Metal founding – Process – With measuring – testing – inspecting – or condition determination
Patent
1992-09-14
1994-07-26
Batten, Jr., J. Reed
Metal founding
Process
With measuring, testing, inspecting, or condition determination
164 18, 164 38, 164 40, 164187, 164195, 1641541, 1641551, B22C 1110, B22C 1528
Patent
active
053320255
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for producing a series of casting molds or mold parts.
BACKGROUND ART
A method of this general kind is known from U.S. Pat. No. 4,248,290 (Hermes). According to this method, a closed-loop control arrangement is used to avoid impact damage when newly-produced molds are joined to a string of previously produced molds, and/or to control the dimensions of the molds in the-direction of conveying said string.
When producing casting molds or mold parts according to this known method, problems may arise due to variations in the hardness of the produced molds or mold parts, depending on the degree of compaction, with which the compacting operation is carried out. In many cases, these variations are not detected at a sufficiently early stage to make it possible to prevent them from causing severe problems.
Thus, the molds or mold parts may be too hard and dense, thus partly making it difficult to separate the molds from the castings, partly making it difficult for, gases produced during the casting operation to escape, thus causing gas porosities in the castings.
On the other hand, the molds or mold parts may be too brittle or soft, in which case they will be unable to withstand the impact of the molten casting metal being poured into the pouring cup.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide a method of the kind initially referred to, with which the above-mentioned disadvantages can be reduced or eliminated, and this object is achieved in accordance with the present invention by filling a molding cavity with un-compacted particle material, pressing side walls of the cavity together to compact the material, measuring the volume of the mold before and after the step of pressing, comparing the measurements of the mold to desired measurements and automatically adjusting pressure or quantity of particle material before forming a new mold or mold part. In this manner, the variations are detected at an earlier moment in time, considerably closer to the moment in time, in which they actually arise, than with the previously known methods of this kind.
The present invention also relates to an apparatus for carrying out the method of the invention.
According to the invention, the apparatus comprises a molding cavity for compacting a casting mold bounded by at least two walls, one of which may be pressed toward the other and one of which carries a pattern corresponding to that of the desired mold part. The apparatus further includes filling, pressing sensing and control means which allow for automatic adjustment of molding conditions.
Advantageous embodiments of the method and the apparatus according to the present invention are explained in the following detailed portion of the present specification.
BRIEF DESCRIPTION OF THE DRAWING
In the following, the present invention will be explained in more detail with reference to the drawing, in which FIGS. 1 and 2 diagrammatically show an apparatus for carrying out the method according to the invention,
FIGS. 3A, 3B and 3C diagrammatically show the production of molds and the placing of same in a mold string, later passing through a pouring station for molten metal, and
FIG. 4 shows an action sequence diagram corresponding to an exemplary embodiment of the method according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In the apparatus shown in FIG. 1, a supply chamber 1, adapted to receive sand from a sand supply container 1a, is used for temporarily storing mold sand 2. During the actual molding operation, air under pressure is supplied to the space above the sand 2 through air channels 3, which are connected to a compressed-air tank 6 through a valve 6a adapted to be controlled by a timer/controller 6b in a manner partly explained in U.S. Pat. No. 4,791,974 (Larsen), partly--with special reference to the present invention--to be explained in more detail below. An outlet 4 connects the lower part of the supply chamber 1 to a mold chamber 8. immediately above the ou
REFERENCES:
patent: 3744550 (1973-07-01), Larkin
patent: 4248290 (1981-02-01), Hermes
patent: 4437507 (1984-03-01), Seeley
patent: 4791974 (1988-12-01), Larsen
patent: 4853868 (1989-08-01), Medwin
patent: 4997025 (1991-03-01), Post et al.
Batten, Jr. J. Reed
Dansk Industri Syndikat A/S
LandOfFree
Method of and apparatus for producing a series of casting molds does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of and apparatus for producing a series of casting molds , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of and apparatus for producing a series of casting molds will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1048187