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
东莞市巨高机床有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI 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

Method used

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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 par...

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Abstract

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.

Description

technical field [0001] The invention relates to a casting method, in particular to a lost foam casting method for large castings. Background technique [0002] Casting large castings places high demands on the model. Using different models, casting methods are also different. The traditional method is to use ground mold sand casting, that is, to make the outer mold of the model first, then dry, place the sand core, close the box, pour, clean and polish. Using this traditional method, although large-scale castings can be cast, it is labor-intensive, time-consuming and labor-intensive, and the quality of the castings is unstable: the smoothness does not meet the requirements, the shape is easily deformed, and it is often overweight, which consumes a lot of energy and costs. high. Later, people tried to use the lost foam casting method. Lost foam casting is a relatively advanced casting method, which has the advantages of saving time and effort, smooth surface and stable ca...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22C3/00B22D18/06
Inventor 李运生廖巨清彭传跃
Owner 东莞市巨高机床有限公司
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