WO2000006806A2 - Vorrichtung zum galvanischen abscheiden und abtragen von metall - Google Patents
Vorrichtung zum galvanischen abscheiden und abtragen von metall Download PDFInfo
- Publication number
- WO2000006806A2 WO2000006806A2 PCT/DE1999/001923 DE9901923W WO0006806A2 WO 2000006806 A2 WO2000006806 A2 WO 2000006806A2 DE 9901923 W DE9901923 W DE 9901923W WO 0006806 A2 WO0006806 A2 WO 0006806A2
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- WO
- WIPO (PCT)
- Prior art keywords
- electroplated
- belts
- electrolyte
- belt
- electroplating
- Prior art date
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/16—Apparatus for electrolytic coating of small objects in bulk
- C25D17/28—Apparatus for electrolytic coating of small objects in bulk with means for moving the objects individually through the apparatus during treatment
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/02—Electroplating of selected surface areas
- C25D5/022—Electroplating of selected surface areas using masking means
Definitions
- the present invention relates to a device according to the preamble of claim 1, i.e. a device for the galvanic deposition of metal onto electroplating material to be coated and / or for the electroplating of metal from existing or thus plated electroplating material, with a conveying device by means of which the electroplating material can be drawn continuously through an electrolyte.
- Such devices are used, for example, but of course by no means exclusively to gold-plate contact elements for electrical connectors.
- the electrodeposition of metal onto the electroplating material to be coated with it can be accomplished particularly efficiently if the electroplating material - as in the device according to the preamble of patent claim 1 - is continuously drawn through the electrolyte.
- the conveying device pulling the electroplated material through the electrolyte can, for example, comprise one or more belts which are pulled through the electrolyte together with the electroplated material held thereon or between them. In this way, the electroplated material can be coated in a continuous process.
- Such electroplating is advantageous in that a large throughput can be achieved with little effort.
- this is ms- especially when - as for example in the case of contact elements for electrical connectors to be gold-plated - very large quantities of electroplated material with gold or other precious metals to be covered, a not inconsiderable disadvantage.
- the present invention is therefore based on the object of developing the device according to the preamble of claim 1 in such a way that the electroplating material to be electroplated therewith can be electroplated extremely quickly and in a highly selective manner.
- the part of the conveying device which requests the electroplating material through the electrolyte essentially completely encases the electroplating material and only leaves the parts of the electroplating material to be electroplated uncovered.
- the metal deposition and / or the metal removal can be carried out not only very easily and quickly (by means of a continuous process), but also very selectively (only at the very specifically uncovered points of the otherwise completely coated electroplating material).
- FIG. 2 shows the internal structure of a flow cell of the device according to FIG. 1,
- FIG. 3 shows another view of the internal structure of the flow cell according to FIG. 2,
- FIG. 4 shows the structure of a belt used to transport the electroplating material through flow cells according to FIGS. 2 and 3,
- FIG. 5 shows another view of the belt according to FIG. 4,
- FIGS. 6A to 6D show different possibilities of abutting adjacent belt segments of the belt according to FIGS. 4 and 5,
- FIG. 7 shows a representation to illustrate the drive and the toothing of two belts according to FIGS. 4 to 6,
- FIG. 10 alternative belt toothing mechanisms
- FIG. 11 shows a representation to illustrate the electroplating of items to be electroplated, conveyed by belts according to FIGS. 4 to 6, with flow cells according to FIGS. 2 and 3,
- Figures 12 and 13 of Figure 11 corresponding representations with modified straps and / or flow cells, and
- FIG. 14 shows an illustration to explain the automatic centering of belts according to FIGS. 4 to 6 m of flow cells according to FIGS. 2 and 3.
- the device for galvanic deposition and removal of metals on or from electroplated material which is described in more detail below, is a device for gold-plating contact pins for electrical connectors. At this point, however, it should be pointed out that there is no restriction; Devices of the type described can in principle coat any plating material with any metal and / or (by interchanging the anode and cathode) remove any metal from any plating material.
