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

A technology of lost foam casting and buckets, which is applied to casting molding equipment, molds, mold components, etc. It can solve the problems of many surface defects, high cost, and difficult control, and achieve high product yield, low production cost, fast cooling effect

Inactive Publication Date: 2015-09-02
TIANJIN WILL LONG SCI &TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 an

Method used

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Examples

Experimental program
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Example Embodiment

[0020] The invention patent relates to a method for lost foam casting of large bucket tooth castings of mining machinery, and the production process is as follows.

[0021] 1. Mold: The mature EPS beads are pre-foamed into the bucket tooth casting mold for filling. After steam heating, cooling, demolding, etc., the mold is taken out of the mold and the cast is cleaned. The release agent on the surface of the mold is placed in the drying room for drying at a temperature of 50°C for 4 hours.

[0022] 2. Paint and drying: Paint the mold in four times, each with a thickness of 0.4-0.6mm, and dry in a drying room at 50°C for 4 hours. The total thickness of the four times is 1.6-2.4mm. The total drying time in the drying room at 50°C is 16 hours.

[0023] 3. Buried box modeling: First, put the mold into a sand box with 1 / 2 molding sand at the bottom. The riser is designed as an exposed riser. After the upper end is placed horizontally, the sand box is filled with molding sand and vibrated...

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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...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22C9/22
Inventor 王军祥岳宏霖高继萍
Owner TIANJIN WILL LONG SCI &TECH CO LTD
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