Lost Foam Casting (EPC method) production line

Introduction
1, EPC-the full name is the actual dry sand negative pressure casting, or Fv method,EPC is the casting method basing on model polystyrene foam box filled with sand placed in a vacuum dry sand, in the negative pressure under the conditions of casting, foam mold Gasification of liquid metal occupy a kind of model space. As with the sand casting has unparalleled advantages, in recent years made rapid development in China.
2, lost foam casting characteristics: (1) simplify procedures and shorten the production cycle, improving production efficiency. (2) reduce labor intensity and improve the working environment. (3) increase casting dimensional accuracy and surface finish up to 3.2-12.5um, machining allowance, a maximum of 1.5-2mm. (4) increased design freedom of parts, sand can not be cast out of holes and slots, etc. can be easily cast out (5) Yield of casting process is high ,rejection rate is low. (6) process technology is easy to master, production management is convenient, less need for skilled workers. (7), less investment and quick returns.

the main EPC equipment (such as photos)
1, the vacuum system equipment
2, machine tooling or manual molding equipment
3, coating preparation, coating and drying equipment, hanging
4, Tap Equipment
5, processing (off the sand, transmission, cooling, screening) equipment

Use and maintenance
1, in accordance with the components provided by the data, please refer to the parts manual.
2, separate debuging the components has been completed, even the car is running.
3, formal work process is as follows: (working before the valve is turned off)
(1), to the circulation water tank filled with water, connected to mains water ring vacuum pump required way.
(2), to the Grit Chamber pop-injection to the water level.
(3), open water ring vacuum pump inlet valve to start the vacuum pump, open the control gate valve on the buffer tank pumping, this time vacuum gauge should have the corresponding instructions.
(4), connected sand box interface to the sand box for the exhaust, the vacuum level in the beginning when the casting process requirements.
(5), pouring time of completion and meet the process requirements when the pump shut down, the program is as follows: first, close the control gate valve and vacuum pump inlet valve, and then stop vacuum pump.
4, shut down the system
(1) Close controlling gate valve and inlet valve, stopping vacuum pump. To a vacuum system to atmospheric pressure inflated to open the valve sewage sewage, put sand, after the closure of the valve.
(2) vacuum pump drainage.
(3) removal of the surface of the various components of dust.
Note: In order to improve the service life of vacuum pump, can be repeated several times a day 4 (1) process.

process
1, machine-made or man-made molding.
2, bonding models, pouring riser.
3, dip brush coating and drying.
4, the model placed in sand box, fill in the dry sand, and tap, covered with plastic film, press release gate Cup.
5, the vacuum sand box, to process requests started pouring.
6, casting finished, continue to vacuum until the sand box time after the pump shut down process requirements.
7, when casting cooling, turn box off the sand, dry sand, casting separation.

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