Precoated sand mold for bucket tooth

Abstract

The invention provides a precoated sand mold for a bucket tooth and belongs to the field of production of engineering machines. The precoated sand mold for the bucket tooth comprises an upper mold body, a lower mold body, a mark block, a semi-pouring core, an inner core and an air cylinder. The combined face of the upper mold body and the lower mold body is a pouring parting surface of the bucket tooth. The relative positions of the upper mold body and the lower mold body are fixed through positioning pins. An inner cavity of the upper mold body and an inner cavity of the lower mold body are closed relatively to form a bucket tooth sand shell profile comprising a bucket tooth upper half portion and a bucket tooth lower half portion and a complete bucket tooth sand core profile comprising a sand core upper half portion and a sand core lower half portion. The precoated sand mold for the bucket tooth has the beneficial effects that the production of bucket tooth blanks can be achieved effectively, the materials and labor are saved, the machining amount is reduced, the casting defects are reduced, the yield is increased, and the automatic production is achieved easily.

Description

technical field [0001] The invention belongs to the field of engineering machinery production, in particular to an excavator or loader bucket tooth film-coated sand mold. Background technique [0002] Bucket teeth are important consumable parts on excavators or loaders. Similar to human teeth, they are combined bucket teeth composed of tooth tips and tooth seats, and the two are connected by pins; figure 1 , the root of the tooth tip of the bucket tooth is usually provided with a pin hole, which is connected with the tooth seat on the bucket through the pin shaft; due to the irregular shape of the bucket tooth, most of its manufacturers use metal casting to produce blanks, and then carry out Machining, in order to obtain better stability and processing accuracy; most of the existing bucket tooth blanks are cast with cast iron, the casting method is to first select the appropriate parting surface according to the design drawings of the bucket teeth, and make the shape and sha...

AI Technical Summary

Problems solved by technology

[0002] Bucket teeth are important consumable parts on excavators or loaders. Similar to human teeth, they are combined bucket teeth composed of tooth tips and tooth seats, and the two are connected by pins; figure 1 , the root of the tooth tip of the bucket tooth is usually provided with a pin hole, which is connected with the tooth seat on the bucket through the pin shaft; due to the irregular shape of the bucket tooth, most of its manufacturers use metal casting to produce blanks, and then carry out Machining, in order to obtain better stability and processing accuracy; most of the existing bucket tooth blanks are cast with cast iron, the casting method is to first select the appropriate parting surface according to the design drawings of the bucket teeth, and make the shape and shape of the bucket teeth The same combined model, most of these combined models are bounded by the parting surface as the joint surface of the combined model, most of these models are made of wood or aluminum for handling and processing; second, put the model into the sand box and fill it into the casting Use sand and tamp it down, separate the sand box and take out the model, a cavity with the same shape as the model is formed in the middle of the sand in the sand box, and then make the casting channel and riser to complete the sand mold making before casting; third, After the sand mold is properly dried, the sand box is closed, and the molten metal is poured into the casting channel; fourth, after cooling, the sand box is removed, the sand mold is broken, the casting is taken out, the sprue and riser are taken out, and the Finished the production of the bucket tooth blank; when the molten iron is poured into the sand mold, the molten iron has swelling force on the sand mold, and the sand mold is relatively soft, which will change the shape of the inner cavity of the sand mold, and this change is uncertain, resulting in The shape and size of the cast blank is uncertain; due to the characteristics of the above process, the casting method has a large amount of labor for the workers, high requirements for the skilled operation skills of the workers, a large working area, poor working environment, large dust, and surface material of the casting. Defects such as high roughness value, large amount of reserved processing, waste of raw materials, easy to change, low rate of qualified products, etc.

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