- the device consists of a first flow cell la, a second flow cell 1b, a first belt 3a, a second belt 3b, a first drive roller 5a, a second drive roller 5b, a first guide and lock roller 6a, a second guide and lock roller 6b , and a pressing force mechanism 7;
- the item to be electroplated is a strip or grid comprising a plurality of contact pins for an electrical connector (for example a so-called leadframe strip) and is identified in the figures by the reference number 8.
- the first belt 3a and the second belt 3b are each endless belts, the first belt 3a running counterclockwise around the first drive roller 5a and the first guide and locking roller 6a, and the second belt 3b clockwise around the second drive roller 5b and the second guide and locking roller 6b runs.
- the mutually facing sections of the belts 3a, 3b receive the electroplated material 8 between them and pull it through the flow cells la, lb; the belts 3a, 3b, the drive rollers 5a, 5b, and the guide and locking rollers 6a, 6b thus represent a conveying device by means of which the electroplated material can be drawn continuously through an electrolyte (containing the flow cells la, lb).
- the flow cells 1a, 1b are essentially chambers containing an electrolyte; In the example under consideration, the flow cells la, lb are flowed through by the electrolyte (preferably against the running direction of the belts la, lb).
- the flow cells la, lb have an identical structure in the example under consideration;
- the structure of the flow cell la is shown in a highly schematic manner in FIGS. 2 and 3, FIG. 2 showing the flow cell la (together with the first belt la, the first drive roller 5a and the first guide and locking roller 6a) m on a side
- FIG. 1 shows a sectional view (m of a view corresponding to the view according to FIG. 1)
- FIG. 3 shows the flow cell 1 a from below (according to the representation m of FIG. 2 seen from below).
- the flow cell la comprises an inflow channel 11, a main flow area 12, an outlet channel 13, an overflow area 14, an overflow outlet area 15, and an anode 16.
- the electrolyte flows through the inflow channel 11 m enters the flow cell la, passes through the main flow area 12, and leaves it via the outlet channel 13.
- the electrolyte also partly reaches the overflow area 14 and leaves the flow cell via the overcurrent outlet area 15. According to the representation m in FIG.
- the main current region 12 is delimited at the top by the anode 16 and at the bottom by the first belt 3a;
- the electroplated material 8 entrained by the belts 3a, 3b is subjected to a voltage and forms the cathode, as a result of which the anode 15 and the cathode m in the main current region 12 are at a relatively short distance from one another.
- a metal deposition therefore takes place on the parts of the electroplating material 8 not covered by the first belt 3a.
- the first belt 3a and the second belt 3b are designed in such a way that they receive the electroplating material substantially completely or between them (sheathing) and only leave the parts of the electroplating material to be electroplated uncovered.
- the belts 3a and 3b are largely identical in the example considered. However, it should be noted at this point that this is not necessarily the case. In particular, the recesses 31 and the deposition windows 32, which are described in more detail below, but also the other structures of the belts 3a and 3b can, in some cases, even have to be designed differently.
- FIGS. 4 and 5 The structure of the belt 3a is illustrated in FIGS. 4 and 5, FIG. 4 showing a top view of the side of the first belt 3a facing the second belt 3b, and FIG. 5 showing a top view of the side of the first facing the flow cell la Belt 3a shows.
- the first belt 3a is a relatively wide and thin band which is provided with depressions 31, deposition windows 32, toothing and drive holes 33, toothing knobs 34, sealing lips 35, overflow lips 36, and catch pins 37.
- the depressions 31 are designed, in cooperation with corresponding depressions of the second belt 3b, to completely absorb the plating material 8; they preferably have the negative contour of the electroplating material and then encase the electroplating material closely (without gaps).
- the catch pins 37 are, as the name suggests, pin-like elevations and are used for the intended purpose
- the catch pins 37 are positioned and spaced such that when they reach m assigned openings in the lead frame strip, the electroplating material 8 automatically comes to lie exactly in the recesses 31.
- the first belt 3a has the separation windows 32 already mentioned.
- the deposition windows 32 are window-like openings through which the electroplating material 8 is exposed locally to the flow baffles 1 a, 1 b. Where deposition windows 32 are located, specifically only there, electrolyte can reach the otherwise completely encased electroplating material 8 and cause local metal deposition.
- two separation windows 32 are provided for each belt and depression 31.
