DE2537362A1 - Electroplating connecting wires of electronic components - using iron-centred connectors attaching the components magnetically to a holding frame - Google Patents

Abstract

Equipment for handling large numbers of small electronic components such as resistors or diodes locates these in correct position using the magnetic attraction between holders contg. fixed permanent magnets and the connecting wires for the components which are copper-covered iron. Used in electroplating units which handle large numbers of components with copper-covered iron connecting wires and which are intended to plate these connecting wires with metals such as nickel or tin to make their subsequent soldering an easy matter. As compared with plating large numbers of components in revolving drums, this method greatly lessens the possibility if damage by bending of the fragile connectors, and it is cheaper in capital and operating costs than the alternative magazine handling appts.

Description

Device for holding small parts The invention relates to a device for receiving sensitive to mechanical stress Small parts with magnetic properties for the purpose of galvanic surface treatment as well as the use of this device in galvanic surface treatment of electronic components.

With the use of electronic components for measurement, control and regulation in technology, as well as the increasing spread of consumer electronics was the manufacture of diodes, resistors and other small parts in large Numbers required. These electronic components mainly have power supply lines Made of copper clad wire with an iron core, so-called HF wire. To have good solderability To achieve the power leads, it is necessary to do this with a soldering stick Layer of nickel, gold, tin or tin alloys to be coated. Suitable for this metal deposition in electroplating baths.

Since the power supply of the electronic components against mechanical They are very sensitive to stress, i.e. they bend easily Use of the previously known devices for galvanic surface treatment small parts keep causing problems.

The galvanic surface treatment of small parts is usually carried out in galvanizing drums. Here, however, the parts are subject to high mechanical stress. In the case of sensitive parts, such as B. electronic components leads this leads to a bending of a more or less large number of parts, whereby the risk of bending when emptying the drums is greatest. Because the parts automatically magazined after the surface treatment and read out by measuring technology the bent parts must be sorted out before the machines are loaded which requires a lot of work.

So-called electroplating magazines were used to eliminate the risk of bending developed into which the electronic components can be set. In these Magazines, the one power supply is dealt with first, then the magazine turned around 1800 and finally dealt with the second power supply. With this one Procedure does not cause any bends, but it has the disadvantage that through mutual shielding, the layer thicknesses of deposited metal are very uneven are, which means that the parts do not have a constant soldering behavior. aside from that turning the magazines requires a greater technical effort.

Due to the predominant use of copper sheathed wire with a The electronic ones have an iron core for the power supply Components magnetic properties that were previously found in devices for galvanic surface treatment these parts have not yet been used.

The object of the present invention is therefore to create a device for holding small parts that are sensitive to mechanical stress with lag tables Properties for the purpose of galvanic surface treatment that the disadvantages of the previously known devices and does not have a uniform electroplating these parts guaranteed without the risk of bending.

This object is achieved according to the invention by a device which is characterized in that it consists of a rectangular frame with a hanging device, magnets and attached between two opposite sides of this rainbow Contact strips arranged on both sides parallel to these magnets outside the frame plane, which are conductively connected to the frame.

Particularly advantageous embodiments of the invention consist in that a) the magnets and / or the contact strips are exchangeable, b) as magnets Permanent magnets are used, c) the distance between the magnets is dimensioned so that the parts to be picked up simultaneously by several, preferably are held by two magnets, d) the contact strips are provided with a profile, are preferably knurled or sawtooth-like.

The device according to the invention is particularly suitable for electroplating Surface treatment of electronic components, in particular diodes and Resistances.

Bending of the individual parts during the electroplating process is ruled out as they are held in place by the magnets. Get particularly good the parts held in place when they are being used simultaneously by several, preferably two magnets are attracted. In addition, the parts are attached by the magnets the contact strips are pressed on, so that a good and even absorption of the electroplating current is guaranteed is. In this way, uniform layer thicknesses are obtained in the galvanic metal deposition and thus a constant soldering behavior.

By using a profile, e.g. B.

knurled or saw-number-like shaped contact strips can Fixation of the parts can be further improved. The bearing surfaces are thereby at the same time reduced to a minimum.

The fixation of the sensitive small parts finally makes it possible also a stronger movement of the electrolyte, so that higher current densities are used can be. These lead to shorter exposure times and thus to higher throughputs.

The device according to the invention is charged and emptied in the usual way. It can also be carried out automatically.

So can for loading z. B. Diodes through a belt machine applied an electromagnet and with this to the magnets of the invention Device are brought up.

If the current of this electromagnet is then interrupted, they stick the diodes on the device according to the invention.

The emptying can also be done by an electromagnet, by z. B. subtracted the diodes through this from the device according to the invention and fed to the automatic sorting and measuring devices.

The frame and the suspension device of the device according to the invention serve as power supply at the same time. They usually consist of this Purpose used metals, e.g. B. copper or brass, and are with a protective coating Mistake.

As magnets, conventional permanent magnets are preferably used, which with be provided with an insulating cover, which also serves as a magnet holder.

The magnet holders and the contact strips are preferably exchangeable attached, as this enables a quick exchange if necessary. the Attachment can e.g. B.

done by screws. But you can also use conventional clamping devices can be achieved.

Usual plastics, z. B. polyvinyl chloride, can be used.

The device according to the invention is also suitable for use in conventional Electroplating machines.

In the drawing, an embodiment of the invention is shown, which should serve for a more detailed explanation.

Figure 1 shows the front view of a device that is partially with Diodes (1) is fitted. In a rectangular frame (2) with a hanging device (3) are interchangeably attached in several rows of magnetic holders (4). These Magnetic holders (4) are arranged so that the diodes (1) of two Magnets are held.

Figure 2 shows a section through a magnet holder (4), which from a permanent magnet (5), which is used to fix the magnetic field on both sides with Steel plates (6) is provided and has an insulating coating (7).

Contact strips (8) are exchangeable on both sides of the magnet holders attached. These are conductively connected to the frame (2) and are used for power transmission on the material to be electroplated.

Claims (6)

Claims »Device for receiving sensitive to mechanical stress Small parts with magnetic properties for the purpose of galvanic surface treatment, characterized in that it consists of a rectangular frame with a hanging device, magnets and fixed between two opposite sides of this frame Contact strips arranged on both sides parallel to these magnets outside the frame plane, which are conductively connected to the frame. 2. Apparatus according to claim 1, characterized in that the magnets and / or the contact strips are exchangeable. 3. Device according to claims 1 and 2, characterized in that permanent magnets are used as magnets. 4. Device according to claims 1 to 3, characterized in that the distance between the magnets is such that the parts to be picked up be held at the same time by several, preferably two magnets. 5. Device according to claims 1 and 2, characterized in that the contact strips are provided with a profile, preferably knurled or sawtooth-like are designed. 6. Use of the device according to claims 1 to 5 in the galvanic Surface treatment of electronic components, in particular diodes and Resistors F.