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Sand casting mold and method for preparing bucket tooth tip by using sand casting mold

A technology of sand casting and moulds, which is applied in the field of sand casting molds and the preparation of bucket tooth tips by using the sand casting molds, which can solve the problems of reduced fluidity of molten iron, increased rejection rate of castings, and difficulty in obtaining densification, etc., to reduce thermal expansion Shrinkage rate, fluidity improvement, and porosity reduction effect

Inactive Publication Date: 2018-12-21
NINGBO JIADA PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the strength of alloy steel, it is necessary to have higher carbon content in alloy steel. However, higher carbon content and alloy content will reduce the fluidity of molten iron during casting, and castings are prone to shrinkage defects, which are difficult to obtain. Products with high density, complete shape and good mechanical properties
In actual production, in order to improve the fluidity of molten iron, the method of increasing the temperature is often used. However, when pouring at an excessively high temperature, the sand mold will swell, the casting rejection rate will increase significantly, and the manufacturing cost will also increase.

Method used

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  • Sand casting mold and method for preparing bucket tooth tip by using sand casting mold
  • Sand casting mold and method for preparing bucket tooth tip by using sand casting mold
  • Sand casting mold and method for preparing bucket tooth tip by using sand casting mold

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Experimental program
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Effect test

Embodiment 1

[0027] The sand casting mold in the present embodiment is made from the raw material of following parts by weight:

[0028]

[0029] The preparation method of described modified quartz sand is, Al(NO 3 ) 3 Dissolved in water to make 2.6% Al(NO 3 ) 3 solution, soak the quartz sand in Al(NO 3 ) 3 Add NaOH solution to the solution to adjust the pH value to 7.7, stir evenly and let it stand for 30 minutes, then filter, heat the obtained quartz sand to 950°C at a heating rate of 16°C / min for high-temperature calcination, and keep it for 1.5h to obtain a surface Coated with a layer of nano-Al 2 o 3 of quartz sand, nano-Al 2 o 3 The particle size distribution is 30nm-40nm, that is, modified quartz sand.

Embodiment 2

[0031] The sand casting mold in the present embodiment is made from the raw material of following parts by weight:

[0032]

[0033] The preparation method of described modified quartz sand is, Al(NO 3 ) 3 Dissolved in water to make 1.5% Al(NO 3 ) 3 solution, soak the quartz sand in Al(NO 3 ) 3 Add NaOH solution to the solution to adjust the pH value to 7.5, stir evenly, let it stand for 30 minutes, and then filter, heat the obtained quartz sand to 900°C at a heating rate of 13°C / min for high-temperature calcination, and keep it for 2h to obtain a surface coating Coated with a layer of nano-Al 2 o 3 of quartz sand, nano-Al 2 o 3 The particle size distribution is 20nm-30nm, that is, modified quartz sand.

Embodiment 3

[0035] The sand casting mold in the present embodiment is made from the raw material of following parts by weight:

[0036]

[0037] The preparation method of described modified quartz sand is, Al(NO 3 ) 3 Dissolved in water to make 3.8% Al(NO 3 ) 3 solution, soak the quartz sand in Al(NO 3 ) 3Add NaOH solution to the solution to adjust the pH value to 8.0, stir evenly, let it stand for 30 minutes, and then filter, heat the obtained quartz sand to 1000°C at a heating rate of 20°C / min for high-temperature calcination, and keep it for 1h to obtain surface coatings. Coated with a layer of nano-Al 2 o 3 of quartz sand, nano-Al 2 o 3 The particle size distribution is 40nm-50nm, that is, modified quartz sand.

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Abstract

The invention relates to a sand casting mold and a method for preparing a bucket tooth tip by using the sand casting mold, belonging to the technical field of machinery. The sand casting mold is prepared from the following raw materials in parts by weight: 100 parts of modified quartz sand, 12-30 parts of wollastonite, 4-6 parts of calcium bentonite, 1-4 parts of pulverized coal, and 6-9 parts ofwater. The sand casting mold has the advantages of good air permeability and good performance, and can provide molten metal with good flowability and reduce surface defects of castings, and the buckettooth tip by using the casting mold can effectively improve the mechanical properties thereof.

Description

technical field [0001] The invention belongs to the technical field of machinery, and relates to a sand casting mold and a method for preparing bucket tooth tips by using the sand casting mold. Background technique [0002] Excavator bucket teeth are important consumable parts on excavators. Similar to human teeth, they are combined bucket teeth composed of tooth seats and tooth tips, and the two are connected by pins. Excavator bucket teeth are in direct contact with rock, soil, ore, etc. during mining, geological exploration, and infrastructure construction. The most wearable part of the excavator, each excavator consumes a large amount of bucket tooth accessories every year. In particular, the tip of the bucket tooth is the first part to bear the brunt of rock, soil, ore, etc. Most of the wear during excavation is concentrated on the bucket tooth, which requires the tip of the tooth to have excellent mechanical properties. [0003] In the prior art, the tooth tip is gen...

Claims

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Application Information

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IPC IPC(8): B22C1/00B22C1/08
CPCB22C1/00B22C1/08
Inventor 钱嘉镕新
Owner NINGBO JIADA PRECISION CASTING
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