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Die and method for avoiding shrinkage and slag inclusion of metal mold aerospace casting

A technology for metal molds and castings, used in metal processing equipment, casting molds, cores, etc., can solve the problems of slag inclusion, affecting the cost of castings and shipping requirements, shrinkage porosity, etc., and achieve the effect of reducing shrinkage porosity and slag inclusion.

Active Publication Date: 2017-01-04
鹰普航空科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the structure of the casting is a curved deepening cavity, the minimum wall thickness of the casting is only 2mm, and the casting material is C355, which has poor fluidity, which leads to defects such as shrinkage and slag inclusion in the mass production process of the part, which seriously affects the cost of the casting and delivery requirements.

Method used

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  • Die and method for avoiding shrinkage and slag inclusion of metal mold aerospace casting
  • Die and method for avoiding shrinkage and slag inclusion of metal mold aerospace casting
  • Die and method for avoiding shrinkage and slag inclusion of metal mold aerospace casting

Examples

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Effect test

manufacture Embodiment 1

[0026] To solve the method of shrinkage and slag inclusion of metal-type aviation castings, cast metal-type aviation castings according to the following steps:

[0027] (1) Use high-strength coated sand to make the inner sand core 3 of the pipeline, and use low-outgassing coated sand to make the outer shell sand core 2, then dip the sand core with paint, and brush the surface of the sand core 3 in the pipeline after drying Apply a layer of chilled paint and drill vent holes;

[0028] (2) Place the mold horizontally first, heat it to 150°C, prepare to paint the mold after it reaches temperature, evenly spread refractory fiber paste on the sprue 1a, sprue riser and dark riser 1b of the mold body 1, and then brush FOSECO 34# thermal insulation coating;

[0029] (3) After the above processes are ready, start casting. After opening the mold, gently put the inner sand core 3 and the outer shell sand core 2 prepared in step (1) into the corresponding positions in the mold body 1, an...

manufacture Embodiment 2

[0031] To solve the method of shrinkage and slag inclusion of metal-type aviation castings, cast metal-type aviation castings according to the following steps:

[0032] (1) Use high-strength coated sand to make the inner sand core 3 of the pipeline, and use low-outgassing coated sand to make the outer shell sand core 2, then dip the sand core with paint, and brush the surface of the sand core 3 in the pipeline after drying Apply a layer of chilled paint and drill vent holes;

[0033] (2) Place the mold horizontally first, heat it to 175°C, prepare to paint the mold after it reaches temperature, evenly spread refractory fiber paste on the runner 1a, sprue riser and dark riser 1b of the mold body 1, and then brush FOSECO 34# thermal insulation coating;

[0034] (3) After the above processes are ready, start casting. After opening the mold, gently put the inner sand core 3 and the outer shell sand core 2 prepared in step (1) into the corresponding positions in the mold body 1, a...

manufacture Embodiment 3

[0036] To solve the method of shrinkage and slag inclusion of metal-type aviation castings, cast metal-type aviation castings according to the following steps:

[0037] (1) Use high-strength coated sand to make the inner sand core 3 of the pipeline, and use low-outgassing coated sand to make the outer shell sand core 2, then dip the sand core with paint, and brush the surface of the sand core 3 in the pipeline after drying Apply a layer of chilled paint and drill vent holes;

[0038] (2) Place the mold horizontally first, heat it to 200°C, prepare to paint the mold after it reaches temperature, evenly spread refractory fiber paste on the runner 1a, sprue riser and dark riser 1b of the mold body 1, and then brush FOSECO 34# thermal insulation coating;

[0039] (3) After the above processes are ready, start casting. After opening the mold, gently put the inner sand core 3 and the outer shell sand core 2 prepared in step (1) into the corresponding positions in the mold body 1, a...

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Abstract

The invention relates to a die for avoiding shrinkage and slag inclusion of a metal mold aerospace casting. The die comprises a die body, a shell sand core and a pipeline internal sand core, and is characterized in that the shell sand core is made of low-gas-evolution precoated sand, and the pipeline internal sand core is made of high-strength precoated sand. The invention further discloses a method for avoiding shrinkage and slag inclusion of the metal mold aerospace casting. By comprehensive application of various technical methods including replacing common precoated sand by high-strength and low-gas-evolution precoated sand, coating the surfaces of the sand cores with chilled coatings, reasonable metal mold pouring gate design, reasonable layout of closed risers and slag discharge channels and refining treatment of molten aluminum in die smelting prevention, the problems of shrinkage and slag inclusion of the metal mold aerospace casting in the production process can be greatly decreased, and the qualification rate of the casting reaches 80% or more.

Description

technical field [0001] The invention relates to a mold and a method for solving shrinkage porosity and slag inclusion of metal-type aviation castings, and belongs to the field of aviation metal-type casting alloys. Background technique [0002] At present, our factory produces a kind of aviation cover castings, the shape of the inner cavity is complex, the size, fluorescence, and x-ray grade requirements are high, and no slag inclusion defects are allowed on the surface after processing. The existing technology is to adopt the technology casting of metal mold + sand core, and use coated sand as the inner core of the mold cavity. Since the structure of the casting is a curved deep cavity, the minimum wall thickness of the casting is only 2mm, and the casting material is C355, which has poor fluidity, resulting in defects such as shrinkage porosity and slag inclusion during the mass production of the part, which seriously affects the cost of the casting and shipping requiremen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/22B22C9/06B22C1/00B22C3/00B22C9/08B22C9/10
CPCB22C1/00B22C3/00B22C9/06B22C9/082B22C9/088B22C9/10B22C9/22
Inventor 于洋庄绪雷史兴利
Owner 鹰普航空科技有限公司
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