CN114535558B - Control device and method for liquid flow during starting of magnesium alloy semi-continuous casting - Google Patents
Control device and method for liquid flow during starting of magnesium alloy semi-continuous casting Download PDFInfo
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- CN114535558B CN114535558B CN202210232448.0A CN202210232448A CN114535558B CN 114535558 B CN114535558 B CN 114535558B CN 202210232448 A CN202210232448 A CN 202210232448A CN 114535558 B CN114535558 B CN 114535558B
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- 239000007788 liquid Substances 0.000 title claims abstract description 97
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 45
- 238000009749 continuous casting Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000010935 stainless steel Substances 0.000 claims abstract description 88
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 88
- 238000004321 preservation Methods 0.000 claims description 15
- 238000005266 casting Methods 0.000 claims description 8
- 238000010079 rubber tapping Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 239000007921 spray Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Abstract
The invention discloses a control device and a control method for liquid flow during starting of magnesium alloy semi-continuous casting, wherein the control device comprises a stainless steel runner, a runner lower end and a lower end towing bar; the upper end of the stainless steel runner is connected with the front liquid box control valve in a matched mode, the lower end of the runner is detachably connected with the lower end of the stainless steel runner, one end, far away from the stainless steel runner, of the lower end of the runner is of a conical structure, and the lower end of the lower end pull rod is used for moving the lower end of the runner in a high-temperature state to be connected with the stainless steel runner in the high-temperature state. The invention not only solves the problem of blockage of the stainless steel runner, but also is convenient to operate.
Description
Technical Field
The invention belongs to the field of magnesium alloy production, and particularly relates to a device and a method for controlling liquid flow during starting of magnesium alloy semi-continuous casting.
Background
The semi-continuous casting production process is widely applied in the field of magnesium alloy production, and the starting stage is an important ring in the semi-continuous casting production, so that smooth progress of the semi-continuous casting production is determined. The liquid flow control in the starting stage is mainly at the position of the heat-preserving front liquid tank. The heat-preserving front liquid tank is a device for preserving heat of the magnesium alloy liquid before the magnesium alloy liquid enters the crystallizer. The main factors affecting the level of liquid in the crystallizer are the drawing speed of the casting machine and the flow rate of liquid at the control valve of the liquid tank before heat preservation. When semi-continuous casting production is just started, the casting machine is in a static state, and the flow rate of liquid at the control valve of the liquid tank before heat preservation seriously influences the starting stage of semi-continuous casting. Because the control valve of the liquid tank and the crystallizer have a certain height before heat preservation, a stainless steel pipe is used as a flow passage of magnesium alloy liquid. Because the inner diameter of the stainless steel pipe is small, and the magnesium alloy liquid can be severely cooled in the flowing process, the liquid is blocked in the stainless steel flow channel. Currently, a common solution is to flame heat the stainless steel runner using a flame gun before the start of casting to raise the temperature of the stainless steel runner. However, due to the difference between the flame area of the flame spray gun and the area of the stainless steel runner, the flame spray gun needs to reciprocate, so that the stainless steel runner is heated unevenly and the flame spray gun needs to be stopped in advance during starting casting, the problem of runner blockage is still serious, and the operation is inconvenient. The casting starting stage is unstable, and the failure of starting the casting starting stage is easy to cause the influence on the whole casting process.
Disclosure of Invention
The invention aims to provide a control device and a control method for liquid flow during starting of magnesium alloy semi-continuous casting, so as to solve the problem of blockage of a stainless steel runner during starting of the semi-continuous casting.
In order to achieve the above purpose, the invention adopts the following technical scheme:
A control device for liquid flow during starting of magnesium alloy semi-continuous casting comprises a stainless steel runner, a runner lower end and a lower end towing bar; the upper end of the stainless steel runner is connected with the front liquid box control valve in a matched mode, the lower end of the runner is detachably connected with the lower end of the stainless steel runner, one end, far away from the stainless steel runner, of the lower end of the runner is of a conical structure, and the lower end of the lower end pull rod is used for moving the lower end of the runner in a high-temperature state to be connected with the stainless steel runner in the high-temperature state.
