JP2535862B2 - Partial plating holder and partial plating method using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a holder for partial plating for performing partial plating, particularly stripe plating, on a strip-shaped long object which is a material of a lead frame, for example.

<Prior Art> For example, a lead frame for a transistor is manufactured by subjecting a strip of metal, which is a raw material, to partial plating called stripe plating, punching it into a predetermined shape, and cutting it. To be done.

Conventionally, formation of such partial plating is performed as follows.

As shown in FIG. 4 and FIG. 5, a masking tape (plastic tape with adhesive, etc.) 15 is coated on a portion other than the portion 11 (hereinafter referred to as “plating portion 11”) on which the strip-shaped long object is plated, While being immersed in the plating solution 17 in the plating tank 16, the strip-shaped long object 10 and the soluble anode 14 installed in the plating tank 16 are energized to perform partial plating (striped plating 12).

However, this method requires the work of accurately attaching the masking tape 15 and the work of peeling off the masking tape 15 after the partial plating is completed, which is troublesome. Further, since the masking tape 15 is not reused from the viewpoint of securing the adhesive force, securing the attachment dimensional accuracy, etc., the masking tape consumption is large, which is disadvantageous in terms of cost and is a used masking tape. Equipment for disposing of 15 is also required.

Therefore, in order to overcome such a drawback, a mechanical masking method using an endless belt has been proposed.
That is, in this method, as shown in FIG. 6, a strip-shaped long object 10 which continuously runs in the direction of the arrow in the drawing is wound around a rotary drum 18 via a roller 19 and wound around several rollers 21. The endless masking belt 20 that is hung and circulates in synchronization with the rotary drum 18 is brought into close contact with the non-plated portion of the strip-shaped long object 10 on the rotary drum 18 (the strip-shaped long object 10 has its own tension and the endless masking belt 20. It is pressed against the outer peripheral surface of the rotating drum 18 by the tension). Then, the strip-shaped long object 10 covered with the masking belt 20 is placed in the plating tank 16
Partial plating is carried out by immersing the strip-shaped elongated object 10 and the soluble anode 14 installed in the plating tank 16 by immersing in the plating solution 17. Alternatively, although not particularly shown, the strip-shaped long object 10 covered with the masking belt 20 is provided with a non-masking portion (plating solution permeation liquid) from a nozzle installed along the inner peripheral surface or the outer peripheral surface of the rotary drum 18. Part)
It is sprayed on and energized to carry out partial plating.

In such a method, it is not necessary to dispose of the masking tape after each use as described above, but the number of parts is large, the structure of the plating apparatus becomes very complicated, the apparatus becomes expensive, and the operation is difficult. However, since the masking belt 20 can be coated only on the plated surface side of the strip-shaped long object 10, there are problems such as the wrapping of the plating on the non-plated surface side. Furthermore, in this method, it is not possible to superimpose the non-plating surface sides of two strip-shaped long products and plate them simultaneously.

Further, in partial plating, it is desired that the dimensional accuracy of plating and the sharpness of the plating boundary portion are excellent.However, in the mechanical mask method using a masking belt, when the masking belt is brought into close contact with the strip-shaped long object 10, the strip-shaped long object is generally used. On the other hand, since the position of the belt is unstable, the belt may be displaced and the dimensional accuracy of the plating is not so good.

The above-mentioned problems, particularly the problem of complication of the structure of the plating apparatus and the dimensional accuracy of plating, become more remarkable as the number of stripe platings increases.

<Problems to be Solved by the Invention> An object of the present invention is to solve the above-mentioned drawbacks of the prior art,
A holder for partial plating that has a simple structure without using a masking tape and a masking belt, and that enables partial plating with excellent plating dimensional accuracy and sharpness of the plating boundary portion, and a partial plating method using the same Especially.

