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CN-122007342-A - Pouring channel system for melt deep uniform supercooling nucleation and application method thereof

CN122007342ACN 122007342 ACN122007342 ACN 122007342ACN-122007342-A

Abstract

The invention belongs to the field of material processing, and particularly relates to a pouring channel system for melt deep uniform supercooling nucleation and an application method thereof. The pouring channel system for uniformly supercooling and nucleation of the melt depth comprises a pouring gate and at least one main pouring channel connected with the pouring gate, wherein the main pouring channel is an S-shaped bending and extending pipeline, the cross section of the pipeline is gradually reduced from an inlet to an outlet, and the outlet of the main pouring channel is connected with a casting mould. Alloy melt is poured from a pouring gate and flows into a continuous S-shaped main pouring gate, when turning, the impact temperature of the melt at the central part of a pouring gate pipe is far lower than the pipe wall surface of the melt under the action of inertia, so that the melt is in a supercooled state to excite the internal nucleation of the melt, and through continuous repeated longitudinal and transverse stirring, the melt entering a casting mould through the S-shaped main pouring gate is in the same supercooled state, and meanwhile, the turbulence in the melt also increases dendrite falling off, so that the nucleation proliferation is the superposition of strong supercooling proliferation and convection stirring proliferation effects.

Inventors

  • DENG PEIRAN
  • SONG JIACHENG

Assignees

  • 上海工程技术大学

Dates

Publication Date
20260512
Application Date
20260303

Claims (7)

  1. 1. The utility model provides a runner system of even supercooling nucleation of fuse-element depth, includes runner (1), with runner (1) connected at least one main runner (2), its characterized in that: The main pouring channel (2) is an S-shaped bending and extending pipeline, the inlet to the outlet of the cross section of the pipeline is gradually reduced, and the outlet of the main pouring channel (2) is connected with the casting mould.
  2. 2. The runner system as claimed in claim 1, wherein the piping of the main runner (2) is divided into 2-3 sections, each section having an equal diameter.
  3. 3. The runner system as claimed in claim 1, wherein the inlet to outlet of the main runner (2) is arranged in a downwardly inclined manner.
  4. 4. The runner system according to claim 1, wherein the main runner (2) is circular in cross section.
  5. 5. The runner system according to claim 1, characterized in that the bending degree of the S-shaped extending pipe of the main runner (2) varies from gentle to turbulent.
  6. 6. The method for applying the runner system for melt deep uniform supercooling nucleation according to claim 1, comprising the steps of: S1, melting alloy metal, and reserving molten alloy liquid; S2, pouring the molten alloy in the step S1 into a gate (1), and enabling the alloy to flow into a pipeline of an S-shaped main runner (2) from the gate (1) and finally flow into a casting mold for solidification forming.
  7. 7. A method of using the runner system as described in claim 1 wherein the alloying metal in S1 is a tin bronze alloy having a tin mass ratio of 10wt%, iron of 0.05wt%, phosphorus of 0.03wt%, and the balance copper.

Description

Pouring channel system for melt deep uniform supercooling nucleation and application method thereof Technical Field The invention belongs to the field of material processing, and particularly relates to a pouring channel system for melt deep uniform supercooling nucleation and an application method thereof. Background In the casting production, a fine grain structure is expected to be obtained generally, and the mechanical property of the material can be improved obviously due to grain refinement, so that the exploration of an optimization technical route for refining grains in the casting solidification process is an important direction of continuous research in the field of materials. The current grain refinement method mainly comprises two types of adding an modifier and applying an external field. The mode of adding modifier can generally only raise grain size by 1-2 grades under the set solidification condition, and has limited refining effect, while the external field is unsuitable in the solidification process of many castings, and the external field is generally applied to increase convection of melt and break dendrite, thereby improving nucleation rate and refining dendrite. Increasing the degree of supercooling of the melt is an efficient means of increasing the nucleation rate, but since the solidification process is an inside-out process, deep supercooling of the melt is generally more difficult to achieve. If deep supercooling and convection of the melt can be realized, the grain nucleation proliferation in the solidification process is very favorable to obtain a fine-grained casting structure, the invention focuses on realizing deep supercooling of a melt through a pouring system body in a forming process without using equipment such as an external field or high pressure, thereby enhancing the nucleation rate in a solidification process and realizing the fine grain structure of a casting. Disclosure of Invention The invention aims to provide a pouring gate system for melt deep uniform supercooling nucleation, which realizes deep synchronous supercooling and melt internal flushing under the dual actions of self gravity and inertia of a melt through the structural design of a continuous S-shaped pouring gate, thereby promoting the melt internal uniform nucleation and grain proliferation and finally achieving the technical effect of refining casting grains. In the pouring gate system in the prior art, a solidification layer can be rapidly formed on the wall surface of a pouring gate in the forward longitudinal flow process of a melt, a high-temperature region is arranged at the center of the melt, a liquid-solid phase region between the solidification layer and the high-temperature region of the center is very narrow, the liquid-solid phase region is supercooled, the melt is in a turbulent state, but in the center of the melt, a non-supercooled region is formed, the number of nucleation grains is small, remelting of the nucleation grains is easy to occur, and dendrite falling and grain proliferation effects caused by melt scouring are not obvious. In the process of melt flow, if the transverse movement of the melt is enhanced, the continuous contact between the melt at the core and the cold wall surface of the pouring channel can be realized, and the repeated transverse movement enables the core of the melt and the edge area of the tube wall to reach a supercooled state with high approximation, so that the nucleation rate is improved, and meanwhile, the strong scouring action of the melt can further promote the dendrite shedding of nucleation grains, so that the grain proliferation effect is more obvious. The aim of the invention can be achieved by the following technical scheme: The pouring channel system for the melt deep uniform supercooling nucleation comprises a pouring gate and at least one main pouring channel connected with the pouring gate, wherein the main pouring channel is an S-shaped bending and extending pipeline, the cross section of the pipeline is gradually reduced from an inlet to an outlet, and the outlet of the main pouring channel is connected with a casting mould. Alloy melt is poured from a pouring gate and flows into a continuous S-shaped main pouring gate, when turning, the impact temperature of the melt at the central part of a pouring gate pipe is far lower than the pipe wall surface of the melt under the inertia effect, so that the melt is in a supercooled state to excite the internal nucleation of the melt, and through such continuous repeated longitudinal and transverse stirring, the melt entering a casting mold through the S-shaped main pouring gate is in the same supercooled state, namely uniformly supercooled, and the characteristic that the integral supercooling degree of the melt is the same can effectively prevent the growth of columnar crystals during solidification, and the scale difference of crystal grains of the whole casting is smaller, meanwhile, the tur