CN113579203A - Micro-solid forming process and device - Google Patents
Micro-solid forming process and device Download PDFInfo
- Publication number
- CN113579203A CN113579203A CN202110637134.4A CN202110637134A CN113579203A CN 113579203 A CN113579203 A CN 113579203A CN 202110637134 A CN202110637134 A CN 202110637134A CN 113579203 A CN113579203 A CN 113579203A
- Authority
- CN
- China
- Prior art keywords
- molten metal
- temperature
- micro
- liquid
- solid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention relates to a micro-solid forming process and a device, which comprises the following steps of 1) utilizing pressure to make molten metal flow from a heat preservation furnace to a model cavity through an intermediate pipeline; step 2) controlling the temperature of the pipe wall of the middle pipeline, and enabling part of molten metal to generate a solid phase along the pipe wall and grow solidified dendritic crystals as the temperature of the pipe wall is lower than the liquidus of the metal; step 3) breaking, thinning and dispersing the grown solidified dendrites in the metal liquid to form nucleation cores, wherein the nucleation cores after breaking, thinning and dispersing distribution enable the metal liquid to be in a micro-solid state with high fluidity; and 4) pouring the micro-solid metal liquid into a mold cavity for molding. The invention has the advantages of both liquid state and semi-solid state, can form castings with complex structures, can improve the quality of the castings to a certain extent, improve the process yield, save the consumption of raw materials, and has flexible temperature regulation and wide application range.
Description
Technical Field
The invention relates to the technical field of metal casting, in particular to a micro-solid forming process and a micro-solid forming device.
Background
At present, casting is classified into liquid casting and semi-solid casting according to the state of liquid metal.
The liquid metal is completely liquid at a temperature above the liquid phase, has good fluidity, is easy to form a complex structure, is a traditional casting mode, and has the defects that the gas content of the liquid metal is relatively high, and air holes and air shrinkage holes are easily formed on a casting; in the solidification process, the liquid state is converted into the solid state, the material shrinks, shrinkage porosity and shrinkage cavity are easy to form, or extra material is needed for feeding, so that the process yield of the product is low; the solidification speed is slow, crystal grains are easy to grow up, the structure is large, and the mechanical property is reduced.
Semi-solid casting, namely metal semi-solid forming, means that materials can be carried like solid metal in the process of metal phase transformation from solid to liquid or from liquid to solid; the material has certain rheological property, and certain pressure is applied to form a required structure; the method has the advantages of high solidification and cooling speed, fine crystal grains, less tissue defects, small shrinkage rate, easy realization of near-net shape forming and relatively high mechanical property of a product; the method has the disadvantages that the fluidity is poor, a complex casting with an inner cavity structure is difficult to form, and the required pressure is high during molding, generally dozens of megapascals are required, so the equipment cost investment is high.
In summary, the current liquid casting and semi-solid casting have advantages, but have disadvantages, which are difficult to solve.
Aiming at the problems, the invention provides a micro-solid forming process and a micro-solid forming device, so that metal is in a molten metal state between a liquid state and a semi-solid state, the molten metal is subjected to process treatment, a nucleation core in the molten metal is increased, the good fluidity is ensured, the gas content in the molten metal is reduced, grains are refined, the structure is improved, the heat conduction to a cavity is reduced, the thermal deformation of a sand mold and a sand core is reduced, the size precision of a casting is improved, and the feeding amount is reduced.
Disclosure of Invention
The invention aims to overcome the problems in the prior art, and provides a micro-solid forming process and a micro-solid forming device, which have the advantages of liquid state and semi-solid state, can form castings with complex structures, improve the quality of the castings to a certain extent, improve the process yield, save the consumption of raw materials, and realize digital and intelligent control.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
a micro-solid state molding process, comprising the steps of:
step 1) utilizing pressure to enable molten metal to flow from a heat preservation furnace to a model cavity through an intermediate pipeline;
step 2) controlling the pipe wall temperature of the intermediate pipeline so as to:
the temperature of the molten metal close to the central part of the middle pipeline is higher than the liquidus temperature of the molten metal, so that the molten metal is maintained in a liquid phase;
the temperature of the metal liquid close to the pipe wall part of the middle pipeline is lower than the liquidus temperature of the metal liquid, so that the metal liquid generates a solid phase and solidified dendritic crystals grow;
step 3) arranging a stirring device around the intermediate pipeline, stirring the molten metal in the molten metal when the molten metal flows through the intermediate pipeline, so that the grown solidified dendritic crystals are broken, refined and dispersed in the molten metal to form nucleation cores when the molten metal is solidified, and the nucleation cores after refining and dispersion distribution enable the molten metal to be in a micro-solid state with high fluidity;
and 4) continuously applying pressure to the micro-solid metal liquid to enable the metal liquid to flow into a mold cavity, stopping a gate of the mold cavity after the mold cavity is filled, finishing the pouring process, and removing the poured casting to prepare for pouring of the next mold.
