阅读说明：本技术 一种模铸钢浇注工艺 (Die cast steel pouring process ) 是由 乔森鹏 石荣才 郭文香 全会峰 于 2021-06-10 设计创作，主要内容包括：本发明公开一种模铸钢浇注工艺,通过在浇注的时侯,根据锭模液面上升情况,适时的微调浇注速度；冒口补缩时间比原工艺降低了10％左右,增加了冒口钢水温度的热容值,有利于消除钢锭二次缩孔及气体和夾杂物排除；冒口补缩后期,取消加发热剂,并使加覆盖剂时间提前了1～2分钟,达到了提前保温的效果,同时,不但降低了生产成本,而且消除了因加发热剂造成的环境污染。尤其值得一提的是,为后道工序(锻压或锻打)提高了模铸钢的成材率。主要是冒口的利用率可达20％～30％。而原加发热剂的工艺,冒口利用率几乎为零。所以,通过以上浇注工艺的发明,其经济效益和社会效益均为显著。(The invention discloses a die casting steel pouring process, which can timely finely adjust the pouring speed according to the rising condition of the liquid level of an ingot die during pouring; the feeding time of the feeder head is reduced by about 10 percent compared with the prior art, the heat capacity value of the molten steel temperature of the feeder head is increased, and the secondary shrinkage cavity of the steel ingot and the removal of gas and impurities are favorably eliminated; and in the later feeding stage of the riser, the heating agent is not added, and the covering agent adding time is advanced by 1-2 minutes, so that the effect of heat preservation in advance is achieved, meanwhile, the production cost is reduced, and the environmental pollution caused by the heating agent is eliminated. In particular, the yield of die-cast steel is increased for the subsequent process (forging or forging). Mainly, the utilization rate of the riser can reach 20-30%. The utilization rate of the dead head of the original process for adding the heating agent is almost zero. Therefore, the invention of the pouring process has obvious economic benefit and social benefit.)

1. A die casting steel pouring process is characterized by comprising the following process flows:

1) carrying out VD treatment on the molten steel obtained by smelting, and hoisting after final deoxidation;

2) molten steel is calmed;

3) pouring the ingot body, namely pouring molten steel into the ingot mould, and slowly reducing the pouring speed when the molten steel rises too fast;

4) feeding a riser;

5) adding a covering agent, and when the steel ingot riser is fed to about 95 percent of the steel ingot riser, adding the covering agent;

6) the trickle is used for supplementing, and the trickle is used for supplementing after the riser is supplemented, so that the soup channel and the middle injection pipe are filled;

7) and covering the steel ingot with a cover for slow cooling, and hanging a heat-preservation cover for covering the steel ingot.

2. The mold-cast steel pouring process as claimed in claim 1, wherein the superheat degree of the molten steel pouring process is controlled to be 46-50 ℃.

3. The process of mold-casting steel according to claim 1, wherein the insulated risers must be dry and the baking temperature before use is around 80 ℃.

4. The molded steel casting process of claim 1, wherein said covering agent is carbonized rice hulls.

Technical Field

The invention relates to the field of die-cast steel ingots, in particular to a die-cast steel pouring process.

Background

In the traditional three-stage pouring process, under the condition that the steel type is the same as the ingot type, the ingot body pouring time and the riser feeding time are relatively fixed. And the feeding time of the riser is too long, so that the secondary oxidation of the molten steel is serious, and the inherent quality of the steel is influenced. Secondly, the longer the feeding time of the riser is, the faster the molten steel passing through a nozzle is cooled, so that the temperature and the heat capacity value of the molten steel of the riser are lower, the precipitation effect on gas and impurities is poorer, and the feeding effect on cast steel, the quality of the molten steel in the riser and the yield of forged steel are influenced to a certain extent.

No matter the traditional textbook or the current production process requirement, a certain amount of exothermic agent is required to be added in the later stage of steel ingot riser feeding in the production and pouring process of the die-cast steel. The dosage of the steel is 0.5 KG-1.0 KG per ton of steel. Aims to increase the temperature of riser molten steel, be beneficial to feeding an ingot body at the lower end of a riser and solve the problems of serious loosening and shrinkage of a steel ingot

The main components of the heat generating agent are: aluminum powder, ferrosilicon powder, fluorite, ferric oxide powder and the like. The heat generating agent is added into liquid high-temperature molten steel, and the melting process is an endothermic reaction (actually, a temperature reduction process). Only when the heating agent is fully melted, a large amount of heat can be released, the heat is absorbed in the melting process, and the heat generated in the heating (heat release) process can be accurately calculated through a formula. The heat absorption and the heat release are balanced, and the residual heat is the newly added heat.

However, the heat released is not completely generated in the vacuum vessel, and a considerable portion is dissipated in the atmosphere. That is, the released heat is not absorbed by the liquid molten steel in the riser, lost in the atmosphere, and causes environmental pollution. Therefore, it is considered that the effect of the exothermic agent added in this case on feeder locking is not as good as imaginable, and that there are also many adverse effects.

Therefore, a die casting steel pouring process which is capable of timely adjusting pouring time and riser locking time and does not adopt a heating agent is needed.

