuit board 11 the and preferred to support the process by applying ultrasound excitation Compressive stress, (usually less 35 solved in the direction of the arrows 18 uni removed than 9 kg) is much less than that which will be for one.

real mechanical separation (approx. 45 kg) aul- In the above-described embodiments of the

must be brought. Tests have shown that mecha- invention uses ultrasonic energy instead of nischc separations the electrical connection sticks- heat is used as a separating medium. While at Angen and the adjacent areas of the panels using the technique shown for separation Printed circuits cause severe damage to one another to a minimum of attached parts

and these printed circuit boards into one ~

Change the state that is no longer necessary for reinserting and connecting a new earthing bar suitable is. The separation of the electrical elements achieved through the use of ultrasound from the ground bar 10 resulted in essentially no damage to the printed circuit board 11. The panels are for reconnection

of the elements of the earthing rail are suitable and acceptable, with the ultrasound apparatus in a whimble Repairs can be made. Frequency range is swept sinusoidally. at the. this process occurs in each loop the resonance

There are ultrasonic frequencies above 20 kHz frequency. Using a technique with solid Suggested, there can be frequencies between 10 resonance frequency but gives a more satisfactory one up to 15OkHz can be used. 55 How it works.

If damage occurs, in some cases the tool to be clamped can be heated up or preheated facilitate detachment or removal.

Although rectilinear movements were used in the tests, it is to be expected that the same would be true of rotational movements satisfactory release of these connections can be achieved.

A "wobble" technique can also be used

For this 1 sheet of drawings

Claims (5)

ι 2 are exposed, which is necessary to melt the solder. They can be functionally damaged. The removal of complex or large parts 1. Method of non-thermal loosening me- like grounding rails is when using heat mechanical connection of parts, time consuming and usually renders the substrate impermeable marked that one of the most useful. connected parts to loosen the connec- Another problem occurs when the solder mechanical vibrations in the ultra- to separate the connections is melted, m- is exposed to the sound frequency range. which the melted solder in undesired places 2. Device for carrying out the method flows and there electrical short circuits or other rens according to claim 1, characterized in causing difficulties. that a clamping device (13, 21, 32) for many attempts to solve this and other Clamping at least one of a plate with still occurring problems have been undertaken (11) to be released element (10, 20, 30) have been provided, but do not have the desired increase is and that the jig (13, 15 follow performed. 21, 32) firmly on a conical mandrel (J5) The object of the invention is to provide a seated, the other end of which is for vibration transmission, an economical and economical method of loosening supply fixed with an amplitude controllable, in such mechanical connections and a one-ultrasonic frequency range working mechanical and cheap device for carrying out the see encoder (16) is connected. 20 procedures to avoid these disadvantages 3. Device according to claim 2, thereby not occurring. The procedure is not intended to be excessive indicates that with the clamping device and «defective heating of the parts to be separated (13) make associated preload 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 Press slightly relative to the conical mandrel (15). connected parts until the connection is released 4. Device according to claims 2 and 3, mechanical vibrations in the ultrasonic frequency thereby characterized in that the plate (11) is exposed to an area. Printed circuit board or board is. Another solution is a device 5. Device according to claims 2 to 4, 30 which is characterized in that a clamping thereby characterized in that the device to be released for clamping at least one of Elements (10, 20, 30) is provided in the plate for printed a plate to be detached element, Circuits (11) soldered electrical components and that the jig firmly on a komente with connecting pins are. nut-shaped mandrel, the other end of which is 35 bration transmission fixed with an amplitude controllable, working in the ultrasonic frequency range