JP2000256704A - Production of thin sheet material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a thin sheet material which can uniformly transmit liquid, gas or light, with a powder rolling. SOLUTION: When the thin sheet material 14 is produced by supplying the powder into the gap between one pair of rolling rolls 1, 2 through a powder supplying means 41 and rolling it, in the case of using (t) for sheet thickness, W for sheet width, V for rolling velocity and ρ for true density of the powder, the powder supplying quantity per unit time into the rolling roll needed to obtain the thin sheet material having 100% relative density, is ρ.t.W.V. At this time, the powder supplying quantity A per unit time supplied into the gap between the rolling rolls 1, 2 is regulated to A<ρ.t.W.V and further, the powder supplied between the rolling rolls is regulated to <5% existing ratio of the powder having >=2.5 t grain diameter and to <5% existing ratio of the powder having <=0.1 t grain diameter (wherein, the grain diameter of the powder is defined as the min. diameter in the max. length in all directions in the powdery grain in the case of being the amorphous powder).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of rolling a metal powder or the like to produce a thin plate having a thickness of, for example, about 100 microns or less.

[0002]

2. Description of the Related Art Conventionally, it has been practiced to manufacture a rolled powder plate by rolling powder of metal or the like.

FIGS. 7 and 8 show an example of a conventional powder rolling apparatus. Rollers 1 and 2 are provided in parallel in a lateral direction so as to maintain a required rolling interval 4 and the rolling rolls 1 are provided. , 2 and the front and rear plates 3a, 3b extending vertically upward approaching the upper outer peripheral surfaces of the rolling rolls 1, 2 so as to enter the vicinity of the position where the rolling interval 4 is the smallest. Left and right plates 3c, 3d with narrow bottoms
And a box-shaped powder supply hopper 3 comprising: 5,
Reference numeral 6 denotes a shaft of the rolling rolls 1 and 2 which are rotationally driven by the driving motors 5A and 6A, and reference numeral 7 denotes a rolling-down device for adjusting the rolling interval 4 by rolling down the rolling rolls 1 and 2.

In the above-described conventional powder rolling apparatus, when the pair of rolling rolls 1 and 2 are rotated in opposite directions so that the opposing surfaces thereof move downward, the powder in the powder supply hopper 3 is reduced in the rolling interval. 4 is naturally dropped and supplied, and rolled by the rolling rolls 1 and 2 to produce a rolled powder plate. The rolled powder plate thus manufactured is heated and sintered by a heating furnace or the like as necessary.

[0005] In order to manufacture a powder rolled plate having a set plate thickness using the apparatus shown in FIGS. 7 and 8, the thickness t of the powder rolled plate is detected, and
This is performed by controlling the rolling force of the rolling rolls 1 and 2 by the rolling device 7 so that the detected plate thickness t becomes the set thickness.

[0006]

However, the conventional powder rolling machines shown in FIGS. 7 and 8 have various problems as described below.

When the powder is rolled by using a pair of rolling rolls 1 and 2 as in the powder rolling apparatus shown in FIGS. 7 and 8, the effective bite angle for drawing the powder between the rolling rolls 1 and 2 is described. It is known that α (about 5 ° to about 20 °) is always substantially constant regardless of the roll diameter of the rolling rolls 1 and 2. At this time, the effective bite angle α is
The difference between the mutual distance L at the point of intersection with the outer peripheral surface of No. 2 and the plate thickness t of the powder rolled plate, that is, the effective rolling amount Lt is determined.

Therefore, in general, when the thickness t and the relative density of the powder rolled plate to be manufactured are set, the rolling interval 4 between the rolls 1 and 2 and the diameter of the rolls 1 and 2 are selected. Is being addressed by.

From the above, when the powder rolled sheet is to be manufactured thinly, the rolling interval 4 is adjusted to be small. However, simply reducing the rolling interval 4 increases the effective rolling amount Lt. As a result, the rolling load increases, and finally rolling becomes impossible.