Furthermore, the middle pipeline is a liquid lifting pipe, and the molten metal in the heat preservation furnace stably flows to the mold cavity from bottom to top through the liquid lifting pipe under the action of pressure.
Further, the temperature of the pipe wall of the intermediate pipeline and the temperature of the metal liquid in the heat preservation furnace are controlled, after stirring, the temperature range of the metal liquid is divided and controlled to seven levels of L0-L7 before entering a mold cavity, and an interval temperature delta t below a metal liquid phase line is used0At a minimum temperature level L0, with each additional interval temperature Δ t0In one grade, up to the L7 grade, each grade temperature corresponds to a different solid fraction and fluidity.
Further, the stirring device is an electromagnetic stirring device, and is used for rotationally stirring the molten metal in a manner of not contacting with the molten metal.
A micro-solid forming device comprises a heat preservation furnace, a liquid lifting pipe and a model cavity, wherein one end of the liquid lifting pipe is introduced into the heat preservation furnace, and the other end of the liquid lifting pipe is communicated to the bottom of the model cavity.
Furthermore, the top of the heat preservation furnace is provided with a furnace cover and a corresponding pressurizing opening, so that a sealed cavity is formed inside the heat preservation furnace, pressure is applied conveniently, and the lift pipe penetrates through the furnace cover from the top and is led into the heat preservation furnace.
Furthermore, an electromagnetic stirring device is arranged on the periphery of the lift pipe and used for stirring the molten metal flowing through the lift pipe in a non-contact manner.
Furthermore, the electromagnetic stirring device is arranged on the periphery of the riser pipe at the exposed part between the holding furnace and the mold cavity.
The invention has the beneficial effects that:
the invention makes the metal in the liquid state and the semi-solid state, carries out process treatment on the metal liquid, increases the nucleation core in the metal liquid, reduces the gas content in the metal liquid, refines crystal grains, improves the structure, reduces the heat conduction to a cavity, reduces the thermal deformation of a sand mold and a sand core, improves the dimensional precision of the casting, reduces the feeding amount, has the advantages of both liquid state and semi-solid state, can form a casting with a complex structure, can improve the quality of the casting to a certain extent, improves the process yield, saves the consumption of raw materials, and realizes digital and intelligent control.
Drawings
FIG. 1 is a block diagram of a micro-solid molding apparatus according to the present invention;
FIG. 2 is a schematic view showing the temperature distribution of molten metal in the intermediate pipe;
FIG. 3 is a schematic diagram illustrating the difference between the pouring temperature range of the micro-solid forming process of the present invention, which takes aluminum alloy liquid as an example, and the conventional casting and semi-solid casting;
FIG. 4 is a graph of dendrite growth in the intermediate pipe under normal conditions;
FIG. 5 is a diagram showing the growth of the dendrites after being broken up under stirring conditions according to the present invention.
