Lost foam casting method for heavy casting

A technology of lost foam casting and large-scale castings, which is applied to casting molding equipment, molds, cores, etc., can solve problems such as the solidification speed of molten iron cannot keep up, large castings have large space, and castings are deformed. The effect of avoiding casting deformation and low cost

Active Publication Date: 2012-12-19
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AI-Extracted Technical Summary

Problems solved by technology

However, there are still technical problems in the existing large-scale castings of more than 5 tons in lost foam casting: due to the large space and complex structure of large-scale castings, the casting speed ...
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Method used

In the above-mentioned coating component material, quartz powder, potassium feldspar powder, brown corundum, white corundum, bauxite, talcum powder and graphite powder are the aggregate of coating of the present invention, can withstand high temperature, strengthen the intensity of coating, wherein add Potassium feldspar powder, brown corundum and white corundum c...
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The invention discloses a lost foam casting method for a heavy casting. The method comprises the following steps of: a. manufacturing a foam model; b. mounting a counter-deformation bracket: manufacturing the steel-structured counter-deformation bracket according to the size and the length of a workpiece and placing the counter-deformation bracket on the bottom of the foam model; c. painting: the thickness of the paint is not less than 4mm; d. drying: placing the painted foam model in a drying room for drying at the constant temperature of 50 DEG C; e. fixing core: placing the steel-structured bracket in an inner cavity of the foam model so as to fix the model, and putting the whole foam model into a sandbox together; f. boxing: enabling the sandbox containing the foam model to drop sand evenly, vibrating the sandbox during sand dropping, gradually enhancing the vibration amplitude with the increasing of added sand quantity, mounting a main runner and a branch runner of a ceramic tube, and placing a pouring cup; g. pouring: opening a vacuum pump for vacuum pumping before pouring; h. releasing negative pressure: after pouring, keeping the negative pressure for 8 to 15 minutes until solidification of an iron liquid, and then releasing the negative pressure; and i. cleaning.

Application Domain

Foundry mouldsFoundry cores +2

Technology Topic

Stationary modelLost-foam casting +6


  • Experimental program(1)

Example Embodiment

[0015] The present invention will be described in detail below:
[0016] The casting method of the present invention includes the following steps:
[0017] a. Make foam model: make foam model according to design requirements;
[0018] b. Install the anti-deformation bracket: make the steel anti-deformation bracket according to the size and length of the workpiece, and place the anti-deformation bracket at the bottom of the foam model. When the box is packed, the shape of the model facing downward is consistent with the shape of the bracket;
[0019] c. Coating: Coat the finished foam model with coating. The thickness of the coating should not be less than 4mm. The components and weight of the coating are 18 parts of quartz powder, 14 parts of potash feldspar powder, 8 parts of brown corundum, 5 parts of white corundum, 15 parts of bauxite, 20 parts of talc powder, 20 parts of graphite powder, 1.5 parts of latex, 1 part of sodium bentonite, 2 parts of silica sol, 1.5 parts of resin particles, 0.2 parts of aluminum sulfate, methyl cellulose 0.5 part and 50 parts of water, the preparation steps of the coating are (1) first mix and stir the latex, silica sol, resin particles and water in the said proportions to fully dissolve, and let stand for 10 minutes, (2) according to the proportion Add the remaining ingredients, stir while adding, stir for 40 minutes, then it can be used;
[0020] d. Drying; put the coated foam model in the drying room at a constant temperature of 50 degrees and dry it until the paint is dried according to the wall thickness of the workpiece;
[0021] e. Install the core bone: Place the steel support frame in the inner cavity of the foam model to fix the model, and put it in the sandbox together;
[0022] f. Packing: Sand is evenly loaded into the sandbox with the foam model, while the sand is shaken while the sandbox is shaken, the amplitude is gradually increased as the amount of sand added increases, and the ceramic pipe main pouring is installed according to the specific structure of the workpiece and the direction of the molten iron And sprue, and then cover a layer of film on the surface of the sandbox, and place a pouring cup;
[0023] g. Pouring: When pouring, first turn on the vacuum pump to vacuum, the pressure at the beginning of pouring is negative pressure 0.05Mp, when pouring to one-third of the weight of the workpiece, it will gradually increase to negative pressure 0.1Mp within 15 seconds;
[0024] h. Releasing negative pressure: After pouring, hold the negative pressure for 8-15 minutes until the molten iron solidifies and release the negative pressure.
[0025] i. Cleaning: The casting is kept warm for 4-8 hours, then the box is turned over, the parts are poured, sand is thrown, the paint protection layer is removed, and the riser is polished.
[0026] Among the above-mentioned paint component materials, quartz powder, potassium feldspar powder, brown corundum, white corundum, bauxite, talc powder and graphite powder are the aggregates of the coating of the present invention, which can withstand high temperatures and enhance the strength of the coating. Potash feldspar powder is added , Brown corundum and white corundum can improve the high temperature resistance of coatings and enhance the strength of coatings; latex, silica sol and resin particles are binders; sodium bentonite and methyl cellulose are suspending agents; aluminum sulfate is a disintegrant, Adding aluminum sulfate can improve the collapsibility of the coating and ensure the smooth surface of the casting.


Thickness<= 4.0mm

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