KR20000017093U - Heat-insulated chamber of hot press system - Google Patents

Abstract

The present invention relates to an adiabatic chamber of a hot press system.

The present invention has a base, a lower frame installed on the upper portion of the base, a lower center frame continuously installed on the upper portion of the lower frame, a lower ram installed to move up and down on the lower center frame, and the lower ram It is fixed to the upper portion of the lower punch to move up and down, and the insulating chamber is installed on the upper portion of the lower center frame to prevent heat loss inside the chamber, thereby the effect of forming a large permanent magnet In addition, the internal die is made of cemented carbide to reduce the price of the device, and at the same time, it has the strength to withstand the external force when pressing the upper and lower parts.

Description

Insulation chamber of hot press system {HEAT-INSULATED CHAMBER OF HOT PRESS SYSTEM}

The present invention relates to an adiabatic chamber of a hot press system. More specifically, a preform for producing a rare earth permanent magnet is processed into a chip (CIP: Cold Isostatic Process) and the inside of the molding apparatus is vacuumed. The present invention relates to a heat insulating chamber of a hot press system for forming a molded body by simultaneously pressing the upper and lower rams by installing a heat insulating chamber capable of maintaining a heat insulating state at the same time.

In general, rare earth elements are already known as compositions of permanent magnets based on transition metals (abbreviated herein as TM) and boron (B), where rare earth elements are neodymium (Nd), Or praserdium (Pr) or both elements, and as the transition metal, iron (Fe) or a mixture of iron and cobalt (Co). Preferred compositions thereof include the Re2TM 14B phase, where TM is one or more transition metal elements comprising iron.

Known methods for the production of such alloys include rapid solidification processes and overquenching in which a molten amorphous structure is isotropic and obtains a crystalline microstructure with permanent magnet properties. There is a method of manufacturing the alloy (quench ribbon).

It is also known to anneal quenched ribbons that do not have an appropriate coercive force, which is over-chapped, to grow grains by annealing at an appropriate temperature, thereby inducing an appropriate coercive force.

That is, alloys having an over-etched and essentially amorphous structure are processed at high temperatures and plastically deformed, and plastically deformed shaped bodies have a fundamentally higher magnetic energy than rapidly solidified alloys because of the result of grain growth and crystallization. It forms a permanent magnet.

On the other hand, the method of manufacturing permanent magnets by the known sintering method of the previous method has the disadvantage that the material is expensive and easily oxidized, since the powder material has to be processed at a high temperature, while hot compression molding is rapidly solidified. Re-Fe-B basic isotropic alloy particles are essentially transformed into high-density bodies, and the hot compression plastic processing method that transforms the hot-compression molded isotropic alloy particles into anisotropic molded bodies is a manufacturing method that obtains excellent anisotropic permanent magnets. It is widely used.

Hot compression molding technology places magnetic powder of amorphous and / or fine crystal grains obtained by rapid solidification of molten alloy into a mold, and pressurizes the magnetic powder to obtain a densified isotropic magnet compact. In this case, the hot press device is used. Hot compression plastic processing by the hot press (HOT PRESS) system is to produce an anisotropic magnet (anisotropic magnet) by putting the isotropic molded body into the mold and lowering the upper ram at a temperature of about 700 ° C.

In particular, a method of injecting argon gas at a high pressure is known to suppress the oxygen affinity of Nd in the process of the hot compression plastic working deformation, and another method is to cover the entire mold by covering a large chamber with the entire mold. In addition, the hot compression plastic working was carried out in a vacuum state by maintaining the vacuum state.

However, the hot press system of the above structure is made by pressing the press ram for manufacturing the molded body from the top to the bottom.

When the press ram presses the molded body, the inside of the chamber becomes a high temperature and a high pressure in a vacuum state, but the temperature cannot be maintained even though the temperature generated in the chamber plays an important role in manufacturing the permanent magnet. there was.

