JP2002173705A - Method and equipment for powder rolling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformize thickness also at the tip in an axial direction and to attain the prevention of reduction in yield and the improvement of production efficiency. SOLUTION: After powder is supplied, within the prescribed range L in an axial direction, to a rolling mill roller A rotating around the center axis CA, the powder is rolled between the rolling mill roller A and a second rolling mill roller B. The powder on the tip T in the axial direction in the above prescribed range L is removed, and then the rolling is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder rolling method and a powder rolling apparatus for producing a sheet material by rolling a metal powder or the like between rolls.

[0002]

2. Description of the Related Art As a method for producing a metal sheet, a method of repeatedly rolling an ingot, a method of producing the sheet by electrolytic deposition, and a method of rolling a metal powder are generally known. Conventionally, as a method of manufacturing a sheet material from a metal powder, a normal powder rolling method in which the metal powder is stored in a rolling roll, and the rolling roll is rotated around an axis so as to be drawn between the rolling rolls and rolled, A method of rolling using a doctor blade for supplying a fixed amount of powder is often used.

[0003] Among these, in the method of rolling metal powder, the metal powder is supplied to a rolling roll by a powder supply device, but the width of the sheet material to be produced is adjusted by the supply width of the metal powder. .

[0004]

However, the conventional powder rolling apparatus and powder rolling method as described above include:
The following problems exist. As shown in FIG. 9, the metal powder P supplied onto the rolling roll A from the powder supply device 21 is affected by the influence of the poor thickness distribution at the end of the powder supply device itself and the friction with the side portion 21a. The supply amount at both ends T in the core direction is often smaller than that at the center.
Therefore, the thickness of the rolled sheet material becomes uneven particularly at both ends in the axial direction, and it is necessary to separately cut both ends after the rolling process. Therefore, there is a problem that the production efficiency is reduced and the yield is deteriorated. In addition, since the ends of the cut sheet material are rolled and sintered, there is a problem that recycling is difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has a uniform thickness at an axial end, thereby preventing a decrease in yield and improving production efficiency. An object is to provide a rolling method.

[0006]

In order to achieve the above object, the present invention employs the following constitution. The powder rolling method according to claim 1, wherein the powder is supplied in a predetermined range in the axial direction to a rolling roll rotating about an axis, and then the powder is rolled between the rolling roll and a second rolling roll. A powder rolling method, characterized in that the powder is removed from the end portion in the axial direction in the predetermined range, and the powder is rolled.

[0007] Therefore, in the powder rolling method of the present invention, since the powder in the central portion having a uniform thickness in the predetermined range can be rolled, there is no need to separately provide a step of cutting the end portion after the rolling step, and the production efficiency is reduced. Can be prevented. Further, since the powder to be removed is before rolling and sintering, it can be used again in the rolling process as it is.

[0008] The powder rolling method according to the second aspect is the first aspect of the invention.
In the powder rolling method described above, the second rolling roll is shifted in the axial direction with respect to the predetermined range.

Therefore, according to the powder rolling method of the present invention, the powder in the predetermined range, which is shifted from the second rolling roll and located at the axial end, is rolled between the rolling roll and the second rolling roll. At this time, it can be dropped and removed.

The powder rolling method according to the third aspect is the first aspect of the invention.
In the powder rolling method described above, a length of the second rolling roll in the axial direction is shorter than the predetermined range.

Therefore, according to the powder rolling method of the present invention, when the powder at both ends located outside the second rolling roll in the predetermined range is rolled between the rolling roll and the second rolling roll, Can be dropped and removed.

[0012] The powder rolling method according to the fourth aspect is the first aspect of the invention.
In the powder rolling method described above, the length of the rolling roll in the axial direction is shorter than the predetermined range.

Therefore, according to the powder rolling method of the present invention, the powder at both ends located outside the rolling roll in the predetermined range can be dropped and removed when supplying the powder to the rolling roll.

