JPH0645074B2 - Roll pressure bonding method for easily seized metal plate - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for rolling and press-bonding easily seized metal sheet materials, more specifically, a method in which a plurality of metal sheet materials are superposed and at least one side sheet material that is in contact with the rolling roll is A method of rolling and crimping a metal plate material, which allows a plurality of metal plate materials to be integrally crimped by cold rolling a stack made of a metal material that is easily bakeable by a rolling roll Is.

(Prior Art) Conventionally, a cold rolling method has been known as one of methods for producing a clad material formed by integrally joining a plurality of metal plate materials. And in this cold rolling method, in general, (a)
A pretreatment step of cleaning the mating surfaces of a plurality of metal plate materials by wire brush polishing or the like, and (b) overlaying the metal plate materials subjected to the pretreatment step on the mating surfaces, Crimping and rolling step of cold rolling with a rolling roll to mechanically and integrally crimp it, and (c) Predetermined with respect to the superposed product (clad material) of metal sheet materials integrally crimped in the crimping and rolling step. The predetermined clad material is manufactured through a diffusion heating step of performing the diffusion heating (diffusion annealing) of the above, and metallurgically joining the metal plate materials.

By the way, in such a cold rolling method, in order to mechanically integrally press-bond a metal plate material constituting a laminated product with a rolling roll, at least about 30%, generally about 40% or more is severe in one pass. A large reduction rate is required. Therefore, in such cold rolling, it is desirable to lubricate the contact surface between the rolling roll and the metal plate material in order to prevent seizure between the rolling roll and the metal plate material in contact with the rolling roll.
However, in such cold rolling, when a large amount of fluid lubricating oil such as that used in conventional cold rolling is supplied between the rolls, the lubricating oil penetrates between the mating surfaces of the metal plate materials,
This causes a problem that the pressure bonding of the metal plate materials is hindered.

For this reason, conventionally, during such cold rolling, a lubricant which is almost solid, such as animal fats and oils and solid soap, is applied to the roll surface of the rolling roll in small amounts. According to such a lubrication method, the lubricant does not penetrate between the mating surfaces of the metal plate materials, and therefore the pressure bonding of the metal plate materials is not obstructed by the lubricant.

(Problem) However, in such a lubrication method, it is unavoidable that the lubrication performance becomes insufficient at the contact surface between the rolling roll and the metal plate in contact with the rolling roll. Therefore, the metal plate in contact with the rolling roll has excellent lubricity. Although it is not so problematic when it is made of a hard-to-seize metal material, the metal plate material in contact with the rolling roll is apt to cause seizure such as nickel alloy such as nickel stainless steel or pure nickel, or aluminum or its alloy. In the case of using a metal material that is easily seized, there is a problem that seizure occurs on the contact surface between the rolling roll and the metal plate material.

Then, when seizure occurs, in order to remove the flaws formed on the metal plate material, it is necessary to deeply polish the metal plate material, and in order to correct the seizure generated on the roll surface of the rolling roll. However, it is necessary to re-polish the roll surface of the rolling roll one by one, and therefore, there is a problem that the production cost of the clad material produced through the cold rolling step (compression rolling step) becomes extremely high.

Incidentally, in order to avoid such seizure, it suffices to reduce the rolling reduction of the rolling roll during such cold rolling, but in this case, since the pressure bonding between the metal plate materials becomes insufficient, It is not desirable.

(Solution) The present invention has been made in view of such circumstances, and the gist thereof is to superimpose a plurality of metal plate materials and to contact at least one side of the rolling roll. When a laminated material in which the plate material is made of an easily burnable metal material is cold-rolled by a rolling roll, the plurality of metal plate materials are integrally pressure-bonded to each other. As the plate material to be formed, a plate material is used in which a metal layer made of copper or zinc having a predetermined thickness is formed on at least the surface in contact with the rolling roll.

Here, the thickness of the metal layer of copper or zinc varies depending on the rolling conditions such as the rolling reduction, but when the maximum rolling reduction is about 50%, it is set to 1 μm or more, preferably about 2 to 3 μm. It is desirable to do.

