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Production method of thick and large titanium alloy fired mold precision casting

A technology of precision castings and production methods, applied in the direction of molds, cores, mold components, etc., can solve the problems of low quality investment castings, achieve the effects of shortening the production cycle, improving surface quality, and reducing production costs

Inactive Publication Date: 2017-06-13
LUOYANG SUNRUI TI PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects of low quality of existing investment castings, the present invention provides a production method of thick and large titanium alloy investment castings

Method used

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  • Production method of thick and large titanium alloy fired mold precision casting
  • Production method of thick and large titanium alloy fired mold precision casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Example 1: Test object primary pump casing casting

[0056] The first step, wax mold preparation: use the wax injection machine to prepare the wax mold required for production;

[0057] Continuing from the previous step, the second step is wax mold cleaning: use acidic wax mold cleaning solution to clean the wax mold to remove surface oil and debris;

[0058] Continuing from the previous step, the third step is the preparation of the surface layer of the mold shell: the ratio of the surface layer slurry: the mass ratio of 325 mesh yttrium oxide powder to silica sol is 5:1, stir at room temperature 200r / min for 30min, let stand for 50-70min, and wax the mold Stain the wax model with 60-120 mesh yttrium oxide sand after dipping in the slurry, and dry it in a constant temperature and humidity workshop for 24 hours; the temperature in the constant temperature and humidity workshop is 23°C and the humidity is 25%;

[0059] Continuing from the previous step, the fourth step ...

Embodiment 2

[0081] Embodiment 2: The test object is the casting of the mounting bracket

[0082] The first step, wax mold preparation: use the wax injection machine to prepare the wax mold required for production;

[0083] Continuing from the previous step, the second step is wax mold cleaning: use acidic wax mold cleaning solution to clean the wax mold to remove surface oil and debris;

[0084]Continuing from the previous step, the third step is the preparation of the surface layer of the mold shell: the ratio of the surface layer slurry: the ratio of 325 mesh yttrium oxide powder to silica sol is 5:1, stir at room temperature 200r / min for 30 minutes, let stand for 50-70min, and wax the mold Stain the wax model with 60-120 mesh yttrium sand after dipping in the slurry, and dry it in a constant temperature and humidity workshop for 24 hours; the temperature in the constant temperature and humidity workshop is 25°C and the humidity is 40%;

[0085] Continuing from the previous step, the f...

Embodiment 3

[0106] Embodiment 3: The test object is a bracket and a fixed plate

[0107] The first step, wax mold preparation: use the wax injection machine to prepare the wax mold required for production;

[0108] Continuing from the previous step, the second step is wax mold cleaning: use acidic wax mold cleaning solution to clean the wax mold to remove surface oil and debris;

[0109] Continuing from the previous step, the third step is the preparation of the surface layer of the mold shell: the ratio of the surface layer slurry: the ratio of silica sol to 325 mesh yttrium oxide powder is 1:5, stir at room temperature 200r / min for 30 minutes, let stand for 50-70min, and wax the mold Stain the wax model with 60-120 mesh yttrium sand after dipping in the slurry, and dry it in a constant temperature and humidity workshop for 24 hours; the temperature in the constant temperature and humidity workshop is 21°C and the humidity is 35%;

[0110] Continuing from the previous step, the fourth s...

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Abstract

A production method of a thick and large titanium alloy fired mold precision casting comprises the following steps of wax mold preparation, two-time thick liquid adhering, titanium alloy fired mold casting preparation after mold shell back layer preparation, wax removing, high-temperature sintering, pouring, shell cleaning and pouring system removing in a constant-temperature constant-humidity workshop and titanium alloy fired mold precision casting obtaining through quality defect removing of a titanium alloy fired mold casting. According to the production method of the thick and large titanium alloy fired mold precision casting, an innovative technological design philosophy is adopted in the whole process, and the problems of wax-removing face layer re-dissolution, internal residue adding and surface cracking of the thick and large titanium alloy fired mold precision casting are solved through reasonable production technological scheme route formulating, mold shell face layer proportion selecting and pickling technology formulating; and meanwhile, production cost can be effectively reduced, the production period is shortened, the follow-up repairing time is reduced, and the surface quality of the casting is promoted.

Description

technical field [0001] The invention relates to the technical field of titanium alloy investment precision castings, in particular to a production method of thick and large titanium alloy investment precision castings. Background technique [0002] Investment casting is a casting method that uses fusible primary mold material and sequential molding to make the casting shape. The casting produced by this method has low surface roughness and precise size, also known as investment precision casting. At present, in the casting process of titanium alloy investment precision castings, the surface layer material slurry is often made of zirconium acetate solution and yttrium oxide powder. For thick and large titanium alloy castings with a width of more than 300mm×300mm, the wax pattern used in the wax pattern is likely to cause the surface layer to melt back during the dewaxing process, resulting in internal slag inclusions in the casting. In addition, titanium alloy has strong act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C7/02B22C3/00C22F1/18C22F1/02C23G1/10B22D31/00
CPCB22C9/043B22C3/00B22C7/02B22D31/002C22F1/02C22F1/183C23G1/106
Inventor 李伟东刘茵琪周洪强史许娜
Owner LUOYANG SUNRUI TI PRECISION CASTING
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