According to a fifth aspect of the present invention, in the powder rolling method, the powder is supplied in a predetermined range in the axial direction to a rolling roll rotating around the axis, and then the powder is fed between the rolling roll and the second rolling roll. A powder rolling method for rolling powder, wherein a groove is formed along an end of the powder supplied on the rolling roll, at an end of the powder in the axial direction.

Therefore, according to the powder rolling method of the present invention, the end portion in the axial direction can be easily separated and removed after the powder is rolled. Although the removed powder on the side of the end is rolled, it is before the next step such as sintering, so that it can be easily reused after sintering.

According to a sixth aspect of the present invention, in the powder rolling apparatus, the powder is rolled between a rolling roll that rotates around an axis and supplies powder in a predetermined range in the axial direction, and the rolling roll. A powder rolling device including a second rolling roll,
It is characterized by having a powder removing section for removing the powder at the axial end of the predetermined range.

Therefore, in the powder rolling device of the present invention, the powder on the central side having a uniform thickness in the predetermined range can be rolled, so that it is not necessary to separately provide a step of cutting the end portion after the rolling step, and the production efficiency decreases. Can be prevented. Further, since the powder to be removed is before rolling and sintering, it can be used again in the rolling process as it is.

According to a seventh aspect of the present invention, there is provided a powder rolling apparatus.
In the powder rolling apparatus described above, the powder removing unit is the second rolling roll that is arranged to be shifted in the axial direction with respect to the predetermined range.

Therefore, in the powder rolling device of the present invention, the powder in the range located at the end in the axial direction and shifted from the second rolling roll in the predetermined range is rolled between the rolling roll and the second rolling roll. At this time, it can be dropped and removed.

[0020] The powder rolling apparatus according to the eighth aspect is the sixth aspect of the present invention.
In the above powder rolling device, the powder removing section is the second rolling roll formed to have a length in the axial direction shorter than the predetermined range.

Therefore, in the powder rolling device of the present invention, when the powder at both ends located outside the second rolling roll in the predetermined range is rolled between the rolling roll and the second rolling roll, Can be dropped and removed.

The powder rolling apparatus according to the ninth aspect is the sixth aspect of the invention.
In the powder rolling device described above, the powder removing section is the rolling roll formed to have a length in the axial direction shorter than the predetermined range.

Therefore, in the powder rolling device of the present invention, the powder at both ends located outside the rolling rolls in the predetermined range can be dropped and removed when supplying the powders to the rolling rolls.

According to a tenth aspect of the present invention, in the powder rolling apparatus according to the sixth aspect, the powder removing unit is configured to move the shaft of the powder supplied onto the rolling roll so as to be movable in the axial direction. It is a slitter for guiding the end in the core direction to the outside from above the rolling roll.

Therefore, in the powder rolling device of the present invention, the powder at both ends located outside the slitter within the predetermined range can be guided to the outside and removed. Moreover, in the powder rolling device of the present invention, the range for removing the powder can be easily changed from the predetermined range.

The powder rolling apparatus according to the eleventh aspect of the present invention rolls the powder between a rolling roll that rotates about an axis and supplies powder in a predetermined range in the axial direction, and the rolling roll. A powder rolling device provided with a second rolling roll, wherein the powder supplied onto the rolling roll has a groove along the axial end movably in the axial direction on the axial end side. Characterized by having a groove forming portion for forming

Therefore, with the powder rolling device of the present invention, after rolling the powder, it is possible to separate and remove the end side from the groove. Although the removed powder on the side of the end is rolled, it is before the next step such as sintering, so that it is easy to reuse the powder after sintering. Further, in the powder rolling device of the present invention, the position where the groove is formed, that is, the range in which the powder is removed can be easily changed from the predetermined range.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of a powder rolling apparatus and a powder rolling method according to the present invention will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of the powder rolling device 1. The powder rolling device 1 includes a pair of a horizontal and parallel rolling roll A and a rolling roll (second rolling roll) B, and is disposed above the rolling roll A, and includes a guide unit 2.
And a powder supply device 3 for supplying a metal powder (powder, powder) through the rolls A and B, and a lower surface between the rolling rolls A and B for guiding a rolled sheet material (foil) to the next step. An arcuate sheet guide 5 is provided.