The metal layer of copper or zinc (copper / zinc metal layer) can be formed by an appropriate method, but generally it is formed by plating or vapor deposition.

Further, although it is sufficient to form the copper / zinc metal layer only on the surface of the metal plate material that contacts the rolling roll, as in the case of forming the copper / zinc metal layer by plating,
When it is easier to form the copper / zinc metal layer on both sides of the metal plate material, it is also possible to form the copper / zinc metal layer on both sides of the metal plate material.

The copper / zinc metal layer formed on the mating surface side of the metal plate is
Usually, in the pretreatment process executed before the pressure-bonding rolling process, most of the metal is removed by wire brush polishing, etc., so that the presence of such a metal layer causes a significant decrease in the pressure-bonding strength between metal plate materials. Therefore, even if the copper / zinc metal layers are formed on both sides of the metal plate, there is no problem in practical use. However,
When zinc is used as the metal layer, since zinc is a low melting point material, the zinc on the mating surface side is used in order to prevent the pressure bonding strength between the metal plate materials from being significantly reduced due to the presence of the zinc metal layer. It is necessary to remove the metal layer sufficiently.

In addition, in the case where the easy-baking metal plate material is superposed on the metal plate material made of high-carbon steel at the mating surface, in the diffusion heating step, the carbon in the high-carbon steel is converted into the easy-baking metal plate material. In order to prevent the diffusion, it is desirable to positively form a copper metal layer on the mating surface side of the easily seized metal plate material.

Further, as the superposed product which is rolled and pressure-bonded according to the present invention, a product in which about two or three metal plate materials are superposed is usually adopted. As the superposed product, four or more sheets are used. It does not matter even if the metal plate materials are laminated.

(Operation / Effect) According to the present invention, the easily seizeable metal sheet made of nickel alloy such as nickel stainless steel or pure nickel, or aluminum or alloy thereof has lubricity on the surface in contact with the rolling roll. It is coated with a copper / zinc metal layer that is a good flame-retardant material, and at the time of rolling and pressure bonding by a rolling roll, it can be brought into contact with the rolling roll through the metal layer. It is possible to satisfactorily avoid the occurrence of seizure on the contact surface between the rolling roll and the easily seized metal plate material.

Therefore, unlike the conventional method, it is possible to satisfactorily prevent the occurrence of flaws on the easily seized metal plate material due to seizure, and it is not necessary to perform deep polishing to remove such seizure flaws. . Moreover, it is not necessary to frequently re-polish the roll surface in order to correct the seizure of the roll surface of the rolling roll. Therefore, as compared with the case where the conventional method is adopted, the production cost of the clad material produced through the pressure-bonding rolling step can be significantly reduced.

Incidentally, when crimping a plurality of metal plate materials according to the present invention, usually, with respect to the roll surface of the rolling roll,
Similar to the conventional method, solid lubricants are applied in small amounts, but copper and zinc have a lubricating ability by nature, so if the rolling reduction is about 40% or less, it is not always so. It is not necessary to apply a proper lubricant.

Further, the copper / zinc metal layer formed on the surface of the easily-bakable metal sheet material that comes into contact with the rolling roll is usually polished and removed after the rolling and pressure bonding operation according to the present invention, but such a metal layer is sufficiently thin, Since it can be easily removed by polishing using a wire brush or ordinary abrasive grains, such polishing does not significantly increase the manufacturing cost of the clad material. The removal of the copper / zinc metal layer by polishing can be performed after the metallurgical joining of the metal plate materials by diffusion annealing.

Furthermore, the superposed product (clad material) of the metal plate materials which are rolled and pressure-bonded by the method of the present invention is usually subjected to finish rolling after the polishing / removing operation of the copper / zinc metal layer and the diffusion annealing treatment operation. Then, by this finish rolling, the plate thickness is finally adjusted, and the polished surface is corrected to have a smooth rolling surface, so that the desired clad material is finished.

(Examples) In order to more specifically clarify the present invention, some of its examples will be given below, but the present invention is not construed as being limited to the examples described below. It goes without saying that various changes, modifications and improvements can be made without departing from the spirit of the present invention.

