CN87107696A

CN87107696A - Mask method for local silver-plating

Info

Publication number: CN87107696A
Application number: CN 87107696
Authority: CN
Inventors: 白连元; 李会长; 刘新; 王大风; 鲁君文
Original assignee: BEIJING SWITCH FACTORY
Current assignee: BEIJING SWITCH FACTORY
Priority date: 1987-06-13
Filing date: 1987-06-13
Publication date: 1988-07-27

Abstract

The present invention a kind ofly carries out the silver plated method of local surfaces to the electric product conductive pieces.Put a special in advance insulating sheath by plating on the part, utilize it with part do not need silver plated shaded surface, and will need silver plated surface to come out.In electroplating process, because the shielding effect of sheath, covered surface only produces galvanic deposit very slowly.When the coating of need surfacing reached pre-determined thickness, the thickness of coating on the non-surfacing reaches at most needed 10 of surfacing.When part goes out groove, earlier sheath is taken off, whole part continues to plate after 3～5 minutes again and goes out groove.As a result, each position overlay coating thickness distribution of part meets the requirements, and outward appearance is in full accord.Under the preceding topic of ensuring the quality of products, joint silver 50～80%, and ratio surface insulation method commonly used at present improves one times of work efficiency.

Description

The present invention is a kind of method of the electric product conductive pieces being carried out local silver-plating.It is silver-plated to be applicable to that the electric product manufacturing is carried out local surfaces to various conductive pieces.

The electric product manufacturing is in order to improve the quality of products, and conductive pieces carried out silver-plated, makes it have good conductivity.Conductive pieces often is not that its all surfaces all needs conduction, in order to save precious metal, be necessary only its conductive surface to be carried out silver-plated, Here it is local silver-plating.

The local silver-plating method of present domestic employing has:

1, brush plating method;

2, part immersed method;

3, surface insulation method;

Method 1, its production efficiency is very low, is unsuitable for property production in batches;

Method 2 only has end bar-shaped, strip part to electroplate and could adopt this method;

Method 3, this method is wide to the part suitability, is the method that widely adopts in producing at present.It is that the non-surfacing of part is wrapped up with the plastics cloth or with lacquer, plastisol coated, after the electroplated operation is finished, these insulants escaped again.Though this method can be applicable to the batch process of various difform parts, complex procedures, the coated of insulant all needs operation by hand with freeing, it is too many to take man-hour, and need dip painting installation, and take certain work-yard, the solvent evaporates of lacquer also can cause atmospheric pollution.

The present invention has overcome the shortcoming of above-mentioned three kinds of methods effectively, and it not only is suitable for the batch process of different shape part, and has simplified operation, saves man-hour, improves work efficiency, saves the work-yard, has solved the pollution of solvent to air.

The present invention puts a special in advance plastics jacket on by the plating part, utilize it to be covered in by the non-surfacing of plating part, and come out in the silver plated surface of require.Plastics jacket will can adopt thick 0.5～3 millimeter plastic plate, pipe etc., for example Vybak, vinyon etc. according to by the shape of plating part with to the special facture that requires of lining face.Should note keeping 0.1～2 mm clearance of having an appointment between covered of plastic cover and the part when making plastics jacket, and sheath can be plucked from part easily and takes off.

Representative instance is seen Fig. 1, Fig. 2, Fig. 3.The symbol of annotating: △ represents the gap among the figure, and on behalf of part, D hang eyelet, and φ represents hole, exposure garden.At Fig. 1 b, Fig. 2 b, among Fig. 3 b, 1 is plastics jacket, 2 is by the plating part.

In electroplating process, because the shielding effect of plastics jacket, only produce galvanic deposit very slowly on the covered surface, when the thickness of coating on the exposed surface of part reached preset value, the thickness of coating on covered mostly was 10 of thickness of coating on the exposed face most.When part goes out groove, earlier sheath is taken off, whole part continues to plate after 3～5 minutes again and goes out groove, and the distribution of part each several part overlay coating thickness meets pre-provisioning request like this, and the whole part appearance is the silvery white of uniformity.The maintenance certain clearance is the cleaning for ease of inter process between the covered surface of sheath and part, is unlikely and brings the raffinate of last process into next procedure.Plastics jacket can be repeatedly used.

Effect of the present invention:

1. it is remarkable to save silver-colored effect, with regard to single component, adopts local plating can save silver 40 to 80 percent than whole plating.In the electrical equipment manufacturing works more than 50,000,000 yuan, adopt local silver-plating can save silver in 1 year more than 200 kilograms with regard to an annual value of production, be worth 120,000 yuan.

2. raising work efficiency is compared with existing surface insulation method, has saved the preceding passivation of plating, and multiple working procedures such as oven dry, dipping lacquer, airing and insulation displacement so both can shorten working hour, enhanced productivity, and can reduce the collide with probability of part at inter process again.

3. saving work-yard:

Can save the operation field that carries out dipping lacquer, drying and peel off operations such as insulation layer.

4. avoid atmospheric pollution: exempted the atmospheric pollution of the organic solvent that is caused in the dipping lacquer process.

Implementing the present invention does not need existing equipment, condition are done any change, and operator also do special training, as long as plated the shape of part and the suitable plastic sheath is produced in the requirement of lining face can be realized according to our unit.

Claims

1, a kind of the electric product conductive pieces is carried out the local surfaces silver-coating method, its characteristics are to adopt a kind of special movable insulating sheath not need part the position of lining to hide.

2, make according to the geometrical shape of part with to the requirement of surfacing with insulating plastics according to the described sheath of claim 1 system.

3, keep 0.1～2 mm clearance according between covered of the described insulating sheath of claim 2 and the part, and sheath can take off from being plucked by the plating part easily.