<Means for Solving Problems> In order to achieve such an object, the inventors of the present invention have as a result of earnest research, and as a result, fixedly contact a surface to be plated of a continuous strip-shaped long object that is to be plated. A holder to be installed on a strip-shaped elongated object having a gas sealing means for preventing leakage of the plating solution from the vicinity of the opening while supplying the plating solution to the opening corresponding to the plating part. The present invention has been accomplished by finding a holder and a partial plating method using the holder.

That is, the present invention has an opening that can be partially applied to the surface of the strip-shaped long object by abutting the surface to be plated and supplying the surface with a plating solution to bring the surface into contact. At least one plating solution chamber having a supply port and a discharge port for the plating solution, a seal member installed near the opening, and a gas supply port, which are installed adjacent to both sides of the plating solution chamber, and the seal is provided. A pressurizing gas chamber configured to pressurize the contact portion between the member and the strip-shaped elongated object with the gas sent from the gas supply hole to prevent the plating solution from leaking from the contact portion. The present invention provides a holder for partial plating, which is characterized by

Further, the present invention has at least one plating solution chamber having an opening through which a strip-shaped long product can be plated, and having a supply port and a discharge port for a plating solution, and a seal member installed near the opening. A surface for plating a strip-shaped long object that continuously runs in the longitudinal direction in at least one partial plating holder that has a gas supply port and has a pressurized gas chamber that is installed adjacent to both sides of the plating solution chamber A sealing member and the strip-shaped long object by feeding gas into the gas chamber from the gas supply port while supplying and discharging the plating liquid from the supply port and the discharge port of the plating solution to the plating chamber. It is intended to provide a partial plating method characterized by performing partial plating so as to prevent the plating solution from leaking from the plating boundary portion by pressurizing a contact portion with.

In the partial plating holder, it is preferable that the supply port and the discharge port of the plating solution are installed alternately at a predetermined interval in the running direction of the strip-shaped long object.

The partial plating holder preferably has a plurality of plating solution chambers that are independent of each other.

Further, in the partial plating method of the present invention, the two non-plated surfaces of the strip-shaped long objects are superposed on each other, and the partial plating holders are respectively brought into contact with the surfaces of the strip-shaped long objects to be plated, It is preferable to perform partial plating on a strip of long strip material at the same time.

It is preferable that the partial plating holder has a plurality of plating solution chambers that are independent of each other, and that different types of plating be performed for each plating solution chamber.

Hereinafter, a holder for partial plating of the present invention and a partial plating method using the same will be described in detail with reference to preferred embodiments shown in the accompanying drawings.

FIG. 1 is a perspective view showing a structural example of a partial plating holder 1 of the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG.

As shown in these drawings, the holder 1 for partial plating of the present invention preferably contacts with the surface of the strip-shaped long object 10 to be plated so as to travel continuously in the direction of the arrow in the drawing, and is preferably arbitrary. It is fixedly installed by means. On the other hand, the surface of the strip-shaped long object 10 that is not plated, that is, the back surface, is in contact with the fixed guide plate 13. Alternatively, although not particularly shown, an endless belt or the like that circulates in synchronization with the running of the strip-shaped elongated object 10 may be adhered to the back surface of the strip-shaped elongated object 10 at a predetermined pressure. In this case, unlike the case where the fixed guide plate 13 is used, it is possible to prevent scratches on the back surface of the strip-shaped long object due to friction.

The partial plating holder 1 has at least one inside thereof.
It has one plating solution chamber 2. This plating solution chamber 2
For example, two stripe plating 1 shown by diagonal lines in Fig. 1
When carrying out steps 2 and 12, it is advisable to have the number of rooms corresponding to that number. When multiple plating solution chambers are provided,
It does not matter whether these are in communication with each other.

Further, when the holder 1 has a plurality of independent plating solution chambers 2 (which do not communicate with each other), it is possible to plate different kinds of plating metal in each plating solution chamber, whereby the strip-shaped length is increased. It is also possible to simultaneously perform two or more stripe platings of different metals on one surface of the scale 10.

