Equipment for expendable pattern casting

Abstract

The invention discloses equipment for expendable pattern casting and relates to the technical field of precision casting. The key points of the technical scheme lie in that the equipment comprises a swing table, a sand box and a vacuum pump. An air exhaust rod is disposed in the sand box and connected with an air pipe; the air pipe communicates with the air exhaust end of the vacuum pump; a filterand a vacuum meter are disposed between the air pipe and the vacuum pump; the lower end of the air exhaust rod is fixed to the inner bottom wall of the sand box; the upper end of the air exhaust rodfaces upwards and is provided with an air entering hole; the upper end of the air exhaust rod is used for being inserted into a groove of the bottom wall of a workpiece; and an air channel which makesthe air entering hole communicate with the air pipe is disposed in the air exhaust rod. By means of the equipment for expendable pattern casting, the groove of the bottom wall of the workpiece can befull of molding sand, and after expendable pattern casting, the from and position accuracy of the portion, at the groove, of the workpiece is high; by arranging a copper pipe and a vibrator, the effect that the groove of the bottom wall of the workpiece is full of the molding sand can be further guaranteed, and the product quality is improved; and the air exhaust rod can be fixed to any positionin the sand box, the length of the air exhaust rod can be conveniently changed, and the applicability to workpieces is high.

Description

technical field [0001] The invention relates to the technical field of precision casting, in particular to equipment for lost foam casting. Background technique [0002] Precision casting refers to the general term for the process of obtaining precise size castings. Compared with the traditional sand casting process, the size of the castings obtained by precision casting is more accurate and the surface finish is better. Precision casting includes: investment casting, ceramic casting, metal casting, pressure casting, lost foam casting, etc. Lost foam casting is especially suitable for the production of large-volume machine tool base products. [0003] The existing Chinese invention patent application with the publication number of CN104741532A discloses a lost foam casting process, which includes the following steps: selection of foam plastic beads→model making→model combination into clusters→model coating→vibration modeling→pouring replacement→ Cool to clean. [0004] The...

AI Technical Summary

Problems solved by technology

[0005] The prior art solutions mentioned above have the following defects: the bottom wall of some workpiece products is provided with grooves, and when the sand box is filled with sand before casting, even if there is a vibration process, the air in the groove of the workpiece cannot be discharged, and the sand particles are difficult to Fill the groove completely, which will lead to the problem of poor shape and position accuracy when the workpiece is located in the groove after lost foam casting

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