Further, the inner diameter of the stainless steel runner is 40mm.
Further, the inner diameter of the lower end of the conical structure is 20mm.
A control method of liquid flow during starting of magnesium alloy semi-continuous casting comprises the following steps:
Step one: placing the stainless steel runner and the lower end of the runner into a high-temperature furnace for heat preservation to obtain the stainless steel runner and the lower end of the runner in a high-temperature state;
Step two: the stainless steel runner in a high temperature state is arranged at a front liquid box control valve to form a pre-liquid-discharging heat-preserving front liquid box;
step three: placing the lower end of the runner in a high temperature state on a lower end pull rod to form a pre-placed runner lower end;
Step four: opening a control valve of the pre-tapping heat-preserving front liquid tank to enable magnesium alloy liquid to flow through the stainless steel runner, so as to obtain the stainless steel runner through which the liquid can flow, wherein the stainless steel runner can be arranged at the lower end of the runner;
step five: and installing the lower end of the pre-placed runner on a stainless steel runner through which liquid flows, so as to control liquid flow during starting of magnesium alloy semi-continuous casting.
Further, in the first step, the inner diameter of the stainless steel runner is 40mm, the lower end of the runner is of a conical structure, and the inner diameter of the lower end of the conical structure is 20mm.
Further, in the first step, the heat preservation temperature of the lower end of the stainless steel runner in the high-temperature furnace is 550-750 ℃ and the heat preservation time is 30-60min;
The temperature of the stainless steel runner and the lower end of the runner in the high temperature state in the first step is 550-750 ℃.
Further, the temperature of the stainless steel runner of the pre-tapping heat-preserving front liquid box in the second step is 450-750 ℃.
Further, the temperature of the lower end of the pre-placed runner in the third step is 400-750 ℃.
Further, in the fourth step, the time for the magnesium alloy liquid to flow through the stainless steel runner is more than 3s.
Further, in the fifth step, the flow rate of the liquid is reduced to 1/3 of the steady flow rate before the lower end of the pre-placed flow channel is installed.
Compared with the prior art, the invention has the following beneficial technical effects:
The invention adopts the stainless steel runner with large-size inner diameter to increase the metal liquid entering the runner, thereby increasing the heat in the runner, reducing the temperature reduction phenomenon of the metal liquid caused by the difference of the temperature of the runner and the metal liquid, and ensuring the temperature of the metal liquid entering the runner to be above the liquidus line; and the large-size inner diameter runner is preheated in the furnace in advance, so that the runner is heated uniformly and has controllable temperature, and the heat transfer phenomenon of the molten metal to the runner is greatly reduced. In summary, the metal liquid can be smoothly drained to the crystallizer by increasing the heat in the flow channel and reducing the heat absorption of the flow channel, so that the metal liquid is not easy to cause blockage, and the process is simple and the operation is convenient; after the magnesium alloy liquid flows through the stainless steel runner, the flow speed of the liquid is reduced to 1/3, and the lower end of the runner is arranged at the lower end of the stainless steel runner so as to control the flow speed of the magnesium alloy liquid and stabilize the starting stage of semi-continuous casting.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural diagram of a control device for controlling liquid flow during starting of magnesium alloy semi-continuous casting.
Wherein, 1, stainless steel runner; 2. the lower end of the runner; 3. a lower end pull rod.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one side", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Various structural schematic diagrams according to the disclosed embodiments of the present invention are shown in the accompanying drawings. The figures are not drawn to scale, wherein certain details are exaggerated for clarity of presentation and may have been omitted. The shapes of the various regions, layers and their relative sizes, positional relationships shown in the drawings are merely exemplary, may in practice deviate due to manufacturing tolerances or technical limitations, and one skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions as actually required.
In the semi-continuous casting production of magnesium alloy, in order to control the flow rate of magnesium alloy liquid, a stainless steel runner with smaller inner diameter is generally selected, and the small inner diameter size easily causes the blockage of the magnesium alloy liquid. If the flow passage is heated by using the flame spray gun, the operation is troublesome and the desired effect cannot be achieved.
