Clad material manufacturing apparatus and clad material manufacturing method

Abstract

To provide cladded material manufacturing equipment and a cladded material manufacturing method, each materialization of manufacture of cladded material by diffusion joining.SOLUTION: Cladded material manufacturing equipment is provided, comprising: a pair of first pressurization rollers which sandwich a plurality of metal strips in the vertical direction to pressurize them; and a pair of second pressurization rollers which are arranged on the downstream side of the first pressurization rollers with prescribed intervals between the first and the second pressurization rollers and pressurize the laminated metal strips which are formed by being sandwiched and laminated. One of the upper and lower pressurization rollers of the pair of first pressurization rollers is used as a roller electrode connected to an electric power source circuit and the other is as the insulation side roller in the insulated state from the electric power source circuit. The roller electrode and the insulation side roller of the pair of second pressurization rollers have the reverse configuration in the vertical direction with respect to the laminated metal strips from the roller electrode and the insulation side roller of the first pressurization rollers. A cladded material manufacturing method is provided in which a joint surface of the laminated metal strips is heated by causing the electric current to flow between the upper surface contacting one roller electrode of the laminated metal strips and the lower surface contacting the other roller electrode.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a clad material manufacturing apparatus and a clad material manufacturing method for manufacturing a clad material by diffusion bonding ultra-thin metal strips to each other.

Background Art

[0002] Patent Document 1 discloses a method for joining metal members, in which a plurality of metal members are brought into contact with each other, heated while being pressed using a heated pressing means, and heated by passing an electric current through the metal members in a state where the electric resistance of the metal members has increased due to heating, thereby joining the two metal members. And it describes that an electric current is passed between a pair of pressing punches or between a pair of pressing rollers, and the thickness of the metal member to be joined is such that the thickness of the thinnest metal member is 1 to 5×10 3 μm (1 to 5 mm).

[0003] Patent Document 2 discloses a method for manufacturing a clad material in which two or more metal strips are overlapped and rolled and joined, and at least one strip is heated by directly passing an electric current through the strip using a pair of pinch rollers installed on the inlet side of the rolling mill and the work rollers of the rolling mill as electrodes. And it is described that the range where heating and pressing are performed is the part of a pair of work rollers of the rolling mill, it is described that the temperature of the strip rapidly rises at the part of the pair of work rollers, the thickness of the metal member is described as the thinnest plate thickness of 0.05 mm (50 μm) in Example 2, and the line speed is described as 2.5 m / min (41.6 mm / second) in the example.

[0004] Patent Document 3 discloses a method for manufacturing a composite metal sheet by joining a titanium sheet and a steel sheet via an aluminum sheet or a copper sheet, characterized in that the titanium sheet is heated to a temperature of 400-800°C, the steel sheet to a temperature of 600-910°C, the aluminum sheet to a temperature of 400°C or less, and the copper sheet to a temperature of 200-600°C, and the sheets are fed into a pressure roller in an atmosphere with an oxygen concentration of 3% by volume or less, and pressed together at the aforementioned heating temperatures with a reduction ratio of 30% or less. The thinnest sheet thickness of the sheets to be joined is described as 0.1 mm (100 μm) in the examples. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2002-254175 [Patent Document 2] Japanese Patent Application Publication No. 5-192776 [Patent Document 3] Japanese Patent Application Publication No. 7-1161 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] The invention described in Patent Document 1 involves heating a metal material with a heated pressurizing means and then applying electric heating, resulting in a two-stage heating process. However, the temperature suitable for diffusion bonding—that is, the temperature at which atoms can cross the bonding surface and diffuse into the bonding interface—is reached at only one point between a pair of pressurizing punches or a pair of pressurizing rollers that are electrically heated by the pressurizing means. Therefore, heating and pressurizing can only be performed for an extremely short time, at the moment when atoms cross the bonding surface and enter the diffusion process, which makes it difficult for diffusion bonding at the bonding surface to proceed. Furthermore, since the bonding surface where metal materials are joined may have an oxide film, there is also the problem that a fragile intermetallic compound may be formed at the bonding interface.

[0007] The invention described in Patent Document 2 involves electrically heating each metal material while keeping them separated between the point where they are stacked and pressed, and the area just before that point. However, because the temperature of the metal strip rises rapidly at one point on the work roller of the rolling mill and is simultaneously pressed, heating and pressurization can only be performed for an extremely short time, just as atoms cross the bonding surface and enter the diffusion process, which makes it difficult for diffusion bonding at the bonding surface to proceed. Furthermore, since the bonding surface where the metal materials are joined may have an oxide film, there is a problem that fragile intermetallic compounds may be formed at the bonding interface.

[0008] The invention described in Patent Document 3 has a problem in that, because the multiple metal materials are stacked and pressurized at only one point on the compression roller, heating and pressurization can only be performed for an extremely short time at the moment when atoms cross the bonding surface and enter the diffusion process, making it difficult for diffusion bonding at the bonding surface to proceed. In addition, since the bonding surface where the metal materials are joined may have an oxide film, there is also the problem that a fragile intermetallic compound may be formed at the bonding interface.

