JPH0653885B2 - Hot press machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hot press machine for producing a molded product by pressing and sintering metal powder, ceramic powder and the like.

"Prior Art" Generally, a molded body such as a metal powder or a ceramic is manufactured by a hot press machine. A hot press device A shown in FIG. 7 is known as a hot press device of this type. Explaining the hot press device A,
In the figure, reference numeral 1 is a furnace body. The furnace body 1 is provided with a door 2 on its side and a heat insulating material 3 stretched on its inner surface. Inside the furnace body 1, a rod-shaped lower ram 4 that moves in the vertical direction is arranged, and above the lower ram 4, a rod-shaped upper ram that moves in the vertical direction coaxially with the lower ram 4. 5 are provided. A pressing portion 6 that is pressed by the upper ram 5 and the lower ram 4 is attached between the upper ram 5 and the lower ram 4. The pressing unit 6 includes a die 8 provided with a sample filling unit 7, a lower punch 9 attached to a lower surface of the die 8 so as to support the sample filling unit 7, and a die 8
And an upper punch 10 fitted in the sample filling section 7 so as to be movable in the vertical direction. When the lower punch 9 and the upper punch 10 are pressed by the lower ram 4 and the upper ram 5, respectively, The sample filled between the lower punch 9 and the upper punch 10 is pressed.

Inside the furnace body 1, a die 8 is heated and a lower punch 9
Heaters 11, 11 for sintering the sample filled in the sample filling section 7 between the upper punch 10 and the upper punch 10 are provided.

[Problems to be Solved by the Invention] In the hot press apparatus A, since the die 8 is taken out of the furnace and filled with a sample, the die 8 is loaded into the furnace, so that the die 8 is not heated. Was consuming extra energy for. Further, in the above hot press apparatus A, the die 8 must be taken out of the furnace body 1 for filling the sample and for stamping out the molded body after sintering, which causes a problem of high handling cost. Further, in the hot press machine A, the upper punch 10 is movably provided on the die 8, but the lower punch 9 is provided on the die 8.
Since the lower punch 9 receives the frictional resistance of the powder sample at the time of pressing, the upper ram 5 is lowered by a hydraulic cylinder (not shown) and the sample is pressed down inside the die 8. Force is not applied evenly to the sample filled in
(The surface pressure on the side of the lower punch 9 becomes small), and due to the non-uniformity of the pressing density, the quality of the molded body deteriorates.

The present invention has been made in view of the above circumstances, and has a problem of how to realize a hot press device that solves the above drawbacks.

"Means for Solving Problems" The present invention relates to an upper ram that moves in the vertical direction, a die suspended from the lower end of the upper ram, and provided with a capsule fitting portion on the lower surface, and a capsule of this die. The sample capsule to be fitted in the fitting portion, the lower ram having an outer circumference which moves in the vertical direction and supports the sample capsule and transfers it to the capsule fitting portion of the die, and the periphery of the die. The sample capsule is fitted into the capsule fitting part of the die and the sample is supported by the support ring, and the sleeve is slidably fitted into the sleeve. It is composed of an upper punch and a lower punch that press the combined sample. The sample capsule is fitted into the capsule fitting portion of the die, and the upper punch and the lower punch are raised while supporting the die with the expansion tube. Lamb and lower la It is characterized in that the sample filled between the upper punch and the lower punch is pressed and sintered by pressing each of them with a press.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

First, in FIG. 1, reference numeral 16 is a vacuum container. The vacuum container 16 has a front chamber 17, a hot press moving chamber 18, and a cooling chamber 19 arranged side by side, and a hot press chamber 20 arranged side by side above the hot press moving chamber 18. Is. Hot press chamber 2 for this vacuum container 16
A heat insulating material 23 is stretched on the inner surface of 0, and the lower end portion is positioned in the hot press chamber 20 at the upper portion thereof.
An upper ram 24 that moves up and down by a hydraulic cylinder (not shown) is provided. A die 25 is suspended from the lower end of the upper ram 24. The die 25 is suspended by the upper ram 24 as a guide so as to be movable in the vertical direction, and a flange 25 attached to the lower end of the upper ram 24.
It is designed so that it does not fall out due to a. On the lower surface of the die 25, a tapered capsule fitting portion 26 for fitting a sample capsule described later is formed.