Further, if the rolling rolls 1 and 2 having a small diameter are used, the effective rolling reduction can be reduced. However, the rolling rolls 1 and 2 having a small diameter cannot maintain the strength and the roll center axis is bent. In addition, a powder rolled plate having a uniform thickness in the width direction cannot be manufactured.

Therefore, the conventional powder rolling apparatus cannot produce a thin powder rolled sheet with a desired relative density, and in particular, is extremely thin and has a high thickness capable of transmitting liquid or gas or light. It was not possible to produce a porosity sheet material.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and has as its object to provide a method capable of manufacturing a thin plate material capable of uniformly transmitting a liquid, a gas, or light by powder rolling. The purpose is.

[0013]

SUMMARY OF THE INVENTION The present invention relates to a method for producing a thin sheet material by supplying and rolling powder by means of powder supply between rolling rolls provided in pairs, comprising a sheet thickness t, Assuming the sheet width W, the rolling-out sheet speed V, and the true density ρ of the powder, the amount of powder supplied per unit time between the rolling rolls required to obtain a sheet having a relative density of 100% is ρ · t ·
In this case, the powder supply amount A per unit time supplied between the rolling rolls is A <ρ · t · W · V,
In the powder supplied between the rolling rolls, the abundance ratio of powder having a particle size of 2.5 t or more is less than 5%, and the abundance ratio of powder having a particle size of 0.1 t or less is less than 5% (however, Is defined as the smallest one of the maximum lengths in all directions in the powder particles when the powder is in an irregular shape).

[0014] The powder supply means includes: a damper plate which forms an adjustable powder supply interval between the powder supply means and the upper outer peripheral surface of the rolling roll; A powder supply unit for supplying, a vibrator for vibrating the weir plate, and a control device capable of controlling the plate thickness by adjusting the powder supply interval and the vibration of the weir plate, or the powder supply means is a measuring device And a control device capable of controlling the sheet thickness by adjusting the powder supply amount of the conveyor device, and controls the powder supply amount.

Further, a layer thickness detecting sensor for detecting the layer thickness of the powder supplied between the rolling rolls through the powder supply interval is provided to control the supply amount of the powder, May be heated below the melting point.

According to the present invention, the amount of powder supplied per unit time between the rolling rolls required to obtain a thin plate having a relative density of 100% is a plate thickness t, a plate width W, and a rolling exit side plate speed V.
And the true density ρ of the powder, that is, ρ · t · W · V,
Powder supply amount A per unit time supplied between rolling rolls A
If A <ρ · t · W · V, a thin plate material having a small relative density and capable of transmitting liquid, gas or light can be manufactured. Furthermore, since the powder supplied between the rolling rolls is a powder having a particle size close to the plate thickness, there is not enough powder that can enter the gaps between the powder particles, and therefore, becomes a thin plate material having high porosity, It is possible to manufacture a thin plate material having liquid, gas, and light transmittance.

The powder supply means includes a weir plate that forms an adjustable powder supply interval with the upper outer peripheral surface of the rolling roll, and a powder supply unit that supplies powder between the rolling rolls through the powder supply interval of the weir plate. A vibrator for vibrating the weir plate, and a control device capable of controlling the plate thickness, or a powder supply means, a conveyor device equipped with a weighing device, and a control device capable of controlling the plate thickness. With this arrangement, the supply amount of the powder to be supplied between the rolling rolls can be accurately controlled.

Further, when the powder supply amount is controlled by providing a layer thickness detection sensor for detecting the layer thickness of the powder supplied between the rolling rolls through the powder supply interval, the control of the powder supply amount can be performed more accurately. When the powder is heated to a temperature equal to or lower than the melting point by applying a current between the rolling rolls, a thin plate having excellent solidification strength can be manufactured.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an example of a powder rolling apparatus used in the method of manufacturing a thin plate material according to the present invention. In the powder rolling device shown in FIGS. 1 and 2, a pair of rolling rolls 1 and 2 are provided in parallel in a lateral direction so as to maintain a required rolling interval 4. Powder supply means 41 is provided.

