JP4103124B2 - Sheet material manufacturing method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for producing a thin plate, in particular, by directly pressing a conductive powder material from a powder state.
[0002]
[Prior art]
Conventionally known is a method of continuously producing sheet material by forming powders of difficult-to-process current-carrying materials such as tungsten and molybdenum under normal temperature and high pressure, and further through processing steps such as sintering, hot forging and rolling. Yes.
[0003]
However, such a method has a problem in that the machining process is complicated, various facilities are required, the yield is low, and the product cost is high.
Therefore, there has been proposed a powder rolling means for directly producing a thin plate by directly rolling a powder in a high temperature state without passing through processing steps such as sintering, hot forging, and rolling (for example, JP-A-2-115302). No. 7, JP-A-7-138610, JP-A-11-158510, etc.).
[0004]
[Problems to be solved by the invention]
As schematically shown in FIG. 4, the powder rolling means of Japanese Patent Laid-Open No. 2-115302 is made to supply conductive powder 3 between two current-carrying rolls 1, and energize between the current-carrying rolls to produce powder. Resistance heating and powder rolling in a high temperature state. In FIG. 4, 2 is a hopper, 4 is a molded sheet material, and 5 is a power supply device.
Japanese Patent Application Laid-Open No. 11-15851 proposes an electro-rolling forming means that takes into consideration powder mixed with different metals.
Furthermore, as a method for increasing the electrical resistance of the heating section to obtain a desired calorific value and reducing the current, the energizing powder rolling means of JP 07-138610 A is a method for retaining powder on the upper part of a pair of energizing rolls. A method has been proposed in which the current is reduced by increasing the electrical resistance by providing an electrode plate in the part and increasing the distance between the electrodes.
[0005]
However, a large current is required to perform high-temperature processing, but the means shown in FIG. 4 is an outer diameter of the sliding ring, which is a member that supplies power to the energizing roll from the power supply device in the energization method. It is necessary to take measures to increase the length, length of the body, or a combination of both, which increases the size of the equipment, increases the equipment cost, and makes it impossible to install due to structural constraints. It was.
On the other hand, an insulation measure with a high insulation resistance is required because of the electrolytic corrosion and leakage current (stray current) of the rotating portion that supports the energizing roll.
Further, the method having the electrode plate in the powder part shown in FIG. 5 has a problem of obstructing the flow of the powder inserted between the current-carrying rolls in addition to the problem of FIG.
[0006]
The present invention has been developed to solve such problems.
That is, an object of the present invention is to provide a method and an apparatus for efficiently producing a sheet material without impairing the original properties of the powder.
[0007]
[Means for Solving the Problems]
According to the present invention, the thin belt-like substrate (11) is passed through the roll gaps of the pair of forming rolls (12), the powder material (13) is supplied to both sides thereof, and the powder material is pressed between the forming rolls to form a base. Forming a sheet material (15) made of a material and a powder material, and then passing the composite sheet material with a tension between at least a pair of electrode shoes (14), and energizing between them to heat the powder material, A method for producing a sheet material is provided.
[0008]
Further, according to the present invention, a pair of forming rolls (12) and at least a pair of electrode shoes (14) provided downstream thereof are provided, and the thin belt-like substrate (11) is passed through the roll gap of the forming rolls. Then, the powder material (13) is supplied to both sides, the base material and the powder material are pressed between the forming rolls to form the sheet material (15), and then the sheet material is tensioned between at least a pair of electrode shoes. An apparatus for producing a sheet material is provided, in which the powder material is heated by energizing between them.
[0009]
According to the above-described method and apparatus of the present invention, a composite comprising a combination of a band-shaped metal substrate (11) and a powder material (13), which is simply press-molded and heated without being heated by a molding roll (12). Since the sheet material (15) is heated by energizing at least a pair of upper and lower electrode shoes (14) installed downstream of the forming roll, the sheet is heated in a short time to suppress inter-metal fusion and adhere between the metals. The material can be manufactured.
That is, it becomes possible to apply a tension in the line direction to a sheet material in which powder is compression molded on the surface of the core material, and by providing at least a pair of upper and lower electrode shoes (14) shifted in the line direction downstream of the molding roll. Since the resistance between the electrodes increases and the supply voltage is increased, the supply power is increased and heating can be performed rapidly, so that the bonding between the powders is instantaneously performed, which may impair the characteristics of the powder itself. The sheet material can be manufactured without any problem.
In addition, by using a simple pressure forming roll instead of the energizing roll, an excessive slip ring is not required, and the insulation measures for the fixed member can be simplified compared to the insulation measures including the rotating member.
