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  • Lost foam casting technology concept and manufacturing technology advantages

    Lost foam casting technology concept and manufacturing technology advantages

    As a new high-precision casting method, lost foam casting has the advantages of high precision, flexible design, high work efficiency, and environmental protection compared with other casting technologies. The castings obtained by the lost foam casting technology have a lower surface roughness th...
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  • Slag imperfection of lost foam casting

    Slag imperfection of lost foam casting

    Slag inclusion defect refers to the defect caused by dry sand, paint and other inclusions accompanied by molten iron entering the casting during pouring.On the surface layer of the machined casting, white or black-gray inclusion spots can be seen, which are distributed singly or in pieces. White ...
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  • Causes of porosity in lost foam casting

    1.The specific location of the sprue is not standardized, and a dead corner area is generated during filling. Because of the effect of gas pressure in the cavity, vaporization residues accumulate in the blind spot to produce pores. The cross-sectional area of ​​the sprue is too large, which makes...
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  • Causes of porosity in lost foam casting

    1.The foam model vaporizes and decomposes to produce a large amount of vapor and residues that cannot be discharged in time, and the foam and coating layer are filled with dry sand. Under the high temperature of the liquid alloy, a large amount of cracked The intrusion of hydrogen and oxygen into...
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  • Reasons and solutions for cracks in aluminum die casting

    Visual inspection: Put the casting in alkaline solution, the cracks are dark gray. The destruction and cracking of the metal matrix are straight or wavy, with narrow and long lines, which have a tendency to develop under the action of external forces. Causes of cracks in aluminum alloy castings: ...
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  • Causes and solutions of aluminum die casting erosion

    Visual inspection: There are pitting or embossing in the local position of the die casting. The reasons are as follows: 1) Improper setting of the inner runner position 2) Poor cooling conditions The solutions and prevention methods are: 1) The thickness of the inner runner should be appropriate ...
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  • Causes and solutions of friction ablation in aluminum die casting

    Visual inspection: The surface of the die-casting part has rough surfaces in some positions. The reasons are as follows: 1.Improper position, direction and shape of the inner runner caused by the die-casting mold (mold) 2.Insufficient cooling of molten metal scouring the vertical part at the inne...
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  • Causes and solutions of delamination (pinching and peeling) of aluminum die-casting

    Visual inspection or damage inspection: There are obvious layers of metal in the casting part. The reasons are as follows: 1) Insufficient mold rigidity. In the process of molten metal filling, the template produces length 2) The punch appears to crawl during the injection process 3) Improper des...
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  • Causes and solutions of carbide traces produced by aluminum die casting

    Appearance inspection: small flakes and metal or non-metallic and metal base parts are welded, and small flakes are peeled off under the action of external force. Some of the peeled casting surfaces are shiny, and some are dark gray. The reasons are as follows: 1) There are metallic or non-metall...
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  • Causes and solutions of aluminum die-casting marks

    Visual inspection: the traces left by the contact between the surface of the casting and the surface of the die-casting cavity or the step marks appear on the surface of the casting. The reasons are as follows: 1. Caused by ejector components 1) The end face of the ejector rod is worn 2) The adju...
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  • Causes and solutions of shrinkage (dents) in aluminum die casting

    Visual inspection: There are smooth dents (like discs) on the most thick surface of the die casting. The reasons are as follows: 1) Caused by shrinkage ·Improper design of die castings with too large wall thickness difference ·Improper sprue location ·Low injection pressure and short holding time...
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  • Causes and solutions of cold partition in aluminum die casting

    Appearance inspection: The surface of the die-casting has obvious, irregular, sunken linear lines (both penetrating and non-penetrating), the shape is small and narrow, sometimes the junction edge is smooth, which may be possible under the action of external force. The reasons are as follows: 1) ...
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