Method for casting large-scale bucket tooth casting by using lost foam

Abstract

The invention discloses a method for casting a large-scale bucket tooth casting by using a lost foam. The method can be used for producing the large-scale bucket tooth with the weight greater than 90Kg. EPS bead granule pre-frothing is used for moulding, and a coating with the thickness of 1.6-2.4mm is applied, and then the casting mould is dried for 16h. A sink head is designed as an open sink head during box burying; modeling sand fully placed after an upper end is horizontal and is compacted through vibration. A blank lost foam pattern is roasted to obtain a model empty-shell after a vacuum pump is turned on; finally molten steel enters the casting from a casting system, and negative pressure stops after lasting for 15 minutes. The obtained casting has the beneficial effects of high surface fineness, high technological yield, and low cost; the method allows industrialization popularization and can bring huge economic benefit.

Description

technical field [0001] The invention belongs to the technical field of foundry machinery, in particular it relates to a method for lost foam casting of large bucket tooth castings of mining machinery. Background technique [0002] Bucket teeth are very important wear-resistant parts of mining machinery buckets. Due to the harsh working environment of mining machinery, bucket teeth have a low service life and are vulnerable parts that need to be replaced frequently. At present, large bucket teeth of mining machinery are mainly produced by casting, and the weight is more than 90Kg. The bucket teeth produced by traditional sand casting have poor surface finish, low density and many surface defects; the investment casting process is complicated and difficult to control , the materials used and consumed are more expensive, suitable for the production of small parts with complex shapes, high precision requirements, or difficult to perform other processing, so the quality of the bu...

AI Technical Summary

Problems solved by technology

[0002] Bucket teeth are very important wear-resistant parts of mining machinery buckets. Due to the harsh working environment of mining machinery, bucket teeth have a low service life and are vulnerable parts that need to be replaced frequently

At present, large bucket teeth of mining machinery are mainly produced by casting, and the weight is more than 90Kg. The bucket teeth produced by traditional sand casting have poor surface finish, low density and many surface defects; the investment casting process is complicated and difficult to control , the materials used and consumed are more expensive, suitable for the production of small parts with complex shapes, high precision requirements, or difficult to perform other processing, so the quality of the bucket teeth produced by investment casting is better, but the weight of the bucket teeth is small, and the process is produced low rate, high cost