Metal founding – Means to shape a forming surface – Including means for compacting particulate fluent mold...
Reexamination Certificate
1999-12-03
2002-02-12
Mackey, James P. (Department: 1722)
Metal founding
Means to shape a forming surface
Including means for compacting particulate fluent mold...
C164S203000, C425S432000
Reexamination Certificate
active
06345662
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
This invention relates to an automatic vibration molding machine for green sand molding for casting.
(2) Prior Art
Conventionally, adopted types of green sand molding machines are roughly divided into three, i.e., a jolt type, a squeeze type and a blow type.
A jolt type green sand molding machine comprises a flask placed on a table of a molding machine in which sand is filled, an air cylinder installed under the table to which compressed air is blown, and a piston combined with the table. The piston is blown up together with the table by the compressed air, and the table falls free by exhausting air at a certain level of height. Then, the table and the cylinder collide with each other and the sand in the flask is squeezed down toward the pattern underneath by innertial force of the sand itself. Thus, the jolt type is provided with a basic mechanism of a conventional green sand molding machine.
The squeeze type green sand molding machine comprises a mechanin which the green sand in a flask is pressed downward into the flask by a pnewmatics by an air cylinder or oil hyraulics (instead of these means there are means using a diaphragm). Both driving types, in anyway, use a pressure plate whose size is a little smaller than the inner size of the flask (The cylinder and the pressure plate can be plural).
Otherwise, the squeeze type green sand molding machine is provided with a squeeze mechanism in which a flask filled with green sand on the pattern is raised by compressed air or oil hyraulics of a squeeze cylinder together with the table of the upper part of a cylinder toward the pressure plate which is fixed above the flask.
The blow type is a method of filling green sand in a space between the pattern of the flask and the pressure plate by utilizing an air flow. It is known that there are a blow-in and pressure type and a decompression and vaccum type.
The above-mentioned conventional green sand molding machine is a combination of a main mechanism for clamping a flask and a drafting mechanism for separating the clamped flask and the pattern (a stripper type in which a flask is drafted upward from the fixed pattern and a pattern-draw type in which the pattern is drafted downward from the fixed flask), and various types of molding mechines such as a flask type, and a snap flask type in which the flask is installed in the molding machine.
In the molding machine simply having functions of a jolt type and a squeeze type, a match plate of upper and undersurface type as a pattern is used and a tapered snap flask is also used, and it is carried out that first of all, a drag is formed and reversed and its cope is formed, and their draft is also carried out manually. In this manual work, it is advantageous that skillful arrangement is made according to the experience of an operator, so as to accommodate complex molds. However, there are such disadvantages that in molding the manual operation needs a great effort for reversing both of the cope and the drag simultenously, drafting and also for lifting the flask and the pattern by hands. As a result, such skillful operators, who may use this type of molding machine, have become reduced year by year.
Further, the flask is limitted to such a flask of small type which may be delt with hands, and the actions of jolt type generates metallic sounds and vibrations due to fall and strike of a table to cause sometimes break of the table, and also there may be raised a problem of working environment due to propagation of vibrations from the molding machine to the operator via the floor.
Where such a molding machine having functions of jolt type and squeeze type provides a draft function of stripper (or pattern-draw), the flask may be adapted for a mold of middle size since it is not necessary to hand the flask, and it is seldom to use a snap flask. Therefore, such a molding machine is normally operated in semi-automatic operation and therefore it is advantageous that it may be used for various purposes with respect to any type of pattern.
However, where the molding machine becomes bigger, the jolt sounds and vibrations become greater, and further since its squeeze pressure becomes several tens of tons, it may increase danger of break of parts of the machine. Further, since it is necessary two patterns for the top flask and the bottom flask, it has to use two molding machines, or it needs a changing mechanism for changing the pattern for the cope and the drag alternately. This causes a disadvantage of cost-up for installation.
Contrary to this, the blow squeeze type, which provides a blow mechanism for filling green sand in the place of a flask while transferring the green sand with an air flow, is normally suitable for a small size mold of mass production that is speedy in molding and a number of molding machines are in a type of snap flask. Further, such a molding machine is worked almost automatically except core setting operations and sometimes the molding machine provides an automatic core setting device.
This type of the molding machine has an advantage of rapidly forming a mold, but it provides direction for filling the green sand with an air flow, and as a result, it raises a problem that it may form a shadow according to the shape of a pattern but cannot give a correction to the portion where filling of the green sand is insufficient.
Further, the pattern wears rapidly with sand blast and as a result, the pattern is frequently made of metalic material and its cost becomes high. Furthermore, it increases consumption of parts for blow operation, so that its maintenance cost also goes up, and the price of such a molding machine becomes high inevitably since an oil pressure device is frequently used for its squeeze operation.
In anyone of the jold type or the squeeze type or its improved type, the processes of filling, pressing and forming of the green sand are carried out at the same place and with a series of flow, and therefore there is no way, but a process for a new flask must be started after completion of molding of a flask. This raises a problem that molding productivity does not go up.
SUMMARY OF THE INVENTION
In view of the above-mentioned problems of the prior art, this invention has an object to provide an automatic vibration molding machine which has a high productivity to present a green sand mold of sufficient compression without using an oil pressure device of high cost as pressure means, and to prevent propagation of vibrations to a floor.
To achieve the above object, an automatic vibration molding machine for green sand mold according to the present invention comprises a plurality of vibration proof springs
5
fixed onto a base
4
which is fixed to a floor, a lower frame
3
set and fixed on the vibration proof springs
5
, ascent and descent cylinder means
25
with a lock mechanism fixed to the lower frame
3
, an ascent and descent table
23
setting thereon a flaskb filled with green sand therein and constructed to go up and down between an upward pressing and forming position and a downward predetermined position, an upper frame
1
disposed via an intermediate frame
2
positioned standingly on the lower frame
3
, a vibration head
11
having at least one vibration motor
10
for vibrating a pressure plate
13
via pressure air spring means
12
expansible and contractible in up and down directions, said vibration head being suspended from the upper frame
1
via a head-ascent and descent frame
17
, and ascent and descent means
14
for ascending and descending the vibration head
11
to ascend and descend the pressure plate
13
between an upmost position for separating the pressure plate
13
from the flaskb by contracting the pressure air spring means
12
and a descent position for expanding the pressure air spring means
12
to press the green sand, whereby the green sand of the flaskb may be compressed and formed by the pressure force of expansion of the pressure air spring means
12
and the vibration force of the vibration motor
10
mounted on the vibration
Greigg Ronald E.
Mackey James P.
Taiyo Machinery Co., Ltd.
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