JP2002301565A - Method for producing complexed cylindrical or columnar body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method with which a complexed cylindrical or columnar body excellent in mechanical joined strength and electric conductivity of a core material and a sleeve material can be easily produced, in the constitution concentrically complexing the metal-made sleeve material to the cylindrical or the round columnar metal-made core material. SOLUTION: The core material 1 and the sleeve material 2 are prepared with a dimensional relation expecting an interposing space of a brazing material 3, and after plating the brazing material on the outer peripheral surface of the core material and on the inner peripheral surface of the sleeve material, the core material 1 and the sleeve material 2 are concentrically set and fitted in a state of perpendicularly standing on a supporting table 5. The whole body is inserted into a furnace in a state of connecting so that molten metal in a molten metal bath 18 can be supplied into the lower end of the gap 6 between the core material 1 and the sleeve material 2, and molten brazing material is supplied into the gap 6 and thereafter, the core material and the sleeve material are brazed by cooling to produce the complexed cylindrical or columnar body excellent in the mechanical joined strength and electric conductivity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an inexpensive composite cylindrical (or composite cylindrical) product such as a roll with a sleeve, in which a core material and a sleeve material are combined with each other. And a method for manufacturing them collectively.

[0002]

2. Description of the Related Art An example of a conductor roll for supplying cathode power to a thin metal plate to be plated in an electroplating line will be described below. Conductor rolls are frequently deteriorated and worn out of the roll body, which is the end of the rolling contact with the metal sheet, and require frequent repairs. For this reason, rolls with sleeves that can be repaired at low cost by replacing the sleeve material are frequently used. ing. In a conductor roll with a sleeve, since a large current of several thousand amps flows across the core-sleeve interface, uniform high conductivity is required at the interface. In addition, it is a preferable requirement that the sleeve material can be easily attached and detached.

For this reason, the composite of the core material and the sleeve material has conventionally been performed by shrink fitting. However,
There is a problem that shrink fitting involves a complicated process and costs. This is because shrink fitting is performed by machining the outer peripheral surface of the roll body so that it has the specified outer diameter, straightness, roundness, and roughness, and the inner surface of the sleeve material also has the specified inner diameter. , Machined to have straightness, roundness, and roughness so as to have a size and shape that can be shrink-fitted to the outer peripheral surface of the roll body, and then the sleeve material is in a degree that does not cause undesired deterioration. In a state of being heated to a lower suitable temperature and thermally expanded, it is fitted to the outer peripheral surface of the roll body through various steps of loose insertion, and the above-described high-precision machining and sleeve material are preferably used throughout. This is because a great deal of effort by skilled workers is required to keep the clearance for fitting while maintaining a high temperature.

In addition, when the sleeve material is a soft metal such as copper, there is also a problem that the diameter of the sleeve material gradually increases while the sleeve material is used, and the fitting force to the roll body portion is reduced at an early stage. there were.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has been made in view of the above-mentioned problems, and has been developed in view of a composite cylinder having a structure in which a sleeve material is fitted to a core material such as a roll body like a conductor roll. A method of manufacturing a composite cylinder / column which can easily produce a cylinder and can further increase the mechanical joining strength and conductivity between the core material and the sleeve material in the manufactured composite cylinder / column as compared with the conventional method. The task is to provide

[0006]