- a total of four deposition windows 32 are provided for each item to be electroplated (per contact pin). Two of these four deposition windows are arranged at the opposite ends of the contact pins, the two deposition windows provided at the respective contact pin ends lying opposite one another.
- only the ends of the contact pins, and only two opposite sides of them, are exposed (and gold-plated during electroplating). That the respective contact pins only on their Gold-plated ends impair their function in a harmless way, because the contact pins can only come there in contact with associated other contact elements (contact sockets).
- the fact that only two opposite sides are gold-plated from the contact pin ends also does not impair the function of the contact pins, since they are contacted only on two opposite sides when an associated contact socket a is inserted.
- the electroplating of the electroplating material can be selectively and exactly on those electroplating material sections be limited, which should actually also be galvanized. As a result, the consumption of the material to be deposited during the electroplating can be reduced to a minimum.
- the belts 3a, 3b essentially consist of an elastomer in the example under consideration and are (including the depressions 31, the separation window 32, the toothing and drive holes 33, the toothing knobs 34, the sealing lips 35, the overflow lips 36, and possibly even the catch pins 37) made by injection molding.
- the use of an elastomer for belt production proves to be advantageous because it is an elastic material and a particularly tight and dense coating of the electroplated material is possible.
- the production of the belts 3a, 3b by injection molding proves to be advantageous because the belts can be designed exactly as desired with minimal effort (in one piece and without any post-processing).
- the belts 3a, 3b are traversed at least in the longitudinal direction by one or more cores 39 which are made of non-stretchable, bendable and unbreakable material such as steel wire, chains, strands or plastic fabric. These souls 39 are extrusion-coated by the actual belt material (the elastomer) during belt production.
- the belt 3a, 3b is injection molded in segments, the individual belt segments 38 having to adhere to one another as firmly as possible. How firmly the belt segments adhere to one another depends, among other things, on how they meet.
- FIGS. 6A to 6D show some possibilities for striking adjacent belt segments.
- Figures 6A to 6D are partial side views of the first belt 3a; the course of the boundary surfaces between the individual belt segments 38 is indicated by dash-dot lines.
- FIG. 6A shows the simplest (and the least resilient) embodiment: adjacent belt segments 38 are simply butted against one another.
- the boundary surface between adjacent belt segments 38 runs obliquely.
- the belt segments 38 thereby come into contact with one another over a larger area and consequently also more firmly than is the case with the embodiment according to FIG. 6A.
- the boundary surface between adjacent belt segments 38 runs in steps.
- the interface is even larger and thereby results in an even stronger connection between the belt segments 38.
- a bead with an approximately circular cross section is provided on one side of the one belt segment, and this bead is extrusion-coated when the belt segment adjacent to it is sprayed.
- the adjacent belt segments are interlocked with each other; Even if the relatively long weld line breaks, the belt segments cannot, or at least not easily, separate from one another.
- the belts 3a, 3b run around drive rollers 5a, 5b and guide and locking rollers 6a, 6b.
- the belt sections running through the flow cells la, lb run parallel to one another in the same direction.
- the plating material 8 is received between these belt sections and is thus pulled through the flow cells 1a, 1b. So that the electroplated material 8 on the way through the flow cells only at the points with
- the first belt 3a and the second belt 3b are held close to one another (gap-free) on the way through the flow cells la, lb. Then the electroplated material is firmly printed in the recesses 31 and thus encased by the straps 3a, 3b in a particularly narrow manner (without gaps).
- the belts 3a, 3b lie close to one another on the way through the flow cells la, lb and are reliably held in this position is achieved in the example under consideration by the fact that they are on their common path between the guide and locking rollers 6a, 6b and the drive rollers 5a, 5b are connected to one another using a zipper system or other connection mechanisms.
- the straps 3a, 3b are connected using a zipper system, the zipper system being formed by the toothing and drive holes 33 and toothing knobs 34 already mentioned.
- the toothing and drive holes 33 and the toothing knobs 34 are designed such that they jam or tooth each other and cannot leave this position until the drive rollers 5a, 5b are reached; with the drive rollers 5a, 5b
- Toothed and drive holes 33 and the toothed knobs 34 are pulled apart again due to the divergent path of the belts 3a, 3b.