Here, the sample capsule 27 fitted into the capsule fitting portion 26 of the die 25 will be described with reference to FIG. The sample capsule 27 has a tapered vertical sleeve 29 supported by a support ring 28, and an upper punch 3
No. 0, a lower punch 31 is attached so as to be movable in the vertical direction. Particularly, in the lower punch 30, the mixing portion with the support ring 28 has a tapered shape so as not to fall down.
With this configuration, the sample is filled between the upper punch 30 and the lower punch 31 in the sleeve 29, and the sample is pressed by the upper punch 30 and the lower punch 31.

Further, as shown in FIG. 1, the sample capsule 27 is transferred to the capsule fitting portion 26 of the die 25 by the lower ram 32 provided in the hot press moving chamber 18 of the vacuum container 16 and fitted therein. It has become. The lower ram 32 is arranged coaxially with the upper ram 24 and moves in the vertical direction. This lower ram 32 has a spring 3
An expansion tube 34 that is supported by 3 and abuts on the sample capsule 27 is attached. Here, the upper ram 24 and the lower ram 32 press the internal sample of the sample capsule 27 by the upper punch 30 and the lower punch 32 of the sample capsule 27. Further, the heaters 35, 35 arranged around the die 25 heat the die 25 and sinter the internal sample of the sample capsule 27.

Below the die 25 in the hot press chamber 24, hearth supports 39, 39 for supporting the die 25 are provided.
Is provided. The hearth supports 39, 39 support the die 25 from below when the upper ram 24 and the lower ram 32 are both moved downward in a state where the sample capsule 27 is fitted in the die 25. When the hearth supports 39, 39 support the die 25, the upper ram 24 moves the upper ram 24 further downward to pull out the sample capsule 27 fitted in the die 25.

Front chamber 17 of the vacuum container 16 and hot press moving chamber 1
8. A rail 40 is laid in the cooling chamber 19. A transport carriage 41 for transporting the sample capsule 27 from the front chamber 17 to the hot press moving chamber 18 or from the hot press moving chamber 18 to the cooling chamber 19 is movably provided on the rail 40. The transport carriage 41 is made to travel by a transport chain (not shown) provided in each chamber.

An inlet door 42 and an outlet door 43 are provided at the inlet 17 of the vacuum chamber 16 and the outlet 19 of the cooling chamber 19, respectively.
Intermediate doors 44 and 45 are provided between the hot press moving chamber 18 and the hot press moving chamber 18 and between the hot press moving chamber 18 and the cooling chamber 19, respectively. The inlet door 42, the outlet door 43, and the intermediate doors 44 and 45 are for hermetically sealing the inside of the vacuum container 16 and always maintaining a constant environment. Further, in the front chamber 17 and the cooling chamber 19 of the vacuum container 16, holding members 50 and 51 for receiving and temporarily holding the sample capsule 27 from the transport carriage 41 are provided, respectively, and the gas introduction hole 5 is provided.
2, 53 and evacuation holes 54, 55 are provided respectively. Further, the hot press chamber 20 is provided with a vacuum exhaust hole 56 for reducing the pressure inside the chamber. Here, the gas introduction hole 5
2, 53 and the vacuum exhaust holes 54, 55 are for replacing the inside of the front chamber 17 and the cooling chamber 19 with gas and maintaining each chamber in a predetermined atmosphere.

Next, a method of using the hot press device having the above structure will be described with reference to FIGS. 1 and 3 to 6. First, the sample capsule 27 filled with the sample is carried into the front chamber 17 through the entrance door 42 and temporarily held by the holding member 50. Next, the inlet door 42 is closed, the inside of the front chamber 17 is made the same environment as the hot press chamber 20 by the vacuum exhaust hole 54, and then the intermediate door 44 is opened. Then, the sample capsule 27
Is moved to the hot press moving chamber 18 by the carriage 41, the intermediate door 44 is closed, and the upper door is positioned above the lower ram 32 as shown in FIG. When the sample capsule 27 is located above the lower ram 32, the lower ram 32 is moved upward so that the expandable tube 34 supports the sample capsule 27 as shown in FIG. By raising the ram 32, the sample capsule 27 is fitted into the die 25 as shown in FIG. Then, after the die 25 is floated, a stopper (not shown) is applied to the lower end of the lower ram 32 to fix the lower ram 32. Next, the upper ram 24 is lowered by a hydraulic cylinder, the upper punch 30 and the lower punch 31 are pressed, and the internal sample filled in the sample capsule 27 is pressed. As a result, the frictional resistance from the sample acting on the support ring 28 via the sleeve 29 is
The surface pressures of the upper punch 30 and the lower punch 31 are equalized by being reduced by the spring 33, and the substantially double-pressed state is realized.

Next, the internal sample is sintered by the heaters 35, 35. After pressing and sintering the sample, the upper ram 24,
The lower ram 32 is moved downward together to move the die 25 downward so that the die 25 is supported by the hearth supports 39, 39.
Place it on the top surface of. In this state, if the upper ram 24 is moved slightly downward as shown in FIG. 5, the sample capsule 27 will come off the die 25. Then, if only the lower ram 32 is moved downward, the sample capsule 27 moves downward together with the lower ram 32 as shown in FIG.

Next, by moving the lower ram 32 downward, when the sample capsule 27 returns to the position shown in FIG. 1, the sample capsule 27 is moved to the cooling chamber 19 by the carriage 41 and cooled. .

The sample filled in the sample capsule 27 is pressed and sintered by the method described above.

In the above hot press machine, the sample capsule 27 is transferred to the die 25 by the lower ram 32 while the die 25 is always kept in the hot press chamber 20 at room temperature, and the inner sample of the sample capsule 27 is transferred to the upper ram and the lower ram. The heater 35, 3 near the die 25 is pressed by the ram 32.
It was made to sinter by 5. In the above hot press machine, however, the energy for heating the die 25 from room temperature to the hot press temperature is not required, so that the energy consumed is small. Further, in the above hot press apparatus, since only the sample capsule 27 having the upper punch 30 and the lower punch 31 is conveyed, it is not necessary to handle the heavy die 25, and therefore the handling cost can be reduced. Further, in the above hot press device, since the upper punch 30 and the lower punch 31 are movably fitted to the sleeve 27, the sample filled in the sample capsule 27 is uniformly exerted with force, and a high-quality molded body is obtained. it can.

In the above hot press machine, the sample capsule was transported by the rail 40, the transport carriage 41, and the transport chain, but this transport may be performed by other means.

[Advantages of the Invention] As described in detail above, according to the present invention, the heater is arranged in the vicinity of the die, and the sample capsule is moved by the lower ram to the capsule fitting portion of the die. It is not necessary to reheat the die every time the replacement is performed, so that the sample can be pressure-sintered without wasting energy. Further, since the sample capsule having the upper punch and the lower punch is used for pressing, the sample is uniformly applied with force, so that a high-quality molded body can be produced and the handling cost thereof can be kept low.

[Brief description of drawings]

1 to 6 are views showing an embodiment of the present invention,
FIG. 1 is a front sectional view showing a schematic configuration of a hot press machine,
FIG. 2 is a front sectional view showing a sample capsule, and FIGS. 3 to 6 are explanatory views for explaining a method of using a hot press machine. FIG. 7 is a front sectional view showing a conventional hot press machine. 24 ... Upper ram, 25 ... Die, 26 ... Capsule fitting part, 27 ... Sample capsule, 28 ... Support ring, 2
9 ... sleeve, 30 ... upper punch, 31 ... lower punch, 32 ... lower ram, 34 ... telescopic tube, 35 ... heater.

Claims (1)

[Claims] 1. An upper ram that moves in the vertical direction, a die suspended from the lower end of the upper ram and provided with a capsule fitting portion on the lower surface, and a sample fitted to the capsule fitting portion of the die. It comprises a capsule, a lower ram that moves up and down and has an expansion and contraction tube on the outer periphery that supports the sample capsule and transfers it to the capsule fitting part of the die, and a heater arranged around the die. The sample capsule is fitted in the capsule fitting portion of the die and has a sleeve containing the sample supported by the support ring and an upper punch for pressing the sample slidably fitted in the sleeve. , A lower punch, the sample capsule is fitted to the capsule fitting portion of the die, and the upper punch and the lower punch are pressed by the upper ram and the lower ram while supporting the die by the expansion tube. , Same as above punch Heat pressing apparatus, characterized in that the sample filled in between the punch to press sintering.