Ferromagnetic alloy vacuum melting and casting short-process precision casting method

A technology of precision casting and short process, which is applied in the field of casting technology, ferromagnetic alloy vacuum melting casting and short process precision casting, which can solve the problems of alloy smelting, oxidation burning and air absorption, temperature loss of pouring and filling liquid alloy, and ineffectiveness. Improve the metallurgical quality of castings and other issues, to avoid shell cracking and liquid alloy temperature loss, avoid pouring liquid alloy temperature loss, and improve the quality of castings

Active Publication Date: 2018-11-27
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 o

Method used

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  • Ferromagnetic alloy vacuum melting and casting short-process precision casting method
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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0030] [Example 1]

[0031] Using the ferromagnetic alloy vacuum melting and casting short-flow precision casting method of the present invention, trial production of a turbine impeller of an automobile turbocharger, such as a J130B turbine impeller, includes the following steps:

[0032] Step 1: Determine the casting process plan according to the shape and structure of the impeller. One type of 3 pieces is evenly distributed at 120° on the same horizontal plane. The pattern material is polypropylene, and the pattern forming processing mold is designed and manufactured.

[0033] In step 2, a cylindrical charging cavity pattern, a casting molding injection port pattern and an impeller casting pattern are manufactured from polystyrene by an injection molding method, and the charging cavity pattern and the injection port pattern are integrated injection molding.

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

Example Embodiment

[0040] [Example 2]

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

[0042] Step 1. Determine the casting process plan according to the shape and structure of the impeller. There are 3 pieces of one type, and they are evenly distributed at 120° on the same horizontal plane.

[0043] Step 2: Use medium temperature wax to make sprue cup, sprue, sprue and casting wax mold.

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

[0045] In step 3, the assembled and welded integral wax mold is sequentially dipped and coated with the surface layer slurry, thrown out, sprayed with surface sand, and dried for 26 to 28 hours to make a surface layer; after the surface layer is dried, dip-coat the back layer slurry, Sand and dry for 6-...

Example Embodiment

[0050] [Example 3]

[0051] Using the ferromagnetic alloy vacuum melting and casting short-flow precision casting method of the present invention, trial production of a turbine impeller of an automobile turbocharger, such as a K418superalloy SJ50 turbine impeller, includes the following steps:

[0052] Step 1. Determine the casting process plan according to the shape and structure of the impeller. One type has 6 pieces, which are distributed on two different horizontal plane positions. Each horizontal plane position has 3 pieces evenly distributed at 120°, and the castings are arranged at 60° on two different horizontal plane positions. , The pattern material is made of polyethylene, and the pattern forming processing mold is designed and manufactured.

[0053] In step 2, a cylindrical charging cavity pattern, a casting molding sprue pattern and an impeller casting pattern are manufactured from polyethylene by an injection molding method, and the charging cavity pattern and th...

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