JP3986900B2 - Manufacturing method of ferrule connection sleeve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a ferrule connection sleeve.
[0002]
[Prior art]
Conventionally, zirconia has been the mainstream material for ferrules and ferrule connection sleeves, but many processing methods using metal as a raw material have been tried to improve various problems such as cost, productivity, and accuracy. Yes. That is, stainless steel, phosphor bronze, nickel, etc. are used as metal materials, and plastic working, turning, electroforming, etc. are performed as processing methods, and they are starting to enter the practical field.
In addition, there are two types of ferrule outer diameters that are supplied to the market: φ1.25 mm and φ2.5 mm, and there is an extremely small amount of eccentricity to meet the requirement to connect these with a predetermined eccentricity limit. A precision different diameter sleeve is required, and the purpose cannot be achieved by a manufacturing method other than electroforming.
[0003]
As for the sleeve, as described above, various manufacturing methods using metal materials have begun to be put into practical use. However, ferrules are currently in the zirconia monopoly market, and the suitability of the combination with ferrules is widespread of metal sleeves. Has become a bottleneck.
Conformity is a physical problem that occurs during friction between zirconia and metal in the press-fitting of a ferrule and a sleeve. In other words, repeating the engagement of zirconia with a sleeve having a clamping pressure is the same as the relationship between the shaft and the bearing, and the lubricity and abrasion resistance that have been regarded as important in the past have been added to the bearing. If it does not exist on the corresponding sleeve side, the durability is remarkably low and it is not suitable for practical use. At present, this measure is not taken, so a galling phenomenon occurs between the inner wall of the metal sleeve such as stainless steel or nickel and the surface of the zirconia ferrule, the sleeve is scraped off, and the fine powder metal is zirconia. After that, it becomes impossible to smoothly press fit.
[0004]
[Problems to be solved by the invention]
A metal material is used for the ferrule connection sleeve, and with respect to the required functions, the corrosion resistance, mechanical strength, elasticity, etc. can be adequately accommodated by the above manufacturing method, but between the press fitting with the zirconia ferrule, If the incompatibility similar to the bearing condition generated in the above is not solved, the practicality is remarkably impaired.
In the present invention, when manufacturing a normal zirconia ferrule connecting sleeve and a different diameter sleeve by electroforming, a copper plating layer or a copper alloy plating layer excellent in lubricity and abrasion resistance with respect to the ferrule material is provided on the inner surface. By providing, it aims at solving the conventional fault.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the following method is adopted for manufacturing the sleeve according to the present invention.
That is, in order to manufacture a sleeve having a good inner surface finishing accuracy by electroforming using a stainless steel core material, the surface of the core material is transferred as it is to the inside of the sleeve, so the dimensional accuracy and the finished surface state are good. It is necessary to prepare a core material.
[0006]
Hold the core material straight and vertical, attach it to a jig suitable for dipping in an electrolytic copper plating bath or copper alloy plating bath, and shield the vicinity of the core material mounting portions at the upper and lower ends with tape. While the core material rotates in the bath together with the jig, a copper plating layer or a copper alloy plating layer is formed on the surface. In order to make the plating thickness uniform and improve the efficiency, a plurality of positive electrodes are added in the bath. Sometimes. The plating thickness can be several tens of μm or less, and the galling phenomenon that occurs between ferrules and sleeves can be avoided, so the plating bath can achieve its purpose with a general copper sulfate bath, pyrophosphate bath, etc. If a copper-tin alloy (bronze) plating containing about 7% tin is performed to produce a bronze plating layer, better results can be obtained. When the copper plating layer or the bronze plating layer reaches a predetermined thickness, it is lifted from the bath solution together with the jig, washed with pure water, immersed in a sulfamic acid solution, and then immersed in a nickel sulfamate plating bath. Nickel electrodeposition is performed thereon to produce a nickel electroformed layer having a thickness (about 150 to 300 μm) having mechanical properties as a ferrule connection sleeve.
[0007]
In the nickel electrolytic cell as well as the copper electrolytic cell or copper alloy electrolytic cell, the jig may be rotated in the bath and a plurality of positive electrodes may be provided in order to make the thickness of the electroformed layer uniform and improve the efficiency. .