[0009] This invention was conceived in view of these problems, and aims to provide a clad material manufacturing apparatus and clad material manufacturing method that realize the production of clad materials by diffusion bonding, which allows for a longer time for atoms to diffuse across the bonding surface while heating. [Means for solving the problem]

[0010] The clad material manufacturing apparatus according to claim 1 is a clad material manufacturing apparatus for diffusion bonding a plurality of strip-shaped metal strips by pressurizing and energizing, comprising: a pair of first pressure rollers that rotate while pressing and gripping a plurality of metal strips that are sent in a separated state in the vertical direction; a pair of second pressure rollers arranged downstream of the first pressure rollers at a predetermined interval, which rotate while pressing and gripping a laminated metal strip that is sandwiched and stacked by the first pressure rollers in the vertical direction; a vacuum pump that creates a vacuum in the space of the housing in which the first pressure rollers and the second pressure rollers are housed; a lifting means that connects the upper pressure roller of the first pressure roller and the upper pressure roller of the second pressure roller with a connector and moves them up and down simultaneously; and all four pressure rollers of the pair of first pressure rollers and the pair of second pressure rollers The rotating means is configured such that four roller gears fixed to each rotating shaft are rotated simultaneously at the same speed by a single drive gear connected to a rotational drive means, and the control unit controls at least the lifting distance of the lifting means, the energizing time and current value, and the rotational speed of the rotating means, and one of the upper or lower pressure rollers of the pair of first pressure rollers is a roller electrode connected to a heating power supply circuit and the other is an insulated roller that is insulated from the heating power supply circuit, and the roller electrode and insulated roller of the pair of second pressure rollers are configured in the opposite direction in the vertical direction to the roller electrode and insulated roller of the first pressure roller with respect to the laminated metal strip, and the joint surface is heated by passing a current between the joint surfaces of the two metal strips constituting the laminated metal strip in response to an energizing instruction signal from the control unit.

[0011] The clad material manufacturing apparatus according to claim 2 is characterized in that, in claim 1, the roller electrode is a conductive roller-shaped rotating body in which a pressurized current-carrying portion that contacts the entire width of the laminated metal strip and a rotating current-carrying portion that is capable of conducting electricity to a fixed conductor fixed to the housing of the pressurized current-carrying chamber, which constitutes a current path from a heating power supply, are integrally formed in series in the direction of the rotation axis, and the form of the means for conducting electricity from the fixed conductor to the rotating current-carrying portion is a form in which the roller-shaped outer surface of the rotating current-carrying portion is slidably fitted into a contact band made of an elastic conductive material which is the fixed conductor, or a form in which the roller-shaped outer surface of the rotating current-carrying portion is slidably in contact with a fixed conductor made of a material with high sliding properties and having an arc shape that matches the shape of the roller-shaped outer surface.

[0012] The clad material manufacturing apparatus according to claim 3 is characterized in that, in claim 1 or 2, a metal strip supply chamber capable of maintaining a vacuum state is provided upstream of the pressurized energizing chamber, the metal strip supply chamber comprises two unwinding rollers connected to a coil rotation drive means for winding a long, thin metal strip into a coil shape and unwinding the metal strip by rotation, a pair of upper and lower guide rollers for narrowing the vertical distance between the two metal strips unwound by the unwinding rollers, an argon gas ejection means, and a high-frequency power supply for supplying high-frequency power to generate plasma for etching the respective joint surfaces of the two metal strips.

[0013] The clad material manufacturing apparatus according to claim 4 is characterized in that, in claim 1 or 2, the control unit controls the feed rate of the laminated metal strip to any of 0.01 to 10 mm / second.

[0014] The clad material manufacturing apparatus according to claim 5 is characterized in that, in claim 1 or 2, the control unit enables continuous or intermittent energization and controls the energization time to be variable.

[0015] The clad material manufacturing method described in claim 6 is a clad material manufacturing method for diffusion bonding a plurality of strip-shaped metal strips by pressurizing and energizing, characterized in that, in a sealed space under vacuum, a pair of first pressure rollers pressurize a plurality of metal strips that are sent in a separated state by sandwiching them vertically, a pair of second pressure rollers arranged downstream of the first pressure rollers at a predetermined interval pressurize the laminated metal strips that are sandwiched and laminated by the first pressure rollers by sandwiching them vertically, one of the upper or lower pressure rollers of the pair of first pressure rollers is a roller electrode connected to a heating power supply circuit and the other is an insulating roller that is insulated from the heating power supply circuit, and the roller electrode of the pair of second pressure rollers and the insulating roller are configured in the opposite direction in the vertical direction to the laminated metal strips, and an energizing step is provided in which an electric current is passed between the bonding surfaces of the two metal strips constituting the laminated metal strip to heat the bonding surface.

