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Fired mold low-pressure casting process of integral type compressor impeller

A low-pressure casting and compressor technology, used in manufacturing tools, casting molding equipment, casting molds, etc., can solve the problems of large difference in wall thickness of impeller castings and high requirements for tissue density, and achieve high production efficiency, low labor intensity, and castings. The effect of dense tissue

Inactive Publication Date: 2014-03-26
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Integral compressor impeller castings have large wall thickness differences and require high structure density, which cannot be met by general low-pressure casting processes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0018] Shell: silica sol binder SiO 2 The content is 20%, the surface layer and the second layer of refractory materials are fused corundum powder and sand, and the reinforcement layer is mullite powder and sand specially used for investment casting; the viscosity of the surface layer coating is 40s, and the density is 2.1g / cm 3 , Tuhang 80# fused corundum sand, the viscosity of the second layer coating is 30s, and the density is 2.0g / cm 3 , Tuhang 60# fused corundum sand, two kinds of coatings are used for the reinforcement layer, one coating has a viscosity of 10s and a density of 1.81g / cm 3 , another paint with a viscosity of 25s and a density of 1.86g / cm 3 When applying the reinforcement layer paint, first dip the thin paint, and then dip the thick paint. The particle size of the sand is 30-50#, 20-40#, 20-40#, 12-20#, and finally apply a layer of paint with a viscosity of 25s. Coating; After the coated shell is placed for 4 hours, the fusible mold is removed by autoclav...

specific Embodiment 2

[0023] Shell: silica sol binder SiO 2 The content is 20%, the surface layer and the second layer of refractory materials are fused corundum powder and sand, and the reinforcement layer is mullite powder and sand specially used for investment casting; the viscosity of the surface layer coating is 43s, and the density is 2.14g / cm 3 , Tuhang 80# fused corundum sand, the viscosity of the second layer coating is 33s, and the density is 2.05g / cm 3 , Tuhang 60# fused corundum sand, two kinds of coatings are used for the reinforcement layer, one coating has a viscosity of 12s and a density of 1.82g / cm 3 , another paint viscosity 28s, density 1.91g / cm 3 When applying the reinforcement layer paint, first dip the thin paint, and then dip the thick paint. The particle size of the sand is 30-50#, 20-40#, 20-40#, 12-20#, and finally apply a layer of paint with a viscosity of 28s. Coating; After the coated shell is placed for 4 hours, the fusible mold is removed by autoclave;

[0024] Low...

specific Embodiment 3

[0028] Shell: silica sol binder SiO 2 The content is 20%, the surface layer and the second layer of refractory materials are fused corundum powder and sand, and the reinforcement layer is mullite powder and sand specially used for investment casting; the viscosity of the surface layer coating is 45s, and the density is 2.19g / cm 3 , Tuhang 80# fused corundum sand, the viscosity of the second layer of paint is 35s, and the density is 2.1g / cm 3 , Tuhang 60# fused corundum sand, two kinds of coatings are used for the reinforcement layer, one coating has a viscosity of 13s and a density of 1.83g / cm 3 , another paint with a viscosity of 30s and a density of 1.94g / cm 3 When applying the reinforcement layer paint, first dip the thin paint, and then dip the thick paint. The particle size of the sand is 30-50#, 20-40#, 20-40#, 12-20#, and finally apply a layer of paint with a viscosity of 30s. Coating; After the coated shell is placed for 4 hours, the fusible mold is removed by autocl...

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Abstract

The invention provides a fired mold low-pressure casting process of an integral type compressor impeller. The process comprises the following steps of preparing coating with silica sol binder for fired mold casting, wherein a fireproofing surface layer and a second layer are made of fused alumina powder and sand, and a reinforced layer is made of mullite powder and sand special for fired mold casting; when coating the coating on the reinforced layer, adopting a two-time slurry staining method, i.e. firstly staining thin coating and secondly staining thick coating; and after dewaxing a shell, roasting at the low temperature of 500 DEG C, storing, and roasting at high temperature before pouring, wherein the temperature of high-temperature roasting is 1000 DEG C, the heat preservation time is 4h, and the temperature of the shell during pouring is 100-150 DEG C. The prepared shell is high in strength, low-pressure pouring can be carried out by utilizing a single shell, the pouring temperature of molten aluminum is 670-680 DEG C, the mold-filling pressure is 0.03 MPa, the mold-filling time is 10s, the solidification holding pressure is 0.35 MPa, and the holding pressure time is 5min. The integral type compressor impeller produced by adopting the fired mold low-pressure casting process is good in mold-filling and feeding effect, compact in casting tissue, good in product mechanical property and inner quality, high in production efficiency, and low in labor intensity, and has no need to be modeled through binning.

Description

technical field [0001] The invention relates to a casting process of an aluminum alloy part, in particular to a casting process of an aluminum alloy impeller. Background technique [0002] The investment casting production process includes fusible mold pressing, module welding, coating preparation, sand hanging, dewaxing, shell baking, and pouring. Compared with other casting methods, investment castings have high dimensional accuracy and surface roughness, and are often used for parts that require high dimensional accuracy and surface roughness but are not easy to process, especially castings with complex structures that are not easy to shape by other casting methods. It is commonly produced by investment casting method. [0003] The integral compressor impeller on the turbocharger of a large diesel engine has a working speed of 32500r / min (rpm), a disc diameter of Φ210mm, and a number of 19 blades. The blades are curved and variable in thickness, and the thinnest part is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22D18/04
Inventor 王桂青刘燕任国成
Owner SHANDONG JIANZHU UNIV
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