JPS62205295A - Plated bellows and its production - Google Patents

Abstract

PURPOSE:To produce a bellows having high quality at a low cost with high mass productivity by subjecting the surface of a mold material to be plated which consists of a thermoplastic and has a bellows shape to plating then dissolving the mold material to be plated. CONSTITUTION:The thermoplastic such as ABS resin is worked by a molding machine to form the mold material 1 to be plated and precisely molded to the hollow shape which has a female mold bellows shape 1a and collar part 1b and is closed at the bottom end face and opened at the top end face. Such material 1 is immersed into a plating liquid by means of a rubber cover 4 having a detaining part 4a detained to the collar part 1b, by which nickel plating is executed. The plating is thereby stuck to the male mold bellows shape 1a and collar part 1b and the bellows 2 having a flange part 2a is formed. The cover 4 is thereafter removed and the material 1 is hung upside down and is heated in a low-temp. furnace, by which said material is dissolved away.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a plated bellows whose shaped material is made of plastic, and a method for manufacturing the same.

<Prior art> The conventional method for manufacturing plated bellows by menki is to cut an aluminum round bar into multiple strips with a lathe to form a plated material with a female or male bellows shape on the outside, and one end of the plated material is The aluminum is then immersed in a plating solution while supporting it, plated with nickel, then a notch is made in the bellows attachment part to cut the edge of the plating, and the plated part is supported and heated in a furnace. This is to elute the mold material to be polished consisting of.

Therefore, according to the above method, grooves are cut into a round aluminum bar one by one to cut a female or male bellows-shaped material to be plated, and chips and molten aluminum are separated from the edge of the plated edge. and other cumbersome handling, which leads to low mass productivity and high manufacturing costs.

Furthermore, in the past, only bellows with a stubby disk-shaped flat cylindrical portion could be manufactured. That is, all the disk-shaped flat cylindrical portions, which are the expandable unit elements of the bellows, had the same diameter. For heavy-duty bellows, the relationship between load and expansion/contraction is the following function to which Hooke's law can be applied, and this directly proportional relationship limits the range of use of bellows. The corresponding displacements to be controlled are often not proportional, in which case bellows cannot be used.

<Object of the Invention> The present invention was devised in view of the above-mentioned points, and one of the 11 points is that bellows of any form is high! λ The purpose is to provide a method for manufacturing roses that can be mass-produced at a significant cost reduction, and another purpose is to provide a method for manufacturing roses that can be manufactured in large quantities at a significant cost reduction. The object of the present invention is to provide a bellows having a pressure-displacement characteristic curve that is not a linear function and can be used directly between the displacement control side and the displacement control side.

<Structure of the Invention> First, the method for manufacturing the plated bellows of the first invention is as follows:
As shown in Figures 1 to 5, the inner or outer surface of a plated member 1 made of thermoplastics and having a female or male bellows shape is This method is characterized by performing plating 2 and then melting the mold material 1 to be plated.

Note that the plating 2 is made to have a required thickness so that there is at least no risk of destruction due to expansion when the plastic melts.

The plating time is related to the thickness; the greater the plating thickness, the longer the life, but the lower the sensitivity. The plating thickness is determined according to the purpose and diameter.

Nowadays, the molding material to be plated can be precisely molded using a molding machine, making it easy to mass-produce high-quality bellows and bellows having a pressure-displacement characteristic curve with high load value. In addition, it is preferable to use ABS or polyacetal resin as the constituent material, and the temperature is 220 to 230°C.
Can be heated and dissolved. As a heating means, melting in a low temperature furnace is possible, but glycerin liquid heated at high temperature may also be used. The plating 2 is preferably nickel plating by electroplating or electroplating, but may be electroless plating. Copper plating may be used instead of nickel plating. If electrolytic plating or electroplating is difficult to adhere to the plated material 1 depending on the material, electroless copper plating may be performed for some time as a pretreatment.
Electroplating or electroplating works well.

