阅读说明：本技术 基于熔体混合的半固态制浆工艺 (Semi-solid pulping process based on melt mixing ) 是由 王连登 王火生 王沁峰 于 2021-01-11 设计创作，主要内容包括：本发明提出了基于熔体混合的半固态制浆工艺,包括以下步骤：S1、混合：将高温合金熔体A和低温合金熔体B混合成合金混合熔体；S2、搅拌：通过搅拌装置将合金混合熔体分为两股环形流动的流体,两股流体交汇并在交汇处对流碰撞；S3、保温：搅拌好的合金混合熔体置于保温环境中保温；S4、成型：当保温环境中的合金混合熔体达到规定的固相率后,将合金混合熔体倒入到成型设备中获得制件。本发明的工艺步骤简单、制浆效率高、混合均匀、形核率高、粘度好、固相率好、成本低。(The invention provides a semi-solid pulping process based on melt mixing, which comprises the following steps: s1, mixing: mixing the high-temperature alloy melt A and the low-temperature alloy melt B into an alloy mixed melt; s2, stirring: dividing the alloy mixed melt into two annularly flowing fluids by a stirring device, wherein the two fluids are converged and convectively collided at the junction; s3, heat preservation: placing the stirred alloy mixed melt in a heat preservation environment for heat preservation; s4, molding: and when the alloy mixed melt in the heat preservation environment reaches the specified solid phase rate, pouring the alloy mixed melt into a forming device to obtain a finished piece. The invention has the advantages of simple process steps, high pulping efficiency, uniform mixing, high nucleation rate, good viscosity, good solid phase rate and low cost.)

1. The semi-solid pulping process based on melt mixing is characterized by comprising the following steps of:

s1, mixing: mixing a high-temperature alloy melt A and a low-temperature alloy melt B into an alloy mixed melt, wherein the temperature of the high-temperature alloy melt A is 70-150 ℃ above the liquidus line, the temperature of the low-temperature alloy melt B is-10 ℃ to +20 ℃ of the liquidus line, and the mass ratio of the high-temperature alloy melt A to the low-temperature alloy melt B is (1-2): 1;

s2, stirring: dividing the alloy mixed melt into two annularly flowing fluids by a stirring device, wherein the two fluids are converged and convectively collided at the junction;

s3, heat preservation: placing the stirred alloy mixed melt in a heat preservation environment for heat preservation;

s4, molding: and when the alloy mixed melt in the heat preservation environment reaches the specified solid phase rate, pouring the alloy mixed melt into a forming device to obtain a finished piece.

2. The semi-solid pulping process based on melt mixing of claim 1, wherein: the alloy melt A and the alloy melt B have the same or different components.

3. The semi-solid pulping process based on melt mixing of claim 2, wherein: the stirring device is a mechanical stirring device or an electromagnetic stirring device.

Technical Field

The invention relates to a semi-solid pulping process, in particular to a semi-solid pulping process based on melt mixing.

Background

The semi-solid pulping technology can refine grains of the light alloy melt, improve the viscosity of the light alloy material, improve the resistance of the material in the forming process, generate laminar motion in the forming process of the light alloy material, avoid the phenomenon of flying or splashing, be beneficial to reducing the generation of porosity in the forming process and improve the density of the material; meanwhile, the stirring effect in the semi-solid pulping process enables crystal grains to be refined or spheroidized, and the mechanical property of the molded part is improved.

However, the existing semi-solid pulping process generally has the problems of low pulping efficiency, uneven mixing, low nucleation rate, low viscosity, low solid phase rate, complex process, high cost and the like, and the development and the application of the semi-solid technology are restricted.

Disclosure of Invention

The invention provides a semi-solid pulping process based on melt mixing, which solves the defects of low pulping efficiency, uneven mixing, low nucleation rate, poor viscosity, low solid phase rate, complex process and high cost of the semi-solid pulping process in the prior art.

The technical scheme of the invention is realized in such a way

The semi-solid pulping process based on melt mixing comprises the following steps:

s1, mixing: mixing a high-temperature alloy melt A and a low-temperature alloy melt B into an alloy mixed melt, wherein the temperature of the high-temperature alloy melt A is 70-150 ℃ above the liquidus line, the temperature of the low-temperature alloy melt B is-10 ℃ to +20 ℃ of the liquidus line, and the mass ratio of the high-temperature alloy melt A to the low-temperature alloy melt B is (1-2): 1;

s2, stirring: dividing the alloy mixed melt into two annularly flowing fluids by a stirring device, wherein the two fluids are converged and convectively collided at the junction;

s3, heat preservation: placing the stirred alloy mixed melt in a heat preservation environment for heat preservation;

s4, molding: and when the alloy mixed melt in the heat preservation environment reaches the specified solid phase rate, pouring the alloy mixed melt into a forming device to obtain a finished piece.

Further, the alloy melt a and the alloy melt B have the same or different compositions.

Further, the stirring device is a mechanical stirring device or an electromagnetic stirring device.

The invention has the beneficial effects that:

1. the temperature of the high-temperature melt A is controlled to be 70-150 ℃ above a liquidus line, so that solid-like atomic clusters in the alloy melt can be broken and become finer, and the structure of the alloy melt becomes more uniform; the temperature of the low-temperature melt B is controlled to be about minus 10 ℃ to plus 20 ℃ of the liquidus line, so that the alloy melt contains a large amount of solid-phase-like atom clusters, the high-temperature melt A and the low-temperature melt B are mixed, namely, a large amount of solid-phase-like atom clusters are added into the high-temperature uniform melt, the solid-phase-like atom clusters are fused and decomposed into finer atom clusters under the thermal action of the high-temperature melt, and the atom clusters can become nucleation cores in the solidification process, so that the nucleation number is greatly increased, and the effect of refining the structure is achieved.

2. The mass ratio of the high-temperature melt A to the low-temperature melt B is (1-2): 1, the proportion of the high-temperature melt A is properly increased, the thermal action of the melt after mixing can be enhanced, solid-phase-like atom clusters in the high-temperature melt B can be fused and decomposed more uniformly, the number of clusters which can become nucleation cores in the solidification process is increased, and the nucleation rate is increased.

3. In the mixing process of the high-temperature melt A and the low-temperature melt B, two streams of fluid which are intersected and collided are formed through a stirring device, the mixing is more uniform, and the grown crystal grains are broken into finer crystal nuclei under the action of the impact force of collision, so that the nucleation rate is further improved, and the viscosity is also better.

4. The stirred alloy mixed melt is placed in a heat-preservation environment for heat preservation and inoculation, the crystallization nucleation is more uniform, and the solid phase rate is improved.

5. The invention has the advantages of simple process steps, high pulping efficiency, uniform mixing, high nucleation rate, good viscosity, good solid phase rate and low cost.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 shows two streams of circular flow in example 1.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The semi-solid pulping process based on melt mixing comprises the following steps:

s1, mixing: mixing a high-temperature alloy melt A and a low-temperature alloy melt B into an alloy mixed melt, wherein the temperature of the high-temperature alloy melt A is 70 ℃ above the liquidus line of the high-temperature alloy melt A, the temperature of the low-temperature alloy melt B is 10 ℃ below the liquidus line of the low-temperature alloy melt A, and the mass ratio of the high-temperature alloy melt A to the low-temperature alloy melt B is 1: 1;

s2, stirring: dividing the alloy mixed melt into two annularly flowing fluids by a stirring device, wherein the two fluids are converged and convectively collided at the junction, and referring to fig. 1;

s3, heat preservation: placing the stirred alloy mixed melt in a heat preservation environment for heat preservation;

s4, molding: and when the alloy mixed melt in the heat preservation environment reaches the specified solid phase rate, pouring the alloy mixed melt into a forming device to obtain a finished piece.

Further, the alloy melt a and the alloy melt B have the same or different compositions.

Further, the stirring device is a mechanical stirring device or an electromagnetic stirring device.

Example 2

The semi-solid pulping process based on melt mixing comprises the following steps:

s1, mixing: mixing a high-temperature alloy melt A and a low-temperature alloy melt B into an alloy mixed melt, wherein the temperature of the high-temperature alloy melt A is 150 ℃ above the liquidus line, the temperature of the low-temperature alloy melt B is 20 ℃ above the liquidus line, and the mass ratio of the high-temperature alloy melt A to the low-temperature alloy melt B is 2: 1;

s2, stirring: dividing the alloy mixed melt into two annularly flowing fluids by a stirring device, wherein the two fluids are converged and convectively collided at the junction;

s3, heat preservation: placing the stirred alloy mixed melt in a heat preservation environment for heat preservation;

s4, molding: and when the alloy mixed melt in the heat preservation environment reaches the specified solid phase rate, pouring the alloy mixed melt into a forming device to obtain a finished piece.

Further, the alloy melt a and the alloy melt B have the same or different compositions.

Further, the stirring device is a mechanical stirring device or an electromagnetic stirring device.

Example 3

The semi-solid pulping process based on melt mixing comprises the following steps:

s1, mixing: mixing a high-temperature alloy melt A and a low-temperature alloy melt B into an alloy mixed melt, wherein the temperature of the high-temperature alloy melt A is 100 ℃ above the liquidus line of the high-temperature alloy melt A, the temperature of the low-temperature alloy melt B is 5 ℃ above the liquidus line of the low-temperature alloy melt B, and the mass ratio of the high-temperature alloy melt A to the low-temperature alloy melt B is 1.5: 1;

s2, stirring: dividing the alloy mixed melt into two annularly flowing fluids by a stirring device, wherein the two fluids are converged and convectively collided at the junction;

s3, heat preservation: placing the stirred alloy mixed melt in a heat preservation environment for heat preservation;

s4, molding: and when the alloy mixed melt in the heat preservation environment reaches the specified solid phase rate, pouring the alloy mixed melt into a forming device to obtain a finished piece.

Further, the alloy melt a and the alloy melt B have the same or different compositions.

Further, the stirring device is a mechanical stirring device or an electromagnetic stirring device.

Example 4

The semi-solid pulping process based on melt mixing comprises the following steps:

s1, mixing: mixing a high-temperature alloy melt A and a low-temperature alloy melt B into an alloy mixed melt, wherein the temperature of the high-temperature alloy melt A is 110 ℃ above the liquidus line of the high-temperature alloy melt A, the temperature of the low-temperature alloy melt B is 10 ℃ above the liquidus line of the low-temperature alloy melt B, and the mass ratio of the high-temperature alloy melt A to the low-temperature alloy melt B is 1.7: 1;

s2, stirring: dividing the alloy mixed melt into two annularly flowing fluids by a stirring device, wherein the two fluids are converged and convectively collided at the junction;

s3, heat preservation: placing the stirred alloy mixed melt in a heat preservation environment for heat preservation;

s4, molding: and when the alloy mixed melt in the heat preservation environment reaches the specified solid phase rate, pouring the alloy mixed melt into a forming device to obtain a finished piece.

Further, the alloy melt a and the alloy melt B have the same or different compositions.

Further, the stirring device is a mechanical stirring device or an electromagnetic stirring device.

Example 5

S1, mixing: mixing a high-temperature alloy melt A and a low-temperature alloy melt B into an alloy mixed melt, wherein the temperature of the high-temperature alloy melt A is 90 ℃ above the liquidus line, the temperature of the low-temperature alloy melt B is 5 ℃ below the liquidus line, and the mass ratio of the high-temperature alloy melt A to the low-temperature alloy melt B is 1.3: 1;

s2, stirring: dividing the alloy mixed melt into two annularly flowing fluids by a stirring device, wherein the two fluids are converged and convectively collided at the junction;

s3, heat preservation: placing the stirred alloy mixed melt in a heat preservation environment for heat preservation;

s4, molding: and when the alloy mixed melt in the heat preservation environment reaches the specified solid phase rate, pouring the alloy mixed melt into a forming device to obtain a finished piece.

Further, the alloy melt a and the alloy melt B have the same or different compositions.

Further, the stirring device is a mechanical stirring device or an electromagnetic stirring device.

The temperature of the high-temperature melt A is controlled to be 70-150 ℃ above the liquidus line, so that solid-like atomic clusters in the alloy melt are broken and become finer, and the structure of the alloy melt becomes more uniform; the temperature of the low-temperature melt B needs to be controlled to be about minus 10 ℃ to plus 20 ℃ of the liquidus line, so that the alloy melt contains a large amount of solid-phase-like atom clusters, the high-temperature melt A and the low-temperature melt B are mixed, namely, a large amount of solid-phase-like atom clusters are added into the high-temperature uniform melt, the solid-phase-like atom clusters are fused and decomposed into finer atom clusters under the thermal action of the high-temperature melt, and the finer atom clusters can become nucleation cores in the solidification process, so that the number of the nucleation cores is greatly increased, and the effect of refining the structure is achieved.

The mass ratio of the high-temperature melt A to the low-temperature melt B is (1-2): 1, the proportion of the high-temperature melt A is properly increased, the thermal action of the melt after mixing can be enhanced, solid-phase-like atom clusters in the high-temperature melt B can be fused and decomposed more uniformly, the number of clusters which can become nucleation cores in the solidification process is increased, and the nucleation rate is increased.

In the mixing process of the high-temperature melt A and the low-temperature melt B, two streams of fluid which are intersected and collided are formed through a stirring device, the mixing is more uniform, and the grown crystal grains are broken into finer crystal nuclei under the action of the impact force of collision, so that the nucleation rate is further improved, and the viscosity is also better.

The stirred alloy mixed melt is placed in a heat-preservation environment for heat preservation and inoculation, the crystallization nucleation is more uniform, and the solid phase rate is improved.

The invention has the advantages of simple process steps, high pulping efficiency, uniform mixing, high nucleation rate, good viscosity, good solid phase rate and low cost.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.