JP2668942B2 - Continuous powder rolling method and apparatus - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method and an apparatus for rolling a powder material for rolling a powder material into a plate shape.

[Prior Art] A conventional powder rolling apparatus will be described with reference to FIG.
A hopper 4 containing a powder material 3 therein is installed above a powder rolling machine 2 having a pair of rolls 1 horizontally positioned at a predetermined interval, and the powder material 3 is moved from the hopper 4 in opposite directions. The powder material 3 is rolled by supplying the material between the rolls 1 rotating as indicated by the arrows to form a green sheet 5.

The rolled green sheet 5 is guided by a plurality of appropriately arranged guide rolls 6 to move through a vertical portion 7, a curved portion 8 and a horizontal portion 9, and is pre-sintered by a sintering furnace (not shown). , And is re-rolled by a rolling mill (not shown) to form a plate.

[Problems to be Solved by the Invention] However, according to the above-mentioned conventional device, the powder material 3
When the powder is rolled into the green sheet 5 by the powder rolling machine 2, the rolling area is narrow as shown in FIG. 4 because it is rolled by the surface of the circular roll 1. Therefore, the rolling force is transmitted to the inside of the green sheet 5. hard. If the rolling force is not transmitted to the inside, even if the surface of the green sheet 5 is diffusion-bonded and becomes metallic, only the powder is gathered inside the green sheet 5 and the diffusion-bonding is not performed. Green sheet 5 in this state
However, even if the powder enters the sintering furnace in the subsequent step and is sintered, the powder does not form a metallic bond, and therefore the plate formed by rerolling cannot obtain sufficient strength.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a powder rolling forming method and apparatus capable of sufficiently performing diffusion bonding even inside a green sheet.

[Means for Solving the Problems] In the continuous powder rolling and molding method according to the first aspect of the present invention, the powder material stored in the hopper is fed to a rolling machine provided below the hopper and rolled to obtain a green sheet. And the direction of travel of the green sheet is changed from a vertical direction to a horizontal direction on the delivery side of the rolling mill by a guide roll, and the green sheet travels in synchronization with the speed of the green sheet rolled by the rolling mill. The step of compressing both surfaces of the green sheet by press so that diffusion bonding is performed to the inside of the green sheet is continuously performed.

Further, the continuous powder rolling and molding apparatus of the second invention supplies the powder material between a hopper that stores the powder material and a pair of horizontal rolls horizontally installed in the lower part of the hopper, and rolls the powder material to form a green sheet. A rolling mill and a press for traveling in synchronism with the speed of the green sheet fed from the rolling machine and compressing both sides of the green sheet to perform diffusion bonding to the inside, a material moving direction from upstream side to downstream side The green sheets are sequentially arranged so that they can be continuously molded and compressed.

[Operation] Since the green sheet is continuously molded to the compression step and sufficiently diffuse-bonded to the inside of the green sheet, the bonding in the thickness direction of the green sheet, which is the compression direction, becomes fine, and the short-time It is possible to obtain a high-strength, high-quality sintered plate material.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the present invention, in which the green sheet 5 is used.
In the horizontal portion 9 on which is conveyed, a carriage 15 that can travel on a rail 14 laid in the line direction by a fluid pressure cylinder 13, a lower die 10 fixedly arranged on the carriage 15, and A press 12 having an upper mold 11 which is arranged above the lower mold 10 so as to face each other and which can cooperate with the lower mold 10 to compress the green sheet 5 is provided. On the downstream side in the line direction, a finishing mill 16 for finishing the green sheet 5 smoothly is installed.

The green sheet 5 formed by rolling the powder material 3 at a low speed of about 10 m / min per roll speed by the powder rolling machine 2 moves through the vertical portion 7, the curved portion 8 and the horizontal portion 9, and In the part 9, while being supported by the fluid pressure cylinder 14 on the lower die 10 of the press 12 that runs at the same speed and in the same direction as the green sheet 5, the upper die 11 of the press 12 descends to compress the upper and lower surfaces. Is done. After the press 12 has moved a predetermined distance in this state, the upper die 11 is raised, the press 12 is returned to its original position by the fluid pressure cylinder 14, and the press 12 travels at the same speed as the green sheet 5 again in the same manner as above. The upper and lower surfaces of the green sheet 5 are compressed by the upper and lower molds 11 and 10, and this is continuously repeated.

The green sheet 5 compressed by the press 12 is moved to a finishing mill 16 and smoothed on the upper and lower surfaces, and then pre-sintered in a sintering furnace (not shown). ) And re-rolled to form a finished product.

The green sheet 5 is pressed in the horizontal portion 9.
As shown in FIG. 2, the upper and lower metal molds 11 and 12 compress the material in a wide compression area (b), so that the stress range extends to the inside thereof and the powder is sufficiently diffusion-bonded. A plate with sufficient strength can be obtained by pre-sintering and re-rolling.

It should be noted that the embodiment of the present invention is not limited to the above-described example of the embodiment, and it goes without saying that various changes can be made without departing from the spirit of the present invention.

[Effects of the Invention] According to the present invention, since the green sheet molding to the compression step are continuously performed and the diffusion bonding is sufficiently performed inside the green sheet, the compression direction in the thickness direction of the green sheet is It is possible to obtain an excellent effect that the bonding becomes dense and a high-strength and high-quality sintered plate material can be obtained in a short time.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an embodiment of the present invention, FIG. 2 is an explanatory view of a compressed state of a green sheet compressed using a press according to the present invention, FIG. 3 is an explanatory view of a conventional device, and FIG. It is explanatory drawing of the compression state of the green sheet in a powder rolling mill. In the figure, 1 indicates a roll, 2 indicates a powder rolling mill, 3 indicates a powder material, 5 indicates a green sheet, and 12 indicates a press.

Claims (2)

(57) [Claims] 1. A step of feeding a powder material stored in a hopper to a rolling mill provided at a lower portion of the hopper to roll the powder material to form a green sheet, and a moving direction of the green sheet by a guide roll. At the delivery side of the rolling mill, the direction is changed from the vertical direction to the horizontal direction, and both sides of the green sheet are diffusion-bonded to the inside of the green sheet by a press running in synchronization with the speed of the green sheet rolled by the rolling mill. A continuous powder rolling and molding method, characterized in that the step of compressing so as to be exposed is continuously performed. 2. A hopper for storing the powder material, a rolling mill for feeding and rolling the powder material between a pair of horizontal rolls horizontally installed below the hopper to form a green sheet, and a delivery from the rolling mill. A green press that runs in synchronization with the speed of the green sheet and compresses both sides of the green sheet to perform diffusion bonding to the inside is sequentially arranged from the upstream side to the downstream side in the moving direction of the material. A continuous powder rolling and molding apparatus characterized in that it is configured so that the sheet can be continuously molded and compressed.