- the toothing and drive holes 33 have a double function. They serve on the one hand to take up the toothing knobs 34 m, and on the other hand they serve to engage with structures (teeth or other elevations) provided on the outer circumference of the drive rollers 5a, 5b and thus a slip-free drive of the belts 3a, 3b by the To enable drive rollers 5a, 5b.
- FIG. 7 shows a detailed illustration of the belts 3a, 3b in the area of the drive rollers 5a, 5b, it can also be clearly seen that the toothing and anti-punch holes 33 do not only have the toothing knobs 34, but also the outer circumference the drive rollers 5a, 5b provided teeth 51 m can come into engagement.
- a slip-free drive of the belts 3a, 3b can also be achieved, for example, in that the belts 3a, 3b are provided with separate driver contours.
- driver contours Possible examples of such driver contours are shown in FIGS. 8 and 9, said driver contours each being designated by reference numeral 40 and in the case of FIG. 8 by pins projecting laterally from the belts 3a, 3b, and in the case of FIG. 9 are formed by teeth that protrude upwards or downwards from the belts.
- the elements provided for interlocking the belts 3a, 3b i.e. the toothing and drive holes 33 and the toothing knobs 34 are designed differently than shown in FIGS. 7, 11 and 12.
- other types of toothed knobs can be used instead of mushroom-shaped toothed knobs.
- Possible examples of differently designed toothing knobs are shown in FIG. 10.
- FIG. 10 which shows a section of the first belt 3a and various toothed knobs of the second belt, the toothed knobs 34 can also be wave-shaped or cone-shaped, for example.
- the belts 3a, * 3b with the electroplating material 8 accommodated between them ideally run through the flow cells la, lb as shown in FIG. 11.
- the sealing lips 35 are sealing elements projecting laterally from the belts 3a, 3b. In the example considered, they have a triangular cross section and close any gaps that may exist between the belts 3a, 3b and the housing 17 of the flow cells la, lb, so that no electrolyte can escape between the belts 3a, 3b and the flow cell housings 17.
- the overflow lips 36 are sealing elements protruding on the flow cell side. In the example under consideration, like the sealing lips 35, they have a triangular cross section, but they only have an effect if the relative position of the flow cells la, lb and the belts 3a, 3b deviates more or less from the (centered) ideal position shown in FIG. 11 . A position in which this is the case is shown in FIG. 14. The situation and processes occurring in this case will be described later with reference to this figure.
- FIG. 11 The arrangement shown in FIG. 11 can be changed in many ways.
- the deposition windows 32 are at least partially assigned their own anodes.
- An example of such an arrangement is shown in FIG. 12.
- t it is possible to coat the region of the plating material exposed through the various deposition windows to different degrees within the same time;
- only "different" currents of different magnitude have to be made to flow between the cathode (the electroplating material) and the respective anodes.
- a chamber partition 18 m can protrude into the main current area. This can ensure that the respective anodes can only influence the deposition in the deposition windows assigned to them.
- FIG. 13 An example of this is illustrated in FIG. 13.
- the belt 3a only comprises the sealing lips 35. These protrude upward on the flow cell side and run in the groove-like recesses provided in the flow cell housing 17.
- the overflow lips 36 are replaced by the main flow area 12 and the overflow areas 19 of the flow cells 1 a, 1 b that separate the overflow areas 14.
- the overflow lips 36 come into effect when the belts 3a, 3b are not in the ideal position shown in FIG. 11, that is, for example, twisted and / or displaced by the flow cells 1a, Ib or run between the flow cells Ia, Ib.
- An example of such a misalignment of the belts 3a, 3b is shown in FIG. 14.
- the belts 3a, 3b are shifted to the right; the overflow lips 36 of the belt 3a abut the housing 17 of the first flow cell la and thereby interrupt the otherwise existing connection between the main flow area 12 and the overflow areas 14.
- the overflow lips 36 and the flow cells la, lb are namely designed in such a way that when they meet, the connection between the main flow region 12 and the overflow regions 14 is interrupted. This interruption has the consequence that the electrolyte can only flow via the main current region 12 and the outlet channel 13; the path via the overflow area 14 and the overflow outlet area 15 is blocked.