At the tip of the plating solution chamber 2, there is an opening 3 that defines a portion 11 (the outer edge portion when the masking tape 15 to be described later is applied) of the strip-shaped long object 10 to be plated. The plating portion 11 of the strip-shaped long object 10 comes into contact with the plating solution to perform plating 12.

A seal member 6 is attached near the opening 3, especially around the opening 3 to prevent the plating solution from leaking to a portion other than the plated portion 11.

The seal member 6 is made of rubber, soft resin, sponge,
It is made of an elastic material such as plastic. However,
The sealing member 6 may be made of any material as long as the surface of the strip-shaped long object 10 slides in contact with the surface of the strip-shaped long object 10 without causing scratches and reacting with the plating solution. Good.

On the other hand, the holder 1 for partial plating is provided with a plating solution supply port 4 and a plating solution discharge port 5 which communicate with the inside of the plating solution chamber 2. This plating solution supply port 4 and discharge port 5
By connecting a predetermined pipe or the like to a circulation circuit for the plating solution (not shown), the plating solution is supplied to and discharged from the plating solution chamber 2.

The shape, the arrangement, etc. of the plating solution supply port 4 and the discharge port 5 (not shown, but preferably having a suction function) are not particularly limited, but as shown in FIG. It is preferable that the discharge ports 5 are alternately installed at a predetermined interval in the traveling direction of the strip-shaped long object 10.
The reason is that it improves the quality of the plated surface by increasing the current density by improving the flow rate of the plating solution in each plating solution chamber and improving the cleanliness of the plating solution.

A pressurized gas chamber 7 is provided on both sides of the plating solution chamber 2.
Are installed adjacent to each other, and a gas having a predetermined pressure is fed into the pressurized gas chamber 7 so that the seal member 6 and the strip-shaped long object 10 are provided.
A pressure is applied to the vicinity of the contact portion with the contact portion, and the vicinity of the contact portion is applied with an appropriate pressure that does not hinder the sliding of the strip-shaped long object 10 while contacting the seal member 6, that is, plating from the plating boundary portion 120. Ensures that the liquid does not leak and the plating boundary 120
It improves the sharpness of.

The gas is sent into the pressurized gas chamber 7 by means of the pressurized gas chamber 7
It is performed from a gas supply port 8 provided so as to communicate with the inside.

The shape and arrangement of the gas supply port 8 are not particularly limited,
For example, a slit-shaped gas supply port as shown in FIG.
Any other gas supply port such as a plurality of round holes may be used.

The actual supply of gas into the pressurized gas chamber 7 is generally performed by connecting one end of an air supply pipe to the gas supply port 8 and driving a compressor or the like connected to the other end of the air supply pipe. It may be performed by a typical air supply means.

The type of gas to be sent is not particularly limited, and in addition to air, any gas such as N ₂ gas or Ar gas may be used as long as it does not contaminate the plating solution or deteriorate the plating characteristics.

The pressure in the pressurized gas chamber 7 may be set to such an extent that the plating solution can be sufficiently prevented from leaking from the plating portion 11.

In order to prevent gas leakage in the pressurized gas chamber 7,
It is preferable to install the seal member 9 also in the vicinity of the contact portion with the strip-shaped elongated object 10 on the side not adjacent to the plating solution chamber 2.

The plating solution in the present invention means a plating solution based on a broad concept, and includes not only a target plating solution for metal plating or alloy plating, but also any brazing material such as solder or any liquid coating material such as paint. However, in the present specification, typical metal plating will be described as a representative.

Further, as the plating method, either electrolytic plating or electroless plating is possible.

When electrolytic plating is performed, electricity may be supplied by using the strip-shaped elongated member 10 as a cathode and the partial plating holder 1 itself as an anode as shown in FIG. In this case, the seal members 6 and 9
Also functions as an insulating material with the long strip 10. Further, the soluble anode 14 is separately installed in the plating solution chamber 2 of the holder 1 (see FIG. 3), or a plating tank is provided near the outside of the holder (not shown), and the soluble anode is installed in the tank. By doing so, it is possible to energize the long strip 10 (cathode).