As shown in FIG. 2, the rolling rolls A and B are:
The shafts CA and CB arranged in parallel are controlled so as to be independently rotatable around each other and to rotate synchronously at the same speed. Further, the rolling roll B can be moved along the axis CB by the horizontal moving mechanism 6 as a powder removing unit. Further, the gap between the rolling rolls A and B is adjustable so that the thickness of the rolled sheet material can be arbitrarily changed.

The powder supply device 3 supplies the metal powder onto the rolling roll A with a predetermined feeding width (range) L. The rolling roll A (and B) is formed to be slightly longer than the feeding width L. Have been. In addition, the length of the rolling roll A may be the same as the supply width L.

A procedure for producing a sheet material from metal powder by the powder rolling apparatus 1 having the above-described configuration will be described. Here, the metal powder is rolled with a rolling width L1. First, the horizontal moving mechanism 6 is driven, and as shown in FIG. 2, the rolling roll B is moved relative to the feeding width L so that the overlap length between the powder feeding width L and the rolling roll B becomes the rolling width L1. Distract.

Subsequently, when the metal powder is supplied from the powder supply device 3 onto the rolling roll A, the metal powder having the rolling width L1 is rolled between the rolling roll B. On the other hand, of the supply width L, the metal powder in the range T located at the end in the axial direction, which is shifted from the rolling width L1, falls downward and is removed. The removed metal powder is recovered by a recovery mechanism (not shown),
Will be used again. Then, the sheet material roll-formed to a desired thickness between the rolling rolls A and B is sent to the next step (for example, a sintering step) along the sheet guide 5.

In the powder rolling method and the powder rolling apparatus according to the present embodiment, the rolling is performed after removing the metal powder in the range T located at the end in the axial direction, which is shifted from the rolling width L1 in the supply width L, A sheet material having a uniform thickness can be obtained. Therefore, it is not necessary to separately provide a step of cutting the sheet material after rolling, which can contribute to prevention of deterioration in yield and improvement in production efficiency. Further, in the present embodiment, since the metal powder in the range T is removed and collected before rolling and sintering, the collected powder can be reused as it is, which can contribute to cost reduction.

In addition, in the present embodiment, the rolling roll B
By moving in the direction of the axis CB, the rolling width L1 can be arbitrarily set as shown in FIG. 3, so that a sheet material having a uniform thickness and various widths can be easily obtained. .

FIG. 4 is a view showing a second embodiment of the powder rolling apparatus and the powder rolling method according to the present invention. In this figure, the same components as those of the first embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals, and description thereof will be omitted. The difference between the second embodiment and the first embodiment is the length of the rolling roll B.

In this embodiment, as shown in FIG. 4, the length of the rolling roll B in the direction of the axis CB is shorter than the powder supply width L and both ends are located inside the supply width L. Have been. In this case, the length of the rolling roll B is set to the rolling width L1. The length of the rolling roll A is shown in FIG.
Is formed to be the same as the supply width L, but may be L or more.

In the present embodiment, in addition to obtaining the same effects as those of the first embodiment, after removing the metal powders in the ranges T, T located at both end portions of the powder supply width L, Since the rolling is performed, a sheet material having a uniform thickness including both end portions can be obtained.

FIG. 5 is a diagram showing a third embodiment of the powder rolling apparatus and the powder rolling method according to the present invention. In this figure, the same components as those of the first embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals, and description thereof will be omitted. The difference between the third embodiment and the first embodiment is that a slitter is provided as a powder removing unit.

As shown in FIG. 5, on both sides of the rolling roll A, slitters 7 are provided as powder removing units. The base end of each slitter 7 is located outside the rolling roll A, and the base end is located downstream of the front end in the metal powder supply direction. In addition, each slitter 7
Is movable along the axis CA direction by the moving mechanism 8. The length of the rolling rolls A and B is shown in FIG.
Is formed to be the same as the supply width L, but may be L or more.

