前苏联专利SU1364230A3 Casting mould for obtaining castings

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专利摘要:
This invention relates to the manufacture of castings from cast iron and other metal alloys using a low pressure casting method. The purpose of the invention is to improve the quality of casting by preventing gas inclusions. The casting mold contains a support 1 with a lid, two gasified models 2 made of expanded polystyrene placed in it, a backfill 3 of a quarter of sand without a binder, a peripheral vacuum chamber located between the inner and outer walls of the flask and connected to a vacuum source. Models 2 are installed in a flask with the help of brackets 14, and its feeders 16 are installed in the side surface of a stand made in the form of a shell 18; it forms a cover for the injection mold channel 19, which is fixed to the bottom of the flask by means of a fixing connection. Due to the fact that the casting stand is made in the form of a shell 18, it takes on a lot of sand when forming a gasifier (О СО Ю 11 9 .2, 1 Ч ф and i-tf СО 05 4 СО о см
公开号:SU1364230A3
申请号:SU853854499
申请日:1985-02-13
公开日:1987-12-30
发明作者:Жан Пьер Дени
申请人:Понт-А-Муссон С.А. (Фирма)；
IPC主号:

专利说明:

models, thereby preventing their erosion, as well as the first impacts of the liquid metal supplied under low pressure and directed to the models by a laminar flow. At the same time in the form during the entire operation of the low pressure casting and creating 1
The invention relates to the manufacture of castings from iron and other metal alloys by the method of casting under low pressure.
The purpose of the invention is to improve the quality of the casting by preventing gas inclusions.
Figure 1 shows a schematic representation of the proposed form in the position of pouring it with metal, a section; Fig. 2 shows the form during its manufacture and filling with dry sand without a binder; in Fig. 3 a section A-A in Fig. 2.
The casting mold contains a metal flask 1, gasified models 2 made of expanded polystyrene placed in it, and backfill 3 made of loose refractory material without a binder. The flask contains a peripheral vacuum chamber 4 for creating a vacuum or suction, limited by internal baffles 5 having openings 6 that do not allow dry quartz sand without a binder. Flask has a bottom 7, a cover 8, over which a suction hood 9 is installed. In the cover 8 there are holes 10 that communicate with chamber 4 and openings with filters 11 that allow air and gas to pass through but do not pass silica sand. The cover 8 is rigidly connected with the rod of the power cylinder 12. The suction cap 9 has a channel 13, which communicates the space enclosed between the cap 9 and the cap 8 with a suction system (not shown). Models 2 in the flask are filled with quartz sand, which is compacted and installed in it with the help of brackets 14. They can be made, for example, of a curable mixture of sand and resin.
In the form of rarefaction, a rapid and complete removal of gases occurs as they are formed and the form is filled with a metal with a constant and controlled flow rate. This allows to obtain high-quality castings without gas defects. 6 hp ff, 3 ill.
as one detail, and to have the form of a tubular sleeve, supported by its base on the bottom 7 of the flask 1. Each model has a protrusion 15 having a shape corresponding to the cross section of the feeder 16. The latter are placed in openings 17 of the stand, made in the form of a shell 18 of a curable mixture (sand and thermosetting resin or ceramics
or sand and mineral binder) or from foamed polystyrene. The shell 18 forms, as it were, a lid for the casting channel 19 of the mold, which is hermetically connected to the hole of the casting nozzle 20, having the shape of a truncated cone 21. The shell 18 is a tee that connects the channel 19 with each of the feeders 16, and has a concave arch 22 ,
located above the casting channel 19. On the side surface of the shell 18, holes 17 are made to accommodate model protrusions 15 of models 2.
The sheath is installed and held in mold 1 as follows.
In the bottom 7 of the flask 1, a protrusion 23 is made, on which the centering sleeve 24 s is installed and fixed.
flange 25, made of a curable mixture (sand and thermosetting resin). The inner diameter of the sleeve 24 corresponds to the outer diameter of the shell 18, which, with its lower end, is installed in the centering sleeve 24. In the bottom of the flask there is a round hole 26 (FIG. 3) with radially located rectangular cutouts 27 under the flange 25. Centering
the sleeve 24 has a pair of rectangular legs 28 and a crown 29. The legs 28 are located above the flange 25 and have a shape corresponding to the shape of a rectangular
31
cutouts 27. The tabs 28 are intended for abutment against the upper surface of the protrusion 23 beyond the limits of the rectangular tips 27, together with which form the fastening means. The upper surface of the protrusion 23, the rectangular notches 27, the tabs 28 and a portion of the centering sleeve 24 are covered with a protective cap 30, which rests on one side against the cylindrical part of the centering sleeve 24 and on the other side on the upper surface of the protrusion 23,
Thus, the central bushing 24 fixes a stand which is made in the form of a shell 18 and is inserted from above, abutting against a crown 29 and a protrusion inside the centering sleeve 24. After that, each of the 2 models of foamed polystyrene is inserted separately from above until the protrusion 15 will not enter the opening of the shell 18, Then each of the models 2 is placed on the bracket 14. In this stable equilibrium position, each of the models is centered in the flask 1 and fixed with the help of the centering sleeve 24,
During the filling of the flask 1 with quartz sand, it vibrates, because the vibrators 32 are attached to the plate 31 on which the mount 1 is mounted. After that, the bracket 14 and each of the models 2 are covered with sand without a binder and compacted by vibration, the flask 1 is pressed a plate with a suction hood 9 and under the action of a vacuum, suction of gases from the sand, hardening of the sand and suction of gases occur when the metal is poured through the gate channel 19 into the shell 18, the feeders 15 and each model 2 that are gasified and the bands formed s metal fills.
Due to the fact that the casting station is made in the form of a shell 18 with sufficient strength, it can withstand the weight of sand when forming gasified models, thus preventing their erosion from the first impact of the liquid metal, which is supplied under low pressure and directed to the models by laminar flow. And by creating a reduced pressure for pouring the metal of the mold and the vacuum created in the mold during the entire casting operation, the metal is filled with a constant and controlled flow rate, as well as

