JP2002301567A - Method for producing complexed cylindrical or columnar body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for easily producing a complexed cylindrical or columnar body which is excellent in mechanical joined strength and electrical conductivity of a core material and a sleeve material, and has a constitution where the metal-made sleeve material is complexed to the cylindrical or colum nar metal-made core material concentrically. SOLUTION: The core material 1 and the sleeve material 2 are prepared with a dimensional relation so as to interpose a brazing material therebetween, and the brazing material 3 is plated to one or both of the circumferential surface of the core material and the inner peripheral surface of the sleeve material, and the sleeve material 2 is shrinkage-fitted to the core material 1. Thereafter, an operation of heating, melting and successively, solidifying the brazing material 3 between the core material 1 and the sleeve material 2 is performed in the form of progressing from the lower part to the upper part in order, and the core material and the sleeve material are brazed while automatically shifting upward gas bubble and impurity in the brazing material to produce the complexed cylindrical or columnar body excellent in the mechanical joined strength and the 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 Hereinafter, a conductor roll for supplying a cathode to a thin metal plate to be plated in an electroplating line will be described as an example. The conductor roll is
Since the roll body, which is the end of the rolling contact with the thin metal plate, is severely degraded and worn, and requires frequent repairs, rolls with sleeves that can be repaired at low cost by replacing the sleeve material are often used. In a conductor roll with a sleeve, since a large current of several thousand amps flows across the core-sleeve material 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 as to have a predetermined outer diameter, straightness, roundness, and roughness, and also the inner peripheral surface of the sleeve material by a predetermined amount. Machined to the inner diameter, straightness, roundness, and roughness, and precisely adjusted to the size and shape that can be shrink-fitted to the outer peripheral surface of the roll body. The sleeve material is fitted to the outer circumferential surface of the roll body through various steps of loose insertion in a state where the sleeve material is heated to a suitable temperature as low as possible and thermally expanded, and the high-precision machining and the sleeve are performed. This is because a great number of man-hours and effort by skilled workers are required to keep the material in a suitable temperature-rising state and to keep the clearance for fitting.

Further, when the sleeve material is a soft metal such as copper, there is a problem that, while the sleeve material is used as a roll, the diameter of the sleeve material gradually expands and the fitting force to the roll body is reduced at an early stage. There was also.

[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 and concentrically arranged in a dimensional relationship that allows for the brazing material intervening space, and the brazing material is placed in the gap between the two materials. In this method, the brazing material is cast in such a manner that the replenishment of the molten material and the subsequent solidification are sequentially advanced from below to above. With this configuration, the operation of concentrically arranging the sleeve material on the outside of the core material is much easier than the conventional shrink fitting due to the existence of the gap corresponding to the brazing material intervening space. In brazing, the replenishment of the brazing filler metal and the subsequent solidification are sequentially advanced from below to above, so that air bubbles and impurities in the brazing filler material float up in the brazing filler metal melt and have low porosity in the melt. The solidification of the molten metal proceeds as the process proceeds, and as a result, the solidification of the melt proceeds. As a result, the core material and the sleeve material can be satisfactorily joined with low-porosity and clean brazing material. In the composite cylinder / column thus obtained, the core material and the sleeve material are satisfactorily brazed to each other, so that the mechanical joining strength between the core material and the sleeve material is large, and the composite material can be used stably for a long period of time. It is also excellent in conductivity between the core material and the sleeve material.

[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.

As described above, according to the present invention, when the core material and the sleeve material are brazed, the core material and the sleeve material are prepared and arranged concentrically in consideration of the brazing material intervening space. In the gap, the brazing is performed by pouring the brazing filler metal in such a manner that the replenishment of the brazing filler metal and the subsequent solidification are sequentially advanced from below to above. In carrying out this method, various methods can be adopted for replenishment of the brazing filler metal melt. The typical ones are shown below.

