DE8434891U1 - DEVICE FOR MELTING MATERIAL AND FILLING IN THE MELTED MATERIAL - Google Patents

Description

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-3- SCHÜTZ DENTAL GMBH , D ~ 6365 Rosbach 1

Device for melting material and pouring in the molten material

The innovation relates to a device for melting material and pouring in the molten material Material in a Gußfona according to the preamble of claim 1. In particular, the present relates Innovation below on such a device for use in a dental laboratory for processing stainless steel or gold and others Dental alloys *

Known devices of the type mentioned above see melting crucibles as containers for the material to be melted from fireclay, which are introduced into the device for melting and filling by a Load in the upper part of the device, in which there is a heating or fusion coil, out of the device is pulled out and the crucible is arranged so that it is surrounded by the heating coil. Another Drawer, which is located in the lower part of the device, is used to put a mold or muffle in to arrange the investment material used in dental technology below the crucible. There is also a sealing device provided, which expediently consists e.g. of two pressure chambers through which the two drawers be hermetically sealed with the housing of the device. There are also a gas supply valve and a valve provided for evacuating this sealed space, via which this space is evacuated for the melting process and is pressurized to pour the molten material into the mold. For the Control of the gas supply and evacuation is e.g.

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a temperature controller in connection with a ver j A delay relay is provided for switching the valves »j the heating voltage is supplied via an HF voltage supply, ' which is switched off with the help of the temperature controller «, fed to the heating coil.

To prepare for the melting and filling process, the device described above must be used the crucible with the material to be melted and the mold is introduced into the device via the two drawers, which is then sealed and evacuated through the corresponding valve. The material is then melted in the crucible and after switching off the heating voltage, the pressure is in the previously evacuated space so increased that the molten material from the crucible into the im lower part of the device located Gußfora is filled or injected. For this purpose, the Crucible made up of two in a vertical direction contiguous parts, open downwards. After completion of the filling process you can the mold and the crucible can be removed again via the two drawers. The GuBform becomes Removal of the solidified material destroyed and the Crucible cleaned for another melting process.

However, the device described has a number of disadvantages. E.g. Rei is The process of cleaning the crucible is very time-consuming, because small amounts of the molten material always adhere to the contact surfaces of the two crucible components and to close the Crucible are removed nuts. On the other hand, ent cracks in the contact surfaces quickly arise which also easily forms an oxide layer, so that the crucible, which is relatively expensive, after several

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one-time use is no longer usable and must be replaced. There is also the risk that the Fireclay melting pot cracks during the melting process and the molten material is distributed throughout the device, so that this may becomes unusable or at least has to be cleaned at great expense

Another disadvantage is that the distance between the crucible and the casting mold is relatively large, so that an optimal filling of the casting mold '' with the molten material is not guaranteed.

Furthermore, it is disadvantageous that two drawers are used to insert and remove the crucible and the casting mold, which are also difficult to insert into the device and are an obstacle are that the entire device is advantageous could be scaled down.

The object of the present innovation is to provide an improved device of the type mentioned at the beginning () Kind to create that no longer uses expensive and delicate crucibles, a simple and easy one convenient operation and has a compact design.

This object is achieved by the characterizing part of claim 1.

The device according to the innovation for melting a material and pouring in the molten one. Material in a mold used container that either placed on the mold or worked directly out of this in one piece. on this way is between the container in which the ma-

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material is melted, and the mold is unnecessary large distance more available. Furthermore, there is no longer a risk of inen such a container • r bursts and the melt runs out into the device 5, and such a container has the big one Advantage that it no longer needs to be cleaned, but how the mold is intended for single use only. In addition, removal and introduction are this container together with the mold very much un-10 more critical than placing the crucible in

I the heating area and the removal of the crucible

I () from this area of the device.

I Advantageous further training of the innovation are

I 15 specified in the parent claims.

I The devices according to the innovation for lowering the heating coil onto the casting mold and for sealing the device, each consisting of a pressure chamber 20, can be implemented in a simple manner and

have a small footprint. It Behäl- know i ter and mold on one single device

% in the device according to the innovation from one easily

I to be operated, swiveling chamber consists in

; J 25 the device is introduced and from this

can be removed, so that a second drawer is unnecessary and therefore also the sealing of the device

can be done better and more easily.

I 30 Instead of the expensive and sensitive melting | l gel made from fireclay (ceramic) can reduce the

I further containers after the innovation from in the Dentals' technology of the investment material used, from which the

; customary casting fora are made

i will be 35.

The innovation is explained in more detail below with reference to the drawings. Show it:

FIG. 1 a vertical section through the pre, ·., direction according to the innovation; ■

FIG. 2 shows a first embodiment of the neuerungs- - 'proper mold which ά a container for ma->

material recording contains; and f-

FIG. 3 a second embodiment of the new- | according to the container with a commercially available | ' available mold. f

The in FIG. 1 shown device 1 has three chambers 3, 4 and 8, each via Ven-? tile P ₂ * P4 and P _{1 are} connected to a gas supply and valves V, and Vg for evacuating chambers 4 and 8, these valves being connected to the chambers via corresponding lines. Between the chamber 8, which is located in the lower area of the device, and the chamber 4 in the upper area of the device, there is a hatched chamber 7 which can be swiveled out of the device by rotating about an axis 12, and above it a heating or fusion coil 5 which is located between the underside of the chamber 3 and a spiral support assembly 11 attached thereto. In the pivotable chamber 7 either a casting mold 6 with a container part 6a worked out from it (FIG. 2) or a casting mold with a container 6b placed thereon (FIG. 3) is arranged, the casting mold and container being made of the same material that is usually used for casting molds investment material used in dental technology, 'consist. Furthermore, the pivotable chamber 7 is connected to the above gas supply or to an argon gas supply via a pressure valve P ^ and a valve A *.

Chamber 4 is on the top of an I

Sight glass 2 closed, via a photocell 1 P attached 1st, and points on one side above I.

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of the sight glass an upper limit switch 9 and below the sight glass a lower limit switch 10 on.

The base of the chamber; 5 "on its underside the spiral support assembly 11 is attached, and the top surface of the chamber 8 is seen as facing upwards and downwardly movable pistons are formed, the top surface of the chamber 8 being the chamber above 7 moves.

The operation and operation of the above described The device emerges from the following part of the description:

First, the pivotable chamber 7 is pivoted out of the device 1 by rotating about the axis 12 and the mold 6 with the container part 6a or the attached container 6b is closed with the Melting material such as steel or gold arranged at a marked position in the chamber 7. is the chamber 7 is swiveled back into the device 1, so the cashier 8 is via the valve P ^ with a Pressure P _, _ "applied so that the chamber 7 air-

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is pressed tightly against the device 1. The chamber 3 is then via the valve P ₂ ^{with a pressure P} red k ⁶⁸ ^ ⁸⁰ * ¹¹⁰ ^ » ^{which is} lower than P _max » ao that the spiral support arrangement 11 with the heating coil 5 is lowered onto the casting mold 6. If the heating coil 5 reaches a minimum level on the casting mold 6, the further gas supply via the valve P _{2 is} switched off by the lower limit switch 10. The chamber 4 is then evacuated via the valve V 1, so that the device 1 is evacuated in the melting or fusion area. Furthermore, a small amount of argon gas is fed into the chamber 7 via the valve Ax

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fed in 12 and then switched on the HF voltage , so that the heating coil 5 is supplied with heating current via a supply line, not shown and the melting process begins. Hit a temperature controller, not shown, with the photocell 13 when a target temperature is reached, the power supply is switched off and the valve P ^ via a not shown Delay relay opened so that the chamber 4 is supplied with a gas flow via the gas supply that pushes the molten material into the mold. After the delay time of the relay has expired

'the gas supply is switched off, i.e. the valves P ^

and P ₁ closed and the chamber 8 evacuated via the valve Ί-, so that the chamber 7 is lowered again with the aid of the chamber 8 and the chamber 7 is thus released for pivoting out.

During a gas supply through the valve Pc after closing the valve P ^ the base rises the chamber 3 and thus the time spiral again up to a maximum due to the overpressure caused in this way, set by the upper limit switch 9 level, so that the chamber 7 for Eäitaufnahme the mold - 6 can be pivoted out of the device 1.

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The low argon pressure, which is supplied by the melting process through valve A, prevents compared to the vacuum in the melting range, that already during the melting process melted material in the mold is dripping.

For the gas supply to the valves P ₁ , P ₂ , P ^ and Pc, both air and, for example, argon gas can be used.
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The device described above therefore has the advantage of not having to introduce mine in addition

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Working melting pot that is expensive, easily fragile and difficult to clean, and instead uses a container to melt the material, which consists of the same inexpensive material as the mold and either as a container part 6a the mold 6 is worked out (FIG. 2) or as an additional container 6b (FIG. 3) on an already Commercially available mold, which consists of silicone, is placed, so that in both versions

'10 6a and 6b do the molten material directly

_{r the} mold arrives. The container part 6a and the container 6b _{? I} are cylindrical bodies with a diameter

which is smaller than the inner coil diameter

, and face upwardly open, conical in 15 opening, in its lower apex a transit \ flow port provided one for the molten material

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Chamber 3 for lowering the heating coil is

ä 20 does not require any additional space in the whole (f device 1 and the device for sealing the

Device 1, consisting of the chamber 8 and the gas supply with the valve P ₁ , is very easy to implement, so that the entire device can be manufactured in a more compact design than the conventional, commercially available devices of this type.

Furthermore, it is ensured by the swing-out originator of the present innovation a simple and safe operation of the device since the swinging of a chamber in comparison to the Slide _(two loading is easier handling

and direct access to the heating coil room is not «More is necessary.

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Claims (7)

Patent attorneys. · * .. ".. '..:.". : 10840 V "Reichelu. Reichel ':": \%' i \\\ '- Parksiraße 13 Frankfurt a. M. 1 SCHÜTZ DENTAL GMBH. D-6365 Roebach 1 e% claims 1. Apparatus sum melting material and pouring the molten material into a mold with a heater for heating the to. melting material in the container, wherein the container is in an evacuated space of the device during the melting process, which is previously closed airtight with a sealing device, with devices for evacuation \ this room and with facilities for feeding ; 10 of a gas into this space for filling the ; molten material from the container into the casting form, evacuating and supplying the Gases jiurcJr is controlled by a control device, and with means for entering and removing the mold and the container with the Ma material in or »out of the device, characterized that the container (6a; 6b) is placed directly on the mold (6), and that the device . 20 for entering and removing (7) takes up the mold with the container placed on it. 2. Device according to claim 1 , characterized in that that the container (6a) and the mold (6) are made in one piece. 3. Device according to claim 1, characterized in that that the device for entering and removing (7) consists of a pivotable can (7) which is around a vertical lateral axis (12) of the device (1) is rotatably mounted. Il I IIII * t i i it * * 15th 20th 4. Apparatus according to claim 1 _1, characterized in that that movement means (3, P ₂₎ is "old provided for combining the heater and the Gußfor the containers (3) bits of a movable base and a valve (P ₂₎ aufweiat a chamber for aaszufuhr, wherein on the outer side of the base a spiral support arrangement (11) is attached to which the heating device in the form of a heating spiral (5) is attached. 5. Device ntich claims 1 and 4, characterized, that the sealing device (8, P ₁ , V ₆ ) has a further chamber (8) in the lower area of the device (1) and valves (P ₁ , Vg) for gas supply (P ₁ ) and for evacuating (Vg) the chamber (8 ), wherein the device for entering and removing (7) the mold (6) and the container * (6a; 6b) is located above a movable top surface of the chamber (8) and when gas is supplied via the valve (P-.) against the housing of the device (1) is pressed. 6. Apparatus according to claim 1, characterized in that that the container (6au 6b) is a cylindrical body with a conical, upwardly opening and in the cone tip with a flow opening provided opening is. 7. Apparatus according to claim 1, characterized in that that the container (6aj 6b) and the mold (6) from The investment material used in dental technology is poured into a silicone mold. ■ I i ii * I it II i I