Disclosure of Invention

The invention mainly aims to provide a die casting steel pouring process which can timely adjust pouring time and riser locking time and does not adopt a heating agent.

The invention provides a die casting steel pouring process, which comprises the following process flows:

1) carrying out VD treatment on the molten steel obtained by smelting, and hoisting after final deoxidation;

2) molten steel is calmed;

3) pouring the ingot body, namely pouring molten steel into the ingot mould, and slowly reducing the pouring speed when the molten steel rises too fast;

4) feeding a riser;

5) adding a covering agent, and when the steel ingot riser is fed to about 95 percent of the steel ingot riser, adding the covering agent;

6) the trickle is used for supplementing, and the trickle is used for supplementing after the riser is supplemented, so that the soup channel and the middle injection pipe are filled;

7) and covering the steel ingot with a cover for slow cooling, and hanging a heat-preservation cover for covering the steel ingot.

Preferably, the superheat degree of the molten steel pouring process is controlled to be 46-50 ℃.

Preferably, the insulated risers must be dry, with a baking temperature of around 80 ℃ before use.

Preferably, the covering agent is carbonised rice husk.

The beneficial effects of the die casting steel pouring process of the invention are as follows:

1. the pouring speed is invariable all the time when the traditional molten steel is poured, but in the actual pouring process, the situation that the liquid molten steel is easy to go out of the steel ingot mould and rise too fast is mostly shown as follows: firstly, the covering slag is diluted and melted, secondly, the liquid molten steel and the covering slag are convex at the center of the steel die, and the rolling phenomenon is generated when the liquid molten steel and the covering slag are serious, and thirdly, the color of the molten steel is bright and dazzling. By reducing the pouring speed slowly in time, the defects of slag rolling of molten steel, secondary oxidation of the molten steel, increase of gas content and gas inclusion, center looseness, inclusion aggregation and the like can be avoided.

2. The exothermic agent is not added in the riser feeding process, so that the pollution to the environment after the exothermic agent is added can be reduced and eliminated, the cost increased by the addition of the exothermic agent is reduced, the steel ingot yield in the subsequent process (forging or forging) is improved, the riser utilization rate can reach 20% -30%, the riser utilization rate is almost zero in the original process of adding the exothermic agent, the addition time of the covering agent is advanced by 1-2 minutes because the exothermic agent is not added in the riser, and the effect of advanced heat preservation is achieved.

3. By adding the covering agent in advance, the whole process time can be shortened, so that the effect of heat preservation in advance is achieved, the whole process time of riser feeding is shortened, secondary oxidation of molten steel is reduced, and the internal quality of steel ingots is guaranteed.

Drawings

FIG. 1 is a process flow diagram of the cast steel pouring process of the present invention;

the implementation, functional features and advantages of the objects of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, an embodiment of the cast steel pouring process of the present invention is provided:

a die casting steel pouring process is characterized by comprising the following process flows:

1) carrying out VD treatment on the molten steel obtained by smelting, and hoisting after final deoxidation;

2) molten steel is calmed;

3) pouring an ingot body, namely pouring molten steel into the ingot mould, slowly reducing the pouring speed when the molten steel rises too fast, and controlling the superheat degree of the molten steel pouring process to be 46-50 ℃;

4) feeding risers, drying the insulated risers, and baking at about 80 ℃ before use;

5) adding a covering agent, wherein when the steel ingot feeder head is fed to about 95 percent of the steel ingot feeder head, the covering agent is carbonized rice hulls;

6) the trickle is used for supplementing, and the trickle is used for supplementing after the riser is supplemented, so that the soup channel and the middle injection pipe are filled;

7) and covering the steel ingot with a cover for slow cooling, and hanging a heat-preservation cover for covering the steel ingot.

The beneficial effects of the die casting steel pouring process of the invention are as follows:

1. the pouring speed is invariable all the time when the traditional molten steel is poured, but in the actual pouring process, the situation that the liquid molten steel is easy to go out of the steel ingot mould and rise too fast is mostly shown as follows: firstly, the covering slag is diluted and melted, secondly, the liquid molten steel and the covering slag are convex at the center of the steel die, and the rolling phenomenon is generated when the liquid molten steel and the covering slag are serious, and thirdly, the color of the molten steel is bright and dazzling. By reducing the pouring speed slowly in time, the defects of slag rolling of molten steel, secondary oxidation of the molten steel, increase of gas content and gas inclusion, center looseness, inclusion aggregation and the like can be avoided.

2. The exothermic agent is not added in the riser feeding process, so that the pollution to the environment after the exothermic agent is added can be reduced and eliminated, the cost increased by the addition of the exothermic agent is reduced, the steel ingot yield in the subsequent process (forging or forging) is improved, the riser utilization rate can reach 20% -30%, the riser utilization rate is almost zero in the original process of adding the exothermic agent, the addition time of the covering agent is advanced by 1-2 minutes because the exothermic agent is not added in the riser, and the effect of advanced heat preservation is achieved.

3. By adding the covering agent in advance, the whole process time can be shortened, so that the effect of heat preservation in advance is achieved, the whole process time of riser feeding is shortened, secondary oxidation of molten steel is reduced, and the internal quality of steel ingots is guaranteed.

The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, are included in the scope of the present invention.