Lost foam technology combined with 6 casting methods

The lost foam casting technology is to use foam plastic to make a solid mold with the same structure and size as the part. It is dipped and coated with a refractory adhesive coating, dried, and then molded with dry sand, vibrated and compacted, and then poured into molten metal to make the shape suffer. The hot gasification disappears, and the casting method of metal parts consistent with the shape of the pattern is obtained. Sanzhuji combines the investment sand casting production process to summarize the following casting techniques, and the combined use can improve the quality of the castings.

There are mainly the following types of lost foam casting technologies:
Pressure lost foam casting technology:
The pressure lost foam casting technology is a new casting technology that combines the lost foam casting technology and the pressure solidification crystallization technology. It is in the pressure pouring with the sand box. After the molten metal is poured to make the foam disappear, the pressure pouring is quickly sealed, and A casting method in which a certain pressure of gas is introduced to solidify and crystallize the molten metal under pressure. The characteristic of this casting technology is that it can significantly reduce the casting defects such as shrinkage cavity, shrinkage porosity, and porosity in the casting, increase the density of the casting, and improve the mechanical properties of the casting.

Vacuum low pressure lost foam casting technology:
Vacuum low pressure lost foam casting technology is a new casting technology developed by combining negative pressure lost foam casting method and low pressure anti-gravity casting method. The characteristics of vacuum low-pressure lost foam casting technology are: it combines the technical advantages of low-pressure casting and vacuum lost foam casting, completes the filling process under controllable air pressure, and greatly improves the casting filling ability of the alloy; compared with die casting, the equipment The investment is small, the cost of castings is low, and the castings can be strengthened by heat treatment. Compared with sand casting, castings have high precision, low surface roughness, high productivity, and good performance; under the action of anti-gravity, the direct gate becomes a shortened channel and the pouring temperature The liquid alloy undergoes feeding and solidification under controllable pressure. The casting system of alloy castings is simple and effective, the yield is high, and the structure is compact; the casting temperature of vacuum low pressure lost foam casting is low, and it is suitable for a variety of non-ferrous alloys.

Vibration lost foam casting technology:
The vibration lost foam casting technology applies a certain frequency and amplitude of vibration during the lost foam casting process to solidify the casting under the action of the vibration field. Because the metal solution is vibrated for a certain period of time during the solidification process of the lost foam casting, the vibration force makes the liquid Relative movement occurs between the phase and the solid phase, which breaks the dendrites and increases the crystalline core in the liquid phase, so that the final solidification structure of the casting is refined, the feeding is improved, and the mechanical properties are improved. This technology uses the ready-made compact vibrating table in the lost foam casting, through the mechanical vibration generated by the vibrating motor, makes the molten metal nucleate under the dynamic excitation, and achieves the purpose of refining the structure. It is a simple operation, low cost, and environment-free Methods of contamination.

Semi-solid lost foam casting technology:
Semi-solid lost foam casting technology is a new casting technology that combines lost foam casting technology and semi-solid technology. Because the feature of this process is to control the relative proportion of liquid-solid phase, it is also called transformation-controlled semi-solid forming. This technology can increase the density of castings, reduce segregation, improve dimensional accuracy and casting performance.

Lost foam shell casting technology:
Lost foam shell casting technology is a new type of casting method that combines investment casting technology and lost foam casting. The method is to coat several layers of refractory material on the surface of a foamed plastic pattern made with a foaming mold that has the same shape as the part. After it is hardened and dried, the foamed plastic pattern is burned and gasified to disappear to form a shell, which is baked. , and then pouring to obtain a new type of precision casting method for castings with higher dimensional accuracy. It has the characteristics of large pattern size and high precision in lost foam casting, as well as the advantages of encrustation precision and strength in investment precision casting. Compared with ordinary investment casting, it is characterized by low cost of foam plastic mold material, convenient pattern bonding and combination, easy gasification and disappearance, which overcomes the problem of investment deformation caused by easy softening of investment casting mold material, and can produce more Large-size complex castings of various alloys.

Lost Foam Suspension Casting Technology:
Lost foam casting technology is a new type of practical casting technology that combines lost foam casting technology and suspension casting. The technological process is that after the molten metal is poured into the mold, the foamed plastic shape is vaporized and mixed in the suspending agent of the riser model (or the suspending agent is placed in a specific position of the pattern, or the suspending agent is combined with EPS to make a foam pattern. ) Physical and chemical reaction with molten metal to improve the overall (or part) structure and performance of the casting.

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