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Exothermic heat-preservation feeder for casting and preparation method of feeder

A thermal insulation riser and particle size technology, which is applied to casting molding equipment, casting molds, and casting mold components, can solve problems such as insufficient heat generation and poor thermal insulation, and achieve the effects of increased feeding rate, reduced cost, and wide sources

Active Publication Date: 2014-02-05
欧区爱铸造材料(中国)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a heat-insulating riser for casting and its preparation method, which solves the problems of poor heat preservation and insufficient heat generation in the existing riser; prolongs the solidification time of molten metal in the riser, thereby reducing shrinkage cavity and porosity of castings Wait for casting defects to improve yield

Method used

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Experimental program
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Effect test

specific Embodiment approach 1

[0021] Specific implementation mode one: the preparation method of the heat preservation riser for casting in this implementation mode is prepared according to the following steps:

[0022] Step 1: Weigh 25 parts of expanded vermiculite, 20 parts of magnesia powder, 10 parts of quartz sand, 10 parts of aluminum powder, 10 parts of graphite powder, 5 parts of magnesium powder, 5 parts of iron oxide powder, 2 parts of sodium nitrate, 3 parts of fluorite powder, 6 parts of water glass, 3 parts of red mud and 1 part of lignin;

[0023] The particle size of the expanded vermiculite is 16 / 30 mesh; the particle size of quartz sand is 70 / 100 mesh, and the mass content of silicon dioxide is greater than 95%; the particle size of magnesia powder is 100 mesh; the particle size of aluminum powder is 70 mesh, and the mass purity is greater than 99%; the particle size of graphite powder is 100 mesh, and the purity is 60%; the mass purity of iron oxide powder is greater than 99%; the modulus...

specific Embodiment approach 2

[0027] Specific embodiment two: the preparation method of the heat preservation riser for casting in this embodiment is prepared according to the following steps:

[0028] Step 1: Weigh 15 parts of expanded vermiculite, 10 parts of magnesia powder, 20 parts of quartz sand, 15 parts of aluminum powder, 5 parts of graphite powder, 3 parts of magnesium powder, 13 parts of iron oxide powder, 4 parts of sodium nitrate, 2 parts of fluorite powder, 7 parts of water glass, 4 parts of red mud and 2 parts of lignin;

[0029] The particle size of the expanded vermiculite described therein is 20 / 40 mesh; the particle size of quartz sand is 100 / 140 mesh, and the mass content of silica is greater than 95%; the particle size of magnesia powder is 100 mesh; the particle size of aluminum powder is 100 mesh, the quality purity More than 99%; the particle size of graphite powder is 100 mesh, the purity is 60%; the mass purity of iron oxide powder is more than 99%; the modulus of water glass is 2...

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Abstract

The invention relates to an exothermic heat-preservation feeder for casting and a preparation method of the feeder, belongs to the casting field, and solves the problems that an existing feeder has a poor heat insulating effect and insufficient heat, so as to shorten the solidification time of molten metal in the feeder, reduce casting defects such as casting shrinkage cavities and shrinkage porosity and promote the product yield. The feeder is prepared from expanded vermiculite, magnesite powder, quartz sand, aluminite powder, graphite powder, magnesium powder, ferric oxide powder, sodium nitrate, fluorite powder, sodium silicate, red mud and lignin. The preparation method comprises the following steps of weighing; placing the expanded vermiculite, the magnesite powder, 40% of sodium nitrate, 40% of red mud and 40% of lignin into a runner wheel sand mixer and mixing, then adding the quartz sand, the aluminite powder, the graphite powder, the magnesium powder, the ferric oxide powder, sodium nitrate and fluorite powder, mixing, adding the remained red mud, the lignin and the sodium silicate and mixing; and filling into a mold and compacting, dehydrating and demoulding after hardening. The feeder is used for casting.

Description

technical field [0001] The invention belongs to the field of casting, and in particular relates to a heating and heat preservation riser for casting and a preparation method thereof. Background technique [0002] In the production of foundry sand molds, the main functions of the riser are feeding, venting and slag removal. When the performance of the riser is not good, it often causes casting defects such as shrinkage cavity, shrinkage porosity, slag inclusion, etc., and the casting is scrapped. Therefore, sand mold risers, thermal insulation risers, heating risers or heating insulation risers of traditional technology are widely used, but with the continuous improvement of the quality requirements of castings, it is difficult to meet them due to their shortcomings such as poor insulation effect and insufficient heat generation. Due to the high requirements of feeding, slag removal and exhaust, the yield of castings is generally low. In addition, the traditional process ...

Claims

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Application Information

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IPC IPC(8): B22C9/08B22C1/02
Inventor 石德全高桂丽
Owner 欧区爱铸造材料(中国)有限公司
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