High-performance precision casting should create conditions that use
technologically advanced modeling and core making methods. The productivity of
the old-fashioned shock-type or shock-pressure molding machine production line
is not high enough. The labor intensity of the workers is large, the noise is
large, and it is not suitable for the requirements of mass production. It should
be gradually modified. For small precision castings, it is possible to use a
horizontal or vertical type of boxless high-pressure molding machine production
line, real modeling and high production efficiency, and a small footprint; for
the middle parts, various high-pressure molding machine production lines with
boxes can be selected. The air-punching molding line is suitable for the
requirements of fast and high-precision modeling production lines. The
core-making method can be used: high-efficiency core making methods such as cold
core box, hot core box and shell core.
What are the 5 advantages of using precision castings?
1. Precision casting parts forging precision, high finish, and can cast
2. Can forge various alloys (shell is advanced refractory)
3. Single piece, small batch, large batch production
4. Less, no cutting (Ra3.2~1.6um) slightly grinding
5. The precision casting material is expensive, the process is complicated,
and the production cycle is long.
How to carry out the shell mold burning work of precision casting parts
When the shell mold is formally sintered for precision casting, the shell of
the wax shell is removed from the shell mold to the side of the sintering
furnace, and the shell mold is taken out to check whether there is any break or
crack, and the cup is cleaned. Next, place it neatly on the shell mold cart.
Start the main power of the sintering furnace, open the furnace door, and clean
the furnace with a broom and air gun. Use the shell mold fork to carefully fork
the shell mold and slowly put it into the furnace. Note that during the
insertion process, the shell mold should not be touched to the bottom of the
furnace or the furnace wall to prevent it from breaking. Set the sintering
temperature according to the product type and technical requirements, generally
1000~1200 °C. Start the sintering oil pump, the oil pressure is about
105~2.0kg/m2. Use the torch to ignite in the combustion nozzle. After the
ignition is successful, the flame is burned stably and the furnace is preheated.
When the first furnace is heated to 600 °C or above, the shell is heated, the
furnace door is closed, and the oil quantity and wind pressure are adjusted
again to make it completely combustible.