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Facing sand/back sand making technology of steel casting green sands

A preparation process, a technology for green sand, which is used in manufacturing tools, casting equipment, machinery for cleaning/processing of casting materials, etc. The effect of sand expansion defect, simple process, high economic value and social value

Inactive Publication Date: 2011-04-06
CRRC YANGTZE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a green mold sand surface sand / back sand preparation process for steel castings that effectively solves the problem that green mold sand is prone to sand washing and sand expansion defects

Method used

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  • Facing sand/back sand making technology of steel casting green sands

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Embodiment 1

[0011] A preparation process for green sand surface sand of steel castings, which includes the following steps, 1) selecting a suitable mixing machine and cleaning the mixing machine with water; 2) adding regenerated sand of a fixed quality to the mixing machine; 3) Add bentonite and starch to the above-mentioned recycled sand to obtain a mixture, the mass ratio of bentonite to the mixture is m, and the mass ratio of starch to the mixture is n, wherein, 3.5%≥m≥2.0, 0.5%≥n≥0.1%; 4) Add water in the mixing machine, wherein the added water accounts for 0.5-1% of the mass ratio of the final mixture, fully mix and grind for 80-100 seconds, and the prepared surface sand can be obtained by sanding out.

Embodiment 2

[0013] A preparation process of green sand surface sand for steel castings, which includes the following steps, 1) selecting a suitable mixing machine and cleaning the mixing machine with water; 2) adding a mixture of new sand and regenerated sand of a certain quality into the mixing machine , the mass ratio of the regenerated sand to the above mixture is 90%, and the new sand accounts for 10%, and the mass ratio of the new sand to the above mixture is s, wherein 10%≥s≥0; 3) adding Bentonite and starch to obtain the final mixture, the mass ratio of bentonite to the mixture of new sand and regenerated sand is m, and the mass ratio of starch to the mixture of new sand and regenerated sand is n, wherein, 3.5%≥m≥2.0, 0.5%≥n≥0.1%; 4) Add water in the mixing machine, wherein the added water accounts for 0.5-1% of the mass ratio of the final mixture, fully mix and grind for 80-100 seconds, and the prepared surface sand can be obtained by sanding out.

Embodiment 3

[0015] A preparation process of green sand surface sand for steel castings, which includes the following steps, 1) selecting a suitable mixing machine and cleaning the mixing machine with water; 2) adding a mixture of new sand and regenerated sand of a certain quality into the mixing machine , the mass ratio of the regenerated sand to the above mixture is 95%, and the new sand accounts for 5%, and the mass ratio of the new sand to the above mixture is s, wherein 10%≥s≥0; 3) adding Bentonite and starch to obtain the final mixture, the mass ratio of bentonite to the mixture of new sand and regenerated sand is m, and the mass ratio of starch to the mixture of new sand and regenerated sand is n, wherein, 3.5%≥m≥2.0, 0.5%≥n≥0.1%; 4) Add water in the mixing machine, wherein the added water accounts for 0.5-1% of the mass ratio of the final mixture, fully mix and grind for 80-100 seconds, and the prepared surface sand can be obtained by sanding out.

[0016] In the surface sand prepa...

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Abstract

The invention relates to a facing sand / back sand making technology of steel casting green sands. The facing sand making technology comprises the following steps of: firstly, selecting a suitable mixing and rolling machine, and cleaning the mixing and rolling machine with water; secondly, weighing a mixture of new sands and reclaimed sands with fixed quality, and adding into the mixing and rolling machine, wherein quality occupation ratio of the reclaimed sands in the mixture is t which is no more than 100 percent and no less than 90 percent, and the quality occupation ratio of the new sands in the mixture is s which is more than 10 percent and no less than 0 percent; thirdly, respectively adding bentonite and starches in the mixture to obtain a final mixture, wherein the mass ratio of the bentonite occupying a primary mixture is m which is no more than 3.5 percent and no less than 2.0 percent, and mass ratio of the starches occupying a primary mixture is n which is no more than 0.5 percent and no less than 0.1 percent; fourthly, replenishing water in the mixing and rolling machine, and fully mixing and rolling for 80-100s, wherein the mass ratio of the replenished water occupying the final mixture is 0.5-1 percent. The invention has simple technology. In the invention, molding sands which accord with performance indexes of the green sands are mixed and made according to the proportion of the green sands and can be used for producing a high-rigidity sand mold, thereby efficiently overcoming the defects of sand washing and swells.

Description

technical field [0001] The invention relates to a preparation process of green mold sand for steel castings, in particular to a preparation process of green sand surface sand / back sand for steel castings. Background technique [0002] The green sand process has many advantages such as high production efficiency, high reuse rate of old sand, good casting surface roughness, less sand cleaning workload, and low production cost. However, green sand is prone to sand washing and sand swelling defects. Therefore, it is necessary to improve the performance of green mold sand, but at present, engineers and technicians have not found a suitable preparation process. Contents of the invention [0003] In order to overcome the deficiencies of the prior art, the present invention provides a green sand surface / back sand preparation process for steel castings that effectively solves the problems that green sand is prone to sand washing and sand expansion defects. [0004] The technical s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C5/04B22C1/00
Inventor 王连华何氢玲汪焱
Owner CRRC YANGTZE CO LTD