JPH0222492A - Plating method and plated parts - Google Patents

Abstract

PURPOSE:To shield parts not requiring plating with superior shape and dimensional accuracy when a member having parts not requiring plating is plated, by fitting plating parts made of a thermally shrinkable material to the parts not requiring plating and by adhering the plating parts to the member by heating. CONSTITUTION:When an Al core 1 composed of an upper cylindrical part 3 of a small diameter, a middle bellowslike part 2 and a lower cylindrical part 4 of a large diameter is partially plated, tubes 5, 6 made of thermally shrinkable polytetrafluoroethylene resin are fitted to parts of the cylindrical parts 3, 4 not requiring plating and the core 1 is heated to 100-200 deg.C to shrink and adhere the tubes 5, 6 to the parts 3, 4. The core 1 is then plated and the tubes 5, 6 are removed. A plated Al core having parts not requiring plating with superior shape and dimensional accuracy can simply be produced without requiring post-treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION (Prior Art) Conventionally, there are the following plating methods. FIG. 6 shows an aluminum core 100 to be plated. Almost the entire aluminum core 100 is plated,
Some parts do not require plating. In FIG. 6, A and B indicate parts that do not require plating. Conventionally, before plating, the unnecessary parts A and B were coated with a thermosetting resin to shield them, the entire aluminum core 100 was then plated, and the thermosetting resin was removed after plating was completed. was being carried out.

Still another conventional example is a method in which when there are parts that do not require plating, the unnecessary parts are removed by milling after plating.

(Problems to be Solved by the Invention) However, the above-described conventional plating method has the following problems. First, in the method of shielding by applying a thermosetting resin to areas that do not require plating, it is difficult to keep the applied area constant due to the viscosity of the resin.

Additionally, since highly corrosive chemicals are used in the plating and pre-treatment stages, the thermosetting resin is corroded, resulting in problems such as not being shielded or contaminating the pre-treatment and plating solution with the corroded resin. There is.

Next, in the method of removing unnecessary parts by lathing, dimensional accuracy may not be achieved due to occurrence of cracks, burrs, or blurring during lathe machining. Furthermore, since each product is processed one by one using a milling machine, there is a problem in that the cost is high.

The present invention was made in view of the above-mentioned problems, and its purpose is to provide a plating method and plated parts that do not require processing after plating and do not cause flaking or burrs. The purpose is to donate money.

(Means for Solving the Problems) The present invention having the above object arranges a plated part made of a heat-shrinkable member on a part of a material to be plated that does not require plating, and connects the plated part made of the material to be plated and the heat-shrinkable member. Heat it and bring it into close contact with areas that do not need plating, and plate the material to be plated. According to another invention, the plated part is made of a heat-shrinkable member that is attached to the plating material to shield portions of the material to be plated that do not require plating.

(Function) According to the plating method of the present invention, a plated part made of a heat-shrinkable member is placed on a portion of the material to be plated that does not require plating. Thereafter, the plated part consisting of the material to be plated and the heat-shrinkable member is heated. When the plated part is heated, the heat-shrinkable member contracts and comes into close contact with the material to be plated. Therefore, when plating the material to be plated, partial plating is completed without plating the parts that are in close contact with the plated parts.

When plating is performed using plated parts in this manner, the shield area can be kept constant, and there is no need for processing after plating, which prevents burrs, burrs, etc., and can also reduce costs.

(Example) The present invention will be explained below based on the illustrated example. 1st
The figure shows an aluminum core 1. The aluminum core 1 is made of aluminum and has a bellows 2 in the center. Small diameter cylindrical part 3 is shown in the upper part of the drawing.
, is provided with a large-diameter cylindrical portion 4 on the lower side. Small diameter cylindrical part 3
A part to be plated is formed in a part of the large diameter cylindrical part 4.

In this case, a resin tube 5.6 is used as a heat-shrinkable member or as a plated part.

The resin tube 5.6 is preferably made of heat-shrinkable resin.
Made from tetrafluoroethylene resin.

Such resin tubes 5.6 are attached to predetermined plating portions of the small diameter cylindrical portion 3 and the large diameter cylindrical portion 4, respectively. Then heat to 100°C to 200°C. This heating causes the resin tube 5.6 to contract and be fixed in place in the small diameter cylindrical section 3 and the large diameter cylindrical section 4.

In this case, the outer diameter of the aluminum core as the object to be covered and the heat-shrinkable tube (JUN FLONFEP) used for it.
) is shown in Table 1 below.