In the powder rolling apparatus having the above-described configuration, first, the moving mechanisms 8 are driven to move the respective slitters 7 so that the distance between the slitters 7 becomes the rolling width L1.
When the metal powder is supplied onto the rolling roll A, both ends of the supply width L are guided to the outside of the rolling roll A by the slitters 7 and removed. Therefore, the sheet material having the rolling width L1 is roll-formed between the rolling rolls A and B.

In the present embodiment, as in the first embodiment, a sheet material having a uniform thickness can be obtained, so that it is possible to contribute to prevention of deterioration in yield and improvement of production efficiency, and to recovery. The used powder can be reused as it is, which can contribute to cost reduction. Also, since the slitters 7, 7 are movable in the axial direction,
The range in which the powder is removed, ie, the product width, can be easily changed.

FIG. 6 is a view showing a fourth embodiment of the powder rolling apparatus and the powder rolling method according to the present invention. In this figure, the same elements as those of the third embodiment shown in FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted. The difference between the fourth embodiment and the third embodiment is that a cutter is provided instead of the slitter.

As shown in FIG. 6, cutters (groove forming portions) 9 are provided on both sides of the rolling roll A, respectively. Each of the cutters 9 is arranged with its cutting edge facing upstream in the metal powder supply direction. Also, each cutter 9
The moving mechanism 10 can move along the axis CA. In addition, the length of the rolling rolls A and B is formed to be the same as the supply width L in FIG. 6, but may be L or more.

In the powder rolling apparatus having the above configuration, first, the moving mechanisms 10 and 10 are driven to move the cutters 9 and 9 so that the distance between the cutters 9 and 9 becomes the product width L1.
Then, when the metal powder is supplied onto the rolling roll A, a groove is formed along the end along the end with the supply of the metal powder.
The rolls A and B are roll-formed in a state formed by the above. Then, of the rolled metal powder, the width L1
Is sent to the next process as a product, and the width L2, L3
Are separated and collected for reuse.

In the present embodiment, since grooves are formed in the metal powder before rolling, even after rolling, by separating and removing the metal powder on both sides, a sheet material having a uniform thickness can be obtained. Since it can be obtained, it can contribute to prevention of deterioration in yield and improvement in production efficiency. Further, in the present embodiment, although both end portions are rolled, since they are before the next step such as sintering, they can be reused more easily than those after sintering. Further, since the cutters 9 and 9 are movable in the axial direction, the range for removing the powder, that is, the product width can be easily changed.

FIG. 7 is a view showing a fifth embodiment of the powder rolling apparatus and the powder rolling method according to the present invention. In this figure, the same components as those of the first embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals, and description thereof will be omitted. The difference between the fifth embodiment and the first embodiment is that the rolling roll A is a powder removing unit.

As shown in FIG. 7, the length L1 of the rolling rolls A and B in the axial direction is set such that a gap is formed at each of both end portions with respect to the metal powder supply width L of the powder supply device 3. It is formed short. In addition, the length of the rolling roll B may be larger than the length L1 of the rolling roll A.

In the powder rolling apparatus having the above-described configuration, of the metal powder supplied from the powder supply apparatus 3, a range of the length L1 supplied onto the rolling roll A is roll-formed with the rolling roll B. . Then, of the supply width L, the metal powder in a range T located on both side ends deviating from the rolling roll A is dropped and collected without being supplied to the rolling roll A.

That is, in the present embodiment, the length L1 of the rolling roll A becomes the rolling width, and a sheet material having a uniform thickness including both side end portions is obtained as in the first embodiment. Therefore, it is possible to contribute to prevention of deterioration of the yield and improvement of the production efficiency, and it is possible to reuse the collected powder as it is, thereby contributing to cost reduction.

In each of the above embodiments, the metal powder supplied from the powder supply device 3 is directly rolled by the rolling rolls A,
Although it was configured to perform rolling between B, the present invention is not limited to this. For example, as shown in FIG.
It is also possible to provide a pre-press roll 4 for pre-pressing the metal powder supplied from above to the roll A with the roll. In this case, the metal powder is degassed by pre-pressing, and adheres (sticks) to the outer peripheral surface of the rolling roll A with a constant thickness (density) and a relative speed of almost zero.
Therefore, between the rolling rolls A and B, a metal powder having a constant thickness is supplied in a fixed amount. Therefore, a sheet material having a smaller thickness than normal powder rolling can be obtained,
The width of the sheet material can be easily adjusted.