[0010]
According to the second embodiment of the present invention, the rolling mill (16) is provided downstream of the electrode shoe (14), and the composite sheet material (15) heated by energization is rolled to further bond the powder materials. By providing the rolling mill (16), not only the bonding between the powder materials but also the bonding between the belt-like base material and the powder material can be strengthened, and the thickness of the finished sheet material can be made uniform.
[0011]
Furthermore, the composite sheet material (15) formed by the pressing is provided with a chamber (18) for holding it in an inert gas atmosphere, a reducing atmosphere or a vacuum atmosphere. By providing such a chamber (18), the composite sheet material (15) can be prevented from being oxidized, and the bonding between the powder materials and between the band-shaped substrate and the powder material can be stabilized.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the common part in each figure, and the overlapping description is abbreviate | omitted.
[0013]
FIG. 1 is a diagram showing a first embodiment of a sheet material manufacturing apparatus according to the present invention. As shown in the figure, the manufacturing apparatus 10 according to the present invention includes at least one pair of forming rolls 12 and a guide roll 19a that changes the flow direction of the downstream composite sheet material 15 and provided downstream thereof. A thin belt-like metal base material 11 is passed through the roll gap of the forming roll 12, and the conductive powder material 13 is supplied to both sides of the thin metal base 11, and the base 11 and the conductive powder are pressed between the forming rolls. The composite sheet material 15 made of the material 13 is molded, and then the composite sheet material 15 is passed through at least one pair of electrode shoes 14 with tension applied between them, and the powder material is heated and molded between them. ing.
[0014]
In the manufacturing apparatus 10 of FIG. 1, the strip-shaped base material 11 wound in a coil shape is installed on the upper part of the forming roll 12, the unrolled strip-shaped base material 11 is passed through the roll gap of the forming roll 12, and then the electrode shoe 14 The winder 17 continuously winds through the gap. Reference numerals 19a and 19b in this figure denote guide rollers, which smoothly guide the composite sheet material 15 that has exited the forming roll 12 between the electrode shoes 14.
[0015]
The strip-shaped substrate 11 is preferably a strip-shaped conductive substrate of foil material, lath metal or punch metal. Further, the lath metal or punch metal belt-like conductive base material has an opening portion penetrating in the thickness direction, and by filling the powder material 13 in the opening portion, the contact between the belt-like base material 11 and the powder material 13 is achieved. The sheet material having a uniform specific resistance in the width direction can be obtained by increasing the area, preventing peeling of the base material and the powder during the passage after pressure molding.
[0016]
The pair of forming rolls 12 are arranged horizontally with a gap between the rolls, and the band-shaped substrate 11 is inserted between the rolls first. In addition, the powder material 13 is continuously supplied to both sides of the belt-like substrate 11 by a supply device (not shown) on the upper part of the roll gap of the forming roll 12. Further, the pair of forming rolls 12 is provided with a synchronous rotation driving device, pressurizing the band-shaped base material 11 and the powder material 13 to form the composite sheet material 15 and transporting it downward.
[0017]
In this example, at least one pair of electrode shoes 14 are arranged at intervals in the horizontal direction. Further, the contact surface of each electrode shoe 14 with the composite sheet material is formed smoothly so as not to damage the composite sheet material. Further, the composite sheet material 15 positioned between the electrode shoes 14 can be applied with an arbitrary tension.
Furthermore, a current is passed between at least one pair of electrode shoes 14 by a power supply device (not shown), and heat generation (Joule heat) due to internal resistance of the composite sheet material 15 positioned between them causes powder-to-powder and powder The belt-like base material is diffusion-bonded to each other. The energization current may be direct current or alternating current. Moreover, even if a large current is required for this energization, an excessive slip ring is not necessary, so that the equipment cost can be greatly reduced.
[0018]
In FIG. 1, the apparatus of the present invention includes a rolling mill 16 downstream of the electrode shoe 14. By providing the rolling mill 16 immediately after the electrode shoe 14, the powder material can be more strongly bonded by immediately rolling the composite sheet material 15 heated between the electrode shoes and having a high temperature.
[0019]
The apparatus of the present invention further includes a chamber 18 that holds the roll-formed composite sheet material 15 in an inert gas atmosphere or a vacuum atmosphere. The chamber 18 is configured such that the composite sheet material 15 can pass through the interior while blocking the atmosphere. Accordingly, the inside of the chamber 18 is filled with an inert gas (Ar, N _2, etc.) and a reducing gas (H _2, etc.) and held in an inert gas atmosphere or a reducing atmosphere, or evacuated and held in a vacuum atmosphere. Thus, the composite sheet material 15 can be effectively heated to form a sheet material.