The reference numbers in the figures illustrate: 1. the device comprises a heat preservation furnace 2, a liquid lifting pipe 3, a model cavity 4, a furnace cover 5, an electromagnetic stirring device 6 and a gate mechanism.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
A micro-solid state molding process, comprising the steps of:
step 1) utilizing pressure to enable molten metal to flow from a heat preservation furnace to a model cavity through an intermediate pipeline;
step 2) controlling the pipe wall temperature of the intermediate pipeline so as to:
as shown in FIG. 3, taking the aluminum alloy liquid as an example, when the temperature of the aluminum alloy liquid is controlled, the temperature Δ T is controlled1At the traditional casting temperature and the semi-solid temperature delta T2Taking this temperature interval as the micro-solid temperature DeltaT1And the micro-solid temperature Delta T of the aluminum alloy liquid according to the change of the components of the elements1Correspondingly adjusting to meet the following temperature control principle, wherein the temperature of the metal liquid close to the central part of the middle pipeline is higher than the liquidus temperature of the metal liquid, and the metal liquid is maintained in a liquid phase;
the temperature of the molten metal near the pipe wall of the intermediate pipe is lower than the liquidus temperature thereof, so that the molten metal is in a solid phase, as shown in fig. 4, a solidified dendrite is grown, and in this embodiment, the temperature of the molten metal is lower than the liquidus temperature T thereof within a certain distance in the intermediate pipe which is closer to the pipe wall0；
Step 3) arranging a stirring device around the middle pipeline, stirring the molten metal in the molten metal when the molten metal flows through the middle pipeline, so that the grown solidified dendritic crystals are broken, refined and dispersed in the molten metal to form nucleation cores when the molten metal is solidified as shown in fig. 5, and the refined and dispersed nucleation cores enable the molten metal to be in a micro-solid state with high fluidity;
and 4) continuously applying pressure to the micro-solid metal liquid to enable the metal liquid to flow into a mold cavity, stopping a gate of the mold cavity after the mold cavity is filled, finishing the pouring process, and removing the poured casting to prepare for pouring of the next mold.
The middle pipeline is a liquid lifting pipe, and the molten metal in the heat preservation furnace stably flows to the mold cavity from bottom to top through the liquid lifting pipe under the action of pressure.
The pipe wall temperature of the intermediate pipeline and the temperature of the metal liquid in the heat preservation furnace are controlled, in the embodiment, taking aluminum alloy as an example, after stirring, before entering a model cavity, the temperature of the aluminum liquid can be controlled to seven levels of L0-L7, the temperature below the liquidus line of the aluminum liquid is 5 ℃ as the lowest temperature level L0, and one level is added when the temperature is increased by 5 ℃ until the temperature of L6 level is L6 level, each level of temperature corresponds to different solid fraction and fluidity, the lower the temperature, the higher the solid content, the better the casting structure and mechanical property, but the poor fluidity, and is not beneficial to forming complex castings, so that different levels can be selected according to the complexity and performance requirements of the casting structure, thereby realizing the forming of complex and thin-walled castings, the principle of selecting the temperature is that when the casting structure is relatively complex, the pouring temperature is relatively higher, and when the requirements on the structure and performance are higher, the selective casting temperature is relatively low, and the adaptability is very wide.
The stirring device is an electromagnetic stirring device and is used for rotationally stirring the molten metal in a mode of not contacting with the molten metal.
As shown in figure 1, the micro solid forming device comprises a heat preservation furnace 1, a liquid lifting pipe 2 and a model cavity 3, wherein one end of the liquid lifting pipe 2 is introduced into the heat preservation furnace 1, and the other end of the liquid lifting pipe is communicated to the bottom of the model cavity 3.
The top of the heat preservation furnace 1 is provided with a furnace cover 4 and a corresponding pressurizing opening, so that a sealed cavity is formed inside the heat preservation furnace 1 to apply pressure, and the lift pipe 2 penetrates through the furnace cover 4 from the top and is led into the heat preservation furnace 1.
The periphery of the lift tube 2 is provided with an electromagnetic stirring device 5 for contactless stirring of the molten metal flowing through the lift tube 2.
The electromagnetic stirring device 5 is arranged on the periphery of the riser pipe 2 at the exposed part between the holding furnace 1 and the model cavity 3, and in the embodiment, a gate mechanism 6 is further arranged on one side of the riser pipe 2 to control the opening and closing of the riser pipe 2, so that when pouring is completed, the gate mechanism is gated at a pouring gate.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A micro-solid state molding process is characterized by comprising the following steps:
step 1) utilizing pressure to enable molten metal to flow from a heat preservation furnace to a model cavity through an intermediate pipeline;
step 2) controlling the pipe wall temperature of the intermediate pipeline so as to:
the temperature of the molten metal close to the central part of the middle pipeline is higher than the liquidus temperature of the molten metal, so that the molten metal is maintained in a liquid phase;
the temperature of the metal liquid close to the pipe wall part of the middle pipeline is lower than the liquidus temperature of the metal liquid, so that the metal liquid generates a solid phase and solidified dendritic crystals grow;
step 3) arranging a stirring device around the intermediate pipeline, stirring the molten metal in the molten metal when the molten metal flows through the intermediate pipeline, so that the grown solidified dendritic crystals are broken, refined and dispersed in the molten metal to form nucleation cores when the molten metal is solidified, and the nucleation cores after refining and dispersion distribution enable the molten metal to be in a micro-solid state with high fluidity;
and 4) continuously applying pressure to the micro-solid metal liquid to enable the metal liquid to flow into a mold cavity, stopping a gate of the mold cavity after the mold cavity is filled, finishing the pouring process, and removing the poured casting to prepare for pouring of the next mold.
