JPS62196305A - Working device for metallic thin sheet - Google Patents

Abstract

PURPOSE:To continuously and efficiently obtain a sheet of a difficultly workable material such as heated intermetallic compd. having a good surface characteristic and thickness accuracy by rolling the fine powder of the difficultly workable material or forming the same with a press at the time of extruding said fine powder and working by utilizing a superplasticity. CONSTITUTION:The fine powder 3 of the intermetallic compd., etc., supplied into a heating vacuum furnace 1 is supplied and stored into a powder storage vessel 8 while the powder is heated and agitated. The powder is stored and heated therein and is supplied at a constant rate into a metallic mold 15. Then the mold 17 descends and while the powder is heated to the prescribed high temp. and constant temp. state up to the superplasticity generating temp. by a heating coil 18, the powder is extruded at an extra-low speed and is made into a sheet-shaped material 21 to be worked. The material passes a ceramic die 20 and the finer crystal grains are formed by recrystallization. The material is heated at the high temp. and constant temp. up to the superplasticity generating temp. by a heating coil 26 and is passed between ceramic work rolls 25. The material 21 is rolled to a sheet shape at an extra-low speed down to a prescribed sheet thickness by utilizing the superplasticity. A quasi superplasticity may be utilized in place of the superplastic phenomenon.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a thin plate processing apparatus for manufacturing a thin plate of a difficult-to-process material such as an intermetallic compound.

[Prior Art] It has been confirmed that extremely hard, brittle, and difficult-to-process materials such as intermetallic workpieces can be formed by utilizing superplastic phenomena by isothermal closed forging, hot extrusion, and the like. Here, the superplastic phenomenon refers to an abnormally large deformation phenomenon observed in metal materials and the like under special conditions.

An example of a conventional process for forming using superplasticity is to extrude fine powder such as a nickel-based alloy heated to a predetermined temperature and solidify it using an extrusion die to refine the crystal grains, thereby producing superplasticity. Using this method, parts were directly molded using constant-temperature molding, and then heat treated to improve strength.

[Problems to be solved by the invention] However, the conventional means described above has poor production efficiency because continuous production cannot be performed, and since the parts are forged, the surface shape and plate thickness accuracy are insufficient and polishing is required. There were problems such as the need for finishing by etc., which required extra steps.

The present invention has been made in view of the above-mentioned circumstances with the object of making it possible to continuously and accurately manufacture thin plates of materials that are difficult to process, such as intermetallic compounds.

[Means for Solving the Problems] The present invention provides an apparatus for heating fine powder of a difficult-to-process material such as an intermetallic compound, an extrusion apparatus for extruding the heated fine powder, and a superplastic material for extruded material. It is equipped with a device for rolling or pressing using phenomenon or quasi-superplastic dyeing.

[Function] Fine powder of difficult-to-process materials such as intermetallic compounds is heated by a heating device, extruded by an extrusion device, and rolled or pressed by a rolling or pressing device using superplastic phenomenon or quasi-superplastic dyeing. Pressed.

[Example] Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

The figure shows one embodiment of the present invention, in which 1 is a batch type heating vacuum section, and a fine powder 3 of extremely hard, brittle and difficult-to-process materials such as intermetallic compounds is supplied from a potper 2 into the heating vacuum furnace 1. ,
It is heated by a heating coil 4 and stirred by a stirrer 5 so that the whole is heated uniformly.

At the bottom of the heating vacuum furnace 1, a powder stopper 6 is disposed so as to be openable and closable, and a vacuum valve 7 is also disposed, and a powder storage container 8 is disposed below the vacuum valve 7. The powder storage container 8
A load cell 9 is installed to measure the amount of fine powder stored.
is provided, and a heating coil 10 is provided to heat the fine powder.

A powder stopper 11 is disposed at the bottom of the powder storage container 8 so as to be openable and closable, and the fine powder discharged from the powder storage container 8 passes through a chute 12 equipped with a vibration device 13 and is quantitatively extruded by a rotary feeder 14. It can be supplied into the mold 15 of.

A mold 17 that can be moved up and down by a hydraulic piston 16 is slidably fitted into the mold 15 . The mold 15 is also equipped with a heating coil 18 for heating the fine powder in the mold 15 and a vacuum bellows 19 for preventing air from flowing into the mold 15.

A ceramic die 20 is disposed at the bottom of the mold 17, and a heating coil 22 is attached to the ceramic die 20 for heating a workpiece 21 extruded from the mold 15 and formed into a plate shape. .

