Method for making core with aeration ossification

A gas hardening, core sand technology, applied in the direction of cores, manufacturing tools, casting and molding equipment, etc., can solve the problems of alloy casting application limitations, large loss of sand core strength, affecting popularization and application, etc., to achieve low cost of core making, manufacturing Short cycle and good flexibility

Inactive Publication Date: 2008-10-29
SHENYANG HYATON FOUNDRY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The disadvantage of this process is: the binder contains nitrogen, and the application of alloy castings sensitive to nitrogen pores is limited
However, the above two i

Method used

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  • Method for making core with aeration ossification
  • Method for making core with aeration ossification
  • Method for making core with aeration ossification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 1200g of standard sand for casting binder and put it into ST195 cement mortar mixer, add 30g of ZS2.50 casting water glass and 3g of glyceryl triacetate in accordance with JB / T8835 standard, stir for 60s to produce sand, and mix the above Put the sand mixture into the sand shooting cylinder of Z861 core shooting machine, use Z861 core shooting machine to shoot the standard "8" shape sample under the pressure of 0.4 ~ 0.6Mpa, remove the sand shooting cylinder, seal the sand shooting port, and turn on the FXS gas Generator solenoid valve, so that the mixed gas containing 60% methyl formate, 40% ethanol, and air volume accounts for 30% of the hardening mixture is passed into the core box for 10 to 30 seconds, the hardening gas source is closed, and the hot air blowing valve is opened for 3 seconds. , into 50 ~ 100 ℃ hot air for 60 ~ 80s, after the end of blowing, stop the air supply, open the core box, take out the "8" shape sample. Use the SWY hydraulic strength tes...

Embodiment 2

[0036] Embodiment 2, Embodiment 3, Embodiment 4, Embodiment 5, Embodiment 6, Embodiment 7, and Embodiment 8 respectively take standards JB / T8835, ZS2.90 casting water glass and standards Q / HYT.01 New water glass S101, S102, S103, S104, S105, S106 for casting, other conditions are the same as in Example 1, and the obtained detection strengths are listed in Table 1.

[0037] Table 1 Effect of different water glasses on mechanical properties

[0038]

Embodiment 9

[0039] Embodiment 9, embodiment 10, embodiment 11, embodiment 12, embodiment 13, embodiment 14, embodiment 15, embodiment 16, embodiment 17, embodiment 18, implementation procedure is identical with embodiment 1, adopts water The glass is all S103, the hardening gas carrier is nitrogen, and nitrogen accounts for the volume percentage of hardening gas. The implementation conditions are listed in Table 2, and the conditions not listed are the same as in Example 1. The hardened samples are measured immediately and 24h tensile strength respectively, and List the results in Table 2.

[0040] Table 2 Effect of different air-hard gases on mechanical properties

[0041]

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Abstract

The invention discloses a core making method by gas-blowing hardening, which is characterized in that the mass percentage of mixing materials of the making core sand is as follows: 0.9-7.0 percent of soluble glass, 0.1-1.0 percent of moisture absorption resistant agent and raw sand for the rest; the used moisture absorption resistant agent can be triacetyl glycerine, diacetin, glycerol mono acetate bulk, diethylene glycol acetic ester, propylene glycol acetic ester, other polylol organic acid ester or the mixture thereof; the volume percentage of the blowing gas for hardening is as follows: 25-100 percent of C2-C4 organic ester and 0-75 percent of C1-C2 alcohols. The method of the invention has no toxicity and odor in production process, and the produced cores have better stripping strength.

Description

technical field [0001] The invention relates to casting technology, and in particular provides a method for preparing sand cores through air blow hardening. Background technique [0002] The binder used in casting production and its core-making process are directly related to the quality of castings, casting productivity, labor environment, production cost and impact on the ecological environment. In the past, the foundry used the clay sand drying method to make cores. Later, vegetable oil and synthetic lipid thermosetting substances were used as sand core binders. The sand cores were compacted by hand, and the working conditions were harsh. It takes hours to harden, high energy consumption, long production cycle, easy deformation of the sand core, high breakage rate during handling, and affects the quality of castings. After World War II, the technology of shell core and hot core box was promoted. The shell core and hot core box used thermosetting synthetic resin as the bi...

Claims

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Application Information

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IPC IPC(8): B22C9/10
Inventor 余明伟
Owner SHENYANG HYATON FOUNDRY MATERIAL
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