SUMMARY OF THE INVENTION The present invention relates to the manufacture of a composite cylinder / column having a structure in which a cylindrical metal sleeve is concentrically compounded with a cylindrical metal or cylindrical metal core material. A method of brazing the two is adopted, and as the brazing method, the core material and the sleeve material are prepared in a dimensional relationship in view of the brazing material intervening space, and after the core material and the sleeve material are concentrically arranged, they are almost vertically In this state, the lower end of the gap between the core material and the sleeve material is closed and the molten metal can be supplied to the gap, and in this state, one or both of the core material and the sleeve material are replaced with the brazing material. A method in which the gap between the core material and the sleeve material is filled with the molten brazing material while being heated to a temperature equal to or higher than the melting point, and then the whole is cooled to solidify the brazing material and braze the core material and the sleeve material. Which adopts That. With this configuration, the operation of fitting the core material and the sleeve material is much easier than the conventional shrink fitting due to the presence of the gap between the brazing material intervening spaces. The molten metal can be satisfactorily supplied between the core material and the sleeve material without being solidified on the way.Bubble and impurities in the brazing material are automatically levitated and discharged from the upper end, and the molten material is formed between the core material and the sleeve material. Can be satisfactorily joined with a brazing material having few bubbles and impurities. Thus,
Since the obtained composite cylinder / columnar body is well brazed to the core material and the sleeve material, the mechanical bonding strength between the core material and the sleeve material is large, and can be used stably for a long time.
Also, the conductivity between the core material and the sleeve material is excellent.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A composite cylinder / cylindrical body to be manufactured in the present invention has a concentrically composite shape of a cylindrical or cylindrical metal core material and a cylindrical metal sleeve material. If so, its structure, application, and the like are arbitrary. For example, various rolls in which a sleeve material is arranged on the outer periphery of a roll body, various shafts in which a sleeve material is arranged on the outer periphery of a shaft body, and the like can be given. In particular, the composite cylinder / columnar body manufactured according to the present invention has excellent conductivity between the core material and the sleeve material, and thus is suitable for applications requiring electrical conduction such as a conductor roll. Also, the material and shape of the metal core material and the metal sleeve material constituting the composite cylinder / column are not particularly limited, and may be appropriately determined according to the use of the composite cylinder / column. Further, the metal core is not limited to a newly manufactured one, and an existing one may be used. For example, in repairing an existing roll with a sleeve, the roll body after removing the worn or damaged sleeve material is used as a core material, and a newly manufactured sleeve material is arranged thereon to repair the roll with a sleeve. In this case, the present invention can be applied. Hereinafter, an embodiment of the present invention will be described by taking, as an example, the case of manufacturing a composite cylinder having a hollow cylindrical core made of steel and a sleeve made of copper, which is used as a body of a conductor roll.

FIG. 1 and FIG. 2 show an embodiment of the present invention. First, as shown in FIG. 1A, a steel core material 1 and a copper sleeve material 2 are prepared, and the outer peripheral surface of the core material 1 and the inner peripheral surface of the sleeve material 2 have predetermined dimensions, straightness, Roundness,
Machine to the roughness. The machining accuracy at this time is
It may be lower than the processing accuracy when shrink-fitting is performed in the production of a conventional conductor roll, so that the number of machining steps can be significantly reduced. The outer diameter of the core member 1 and the inner diameter of the sleeve member 2 are adjusted so that when both are arranged concentrically at normal temperature, an appropriate gap is formed between them so that the two members can be filled with brazing material and brazed. Set. The dimensions of the gap between the core material and the sleeve material in the concentric arrangement state are such that the molten metal is easily supplied so that the molten metal can be supplied into the gap and the gap can be reliably filled, and the molten metal filled with the gap is filled. The thickness is preferably set to 0.5 mm or more from the viewpoint of facilitating the floating of bubbles and impurities therein, and is preferably 2 mm or less from the viewpoint of reducing the amount of brazing filler metal used.

Next, the core member 1 and the sleeve member 2 are arranged concentrically. Prior to this, one of the outer peripheral surface of the core member 1 and the inner peripheral surface of the sleeve member 2 as shown in FIG. Alternatively, it is desirable that a brazing material plating layer 3 be formed by applying a brazing material molten metal or performing a re-melting process after spraying the brazing material. The plating of the brazing material may be performed using a flux. Here, the main purpose of forming the plating layer is to improve the bondability between the brazing material and the core material 1 and the brazing material and the sleeve material 2 when the core material 1 and the sleeve material 2 are brazed. It is also useful for facilitating the flow of the molten metal when supplying the molten metal between the sleeve material 1 and the sleeve material 2. The thickness of the plating layer may be very thin (for example, 50 to 200 μm) corresponding to the above purpose. In addition, core material 1
When the material of the sleeve material 2 is excellent in the wettability to the molten brazing material, or when the flux is applied to the surface of the core material 1 or the sleeve material 2 at the time of brazing, the wettability of the brazing material can be improved. For example, the plating layer of the brazing material 3 may be omitted.

