JPS59128000A - Powder molding machine - Google Patents

Abstract

PURPOSE:To eliminate the uneven thickness of a molding and to make the thickness uniform by leveling off the powder while rising or rotating a bottom die in the stage of packing the powder in a cylindrical die. CONSTITUTION:The metallic oxide powder 4 charged into a cylindrical die 5 is leveled off by a leveling plate 13 when a bottom die 7 is in a slightly ascending state or while the bottom die is rotated by a gear for rotating the bottom die. The powder on the front side in the advancing direction of an arrow A is packed with high bulk and the rear side is packed with low bulk in the case of the former. The density of the powder is lower on the front side of the die 5 and higher on the rear side and is offset by each other, whereby the uniform powder having no deviation in the thickness is obtd. The powder 4 is leveled off while it is rotated in the case of the latter in which the bottom die is rotated and therefore the powder is leveled off in the state of a uniform density and thickness. The tablet 17 pressed between upper and lower pressing rolls 16 and 15 is uniformly molded without deviation in the thickness.

Description

[Detailed description of the invention] Industrial applications The present invention relates to silver batteries and nickel-cadmium batteries.

Metal oxide powder is a positive electrode active material for small flat batteries such as mercury batteries, ponds, and button-type alkaline batteries.

This relates to a powder molding machine that molds into a disk shape.

Conventional structure and its problems Conventionally, rotary molding machines mold metal oxide powder, which is the positive electrode active material of small flat batteries.

After the lower die moves down inside the die and fills it with powder.

The lower die was raised to scrape out unnecessary powder, and then a so-called slitting process was performed in which the powder protruding from the upper surface of the die was removed using a slitting plate while the lower die remained in a fixed position. During this slitting, the density of the powder in the die increases at the front and rear sides in the direction of movement of the die. In other words, the density on the back side where the powder is pressed by the slitting plate is higher than on the front side.

It is molded using the pressure process of this folding rotary molding machine.

The taken out disc-shaped tablet is thinner at the front in the direction of die movement and thicker at the back, with uneven thickness, and when used as a positive electrode tablet for a small flat battery, it can get caught in the flow of a chute during the process. There are other problems. Alternatively, as a battery, a separator is placed on the tablet inside the case, and a sealing plate containing the negative electrode is placed inside.

When sealing the tablet, the uneven thickness of the tablet caused the sealing plate to tilt, making it less resistant to leakage.

Purpose of the Invention The present invention provides a molding machine for molding metal oxide powder by solving one or more of the conventional drawbacks of pressure, and aims to obtain tablets with no uneven thickness. .

Structure of the Invention In order to achieve the above object, the present invention provides a powder molding machine that molds metal oxide powder using a cylindrical die and an upper die and a lower die that are slidable up and down within the cylindrical die. This device is characterized by being equipped with a slitting cam and a slitting plate that raise the lower mold when slitting is performed to fill powder inside.

According to the molding machine of the present invention, there is no unevenness or non-uniformity in the filling and slitting of the powder into the die, and it is possible to mold a disc-shaped tablet with a uniform thickness.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a main part of a powder slitting section in a powder filling process of a rotary molding machine. In the figure.

Reference numeral 6 denotes a rotary disk, which is divided into an upper portion, a central portion, and a lower portion, and is rotated in the direction of arrow A by separate power around the shaft 3 as a single unit. This rotary disk 6 has upper molds 2. A cylindrical die 6 is placed in the center, and a lower die 7 is placed in the lower part.

Upper mold 2. The lower mold 7 is guided through a hole 10 at the upper part of the rotary disk and a hole 11 at the lower part, respectively, and can both be slid up and down and freely rotated. Further, the cylindrical die 5 placed in the center is fixed to a rotary disk 6, and an upper die 2 is placed inside it.
．． There is a hole for the lower mold 7 to enter.