Therefore, the invention provides a control device for liquid flow during starting of magnesium alloy semi-continuous casting, which comprises a stainless steel runner 1, a runner lower end 2 and a lower end towing bar 3; the inner diameter of the stainless steel runner 1 is 40mm (the inner diameter of the stainless steel runner is 20mm in the market), and the upper end of the stainless steel runner is matched with a front liquid tank control valve; the lower end 2 of the flow passage is of a conical structure, can be freely separated from the stainless steel flow passage 1, and the inner diameter of the lower end of the conical structure is 20mm; the purpose of the lower end drag lever 3 is to freely move the lower end 2 of the flow channel in a high temperature state, and the device is shown in figure 1.
A control method of liquid flow during starting of magnesium alloy semi-continuous casting comprises the following steps:
Step one: placing a stainless steel runner 1 with the inner diameter of 40mm and a conical runner lower end 2 with the lower end inner diameter of 20mm into a high-temperature furnace with the temperature of 550-750 ℃, and preserving heat for 30-60min to obtain a stainless steel runner 1 and a runner lower end 2 with the temperature of 550-750 ℃ in a high-temperature state;
step two: installing a stainless steel runner 1 at a high temperature of 450-750 ℃ at a front liquid box control valve to obtain a pre-liquid-discharging heat-preserving front liquid box;
step three: placing the lower end 2 of the runner at the high temperature of 400-750 ℃ on a lower end pull rod 3 to obtain a pre-placed lower end of the runner;
Step four: opening a pre-tapping heat-preserving front liquid box control valve to enable magnesium alloy liquid to flow through the stainless steel runner 1, and obtaining the stainless steel runner through which the liquid flows when the time for the magnesium alloy liquid to flow through the lower end of the stainless steel runner 1 exceeds 3 s;
Step five: and after the flow rate of the magnesium alloy liquid is reduced to 1/3 by controlling the valve, the lower end of the pre-placed runner is arranged on the stainless steel runner through which the liquid flows.
The invention is described in detail below in connection with specific examples:
example 1
Step one: placing a stainless steel runner with the inner diameter of 40mm and the lower end of a conical runner with the inner diameter of 20mm into a high-temperature furnace with the temperature of 550 ℃, and preserving heat for 30min to obtain a stainless steel runner and the lower end of the runner with the temperature of 550 ℃ in a high-temperature state;
Step two: installing a stainless steel runner at a high temperature of 450 ℃ at a control valve of the pre-liquid-discharge heat-preservation front liquid tank to obtain a pre-liquid-discharge heat-preservation front liquid tank;
Step three: placing the lower end of the runner at the high temperature of 450 ℃ on a lower end pull rod to obtain the lower end of the pre-installation runner;
Step four: opening a control valve of the pre-tapping heat-preserving front liquid box to enable magnesium alloy liquid to flow through the stainless steel runner, and obtaining the stainless steel runner through which the liquid flows when the magnesium alloy liquid flows through the lower end of the stainless steel runner for 3 s;
step five: and (3) reducing the flow rate of the magnesium alloy liquid to 1/3, and then installing the lower end of the pre-placed runner on a stainless steel runner through which the liquid flows.
Example 2
Step one: placing a stainless steel runner with the inner diameter of 40mm and the lower end of a conical runner with the inner diameter of 20mm into a high-temperature furnace with the temperature of 750 ℃, and preserving heat for 60min to obtain a stainless steel runner and the lower end of the runner with the temperature of 650 ℃;
Step two: installing a stainless steel runner at 700 ℃ in a high-temperature state at a control valve of a pre-liquid-discharge heat-preservation pre-liquid tank to obtain a pre-liquid-discharge heat-preservation pre-liquid tank;
Step three: placing the lower end of the runner at the high temperature of 700 ℃ on a lower end pull rod to obtain the lower end of the pre-installation runner;
step four: opening a control valve of the pre-tapping heat-preserving front liquid box to enable magnesium alloy liquid to flow through the stainless steel runner, and obtaining the stainless steel runner through which the liquid flows when the magnesium alloy liquid flows through the lower end of the stainless steel runner for 5 seconds;
step five: and (3) reducing the flow rate of the magnesium alloy liquid to 1/3, and then installing the lower end of the pre-placed runner on a stainless steel runner through which the liquid flows.
