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Flame-retardant insulated riser for magnesium alloy sand casting and preparation method of flame-retardant insulated riser

A sand casting, flame retardant and thermal insulation technology, applied in casting molding equipment, metal processing equipment, casting molds, etc., can solve problems such as prolonging the solidification time of molten metal, achieve significant flame retardant and thermal insulation effects, low cost, and increase feeding effect of ability

Inactive Publication Date: 2016-11-16
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the defects in the prior art, the purpose of the present invention is to provide a flame-retardant insulation riser for magnesium alloy sand casting and its preparation method, which solves the problem that the existing materials for preparing the riser will react with the mold, and prolongs the life of the riser. The solidification time of molten metal in the mouth can be shortened, thereby reducing defects such as shrinkage cavities and shrinkage porosity caused by insufficient feeding in thick parts of castings

Method used

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  • Flame-retardant insulated riser for magnesium alloy sand casting and preparation method of flame-retardant insulated riser
  • Flame-retardant insulated riser for magnesium alloy sand casting and preparation method of flame-retardant insulated riser
  • Flame-retardant insulated riser for magnesium alloy sand casting and preparation method of flame-retardant insulated riser

Examples

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preparation example Construction

[0045] The preparation method of flame-retardant insulation riser for magnesium alloy sand mold casting described in the following examples comprises the steps:

[0046] 1. Weigh each component by mass fraction;

[0047] 2. The quartz sand, floating beads, boric acid, ammonium fluoroborate, and sulfur weighed according to step 1 are placed in an automatic sand mixer for 1min to 2min, and then the p-toluenesulfonic acid curing agent weighed in step 1 is added, and then Mix in the automatic sand mixer for 1min to 2min, then add the coupling agent weighed in step 1 and mix for 1min to 2min, and finally add the furan urea-formaldehyde resin weighed in step 1, and mix in the sand mixer for 2min to 3min , to get the mixed resin sand molding sand.

[0048] 3. The resin sand molding sand mixed in step 2 is compacted in the riser mold, and after 30-50 minutes, the mold is demoulded to obtain a flame-retardant and heat-insulating riser, which is dried at room temperature for 24 hours b...

Embodiment 1

[0050] 85 parts of quartz sand, 5 parts of floating beads, 0.5 parts of flame retardant (including 75 wt% of boric acid, 6.25 wt% of ammonium fluoroborate, and 18.75 wt% of sulfur), 1 part of urea-formaldehyde modified furan resin, and p-toluene sulfonate After mixing 0.3 part of acid and 0.5 part of coupling agent, a flame-retardant heat preservation riser is prepared.

[0051] The tensile strength of the riser prepared in this example was higher than 1.5Mpa after demoulding for 24 hours, and the tensile strength after 72 hours was higher than 1.2Mpa, meeting the requirements for use.

[0052] The molded flame-retardant and heat-insulating riser is dried and applied to a GW103K heat-resistant magnesium alloy casting at a pouring temperature of 750°C. Coloring flaw detection was carried out on the surface of the riser root of the casting after pouring, and no defects such as scale and inclusions were found. After X-ray flaw detection of the casting, no defects such as shrinkag...

Embodiment 2

[0054] 90 parts of quartz sand, 10 parts of floating beads, 3 parts of flame retardant (including 70 wt% of boric acid, 10 wt% of ammonium fluoroborate, and 20 wt% of sulfur), 1.2 parts of urea-formaldehyde modified furan resin, and 0.4 parts of p-toluenesulfonic acid were used in the following proportions. 1 part and 1 part of coupling agent are mixed to make a flame retardant heat preservation riser.

[0055] The tensile strength of the riser prepared in this example was higher than 1.5Mpa after demoulding for 24 hours, and the tensile strength after 72 hours was higher than 1.2Mpa, meeting the requirements for use.

[0056] The molded flame-retardant and heat-insulating riser is dried and applied to WE43 heat-resistant magnesium alloy castings, and the pouring temperature is 730°C. Coloring flaw detection was carried out on the surface of the riser root of the casting after pouring, and no defects such as scale and inclusions were found. After X-ray flaw detection of the ca...

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Abstract

The invention relates to a flame-retardant insulated riser for magnesium alloy sand casting and a preparation method of the flame-retardant insulated riser. The riser is prepared from components in parts by mass as follows: 85-95 parts of casting sand aggregate, 1-15 parts of a thermal insulation material, 0.5-2 parts of a binding agent, 0.2-0.6 parts of a curing agent, 0.5-3 parts of a flame retardant and 0.5-1 part of a coupling agent. According to the prepared riser, the problem that a conventional material for preparing the riser can react with a casting mold is solved, the setting time of molten metal in the riser is prolonged, and accordingly, defects of shrinkage cavities, shrinkage porosity and the like caused by insufficient feeding of a large and thick part of a casting are overcome.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to a flame-retardant and heat-retaining riser for magnesium alloy sand casting and a preparation method thereof. Background technique [0002] In casting production, defects such as shrinkage cavity, shrinkage porosity, and slag inclusion of castings are a major problem restricting casting production, which directly affects the internal quality of castings and process yield. Setting the riser is one of the important measures to ensure the quality of the casting. Setting the riser can ensure the smooth feeding channel, ensure that there is enough molten metal for feeding during the solidification process of the casting, and ensure that the casting can obtain a dense structure after complete solidification, so as to obtain good performance. of castings. [0003] Magnesium alloy is the lightest metal structural material in practical application, and has the characteristics of low den...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66B22C9/08
CPCC04B35/66B22C9/088
Inventor 李艳磊吴国华王迎新陈安涛刘文才
Owner SHANGHAI JIAO TONG UNIV
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