Metal founding – Means to shape metallic material – Pressure shaping means
Patent
1981-03-26
1983-12-06
Lin, Kuang Y.
Metal founding
Means to shape metallic material
Pressure shaping means
164286, 164289, B22D 1300
Patent
active
044187408
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a centrifugal caster, particularly for dental purposes, comprising a motor driven centrifuge arm which is rotatable about a vertical axis and includes a casting chamber which, if required, may be evacuatable and in which there is disposed a melting crucible and a casting muffle mounted in a muffle cage, the caster further comprising a balance arm likewise rotatable about the same vertical axis and provided with a counterweight. Centrifugal casters of the above-mentioned type operate at rotary frequencies from 350 to 500 rpm. Therefore, after clamping in the muffle, any imbalances existing must be eliminated before the machine is put into operation. The elimination of the imbalance, on the one hand, is in the interest of the smoothest possible operation without vibratory movements which may damage the machine; on the other hand, this avoids any adverse influence on the quality of the centrifugal casting to be produced. According to the prior art, differences in weight are eliminated in that the counterweight is moved manually until a possibly existing imbalance has been compensated.
The quality of the centrifugal casting additionally depends on the temperature constancy and possibly on the quality of the vacuum in the vacuum casting chamber which must be insulated and sealed in a suitable manner.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a centrifugal caster with which the above-mentioned prerequisites for producing high quality cast alloys can be met. It is an additional object of the invention to permit easy and fast operation of the centrifugal caster even if different size casting muffles are used.
This is accomplished by a centrifugal caster wherein the counterweight is firmly attached and wherein each muffle is held in an exchangeable muffle cage that is associated with the muffle according to its size and weight. The advantage of this centrifugal caster is that the previously required tedious and time consuming setting and adjusting work at the counterweight is no longer necessary and instead the balancing can be effected more accurately. The total weight of the muffle cage with the muffle inserted is such that upon rotation of the centrifuge arm, the latter is in equilibrium with the counterweight arm. The work required before the centrifugal caster is put into operation is limited advantageously to insertion of a casting muffle into the muffle cage which is then placed into the casting chamber. Each type of casting muffle has its associated specific type of muffle cage of a certain size.
In a modification of the invention, the casting chamber is provided with cavities which are adapted to accommodate the muffle cages. For centering the muffle in the muffle cage and to further facilitate operation, supports are provided in the muffle cage. The association of the casting muffle with a particular type of muffle cage then becomes unequivocal.
The required temperature constancy is assured by double-walled muffle cages and/or muffle cages provided with a heat insulating coating or material.
To facilitate removal of the hot muffle cages from the centrifugal caster, projections are provided at the outside of the muffle cage at which a suitable tool can engage to easily lift the muffle cage together with the casting muffle. In the simplest case, such tools could be holding levers with insulated handles and a tongue which can be pushed into the projection.
According to a further feature of the invention, operation is additionally facilitated if the casting chamber--particularly if it is a vacuum chamber--is provided with a cover which can be arrested by means of a lever lock. Advantageously the cover is provided with seals at its contact faces and is provided with a viewing pane.
However, the problem on which the invention is based is solved equally as well by a centrifugal caster in which the counterweight and the inserted casting muffle are each disposed in a guide carriage which can be moved horizontally over the a
REFERENCES:
patent: 1805168 (1931-05-01), Frist, Jr.
patent: 1976654 (1934-10-01), Carpenter
patent: 2752650 (1956-07-01), Bosna
patent: 2992463 (1961-07-01), Berger
patent: 3648762 (1972-03-01), Hill
patent: 4134445 (1979-01-01), Goodrich et al.
patent: 4280551 (1981-07-01), Ohara
Friedrich Ronald
Hammecke, deceased Werner
Fried. Krupp Gesellschaft mit beschrankter Haftung
Lin Kuang Y.
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