Example 3
Step one: placing a stainless steel runner with the inner diameter of 40mm and the lower end of a conical runner with the inner diameter of 20mm into a high-temperature furnace with the temperature of 680 ℃, and preserving heat for 45min to obtain a stainless steel runner and the lower end of the runner with the temperature of 680 ℃;
Step two: installing a stainless steel runner at a high temperature of 630 ℃ at a control valve of a pre-liquid-discharge heat-preservation pre-liquid tank to obtain a pre-liquid-discharge heat-preservation pre-liquid tank;
step three: placing the lower end of the runner at the high temperature of 630 ℃ on a lower end pull rod to obtain the lower end of the pre-installation runner;
step four: opening a control valve of the pre-tapping heat-preserving front liquid box to enable magnesium alloy liquid to flow through the stainless steel runner, and obtaining the stainless steel runner through which the liquid flows when the magnesium alloy liquid flows through the lower end of the stainless steel runner for 5 seconds;
step five: and (3) reducing the flow rate of the magnesium alloy liquid to 1/3, and then installing the lower end of the pre-placed runner on a stainless steel runner through which the liquid flows.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (6)
1. The control device for the liquid flow during starting of the magnesium alloy semi-continuous casting is characterized by comprising a stainless steel runner (1), a runner lower end (2) and a lower end pull rod (3); the upper end of the stainless steel runner (1) is connected with a front liquid box control valve in a matched mode, the lower end (2) of the runner is detachably connected with the lower end of the stainless steel runner (1), one end, far away from the stainless steel runner (1), of the lower end (2) of the runner is of a conical structure, and the lower end pull rod (3) is used for moving the lower end (2) of the runner in a high-temperature state to be connected with the stainless steel runner (1) in the high-temperature state; the inner diameter of the stainless steel runner (1) is 40mm; the inner diameter of the lower end of the conical structure is 20mm.
2. A control method of liquid flow during starting of magnesium alloy semi-continuous casting based on the control device of claim 1, characterized by comprising the following steps:
Step one: placing the stainless steel runner (1) and the runner lower end (2) into a high-temperature furnace for heat preservation to obtain the stainless steel runner (1) and the runner lower end (2) in a high-temperature state; the inner diameter of the stainless steel runner (1) is 40mm, the lower end (2) of the runner is of a conical structure, and the inner diameter of the lower end of the conical structure is 20mm;
step two: the stainless steel runner (1) in a high temperature state is arranged at a front liquid box control valve to form a pre-liquid-discharging heat-preserving front liquid box;
Step three: placing the lower end (2) of the runner in a high temperature state on a lower end pull rod (3) to form a pre-placed runner lower end;
step four: opening a control valve of the pre-tapping heat-preserving front liquid tank to enable magnesium alloy liquid to flow through the stainless steel runner (1) so as to obtain the stainless steel runner through which the liquid can flow, wherein the stainless steel runner can be arranged at the lower end of the runner;
step five: the lower end of the pre-placed runner is arranged on a stainless steel runner through which liquid flows, so that liquid flow control during starting of magnesium alloy semi-continuous casting is completed; the liquid flow rate was reduced to 1/3 of the steady flow rate before the lower end of the pre-placed flow channel was installed.
3. The method for controlling liquid flow during starting of magnesium alloy semi-continuous casting according to claim 2, wherein in the first step, the heat preservation temperature of the stainless steel runner (1) and the lower end (2) of the runner in a high-temperature furnace is 550-750 ℃ and the heat preservation time is 30-60min;
The temperature of the stainless steel runner (1) and the lower end (2) of the runner in the high-temperature state in the first step is 550-750 ℃.
