JPS6376807A - Powder rolling method for thick plate - Google Patents

Abstract

PURPOSE:To produce a green strip having a desired thickness at a low cost by passing strips between a pair of horizontally disposed rolling rolls, supplying metal powder between the strips and rolling both, thereby integrating the strips and the powder. CONSTITUTION:Two units of powder rolling mills 6, 7, 8 provided with hoppers 3 for supplying the powders 4 of the metals, etc., perpendicularly above a pair of the horizontally disposed rolling rolls 1, 2 are juxtaposed on the upper stream and one unit thereof is disposed on the down stream. The green strips 9, 10 formed by the respective powder rolling mills 6, 7 on the upper stream are introduced into the powder rolling mill 8 on the down stream where the powder 4 is supplied between the strips 9 and 10 to roll and integrate the strips and the powder and to form the green strip 11. The above-mentioned stage is repeated until the desired thickness is attained; thereafter, the strip is calcined and is further subjected to hot rolling and cold rolling, by which the sheet is finished to the strength nearly on a par with the strength of a material produced by melting. The green strip having the desired thickness is thereby obtd. without increasing the diameter of the rolling rolls.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a thick plate powder rolling method.

[Prior Art] A conventional powder rolling method will be explained with reference to FIG. 3. A hopper is placed vertically above a pair of horizontally arranged rolling rolls 1.2 and supplies powder 4 of metal or the like between the rolling rolls 1.2. 3 is provided, a powder 4 of metal or the like is supplied into the hopper 3, and the rolling rolls 1.2 are simultaneously rotated with their opposing surfaces facing vertically downward.
The powder 4 near the rolling rolls 1 and 2 is drawn in by the rolling roll 1.2 and rolled between the rolling rolls 1.2 to obtain a green strip 5.

[Problems to be Solved by the Invention] However, in the conventional powder rolling method described above, the green strips obtained are limited to those with a thin plate thickness, and the roll gap is simply increased to obtain a thick plate. Also, if the particle size of the powder is small, the powder will be compressed and
, can't get a plank. Therefore, in order to form a thick plate, it has been necessary to increase the radius d of the rolling rolls or to increase the size of the hopper to increase the contact angle α of the powder with the rolling rolls, thereby increasing the drawing force of the powder. However, increasing the diameter of the rolling rolls increases manufacturing costs and requires strengthening the drive system to accommodate the increased weight, which is not practical.

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, an object of the present invention is to provide a method for powder rolling a thick plate by rolling powder together with a strip such as a green strip to obtain a thick plate.

[Means for solving the rolling point problem] The present invention involves inserting a strip between a pair of horizontally arranged rolling rolls, supplying a metal powder between the pair of rolling rolls, and rolling the metal powder together with the strip. This is a thick plate powder rolling method.

[Function] Accordingly, in the present invention, the strip is rolled with powder in a powder rolling machine to increase its thickness, and by successively repeating the rolling process, a green strip of a desired thickness can be obtained.

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

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

A hopper 3 that supplies powder 4 such as metal between the rolling rolls 1 and 2 vertically above a pair of rolling rolls 1 and 2 arranged horizontally.
Three powder rolling mills 6, 7°8 equipped with To rolling mill 8,
The powder 4 in the hopper 3 is simultaneously inserted between the rolling rolls 1.degree. from both sides.

Because of this configuration, the two upstream powder rolling mills 6
．． The green strips 9 and 10 produced in step 7 become the outer shell in the downstream powder rolling mill 8, and the green strips 9 and 1
0, the powder 4 is rolled to produce a green strip 11 with a large thickness.

Green strip 11 is a green strip manufactured in the upstream powder rolling mill 6.7, which has a small true density ratio (relative density with the atomic density of ingot material being 100) and has many pores and has good bonding properties due to compression. 9. IO and powder 4 are well combined and integrated.

Once the desired thickness is achieved by repeating the above steps, the green strip is sintered and further hot-rolled or cold-rolled to give it a strength comparable to that of molten material.

FIG. 2 shows another embodiment of the invention. The three powder rolling mills 12, 13, and 14 are arranged in series, and the green strip 15 produced by the first stage powder rolling mill 12 is guided to the hopper 3 middle of the second stage powder rolling mill 13. It is inserted between the rolling rolls 1 and 2 together with the powder 4, and the second stage powder rolling mill 1
The green strip te produced in step 3 is similarly inserted into the third stage powder rolling mill 14, and the green strip 17
Manufacture.

Because of this configuration, the green strip 15.16 inserted into the powder rolling mill 13.14 becomes an inner shell between the rolling roll l and the green strip 15.16, and between the rolling roll 2 and the green strip 15.18. Powder rolling is performed at three locations to produce thick green strips all at once. That is, compared to the first-stage green strip 15, the second-stage green strip is approximately three times as thick, and the third-stage green strip is approximately five times as thick.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be applied to green strips and ingots having a high true density ratio by increasing the bondability with the powder, such as by increasing the temperature or using highly ductile materials. The green strip can be used, the number of stages in the powder rolling mill can be increased, or instead of increasing the number of stages, the produced green strip can be rolled up into a coil once and then inserted into the powder rolling mill by repeating batches. After sintering the green strip, it can be inserted into a powder rolling machine together with the powder, and by using different types of powder to be fed to the powder rolling machine at each stage, multi-layer thick plates with different compositions can be produced. It goes without saying that it can be manufactured and that various changes can be made without departing from the gist of the invention.

[Effect of the invention] As described above, according to the thick plate powder rolling method of the present invention,
By arranging powder rolling mills in multiple stages, it is possible to obtain green strips of the desired thickness, and compared to the case where thick plates are obtained by increasing the diameter of the rolling rolls, the manufacturing cost of the rolling rolls and the means for driving the rolling rolls are reduced. It is possible to achieve various excellent effects, such as reducing the amount of damage caused by the green strip and making it possible to obtain a green strip with a larger thickness.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of one embodiment of the present invention, FIG. 2 is an explanatory diagram of another embodiment of the present invention, and FIG. 3 is an explanatory diagram of a conventional example. In the figure, 1 and 2 are rolling rolls, 3 is a hopper, 4 is powder, and E
i, 7.8 is a powder rolling mill, 9. to, 11 indicates a green strip.

Claims (1)

[Claims] 1) A thick plate powder rolling method characterized by passing a strip between a pair of horizontally arranged rolling rolls, supplying metal powder between the pair of rolling rolls, and rolling the metal powder together with the strip.