Then, a bellows mounting part 3 made of a heat-resistant material and capable of being plated is brought into close contact with one or both ends of the female or male bellows shape of the shaped material 1 to be plated. If attached, the strength of the bellows assembly will be increased.

In addition, in order to prevent unnecessary plating from adhering to the outer periphery of the flange part and to eliminate the edge cutting of the plated edges, it is necessary to It is sufficient to cover the resin with a cover 4 made of a material that can be plated, and then hang the cover 4, which shortens the process and eliminates plating scraps, making it easy to collect and handle the resin, and batch processing is extremely quick. It's easy to do.

Furthermore, if the cover 4 is provided with an electrode 5 which is inserted through the page into the shaped material 1 to be plated, and electroplating is performed while supporting the upper end of the electrode 5, plating can be performed quickly and batch processing can be performed.

Next, the bellows of the second invention of the present application, as shown in FIG.
The zero sign is that 1.21, 22.22, and 23.23 are formed so that one caliber differs.

Further, in the bellows of the third invention of the present application, as shown in FIG. 7, the bellows 2A with a small elastic modulus is arranged in the center, and the bellows 2B, 2B, 2B with a large elastic modulus are arranged around the periphery equally or on both sides. , bellows mounting part such as flange 3.3
The bellows are characterized by being integrated into a single body sandwiched between the two bellows.
An elastic curve having a curvilinear relationship can be obtained, and the plated bellows can be manufactured by the method of manufacturing the plated bellows of the first invention of the present application.

<Example> FIG. 1 shows a first example of the method for manufacturing a plated bellows of the present invention.

The plated material 1 is precisely molded to have a male bellows shape 1a on the outer surface, a flange 1b at the upper end, and a hollow shape with a closed lower end surface and an open end surface. And Tsuba 1
A rubber cover 4 having a W portion 4a that covers the upper surface and circumferential surface of b.
Cover and hang.

When nickel plating is performed by immersing it in a plating solution, the plating 2 adheres to the male bellows shape 1a, and a flange portion 2a is formed on the lower surface of the flange ib. Thereafter, the rubber cover 4 is removed, the mold is hung upside down, and the plated material 1 is melted to obtain a plated bellows 2 (manufactured by Kkkel). In the above case, since the circumferential surface of the collar 1b of the plated member 1 is covered with the cover 4, unnecessary plating is not attached to the outer edge of the flange portion 2a, and therefore, edge cutting of the plated edge is not necessary. In addition, the fact that the plated material l is hollow allows for economical use of raw materials.
The heating melting time can be shortened and the energy of the heating source can be saved. Note that gold plating is subsequently performed for applications that are exposed to corrosive gases.

FIG. 2 relates to a second embodiment of the method for manufacturing plated bellows of the present invention.

The molded material l to be plated is molded into approximately the same shape as shown in Fig. 1, an electrode case having an upper end 4a as a current-carrying part and a current-carrying ratio part is inserted into the hollow part, a cover 4 is covered, and a flange made of stainless steel or conductive ceramics is fitted. (Bellows attachment part) 3 is brought into close contact with the lower surface of the collar 1b of the mold material 1 to be plated by adhesive or heat fusion, and is forcibly fitted into the cover 4. Then, the upper end of the electrode 5 is suspended and immersed in a plating solution to perform electrolytic nickel plating.Then, the plating 2 adheres to the male bellows shape la, and the flange (bellows mounting portion) 3 is also plated integrally. Thereafter, the cover 4 and the electrode 5 are removed and hung upside down, and the plated mold material 1 is heated and melted to obtain a plated bellows 2.

FIG. 3 relates to a third embodiment of the method for manufacturing plated bellows of the present invention.

