JP2517928B2 - Hot press machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hot press device for uniaxially pressing and sintering a material to be pressed such as ceramics, and more particularly to a single pressed product continuously. The present invention relates to a hot press device that can be molded into.

[Prior Art] In hot pressing of ceramics and the like, generally, a mold filled with raw material powder to be pressed is placed in a closed container,
A compact sintered product is obtained by pressing in a uniaxial direction in a vacuum or an electrically heated atmosphere of an inert gas.

[Problems to be Solved by the Invention] However, most of the conventional hot press apparatuses are single-chamber type batch furnaces, in which the mold is taken out through charging, gas replacement, hot pressing, and cooling. Since only one treatment can be performed in one cycle, the productivity and thermal efficiency are not good.

On the other hand, in recent years, multi-chamber type semi-continuous furnaces have become widespread, but significant improvement in productivity cannot be expected, and the equipment cost tends to be higher than the production amount. There is a problem that it is hard to say that the total merits are given.

The present invention has been made in consideration of the above circumstances, and provides a hot press device capable of completely continuous processing from the supply of raw material powder to be pressed to the removal of a pressed product in a mold forming one chamber. The purpose is to

[Means and Actions for Solving Problems] In order to achieve the above-mentioned object, the present invention forms one of a raw material powder inlet for pressing and the other forms a hot press product outlet, and A cylindrical mold having a heating means for heating the press raw material powder, a press raw material charging means for charging a predetermined amount of the press raw material powder into the mold from the charging opening, and a mold from the charging opening side. It is provided so as to reciprocate with a predetermined stroke inside, and the raw material powder to be pressed, which is charged in a predetermined amount from the charging port side, is sequentially pressed to the press pedestal on the outlet side and the hot pressed products are laminated. The press ram means for sequentially moving to the press cradle on the outlet side in the state, and the contact surface and the mold of the hot-pressed product that has been previously charged and pressed before the raw material is charged from the above-mentioned raw material powder charging means. A mold releasing agent supplying means for supplying a mold releasing agent into the inside, and a product take-out device for taking out the hot press product discharged to the press cradle from the take-out port are provided. A predetermined amount of raw material powder to be pressed is pressed and pressed by a press ram means, and hot press products can be manufactured continuously by repeating this in sequence. Moreover, a release agent is hot-pressed product before the raw material powder is added. The hot pressed products do not adhere to each other by supplying them to the contact surface of the mold and the mold, and the pressed products in the mold can be smoothly moved to the outlet.

[Embodiment] A preferred embodiment of the hot pressing apparatus of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a closed container, the inside of which is made a vacuum or an inert gas atmosphere. A mold 2 made of a cylindrical body is provided in the container 1, and a heating means 4 made of a heating coil is provided on the outer periphery of the formwork 2 via a heating chamber heat insulating material 3.

A raw material powder inlet 5 is formed in the upper part of the mold 2, and a hot press product outlet 6 is formed in the lower part.

A press ram means 8 for pressing the fed raw material powder 7 is provided on the raw material powder feeding port 5 side of the mold 2.

The press ram means 8 is provided with the raw material powder charging port 5 of the mold 2.
It consists of a press ram 9 fitted inside and a pressing cylinder 10 for reciprocating the press ram 9 by a predetermined stroke. The pressing cylinder 10 is attached to the outer top of the closed container 1, and the press ram 9 reciprocates up and down in the closed container 1. It is designed to move.

A press pedestal 11 is provided at the bottom of the closed container 1, and the press ram means 8 above the press pedestal 11 presses the raw material powder 7 to be pressed in the formwork 2.

A raw material powder pressing means 12 for supplying a predetermined amount of raw material powder 7 to be pressed into the mold 2 into the inlet 5 of the mold 2.
And a release agent supply means 14 for supplying the release agent 13.

