JPS60101480A - Hot press device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot press apparatus for continuously sintering and molding ceramics and the like.

An example of a conventionally used press machine is explained with reference to FIG. The lower push rod d is inserted into the molded hole from below. The outer periphery of mold a is coated with platinum.
A heating device e such as a rubidium heating wire is attached to heat the mold a.

When sintering hot press ferrite or the like using this hot press device, the upper push rod C1 and the lower push rod d are respectively raised from the positions shown in FIG. 1, the upper push rod C is pulled out above the molding hole, and the lower push rod d is in a state where it is fitted into the F part of the molded hole.

Mold a is heated to 700 to 1,400 by heating device e.
℃, and feed the powder f to be sintered, such as ferrite powder, into the molding hole, and when the upper push rod C is inserted into the molding hole and pressurized, the powder [and the wall surface of the molding hole] Frictional resistance is generated between them, and the lower push rod d gradually descends together with the powder r. This descending speed can be adjusted from 2 to 60 cm per hour.

The powder F will be hot-pressed while passing through the high-temperature zone, but when the upper push rod C is inserted into the molding hole by a certain distance, such as about 15 mm, it will move upward and enter the molding hole, so that it will not be removed. It becomes like this. After the powder r is again supplied into the molding hole, the upper push rod C is lowered and the same operation is repeated. In this way, the product q is taken out from below the sea urchin molding hole J shown in FIG.

As mentioned above, in conventional hot press equipment, the upper Jll
Since the l rod C could not be continuously suppressed, it was impossible to make the powder hot press completely continuous.

The purpose of the present invention is to improve this point and make it possible to obtain a continuous press from hole 1 to press, by making a small hole in the center of the press ram that is fitted from above the molding hole, and forming an enlarged portion communicating with the small hole and expanding downward at the repose angle of the powder to be sintered;
A feeding device is provided below the molding hole.1. This relates to a hot press device in which powder to be sintered is supplied through small holes.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 2, 1 is a sintering furnace, the inner surface of which is covered with a heat insulating wall 2. There is a mold 3 inside the sintering furnace 1, and a heating device 4 such as a heater or an induction heating coil is provided around the outer periphery of the mold 3 to heat the mold 3.

A molding hole 5 is vertically provided in the mold 3, and a press ram 6 is fitted into the molding hole 5 from above. The press ram 6 has a small hole 7 bored in the center (axis center).
Further, an expanded portion 8 is formed on the lower surface of the press ram 6. The expanded portion 8 expands downward at an angle equal to the angle of repose of the powder 9 to be sintered, which will be described later, and the upper end of the expanded portion 8 communicates with the lower end of the small hole 7.

Outside the sintering furnace 1 and below the forming hole 5, a feed device @10 such as a feed roll is provided, and further below that, a cutting device 11 is provided.

The feeding device 10 does not actively send the product 12 downward in Figure 2, as will be described later, but is given a force to push the product 12 upward in Figure 2, so that the product 12 is forcibly moved as described later. It rotates passively by being pushed down.

When hot pressing is performed using the apparatus shown in FIG. 2, a receiving rod (not shown) is fitted from below the molding hole 5 to close the lower end of the molding hole 5. Then, the mold is heated to the sintering temperature by a heating gi 4, and the powder 9 to be sintered is continuously supplied to the small hole 7 by a supply pump (not shown), and the press ram 6 is operated at a constant pressure by a hydraulic sill device (not shown). Press down with .

The powder continuously supplied to the small hole 7 by the supply pump is
It passes through the small hole 1 and fills the molding hole 5. Soshi mold 3
It is sintered while receiving heat from GJ1 and being pressurized. When the powder 9 begins to sinter, the receiving rod (not shown) blocking the lower end of the molding hole 5 is removed.

The supply pressure of the supply pump that continuously supplies the powder 9 to the small hole 7 is kept at a high pressure so that the powder 9 can be fed against the internal pressure caused by the powder 9 filling the molding hole 5.

The powder 9 is heated and pressurized in the molding hole 5 and sintered to form a product 12.
Then, due to the pressure from above, it comes out below the molding hole 5 and reaches the feeding device 10.

The pressing force pushing the press ram 6 downward with a constant force is mainly opposed by the frictional force between the mold 3 and the powder 9 being sintered, and the feeding device 10 tries to push the product 12 back. The force also opposes the pressing force of the press ram 6, and the press ram 6
acts to keep it in a certain position. The counterforce exerted by the feed device 10 can be adjusted.

The powder 9 that is continuously supplied to the small hole 7 is filled into the molding hole 5 without creating a gap due to the expanded portion 8 whose width corresponds to the angle of repose, and is heated under pressure to form a continuous product 12. The material is then pushed downward by the feeding device 10, and is periodically cut into a constant length by the cutting device 11.

As explained above, the present invention has the advantage that hot pressing can be performed continuously while supplying powder from the small holes without the press ram rising midway.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a conventional device, and FIG. 2 is a longitudinal sectional view of an embodiment of the present invention. 3 is the mold, 4 is the heating device, 5 is the molding hole, 6 is the press ram, 7 is the small hole, 8 is the expanded part, 9 is the powder, and 10 is the feeding device. Kogyo Co., Ltd. Patent Applicant Agent Figure 1 Figure 2 ± 2 1

Claims (1)

[Claims] 1) A mold having a vertical molding hole, a heating device that heats the mold, a press ram that is fitted into the molding hole of the mold from above and pressurized downward, and a press ram that is bored in the axial center of the press ram. a small hole for supplying the powder to be sintered;
an enlarged portion formed on the lower surface of the press ram and communicating with the lower end of the small hole and expanding downward at the repose angle of the sintered powder; and a feeding device installed below the molding hole. A hot press device characterized by being equipped with.