The plated material l has a female bellows shape la on the inner surface and a flange 1c at the lower end, and is formed into a hollow shape with the upper end surface closed and the lower end surface open, and a flange (bellows mounting Part) 3 is tightly attached, hanging 11: part 4at
- Has - Glue to cover the cover 4 with a large circumference. Then, the hook F114a is hung and immersed in the plating solution, the electrode is inserted from the bottom inside, and the plating solution is spouted to perform plating 2.Then, the cover 4 is removed and the hanging 2 mold material l to be plated is heated. When melted, a plated bellows is obtained. Since this embodiment inserts an electrode, it is applicable to large bellows. Can be applied to small bellows without inserting electrodes.

FIG. 4 relates to a fourth embodiment of the method for manufacturing plated bellows of the present invention.

The molded material l to be plated consists of a molded material main body (not numbered) molded into a hollow shape having a male bellows shape la on the outer surface and a flange 1b at the upper end, and a flange 1d which is a separate part that fits tightly into the lower end of the molded material body. Become.

The bellows mounting parts 3, 3 are hakama-shaped and have a pair of holes on the upper and lower sides, and a collar 1.
Before fitting e, pass it through the male bellows shape of the mold body,
Bring it into close contact with the collars 1b, ], and d. Then, the cover 4 having the hook portion 4a and the cover 4 without the hook portion are covered and plated. Then, the male bellows shape 1a is plated, the bellows mounting portion 3.3 is also plated, and when the cover 4 is removed and the molded material l is melted, a plated bellows 2 is obtained.

FIG. 5 relates to a fifth embodiment of the method for manufacturing plated bellows of the present invention.

The plated material 1 has a female bellows shape 1a on its inner surface and is formed into a hollow shape with open upper and lower end surfaces, and a pair of hakama-shaped upper and lower bellows mounting portions 3.3 are brought into close contact with the lower end surfaces. , a cylindrical cover 4 is fitted thereon. Then, plating is performed by suspending it in a plating solution while letting the plating solution flow into the inside, and then removing the cover 4 and dissolving the plated material 1 to obtain a plated bellows.

Next, FIG. 6 shows a plated bellows according to an embodiment of the third invention of the present application.

This mesokey bellows has a disk-shaped flat cylindrical part that is an elastic unit element, and has a small diameter of 21.21, a medium diameter of 22.22, and a large diameter of 23.23. They are connected in series.

Therefore, the elastic modulus differs depending on [+1)A, and the load acts on all the flat cylindrical parts,
- Since Funk's law holds true for each flat cylindrical part, the large expansion and contraction of the flat cylindrical part 21 with a small diameter, the moderate expansion and contraction of the flat cylindrical part 22 with a medium diameter, and the large [1 Small expansions and contractions of the flat cylindrical portion 23 of different diameters occur in series at different rates. Therefore, the elastic modulus of the bellows as a whole has a unique characteristic curve.

The background of this embodiment is that the bellows of the second invention of the present application has eight bellows of different diameters connected in series. The whole structure may be pyramid-shaped or barrel-shaped as long as it is connected to the . By making bellows of various shapes, measuring the relationship between pressure and displacement, and analyzing this using a combinator, it is possible to manufacture bellows with desired characteristic curves for various uses. .

FIG. 7 relates to an embodiment of the plated bellows of the third invention of the present application.

In this plated bellows, a disk-shaped flat cylindrical part, which is a telescopic unit element, is arranged between a pair of flanges 3, 3 with a small diameter one.
Three large-diameter bellows 2B, 2B are evenly arranged around the bellows 2A, or one small-diameter bellows 2.
Two large diameter bellows 2B on both sides sandwiching A.
This is a composite bellows with 2B arranged in parallel. Therefore, the bellows 2A with a small elastic modulus is stabilized by the surrounding bellows 2B, 2B with a large elastic modulus, and each bellows shares the load in proportion to its elastic modulus, and all bellows expand and contract uniformly. arise. Note that the number of bellows arranged in the center may be plural instead of one.