The raw material powder feeding means 12 for pressing the raw material powder is provided above the feeding port 5 of the mold 2 and so as to surround the press ram 9, and the raw material powder 7 to be pressed provided outside the closed container 1. A storage tank 16 to be stored and an upper sluice valve 17 in the storage tank 16.
The gas replacement chamber 18 is connected to the gas replacement chamber 18 via a lower sluice valve 19, the supply pipe 20 is passed through the closed container 1 and faces the raw material supply tank 15.

Further, in the release agent supply means 14, a release agent supply tank 22 is formed by a notch step portion 21 formed in the upper inner circumference of the charging port 5 of the mold 2 and the outer circumference of the raw material supply tank 15, and the release agent is formed. In order to supply the release agent 13 from the release agent storage tank 23 outside the closed container 1 to the supply tank 22,
An upper sluice valve 24, a gas replacement chamber 25, and a lower sluice valve 26 are connected to the storage tank 23, and a supply pipe 27 facing the release agent supply tank 22 is connected to the underlying sluice valve 26.

At the bottom of the closed container 1, a take-out device 29 such as a hydraulic cylinder for taking out the hot-pressed product 28 discharged onto the press pedestal 11 is provided.
A take-out device 29 for ejecting the hot-pressed product 28 removed from the outside of the closed container 1 is provided.

This take-out device 29 comprises a product take-out hole 31 provided at the bottom of the closed container 1, and upper and lower gate valves 32, 33 are provided in the product take-out hole 31.
And a gas replacement chamber 34 is formed between the gate valves 32 and 33.

In the above, the mold 2 is formed in a size such that a plurality of hot-pressed products 28 can be sequentially laminated and molded, and the heating means 4 causes the hot-pressed products 28 in the mold 2 to be induction-heated in a predetermined heat pattern. It is divided into multiple zones like this, and temperature control can be performed in each zone. The heating means 4 determines the number of hot press products 28 in the heating zone in the heating zone and also determines the length of the heating zone based on the relationship between the heating time of the hot press product 28 and the production cycle time (takeout period). .

Further, a cooling zone 35 is provided between the take-out port 6 of the formwork 2 and the press pedestal 11.
Is formed, and the hot press product 28 is exposed from the mold 2 for cooling, and at the same time, cooling the outside of the closed container 1 with water is accelerated. The length of the cooling zone 35 and the number of rooms in the room are determined by the relationship between the cooling time of the hot press product 28 and the take-out cycle.

To perform hot pressing, since the mold 2 is empty at the start of hot pressing, a dummy material (for example, graphite) is charged from the press pedestal 11 to the upper part of the mold 2,
A predetermined amount of raw material powder 7 to be pressed is supplied from the raw material powder 12 to be pressed onto the dummy material, and at the same time, a release agent supplying means.
After the release agent 13 is supplied from 14 to the inner surface of the mold 2 above the dummy material, the raw material powder 7 to be pressed is pressed by the press ram means 8 and then one dummy material on the press pedestal 11 is taken out by the unloading device 30. After the removal, the raw material powder 7 to be pressed is charged into the mold 2 as described above, the mold release agent 13 is supplied, and the press ram means 8 presses and repeats this sequence in sequence to perform substantially continuous hot pressing. .

The raw material powder 7 to be pressed and the release agent 13 are supplied from the respective storage tanks 16 and 23 outside the closed container 1, but the upper and lower sluice valves 17, 24 and 1 are provided.
By alternately opening and closing 9,26 to make the pressure in the gas replacement chambers 18,25 the atmospheric pressure and the pressure in the closed container 1, it is possible to supply without trouble, and the hot press product 28 can also be taken out by the read-out device 30 at the extraction hole 31. After the transfer, the upper and lower sluice valves 32 and 33 are alternately opened and closed to adjust the pressure of the gas replacement chamber 34, so that the gas can be taken out without trouble.

Next, the details of this hot press will be described with reference to FIGS.

FIG. 2 is a hot-pressed product to be heat-treated after the raw material powder 7 to be pressed is charged and the pressing by the press ram is completed.
28a shows a state in which 28a is positioned at the top of the mold 2.