Further, in the above embodiment, the rolling rolls A and B are arranged horizontally, but the rolling roll B can be installed at a range of 0 to 85 ° above the center of the rolling roll A. It is. Further, although the description has been made on the assumption that metal powder is used as the powder, the present invention is also applicable to powder of other materials.

[0052]

As described above, the powder rolling method according to the first aspect is a procedure in which rolling is performed after removing the powder at the end in the axial direction within the predetermined range for supplying the powder. Thereby, in this powder rolling method, since a sheet material having a uniform thickness can be obtained, it is not necessary to separately provide a step of cutting the sheet material after rolling, and it is possible to prevent a decrease in yield and to improve production efficiency. As well as contributing, the powder before rolling and sintering is collected, so that the collected powder can be reused as it is, and the effect of contributing to cost reduction is obtained.

The powder rolling method according to the second aspect is a procedure in which the second rolling roll is shifted in the axial direction with respect to a predetermined range. Thereby, in this powder rolling method, there is an effect that a sheet material having a uniform thickness can be obtained by removing the powder located at the end in the axial direction, which is shifted from the second rolling roll in the predetermined range. .

The powder rolling method according to claim 3 is configured such that the length of the second rolling roll in the axial direction is shorter than a predetermined range. Thereby, in this powder rolling method, an effect that a sheet material having a uniform thickness can be obtained by removing powder located at the axial end portion of the difference between the predetermined range and the length of the second rolling roll. To play.

According to a fourth aspect of the present invention, the length of the rolling roll in the axial direction is shorter than a predetermined range. Thus, in this powder rolling method, since the powder is supplied to the rolling rolls with a uniform thickness, there is an effect that a sheet material having a uniform thickness can be obtained.

The powder rolling method according to the fifth aspect is a procedure in which a groove is formed along the end of the powder supplied onto the rolling roll at the end in the axial direction. As a result, in this powder rolling method, the powder on both sides is separated and separated even after rolling.
By removing, a sheet material having a uniform thickness can be obtained, and it is possible to obtain an effect that it can be easily reused as compared with a sintered material.

According to a sixth aspect of the present invention, in the powder rolling device, the powder removing section removes the powder at the axial end portion within the predetermined range. As a result, in this powder rolling device, a sheet material having a uniform thickness can be obtained, so that it is not necessary to separately provide a step of cutting the sheet material after rolling, and it is possible to prevent a decrease in yield and improve production efficiency. As well as contributing, the powder before rolling and sintering is collected, so that the collected powder can be reused as it is, and the effect of contributing to cost reduction is obtained.

The powder rolling apparatus according to the seventh aspect is configured so that the powder at the axial end portion is removed by the second rolling roll which is displaced in the axial direction with respect to the predetermined range. Thereby, in this powder rolling device, there is an effect that a sheet material having a uniform thickness can be obtained by removing the powder located at the axial center end that is shifted from the second rolling roll in the predetermined range. .

The powder rolling apparatus according to the eighth aspect is configured such that the powder at the axial end portion is removed by the second rolling roll having a length in the axial direction shorter than a predetermined range. Thereby, in this powder rolling device, the sheet material having a uniform thickness can be obtained by removing the powder located at the axial end portion of the difference between the predetermined range and the length of the second rolling roll. To play.

According to a ninth aspect of the present invention, there is provided a powder rolling apparatus configured to remove powder at an end in the axial direction by a rolling roll having a length in the axial direction shorter than a predetermined range. Thereby, in this powder rolling device, since the powder is supplied to the rolling rolls with a uniform thickness, there is an effect that a sheet material having a uniform thickness can be obtained.