FIG. 3 is a cross-sectional view showing an example of a partial plating method using the holder for partial plating of the present invention. As shown in the figure, the back surfaces (surfaces that are not plated) of the two strip-shaped long objects 10, 10 are overlapped with each other, and the plating surfaces of the strip-shaped long objects 10, 10 are respectively attached to the partial plating holders of the present invention. Contact 1, 1. In such a method, since the two strip-shaped long objects 10, 10 can be partially plated at the same time, the productivity is improved. Further, if plating is performed by bringing the holders for partial plating 1 and 1 of the present invention into contact with both surfaces of one strip-shaped long object 10, respectively,
It is also possible to partially plate the same or different metals on both surfaces of the strip-shaped long object 10 at the same time.

When the definition of the plating boundary portion 120 is insufficient only by sealing the plating solution by the pressurization in the seal member 6 and the pressurized gas chamber 7, as shown in FIG. A masking tape 15 for limiting the number of edges is attached so that the edge of the opening 3 of the plating solution chamber 2 is located slightly outside the plating boundary 120 defined by the masking tape 15, that is, the sealing member 6 is placed on the masking tape 15. Make sure they are in close contact. This improves the sharpness of the plating boundary portion 120. In addition, in the above-mentioned conventional partial plating method by attaching the masking tape, as shown in FIG.
As shown in the figure, the entire plating unnecessary portion must be covered with the masking tape 15, but in the above method, only the vicinity of the plating boundary portion 120 needs to be covered with the masking tape 15, so the consumption amount of the masking tape is It is reduced compared to the conventional method.

In addition, the holder 1 for partial plating having the structure shown in FIG.
Is different from the partial plating holder 1 shown in FIGS. 1 and 2 in the number and arrangement of the plating solution chamber 2 and the pressurized gas chamber 7,
The structure and function of each part are the same as those described above.

Although the partial plating holder 1 of the above-described embodiment has a linear structure in the longitudinal direction, the present invention is not limited to this, and may have a structure curved in an arc shape in the longitudinal direction.

<Action> A strip-shaped long object 10 that continuously runs in the direction of the arrow in FIG.
While the partial plating holder 1 is brought into contact with the plating surface of, the plating solution is supplied from the plating solution supply port 4 into the plating solution chamber 2, the plating solution is discharged from the plating solution discharge port 5, and the plating solution is circulated. For example, electricity is performed using the strip-shaped long object 10 as a cathode. The plating portion 11 of the strip-shaped long object 10 comes into contact with the plating solution at the opening 3 of the plating solution chamber 2 and is subjected to stripe plating 12.

The seal member 6 mounted near the opening 3 is a plated portion.
Although the plating solution is prevented from leaking to the outside, the gas is supplied from the gas supply port 8 to the pressurized gas chamber 7 which is installed adjacent to both sides of the plating solution chamber 2 so that the inside of the pressurized gas chamber 7 is predetermined. By pressurizing the pressure, the vicinity of the contact portion between the seal member 6 and the strip-shaped long object 10 is pressurized, so that the leakage of the plating solution outside the plating portion 11 is reliably prevented and the sharpness of the plating boundary portion 120 is enhanced.

<Effects of the Invention> The holder for partial plating of the present invention has the following effects.

(1) In a conventional partial plating apparatus using a masking belt, the structure of the apparatus is complicated, especially when a plurality of stripe platings are performed. However, according to the partial plating holder of the present invention, The structure is extremely simple.

(2) Since the holder for partial plating of the present invention is fixedly installed and used, the dimensional accuracy of plating is higher than that of the mechanical mask method using the endless masking belt, which may cause the belt to be displaced during circulation running. Greatly improved.

(3) Since the plating solution is sealed by the seal member mounted near the opening and the gas pressure, the plating solution is prevented from leaking to other parts than the plating part, and the sharpness of the plating boundary part is enhanced.