4. The method for controlling liquid flow during starting of magnesium alloy semicontinuous casting according to claim 2, wherein the temperature of the stainless steel runner of the pre-tapping heat-preserving front liquid tank in the second step is 450-750 ℃.
5. The method for controlling liquid flow during starting of magnesium alloy semi-continuous casting according to claim 2, wherein the temperature of the lower end of the pre-placed runner in the third step is 400-750 ℃.
6. The method for controlling liquid flow during starting of magnesium alloy semi-continuous casting according to claim 2, wherein the time for the magnesium alloy liquid to flow through the stainless steel runner in the fourth step is more than 3s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210232448.0A CN114535558B (en) | 2022-03-09 | Control device and method for liquid flow during starting of magnesium alloy semi-continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210232448.0A CN114535558B (en) | 2022-03-09 | Control device and method for liquid flow during starting of magnesium alloy semi-continuous casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114535558A CN114535558A (en) | 2022-05-27 |
| CN114535558B true CN114535558B (en) | 2024-06-07 |
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|---|---|---|---|---|
| JP2004066302A (en) * | 2002-08-07 | 2004-03-04 | Tadamasa Fujimura | Manufacturing apparatus of magnesium alloy material, manufacturing method of magnesium alloy material, and magnesium alloy material |
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| CN103128932A (en) * | 2011-11-28 | 2013-06-05 | 马斯特模具（昆山）有限公司 | Improved structure of hot runner mold |
| CN104550805A (en) * | 2015-02-08 | 2015-04-29 | 东北大学 | Device and method for preparing magnesium alloy ingot blank for deformation |
| CN104841898A (en) * | 2015-05-11 | 2015-08-19 | 苏州有色金属研究院有限公司 | Method and device capable of producing multiple pieces of magnesium alloy cast sticks simultaneously |
| CN207255235U (en) * | 2017-09-29 | 2018-04-20 | 辽宁科技大学 | A kind of crystallizer immersion rotates the mouth of a river |
| CN113976829A (en) * | 2021-07-29 | 2022-01-28 | 江苏奇纳新材料科技有限公司 | Casting system and casting method for vacuum induction melting of high-temperature alloy |
| CN114029455A (en) * | 2021-10-29 | 2022-02-11 | 中国航发贵州红林航空动力控制科技有限公司 | Investment casting single sprue with slag collecting groove |
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004066302A (en) * | 2002-08-07 | 2004-03-04 | Tadamasa Fujimura | Manufacturing apparatus of magnesium alloy material, manufacturing method of magnesium alloy material, and magnesium alloy material |
| CN201244679Y (en) * | 2008-04-17 | 2009-05-27 | 上海交通大学 | Plugging mechanism capable of controlling flow rate of magnesium alloy melt |
| CN103128932A (en) * | 2011-11-28 | 2013-06-05 | 马斯特模具（昆山）有限公司 | Improved structure of hot runner mold |
| CN102954033A (en) * | 2012-11-30 | 2013-03-06 | 无锡艾比德泵业有限公司 | Semi-open centrifugal pump impeller |
| CN104550805A (en) * | 2015-02-08 | 2015-04-29 | 东北大学 | Device and method for preparing magnesium alloy ingot blank for deformation |
| CN104841898A (en) * | 2015-05-11 | 2015-08-19 | 苏州有色金属研究院有限公司 | Method and device capable of producing multiple pieces of magnesium alloy cast sticks simultaneously |
| CN207255235U (en) * | 2017-09-29 | 2018-04-20 | 辽宁科技大学 | A kind of crystallizer immersion rotates the mouth of a river |
| CN113976829A (en) * | 2021-07-29 | 2022-01-28 | 江苏奇纳新材料科技有限公司 | Casting system and casting method for vacuum induction melting of high-temperature alloy |
| CN114029455A (en) * | 2021-10-29 | 2022-02-11 | 中国航发贵州红林航空动力控制科技有限公司 | Investment casting single sprue with slag collecting groove |
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