阅读说明：本技术 一种采用离心铸造制备金属板的方法 (Method for preparing metal plate by centrifugal casting ) 是由 尚德礼 廖相巍 康磊 吕春风 康伟 张维维 李广帮 黄玉平 于 2019-09-29 设计创作，主要内容包括：本发明属于钢铁冶炼领域,尤其涉及一种采用离心铸造制备金属板的方法。包括如下步骤：模具预热,挂隔热涂料,控制待浇铸金属液成分及过热度,模具转速达标时进行浇铸,离心机转速为零时,自然冷却,取出管坯,加热炉加热管坯并粗轧,管坯切边,精轧。本发明采用离心铸造技术有助于液体金属中气体和夹杂物的排除,可获得纯度高、等轴晶率高的金属材料,彻底解决连铸坯及铸锭方式生产金属板的所遗留的缺陷问题,可以制备性能优异的金属板,同时简单易行,可以节约材料消耗,减少加工时间和加工成本。(The invention belongs to the field of steel smelting, and particularly relates to a method for preparing a metal plate by centrifugal casting. The method comprises the following steps: preheating a mould, hanging a heat insulation coating, controlling the components and superheat degree of molten metal to be cast, casting when the rotating speed of the mould reaches the standard, naturally cooling when the rotating speed of a centrifugal machine is zero, taking out a pipe blank, heating the pipe blank by a heating furnace, roughly rolling, trimming the pipe blank, and finish rolling. The invention adopts the centrifugal casting technology to help to eliminate gas and impurities in liquid metal, can obtain metal materials with high purity and high isometric crystal rate, thoroughly solves the problem of the defects left by producing metal plates by continuous casting billets and ingot casting, can prepare the metal plates with excellent performance, is simple and easy to operate, can save material consumption, and reduces processing time and processing cost.)

1. A method for preparing a metal plate by centrifugal casting is characterized by comprising the following steps:

1) preheating a mould;

2) hanging heat insulation coating, namely uniformly hanging the heat insulation coating on the working surface of the pipe die;

3) controlling the components of the molten metal to be cast within a required range, and controlling the superheat degree of the molten metal;

4) casting when the rotating speed of the mold reaches the standard, pouring molten metal into the mold, introducing protective gas into the mold in the pouring process to prevent the surface of the metal from being oxidized, and adding a separant to the inner wall of the tube blank after the molten metal is poured;

5) when the rotating speed of the centrifugal machine is zero, naturally cooling, disassembling the die and taking out the tube blank;

6) the method comprises the following steps of processing a pipe blank according to the biting condition of a rolling mill, flattening the pipe blank with larger outer diameter of the pipe blank by a press until the pipe blank can be bitten by the rolling mill, and directly rolling the pipe blank with smaller outer diameter of the pipe blank without processing;

7) heating the tube blank, and carrying out rough rolling on the tube blank until the tube blank is leveled;

8) trimming the rolled and flattened tube blank, determining the cutting amount of two sides according to the thickness of the tube blank, ensuring that two layers of steel plates are not in metal connection after trimming, and separating the two steel plates;

9) and (4) performing finish rolling on the separated steel plate to obtain a finished product.

2. The method for preparing metal plate by centrifugal casting as claimed in claim 1, wherein the preheating temperature of the mold in step 1) is 600-800 ℃.

3. The method for preparing a metal plate by centrifugal casting according to claim 1, wherein the thermal insulation coating in step 2) is resin-coated sand, the resin-coated sand is poured along a rotating pipe die, and the thickness of the resin-coated sand uniformly hung on the working surface of the pipe die is 5-8 mm.

4. The method for manufacturing a metal plate by centrifugal casting as recited in claim 1, wherein a degree of superheat of said molten metal in said step 3) is controlled to be 30 to 120 ℃.

5. The method as claimed in claim 1, wherein the rotational speed of the mold in step 4) reaches 600-.

6. The method for manufacturing metal plates by centrifugal casting as claimed in claim 1, wherein the natural cooling temperature is 1000-400 ℃ when the rotation speed of the centrifuge in step 5) is zero.

7. The method for producing a metal plate by centrifugal casting according to claim 1, wherein the tube blank having a larger outer diameter of the tube blank in step 6) is a cast product having an outer diameter of 250mm or more, the tube blank having a smaller outer diameter of the tube blank is a tube blank having a diameter of less than 250mm, and the tube blank having a smaller outer diameter of the tube blank is rolled directly without any treatment until the tube blank can be bitten into the rolling mill for the cast product having an outer diameter of 250mm or more.

8. The method for manufacturing metal plate by centrifugal casting as claimed in claim 1, wherein the step 7) of heating the tube blank is performed at a temperature of 700 ℃ and 1300 ℃.

Technical Field

The invention belongs to the field of steel smelting, and particularly relates to a method for preparing a metal plate by centrifugal casting.

Background

Centrifugal casting is a technique and method for filling a casting mold with molten metal by injecting the molten metal into the mold rotating at a high speed and causing the molten metal to move centrifugally to fill the mold and form a casting. The centrifugal motion causes the liquid metal to fill the mould well in the radial direction and form a free surface of the casting, which facilitates the removal of gas and inclusions from the liquid metal, which affects the crystallization process of the metal, thereby improving the mechanical and physical properties of the casting. The centrifugal casting has the characteristics of wide application, low cost and high efficiency, solves the problem that the seamless steel pipe cannot produce a thick-wall steel pipe, can cast a hollow cylindrical shape and cast steel pipes with different diameters, wall thicknesses and lengths without sand cores compared with other casting process methods, and has the advantages of high production efficiency and low cost. The centrifugally cast steel pipe is widely applied to manufacturing of various equipment, and the cost of the equipment can be reduced, such as roller beds of transmission systems of steel tapping machines, steel pushing machines, steel loading machines and the like in the metallurgical industry.

The current methods for producing metal plates mainly include the following two methods: one method is that a continuous casting billet is prepared through a continuous casting machine, and then the continuous casting billet is rolled through a rolling mill to prepare a qualified metal plate; another method is to cast a metal ingot by a die casting process and then roll the metal ingot by rolling to prepare a metal plate. The casting blank in the above technology, whether continuous casting or die casting, inevitably exists as follows: the defects of component segregation of the casting blank, overproof inclusions of the casting blank and the like cannot be eliminated in the rolling process, so that the performance of the metal plate is unstable, and the quality cannot meet the requirement.

The centrifugal casting technology is beneficial to removing gas and impurities in liquid metal, and metal materials with high purity and isometric crystal rate can be obtained, but the centrifugal casting is mainly applied to preparing pipe products, and the technology for preparing metal plates is still to be developed.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a method for preparing a metal plate by centrifugal casting. The method can be used for preparing the metal plate with excellent performance, and thoroughly solves the problems of poor performance of the metal plate caused by component segregation, low equiaxed crystal rate and high inclusion content caused by a continuous casting or ingot casting process.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for preparing a metal plate by centrifugal casting specifically comprises the following steps:

(1) the mold was preheated to 600-800 ℃.

(2) And (3) hanging the heat insulation coating, pouring resin coated sand along the rotating pipe die, and uniformly hanging the resin coated sand on the working surface of the pipe die by 5-8 mm.

(3) The components of the molten metal to be cast are controlled within a required range, and the superheat degree of the molten metal is controlled between 30 and 120 ℃.

(4) The rotating speed of the mould reaches 600 plus 1000 revolutions per minute, the metal liquid is poured into the mould through a launder, one metal liquid can be poured, and 2 or more than 2 metal liquids can be poured to prepare the composite metal plate. Argon is introduced into the mold in the casting process to protect the metal surface from oxidation. And adding a release agent to the inner wall of the tube blank after the molten metal pouring is finished. The centrifugal casting process may water cool the mold.

(5) When the rotating speed of the centrifuge is zero, and then the centrifuge is naturally cooled to 1000-400 ℃, the mold is disassembled, and the tube blank is taken out.

(6) The tube blank is processed according to the biting condition of a rolling mill, for a casting with the outer diameter of the tube blank being more than or equal to 250mm, the tube blank is flattened by a press until the rolling mill can bite, and for the tube blank with the tube diameter being less than 250mm, the tube blank can be directly rolled without processing.

(7) Heating the tube blank by the heating furnace at the temperature of 700 ℃ and 1300 ℃, and roughly rolling the tube blank by the rolling mill until the tube blank is leveled.

(8) And trimming the rolled and flattened tube blank, wherein the trimming amount of two sides is determined according to the thickness of the tube blank, and the two layers of steel plates after trimming are ensured not to be connected with metal. Because a certain amount of separant exists in the two steel plates, the two steel plates can be separated.

(9) And (3) performing finish rolling on the separated steel plate, and performing heating or non-heating treatment according to actual needs before finish rolling to finally obtain the steel plate with excellent performance.

Compared with the prior art, the invention has the beneficial effects that:

the invention adopts the centrifugal casting technology to help to eliminate gas and impurities in liquid metal, can obtain metal materials with high purity and high isometric crystal rate, thoroughly solves the problem of the defects left by producing metal plates by continuous casting billets and ingot casting, can prepare the metal plates with excellent performance, is simple and easy to operate, can save material consumption, and reduces processing time and processing cost.

Detailed Description

The following further illustrates embodiments of the invention, but is not intended to limit the scope thereof:

a method for preparing a metal plate by centrifugal casting specifically comprises the following steps:

(1) preheating a mould to 600-800 ℃;

(2) and (3) hanging the heat insulation coating, pouring resin coated sand along the rotating pipe die, and uniformly hanging the resin coated sand on the working surface of the pipe die by 5-8 mm.

(3) The components of the molten metal to be cast are controlled within a required range, and the superheat degree of the molten metal is controlled between 30 and 120 ℃.

(4) The rotating speed of the mould reaches 600 plus 1000 revolutions per minute, the metal liquid is poured into the mould through a launder, one metal liquid can be poured, and 2 or more than 2 metal liquids can be poured to prepare the composite metal plate. Argon is introduced into the mold in the casting process to protect the metal surface from oxidation. And adding a release agent to the inner wall of the tube blank after the molten metal pouring is finished. The centrifugal casting process may water cool the mold.

(5) When the rotating speed of the centrifuge is zero, and then the centrifuge is naturally cooled to 1000-400 ℃, the mold is disassembled, and the tube blank is taken out.

(6) The tube blank is processed according to the biting condition of a rolling mill, for a casting with the outer diameter of the tube blank being more than or equal to 250mm, the tube blank is flattened by a press until the rolling mill can bite, and for the tube blank with the tube diameter being less than 250mm, the tube blank can be directly rolled without processing.

(7) Heating the tube blank by the heating furnace at the temperature of 700 ℃ and 1300 ℃, and roughly rolling the tube blank by the rolling mill until the tube blank is leveled.

(8) And trimming the rolled and flattened tube blank, wherein the trimming amount of two sides is determined according to the thickness of the tube blank, and the two layers of steel plates after trimming are ensured not to be connected with metal. Because a certain amount of separant exists in the two steel plates, the two steel plates can be separated.

(9) And (3) performing finish rolling on the separated steel plate, and performing heating or non-heating treatment according to actual needs before finish rolling to finally obtain the steel plate with excellent performance.

The following is a detailed description of the embodiments of the present invention by referring to 2 examples, which are shown below: