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Ferromagnetic Alloy Vacuum Melting Casting Short Process Precision Casting Method

A precision casting and ferromagnetic technology, applied in the direction of casting molding equipment, etc., can solve the problems of inability to solve the problems of alloy smelting oxidation burning and gas absorption, the temperature loss of pouring and filling liquid alloys, and the inability to effectively improve the metallurgical quality of castings, etc., to achieve Avoid shell cracking and liquid alloy temperature loss, avoid pouring liquid alloy temperature loss, and improve the quality of castings

Active Publication Date: 2020-07-10
JIANGYIN UNI POL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the above two precision methods combine investment casting and lost foam casting well, and save the investment casting dewaxing process in the process, the mold shell or shell must be injected with molten metal at high temperature, otherwise, Under the thermal shock of high-temperature metal, the shell or shell is prone to cracking or even bursting, and it cannot solve the problems of oxidation burning and gas absorption in the process of alloy smelting and pouring. There is a problem of liquid alloy temperature loss in pouring and filling, which cannot effectively improve the inherent metallurgical quality of castings.

Method used

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  • Ferromagnetic Alloy Vacuum Melting Casting Short Process Precision Casting Method

Examples

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Effect test

Embodiment 1

[0031] Utilize the ferromagnetic alloy vacuum melting and casting short flow precision casting method of the present invention, trial-manufacture the turbine impeller of automobile turbocharger, for example J130B turbine impeller, comprise the following steps:

[0032] Step 1. Determine the casting process plan according to the shape and structure of the impeller. Three pieces of one type are uniformly distributed at 120° on the same horizontal plane. The pattern material is polypropylene, and the pattern forming processing mold is designed and manufactured.

[0033] Step 2, using polystyrene to manufacture the cylindrical charging cavity pattern, the casting molding injection port pattern and the impeller casting pattern by the injection molding method, and the charging cavity pattern and the injection port pattern are integrated injection molding.

[0034]Step 3, assembling the shape of the cylindrical charging cavity, the shape of the casting injection port and the shape of ...

Embodiment 2

[0041] The production of automobile turbocharger turbine impeller J130B by investment casting in the traditional way includes the following steps:

[0042] Step 1. Determine the casting process plan according to the shape and structure of the impeller. Three pieces of one type are evenly distributed at 120° on the same horizontal plane. Design the pouring system. The wax mold is made of medium-temperature wax, and the wax mold molding mold is designed and manufactured.

[0043] Step 2, making sprue cup, sprue, inner sprue and casting wax mold with medium temperature wax.

[0044] Step 3, according to the design requirements of the casting process, the sprue cup, the sprue, the inner runner and the casting pattern of the impeller are welded into an integral wax mold group and trimmed.

[0045] Step 3: Dip-coat the surface layer slurry, shake the slurry, sprinkle surface sand, and dry for 26 to 28 hours to make the surface layer; after the surface layer is dried, dip-coat the ba...

Embodiment 3

[0051] Utilize the ferromagnetic alloy vacuum melting and casting short flow precision casting method of the present invention, trial-manufacture the turbine impeller of automobile turbocharger, for example K418superalloy SJ50 turbine impeller, comprise the following steps:

[0052] Step 1. Determine the casting process plan according to the shape and structure of the impeller. There are 6 pieces in the first type, which are distributed in two different horizontal positions. The 3 pieces in each horizontal position are evenly distributed at 120°, and the castings in the two different horizontal positions are arranged in a 60° cross arrangement. , The shape material is made of polyethylene, and the shape forming processing mold is designed and manufactured.

[0053] Step 2, using polyethylene to manufacture a cylindrical charging cavity pattern, a casting molding injection port pattern and an impeller casting pattern by injection molding, the charging cavity pattern and the inje...

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Abstract

DETAILED DESCRIPTION OF THE INVENTION that present invention provide a method for improving the inherent metallurgical quality of casting, A ferromagnetic alloy vacuum melting and casting short-process precision casting method for shortening investment casting process flow is disclosed, No dewaxing, no pouring, By adopting the process method of the combination of shell preparation and melting-casting molding and the integration of alloy melting-casting and casting molding, As that prepare mold shell is used as a melting and cast alloy crucible, The high frequency vacuum induction furnace is used to melt the ferromagnetic alloy in the mold shell to obtain the castings, which reduces the traditional investment casting production process, shortens the casting process and production cycle, andnot only improves the production efficiency, but also improves the quality of the castings and the yield of the castings.

Description

technical field [0001] The invention belongs to the technical field of precision casting, and specifically relates to a short-flow precision casting method for vacuum melting and casting of ferromagnetic alloys for shell preparation, alloy smelting and filling and solidification. It is a method for improving the internal metallurgical quality of castings, shortening the investment casting process, It is a casting process method that combines mold shell preparation with melting and casting molding, and alloy melting and casting and casting forming. Background technique [0002] Investment casting is a near-net shape process and the most commonly used casting method for precision casting production. Investment casting is to use fusible materials to make patterns, coat the fusible patterns with multi-layer refractory materials, and after they are hardened and dried, the patterns are melted and removed to make shells, and the shells are cast after high-temperature roasting to ob...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C7/02
CPCB22C7/02B22D23/06
Inventor 刘惠明王再友王章忠姚标
Owner JIANGYIN UNI POL
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