(Margins below) Table 1 After the resin tubes 5.6 are fixed at predetermined positions on the small diameter cylindrical portion 3 and the large diameter cylindrical portion 4, pretreatment is performed and plating is performed. Remove the heat-shrinkable tube after plating is complete. Finally, the aluminum is melted using a coating. Since the heat-shrinkable tubes 5 and 6 are used in this way, corrosion resistance is excellent, shielding is sufficient, and there is no contamination of the plating solution by the processing solution.

Next, a second embodiment is shown in FIGS. 2 and 3.

In this embodiment, a tapered surface 8 is provided on one side of the resin tube 5.6. In the plating method, an air pocket is generated at the interface between the resin tube 5.6 and the aluminum core 1 as the material to be plated.

Due to these air pockets, it may not be possible to plate the area where the air pockets have occurred during the plating process, resulting in plating defects. The tapered surface 8 is provided to prevent this air from forming. The tapered surface 8 is the resin tube 5
．． The angle between the surface 7 of the aluminum core 1 and the tapered surface 8 is preferably 15'' to 30''. This tapered surface 8 eliminates the retention of gas generated during plating at the interface between the resin tube 5.6 and the aluminum core 1, making it possible to prevent a plating defect called air focus.

A third embodiment of the present invention is shown in FIGS. 4 and 5.

In this embodiment, a processed portion 8a for attaching a resin tube is provided to attach the resin tube 5.6 to the aluminum core 1 as the material to be plated. The processed part 8a for attaching the resin tube is attached to the part of the aluminum core 1 that is not plated, and in this embodiment, an example is shown in which it is attached to the ends of the small diameter cylindrical part 3 and the large diameter cylindrical part 4. . In this case, the processed part 8a for attaching the resin tube consists of a concave part having the same shape as the resin tube 6 which has a ring shape with a roughly rectangular cross section, and the resin tube 6 is attached to the processed part 8a for attaching the resin tube.
When attached to the aluminum core, the outer surface 10 of the resin tube 6 and the outer surface 11 of the aluminum core form the same plane.

By attaching the resin tube 5.6 to the resin tube mounting processing part 8a in this way, no step is created at the interface between the side surface 10 of the resin tube 5.6 and the side surface 11 of the aluminum core 1. Plating defects caused by accumulations can be prevented. Also resin tube 5.6
The positioning of the resin tube 5.6 with respect to the aluminum core 1 becomes easy, and the work of attaching the resin tube 5.6 becomes easy.

Note that the resin tubes 5 and 6 are attached to the resin tube attachment processing part 8a of the aluminum core 1, and then
It is the same as in the first embodiment that the resin tube 5.6 is heated to 0' and attached to the resin tube attachment processing section 8a, and then plated.

Although the heat-shrinkable member has been described using a resin tube as an example, it may be made of other materials as long as it has heat-shrinkable properties.

(Effects of the Invention) According to the plating method of the present invention, the plated parts made of the material to be plated and the heat-shrinkable resin are heated and brought into close contact with the parts that do not require plating, and because the material to be plated is plated, it has strong corrosion resistance.
The shielding is sufficient, there is no contamination of the plating solution or pre-treatment solution, and since the shielding area is kept constant, there is no need for processing after plating, and no flaking or burrs occur. Further, when the resin tube is provided with a tapered surface, there is no retention of gas generated during plating, and plating defects due to air pockets can be prevented. Furthermore, when a processed part for attaching a resin tube is provided, the side surface of the resin tube and the outer surface of the aluminum core form the same plane, so that air pockets can be prevented.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a first embodiment of the plating method and plated parts of the present invention, FIG. 2 is an explanatory diagram of the second embodiment of the present invention, and FIG. 3 is a cross-sectional diagram of a resin tube. 4 and 5 are explanatory diagrams of a third embodiment of the present invention, and FIG. 6 is an explanatory diagram of a conventional plating method. Explanation of symbols 1... Aluminum core 2... Bellows 3... Small diameter cylindrical part 4... Large diameter cylindrical part 5.6... Resin tube 8... Tapered surface 10 ... Outer surface of resin tube 11 ... Outer surface of aluminum core Figure 4 Figure 5

Claims (4)

[Claims] (1) Place a plated part made of a heat-shrinkable material on the part of the material to be plated that does not require plating, heat the plated part made of the material to be plated and the heat-shrinkable material, and bring it into close contact with the part that does not need plating, and then A plating method consisting of plating on. (2) A plated part characterized by being made of a heat-shrinkable resin that is attached to a material to be plated to shield parts of the material to be plated that do not require plating. (3) The plated part according to claim 2, which has a tapered surface on one side surface for allowing air to escape during the plating process. (4) A material to be plated, which is provided with a processing section for attaching plated parts to which the outer diameter of the plated part matches the outer diameter of the plated part.