Next, as shown in FIG. 1C, the core material 1 and the sleeve material 2 are fitted and concentrically arranged. Here, when the brazing material 3 is plated on the core material 1 and the sleeve material 2 and the total thickness is selected to be thick (for example, 300 to 500 μm), the brazing material 3 is used to facilitate the fitting operation. Shrink-fit at a temperature below the melting point of This shrink fitting is much easier than in the case where a core material (roll body) and a sleeve material are directly shrink-fitted and joined in the production of a conventional conductor roll. That is, in the shrink fitting in the present embodiment, it is only necessary to fit the core material 1 and the sleeve material 2 through the plating layer of the brazing material 3, and it is not necessary to firmly join the core material 1 and the sleeve material 2. Even if the temperature is not raised to the normal shrink fitting temperature to enlarge the gap, the plating layer of the brazing material 3 is soft and plays a role of a lubricant, so that the shrink fitting can be easily performed. Further, by shrink fitting, the core material 1 and the sleeve material 2 can be arranged concentrically.

When the plating layer of the brazing material 3 formed on the core material 1 and the sleeve material 2 is thin, it can be accurately concentrically arranged simply by fitting the core material 1 and the sleeve material 2 together. However, the two need to be concentrically arranged in an appropriate manner. As a method of the concentric arrangement, for example, a method of arranging stepping stones in the circumferential direction in a form in which a plurality of embedding spacers having a constant thickness acts in the axial direction in the gap between the core material 1 and the sleeve material 2. The core material 1 and the sleeve material 2 can be easily and concentrically held by using the buried spacer. Specific examples of the embedding spacer include a form in which metal wires are arranged at about four locations in the circumferential direction, and a form in which L-shaped metal plate sections are arranged at both ends. When the filler spacer is filled with brazing material between the core material 1 and the sleeve material 2 and brazed, the buried spacer is kept buried as it is. Metallic ones are suitable. As a method of arranging the buried spacer, a method of mechanically attaching the buried spacer to the core material 1 or the sleeve material 2 before plating the brazing material, or a method of attaching the core material 1 and the sleeve material 2 on which the plated layer is formed. At the time of fitting or after the fitting, a method of inserting a buried spacer between them can be cited.

Next, as shown in FIG. 2, the fitting body of the core material 1 and the sleeve material 2 is erected substantially vertically and is held on the support base 5. The support 5 used here is provided with a plurality of passages 7 that are vertically spaced therefrom and communicate with the gap 6 between the core material 1 and the sleeve material 2 at appropriate intervals in the circumferential direction. In a region other than the passage 7, a lower end of the gap 6 is closed, and a mechanism (not shown) for sealing so that the molten metal in the gap 6 does not leak to the surroundings is provided. The support 5 has a bracket 14 to which a fixing jig 10 having a holding plate 11, a connecting rod 12, a spring 13 and the like for fixing the core material 1 and the sleeve material 2 to the support 5 is provided. ing. Although one set of the fixing jig 10 is shown in the drawing,
A plurality of fixing jigs 10 are arranged around the support base 5.
A distribution pipe 16 is provided in the passage 7 formed in the support base 5.
The molten metal bath 18 containing the molten metal of the brazing material 3 is connected to the pipe 16 by a pipe 19. The height of the molten metal bath 18 can be adjusted, and the molten metal can be supplied to the gap 6 from the lower end thereof by the head by adjusting the height appropriately. The height of the molten metal surface of the molten metal bath 18 is set at a position slightly higher than the upper end of the gap 6. By adopting this height, the gap 6 is filled with the molten metal by the molten metal head of the molten metal bath 18, and the scum on the upper surface of the molten metal can be discharged by slightly pushing the molten metal from its upper end. The height of the molten metal surface of the molten metal bath 18 is not a fixed position as in the above example, and may be changed in accordance with the rise of the molten metal surface in the gap 6 when the molten metal is injected into the gap 6. By doing so, it becomes easy to make the injection speed of the molten metal constant.

As shown in FIG. 2, a core 1 and a sleeve 2
Can be held upright on the support table 5 so that the lower end of the gap 6 other than the area facing the passage 7 is closed, and the molten metal from the molten metal bath 16 can be supplied to the gap 6 by the passage 7. After the state, the whole is put into a heating furnace, and the temperature in the heating furnace is set to a temperature slightly higher than the melting point of the brazing material (for example,
(Melting point + about 50 ° C.). This allows
The core material 1 and the sleeve material 2 are heated, and the plating layer of the brazing material 3 between them is heated and melted. When the plating layer is thick, a part thereof flows down to fill the lower portion of the gap 6. At the same time, the brazing filler metal is supplied from the molten metal bath 16 and reliably fills the gap 6 and is slightly pushed out from the upper end of the gap 6 to push the scum out of the gap. At this time, since the gap 6 is arranged vertically, bubbles and impurities in the molten metal that fill the gap 6 automatically rise and are discharged out of the system from the upper end. Thereafter, the temperature in the furnace is lowered to lower the fitting body together with the brazing material 3 in the gap 6 to a temperature lower than the melting point of the brazing material,
The brazing material 3 is solidified to obtain a brazing body. After the brazing body has been lowered to a temperature at which it can be easily handled (for example, around 150 ° C.), the whole is taken out of the furnace and allowed to cool. Prior to the concentric arrangement of the core material 1 and the sleeve material 2, by applying a flux to the surfaces to be brazed, the molten metal in the gap surely wets the surfaces to be brazed. As a result, good brazing can be performed. In particular, when a plating layer is not applied before the concentric arrangement, application of a flux is particularly desirable. At this time, as described above, the gap between the core material and the sleeve material is set to be large as described above, so that the rising and discharging of the flux proceeds without fail.

As described above, the core 1 and the sleeve 2 are
A composite cylinder in which the core material 1 and the sleeve material 2 are brazed by a brazing material layer having few bubbles and impurities is manufactured. In the obtained composite cylinder, the core material 1 and the sleeve material 2
Are soldered by a brazing material layer having few air bubbles and impurities, so that the bonding strength between the core material 1 and the sleeve material 2 is large, and the current-carrying resistance between the two is uniform and extremely small, so that excellent conductivity is exhibited. I do. Thus, a composite cylinder that is very effective for use as a conductor roll can be obtained.

In performing the above brazing operation, the atmosphere in the heating furnace used may be a normal atmosphere (an atmosphere in which a normal atmosphere exists), but is preferably an oxygen-free atmosphere. By using an oxygen-free atmosphere, oxidation of the brazing material plating layer can be prevented, and a higher quality brazing structure can be obtained. In particular, when the plating layer is not applied before the concentric arrangement, it is particularly desirable to set the atmosphere to a non-oxidizing atmosphere. The casting of the brazing material between the core material 1 and the sleeve material 2
Usually, this is performed under normal pressure. However, if necessary, the pressure in the heating furnace is reduced, or a negative pressure is applied only to the upper end of the gap 6 between the core material 1 and the sleeve material 2 to reduce the casting pressure. You may go in. When the casting is performed under reduced pressure, escape of bubbles from the brazing filler metal in the gap 6 can be further facilitated, and high-quality brazing can be quickly performed. Also,
When the negative pressure acts only on the upper end of the gap 6, the supply of the molten metal from the lower end of the gap 6 can be performed promptly. Further, by applying vibration to the object at the time of casting, escape of bubbles can be promoted. In particular, ultrasonic vibration is effective. In particular, injection of the brazing filler metal
When performing the upper pouring method instead of the lower pouring method as shown in FIG. 2, the above-described reduced pressure is particularly useful.

In the above-described embodiment, in order to replenish the molten brazing filler metal into the gap 6, a molten metal bath 18 is connected to the lower end of the gap 6, and the molten metal is replenished into the gap 6 by a molten metal head. However, the present invention is not limited to this configuration, and may be configured to replenish the molten metal from the upper end of the gap 6. However, if the configuration is such that the molten metal is replenished from the lower end of the gap 6 by the head as shown in the embodiment, there is an advantage that the molten metal can be stably and reliably replenished into the gap 6. In the above-described embodiment, the core member 1 and the sleeve member 2 in the fitted state are used.
Is heated in a furnace, but the heating method is not limited to furnace heating, and other methods, for example, induction heating, heating by a burner, or the like may be used. However, adopting a method of heating in a furnace has the advantage that the work is easy and uniform heating is possible as a whole.

