Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1992-11-12
1995-10-24
Batten, Jr., J. Reed
Metal founding
Process
Shaping liquid metal against a forming surface
164404, B22D 2900
Patent
active
054602190
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention concerns a process and devices for decoring casting cores.
BACKGROUND ART
The elimination of casting cores with a rather complex structure very often requires the use of a pneumatic hammer allowing to subject the part to repeated shocks which may break the adherence of sand on the walls.
Initially, this operation was done manually holding the pneumatic hammer and relying on the dexterity and know-how of the operator, which resulted in some disparities in the result achieved and in the rejection of a rather large percentage of finished pieces not completely decored.
In order to rationalize this operation and to protect the operator from resulting nuisances such as noise and dust, the use of devices such as those described in French patent No. 2.311.617 and European patent No. 0.144.031 was considered. Those devices basically consist of a frame onto which one or more decoring parts are mounted while said frame is subject to vibrations likely to cause the unsticking and splitting of the cores.
In order to increase even further the performance of this device, the French patent No. 2.470.652 provides for several frames on a polygonal roundabout driven in step rotation before a loading station and an unloading station diametrically opposite.
However, it should be noted that the vibrations thus regularly applied to the pieces do not ensure adequate splitting of the core, or full unsticking of all fragments of said core.
The result of this situation is a certain reluctance from the designers to use complex designs which may hinder such decoring although this would be highly desirable for the future use of the piece.
This problem is of special significance for internal combustion motor cylinder heads where the most complex designs are very often impossible to fully decore, with the trouble this implies in assembly lines and the fact that designers give up on such designs.
The purpose of this invention is to correct all those disadvantages. This invention, as described, solves the problem of defining a process and creating devices with which the cores cannot only be split up but also fully disintegrated while causing an erosion effect which leads to the unsticking of all sand particles before full gravity discharge in one single phase, preferably without repositioning the piece on its support.
SUMMARY OF THE INVENTION
The process under the invention is mainly characterized by the sequence of the following operations: piece is held against a pneumatic cushion to make the core split up, disintegration of the core and a sandblasting effect of the casting inside walls,
Under one embodiment of the process, the reciprocating swinging results from the combination of a longitudinal reciprocating motion and a transverse reciprocating motion.
According to a first alternative solution of the above embodiment, the transverse reciprocating motion is applied in a plane parallel to that in which the longitudinal motion is applied.
According to a second alternative solution of the same embodiment, the transverse reciprocating motion is applied in a plane perpendicular to that in which the longitudinal motion is applied.
According to a special definition of the process, the swinging of the piece is achieved with an amplitude and frequency respectively adjustable from greater than 0 to 10 cm and 0 to 85 Hz.
According to another special definition of the process, the swinging of the piece is achieved in combination with the taking up of a play J, thus introducing an additional inertia effect on the sand mass.
Regardless of the embodiment and definition of the process, the amplitude and frequency of the piece swinging vary during the swinging motion according to rules determined on the basis of the inside design of the piece and the size of the cavities.
According to another definition of the process, the swinging frequency is irregular and random.
An embodiment of the basic process under the invention is characterized by the fact that shocks at high frequency are applied directly onto the piece thr
REFERENCES:
patent: 4185681 (1980-01-01), Church et al.
patent: 4637558 (1987-01-01), Jenzsch et al.
patent: 4718473 (1988-01-01), Musschoot
Massin Daniel
Massin Marcel
Batten, Jr. J. Reed
Massin Limited Company
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