Which methods can minimize burns during manual pouring

This is indeed a problem that is easy to occur in the production line, and the probability of occurrence can be reduced by the following aspects:

1, do the four checks before pouring

1) Check the sand type: check whether the box card or bolt is tight; Whether the amount of iron pressing is sufficient and whether the placement position affects the pouring operation; Whether the sprue cup or ring is placed securely, so as to avoid lifting and running fire during pouring.

2) Check the ladle: check whether the ladle is dried and preheated; Whether the lining is complete; Whether the quantity is sufficient, and whether the operating mechanism of the lifting bag is flexible and reliable.

3) Check the insulation materials and appliances: check whether the insulation, slag and ignition materials are ready, and whether the materials and appliances required to prevent fire running are in place. In order to make the tense pouring operation busy and orderly.

4) Check the site: There is no water on the ground of the pouring site, and the pouring channel must be smooth.

2. Control the pouring process

1) dregs

① After the metal liquid is out of the oven, the slag on the liquid surface is removed from the back or side of the nozzle, and the thermal insulation slag-collecting material is covered. Be careful not to damage the coating layer of the bag mouth, so as not to affect the pouring.

② The slag on the liquid surface should be removed again before pouring to avoid slag inclusion caused by pouring into the cast.

2) Pouring

① Master the pouring sequence. When a bag of liquid iron is poured with multiple sand molds, it is generally first poured with thin-walled complex parts and large parts, and then poured with small and medium-sized parts and thick-walled simple parts. The molten iron at the early stage of melting has low temperature and high sulfur content, and generally only casts core bones and unimportant cast iron pieces.

② When pouring, the ladle nozzle should be close to the ladle cup, and the slag bar should be placed on the liquid surface near the ladle to prevent the slag in the ladle from flowing into the ladle cup.

③ Control the pouring speed. At first, it should be poured slowly to prevent spatter and oxidation; Then pour at full speed, keep the cup full, without interruption, so as not to occasionally flow into the pouring cup of slag into the sand mold. When the sand mold is about to be poured full, the pouring speed should be appropriately reduced to reduce the lifting force, prevent lifting, facilitate gas discharge, and avoid a large amount of iron liquid overflow from the riser.

④ When there is a riser, after filling, stop for a moment and then point the riser. After pouring, the top surface of the riser is covered with insulation agent to improve the feeding capacity of the riser

3) Start a fire

After the pouring starts, the gas escaping from the vent hole, riser and core head is ignited immediately to facilitate the rapid discharge of the gas in the cavity and the gas produced in the sand mold.

3, do a good job of safety protection

1) Wear protective gear. Casters should wear labor protection articles in accordance with regulations. Non-pouring personnel are not allowed to approach during pouring.

2) Keep the site dry and smooth. The pouring site should be dry, there should be no flammable and explosive products, and the pouring channel should be smooth.

3) Ladle spreader should be reliable. The ladle should be dried and the operating mechanism should be flexible and reliable. When two people lift ladle pouring, lift and drop the action should be the same. When the bridge crane is pouring, the hook, wire rope or chain shall not have cracks and damage, the liquid iron bag shall not be too full, the liquid level shall be less than 100mm, and the bridge crane must ring the bell when moving, and shall not pass above the site personnel.

4) Tools should be clean and dry. When blocking slag, do not use rusty, wet, unpreheated cooling rod inserted into the iron liquid, so as not to cause metal liquid splash. Do not stand on the front of the nozzle.

5) The pouring table should be secure. When pouring tall castings, the pouring table should be set up firmly and conveniently to ensure safety. Do not look directly at the riser with your eyes during pouring.

6) Disposal of residual iron liquid. After the remaining iron liquid is dumped into the sand pit, do not cover all of it with dry sand, and local liquid level should be exposed as a warning to prevent site personnel from misstepping.