In addition, the conventional press system has a high heat loss and the working environment is also impossible to produce a large permanent magnet.

In addition, the mold has a problem that the price is expensive because all of the die must be manufactured with cemented carbide.

Accordingly, the present invention has been devised to solve the above problems, by installing a heat insulating plate in the chamber during the operation of the upper and lower rams of the hot press system for forming a permanent magnet to reduce the heat loss inside the chamber. The purpose of the present invention is to produce a large permanent magnet by preventing and improving the working environment, and to provide a low cost by separately manufacturing a mold die.

1 is a front view showing the structure of the hot press (HOT PRESS) system of the present invention

Figure 2 is a cross-sectional view showing the insulation chamber structure of the hot press (HOT PRESS) system of the present invention

*** Explanation of symbols on the main parts of the drawing ***

10: base 12,13: upper and lower frame unit

14,15: lower center frame 16: fixed bolt

18: cover 20: lower ram

24: chamber 26: water jacket

28: internal die 30: external die

32: upper punch 34: upper ram

36: supply pipe 38: receiving container

40: coupler 42: cooling coil

44 outlet 46 cylinder

48: material supply box 50: magazine

52: cover 54, 68: guide bar

56,66: ball screw 58,76: motor

60: rack pinion chuck 62: gripper

64: bracket 70,82: cylinder rod

72,80: cylinder 74: transfer plate

78: moving base 97,98: upper and lower holder

100: insulated chamber 102: material discharge device

104: material feeding device 106: thermocouple damage prevention jig

108: press system

The heat insulation chamber structure of the hot press system of the present invention has a base, a lower frame installed on the upper portion of the base, a lower center frame continuously installed on the upper portion of the lower frame, and a lower center frame. The lower ram is installed so as to move up and down, the lower punch is fixed to the upper portion of the lower ram up and down operation, and characterized in that it is composed of an insulating chamber installed on the upper portion of the lower center frame.

The heat insulating chamber may include a water jacket installed on an upper portion of a lower center frame, an heat insulating plate installed on an upper portion of the water jacket to block heat to the outside, a sub plate installed on an upper portion of the heat insulating plate, and an upper portion of the sub plate. And an inner die installed at an outer side of the lower ram, and an outer die installed at an outer side of the inner die.

The material of the inner die is characterized in that the die formed of cemented carbide.

Hereinafter, with reference to the accompanying drawings will be described in more detail the structure of the thermal insulation chamber of the hot press system of the present invention.

The present invention has a base 10, a lower frame 12 installed on the upper portion of the base 10, a lower center frame 14 continuously installed on the upper portion of the lower frame 12, and the lower center A lower ram 20 installed on the frame 14 to move up and down, a lower punch 22 fixed to an upper portion of the lower ram 20 to move up and down, and an upper portion of the lower center frame 14. It is composed of a heat insulating chamber 100 installed in the, the heat insulating chamber 100 is installed on the water jacket 26 and the upper portion of the lower center frame 14, the water jacket 26 to the outside A heat insulating plate 92 for blocking heat, a sub plate 94 provided on an upper portion of the heat insulating plate 92, and an upper portion of the sub plate 94, and provided outside the lower ram 20. An inner die 28 and an outer die 30 installed outside the inner die 28, wherein the inner die 28 is formed of a cemented carbide material.

Figure 1 is a front view showing the structure of the hot press (HOT PRESS) system of the present invention, Figure 2 is a cross-sectional view showing the insulation chamber structure of the hot press (HOT PRESS) system of the present invention.

First, a hot press system for forming a rare earth permanent magnet includes a base 10, upper and lower frame units 12 and 13 installed on the base 10, and upper and lower frame units 12. And the upper and lower center frames 14 and 15 continuously installed between the upper and lower center frames 14 and 15, and the insulating chamber 100 which is installed between the upper and lower center frames 14 and 15 to maintain a vacuum for forming permanent magnets. , A material feeding device 104 for supplying a material, and a material discharge device (not shown) for discharging the molded permanent magnet.