FIG. 8 shows the manufacture of the plated bellows shown in FIG. The composite bellows of the third invention can also be manufactured by the method for manufacturing plated bellows of the first invention.

<Effects of the Invention> As explained above, the method for producing plated bellows of the present invention has the following advantages:
Molding machines can produce highly precise plated shapes at low cost, making it easy to collect and handle resin, significantly reducing manufacturing costs, and realizing mass production of high-quality bellows.

In addition, since the molding machine can produce plated shapes with extremely high precision and in any shape, bellows can be produced that have a characteristic curve with a desired pressure-displacement relationship, like the bellows of the second and third inventions of the present application. This will dramatically expand the uses of bellows and increase the added value of bellows.

Further, in the plated bellows of the third invention of the present application, at least one of the disk-shaped flat cylindrical parts that are the elastic unit elements of the bellows is formed to have a diameter different from that of the other parts. Furthermore, in the bellows of the third invention of the present application, the bellows with a small coefficient of elasticity is arranged in the center, and the bellows with a large coefficient of elasticity are arranged evenly around the periphery and are integrated. Also, a characteristic curve can be obtained for the relationship between pressure and displacement. In other words, by making bellows of various shapes, measuring the relationship between pressure and displacement, and performing computer analysis to find out how to combine the diameters to obtain the desired characteristic curve, we can determine the shape of the material to be plated. A mold is obtained. As a result, it can be used for special purposes.

For example, it can be used directly without correction when moving a stroke controlled object in a desired curvilinear relationship relative to a varying pressure, or vice versa.

[Brief explanation of drawings]

1 to 5 relate to a method of manufacturing a plated bellows according to the first invention of the present application, FIG. 1 is a cross-sectional view according to the first embodiment, and FIG. 2 is a cross-sectional view according to the second embodiment. 3 is a sectional view of the third embodiment, FIG. 4 is a sectional view of the fourth embodiment, and FIG. 5 is a sectional view of the fifth embodiment. FIG. 6 is a cross-sectional view of an embodiment of the plated bellows of the second invention of the present application. FIG. 7 is a sectional view of an embodiment of the plated bellows of the third invention of the present application, and FIG. 8 shows the bellows of FIG. 7 manufactured by the method of manufacturing the plated bellows of the first invention of the present application. FIG. ■...Shape material to be plated, 2φ11e plating (bellows). 21.22.23, +1- flat cylindrical part of bellows, 2A
, 2B, 2B, 2B battle/Bellows, 3/Fu/Bellows take/1 part, 411 〇 Cover, 51- Electrode, Patent applicant Think Laboratory Co., Ltd. - Yamato Chogyo Co., Ltd. ZLaj '4 '1 (1 Figure 5 Figure 6 1.2

Claims (1)

[Scope of Claims] 1) Plating the inner or outer surface of a thermoplastic plastic material whose inner or outer surface has a female or male bellows shape, and then , a method for producing plated bellows, characterized by melting the plated material. 2) A bellows attachment part made of a heat-resistant material and capable of being plated is brought into close contact with a required end of the female or male bellows shape of the plated material, so that the bellows attachment part is plated. A method for manufacturing a plated bellows according to claim 1. 3) The plating according to claim 1 or 2, characterized in that an area other than the inner or outer surface of the female or male bellows shape of the plated material is covered with a cover made of a material that cannot be plated. Method of manufacturing bellows. 4) The method for manufacturing a plated bellows according to claim 3, characterized in that an electrode is provided which penetrates the cover and is further fitted into the plated material. 5) A plated bellows, characterized in that the disk-shaped flat cylindrical portions, which are the elastic unit elements of the bellows, are formed in series so that at least one of them has a different diameter from the others. 6) A plated product characterized by a bellows with a small elastic modulus placed in the center, bellows with a large elastic modulus placed around it evenly or on both sides, and integrated into a composite body at a bellows attachment part such as a flange. Bellows.