The powder supply means 41 is provided between the top of one of the rolling rolls (the left rolling roll 1 in FIG. 1) and the rolling interval 4.
And a weir plate 9 whose lower end is close to the outer peripheral surface to form a powder supply interval 8.

The weir plate 9 is connected to a vibrator 10 that vibrates the weir plate 9. Further, the vibrator 10 is connected to a vibration adjuster 18 capable of arbitrarily adjusting its frequency and amplitude. Further, the weir plate 9 needs to be bent and deformed by the vibration of the vibrator 10, and for this purpose, the weir plate 9 is provided with a bent deformation part 16 above the thick weir plate 9. The bending deformation part 16 in FIG.
A case is shown in which a groove 17 extending in the axial direction is provided to form a thin portion so as to bend easily.

Further, between the top of the one roll 1 and the weir plate 9, there is provided a powder supply unit 11 such as a conveyor capable of supplying a constant amount of powder from the upper side toward the powder supply interval 8. Provided. The powder supply unit 11 can adjust the supply amount of the powder supplied to the powder supply interval 8 by the drive motor 11a. The powder supply unit 11
Can employ various types other than the conveyor.

The weir plate 9 can adjust the powder supply interval 8 formed between its lower end and the outer peripheral surface of the rolling roll 1.

That is, in FIG. 1, a nut 22 provided with an adjusting screw 21 is rotatably mounted on a connecting member 20 mounted on the weir plate 9 and the adjusting screw 21 is screwed thereto. 23 is attached to a fixing member 24, and furthermore, an adjusting motor 26 that rotates the bolt portion 22 via a gear 25 is fixed to the fixing member 24, thereby forming an interval adjusting device 27. In the interval adjusting device 27 in FIG. 1, when the adjusting screw 21 is screwed into the nut 23 by rotating the bolt portion 22, the lower end of the weir plate 9 is separated from the outer peripheral surface of the rolling roll 1 to increase the powder supply interval 8. When the adjusting screw 21 is pulled out from the nut 23, the lower end of the weir plate 9 can be made closer to the outer peripheral surface of the rolling roll 1 so that the powder supply interval 8 can be reduced.

Further, the powder supplied onto the rolling roll 1 is supplied to the rolling interval 4 of the rolling rolls 1 and 2 through the powder feeding interval 8, and the rolling interval along the outer peripheral surface of the rolling roll 1 is changed. 4, the layer thickness M of the powder supplied to the layer 4 is detected by the layer thickness detection sensor 29.
The layer thickness signal 30 detected at is input to a control device 31 described later. As the layer thickness detection sensor 29, an ultrasonic sensor, an electromagnetic induction sensor, or the like can be used.

As described above, the weir plate 9, the interval adjusting device 27 for adjusting the powder supply interval 8 of the weir plate 9, the powder supply unit 11 for supplying powder to the powder supply interval 8, and the weir plate 9 are vibrated. A vibrator 10, a layer thickness detecting sensor 29 for detecting a layer thickness M of the powder supplied to the rolling interval 4 through the powder supplying interval 8, and a control device 31 for controlling the powder supplying means 4.
1 is configured.

The rolling rolls 1 and 2 can control the thickness t of the thin sheet material 14 by changing the rolling interval 4 (rolling amount) by a rolling device 28 composed of a jack or the like.

A power supply 13 may be connected to the rolling rolls 1 and 2 via slip rings 12 provided on the shafts 5 and 6 of the rolling rolls 1 and 2. When an electric current is applied between the rolling rolls 1 and 2, the powder (for example, metal) is rolled while being heated to a melting temperature or lower, and the compacted or sintered thin sheet material 14 can be formed. In this case, either DC or AC can be used as the power supply 13.

Further, the sheet material 14 by the rolling rolls 1 and 2
An inert gas such as nitrogen gas is blown to prevent oxidation of the powder in the vicinity of the rolling interval 4 which becomes a rolling portion of the anti-oxidation device, thereby improving the adhesion of the powder (for example, metal particles). Can be provided. As the antioxidant device 15, a reducing gas such as hydrogen is blown in place of the device in which the inert gas is blown, or the entirety of the rolling rolls 1, 2 and the powder supply unit 11 and the like is sealed. (Not shown), and the sealed container may be connected to a vacuum generator to maintain a vacuum, or an inert gas atmosphere may be used.

Reference numeral 19 denotes a pressing plate disposed near the upper end of the rolling interval 4 on the end surfaces of the rolling rolls 1 and 2, and the pressing plate 19 is pressed against the end surfaces of the rolling rolls 1 and 2 by a pressing device 19A such as a cylinder. Thus, the powder is prevented from leaking from the end faces of the rolling rolls 1 and 2 and falling.

The control device 31 includes a set rolling speed 34
Is input, and the control device 3
The rolling speed signal 32 is output from 1 to the drive motors 5A and 6A to control the rolling speed of the thin plate material 14.

Further, a set plate thickness 35 is input to the control device 31, and a plate thickness control signal 33 is output from the control device 31 to the rolling-down device 28 according to the set plate thickness 35, whereby the rolling interval 4 is controlled. Further, a thickness signal 37 from a thickness detection sensor 36 that detects the thickness t of the thin sheet material 14 to be rolled is input to the control device 31 so that the thickness t is corrected.

In addition, the control device 31 receives a sheet width 42 of the sheet material 14 to be rolled.

Further, the set density 43 is input to the control device 31, and the relative density of the thin plate material 14 is set to the set density 43.
Is controlled so that

That is, the density signal 39 from the density detection sensor 38 for detecting the relative density of the thin plate material 14 is input to the control device 31, and the set density 43 and the density signal 39 are compared. The powder supply interval 8 is adjusted by outputting the interval adjustment signal 44 to the adjustment motor 26 of the adjustment device 27, and the vibration adjustment signal 45 is output to the vibration adjuster 18, so that the The frequency and / or amplitude of the dam plate 9 is controlled via the vibrator 10 by the vibration signal 18a. When the frequency and amplitude of the weir plate 9 are controlled so as to increase, the supply amount of the powder to the rolling interval 4 increases and the layer thickness M increases, and conversely, the frequency and amplitude decrease. The supply amount of the powder to the rolling interval 4 decreases, and the layer thickness M decreases.

The layer thickness M of the powder supplied to the rolling interval 4 through the powder supplying interval 8 is greatly related to the relative density of the sheet material 14, and therefore the layer thickness detected by the layer thickness detecting sensor 29. The signal 30 is input to the control device 31 to correct an interval adjustment signal 44 for controlling the powder supply interval 8 and a vibration adjustment signal 45 for controlling the vibration of the dam 9. When the layer thickness M is not detected, the frequency and amplitude of the dam plate 9 are changed by the thickness signal 37 from the thickness detection sensor 36 to control the amount of powder supplied to the rolling interval 4.

The driving motor 11a of the powder supply unit 11 is controlled by a powder supply signal 40 from the control device so that a required amount of powder always exists between the upper surface of the rolling roll 1 and the weir plate 9.
Is controlled.

The operation of the apparatus shown in FIGS. 1 and 2 will be described below.

The control device 31 controls the input set plate thickness 35.
Is output to the screw-down device 28 based on the above-mentioned formula, and the thickness t (rolling interval 4) is set.

Further, the control device 31 drives the drive motors 5A and 6A by the rolling speed signal 32 based on the input set rolling speed 34 so that the roll surface forming the rolling interval 4 moves downward. In addition to rotating the rolling rolls 1 and 2 at a constant speed, the powder supply signal 40 is output to the drive motor 11a of the powder supply unit 11, and the powder is quantitatively transferred between the one rolling roll 1 and the weir plate 9. Supply.

Further, the control device 31 adjusts the powder supply interval 8 by outputting an interval adjusting signal 44 to the interval adjusting device 27 based on the input set density 43 and controls the vibration adjuster 18 to adjust the vibration. A signal 45 is output, and the vibrator 10 is driven by the vibration signal 18a to drive the weir plate 9
Vibrates.

The powder supplied on the rolling roll 1 passes through a powder feeding interval 8 between the rolling roll 1 and the lower end of the weir plate 9 to form a layer on the rolling roll 1 while being supplied quantitatively to the rolling interval 4. The rolling is performed at the rolling interval 4 between the rolling rolls 1 and 2 rotating at a constant speed to form the thin plate material 14.

In the above description, the sheet thickness t of the thin sheet material 14 to be rolled is detected by the sheet thickness detecting sensor 36, and the detected sheet thickness signal 37 is input to the control device 31 to change the sheet thickness t to the set sheet thickness. The thickness control signal 33 is corrected to be 35.

The set density 43 input to the control device 31 is compared with a density signal 39 from a density detection sensor 38 for detecting the relative density of the thin plate material 14. The thickness control signal 33 output to the adjustment motor 26 is corrected to adjust the powder supply interval 8, and the vibration adjustment signal 45 output to the vibration controller 18 is corrected so that the dam plate 9 by the vibrator 10 is adjusted.
Is adjusted. By adjusting the powder supply interval 8 and the vibration of the weir plate 9, the rolling interval 4
Is controlled.

At this time, since the layer thickness M of the powder on the rolling roll 1 supplied to the rolling interval 4 through the powder supplying interval 8 is greatly related to the relative density of the sheet material 14, the layer thickness detecting sensor The layer thickness signal 30 detected at 29 is transmitted to the control device 31
To correct the interval adjustment signal 44 for controlling the powder supply interval 8 and the vibration adjustment signal 45 for controlling the vibration of the weir plate 9.

According to the above, a very small amount of powder can be stably supplied to the rolling interval 4, so that the level of the powder supplied between the rolling rolls 1 and 2 can be adjusted by adjusting the layer thickness M. X can be easily adjusted to be in the range of the height H up to the point where the narrowest position of the rolling interval 4 and the effective bite angle α intersect the outer peripheral surfaces of the rolling rolls 1 and 2.

As a result, the effective rolling amount can be arbitrarily adjusted, so that the thin plate material 14 which has been impossible in the past can be easily manufactured by powder rolling.

At the time of the above-mentioned rolling, if necessary,
When heat rolling is performed by passing an electric current between the rolling rolls 1 and 2 or oxidation is prevented by blowing an inert gas with an oxidation preventing device 15, the thin plate material 14 having excellent solidification strength is obtained.
Can be manufactured.

According to the above-mentioned method, the thin plate material 14 can be manufactured by powder rolling. However, the plate thickness is very thin, for example, about 100 μm or less, and the liquid, gas or light can be uniformly dispersed. In order to roll the thin sheet material 14 that can be transmitted, it is necessary to further devise.

The present inventors have proposed a thin plate material 14 having a very thin plate thickness of about 100 μm or less and capable of transmitting liquid, gas or light uniformly.
Various tests were conducted to enable the rolling of the steel sheet, and the following findings were obtained.

Ultra-thin sheet material 1 of about 100 microns or less
In order to manufacture No. 4, the rolling interval 4 is adjusted by the rolling-down device 28 so that the target set plate thickness 35 is obtained.
It is necessary to precisely control the amount of powder supplied from the powder supply interval 8 to the rolling interval 4 so that the supply amount is in accordance with the set density 43.

