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Preparation method for guide vane inner ring split combined type hollow ceramic mold core

A technology of hollow ceramics and ceramic cores, which is applied in cores, casting molding equipment, casting molds, etc., can solve the problems of expensive molds, ceramic cores that cannot be burned through, and easy core breakage, so as to improve the product qualification rate, The effect of reducing casting deformation and reducing manufacturing difficulty

Active Publication Date: 2014-09-10
SHENYANG MINGHE QUARTZ PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the integral ceramic core is used to form the complex inner cavity of the inner ring of the guide vane, it will be a major change in the precision casting process of the inner ring of the guide vane. However, the overall ceramic core is complex and large in size, with a maximum size of ￠560, and the cost of manufacturing molds is expensive. , requires a large size sintering furnace, and it is easy to deform and crack during sintering, and the qualified rate of the ceramic core is low
In addition, the overall ceramic core cannot be a hollow structure. Therefore, the ceramic core cannot be burned through, the strengthening effect is not good, the high temperature strength is not good, the core is easy to break and leak during pouring, and the core removal is not good.

Method used

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  • Preparation method for guide vane inner ring split combined type hollow ceramic mold core
  • Preparation method for guide vane inner ring split combined type hollow ceramic mold core
  • Preparation method for guide vane inner ring split combined type hollow ceramic mold core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Prepare raw materials: SiO with a particle size of 220 meshes accounting for 33wt.% of the total weight of raw materials 2 Powder, 21wt.% SiO with a particle size of 300 mesh 2 Powder, 35 wt.% ZrO with a particle size of 300 mesh 2 Mix the powder and 11 wt.% binder, heat to 130°C to form a slurry, stir for 6 hours, then pour the slurry into the barrel of the ceramic core injection machine, and stir for later use;

[0038](2) Pressing the core: Heat the pot mold of the ceramic core to 45°C, control the clamping pressure to 6Mpa, and the grouting pressure to 3Mpa, inject the slurry into the pot mold of the ceramic core, and control the grouting time to 20 second, then keep the pressure for 20 seconds, open the mold, and obtain the basin portion of the ceramic core;

[0039] Replace the mold with a ceramic core back mold, repeat heating, grouting, and pressure holding to obtain the back of the ceramic core;

[0040] Put the basin and the back on the correction mold,...

Embodiment 2

[0047] (1) Prepare raw materials: SiO with a particle size of 220 meshes accounting for 30wt.% of the total weight of raw materials 2 Powder, 18wt.% SiO with a particle size of 300 mesh 2 Powder, 35 wt.% ZrO with a particle size of 300 mesh 2 Mix the powder and 17 wt.% binder, heat to 130°C to form a slurry, stir for 6 hours, then pour the slurry into the barrel of the ceramic core injection machine, and stir for later use;

[0048] (2) Pressing the core: heat the pot mold of the ceramic core to 40°C with a fixture, control the clamping pressure to 6Mpa, and the grouting pressure to 3Mpa, inject the slurry into the pot mold of the ceramic core, and control the grouting time For 20 seconds, then hold the pressure for 20 seconds, open the mold, and obtain the basin portion of the ceramic core;

[0049] Replace the mold with a ceramic core back mold, repeat heating, grouting, and pressure holding to obtain the back of the ceramic core;

[0050] Put the basin and the back on th...

Embodiment 3

[0056] (1) Prepare raw materials: SiO with a particle size of 220 meshes accounting for 37wt.% of the total weight of raw materials 2 Powder, 23wt.% SiO with a particle size of 300 mesh 2 Powder, 32 wt.% ZrO with a particle size of 300 mesh 2 Mix the powder and 8 wt.% binder, heat to 130°C to form a slurry, stir for 6 hours, then pour the slurry into the barrel of the ceramic core injection machine, and stir for later use;

[0057] (2) Compression core: Heat the pot mold of the ceramic core to 50°C with a fixture, control the clamping pressure to 6Mpa, and the grouting pressure to 3Mpa, inject the slurry into the pot mold of the ceramic core, and control the grouting time For 20 seconds, then hold the pressure for 20 seconds, open the mold, and obtain the basin portion of the ceramic core;

[0058] Replace the mold with a ceramic core back mold, repeat heating, grouting, and pressure holding to obtain the back of the ceramic core;

[0059] Put the basin and the back on the ...

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Abstract

The invention specifically relates to a preparation method for a guide vane inner ring split combined type hollow ceramic mold core, which belongs to the technical field of precision casting. The method comprises the following steps: with SiO2 powder, ZrO2 powder and a binder as raw materials, heating the raw materials to 120 to 140 DEG C to form slurry; injecting the slurry into a die so as to obtain a basin part and a back part of the ceramic mold core; combining the basin part and the back part together and roasting the combined basin part and back part in a high temperature furnace; carrying out soaking in a reinforcing liquid for 0.5 to 3 h after roasting so as to obtain split type hollow ceramic mold cores; and placing the five split type hollow ceramic mold cores on a platform, carrying out combining through ceramic chamber linings to eventually form the guide vane inner ring split combined type hollow ceramic mold core and brushing an yttrium sol on joints so as to realize smooth and even transition. According to the invention, the manufacturing difficulty of the ceramic mold core is substantially reduced, the size of the ceramic mold core is effectively controlled, and the ceramic mold core has the advantages of good high temperature strength, easy demolding and the like, thereby achieving the purposes of reduction in casting deformation and improvement of a product qualified rate.

Description

technical field [0001] The invention belongs to the technical field of precision casting, and in particular relates to a method for preparing a guide vane inner ring split combined hollow ceramic core. Background technique [0002] In order to improve the reliability of the engine, the manufacturing quality of important parts in the engine, such as the guide vane inner ring, needs to be improved urgently. In the past, the inner ring of the guide vane was mostly manufactured separately by forgings and castings or castings and castings, and then assembled into a needle body by welding. This manufacturing method has many welding stresses, and the parts are easily deformed. At the same time, it consumes a lot of manpower, material resources and financial resources. Patent No. 2010106147181 discloses a method for preparing the inner ring of the guide vane by opening the process window. Although it breaks through the traditional process of forming the inner ring of the guide vane ...

Claims

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Application Information

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IPC IPC(8): B22C9/10
Inventor 刘玉柱刘畅
Owner SHENYANG MINGHE QUARTZ PROD
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