Further, on the back side of the ceramic die 20, a block 24 made of heat-resistant steel is provided with cooling holes 23 through which a cooling medium circulates.
is installed.

A ceramic work roll 25 is disposed below the ceramic die 20 to roll the plate-shaped workpiece 21 extruded from the ceramic die 20 to a predetermined thickness by utilizing a superplastic phenomenon. The roll 25 has a built-in heating coil 26 for heating the workpiece 21 to a temperature at which a superplastic phenomenon occurs. Further, a heat treatment furnace is provided below the ceramic work roll 25 to improve the strength of the rolled plate.

In the figure, reference numerals 27, 28, and 29 are bases connected to a vacuum pump, and the spacing between the ceramic dice 20 and the gap between the ceramic work rolls 25 can be adjusted as appropriate.

A fine powder 3 such as an intermetallic compound supplied from a hopper 2 into a heating vacuum furnace 1 is heated by a heating coil 4 and stirred by a stirrer 5 to bring the whole to a substantially uniform constant temperature state, and a powder stopper 6 is opened, and the fine powder 3 in the heating vacuum furnace 2 is supplied to the powder storage container 8 and stored therein. Also in the powder storage container 8, the fine powder is heated to a constant temperature by the heating coil 10.

When the powder stopper 11 is opened, the fine powder in the powder storage container 8 falls through the chute 12. The vibrating device 13 vibrates the chute 12 to prevent the inside of the chute 12 from being blocked, and the rotary feeder 14 causes the fine powder to fall through the chute 12. It is supplied quantitatively into the mold 15.

The amount of fine powder supplied to the mold 15 is detected by the load cell 9.

When a predetermined amount of fine powder is supplied into the mold 15, the mold 17 is lowered by the hydraulic piston 16, and the fine powder is heated to a predetermined high temperature and constant temperature state by the heating coil 18 to the temperature at which the superplastic phenomenon occurs. The plate-shaped workpiece 21 is extruded at a low speed, passes through a ceramic die 20, recrystallizes the fine particles, and is heated by the heating coil 26 of the ceramic work roll 25. It is heated at a high temperature and constant temperature to the temperature at which the superplastic phenomenon occurs, is passed through a ceramic work roll 25, and is rolled into a plate at a very low speed to a predetermined thickness by utilizing the superplastic phenomenon. Further, the rolled plate is sent to a heat treatment furnace to coarsen the crystal grains and increase the strength.

During the above-mentioned rolling, the heating vacuum furnace 1, powder storage container 8, and chute 12 are evacuated by a vacuum device through the die 27, 28, and 29, but this is done to prevent air from remaining between powder particles such as intermetallic compounds. It's for a reason.

By rolling an intermetallic compound or the like using the superplastic phenomenon as described above, a plate of an intermetallic compound or the like having good surface texture and plate thickness accuracy can be obtained continuously and efficiently.

Furthermore, since there is no relative slippage between the ceramic work roll 25 and the workpiece 21, wear of the work roll 25 is reduced and its lifespan is extended. Furthermore, in the case of superplastic processing,
Since the speed is slow, there is no impact, and it can be used even with ceramic work rolls.

In addition, in the embodiments of the present invention, a case where a plate is rolled using a superplastic phenomenon has been described, but it can also be carried out using a rolling press, and a quasi-superplastic phenomenon may be used instead of a superplastic phenomenon. Of course, it is applicable not only to intermetallic compounds but also to titanium-based alloys and nickel-based alloys, and that various changes can be made without departing from the gist of the present invention. .

[Effects of the Invention] According to the thin plate processing apparatus of the present invention, it is possible to easily obtain a plate made of a difficult-to-process material with good surface shape and thickness accuracy, eliminating the need for processes such as polishing, and facilitating continuous production. Since this is possible, various excellent effects such as improved production efficiency can be achieved.

[Brief explanation of drawings]

The figure is an explanatory diagram of an embodiment of the present invention. In the figure, 1 is a heating vacuum furnace, 3 is a fine powder, 4 is a heating coil, 8 is a powder storage container, 10 is a heating coil, 15 is a mold,
16 is a hydraulic piston, 17 is a mold, 18 is a heating coil,
20 is a ceramic die, 21 is a workpiece, 22 is a heating coil, and 25 is a ceramic work roll.

Claims (1)

[Claims] 1) A device for heating fine powder of difficult-to-process materials such as intermetallic compounds, an extrusion device for extruding the heated fine powder, and a device for rolling or rolling the extruded material using superplastic or quasi-superplastic phenomena. A thin plate processing device characterized in that it is equipped with a pressing device.