First, assuming a sheet thickness t, a sheet width W, a rolling speed V, and a true density ρ of powder, per unit time between the rolling rolls 1 and 2 required to obtain a sheet having a relative density of 100%. Is the product ρ · t · W · V of these. At this time, assuming that the powder supply amount A per unit time supplied between the rolling rolls 1 and 2 is A <ρ · t · W · V, the relative density is smaller than 100%, and the liquid, gas or light is supplied. The thin plate material 14 that can be uniformly transmitted can be rolled.

In the above description, the relative density of the thin sheet material 14 required by the set density 43 is input to the control device 31, the sheet thickness t is input by the set sheet thickness 35, and the rolling speed V is input by the set rolling speed 34. Since the width W (constant) of the thin plate material 14 is known in advance, its value is input. Further, since the true density ρ of the powder is also known in advance, the value is input, and the density signal from the density detection sensor 38 is input. The powder supply interval 8 of the weir plate 9 is controlled so that 39 corresponds to the set density 43, and the amount of powder supplied to the rolling interval 4 is controlled by controlling the vibration of the weir plate 9.

In the above, since the relative density of the sheet material 14 and the powder supply amount A are in a proportional relationship, when the sheet thickness t, the sheet width W, and the rolling speed V are determined, the required set density 43 is required. The powder supply amount A may be controlled in accordance with the following equation. Further, since the powder supply amount A is greatly related to the layer thickness M of the powder on the rolling roll 1 supplied at the rolling interval 4, the layer thickness M is The thickness signal 30 is detected by the thickness detection sensor 29 and a layer thickness signal 30
Is corrected, the interval adjustment signal 44 for controlling the powder supply interval 8 in the powder supply means 41 and the vibration adjustment signal 45 for controlling the vibration of the weir plate 9 are corrected.
The amount A of powder to be supplied to the device can be controlled with high accuracy.

When the layer thickness detection sensor 29 is not used, the thickness signal 37 from the thickness detection sensor 36 and the density signal 39 from the density detection sensor 38 are used to connect the weir plate 9 and the rolling roll 1. The powder supply amount A is controlled by adjusting the powder supply interval 8 and the vibration (frequency and amplitude) of the weir plate 9.

Further, a thin plate material 1 having an extremely thin plate thickness of about 100 μm or less and capable of transmitting liquid, gas or light uniformly.
In order to produce No. 4, it is important to adjust the particle size of the powder.

That is, when particles having a particle size significantly larger than the rolling interval 4 are present in the powder, the large-sized particles are crushed by rolling to have a very large area, and this portion has a high permeability. Therefore, the thin plate member 14 having uniform transmittance cannot be obtained because the non-transmissive portion does not have the opaque portion.
In addition, when a large number of particles having a particle diameter significantly smaller than the rolling interval 4 are present, the small-diameter particles enter between the large-diameter particles during rolling and are condensed, so that sufficient permeability is obtained. Cannot be obtained.

In general, in order to adjust the particle size of a powder having an irregular shape, it is necessary to first define the particle size of the powder.
The particle size of a particle is defined as the smallest of its maximum lengths in all directions. That is, as shown in FIG. 3, the particle 46 is sliced in parallel in the plane in the X direction, and the maximum length (diameter) of each slice is measured. Subsequently, the particles 46 are sliced in parallel in the plane in the Y direction, and the maximum length (diameter) in each slice is measured. Further, the particles 46 are sliced in parallel in the plane in the Z direction, and the maximum length (diameter) in each slice is measured. Further, the same measurement as described above is performed in all directions other than X, Y, and Z.

The smallest one of the maximum lengths in all directions thus measured is defined as the particle size of the particle 46. For example, when the maximum length in the Z direction of the particle 46 in FIG. 3 is the smallest, the maximum length in the Z direction is defined as the particle size of the particle 46.

Next, the upper and lower limits of the particle size of the powder are set. First, in order to set the upper limit of the particle diameter, an appropriate number of the particles having the largest diameter are selected from the powder to be supplied, and FIG.
The particle size of each particle is measured by the method shown in (1), and the largest particle size among the selected particle sizes is determined as the maximum particle size.

Further, an appropriate number of particles having the smallest diameter is selected from the powder to be supplied, the particle diameter of each particle is measured by the method shown in FIG. 3, and the smallest one of the selected particles is determined. Let it be the minimum particle size.

Experiments and investigations on the particle size of the powder when producing the thin plate material 14 showed that the proportion of the powder having a particle size of 2.5 t or more was less than 5% and the presence of the powder having a particle size of 0.1 t or less was present. As shown in FIG. 5, it was found that the use of the powder adjusted so that the ratio was less than 5% could produce a good thin plate material 14.

In the above, the particle size of the powder is adjusted so that the proportion of powder having a particle diameter of 2.5 t or more is less than 5% and the proportion of powder having a particle diameter of 0.1 t or less is less than 5%. The adjustment can be made by first passing the powder through a mesh D sieve to remove the mesh, and then passing the powder under the mesh through a sieve of the mesh d to remove the mesh.

An ordinary powder has a particle size distribution as shown in FIG. 4, for example. In FIG. 4, the thin plate material 1 having a plate thickness t of 100 μm
In order to roll No. 4, coarse particles on the net shown by hatching are removed by a 250-μm mesh D sieve, and then, fine particles below the mesh shown by hatching are removed from the powder under the mesh by a 10-μm mesh d sieve. So that 1
A powder having a particle size range of 0 μm to 250 μm can be adjusted.

As described above, the particle size of the powder is set to 2.5 t
When rolling is performed using powder adjusted such that the abundance ratio of the powder having the above particle size is less than 5% and the abundance ratio of the powder having the particle size of 0.1 t or less is less than 5%, uniform permeability can be obtained. With
In addition, the thin plate material 14 having an arbitrary relative density can be favorably manufactured.

FIG. 6 shows the powder supply means 4 shown in FIG.
6 shows another example of the powder supply means 4 shown in FIG.
Reference numeral 7 denotes a conveyor device 48, a rotation detector 50 of a drive motor 49, a powder cutting plate 51 provided on the conveyor device 48, and a weighing device 52 such as a piezoelectric element for measuring the weight of the powder on the conveyor device 48. A weighing device consisting of
At this time, for example, it is effective to form a shallow groove on the conveyor surface of the conveyor device 48 so that a small amount of powder can be supplied reliably.

In the apparatus shown in FIG. 6, when the distance between the conveyor device 48 and the scraping plate 51 is adjusted and the number of rotations of the drive motor 49 is controlled so that the detection value of the weighing scale 52 becomes a predetermined value, the rolling The amount of powder supplied to the rolling interval 4 of the rolls 1 and 2 can be adjusted with high precision, and thus, as in the case of FIGS. 1 and 2, the thin plate material 14 having a thin and uniform permeability can be manufactured. can do.

It should be noted that the present invention is not limited to the above-described embodiment, and that the powder supply means may employ various methods other than those shown in the drawings, and various other means may be used without departing from the scope of the present invention. It goes without saying that changes can be made.

[0070]

According to the present invention, the amount of powder supplied per unit time between the rolling rolls required to obtain a sheet having a relative density of 100% is determined by the sheet thickness t, the sheet width W, the rolling speed V, Since the product of the true density ρ of the powder, that is, ρ · t · W · V, the powder supply amount A per unit time supplied between the rolling rolls is A <ρ
By setting t · W · V, a thin plate material having a small relative density and capable of transmitting liquid, gas, or light can be manufactured. Further, the particle size of the powder is adjusted so that the abundance ratio of the powder having a particle size of 2.5 t or more is less than 5% and the abundance ratio of the powder having a particle size of 0.1 t or less is less than 5%. Thereby, the powder will be rolled with a substantially uniform relative density,
There is an effect that a thin plate material having uniform permeability can be manufactured.

Further, the powder supply means includes a weir plate that forms an adjustable powder supply interval with the upper outer peripheral surface of the rolling roll, and a powder supply that supplies powder between the rolling rolls through the powder supply interval of the weir plate. Or a vibrator for vibrating the weir plate, and a control device capable of controlling the plate thickness, or a conveyor device provided with a weighing device for the powder supply means, and a control device capable of controlling the plate thickness With such a configuration, there is an effect that the supply amount of the powder supplied between the rolling rolls can be accurately controlled.

Further, when the powder supply amount is controlled by providing a layer thickness detection sensor for detecting the layer thickness of the powder supplied between the rolling rolls through the powder supply interval, the powder supply amount can be controlled more accurately. When the powder is heated to a temperature equal to or lower than the melting point by applying a current between the rolling rolls, a thin sheet having excellent solidification strength can be produced.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an example of a powder rolling device used in the method of the present invention.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is an explanatory diagram showing definitions of a maximum particle size and a minimum particle size.

FIG. 4 is a diagram showing an example of a particle size distribution of a powder and a maximum particle size and a minimum particle size.

FIG. 5 is a cross-sectional view showing an example of a sheet material rolled with powder whose particles have been adjusted.

FIG. 6 is a schematic side view showing another example of the powder supply means.

FIG. 7 is a schematic side view showing an example of a conventional powder rolling device.

FIG. 8 is a plan view of FIG. 7;

[Explanation of symbols]

 1, rolling roll 4 rolling interval 8 powder supply interval 9 weir plate 10 vibrator 11 powder supply unit 14 thin plate material 29 layer thickness detection sensor 31 controller 41 powder supply means 47 powder supply means 48 conveyor device 50 rotation detector (measuring device) 51 51 Cut-off plate (weighing device) 52 Weight scale (weighing device) M Layer thickness D Maximum particle size d Minimum particle size

 ──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Akihiro Nomura 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawajima-Harima Heavy Industries, Ltd. F-term (reference) 4K018 BB04 CA38 HA08

Claims (5)

[Claims] 1. A method for producing a thin sheet material by supplying and rolling powder by means of powder supply between rolling rolls provided in pairs, comprising: a sheet thickness t, a sheet width W, and a rolling exit side sheet speed. V, relative density of powder, 100% relative density ρ
The amount of powder supplied per unit time between the rolling rolls required to obtain a thin sheet material of ρ · t · W · V is:
Powder supply amount A per unit time supplied between rolling rolls A
Is A <ρ · t · W · V, and the powder supplied between the rolling rolls has an abundance ratio of powder having a particle size of 2.5 t or more of 5
%, The abundance ratio of powder having a particle size of 0.1 t or less is less than 5% (however, when the powder has an irregular shape,
A maximum length in all directions in the powder particles is defined as a minimum length). 2. A dam plate, wherein the powder supply means forms an adjustable powder supply interval with an upper outer peripheral surface of a rolling roll;
A powder supply unit that supplies powder between rolling rolls through a powder supply interval of the weir plate, and a vibrator that vibrates the weir plate,
2. The method according to claim 1, further comprising the step of: controlling a powder supply amount by providing a control device capable of controlling a plate thickness by adjusting a powder supply interval and a vibration of the weir plate. 3. A powder supply means comprising: a conveyor device provided with a metering device; and a control device capable of adjusting a powder supply amount of the conveyor device to control a plate thickness to control a powder supply amount. The method for producing a thin plate material according to claim 1, wherein: 4. The thin film feeder according to claim 3, further comprising a layer thickness detection sensor for detecting a layer thickness of the powder supplied between the rolling rolls through the powder supply interval to control the supply amount of the powder. The method of manufacturing plate materials. 5. The method for producing a thin sheet material according to claim 1, wherein a current is applied between the rolling rolls to heat the powder to a temperature equal to or lower than a melting point.