[0016] The clad material manufacturing method according to claim 7, wherein the roller electrode, which is a conductive roller-shaped rotating body, comprises a pressurized current-carrying portion that contacts the entire width of the laminated metal strip and a current path from the heating power supply, Pressurized and energized room A fixed conductor fixed to the housing and a rotating current-carrying part that can conduct electricity Rotation axis The components are integrally formed in series, and the method of energizing the rotating energizing portion from the fixed conductor is characterized by either inserting the roller-shaped outer surface of the rotating energizing portion into a contact band made of an elastic conductive material, which is the fixed conductor, so as to allow it to slide, or by bringing the roller-shaped outer surface of the rotating energizing portion into slidable contact with a fixed conductor made of a highly slidable material and having an arc shape that matches the shape of the roller-shaped outer surface, so as to allow it to slide.

[0017] The clad material manufacturing method according to claim 8 is characterized in that, as a step prior to the pressurized energizing step, an etching step is provided in which, under vacuum conditions, two long, thin metal strips wound in a coil are unwound while rotating, and the joint surfaces of the two metal strips in front of a pair of guide rollers that narrow the gap between the two metal strips are etched with plasma generated by high-frequency power. [Effects of the Invention]

[0018] The clad material manufacturing apparatus and clad material manufacturing method of the present invention apply current to a wide area, encompassing the distance in the feed direction where two strip-shaped metal strips are pressed by a pair of pressure rollers, and extending across the entire width of the bonding surfaces of the two metal strips, within the range of a laminated metal strip formed by stacking two strip-shaped metal strips. This allows for greater diffusion of atoms at the bonding interface across the bonding surface, thereby enabling the production of a diffusion-bonded clad material with a metallurgically complete bond.

[0019] The clad material manufacturing apparatus and clad material manufacturing method of the present invention allows for effective heating of the joint surface of a laminated metal strip, which is formed by laminating two thin metal strips of 10 μm to 100 μm in thickness, by passing current from one surface to the other surface, with the joint surface included in the current path. Furthermore, by ensuring a long distance between the two pairs of pressure rollers, the heating temperature of the joint surface of the laminated metal strip can be maintained between the two pairs of pressure rollers, rather than just for a moment during pressurization. In addition, by slowing the feed speed of the laminated metal strip, heating can be performed for a longer period of time, which allows for greater diffusion of atoms across the joint surface at the joint interface, thereby enabling the formation of more metallurgically complete joints.

[0020] In addition, in the clad material manufacturing apparatus and the clad material manufacturing method of the present invention, since the bonding surfaces of the two metal strips are plasma-etched immediately before laminating the two metal strips, oxides and impurities on the bonding surfaces are removed so that clean bonding surfaces can be joined to each other. As a result, brittle intermetallic compounds are not formed, and crystal grains grow across the bonding interface over time, enabling a stronger bond to be realized.

[0021] In addition, when the rotation speed is set low, as a means of energizing from the fixed conductor to the rotating energizing part, a contact band made of an elastic conductive material is used for the fixed conductor, so that the effect of being able to pass a large current is achieved.

Brief Description of the Drawings

[0022] [Figure 1] It is a configuration explanatory diagram of the clad material manufacturing apparatus of the present invention in a form in which the roller-shaped outer peripheral surface of the rotating energizing part is slid on the contact band. [Figure 2] It is a configuration explanatory diagram of the clad material manufacturing apparatus of the present invention in a form in which the roller-shaped outer peripheral surface of the rotating energizing part is abutted against the arc-shaped fixed conductor. [Figure 3] It is an explanatory diagram of the metal strip supply chamber, and is an enlarged view of part A in FIG. 1 or FIG. 2. [Figure 4] It is an explanatory diagram of the winding chamber, and is an enlarged view of part B in FIG. 1 or FIG. 2. [Figure 5] It is an explanatory diagram of the lifting means, and is an enlarged view of part C in FIG. 1 or FIG. 2. [Figure 6] It is an explanatory diagram of the lifting part. [Figure 7] It is an explanatory diagram of the pressure energizing chamber in the case of a form in which the roller-shaped outer peripheral surface of the rotating energizing part is slid on the contact band. [Figure 8] It is an explanatory diagram of the pressure energizing chamber in the case of a form in which the roller-shaped outer peripheral surface of the rotating energizing part is abutted against the arc-shaped fixed conductor. [Figure 9]This diagram illustrates a configuration in which the roller-shaped outer surface of the rotating current-carrying part slides against the contact band. (a) is an explanatory diagram of the lower pressure roller configuration, and (b) is an explanatory diagram of a front view of the band housing incorporating the contact band. [Figure 10] This is an explanatory diagram of the lower pressure roller configuration, in which the roller-shaped outer surface of the rotating current-carrying part comes into contact with a fixed conductor having an arc shape. [Figure 11] This is an explanatory diagram of the gear train configuration that rotates a pair of first pressure rollers and a pair of second pressure rollers simultaneously at the same feed rate. [Figure 12] This is a schematic diagram illustrating section D in Figure 1. [Figure 13] This is an explanatory diagram of the current flow when the present invention is energized. [Figure 14] As a comparative example, this is a diagram illustrating the current flow when current is passed through a single thin plate during feeding. [Figure 15] As a comparative example, this is a diagram illustrating the flow of current when current is passed through each individual metal strip immediately before they are laminated. [Modes for carrying out the invention]