As shown in FIG. 2, the pressing portion 9a of the press ram 9 is set to a position A that covers the lower portion of the raw material supply tank 15, and in this state, the release agent is placed in the lower gap 36 of the release agent supply tank 22. Supply 13. Next, as shown in FIG. 3, the pressing portion 9a of the press ram 9 is
Is raised to a position B of the hopper portion 15a which is spread above the raw material supply tank 15, a predetermined amount of raw material powder 7 to be pressed is put into the raw material supply tank 15, and it is pressed by the pressing portion 9a of the press ram 9.
Then, they are pressed as shown in FIG. According to this pressing, the release agent 13 in the release agent supply tank 22 is sequentially supplied through the gap 36 between the raw material powder 7 to be pressed and the inner surface of the mold 2.

The pressing portion 9a of the press ram 9 is moved to a position C where the upper portion of the mold 2 is closed as shown in FIG.
After compressing for a certain period of time, the hot press product 28 on the press pedestal 11 is removed, and as shown in FIG. 6, the pressing portion 9a is moved to the position D having a length corresponding to the height of the hot press product 28. By pushing down, each hot press product 28 in the mold 2 is moved downward.

After that, the pressing portion 9a is pulled up to the position A shown in FIG. 2 and the above operation is repeated.

The hot-pressed product 28 in the mold 2 is press-molded and then heat-treated through the heating means 4 to be exposed to the atmosphere in the closed container 1 through the take-out port 6 of the mold 2, and the press cradle 11 thereof.
It is cooled in the cooling zone 35, reaches the upper surface of the press receiving table 11, is taken out by the take-out device 30, is transferred to the take-out hole 31, is discharged to the outside of the closed container 1, and is collected.

[Effects of the Invention] As is clear from the above, according to the present invention, the following excellent effects are exhibited.

(1) A predetermined amount of raw material powder to be pressed is placed in a mold, compressed, and successively repeated to perform continuous hot pressing, which improves productivity and enables mass production.

(2) Since the mold is fixed and the mold does not need to be taken in or out of the furnace, there is no sensible heat loss due to heating and cooling of the mold as well as labor saving in handling, and the heat exchange rate is greatly improved. To do.

(3) Since the raw material powder to be pressed is put into the mold and the release agent is put so that the hot-pressed products do not bond with each other, the hot-pressed products can be taken out separately and the cutting step is not necessary. Smooth movement within the formwork.

(4) Since the formwork is a compact one-chamber structure, the equipment cost is lower than that of the multi-chamber type, and it contributes to the reduction of the product cost by reducing the utility consumption and improving the productivity.

[Brief description of drawings]

FIG. 1 is an overall sectional view showing an embodiment of the hot pressing apparatus of the present invention, and FIGS. 2, 3, 4, 5 and 6 are shown in FIG. 1 when hot pressing is performed. FIG. 3 is a main-portion cross-sectional view illustrating one cycle of the process. In the figure, 2 is a form, 4 is a heating means, 5 is a raw material powder input port to be pressed, 6 is a hot press product outlet, 7 is a raw material powder to be pressed, 8 is a press ram means, 11 is a press stand, and 12 is Reference numeral 13 is a release agent, 14 is a release agent supplying means, and 28 is a hot press product.

Claims (1)

(57) [Claims] 1. A cylindrical formwork having one heating port for forming raw material powder to be pressed and the other outlet forming a hot-pressed product, and heating means for heating the raw material powder to be pressed; A raw material pressing means for feeding a predetermined amount of raw material powder to be pressed into the form from the mouth, and a predetermined amount provided from the input side into the form with a predetermined stroke in the form. Press ram means for sequentially pressing the raw material powder to be pressed for each of the hot pressed products and sequentially moving the hot-pressed products in a stacked state to the outlet, and prior to the raw material input from the raw material powder input means for pressing , A releasing agent supply means for supplying the releasing agent into the contact surface and the mold of the hot-pressed product which has been previously put and pressed, and the hot-pressed product discharged to the press cradle from the above-mentioned outlet. Heat pressing apparatus is characterized in that a fit of the product take-out apparatus.