When the electroformed layer reaches a predetermined thickness, it is lifted from the electrolytic cell, the core material and the laminated plating are integrally removed from the jig, and the core material shielding tape is removed. Copper or copper alloy with good dimensional accuracy and finish on the inside, if the outer laminated plating part is fixed with a vise, the exposed part of the core material with the tape removed is added with a tool etc., and the core material is pulled out On the outside, a nickel electroformed layer sleeve can be manufactured. The incompatibility between the zirconia ferrule and the nickel sleeve is that the copper or copper alloy layer maintains lubricity and abrasion resistance against zirconia, and the required mechanical properties are It can be filled with a nickel electroformed layer.
[0008]
[Action]
According to this manufacturing method, the portion inside the sleeve that contacts the zirconia ferrule is copper or a copper-based alloy. It is widely known that the relative relationship between the ferrule and the sleeve has been dealt with experimentally rather than the conventional theory as well as a specific physical phenomenon occurring between the shaft and the bearing.
In general, a combination of a soft bearing and a shaft made of a soft material has been established, and a combination of zirconia and nickel is not suitable for repeated operations of press-fitting of a ferrule and a sleeve as described above.
As a material having excellent bearing performance, a copper-based alloy has been used for a long time, and has shown good lubricity and abrasion resistance. However, the copper or copper-based alloy plating layer on the inner surface of the sleeve according to the present invention can be used together with a zirconia ferrule. It has the same lubricity and abrasion resistance as the bearing alloy when it is rubbed. It operates smoothly without causing any change in the frictional part due to repeated operations of mating and detaching, and the inner surface of the nickel sleeve is in direct contact with zirconia. Compared with, there is a marked improvement in durability.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIGS. 1A and 1B show an example of a sleeve manufactured by the method for manufacturing a sleeve according to the present invention, and shows a generally-shaped sleeve having a gap in the generatrix direction. (A) is the front view which showed the bus-bar lower part in the cross section, (b) is a side view.
Chamfered shape portions 1a and 1b are formed at both ends of the completed sleeve 1, and a chamfered shape portion 1c is also formed at the inner edge portion of the gap S. These chamfered shapes are peculiar phenomena that are naturally generated during the manufacturing process by electroforming, but are extremely effective shapes for press-fitting ferrules.
As the stainless steel core material, the dimensional accuracy of the bearing needle class and the core material of the finished surface are used, and the core material surface is transferred to the copper or copper alloy surface of the inner periphery of the sleeve. The finished surface is obtained.
[0010]
2 to 6 show an embodiment of a method for manufacturing a sleeve according to the present invention.
FIG. 2 shows an example of a core material that has been subjected to non-conductive treatment. Nonconductive portions 3a and 3b are formed on the surface of the stainless steel core 2 finished to the bearing needle class by printing or resist processing. A single non-conductive portion 3a of the line width S is provided in the busbar direction, and a large number of linear non-conductive portions 3b are formed in the circumferential direction at intervals of the axial length of the sleeve 1 so as to be simultaneously formed from one core material. It is configured to obtain a large number of sleeves.
[0011]
FIG. 3 shows a state immediately before the core material 2 subjected to the nonconductive treatment is immersed in a copper or copper alloy electrolytic bath after being attached to a jig.
Members 5 and 8 for attaching the core material are provided above and below the resin jig body 4. 8 is a metal rotary shaft having a joint portion 8a with the motor shaft at the upper end, 7 is a set screw for fixing the core material 2 to 5 and 8, respectively, and 6 is a portion of the core material that is not required for electrodeposition and in the bath It is a tape that shields the exposed portions of 5, 7, and 8.
[0012]
FIG. 4A shows a state in which a jig with a core member is immersed in an electrolytic bath for copper plating to form a copper plating layer.
Reference numeral 9a denotes a power source, and reference numeral 10 denotes a motor for rotating the core material in the plating bath together with the jig, and the rotation is transmitted through the motor shaft joints 8 'and 8a of an easily detachable mechanism. Reference numeral 11 denotes a copper positive electrode. 13 is a bath solution for copper plating, 14 is an electrolytic cell, and 12 is a copper plating layer formed on the surface of the core material.
[0013]
FIG.4 (b) has shown an example at the time of producing | generating a copper type alloy plating layer in a core material.
Copper-based alloys include copper-zinc alloy plating (brass), copper-tin alloy plating (bronze), etc., and various methods have been carried out, but the figure uses a pyrophosphate bath and copper The state of copper-tin alloy plating production | generation by the method of performing electric current control with a separate power supply and circuit to an anode and a tin anode, respectively is shown.
9a is a copper anode power source, 9b is a tin anode power source, 11 is a copper positive electrode, and 17 is a tin positive electrode. 15 indicates a pyrophosphate bath solution, and 16 indicates an electrolytic cell.
[0014]
5 (a) and 4 (b), after the copper plating layer 12 or the copper alloy plating layer 18 reaches a predetermined thickness on the surface of the core material 2, a nickel electroformed layer is formed thereon. Indicates the state of generation.
4 (a) or 4 (b), after the completion of the plating of FIG. 4 (a) or FIG. 4 (b), the core material and the jig are pulled up from the electrolytic cell 14 or 16 while being integrated, washed with pure water, and as an example, nickel electroforming is performed using a nickel sulfamate bath. In the case of performing, it is desirable to perform pretreatment that sufficiently immerses in a sulfamic acid solution to improve the adhesion between the copper or copper alloy plating and the nickel electroforming. 9c is a nickel positive electrode power source, 19 is a nickel electroforming electrolytic bath, 20 is a nickel electroforming bath solution, and 21 is a nickel positive electrode, a plurality of which are provided as in FIGS. 4 (a) and 4 (b).
[0015]
The core material is rotated integrally with the jig in the bath by the motor 10 as in FIGS. 4A and 4B. Reference numeral 22 denotes a nickel electroformed layer formed on the copper plating layer 12 or the copper-tin alloy plating layer 18 in a laminated manner.
When the nickel electroformed layer 22 reaches a predetermined thickness, the core material and the jig are pulled up from the nickel electrolytic cell 19 while being integrated, the tape 6 is peeled off, the set screw 7 is loosened, and the core material is removed from the jig. A plurality of sleeves shown in FIG. 1 can be obtained at the same time by fixing the laminated electrodeposition portions 12, 22 or 18, 22 in the axial direction with a vise and pulling out the core material 2.
[0016]
FIG. 6 shows a cross-sectional shape of the laminated electrodeposition generated on the surface of the core material.
The non-conductive portion 3 is formed by printing ink or resist processing so as to have a cross-sectional shape as shown in FIG. Electrodeposition layers 12 (18) and 22 are formed in the portion where the non-conductive portion 3 does not exist, but the generation of electrodeposition proceeds so that the vicinity of the end portion of the non-conductive portion 3 partially overlaps along the ink gradient. Therefore, it is formed with an inclination in a direction that gradually separates from the surface of the core material, and both ends of the sleeve and the inner edge of the gap in the generatrix direction are both chamfered, which is extremely suitable for press-fitting of a ferrule. It becomes a shape.
[0017]
The above description shows that the electrodeposited layer of copper or copper alloy has a thickness of several tens of μm, and the electrodeposited layer of nickel has a thickness of about 150 to 300 μm. However, the thickness is limited to these thicknesses. However, the electrodeposition layer of copper or copper alloy may be several tens of μm or less. Further, the nickel electrodeposition layer may be 150 to 300 μm or less. The thickness ratio between the copper or copper alloy and the nickel electrodeposition layer is preferably about 10 times or more.
[0018]
【The invention's effect】
As described above, the present invention is constituted by the above-described methods and processes, and thus has the following effects.
(1) As a ferrule connection sleeve, a nickel electroformed sleeve using a stainless steel core has practical functions in terms of accuracy, rigidity, corrosion resistance, etc. It has been experimentally confirmed that there is a problem in the compatibility of friction, and nickel is scraped off by zirconia to form a fine powder and closely adhere to the surface of the zirconia ferrule, making it impossible to achieve smooth press-fitting.
According to the present invention, the copper or copper alloy plating layer is in contact with zirconia, but these have good compatibility with friction with zirconia, exhibit excellent lubricity and wear resistance, and cause the galling phenomenon as described above. It is possible to maintain a smooth press-fitting and pull-out force without occurrence, and to solve the problem by an easy process without impairing other features of the nickel electroformed sleeve.
[0019]
(2) If the material of the sleeve is not suitable for the mutual friction that occurs during press-fitting with the ferrule, it is also possible to provide a dissimilar metal layer or the like on the inside of the completed sleeve or to apply a lubrication treatment from the work as well. This is also impossible from the viewpoint of the accuracy of connection required.
According to the present invention, before the nickel electroforming process for forming the sleeve body, the core material is subjected to copper or copper alloy plating with good bearing performance such as lubrication and wear resistance. -The surface finish is transferred to these as they are, and a sleeve that fulfills the required functions can be easily completed.
[0020]
(3) As a ferrule connection sleeve that can be manufactured by an electroforming method using a stainless steel core material, various types of sleeves can be manufactured by changing the core material and the non-conductive treatment method. Also, excellent lubricating oil and wear resistance can be easily added in the above process.
FIGS. 7 (a) and 7 (b) show examples of types other than those described above. FIG. 7 (a) shows a number of geometric shapes instead of applying a clamping force to the press-fitted ferrule by a gap in the busbar direction. By providing an opening of a geometric pattern and reducing the rigidity, an elastic region is given to the entire sleeve. FIG. 7 (b) shows a sleeve of different diameters that can connect two types of ferrules having different outer diameters. Both (a) and (b) are provided with a copper or copper alloy plating layer on the inside according to the present invention. The same effect can be given by providing.
[Brief description of the drawings]
FIG. 1 is an example of a sleeve manufactured by a method for manufacturing a sleeve according to the present invention, and shows a sleeve having a general shape having a gap in the direction of the busbar, (a) is a front view showing a cross section of the lower portion of the busbar; Is a side view.
FIG. 2 is a perspective view showing an example of a core material that has been subjected to non-conducting treatment.
FIG. 3 is a view showing a state immediately before dipping in a copper or copper-based alloy electrolytic bath after a core material subjected to a non-conductive treatment is attached to a jig.
FIG. 4 is a front cross-sectional view showing a state in which a jig attached to a core material is immersed in an electrolytic bath to form a plating layer, and FIG. 4 (a) is immersed in an electrolytic bath for copper plating to generate a copper plating layer. FIG. 4B shows a state in which a copper-based alloy plating layer is formed by dipping in a pyrophosphate bath solution for copper-tin alloy plating.
5 is a front sectional view showing a state in which a nickel electroformed layer is formed on a copper or copper alloy plating layer on the back surface of the core material after reaching a predetermined thickness in FIG.
FIG. 6 is a diagram showing a cross-sectional shape of laminated electrodeposition generated on the surface of a core material.
FIG. 7 is a diagram showing an embodiment of the shape of a sleeve, and FIG. 7 (a) shows an example in which an elastic region is given to the entire sleeve by providing openings of a large number of geometric patterns to reduce rigidity. FIG. 7B shows a different diameter sleeve that can connect two types of ferrules having different outer diameters.
[Explanation of symbols]
1 Sleeve 2 Core material
3a, 3b Non-conducting part 4 Resin jig main body for core material electroplating 5 Core material lower end mounting part 6 Shielding tape 7 Core material set screw 8 Metal rotating shaft 8 'Motor shaft joint 9a Copper anode positive power source 9b Tin Anode power supply 9c Nickel anode power supply 10 Motor 11 Copper positive electrode 12 Copper plating layer 13 Copper plating bath 14 Copper plating electrolytic bath 15 Copper-tin alloy plating pyrophosphate bath 16 Electrolytic bath 17 Tin positive electrode 18 Copper-tin alloy plating layer (copper alloy plating layer)
19 Nickel electrolyzer 20 Nickel electroforming bath liquid 21 Nickel anode 22 Nickel electroformed layer

Claims (2)

A stainless steel wire or stainless steel rod is used as the core, a metal coating is electrodeposited on the surface, the core is drawn from the formed electroformed layer, and a thin pipe with a thick electroformed layer is used as a ferrule connection sleeve. In the manufacturing method of the sleeve to be used,
The stainless steel wire, or electrodeposited copper or a copper alloy as a first layer on the stainless steel rod, and electrodeposited nickel constitutes the product layer plating as the second layer,
A method for manufacturing a ferrule connecting sleeve, characterized in that the characteristics of copper or copper alloy and nickel can be shared with respect to the lubricity and wear resistance required of the sleeve. 2. The method for manufacturing a ferrule connecting sleeve according to claim 1, wherein the nickel electrodeposition layer has a thickness of 150 to 300 [ mu] m.

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