[0023] The clad material manufacturing apparatus of the present invention is an apparatus for manufacturing clad material by laminating two metal strips and performing diffusion bonding. As shown in Figure 1 or Figure 2, it comprises a metal strip supply chamber 2 for etching the bonding surfaces of metal strips 20a and 20b and supplying them, a pressurized current chamber 3 for laminating the supplied metal strips 20a and 20b and performing diffusion bonding by pressurized current to form a single laminated metal strip 21, and a winding chamber 30 for winding the laminated metal strip 21. The metal strip supply chamber 2, the pressurized current chamber 3, and the winding chamber 30 are all sealed, and a vacuum can be maintained in all chambers, with each chamber being connected by a cylindrical connecting member.

[0024] The clad material manufacturing apparatus 1 of the present invention, as shown in Figure 1 or Figure 2, is a clad material manufacturing apparatus 1 that diffusely bonds a plurality of strip-shaped metal strips 20a, 20b by pressurizing and energizing, and comprises a pair of first pressure rollers 4 that rotate while pressing the plurality of metal strips 20a, 20b that are sent in a separated state, sandwiched in the vertical direction, and pressed; a pair of second pressure rollers 5 that are arranged downstream of the first pressure rollers 4 at a predetermined interval and rotate while pressing the laminated metal strips 21 that are stacked sandwiched between the first pressure rollers 4, sandwiched in the vertical direction; a vacuum pump (not shown) that creates a vacuum in the space of the housing 18 in which the first pressure rollers 4 and the second pressure rollers 5 are housed; a lifting means 50 that connects the upper pressure roller 4a of the first pressure rollers 4 and the upper pressure roller 5a of the second pressure rollers 5 with a connector and moves them up and down simultaneously; and all four pressure rollers of the pair of first pressure rollers 4 and the pair of second pressure rollers 5 The device comprises a rotating means configured to rotate four roller gears 44a to 44d fixed to each rotation axis of the roller simultaneously at the same speed by a single drive gear 46 connected to a rotation drive means 45, and a control unit (not shown) that controls at least the lifting distance of the lifting means 50, the energizing time and current value, and the rotational speed of the rotating means, and one of the upper or lower pressure rollers of the pair of first pressure rollers 4 is configured to be a roller electrode 6 connected to a heating power supply circuit and the other is configured to be an insulated side roller 7 that is insulated from the heating power supply circuit, and the roller electrode 6 of the pair of second pressure rollers 5 and the insulated side roller 7 are configured to be in the opposite vertical direction to the roller electrode 6 of the first pressure roller 4 and the insulated side roller 7 with respect to the laminated metal strip 21, and the device heats the joint surface 40 by passing current between the joint surfaces 40a and 40b of the two metal strips 20a and 20b that constitute the laminated metal strip 21 in response to an energizing instruction signal from the control unit.

[0025] First, the metal strip supply chamber 2 will be described. As shown in Figure 3, the metal strip supply chamber 2 is equipped with an argon gas ejection means 33 and a high-frequency power supply 11 that supplies high-frequency power to generate plasma for etching the respective joint surfaces 40a and 40b of the metal strips 20a and 20b.

[0026] The metal strip supply chamber 2 has two unwinding rollers 8a and 8b, each connected to a coil rotation drive means (not shown) such as a servo motor, which winds metal strips 20a and 20b into coils, respectively. These unwinding rollers are installed at two locations separated vertically, and the unwinding rollers 8a and 8b are each connected to a coil rotation drive means (not shown) such as a servo motor. Guide rollers 15a and 15b are provided to change the feeding direction of the metal strips 20a and 20b that have been unwound from the unwinding rollers 8a and 8b and are separated vertically. Since the unwinding rollers 8a or 8b are connected to the coil rotation drive means such as a servo motor, they can unwind the wound metal strips 20a or 20b.

[0027] The guide rollers 15a and 15b are each rotatably mounted on their respective axes, and rotate in the direction in which the metal strips 20a and 20b are fed due to friction when the unwound metal strips 20a and 20b come into contact with them. Furthermore, the guide rollers 15a and 15b are mounted with a small gap between them. This allows etching to be performed on the respective joining surfaces 40a and 40b of the metal strips 20a and 20b.

