Some things to pay attention to when using lost foam casting on a cast iron plat

In the process of dissipative cast iron platform,the pouring process is a very important part of the entire process of dissipative cast iron platform.Controlling the pouring precautions and strictly controlling every detail of the pouring process is the crux of the delivery cast iron platform.

The pouring process of the dissipative die forging cast iron platform is steel liquid filling,while the process of vaporization and dissipation of the foam plastic mold.What should be noted throughout the entire process is:

①The sprue should be filled with molten iron from beginning to end.If it is not satisfied,it is easy to cause sand collapse and air intake due to the strength of the coating layer,which constitutes a disadvantage of the platform/cast iron workbench casting.

②When pouring molten iron,hold it tightly and ensure that the tube is stable,accurate,and fast.Fill the sprue cup in an instant and achieve fast and uninterrupted flow,tons of steel in about a minute.If the steel liquid in the same box of castings is cut off,it will suck in the atmosphere,which may cause the phenomenon of sand collapse or increase the number of pores in the castings,leading to the scrapping of the castings.

③The dissipative die forging adopts a negative pressure closing type and is closed below the sprue cup.When molten iron enters the molding mold,it begins to liquefy and extinguish,and vaporizes and dissipates.The front end of the molten steel forms a temporary cavity at a short distance,so the design of the steel filling rate is almost the same as the dissipation rate of the foam mold.To avoid the low-temperature radiation melting of the molten steel from other molds in the same box,the runner should be kept slightly away from the casting mold.The position of the sprue determines the lower position of the whole box casting.During pouring,pay attention to adjusting and controlling the negative pressure vacuum degree within the range.After pouring,adhere to the negative pressure condition for a period of time.After the negative pressure is over and the steel liquid condenses,it should be discharged from the box.

2.Dissipative die forging of cast iron platform(welding platform)is a type of forging process,in which there are various forging defects,which can lead to the defects of forged parts.Dissipative die forging is no exception.Backspraying is a common phenomenon in dissipative die forging.When backspraying is significant,it can endanger the personal safety of the pouring worker and should be taken seriously.To aggravate the phenomenon of backspraying,the following steps can be taken:

①The density of foam mold should be small.On the premise of ensuring the external quality of foam and the strength of mold,the lighter the foam,the better,to reduce the amount of foam during pouring.

②The foam mold shall be dried before coating.Each batch of foam mold shall be sampled to check the change of drying process weight,and the baking weight change curve shall be made.The coating can be applied as long as the weight no longer changes.

③The pouring system,especially the vertical and horizontal pouring channels,should not be coated.This can allow the gas generated during pouring to be quickly and fully extracted without coating,saving the cost of coating.Finally,cover the bottom of the sprue cup with a baffle to cover the backsprayed molten steel,preventing it from splashing in and endangering the on-site operators.

The application of the above methods can effectively avoid the phenomenon of back spraying during the dissipative die forging process,better avoid the shortcomings of cast iron platform/cast iron flat castings,improve the quality of forged parts,and also improve the safety of delivery.

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