This control procedure is applicable to the routine pouring of the company and is used as the guidance document for the pouring personnel in front of the furnace.
1.Preparation before pouring
1.1 before pouring, the pouring commander shall first understand the material, weight of molten steel, quantity, weight of castings to be poured, layout of sand mold, pouring process specification and other basic information.
1.2 the sprue cups of the box molding parts shall be arranged in a straight line as far as possible, and the same materials shall be gathered together.
1.3 prepare grass ash, heating agent, dry sand, air entraining material, shovel, water pipe appliance.
1.4 check whether there is sand under the riser, whether the pressing iron is backed well, and whether the gate flow meets the requirements.
1.5 check the pouring crown block, ladle, etc.
2.1 make the thermocouple or optical pyrometer measure the temperature of molten steel before pouring, and the temperature of molten steel should be between 154 ℃ – 1620 ℃.
2.2 determine the size of the cladding hole according to the large castings poured in the same furnace. When pouring small parts with big holes, the plug rod should be controlled to reduce the flow rate and ensure the pouring quality.
2.3 only one person is allowed to direct the pouring, and the tundish shall be in the center of the sprue cup. The distance between the ladle hole and the sprue cup is about 300 mm. The slag and dirt under the ladle hole shall not fall into the ungrouting sand mold.
2.4 feed slowly at the beginning of pouring, and then pour at full speed. When the molten steel is close to the parting surface, the metal flow shall be reduced. After pouring to the specified height of the riser, close the plug rod, then note 2-3 times, and note 2-3 times for the dark riser.
2.5 the open riser steel shall be poured to the pouring height specified in the process, and the steel flowing to the surface of the sand box shall be immediately pried loose.
2.6 bleed air immediately at the beginning of pouring.
2.7 when the open riser enters the molten steel, the hard shell shall be removed in time, and the straw ash or heat preservation agent shall be placed when pouring to the specified height.
2.8 in case of gunfire during pouring, stop pouring immediately and continue pouring after blocking.
2.9 each furnace must be poured out for the same furnace test, and the test bar (block) shall be poured in several sand molds at the same time.
2.10 after pouring, the time for removing the load of the pressing iron shall be determined according to the casting size, wall thickness and process regulations.
2.11 according to the process specification and the specific conditions of the casting (such as the lack of molten steel, etc.), take the measures of pouring the riser, vibrating the riser and adding oxygen to the riser.
2.12 after each ladle of molten steel is poured, the pouring personnel shall record the pouring products and fill in the pouring record.
3.Pouring safety measures
3.1 the channel in the pouring area shall be unobstructed, and the ground in the pouring area shall be free of ponding.
3.2 the pouring position shall ensure the safety and convenience of workers, and the large parts with difficult pouring conditions shall be provided with a safe operation platform.
3.3 the oxygen cylinder around the pouring area shall be covered and the inflammable and explosive materials shall be removed.
3.4 personnel participating in pouring shall wear labor protection articles, and non pouring personnel shall leave the pouring area.