Example 1 A coil (coil A) made of nickel-based stainless steel (SUS304) having a plate thickness of 1.5 mm and a plate width of 100 mm, and 2 μ on each side.
A coil (coil B) made of pure nickel (VN _i R) with a thickness of 0.15 mm and a plate width of 100 mm and a copper plating layer with a thickness of m, and a plate thickness of 0.36 mm and a plate width of 100 mm Copper (C1020R)
The coil (coil C) consisting of is used to superpose them in the order of the coil B, the coil A, and the coil C, and the superposed product is cold-rolled by a rolling roll to integrally form the coils. Clad coil C crimped
Was manufactured. Then, the occurrence of seizure during rolling and pressure bonding of the clad coil D was examined. As a result, it was confirmed that seizure did not occur over the entire length (125 m) of the clad coil D.

Here, the mating surface of each coil was subjected to a cleaning treatment by wire brush polishing before they were superposed. Further, when rolling with a rolling roll, a reduction ratio of rolling a total plate thickness of 2.01 mm to a plate thickness of 1.1 mm in one pass was adopted. Furthermore, during such rolling,
The rolling roll surface was not lubricated.

Next, the mechanical pressure-bonded coil D obtained by the cold rolling is subjected to continuous bright annealing at 800 ° C. for 2 minutes, and each coil (B,
A coil E obtained by metallurgically joining (compressing) A and C) was obtained. Then, both surfaces of the coil E were examined. As a result, it was confirmed that smooth glossy surfaces were obtained on both sides of the coil E.

Further, the copper-plated surface of the coil E (the copper-plated surface of the coil B) is lightly ground by a flap wheel with a grain size of NO.500 to about 2 μm, and then the coil E is cold-rolled. Pressure: Finished to 0.25 mm coil F. As a result, it was confirmed that a smooth glossy nickel surface was obtained on the surface of the coil F on the coil B side.

On the other hand, in order to compare with the method of this embodiment, as in the conventional case, the coil A, the coil B ′ in which copper is not plated on the coil B, and the coil C are used, and the present embodiment is performed. Cold rolling was performed under the same superposition state and the same rolling conditions as in the example method, and the occurrence of seizure during rolling and pressure bonding was investigated. As a result, in the conventional method, seizure occurs at the contact surface between the coil B ′ and the rolling roll at the time of rolling about 25 m,
Thereafter, it was confirmed that the seizure continued to occur until the rolling operation was completed.

Further, the mechanical pressure-bonded coil D'obtained by the conventional method is subjected to the same bright annealing treatment as described above, and each coil constituting the coil D'is metallurgically bonded to the coil E '. Got However, in the coil E ', unlike the coil E, the surface on the side of the coil B'has a marked seizure surface, so that in order to obtain a smooth glossy surface, the grain size is NO.80, NO.160. , NO.320, NO.
It was necessary to carry out heavy grinding of 500 μm in total for one pass with a flap wheel of 500 and a total of 30 μm, and finally, after carrying out such heavy grinding, finish cold rolling could be carried out. By the finish cold rolling after the heavy grinding, a coil F'having a glossy surface similar to that of the coil F and having a plate thickness of 0.25 mm could be obtained.

As is clear from the above description, when the method of the present embodiment is adopted, the clad in which the coil B ′ and the coil C are integrally joined to both surfaces of the coil A as compared with the case where the conventional method is adopted. Since the material (coil F) can be manufactured extremely easily, and since seizure does not occur when the rolled product obtained by stacking the coils is pressure-bonded, it is not necessary to modify the rolling rolls one by one. is there. And therefore, compared with the case of adopting the conventional method,
The manufacturing cost of the clad material (coil F) can be significantly reduced.

As is clear from the above description, in this embodiment,
The coil B (B ') made of pure nickel constitutes an easily seized metal plate material which is in contact with the rolling roll.

Example 2 A plate having a thickness of 1 μm and a copper plating layer formed on both sides thereof; 2.
0 mm, plate width; 100 mm nickel-based stainless steel (SUS30
A coil consisting of 4) (coil G; easily seized metal plate material),
A coil (coil H) made of white copper (C7150) having a plate thickness of 0.12 mm and a plate width of 100 mm is wire-brushed at the mating surfaces thereof, and then laminated, and the plate thickness is obtained with a rolling roll; 1.
By cold rolling to 2 mm, a coil I was manufactured in which the coils G and H were mechanically integrally pressure-bonded. Then, the occurrence of seizure at the time of rolling and pressure bonding of the coil I was examined. As a result, it was confirmed that seizure did not occur over the entire length of the coil I (120 m).

In addition, in such cold rolling, a lubricating method was adopted in which sheep fat and oil was applied to the roll surface of the rolling roll from the rolling mill output side in very small amounts.

Further, the mechanical pressure-bonded coil I obtained by the cold rolling is subjected to a continuous bright annealing treatment at 800 ° C. for 2 minutes, and the coils G and H constituting the coil I are metallurgically bonded. The obtained coil J was obtained. Since this coil J had a good surface texture, its copper-plated surface (the copper-plated surface of the coil G) was lightly ground to about 1.5 μm with a flap wheel with a grain size of NO.500. After removing the copper plating layer, cold-rolled sheet thickness: 0.5mm
Finished and rolled. As a result, the coil K having a good surface texture could be obtained.

On the other hand, in order to compare with the method of the embodiment, as in the conventional case, a coil G ′ in which copper is not plated on the coil G and the coil H are used, and these coils G ′ and H are used. The superposed product obtained by superposing the above was subjected to cold rolling under the same rolling conditions as those in the above-described example method. Then, when the coils G ′ and H were pressure-bonded by the cold rolling, the occurrence of baking was examined as in the case described above. As a result, in the conventional method, seizure occurs at the contact surface between the coil G ′ and the rolling roll at the time of rolling about 40 m, and thereafter, the seizure is performed with the coil G ′ until the rolling operation is completed. It was confirmed that it occurred on the entire surface of contact with the roll.

Further, the mechanical pressure-bonded coil I'obtained by the conventional method is subjected to the bright annealing treatment similar to that described above to form a coil J'in which the coils constituting the coil I'are metallurgically bonded. Obtained. However, in the coil J ', unlike the coil J, the seizure flaw on the surface on the coil G'side is remarkable, and therefore, in order to obtain a good surface texture having a smooth glossy surface, the grain size; NO.80. 2 times with the flap wheel of NO.160, NO.160, NO.320, NO.5
It was necessary to perform heavy grinding of about 35 μm by the flap wheel grinding of No. 00 once for each of the five times in total. Then, after performing such heavy grinding, it becomes possible to finally carry out finish cold rolling, and by such finish cold rolling, a coil K'having a gloss surface similar to that of the coil K and having a plate thickness of 0.5 mm is obtained. I was able to get it.

In this way, when manufacturing the clad material (coil K) formed by integrally joining the coil G ′ and the coil H, if the method of the present embodiment is adopted, the conventional method is adopted as in the case of the above-mentioned embodiments. Compared to the case, the clad material can be manufactured very easily, and since seizure does not occur during cold rolling in which each coil is mechanically pressed, it is necessary to correct the roll surface of the rolling roll. It is not necessary to re-polish the roll surface one by one. And hence
When manufacturing the clad material (coil K) formed by integrally joining the coil G'and the coil H, the manufacturing cost can be remarkably reduced as compared with the case where the conventional method is adopted. is there.

Claims (3)

[Claims] 1. A laminated product obtained by stacking a plurality of metal plate materials, wherein at least one plate material in contact with the rolling roll is made of an easily-bakable metal material. Thus, when the plurality of metal plate materials are integrally pressure-bonded to each other, as a plate material made of the easily burnable metal material, a metal layer made of copper or zinc having a predetermined thickness is formed on at least the surface in contact with the rolling roll. A method for rolling and pressure-bonding a metal plate material which is easily bakeable, characterized in that the formed plate material is used. 2. The rolling and pressure bonding method according to claim 1, wherein the copper or zinc metal layer has a thickness of 1 μm or more. 3. The rolling and pressing method according to claim 1, wherein the copper or zinc metal layer is formed by plating or vapor deposition.