Looking at the hot press system of the above structure in more detail, the lower center frame 14 is installed on the upper portion of the base 10, the upper portion of the lower center frame 14 by the fixing bolt 16 The cover 18 is provided, and the lower ram 20 is installed inside the cover 18 so as to move up and down.

At this time, the lower punch 22 for pressing and molding the permanent magnet is installed on the upper portion of the lower ram 20 to press the molded body from the inside of the chamber unit 100 made of vacuum.

The upper center frame 15 is provided on the upper portion of the insulating chamber 100 formed as described above to face the lower center frame 14, and the upper center frame 15 is covered by a fixing bolt 17. 19) is provided, the upper ram 34 is provided to move up and down inside the cover 19, the upper punch 32 for pressurizing the molded body is provided to move up and down.

In addition, the molded body pressurized by the upper and lower rams 34 and 20 as described above includes a water jacket 26 provided inside the chamber unit 100, a heat insulating plate 92 provided on an upper portion thereof, and an upper portion of the molded body. The upper and lower portions of the upper and lower rams 34 and 20 are respectively supplied to the subplate 94, the inner die 28 provided on the upper portion of the sub plate 94, and the outer die 30 provided on the outer side thereof. It is pressurized and molded by the upper and lower punches 32 and 22 provided.

At this time, the upper and lower punches 32 and 22 respectively installed at the ends of the upper and lower rams 34 and 20 are fixed to the upper and lower holders 98 and 97 by fixing bolts 96, and the rare earth permanent magnets. Simultaneously moving in the up and down direction to form the mold, the molded body is simultaneously pressed to form a permanent magnet.

And, on the left side of the upper and lower frames 12 and 13, a material feeding device 104 for supplying a molded body 120 for forming a permanent magnet is provided.

The material feeding device 104 is provided with a bracket (65) on the upper portion of the moving base 78, the feed plate 74, the motor 76 is installed on the bracket 65 is a ball screw (66) It is coupled to the rear end of.

At this time, the transfer plate 74 is provided with a cylinder 72 having a gripper 62, a material supply box 48 is installed on the right side thereof, the material loaded in the magazine 50 supply pipe It is installed so that it can supply through 36.

Insulating chamber of the hot press system of the above structure can prevent the separation during the pressing operation by the external force operation of the inner die 28 made of cemented carbide embedded in the mold die, it is installed on the lower part of the sub-plate By preventing the heat insulating plate from exhausting the heat inside the chamber made of vacuum to the outside air, the degree of product and magnetic density are excellent, and there is an advantage of improving reliability.

As described above, the heat insulation chamber of the hot press system of the present invention can prevent heat loss inside the chamber due to the heat insulation plate, and thus, the large-size permanent magnet can be formed, and the inner die is made of cemented carbide. In addition, there is an advantage that can lower the price of the device and at the same time has the effect of having strength to withstand external forces during the upper and lower pressing.

Claims (3)

A base, a lower frame installed on an upper portion of the base, a lower center frame continuously installed on an upper portion of the lower frame, a lower ram installed to move up and down on the lower center frame, and an upper portion of the lower ram. Insulation chamber of the hot press system (HOT PRESS) system, characterized in that it is composed of a lower punch fixed and lifting up and down, and the insulating chamber installed on the upper portion of the lower center frame. The water insulating chamber of claim 1, wherein the heat insulating chamber comprises: a water jacket disposed on an upper portion of the lower center frame; an insulating plate disposed on an upper portion of the water jacket to block heat to the outside; And an inner die installed on an upper portion of the sub plate, and an outer die installed on an outer side of the lower ram, and an outer die installed on an outer side of the inner die. 3. The insulated chamber of a hot press system according to claim 2, wherein the inner die is made of cemented carbide.