FIG. 1 and FIG. 2 show a first 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, Machine to achieve roundness and roughness. The processing accuracy at this time may be lower than the processing accuracy when shrink fitting is performed in the production of a conventional conductor roll, and therefore, 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 size of the gap between the core material and the sleeve material in the concentric arrangement state is preferably set to 0.5 mm or more from the viewpoint of facilitating the floating of bubbles and impurities in the brazing filler metal replenished in the gap. 2m from the point of reducing the amount of brazing material used
m or less.

Next, as shown in FIG. 1B, a brazing material 3 is plated or sprayed on the inner peripheral surface of the sleeve material 2. In the case of plating, the sleeve material 2 may be rotated and flux may be used, and the thermal spraying may be performed by spraying a brazing material, or a wire of the A component and a wire of the B component of the brazing material. May be used to perform arc spraying to form a pseudo-alloy brazing material layer. Further, the sprayed layer may be subjected to a remelting treatment in the presence of a flux. It is desirable that the amount of adhesion of the plating layer and the like is set to be substantially equal to a gap generated between the core material and the sleeve material when the core material and the sleeve material are concentrically arranged (the compensation for the insufficient amount of adhesion will be described later). Instead of plating or spraying the brazing material 3 on the inner peripheral surface of the sleeve 2, a plating layer or a sprayed layer of the brazing material may be applied on the outer peripheral surface of the core material 1, or the outer peripheral surface of the core material 1 and the sleeve. A plating layer of a brazing material or a sprayed layer may be applied to both the inner peripheral surfaces of the material 2. When the core material 1 is made of a material such as a steel material, which is not particularly easy to braze, a plating layer (or a thermal spraying / remelting treatment layer) of the brazing material is thinned on the outer peripheral surface of the core material 1. It is also useful to form a thick layer on the inner peripheral surface of the sleeve material 2 with the brazing material sprayed as it is.

Next, as shown in FIG. 1 (c), the core material 1 and the sleeve material 2 are shrink-fitted at a temperature lower than the melting point of the brazing material 3. 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 too high, a gap required for the fitting operation can be sufficiently formed between the brazing material 3 around the core material 1 and the plating layer of the brazing material 3 is soft and plays a role of a lubricant. Easy shrink fit.

Next, as shown in FIG. 2, the core member 1 and the sleeve member 2 in the fitted state are erected substantially vertically and held on the support base 5. At this time, the core member 1 and the sleeve member 2 are pressed against the support base 5 by appropriate means (not shown) so that the melted brazing material does not leak from the lower end of the gap between the core member 1 and the sleeve member 2. And an appropriate sealing material is arranged.
In this state, the induction coil 7 is passed through the core 1, and the induction coil 7 is raised while the core 1 is induction-heated from the lower end to the melting temperature of the brazing material 3 or higher. This allows
The brazing material 3 melts from the lower end portion, and the melting position rises, and the previously melted portion solidifies. That is, the replenishment of the brazing filler metal into the gap between the core material 1 and the sleeve material 2 and the subsequent solidification proceed sequentially from below to above. In this way, the replenishment of the brazing filler metal and the subsequent solidification proceed sequentially from below to above, whereby bubbles and impurities in the molten metal automatically rise, and the solidification with the core material 1 by the subsequent solidification. The sleeve material 2 is soldered. Here, the time from the replenishment of the molten metal to the solidification is preferably long from the removal of air bubbles and impurities, but the brazing material 3 and the core material 1,
From the viewpoint of preventing the development of the alloy layer with the sleeve material 2, the shorter the better, the better. By performing the above-mentioned melting and solidifying operations up to the upper ends of the core material 1 and the sleeve material 2, the core material 1 and the sleeve material 2 are brazed by a brazing material layer free of bubbles and impurities. In this melting and solidifying operation, the core material 1
If the brazing material 3 between the sleeve material 2 and the sleeve material 2 is insufficient, the molten brazing material may be supplied from the upper end. Further, when the operation of sequentially starting the melting operation from the middle height of the shrink-fitting body is repeated twice with the fitting body turned upside down, the sealing treatment of the lower end portion can be omitted.