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rapid and complete removal of gases as they form, which prevents the formation of gas impurities in the castings and the production of good quality castings.

权利要求:
Claims (7)
[1]
1. A casting mold for casting, containing a flask with a lid, placed in it two gasified models of foamed polystyrene, quartz sand filling without a binder, a peripheral vacuum chamber located between the inner and outer walls of the flask and connected to the vacuum source, o in order to improve the quality of the casting by preventing gas inclusions, the mold is provided with a centering bushing with a fixing flange made of a hardening mixture of quartz sand and uyuschego and riser
in the form of a shell, the sprue channel of which is located concentric to the sleeve, while the upper part of the shell is connected by means of foamed polystyrene feeders to the gasified models, and the lower part to the bottom of the flask by means of fastening means.
[2]
2. Form POP.1, characterized in that a central opening and an annular protrusion with rectangular cuts are made in the bottom of the flask, and a rectangular locking tabs located above the flange and having
0 shape corresponding to the shape of the rectangular notches.
[3]
3. Pop shape 2, characterized in that a notch under the flange of the centering sleeve is made in the protrusion on the bottom of the flask.
[4]
4. Form POP.1, characterized in that the two gasified models of foamed polystyrene are connected to the centering bushing by means of a shell of a cured mixture of sand and a binder, which is connected on one side to each of the gasified models, and on the other sides with centering sleeve for centering and securing the casing on the bottom of the flask.
[5]
5. The form according to claims 1 and 4, characterized in that the centering sleeve is made with a crown, located
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1364230
above its flange, while the lower end of the shell is installed on the crown, and the flange of the sleeve is tightly connected to the metal pipe through a nozzle having the shape of a truncated cone.
[6]
6. The mold according to claim 4, wherein the shell over the central sprue channel has
0
the concave vault, and the central sprue channel at the vault communicates with openings in which foamed polystyrene feeders are located.
[7]
7. Form POP.1, characterized in that the shell is made of expanded polystyrene together with feeders.
Editor Y. Sereda
Compiled by I. Kunitska Tehred L. Serdyukova
Order 6386/58 Circulation 741 Subscription
VNIIPI USSR State Committee on Inventions and Discoveries 113035. Moscow, Zh-35, 4/5 Raushsk nab.
Production
printing company, Uzhgorod, Projecto st., 4
Proofreader V. But ha

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引用文献:

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US3842899A|1971-04-13|1974-10-22|Gruenzweig & Hartmann|Apparatus for carrying out full-form casting process|

BE790852A|1971-12-14|1973-02-15|Akita Kk|MOLDING PROCESS|

JPS4932167A|1972-07-28|1974-03-23|

DE2622552C3|1976-05-20|1979-04-12|Vki-Rheinhold & Mahla Ag, 6800 Mannheim|Mold box for the production of castings|

FR2455491B1|1979-05-02|1983-11-10|Pont A Mousson|GB8414129D0|1984-06-02|1984-07-04|Cosworth Res & Dev Ltd|Casting of metal articles|

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US5009260A|1988-02-26|1991-04-23|Brunswick Corporation|Vacuum lift foam filled casting system|

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US4966220A|1987-09-08|1990-10-30|Brunswick Corporation|Evaporable foam casting system utilizing a hypereutectic aluminum-silicon alloy|

US4754798A|1987-09-15|1988-07-05|Metal Casting Technology, Inc.|Casting metal in a flowable firmly set sand mold cavity|

US4874029A|1988-05-09|1989-10-17|General Motors Corporation|Countergravity casting process and apparatus using destructible patterns suspended in an inherently unstable mass of particulate mold material|

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US6189598B1|1998-10-05|2001-02-20|General Motors Corporation|Lost foam casting without fold defects|

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法律状态:

优先权:

申请号 | 申请日 | 专利标题

FR8402907A|FR2559407B1|1984-02-15|1984-02-15|FOUNDRY MOLDING PROCESS AND MOLD FOR PRECISION CASTING UNDER LOW PRESSURE, WITH GASIFIABLE MODEL AND SAND MOLD WITHOUT BINDER|

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