(4) The structure of the holder for partial plating of the present invention is such that two non-plated surface sides of long strips are superposed on each other and the holders for partial plating are abutted on both sides (plating surface side) of the two members at the same time. Since partial plating can be performed, productivity is improved.

(5) Even when strip-shaped long strips with different width dimensions or strip-shaped strips with different plating patterns are subjected to partial plating, prepare partial plating holders corresponding to each and easily replace them. be able to.

(6) The partial plating holder has a plurality of plating solution chambers that are independent of each other (do not communicate with each other), and if a plating solution of a dissimilar metal is supplied to each plating solution chamber, the dissimilar metal is provided on one side of the strip-shaped long object. It is possible to simultaneously perform two or more stripe platings.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration example of a holder 1 for partial plating of the present invention. FIG. 2 is a sectional view taken along line II-II in FIG. FIG. 3 is a cross-sectional view showing an example of a partial plating method using the partial plating holder of the present invention. FIG. 4 is a cross-sectional view of a conventional partial plating apparatus using a masking tape. FIG. 5 is a partially cutaway end view of the partial plating apparatus shown in FIG. FIG. 6 is a front view of a conventional partial plating apparatus using an endless masking belt. Explanation of symbols 1 ... Holder for partial plating, 2 ... Plating solution chamber, 3 ...
… Aperture, 4 …… Plating solution supply port, 5 …… Plating solution discharge port, 6 …… Seal member, 7 …… Pressurized gas chamber, 8 …… Gas supply port, 9 …… Seal member, 10 …… Band-shaped Long object, 11 ……
Plating area, 12 …… Striped plating, 120 …… Plating boundary area, 13 …… Guide plate, 14 …… Soluble anode, 15 …… Masking tape, 16 …… Plating bath, 17 …… Plating solution, 18
...... Rotating drum, 19 …… Roller, 20 …… Endless masking belt, 21 …… Roller

Claims (6)

(57) [Claims] 1. An opening which is brought into contact with a surface of a strip-shaped long object to be plated and which can be partially plated by supplying a plating solution to the surface to bring the surface into contact, At least one plating solution chamber having a supply port and a discharge port for the plating solution, a seal member installed near the opening, and a gas supply port, which are installed adjacent to both sides of the plating solution chamber, and the seal is provided. A pressurizing gas chamber configured to pressurize the contact portion between the member and the strip-shaped elongated object with the gas sent from the gas supply hole to prevent the plating solution from leaking from the contact portion. A holder for partial plating. 2. The plating for partial plating according to claim 1, wherein the supply port and the discharge port of the plating solution are alternately installed at a predetermined interval with respect to the running direction of the strip-shaped long object. holder. 3. The holder for partial plating according to claim 1 or 2, wherein the holder for partial plating has a plurality of plating solution chambers independent of each other. 4. An at least one plating solution chamber having an opening through which a strip-shaped elongated member can be plated and having a supply port and a discharge port for a plating solution, and a seal member installed near the opening. At least one partial plating holder having a gas supply port and having a pressurized gas chamber adjacent to both sides of the plating solution chamber, and a surface for plating a strip-shaped long object continuously running in the longitudinal direction. Abutting against, and supplying and discharging the plating solution into and from the plating solution chamber from the plating solution supply port and the discharge port, while feeding gas into the pressurized gas chamber from the gas supply port, the sealing member and the strip-shaped length. A partial plating method comprising pressurizing a contact portion with a scale to perform partial plating so as to prevent the plating solution from leaking from a plating boundary portion. 5. The two strip-shaped long members are brought into contact with each other by contacting the non-plated surfaces of the two strip-shaped elongated members with each other and contacting the surfaces of the strip-shaped long members to be plated with each other. The partial plating method according to claim 4, wherein partial plating is simultaneously performed on the scale. 6. The part according to claim 4 or 5, wherein the partial plating holder has plating solution chambers that are independent of each other, and performs different types of plating for each plating solution chamber. Plating method.