2. The micro solid state molding process of claim 1, wherein the intermediate pipeline is a lift pipe, and the molten metal in the holding furnace flows from bottom to top to the mold cavity through the lift pipe under the action of pressure.
3. The micro solid state forming process of claim 1, wherein the temperature of the pipe wall of the intermediate pipe and the temperature of the molten metal in the holding furnace are controlled, after stirring, the temperature of the molten metal is divided and controlled to seven levels of L0-L7 before entering the mold cavity, and the temperature Δ t is an interval temperature below the molten metal phase line0At a minimum temperature level L0, with each additional interval temperature Δ t0In one grade, up to the L7 grade, each grade temperature corresponds to a different solid fraction and fluidity.
4. The micro solid state forming process of claim 1, wherein the stirring device is an electromagnetic stirring device, and the molten metal is stirred in a rotating manner without contacting with the molten metal.
5. A micro-solid forming device is characterized by comprising a heat preservation furnace, a liquid lifting pipe and a model cavity, wherein one end of the liquid lifting pipe is communicated with the heat preservation furnace, and the other end of the liquid lifting pipe is communicated to the bottom of the model cavity.
6. The apparatus according to claim 5, wherein the holding furnace is provided with a furnace cover and a corresponding pressurizing port at the top thereof, so that a sealed cavity is formed inside the holding furnace to facilitate the application of pressure, and the lift pipe passes through the furnace cover from the top into the holding furnace.
7. A micro-solid forming device according to claim 6, wherein the riser tube is provided at its periphery with an electromagnetic stirring device for non-contact stirring of the molten metal flowing through the riser tube.
8. The apparatus of claim 7, wherein the electromagnetic stirring device is disposed at the periphery of the lift tube at the exposed portion between the holding furnace and the mold cavity.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110637134.4A CN113579203A (en) | 2021-06-08 | 2021-06-08 | Micro-solid forming process and device |
| PCT/CN2021/137370 WO2022257400A1 (en) | 2021-06-08 | 2021-12-13 | Micro-solid-state molding method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110637134.4A CN113579203A (en) | 2021-06-08 | 2021-06-08 | Micro-solid forming process and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113579203A true CN113579203A (en) | 2021-11-02 |
Family
ID=78243498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110637134.4A Pending CN113579203A (en) | 2021-06-08 | 2021-06-08 | Micro-solid forming process and device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN113579203A (en) |
| WO (1) | WO2022257400A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022257400A1 (en) * | 2021-06-08 | 2022-12-15 | 苏州明志科技股份有限公司 | Micro-solid-state molding method and apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120023310B (en) * | 2025-04-24 | 2025-07-25 | 宁波豪若汽车零部件制造有限公司 | An automatic die-casting device and die-casting method for an aluminum shell of an automobile liquid storage dryer |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08257722A (en) * | 1995-03-22 | 1996-10-08 | Hitachi Metals Ltd | Casting method by die casting |
| CN1772414A (en) * | 2004-11-10 | 2006-05-17 | 北京有色金属研究总院 | A method for continuously preparing semi-solid metal slurry by applying compound electromagnetic stirring |
| CN101032739A (en) * | 2006-03-08 | 2007-09-12 | 西北工业大学 | Method for producing semi-solid state sizing agent for founding and the producing device |
| CN105583396A (en) * | 2016-03-16 | 2016-05-18 | 沈阳铸造研究所 | Low-pressure casting one-step method for manufacturing semi-solid light alloy castings |
| CN110831713A (en) * | 2019-07-05 | 2020-02-21 | 苏州明志科技股份有限公司 | Low-pressure mold filling method and device adopting electromagnetic stirring technology |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4580616A (en) * | 1982-12-06 | 1986-04-08 | Techmet Corporation | Method and apparatus for controlled solidification of metals |