[0028] The etching process involves ejecting argon gas from the argon gas ejection means 33 under vacuum conditions and applying high-frequency power from the high-frequency power supply 11. This causes argon ions to strike the bonding surface 40a of the metal strip 20a and the bonding surface 40b of the metal strip 20b, knocking off oxides and impurities adhering to the bonding surfaces 40a and 40b, thus cleaning them. As a result, brittle intermetallic compounds are not formed on the bonding surface 40 of the clad material, and crystal grains grow across the bonding interface over time, achieving a strong bond.

[0029] The metal strips 20a and 20b, whose joint surfaces 40a and 40b have been cleaned, contact and are guided by the outer surfaces of the guide rollers 15a and 15b, respectively, and are supplied to the pressurized and energized chamber 3 while maintaining a narrow gap between them.

[0030] Next, the pressurized and energized chamber 3 will be described. As shown in Figures 1, 2, 7, or 8, the pressurized and energized chamber 3 is equipped with a pair of first pressurizing rollers 4 that pressurize a plurality of metal strips 20a and 20b that are sent in a separated state by clamping them from above and below, a pair of second pressurizing rollers 5 that are arranged downstream of the first pressurizing rollers 4 at a predetermined interval and pressurize the laminated metal strips 21 that are stacked by clamping them from above and below, and a vacuum pump (not shown) that creates a vacuum in the space of the housing 18 in which the first pressurizing rollers 4 and the second pressurizing rollers 5 are installed.

[0031] Furthermore, as shown in Figures 1, 2, or 5, the system includes a lifting mechanism 50 that connects the upper pressure roller 4a of the first pressure roller 4 and the upper pressure roller 5a of the second pressure roller 5, allowing them to move up and down as a single unit. The lifting mechanism 50 is configured such that a gear 52 rotates with the rotation of a servo motor 51 whose rotation speed and rotation time are controlled by a control unit, and a gear 53 is screwed to it, which rotates a ball screw 54 that is fixed and connected to the gear 53 by a power lock or key, causing a nut boss 58 that is screwed to the ball screw 54 to move up and down.

[0032] As the nut boss 58 moves up and down, as shown in Figure 6, the cylindrical electrode punch 56 fixed and connected to the nut boss 58, the middle plate portion 57 fixed and connected to the electrode punch 56, the upper pressure roller 4a and the upper pressure roller 5a become a moving part 55 and move up and down together as a single unit. During the moving up and down, the guide rods 90 are fitted into the guide holes 57a provided at both ends of the middle plate portion 57, and the electrode punch 56 is fitted into the guide holes 91 and guided up and down. The guide rods 90 and the guide holes 91 are fixed so as to be integral with the housing 18.

[0033] Furthermore, as shown in Figure 11, the height of the lifting mechanism 50 is controlled so that the roller gear 44d mounted coaxially with the upper pressure roller 4a, and the roller gear 44c mounted coaxially with the upper pressure roller 5a, are raised and lowered only by a distance that allows them to maintain a screw-like contact state with either the roller gear 44b or the roller gear 44a during descent.

[0034] Next, the rotating means for the pair of first pressure rollers 4 and the pair of second pressure rollers 5 will be described. As shown in Figure 9(a), Figure 10, or Figure 11, the rotating means is configured such that four roller gears 44a to 44d, fixed to the rotation axis of each of the four pressure rollers of the pair of first pressure rollers 4 and the pair of second pressure rollers 5, are rotated simultaneously at the same speed by a single drive gear 46 connected to a rotational drive means 45. In this configuration, for example, the drive gear 46 is screwed to the lower roller gear 44b of the pair of first pressure rollers 4 and the lower roller gear 44a of the pair of second pressure rollers 5, the lower roller gear 44b is screwed to the upper roller gear 44d, and the lower roller gear 44a is screwed to the upper roller gear 44c. The roller gears 44a to 44d are all the same gear having the same pitch circle.

[0035] The control unit controls the feed speed of the servo motor, which is the rotational drive means 45, that is, the feed speed of the laminated metal strip 21, to one of the ranges from 0.01 to 10 mm / second, thereby slowing down the feed speed. This allows the time for which current flows through the joint 40 of the laminated metal strip 21 to be extended, and a contact band can be used as the energizing means.

[0036] Then, as shown in Figures 7, 8, 12, or 13, one of the upper or lower pressure rollers of the pair of first pressure rollers 4 is configured as a roller electrode 6 connected to the power supply circuit of the heating power supply 10, and the other is configured as an insulated roller 7 that is insulated from the power supply circuit of the heating power supply 10. Furthermore, the roller electrode 6 of the pair of second pressure rollers 5 and the insulated roller 7 are configured in the opposite direction in the vertical direction to the laminated metal strip 21 compared to the roller electrode 6 of the first pressure roller 4 and the insulated roller 7. In response to the energization instruction signal from the control unit, a current 80 is passed between the upper surface 25 of the laminated metal strip 21 that is in contact with one of the roller electrodes 6 and the lower surface 26 of the other that is in contact with the roller electrode 6, thereby heating the bonding surface 40 of the laminated metal strip 21. Since the width of the roller electrode 6 is wider than the width of the metal strips 20a and 20b, the current 80 can be passed through the entire width of the metal strips 20a and 20b or the laminated metal strip 21. Furthermore, since the current 80 is passed through the laminated metal strip 21 over the distance from the pair of first pressure rollers 4 to the pair of second pressure rollers 5, atoms at the bonding interface, which is the bonding surface 40, can be diffused more widely across the bonding surface 40, thereby forming more metallurgically complete bonding areas.

[0037] As shown in Figure 14 or 15 as a comparative example, when a current 80 is passed through the non-jointed surface 41 of the same metal strip 20 (20a or 20b), the current 80 flows along the shortest distance between the electrode rollers 6a and 6b, making it difficult for current to flow to the jointed surface 40. Furthermore, as shown in Figure 15, since the current 80 is not passed through the laminated metal strip 21 downstream from the pressurized area by the roller electrodes 6a and 6b, the temperature of the jointed surface 40 of the laminated metal strip 21 downstream from the roller electrodes 6a and 6b tends to decrease when the laminated metal strip is composed of thin metal strips. On the other hand, if the heating temperature of the two separated metal strips upstream of the roller electrodes 6a and 6b is increased, there is a concern that the metal strip itself may undergo thermal deformation if the metal strip is thin.

[0038] Next, the current path from the heating power supply 10 to the roller electrode 6 will be described. First, as shown in Figure 9(a) or Figure 10, the roller electrode 6 is a conductive roller-shaped rotating body arranged perpendicular to the feeding direction of the laminated metal strip 21 in a plan view. It consists of a pressurized current-carrying portion 64 that contacts the entire width of the laminated metal strip 21, and rotating current-carrying portions 62 and 63 that are capable of conducting electricity with a fixed conductor 61 fixed to the housing 18 of the pressurized current-carrying chamber 3, which constitutes the current path from the heating power supply 10. These portions are integrally formed in series in the direction of the rotation axis.

[0039] Furthermore, there are two forms of the current-carrying means for electrically connecting the fixed conductor 61 to the rotating current-carrying parts 62 and 63. The first form, as shown in Figure 7 or Figure 9, is a form in which the roller-shaped outer surface of the rotating current-carrying part 62 is slidably fitted into a contact band 60 made of an elastic conductive material, which is the fixed conductor. Since the contacts of the compact band 60 are springy, it is possible to conduct current at both high and low currents to the rotating current-carrying part 62 of the roller electrode 6 which rotates at a slow speed. The band housing 60a incorporating the contact band 60 is fixed to the fixed conductor 68 with bolts to a female thread 60b as shown in Figure 9(b).

[0040] While contact bands 60 are generally used to conduct current between fixed members, this invention uses them for the first time because the feed rate of the laminated metal strip 21 is slow, at a feed rate of 0.01 to 10 mm / second. This allows for the passage of large currents and reduces the size of the current path.

[0041] Next, the second embodiment, as shown in Figure 8 or Figure 10, is a configuration in which the roller-shaped outer surface of the rotating energizing portion 63 is slidably brought into contact with a fixed conductor 61 made of a material with high sliding properties and having an arc shape that matches the roller-shaped outer surface. The fixed conductor 61 with the arc shape and the rotating energizing portion 63 of the roller electrode 6 are in surface contact within the arc shape and energized. The fixed conductor 61 with the arc shape is suitable to be made of a material that has sliding properties and conductivity, such as graphite.

[0042] As shown in Figures 1, 2, 9(a), or 10, the contact band 60 or the arc-shaped fixed conductor 61 is fixed to a fixed conductor 68, such as a highly conductive copper body, which is installed on the base stand 93, which is a current path connected to the heating power supply 10 in a way that allows current to flow through it.

[0043] Furthermore, a layer of carbon can be formed on the outer surface of the pressurized current-carrying portion 64 of the roller electrode 6. In this case, since the carbon layer has the functions of conducting electricity and heating, heating by heat transfer can be achieved in addition to heating by Joule heating due to the current-carrying of the laminated metal strip 21.

[0044] Next, the winding chamber 30 will be described. As shown in Figures 1, 2, or 4, the winding chamber 30 is equipped with a winding roller 9 connected to a rotating means (not shown) such as a servo motor for winding the laminated metal strip 21, and the winding roller 9 winds the laminated metal strip 21 that is sent from the second pressure roller 5. In addition, a guide roller 16 that can rotate by friction is provided as a guide to form a path for smoothly sending the laminated metal strip 21 that is sent from the heating and energizing chamber 3 to the winding roller 9.

[0045] The laminated metal strip 21, which is fed out from the second pressure roller 5, is guided along a path by the guide roller 16 and wound onto the winding roller 9.

[0046] Next, the control unit will be described. The control unit controls at least the lifting distance of the lifting means 50 and the rotational speed of the rotating means, the ejection control of the argon gas ejection means 33, the operation control of the high-frequency power supply 11, the rotation control of the unwinding roller 8, the operation control of the vacuum pump, the rotation time and rotational speed of the servo motor 51, the energization time, current value, energization interval, etc. of the heating power supply 10, and controls the rotational speed of the winding roller 9.

[0047] Furthermore, the control unit can enable continuous or intermittent power supply.

[0048] Next, a clad material manufacturing method will be described. The clad material manufacturing method is a clad material manufacturing method in which multiple strip-shaped metal strips 20a and 20b are diffusely bonded by pressurization and current application, wherein in a sealed space under vacuum, a pair of first pressure rollers 4 pressurize the multiple metal strips 20a and 20b that are sent in a separated state by clamping them from above and below, and a pair of second pressure rollers 5, which are arranged downstream of the first pressure rollers 4 at a predetermined distance apart, pressurize the laminated metal strips 21 that are stacked by clamping them from above and below, and the upper side of the pair of first pressure rollers 4 or The device includes a pressurizing and energizing step in which a current 80 is passed between the joining surfaces 40a and 40b of the two metal strips 20a and 20b constituting the laminated metal strip 21, thereby heating the joining surface 40, with one of the lower pressure rollers being a roller electrode 6 connected to a heating power supply circuit and the other being an insulated roller 7 that is insulated from the heating power supply circuit, and the roller electrode 6 of the pair of second pressure rollers 5 and the insulated roller 7 being configured in the opposite direction in the vertical direction relative to the first pressure roller 4 and the insulated roller 7.

[0049] Furthermore, the roller electrode 6, which is a conductive roller-shaped rotating body arranged perpendicular to the feeding direction of the laminated metal strip 21 in a plan view, has a pressurized energizing portion 64 that contacts the entire width of the laminated metal strip 21, and rotatable energizing portions 62 and 63 that can conduct electricity with fixed conductors 60 and 61 fixed to the housing 18 of the pressurized energizing chamber 3, which constitute the current path from the heating power supply, and these portions are integrally formed in series in the direction of the rotation axis. The method of energizing from the fixed conductors 60 and 61 to the rotatable energizing portions 62 and 63 is to slidably insert the roller-shaped outer surface of the rotatable energizing portion 62 into a contact band 60 made of an elastic conductive material which is the fixed conductor 60 and 61, and to energize it, or to slidably contact the roller-shaped outer surface of the rotatable energizing portion 63 with a fixed conductor 61 made of a material with high sliding properties and having an arc shape that matches the shape of the roller-shaped outer surface, and to energize it.

[0050] Furthermore, as a step prior to the pressurized current application step, the device includes an etching step in which, under vacuum conditions, two long, thin metal strips 20a and 20b, wound in a coil shape, are unwound while rotating, and the respective joint surfaces 40a and 40b of the two metal strips 20a and 20b in front of a pair of guide rollers 15a and 15b that narrow the gap between the two metal strips 20a and 20b are etched with plasma generated by high-frequency power. [Explanation of symbols]

[0051] 1. Clad material manufacturing equipment 2. Metal Strip Supply Room 3. Pressurized and energized room 4. First pressure roller 5. Second pressure roller 6 Roller electrodes 7. Insulated roller 8. Unwinding roller 9. Winding roller 10 Heating power supply 11 High frequency power supply 12 Vacuum pump 15 Guide rollers 16 Guide Rollers 18 cabinets 20 Metal strip 21. Laminated metal strip 25 Top side 26 Bottom side 30 Rewinding chamber 33 Argon gas ejection means 40 Joint surface 41 Non-bonded surface 44 Gears for rollers 45 Rotary drive means 46 Drive gears 50 Lifting and lowering means 51 Servo motor 52 Gears 53 Gears 54 Ball Screw 55 Lifting section 56 Electrode Punch 57 Middle plate section 57a Guide hole section 58 Nut Boss 60 Contact Bands 60a band housing 61 Fixed conductor 62 Rotating energized parts 63 Rotating energized parts 64 Pressurized and energized areas 68 Fixed conductor 80 current 90 Guide rod 91 Guide hole section 93 Base stand

Claims

1. A clad material manufacturing apparatus that diffuse-bonds multiple strip-shaped metal strips by pressurizing and energizing, A housing-shaped pressurized and energized chamber comprising: a pair of first pressure rollers that rotate while pressing and gripping multiple metal strips being sent in a separated state in the vertical direction; a pair of second pressure rollers that rotate while pressing and gripping laminated metal strips stacked between the first pressure rollers in the vertical direction, disposed downstream of the first pressure rollers at a predetermined distance apart; and a vacuum pump that creates a vacuum in the space of the housing in which the first and second pressure rollers are housed; A lifting mechanism that connects the upper pressure roller of the first pressure roller and the upper pressure roller of the second pressure roller with a connecting device and moves them up and down simultaneously, A rotating means configured such that four roller gears, fixed to the rotation axis of each of the four pressure rollers of the pair of first pressure rollers and the pair of second pressure rollers, are rotated simultaneously at the same speed by a single drive gear connected to a rotational drive means, The system includes at least a control unit that controls the lifting distance of the lifting means, the energizing time and current value, and the rotational speed of the rotating means, One of the upper or lower pressure rollers of the pair of first pressure rollers is configured as a roller electrode connected to a heating power supply circuit, and the other is configured as an insulated roller that is insulated from the heating power supply circuit, and the roller electrode of the pair of second pressure rollers and the insulated roller are configured in the opposite direction in the vertical direction to the roller electrode of the first pressure roller and the insulated roller with respect to the laminated metal strip. A clad material manufacturing apparatus characterized by heating the joint surface by passing an electric current between the joint surfaces of two metal strips constituting the laminated metal strip in response to an energization instruction signal from the control unit.

2. The roller electrode is a conductive roller-shaped rotating body in which a pressurized current-carrying portion that contacts the entire width of the laminated metal strip and a rotating current-carrying portion that is capable of conducting electricity to a fixed conductor fixed to the housing of the pressurized current-carrying chamber, which constitutes a current path from the heating power supply, are integrally formed in series in the direction of the rotation axis. The form of the means for supplying current from the fixed conductor to the rotating current-carrying part is, The clad material manufacturing apparatus according to claim 1, characterized in that the roller-shaped outer surface of the rotating current-carrying portion is slidably fitted onto a contact band made of an elastic conductive material, which is the fixed conductor, or in which the roller-shaped outer surface of the rotating current-carrying portion is slidably brought into contact with a fixed conductor made of a highly slidable material and having an arc shape that matches the shape of the roller-shaped outer surface.

3. Upstream of the pressurized and energized chamber, a metal strip supply chamber capable of maintaining a vacuum state is provided, and the metal strip supply chamber has two unwinding rollers connected to a coil rotation drive means that winds a long, thin metal strip into a coil shape and unwinds the metal strip by rotation, A pair of upper and lower guide rollers that narrow the vertical distance between the two metal strips unwound by the aforementioned unwinding roller, The clad material manufacturing apparatus according to claim 1 or 2, further comprising: an argon gas ejection means; and a high-frequency power supply that supplies high-frequency power for generating plasma to etch the respective bonding surfaces of the two metal strips.

4. The clad material manufacturing apparatus according to claim 1 or 2, characterized in that the control unit controls the feed rate of the laminated metal strip to any of 0.01 to 10 mm / second.

5. The clad material manufacturing apparatus according to claim 1 or 2, characterized in that the control unit enables continuous or intermittent energization and controls the energization time to be varied.

6. A method for manufacturing clad material, which involves diffusion bonding multiple strip-shaped metal strips by pressurizing and applying an electric current, In a sealed space under vacuum, a pair of first pressure rollers pressurize multiple metal strips being sent in a separated state by gripping them vertically, and a pair of second pressure rollers, arranged downstream of the first pressure rollers at a predetermined distance apart, pressurize the laminated metal strips that are stacked and sandwiched by the first pressure rollers by gripping them vertically. One of the upper or lower pressure rollers of the pair of first pressure rollers is configured as a roller electrode connected to a heating power supply circuit, and the other is configured as an insulated roller that is insulated from the heating power supply circuit, and the roller electrode and insulated roller of the pair of second pressure rollers are configured in the opposite direction in the vertical direction to the roller electrode and insulated roller of the first pressure rollers with respect to the laminated metal strip. A method for manufacturing clad material, characterized by comprising a pressurized current application step of heating the joint surface by passing an electric current between the joint surfaces of two metal strips constituting the laminated metal strip.

7. The roller electrode, which is a conductive roller-shaped rotating body, is integrally formed in series in the direction of the rotation axis, with a pressurized current-carrying portion that contacts the entire width of the laminated metal strip and a rotating current-carrying portion that can conduct electricity to a fixed conductor fixed to the housing of the pressurized current-carrying chamber, which constitutes the current path from the heating power supply. The method of supplying current from the fixed conductor to the rotating current-carrying part is, The clad material manufacturing method according to claim 6, characterized in that it is a method of applying current by slidably fitting the roller-shaped outer surface of the rotating current-carrying portion into a contact band made of an elastic conductive material, which is the fixed conductor, or a method of applying current by slidably contacting the roller-shaped outer surface of the rotating current-carrying portion into a fixed conductor made of a material with high sliding properties and having an arc shape that matches the shape of the roller-shaped outer surface.

8. The clad material manufacturing method according to claim 6 or 7, characterized in that, as a step prior to the pressurized energizing step, two long, thin metal strips wound in a coil shape are unwound while rotating under vacuum conditions, and the joint surfaces of the two metal strips in front of a pair of guide rollers that narrow the gap between the two metal strips are etched with plasma generated by high-frequency power.

Images