As described above, a composite cylinder in which the core material 1 and the sleeve material 2 are brazed is manufactured. In the obtained composite cylinder, the core material 1 and the sleeve material 2 are brazed by a brazing material layer free of 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 them is large. Are uniform and extremely small, and exhibit excellent conductivity. Thus, a composite cylinder that is very effective for use as a conductor roll can be obtained.

In the above-described embodiment, the induction coil 7 is inserted inside the core material 1 so that the core material 1 or the core material 1 is inserted.
And the sleeve material 2 are induction heated, and the brazing material 3 is melted by the heat. The induction coil is arranged outside the sleeve material 2 to induce the sleeve material 2 or the sleeve material 2 and the core material 1. It may be configured to heat. Further, the heating method for melting the brazing material is not limited to induction heating, other methods, for example,
Although heating by a burner may be used, it is preferable to employ induction heating because an advantage that a desired region can be quickly and easily heated to a desired temperature is obtained.

Next, a second embodiment of the present invention will be described. As in the case shown in FIG. 1A, first, a core material 1 and a 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, and circularity. Machine to obtain the degree and roughness. The outer diameter of the core material 1 and the inner diameter of the sleeve material 2 are set such that when they are arranged concentrically, an appropriate gap is created between them so that the brazing material can be filled and brazed. The size of the gap is 0.5 mm or more from the viewpoint of enabling the molten brazing material to be poured into the gap and uniformly filling the gap and facilitating the floating of bubbles and impurities in the molten brazing metal supplied into the gap. Is preferable, and from the viewpoint of reducing the amount of brazing material used, 2 is set.
mm or less.

Next, a plating layer (or a sprayed / remelted layer) of a brazing material is applied to the outer peripheral surface of the core material 1 and the inner peripheral surface of the sleeve material 2. The plating layer or the like of the brazing material formed here is the core material 1
It serves as a primer when brazing the sleeve material 2 to the sleeve material 2 and may be extremely thin.

Next, as shown in FIG. 3, the core material 1 and the sleeve material 2 are arranged concentrically, and the lower end of the gap 10 between the core material 1 and the sleeve material 2 is closed by the support base 11. , Tilt the whole. Here, in order to arrange the core material 1 and the sleeve material 2 concentrically, the core material 1 and the sleeve material 2 may be held by separate holding members so that they are concentric. It is preferable that a plurality of embedding spacers (not shown) having a constant thickness are arranged in the gap between the core material 1 and the sleeve material 2 in the circumferential direction so as to act in the axial direction. As a specific form, a form in which metal wires are arranged at four positions in the circumferential direction over the entire length, or a form in which L-shaped metal plate sections are arranged at both ends can be exemplified. By using this buried spacer, the core material 1 and the sleeve material 2 can be easily and concentrically held. The buried spacer is core material 1
When the brazing material is filled and brazed between the sleeve material 2 and
It is to be left buried as it is, and a copper-based metal that is easily brazed itself is suitable.

Next, a gap 1 between the core 1 and the sleeve 2
The molten metal of the brazing material 3 is supplied into the gap 10 from the lower region at the upper end of the zero. As a result, the supplied molten metal flows down with the valley bottom side inside the sleeve material 2 as a runner, and fills the gap 10 between the core material 1 and the sleeve material 2 from the lower end portion.
At this time, the core material 1 and / or the sleeve material 2 are locally heated so that the runner through which the molten metal flows and the portion where the molten metal newly flows are maintained at a temperature equal to or higher than the melting point of the brazing material. For this heating, a known method such as induction heating or burner heating may be appropriately used. On the other hand, the temperature of the region previously filled with the molten metal is lowered by cooling, and the molten metal in that portion solidifies. Thus, the gap 10 between the core material 1 and the sleeve material 2 is replenished with the molten metal from the lower end thereof, the molten metal replenishment region gradually rises, and solidification gradually proceeds from the lower end. That is, the brazing material is cast into the gap between the core material 1 and the sleeve material 2 in such a manner that the replenishment of the brazing metal melt and the subsequent solidification are sequentially advanced from below to above, and brazing is performed. As described above, the refilling of the brazing filler metal and the subsequent solidification proceed sequentially from below to above, whereby bubbles and impurities in the molten metal automatically rise, and the core material 1 and the sleeve material are solidified by the subsequent solidification. 2 is brazed.