| US5730198A (en) * | 1995-06-06 | 1998-03-24 | Reynolds Metals Company | Method of forming product having globular microstructure |
| US20050126737A1 (en) * | 2003-12-04 | 2005-06-16 | Yurko James A. | Process for casting a semi-solid metal alloy |
| KR20050072582A (en) * | 2004-01-07 | 2005-07-12 | 한 중 이 | Method and apparatus for manufacturing forming material with spherical structure |
| CN112828264B (en) * | 2020-12-31 | 2022-03-08 | 上海大学 | Casting device with spiral magnetic field and casting method |
| CN113579203A (en) * | 2021-06-08 | 2021-11-02 | 苏州明志科技股份有限公司 | Micro-solid forming process and device |
-
2021
- 2021-06-08 CN CN202110637134.4A patent/CN113579203A/en active Pending
- 2021-12-13 WO PCT/CN2021/137370 patent/WO2022257400A1/en not_active Ceased
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08257722A (en) * | 1995-03-22 | 1996-10-08 | Hitachi Metals Ltd | Casting method by die casting |
| CN1772414A (en) * | 2004-11-10 | 2006-05-17 | 北京有色金属研究总院 | A method for continuously preparing semi-solid metal slurry by applying compound electromagnetic stirring |
| CN101032739A (en) * | 2006-03-08 | 2007-09-12 | 西北工业大学 | Method for producing semi-solid state sizing agent for founding and the producing device |
| CN105583396A (en) * | 2016-03-16 | 2016-05-18 | 沈阳铸造研究所 | Low-pressure casting one-step method for manufacturing semi-solid light alloy castings |
| CN110831713A (en) * | 2019-07-05 | 2020-02-21 | 苏州明志科技股份有限公司 | Low-pressure mold filling method and device adopting electromagnetic stirring technology |
Non-Patent Citations (1)
| Title |
|---|
| 沙明红 等著, 《金属材料凝固原理与技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022257400A1 (en) * | 2021-06-08 | 2022-12-15 | 苏州明志科技股份有限公司 | Micro-solid-state molding method and apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022257400A1 (en) | 2022-12-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112317692B (en) | A casting system for casting alloy standard samples and a method for manufacturing a mold shell | |
| CN105583396B (en) | A kind of low pressure casting one-step method for manufacturing semi-solid light alloy casting | |
| CN115007839B (en) | A semi-solid rheomorphic low-pressure casting method | |
| KR100526096B1 (en) | Apparatus for producing a semi-solid metallic slurry | |
| CN111057890B (en) | High-purity purification and high-homogenization casting method for magnesium alloy and magnesium-lithium alloy | |
| CN105598372A (en) | Aluminum alloy investment casting method and investment casting device adopting near liquidus pouring | |
| CN101569927B (en) | System for casting and pouring propeller of ship | |
| CN105772654A (en) | Stirring and mixing method for solid-liquid metal | |
| CN105817610B (en) | A kind of casting mould for metal castings | |
| US5135564A (en) | Method and apparatus for the production of semi-solidified metal composition | |
| CN113579203A (en) | Micro-solid forming process and device | |
| CN100337772C (en) | Composite electromagnetic stirring process of preparing semi-solid metal slurry continuously | |
| CN110831713A (en) | Low-pressure mold filling method and device adopting electromagnetic stirring technology | |
| KR200319469Y1 (en) | Die-casting apparatus for rheocasting method | |
| CN108262455A (en) | A kind of integrated reho-forming method for manufacturing high-quality semi-solid light alloy casting | |
| CN110062671B (en) | Casting methods for reactive metals | |
| CN101596590B (en) | Method for inhibiting large steel ingot from macrosegregation by mechanical stirring | |
| CN107150109B (en) | Method and device for bidirectionally cooling and dynamically pouring composite ingot | |
| US10675676B2 (en) | Process for preparing molten metals for casting at a low to zero superheat temperature | |
| CN205309238U (en) | Novel semi -solid magnesium alloy slurrying device | |
| CN101007343A (en) | Preparation method of semisolid alloy slurry and molding device | |
| CN102350485A (en) | Device and process for repairing shrinkage holes during steel billet casting through intermediate-frequency electric heating | |
| CN203737962U (en) | Refining device for metal solidification structure | |
| CN207823875U (en) | A kind of metal mold aluminium casting tensile sample mold | |
| CN205309251U (en) | Semi -solid magnesium alloy slurrying device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |