A centrifugal pouring method for water glass investment casting

A technology of investment casting and centrifugal casting, which is applied in the field of casting and casting, can solve the problems of shrinkage cavities, shrinkage porosity, and unqualified castings, and achieve the effects of accelerating filling, reducing static pressure and preventing volume expansion.

Inactive Publication Date: 2011-12-14
临清市中远精铸有限责任公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a centrifugal pouring method for investment casting of water glass, which solves the problem that castings are prone to shrinkage cavities, shrinkage porosity, or the volume of the mold shell increases to cause unqualified castings during pouring of water glass investment casting.

Method used

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  • A centrifugal pouring method for water glass investment casting
  • A centrifugal pouring method for water glass investment casting
  • A centrifugal pouring method for water glass investment casting

Examples

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Effect test

Embodiment 1

[0011] Embodiment one: if figure 2 As shown, the effective length of the static pressure generated on the sprue 6 is 0.6 times of the effective length of the static pressure of the original sprue 7, reducing the static pressure head and reducing the pressure on the water glass shell 1. Put the water glass shell 1 into the iron box 2, embed the steel sand 3 to reinforce the water glass shell 1, prevent the water glass shell 1 from expanding, pour the molten iron 5 through the sprue 6, and after standing for 30 seconds, the centrifugal rotary table 4 Rotate at a rate of 80 rpm for 10 minutes to obtain a casting, and there is no "shrinkage cavity" or "shrinkage porosity" casting defect at the anatomical hot joint of the casting.

Embodiment 2

[0012] Embodiment two: if image 3 As shown, the diameter of the sprue 6 is 0.8 times the diameter of the original sprue 7, which reduces the static pressure head and reduces the pressure for the water glass shell 1. Put the water glass shell 1 into the iron box 2, embed the steel sand 3 to reinforce the water glass shell 1, prevent the water glass shell 1 from expanding, pour the molten iron 5 through the sprue 6, and after standing for 30 seconds, the centrifugal rotary table 4 Rotate at a rate of 100 rpm for 15 minutes to obtain a casting, and there is no "shrinkage cavity" or "shrinkage porosity" casting defect at the anatomical hot joint of the casting.

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Abstract

The invention discloses a centrifugal pouring method for water glass investment casting, relates to a casting pouring method, and solves the problem that castings are prone to unqualified castings during pouring of water glass investment casting. Put the water glass shell into the iron box, put steel sand in the iron box, the steel sand completely covers the water glass shell, then put the iron box on the centrifugal rotary table, pour the molten iron into the water glass through the sprue In the mold shell, after the pouring is completed, let it stand for 30 seconds, turn on the centrifugal rotary table, and rotate the centrifugal rotary table at a speed of 80-100 rpm for 10-15 minutes to obtain qualified castings. The invention strengthens the shell mold by embedding steel sand, prevents the volume expansion of the shell mold during the pouring process, makes the casting casting uniform by adopting the centrifugal rotating workbench, accelerates the filling and filling of the hot joint part of the casting, and reduces the static pressure by reducing the volume of the sprue , Reduce the pressure on the shell, avoid the problems of shrinkage cavity, shrinkage porosity or shell deformation, and the qualified rate of castings has increased from the original 75% to more than 98%.

Description

technical field [0001] The invention relates to a casting pouring method, in particular to a centrifugal pouring method for water glass investment casting. Background technique [0002] At present, our known water glass investment casting mold shell, compared with other two investment casting mold shells (silica sol mold shell, ethyl silicate mold shell), water glass mold shell production cost is low, cycle is short, but Low dimensional accuracy and poor shell strength are only suitable for castings with low manufacturing requirements. As we all know, according to the structure of the casting, the static pressure head of the sprue cup is also different, but it can guarantee the shrinkage. When the casting is cooled, the hot joint is finally solidified, and the static pressure head is insufficient, which often produces "shrinkage cavity" and "shrinkage porosity" casting defects at the hot joint. Therefore, if the thermal junction is large, there must be enough static pressu...

Claims

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Application Information

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IPC IPC(8): B22D13/00
Inventor 黄玉佩徐忠海马勇济
Owner 临清市中远精铸有限责任公司
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