1 is fixed to the shaft 3 with an upper cam, and the rotary disk 6 is indicated by the arrow A.
The shape is such that the upper mold 2 lowers and rises as it rotates in the direction. Reference numeral 8 denotes a slotted cam which can be slid up and down within the holder 12 and can be fixed at any vertical position using a separate screw. Reference numeral 14 denotes a gear for rotating the lower mold, which is fixed on the base 9 at a position such that the lower mold 7 rotates within the die 5 when slitting the powder 4 made of metal oxide. 13 is a 6-page slitting board, and the powder 4 is slit with this board.

Figure 2 shows a 10-type 29 cylindrical die 5. This is a drawing developed on the circumference of the rotary disk 6 along the center line of the lower die 7.

Behind the slitting cam 8, a lower pressure roll 15- and an upper pressure roll 16 are disposed at positions opposite to each other above the lower pressure roll. Powder 4, which has been sucked to the right size, is on top.

Upper mold 2. moved by lower pressure roll 15.16.
It is pressurized by the lower mold 7 and becomes a disc-shaped tablet 17.

In the molding machine configured as described above, the powder 4 sucked into one cylindrical die 5 is transferred by the necessary weight to the upward slope of the slitting cam 8 fixed at an arbitrary position corresponding to the lower die. Since the lower die 7 is slit by the slit cutting plate 13 while rising slightly, the front side in the direction of movement indicated by the arrow is bulky.

On the other hand, the rear side in the direction of travel is filled with a lower volume than the front side. In addition, the density of the powder 4 itself is low at the front side of the cylindrical die and high at the rear side when slitting the slitting plate 13, so that the density of the powder 4 itself is low at the front side of the cylindrical die and high at the rear side. When it became a disc-shaped tablet 17,
A homogeneous product with no uneven thickness can be obtained.

FIG. 3 shows a state in which the lower mold 7 is rotated within the die 6 during powder slitting by the lower mold rotation gear 14. In this case as well, the powder 4 made of metal oxide is weighed only by the required weight.
Slipping cam 8 fixed at any position corresponding to the lower die
While the lower die 7 is being rotated by the lower die rotation gear 14 on the horizontal orbit.

Slotting is performed by a slitting plate 13. On this occasion.

Since the powder 4 in the die 5 is slit while being rotated by the lower die 7, the powder 4 is slit while being rotated by the lower die 7, so that the powder is slit with uniform density regardless of the direction of movement of the one-turn plate 6 indicated by the figure. Therefore, the disc-shaped tablet 17 pressed between the upper and lower pressure rolls 16 and 16 has no unevenness in thickness and is uniform.

Effects of the Invention As described above, according to the powder molding machine of the present invention, when filling powder and slitting, the lower mold moves upward while slitting, so the lower density part on the front side in the direction of movement of the die is bulky, and the lower part on the rear side is bulky. The high-density part is filled with a low volume and is molded in a pressurizing process, and the disc-shaped tablet taken out is homogeneous with no unevenness in thickness.

Further, even when slitting the powder while rotating the lower die within the die, there is an advantage that the density of the powder can be made uniform over the entire die regardless of the direction of movement of the die, and uneven thickness does not occur.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the main part of the powder slitting part in the powder filling process of a rotary molding machine according to an embodiment of the present invention, Fig. 2 is a developed view explaining the powder filling slitting process, and Fig. 3 is the lower mold. FIG. 7 is a developed view showing another example in which the lower die is rotated within the die by a rotating gear during powder slitting. 1...Top cam, 2...Top mold, 3...
... shaft, 4 ... powder, 6 ... cylindrical die, 6 ... rotary disk, 7 ... lower mold -
8...Slotting cam-12...Holder-13...Slotting plate-14...Lower mold rotation gear. 16...Lower 7JD pressure roll, 16...
・Top pressure roll, 17...Disc-shaped tablet. Figure 1

Claims (2)

[Claims] (1) A molding machine that molds metal oxide powder using a cylindrical die, and an upper mold and a lower mold that can slide up and down inside the die, and when filling the powder into the die and cutting the slit, the molding machine A powder molding machine equipped with a slitting cam that raises the mold and a slitting plate. (2) The powder molding machine according to claim 1, further comprising a lower die rotation gear for rotating the lower die within the die during powder filling and slitting into the die.