JPS6389604A - Method and device for rolling powder - Google Patents

Abstract

PURPOSE:To stably form a powder plate which has a high powder density and does not generate cracking, etc. by supplying powder to the spacing between twin roll type rolling rolls while acting a pressure thereto and exerting resistance to the powder plate being molded to act a compressive stress thereon. CONSTITUTION:The powder is supplied to the spacing between the juxtaposed rolling rolls 1 and 2 while the pressure P is kept exerted thereto by a pressure feeding device consisting of a pressure vessel 4 and a pressurizing head 5. The powder 5 is compressed to a high density by the frictional force generated as the rolls 1, 2 rotate and the above-mentioned pressure P, by which the powder plate 7 is rolled and formed. Pinch rolls 8, 9 to pinch the plate 7 are disposed and the rotating speeds thereof are so adjusted that the circumferential speed V1 of the rolls 8, 9 is kept lower than the circumferential speed V2 of the rolls 1, 2. Upward force F is thereby generated in the plate 7 by which the compressive stress toward the rolling and forming part A of the rolls 1, 2 is acted on the powder plate.

Description

Detailed Description of the Invention [Field of Industrial Application] % The present invention relates to a powder rolling method and apparatus for rolling powder of metal or the like to obtain a rolled plate.

[Prior art J Figure 2 shows an example of a conventional method of forming a powder plate by powder rolling. A hopper d provided on roll-type rolling rolls b and c supplies rolling roll b.

The friction force caused by the rotation of C causes powder a to powder plate e to be directly rolled and formed one after another.

Moreover, the powder plate e formed by rolling as described above is rarely used as is, but is generally sintered in a heating furnace to improve the strength of the compact through metal bonding, and then subjected to finish rolling. It is rolled and formed into a practical plate using a machine.

[Problems to be Solved by the Invention] However, in the conventional powder plate rolling method described above, powder a is simply supplied between rolling rolls b and c, and the rolling rolls b and
The molding is performed only by the rotation of c. The powder density of the powder plate e was small, and the density easily fluctuated and was unstable, which caused problems such as the powder plate e cracking, and it was not possible to obtain a sufficient conveying strength of the powder plate e.

The present invention was made by focusing on the problems of the conventional method described above, and when directly forming a powder plate from powder using twin rolls, by increasing the compressive stress at the rolling forming part, The purpose is to form dense powder plates.

[Means for Solving the Problems] The present invention was made in an attempt to solve the above-mentioned technical problem, and is a method for directly rolling a plate from powder using twin rolling rolls. Powder rolling is characterized in that the powder is supplied to the rolling forming part of the rolling roll while being applied, and at the same time, a compressive stress directed toward the rolling forming part is applied by applying resistance to the powder plate formed by the rolling roll. The present invention relates to a method and an apparatus.

[Function] By applying pressure to the powder supplied between the twin rolling rolls and providing resistance to the exit side of the powder plate to be rolled and formed, a large compressive force is generated in the part where the powder is rolled and formed by the rolling rolls. let

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the present invention, which includes a pressurized container 4 for supplying powder 3 between rolling rolls 1 and 2 arranged in parallel;
A pressurizing supply device 6 consisting of a pressurizing rod 5 is provided to apply a pressure P to the powder 3 in the pressurizing container 4 from above. Further, the pressurized supply device 6 may have the pressurized container 4 of an airtight structure, and apply the pressure P to the powder 3 by applying gas pressure to the airtight container.

Furthermore, the exit side (lower side) of the powder plate 7 of the rolling roll 1.2
Pinch rolls 8 and 9 are provided to pinch the powder plate 7 and whose rotational speed can be adjusted.

As described above, by supplying the powder 3 between the rolling rolls 1.2 while applying the pressure P using the pressurizing supply device 6, the pressure P and the rolling roll 1 can be adjusted.

The powder plate 7 is compressed to a high density by the frictional force caused by the rotation of the powder plate 7, and is rolled and formed.

Furthermore, by adjusting the rotational speed of the pinch rolls 8 and 9 so that the circumferential speed v1 of the pinch rolls 8 and 9 that sandwich the powder plate 7 is smaller than the circumferential speed V2 between the rolling rolls 1.2, the powder plate A force F directed between the rolls 1 and 2 (on the upper side) is generated at the roll 7 to generate compressive stress in the rolling part A of the rolls 1 and 2. This allows the density of the powder plate 7 to be further increased.

As described above, the powder plate 7 which is molded with increased density has improved transport strength and is less prone to cracking, making it possible to produce healthy strips and the like.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can also be applied to cases in which the rolling rolls are rotated at different speeds, and that the pinch roll method is replaced with a pinch roll method as a means for providing resistance on the exit side of the powder plate, and sliding friction is used instead of the pinch roll method. It goes without saying that a resistance adding system may be employed, that various systems may be employed for the pressurized supply device, and that various changes may be made without departing from the gist of the pond water invention.

[Effects of the Invention] As described above, according to the powder rolling method and apparatus of the present invention, pressure is applied to the powder supplied between the twin rolling rolls, and resistance is applied to the exit side of the powder plate to be rolled and formed. By applying this, it is possible to perform rolling forming while applying a large compressive force to the rolling part of the powder by the rolling rolls,
Therefore, the powder density of the powder plate can be greatly increased, and the increased strength can have an excellent effect of preventing the occurrence of cracks and the like.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing an example of a conventional system. 1.2 is a rolling roll, 3 is a powder, 4 is a pressure container, 5 is a pressure head, 6 is a pressure supply device, 7 is a powder plate, and 8.9 is a pinch roll.

Claims (1)

[Scope of Claims] 1) A method of rolling forming a plate directly from powder using twin roll type rolling rolls, in which the powder is supplied to the rolling forming section of the rolling rolls while applying pressure to the powder, and at the same time A powder rolling method characterized in that a compressive stress directed toward the rolling part is applied by applying resistance to the powder plate formed by the rolling rolls. 2) In addition to providing a pressure supply device that supplies powder while applying pressure between twin roll type rolling rolls,
The invention is characterized in that a pinch roll is disposed at a position on the exit side of the powder plate rolled and formed by the rolling rolls to pinch the powder plate and whose rotational speed can be arbitrarily changed in accordance with the rotation of the rolling rolls. Powder rolling equipment.