Metal founding – Means to shape a forming surface – Including means for compacting particulate fluent mold...
Patent
1981-09-28
1984-05-29
Lin, Kuang Y.
Metal founding
Means to shape a forming surface
Including means for compacting particulate fluent mold...
164192, 164198, B22C 1506, B22C 1520
Patent
active
044508883
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to foundry practice and has particular reference to moulding plants.
BACKGROUND ART
There is known in the art a moulding plant which comprises a moulding machine and a turnover and withdrawal apparatus which includes a bed, a turnover device, a gripping device for holding moulding boxes during turnover, and a pattern withdrawal table. This plant produces moulds formed with intricate-shaped patterns.
The moulding process of said plant involves alternate use of two patterns: one for top half-moulds or copes and the other for bottom half-moulds or drags. Cope and drag moulding boxes are delivered to the plant in the appropriate sequence. As the moulding table rises during operation, it receives first a pattern and then a moulding box, the latter being seated over the pattern. The moulding box is filled with sand which is compacted by jolting. During the jolting operation the press plate is delivered into the working position. On the upstroke of the squeezer piston incorporated in the moulding table the upper layers of the sand in the moulding box are forced against the squeeze board, whereby the sand is compressed. The latest modernized machines are capable of performing sand compression simultaneously with or subsequent to jolting. After the sand packing is accomplished, the pattern complete with the half-mould in the moulding box is placed onto rollers and the jolting table is lowered. The pattern with the half-mould is transported into the turnover and withdrawal apparatus, which is made in two sections. The pattern with the half-mould is gripped in the turnover device and turned through 180.degree. so that the pattern is on the top. The withdrawal table arrives underneath the half-mould. The grips holding the half-mould to the pattern plate release and the half-mould lowers together with the withdrawal table, leaving the pattern in the turnover device and thereby accomplishing its withdrawal. The pattern is returned into the initial position by rotation of the turnover device and then is carried by a grip onto the jolting table.
The moulding plant under consideration is disadvantageous in that the working capacity thereof is low because the pattern outfit has to make many opposing strokes. A further disadvantage is that the plant includes a large number of actuating mechanisms and occupies large floor space.
Also known in the art is a moulding plant (see catalog "Moulding Plants", No 12, published in 1970, NIIMASH Publishers, Moscow, pp. 79-82) comprising a movable sandslinger and a turnover and withdrawal apparatus having a turnover mechanism and a pattern withdrawal mechanism. The turnover mechanism is made in the form of two disks spaced apart and mounted on rollers. The disks are connected with a drive designed to turn the turnover and withdrawal apparatus in a vertical plane about the horizontal axis of the disks. Located between the disks in symmetry with their horizontal axis and parallel thereto are two roller conveyor sections which are mounted on crossmembers installed between the disks. The pattern withdrawal mechanism comprises power cylinders disposed on the crossmembers between the turnover mechanism disks for the purpose of withdrawing patterns together with a pattern plate.
The sandslinger is arranged to move on the principle of an overhead travelling crane.
The sandslinger and the turnover and withdrawal apparatus are located separately one after the other.
The prior-art moulding plant operates as follows.
A moulding box is placed on a pattern plate by means of a crane or another hoisting device. Then the pattern complete with the moulding box is delivered underneath the sandslinger by means of live rollers. To enable the sandslinger to feed sand at any point of the mould being formed, it is arranged to travel in the manner of an overhead crane. To this end, use is made of two trolleys. One trolley mounts the sandslinger and moves across the moulding box, the other trolley moves along the moulding box. After the half-mould is made, it is de
REFERENCES:
patent: 3939899 (1976-02-01), Kawai
"Moulding Plants," NIIMASH Publishers, Moscow, No. 12, 1970, pp. 79-82.
Khristov Vladimir A.
Onufriev Inokenty A.
Sergeev Evgeny A.
Shibanov Dmitry A.
Batten, Jr. J. Reed
Lin Kuang Y.
NPO "Viilitmash"
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