- the pressure which is established in the main flow region 12 is understandably greater when the overflow outlet region 15 is blocked than with more or less freely accessible overflow outlet area 15.
- the differently high pressures in the main flow areas 12 of the flow cells la, lb cause the belts 3a, 3b to shift, the shifting continuing until the pressures in the main flow areas are essentially identical. The latter is precisely the case when the belts are aligned in the center, as in the representation m in FIG. 11.
- Overflow area 14 overflow outlet area 15 and overflow lips 36 or overflow walls 19 can therefore be forced to automatically center belts 3a, 3b.
- the described device can be modified in many ways. Among other things, there is no restriction on producing the belts 3a, 3b by injection molding from injection-moldable (thermoplastic) elastomers; It is similarly advantageous if the belts 3a, 3b are instead made of crosslinking elastomers such as rubber, rubber etc. using a pressing process.
- injection-moldable (thermoplastic) elastomers such as rubber, rubber etc.
- the described device for the galvanic deposition of metal proves to be advantageous in several respects regardless of the details of the practical implementation. It enables a very quick, highly selective and qualitatively consistently good and extensive deposition and / or removal of metals on or from electroplating material to be carried out in a relatively simple manner.
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE19833715 | 1998-07-27 | ||
DE19833715.9 | 1998-07-27 |
Publications (2)
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WO2000006806A2 true WO2000006806A2 (de) | 2000-02-10 |
WO2000006806A3 WO2000006806A3 (de) | 2000-11-09 |
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PCT/DE1999/001923 WO2000006806A2 (de) | 1998-07-27 | 1999-07-01 | Vorrichtung zum galvanischen abscheiden und abtragen von metall |
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Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3723283A (en) * | 1970-12-23 | 1973-03-27 | Select Au Matic | Selective plating system |
US4029555A (en) * | 1975-05-23 | 1977-06-14 | Electroplating Engineers Of Japan, Limited | High-speed continuous plating method and apparatus therefor |
US4376017A (en) * | 1982-01-04 | 1983-03-08 | Western Electric Co., Inc. | Methods of electrolytically treating portions of digitated strips and treating cell |
EP0241079A1 (de) * | 1986-04-02 | 1987-10-14 | Meco Equipment Engineers B.V. | Verfahren und Vorrichtung zur Plattierung mit einer metallischen Schicht auf miteinander verbundenen metallischen Komponenten und/oder metallisierten Produkten |
EP0328278A1 (de) * | 1988-02-11 | 1989-08-16 | TWICKENHAM PLATING & ENAMELLING COMPANY LIMITED | Vorrichtung und Verfahren zur Verwendung einer Plattiermaske |
US5705043A (en) * | 1993-11-04 | 1998-01-06 | Suntec Trading Ag | Electroplating apparatus |
-
1999
- 1999-07-01 WO PCT/DE1999/001923 patent/WO2000006806A2/de active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3723283A (en) * | 1970-12-23 | 1973-03-27 | Select Au Matic | Selective plating system |
US4029555A (en) * | 1975-05-23 | 1977-06-14 | Electroplating Engineers Of Japan, Limited | High-speed continuous plating method and apparatus therefor |
US4376017A (en) * | 1982-01-04 | 1983-03-08 | Western Electric Co., Inc. | Methods of electrolytically treating portions of digitated strips and treating cell |
EP0241079A1 (de) * | 1986-04-02 | 1987-10-14 | Meco Equipment Engineers B.V. | Verfahren und Vorrichtung zur Plattierung mit einer metallischen Schicht auf miteinander verbundenen metallischen Komponenten und/oder metallisierten Produkten |
EP0328278A1 (de) * | 1988-02-11 | 1989-08-16 | TWICKENHAM PLATING & ENAMELLING COMPANY LIMITED | Vorrichtung und Verfahren zur Verwendung einer Plattiermaske |
US5705043A (en) * | 1993-11-04 | 1998-01-06 | Suntec Trading Ag | Electroplating apparatus |
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WO2000006806A3 (de) | 2000-11-09 |
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