Then, as shown in FIG.
After the molten metal is filled into the gap 10 between the sleeve material 2 and the molten metal up to the molten metal injection position, the molten metal is further injected from the upper end of the gap 10 while raising the core material 1 and the sleeve material 2 to a vertical state. , Coagulate. By the above operation, the core material 1 and the sleeve material 2 are brazed by the brazing material layer with few bubbles and impurities, and the core material 1 and the sleeve material 2
A brazed composite cylinder is produced. In the obtained composite cylindrical body, since the core material 1 and the sleeve material 2 are brazed by a brazing material layer containing few air bubbles and impurities, the bonding strength between the core material 1 and the sleeve material 2 is large, and the current-carrying resistance between them is large. Are uniform and extremely small, and exhibit excellent conductivity. Thus, it is very effective for use as a conductor roll. In this embodiment, the time from the replenishment of the molten metal to the solidification is preferably set within about 30 minutes as in the first embodiment.

In the above-described embodiment, as shown in FIG. 3, the brazing filler metal is poured while the core material 1 and the sleeve material 2 are inclined, but instead the core material 1 and the sleeve material 2 are started. The molten metal may be poured from the upper end in a vertical state. However, as shown in the embodiment, when the inclined state is maintained, a plurality of runners through which the molten metal flows are not formed, and thus the core material 1 and the sleeve material 2 are not formed.
The advantage is that the molten metal can be satisfactorily fed into the entire narrow gap between them.

Further, the injection of the brazing filler metal is not limited to the case where the injection is performed from the upper end of the gap between the core material 1 and the sleeve member 2, and the injection may be performed from the lower end. FIG. 4 shows an embodiment in that case. In this embodiment, a support base 15 for vertically holding the core material 1 and the sleeve material 2 in a concentrically arranged state.
And a support 15 having a passage 18 extending from the melt bath 16 to the gap 10 between the core 1 and the sleeve 2 placed on the support 15.
Are provided at appropriate intervals in the circumferential direction, and pneumatic pressure can be applied to the upper surface of the molten metal bath 16. Then, the core member 1 and the sleeve member 2 which are concentrically arranged are attached to the support base 15 such that the lower end of the gap 10 between the two communicates with the passage 18 and the brazing material does not leak from other portions. In this state, air pressure is applied to the upper surface of the molten metal bath 16 to push up the molten metal from the lower end of the gap 10. At this time, the core material 1 and the sleeve material 2 are preheated so that the molten metal supplied to the gap 10 does not immediately solidify. After the gap 10 is filled with the molten metal, cooling is performed from the lower end to solidify the molten metal. According to this method as well, the brazing material can be solidified while raising bubbles and impurities in the molten metal, and the core material 1 and the sleeve material 2 can be satisfactorily brazed.

In each of the embodiments described above, prior to the concentric arrangement of the core material 1 and the sleeve material 2, when a plating layer or the like is applied to the surface to be brazed, a flux is applied thereon. By doing so, the brazing filler metal replenished in the gap becomes a place where the brazing surface is reliably wetted, so that good brazing can be performed. The brazing material is normally cast between the core material 1 and the sleeve material 2 under normal pressure, but if necessary, a negative pressure acts on the upper end of the gap between the core material 1 and the sleeve material 2. May be performed under reduced pressure. When casting is performed under reduced pressure, escape of bubbles from the brazing filler metal in the gap can be further facilitated, and high-quality brazing can be performed promptly. Further, in the embodiment shown in FIG.
By applying a negative pressure to the upper end of the gap, the supply of the molten metal from the lower end of the gap 10 can be performed promptly. In addition, when the object is vibrated at the time of brazing, escape of bubbles can be promoted. In particular, ultrasonic vibration is effective.

[0023]

As described above, according to the present invention, the metal core material and the metal sleeve material are prepared and arranged concentrically in a dimensional relationship that allows for the brazing material intervening space. In the gap, the brazing material is cast in such a manner that the replenishment of the brazing material molten metal and the subsequent solidification are sequentially advanced from below to above, so that the core material and the sleeve material can be satisfactorily joined with the brazing material. However, since composite cylinders and cylinders having high mechanical bonding strength and excellent conductivity can be manufactured, and all the techniques used in the manufacturing process are conventionally known inexpensive techniques, This has the effect that a composite cylinder / column can be manufactured 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 very suitable for an application in which a 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 a first embodiment of the present invention.

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

FIGS. 3A and 3B are schematic cross-sectional views illustrating steps of a second embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view illustrating supply of a molten brazing filler metal according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core material 2 Sleeve material 3 Brazing material 5 Support stand 7 Induction coil 10 Gap 11 Support stand 15 Support stand 16 Molten bath 18 Passage

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B23K 1/20 B23K 1/20 F C25D 7/06 C25D 7/06 K F16C 13/00 F16C 13/00 E // B23K 101: 06 B23K 101: 06 (72) Inventor Ryoji Kobayashi 2-17-8 Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Within the Daiichi Kogyo Kogyo Co., Ltd. (72) Inventor Toshiharu Matsuoka Kawasaki-ku, Kawasaki-shi, Kanagawa 2-17-17 Tonomachi Dai-ichi High Frequency Industry Co., Ltd. (72) Inventor Kiyomi Matsuoka 2-17-8 Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture F-Term in Dai-ichi High Frequency Industry Co., Ltd. 3J103 AA02 AA14 AA24 AA41 EA03 EA06 FA15 GA02 GA52 HA03 HA36 HA38 4K024 CB10

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. Prepared and arranged concentrically in a dimensional relationship that allows for the intervening material space, and in the gap between the two materials, cast the brazing material in such a manner that the replenishment of the brazing material molten metal and subsequent solidification are sequentially advanced from below to above. And producing the composite cylinder / column by performing the brazing. 2. A brazing material plating layer or a thermal sprayed layer is formed on at least one of the outer peripheral surface of the core material and the inner peripheral surface of the sleeve material, and the two materials are shrink-fitted at a temperature equal to or lower than the melting point of the brazing material. The concentric arrangement is performed, and then, the plating layer or the sprayed layer is sequentially subjected to a movable remelting process from below, so that the replenishment of the brazing filler metal and the subsequent solidification proceed in the above-described manner. Item 2. The method for producing a composite cylinder / column according to Item 1. 3. In a state where the core material and the sleeve material are inclined while being concentrically arranged, a brazing filler metal is supplied into a gap between the two materials by using a valley bottom inside the sleeve material as a runner. The replenishment of the brazing filler metal and the subsequent solidification proceed in the above-described manner by proceeding with an operation of maintaining the portion where the molten metal newly spreads and the runner at a temperature equal to or higher than the melting point of the brazing filler metal. 2. The method for producing a composite cylinder / column according to 1. 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 the floating of bubbles and impurities in the brazing filler metal replenished in the gap. A method for producing a composite cylinder / column according to any one of claims 1 to 3. 5. The method according to claim 4, wherein said concentric arrangement is facilitated by burying said spacer in said gap and arranging stepping stones in the 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 refilled in the gap.
Manufacturing method of cylindrical body. 7. The development of an alloy layer between the brazing material, the core material and the sleeve material is suppressed to 30 minutes or less from the replenishment of the molten metal to the solidification during the casting of the brazing material. 7. The method for producing a composite cylinder / column body according to any one of items 1 to 6.