[0020]
FIG. 2 is a diagram showing a second embodiment of the manufacturing apparatus of the present invention. In the present embodiment, the guide roller 19c is installed on the downstream side of the electrode shoe 14 to place the guide roller 19c and the guide roll 19b in a predetermined position, thereby stabilizing the contact between the electrode shoe surface and the sheet material 15 and energizing. Spark inside can be suppressed, and damage to the electrode shoe and rough skin on the composite sheet material surface can be prevented. Other configurations are the same as those in FIG.
[0021]
FIG. 3 is a schematic view of a preferred belt-like substrate, in which (A) is a plan view and (B) is a cross-sectional view of A in (A). This belt-like sheet material is filled with the powder material 13 in the opening portion, increases the contact area between the belt-like base material 11 and the powder material 13, heats the powder material 13 with heat generated by energization, and promotes close-contact molding. be able to.
[0022]
According to the above-described method and apparatus of the present invention, the combination of the belt-like base material 11 and the conductive powder material 13 is simply press-formed without being heated by the forming roll 12, so that the properties of the mixed metal powder are changed. It can be formed into a sheet-like composite sheet material 15 without doing so. Further, since the molded composite sheet material 15 is energized and heated by at least a pair of electrode shoes 14 different from the pressure molding, the sheet material is manufactured by heating in a short time and closely contacting the metals. be able to.
[0023]
Therefore, it can be rapidly heated by energization heating, and the bonding between the powders is performed in a short time, thereby producing a sheet material having properties that do not impair the physical properties of the powder without impairing the properties of the powder itself. be able to. In addition, since the heating is performed by the electrode shoe rather than the heating by the forming roll, an excessive slip ring is not required, and the equipment cost can be greatly reduced.
[0024]
In addition, this invention is not limited to embodiment mentioned above, Of course, it can change variously in the range which does not deviate from the summary of this invention.
[0025]
【The invention's effect】
As described above, the sheet manufacturing method and apparatus of the present invention can be simplified and made compact by eliminating the current-carrying member of the rotating part, thereby reducing equipment cost and stray current. And power consumption can be saved. Further, it has excellent effects such as prevention of melting and integration of the powder, and production of a sheet material without impairing the physical properties of the powder.
[Brief description of the drawings]
FIG. 1 is a diagram showing a first embodiment of a sheet material manufacturing apparatus according to the present invention.
FIG. 2 is a view showing a second embodiment of the sheet material manufacturing apparatus according to the present invention.
FIG. 3 is a schematic view of a preferred band-shaped metal substrate.
FIG. 4 is a schematic view of conventional powder rolling means.
FIG. 5 is another schematic view of a conventional powder rolling means.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Current supply roll 2 Hopper 3 Current supply powder 4 Current supply rolling sheet material 5 Power supply device 6 Forming roll 7 Electrode plate 10 Sheet material manufacturing apparatus 11 Strip-shaped base material 12 Forming roll 13 Electroconductive powder material 14 Electrode shoe 15 Composite sheet material 16 Rolling Machine 17 Winding machine 18 Chamber 19a, 19b, 19c Guide roll

Claims (5)

A thin belt-like base material (11) is passed through the roll gap of a pair of forming rolls (12), the powder material (13) is supplied to both sides thereof, and the powder material is pressed between the forming rolls to form the base material and the powder material. Forming a composite sheet material (15), then passing the composite sheet material with tension between at least a pair of electrode shoes (14), and energizing between them to heat mold the powder material. A method for producing a sheet material. The method for producing a sheet material according to claim 1, wherein the powder materials are further bonded by rolling after energization heating. A pair of forming rolls (12) and at least a pair of electrode shoes (14) provided downstream thereof are provided, and a thin belt-like substrate (11) is passed through the roll gap of the molding roll, An electrically conductive powder material (13) is supplied to both sides, a base material and a powder material are pressed between molding rolls to form a sheet material (15), and then the composite sheet material is placed between at least a pair of electrode shoes. An apparatus for producing a sheet material, wherein the sheet material is passed through with tension, and the powder material is heat-molded by energization therebetween. The sheet according to claim 3, further comprising a rolling mill (16) downstream of the electrode shoe (14), and rolling the composite sheet material (15) that is energized and heated to further bond between the powder materials. Material manufacturing equipment. The sheet material according to claim 3, further comprising a chamber (18) for holding the composite sheet material (15) heated and heated between the electrode shoes in an inert gas atmosphere or a vacuum atmosphere. Manufacturing equipment.

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