According to a tenth aspect of the present invention, there is provided a powder rolling apparatus in which the slitter is movable in the axial direction and guides the end of the powder supplied onto the rolling roll in the axial direction to the outside from the rolling roll. ing. Thereby, in this powder rolling device, since the end of the powder is removed to the outside, a sheet material having a uniform thickness can be obtained, and the range of removing the powder, that is, the product width can be easily changed. .

[0062] In the powder rolling apparatus according to the eleventh aspect, the groove forming portion is movable in the axial direction, and a groove is formed along the end portion on the axial direction end side of the powder supplied on the rolling roll. It is configured to be formed. Thereby, in this powder rolling device, the sheet material having a uniform thickness can be obtained by separating and removing the powder at the end even after the rolling, and compared with the one after sintering. And the product width can be easily changed.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a powder rolling device.

FIG. 2 is a diagram showing the first embodiment of the present invention, and is a plan view of rolling rolls that are arranged so as to be shifted in the axial direction.

FIG. 3 is a plan view of rolling rolls that are arranged so as to be shifted in a coaxial center direction.

FIG. 4 is a plan view of a rolling roll according to a second embodiment of the present invention.

FIG. 5 is a view showing a third embodiment of the present invention, and is a plan view in which a slitter is provided on a rolling roll.

FIG. 6 is a view showing a fourth embodiment of the present invention, and is a plan view in which a cutter is provided on a rolling roll.

FIG. 7 is a plan view of a roll and a powder supply device according to a fifth embodiment of the present invention.

FIG. 8 is a schematic configuration diagram of a powder rolling device of another embodiment.

FIG. 9 is a model diagram for explaining an example of a conventional powder rolling method.

[Explanation of symbols]

 A Rolling roll (powder removing section) B Rolling roll (second rolling roll, powder removing section) CA, CB shaft core L Supply width (predetermined range) 1 Powder rolling device 7 Slitter (powder removing section) 9 Cutter (groove forming section) )

Claims (11)

[Claims] 1. A powder rolling method comprising: supplying powder in a predetermined range in the axial direction to a rolling roll rotating about an axis, and then rolling the powder between the rolling roll and a second rolling roll. A powder rolling method, wherein the powder is rolled by removing the powder at the axial end portion of the predetermined range. 2. The powder rolling method according to claim 1, wherein the second rolling roll is shifted in the axial direction with respect to the predetermined range. 3. The powder rolling method according to claim 1, wherein a length of the second rolling roll in the axial direction is shorter than the predetermined range. 4. The powder rolling method according to claim 1, wherein the length of the rolling roll in the axial direction is shorter than the predetermined range. 5. A powder rolling method comprising: supplying powder in a predetermined range in the axial direction to a rolling roll rotating around an axis, and then rolling the powder between the rolling roll and a second rolling roll. A powder rolling method, characterized in that a groove is formed along the end of the powder supplied on the rolling roll, at the end of the powder in the axial direction. 6. A rolling roll that rotates around an axis and supplies powder in a predetermined range in the axis direction, and a second rolling roll that rolls the powder between the rolling roll. A powder rolling device, comprising: a powder removing unit that removes the powder at an end in the axial direction within the predetermined range. 7. The powder rolling device according to claim 6, wherein the powder removing section is the second rolling roll that is arranged to be shifted in the axial direction with respect to the predetermined range. Rolling equipment. 8. The powder rolling device according to claim 6, wherein the powder removing section is the second rolling roll formed to have a length in the axial direction shorter than the predetermined range. Powder rolling equipment. 9. The powder rolling device according to claim 6, wherein the powder removing section is the rolling roll formed to have a length in the axial direction shorter than the predetermined range. apparatus. 10. The powder rolling device according to claim 6, wherein the powder removing section rolls the end of the powder supplied on the rolling roll in the axial direction so as to be movable in the axial direction. A powder rolling device, which is a slitter that guides the roll to the outside. 11. A rolling roll that rotates around an axis and supplies powder in a predetermined range in the axis direction, and a second rolling roll that rolls the powder between the rolling roll. A powder rolling device, comprising: a groove forming portion that is movable in the axial direction and forms a groove along the end portion on the axial end side of the powder supplied on the rolling roll. A powder rolling device, characterized in that: