Full mold casting method for large grinder bed

Abstract

The invention discloses a full mold casting method for a large grinder bed. The large grinder bed is machined by the steps of lost foam pattern manufacturing, lost foam pattern coating, lost foam pattern drying, casting bed manufacturing, design of a pouring system, smelting and pouring, casting taking-out and the like. An annular pouring gate is used in the pouring system which is an open type non-pressure gating system, four sprues are used, two of the four sprues are positioned at two ends of a lost foam pattern and are connected with a pouring cup at the upper end, the other two sprues stretch across the middle of the lost foam pattern and are connected with the bottom of a pouring cup at the upper end, a cross gate surrounds the periphery of the lost foam pattern, the upper part of the outer wall of the cross gate communicates with the sprues, a plurality of ingates are arranged below the cross gate at intervals, and the lower ends of the ingates are bent inwards and go deep intothe bottom of the lost foam pattern. The multi-pouring-gate open type gating system is used, and it can be ensured that slag blowholes are not formed in a casting guide track; a riser-free and exposed-air-hole-free process is adopted, sufficient gasification of the lost foam pattern is ensured, carbon deposition is avoided, the appearance is attractive, and smoke does not exist; and by a special coating brushing method, it can be ensured that sand does not adhere to castings.

Description

Technical field: [0001] The invention relates to the field of casting processing, in particular to a full-type casting method for a large grinding machine bed. Background technique: [0002] Due to the large size of the large grinding machine bed, the weight is between 10-30 tons and the length is between 10-20 meters. It cannot be mass-produced, but can only be produced in one piece. It is suitable for the lost foam solid mold casting process. Due to the heavy weight and long length, it is very difficult to cast even with wooden molds. It is even more difficult to produce qualified castings that meet the quality requirements by using the solid mold casting process. [0003] Full mold casting is to use polystyrene foamed plastic to replace the ordinary shape. After the mold is made, the molten metal is directly poured without taking out the pattern. The space position occupied, the casting method to obtain the required casting after cooling and solidification. Lost foam so...

AI Technical Summary

Problems solved by technology

Lost foam solid mold casting has its advantages, but its disadvantages are also prominent. For example, the surface area of ​​castings is serious, and the guide rail is thick and easy to produce slag holes and pores formed by polystyrene; the shape is easily deformed due to the strength of the model; the pouring temperature is high, and the inner cavity Easy to stick sand, etc.

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