[0017]

As described above, according to the present invention, a metal core material and a metal sleeve material are prepared in a dimensional relationship in consideration of a brazing material intervening space, and the core material and the sleeve material are concentric. After the arrangement, the holder is held in a substantially vertical state, and the lower end of the gap between the core material and the sleeve material is closed, and the molten filler metal can be supplied to the gap. Or by filling the space between the core material and the sleeve material with the brazing material molten metal in a state where both are heated, and then cooling the whole to solidify the brazing material and braze the core material and the sleeve material. , The core material and the sleeve material can be satisfactorily joined with a brazing material to produce composite cylinders and cylinders with high mechanical joining strength and excellent electrical conductivity. Can be implemented at a known low cost Because it is a technique, after all, it has the effect of producing a composite cylindrical-cylindrical body at low cost. In addition, the composite cylinder / columnar body manufactured by the present invention can be used stably for a long period of time because the core material and the sleeve material are well brazed and have high mechanical bonding strength. Since it has excellent conductivity with the sleeve material, it is extremely suitable for applications in which a large current flows, such as a conductor roll.

[Brief description of the drawings]

FIGS. 1A, 1B, and 1C are schematic cross-sectional views illustrating steps of an embodiment of the present invention.

FIG. 2 is a schematic sectional view showing a state in which a brazing material is melted and solidified.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core material 2 Sleeve material 3 Brazing material 5 Support base 6 Gap 7 Passage 10 Fixing jig 11 Holding plate 12 Connecting rod 13 Spring 16 minute piping 18 Melting bath

Continuation of the front page (72) Inventor Fumiaki Tada 2-17-8 Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Within Dai-ichi High Frequency Industry Co., Ltd. (72) Michio Tanabe 2--17-8 Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture No. Daiichi High Frequency Industry Co., Ltd.

Claims (7)

[Claims] 1. A method for producing a composite cylinder / column body in which a cylindrical or cylindrical metal core material and a cylindrical metal sleeve material are brazed to each other, wherein the core material and the sleeve material are brazed. The core material and the sleeve material are prepared in a dimensional relationship that allows for the space between the core material and the core material and the sleeve material. In a state where the molten metal can be supplied, one or both of the core material and the sleeve material are heated to a temperature equal to or higher than the melting point of the brazing material, and the gap between the core material and the sleeve material is filled with the molten brazing material. And then cooling the whole to solidify the brazing material and brazing the core material and the sleeve material to produce a composite cylinder / column. 2. The plating method according to claim 1, wherein prior to the concentric arrangement of the core material and the sleeve material, a brazing material plating layer is formed on one or both of the outer peripheral surface of the core material and the inner peripheral surface of the sleeve material. A method of manufacturing composite cylinders and cylinders. 3. The method according to claim 1, wherein the heating of the sleeve or the like to a temperature higher than the melting point of the brazing material is performed by placing the whole in a furnace. 4. The size of the gap between the core material and the sleeve material in the concentric arrangement state is set to 0.5 mm or more to facilitate floating of bubbles and impurities in the brazing filler metal filling the gap. The method for producing a composite cylinder / column according to claim 1, 2 or 3. 5. The method according to claim 1, wherein said concentric arrangement is facilitated by burying said spacer in said gap and arranging stepping stones in a circumferential direction. 6. The casting of the brazing material is performed under reduced pressure,
The composite cylinder according to any one of claims 1 to 5, which facilitates escape of bubbles from the brazing filler metal filling the gap.
Manufacturing method of cylindrical body. 7. The supply of the brazing filler metal to the gap between the core material and the sleeve material is performed by connecting a molten metal bath containing the molten metal to the lower end of the gap and lowering the molten metal surface of the molten metal bath into the gap. The method for producing a composite cylinder / column according to any one of claims 1 to 6, wherein the method is performed by a head of the molten metal formed at a position higher than the surface of the molten metal.