阅读说明：本技术 一种用于生产辊皮的铸造工艺 (Casting process for producing roller skin ) 是由 赵飞文 朱国伟 戴红焱 朱鑫宇 于 2019-09-10 设计创作，主要内容包括：本发明涉及升降机技术领域,具体为一种用于生产辊皮的铸造工艺,具体包括以下步骤：步骤一,转炉初炼钢水出钢至钢包：采用铝丝和稀土硅终脱氧,铝丝加入量为1.5kg/吨钢水,稀土硅加入量为1kg/吨钢水,出钢前放入包底；步骤二,钢包底吹氩气精炼：包底吹氩时间为3~5分钟,吹氩后将钢水镇静3~5分钟：步骤三,当浇注温度合格时拿出氩气管,开始浇注,浇注温度为1340℃~1350℃,按上限1350℃对水口开浇；步骤四,保温冷却后取出铸件,打磨铸件,再进行机械性能、磁粉检测及机加工。(The invention relates to the technical field of elevators, in particular to a casting process for producing a roller skin, which specifically comprises the following steps: firstly, tapping primary molten steel in a converter to a ladle: final deoxidation is carried out by adopting aluminum wires and rare earth silicon, the adding amount of the aluminum wires is 1.5 kg/ton of molten steel, the adding amount of the rare earth silicon is 1 kg/ton of molten steel, and the aluminum wires and the rare earth silicon are placed into a ladle bottom before tapping; step two, ladle bottom argon blowing refining: the argon blowing time of the ladle bottom is 3-5 minutes, and after argon blowing, the molten steel is calmed for 3-5 minutes: taking out the argon pipe when the pouring temperature is qualified, and starting pouring, wherein the pouring temperature is 1340-1350 ℃, and pouring the water gap at the upper limit of 1350 ℃; and step four, taking out the casting after heat preservation and cooling, polishing the casting, and then carrying out mechanical property and magnetic powder detection and machining.)

1. A casting process for producing a roller shell is characterized by comprising the following steps:

firstly, tapping primary molten steel in a converter to a ladle: final deoxidation is carried out by adopting aluminum wires and rare earth silicon, the adding amount of the aluminum wires is 1.5 kg/ton of molten steel, the adding amount of the rare earth silicon is 1 kg/ton of molten steel, and the aluminum wires and the rare earth silicon are placed into a ladle bottom before tapping;

step two, ladle bottom argon blowing refining: the argon blowing time of the ladle bottom is 3-5 minutes, and after argon blowing, the molten steel is calmed for 3-5 minutes:

blowing argon into the cavity, plugging an argon pipe into the sprue before pouring, opening the argon, and blowing the argon into the cavity for 1-3 minutes;

argon is blown from the ladle nozzle, an argon pipe is connected with an argon blowing ring of the ladle nozzle before pouring, when the molten steel reaches the pouring temperature, an argon meter is opened in advance for 10 seconds, argon is blown continuously in the pouring process, and the argon is closed until the pouring is finished;

taking out the argon pipe when the pouring temperature is qualified, and starting pouring, wherein the pouring temperature is 1340-1350 ℃, and pouring the water gap at the upper limit of 1350 ℃;

and step four, taking out the casting after heat preservation and cooling, polishing the casting, and then carrying out mechanical property and magnetic powder detection and machining.

2. The casting process for producing the roll skin as claimed in claim 1, wherein in the step one, the particle size of the rare earth silicon is 3-5 mm.

3. A casting process for producing a roll skin according to claim 1, wherein in the second step, the specific time for blowing argon into the cavity is determined according to the size of the casting, 1 minute for the small part and 3 minutes for the large part.

4. A casting process for producing roll shells according to claim 1, wherein in step three, a pouring ladle is used, and the size of a water gap is phi 60 mm.

5. A casting process for producing roll shells according to claim 1, wherein in step three, the pouring starts with slow drainage, then is performed with full-open fast pouring, and finally the molten steel is poured slowly as soon as the riser.

Technical Field

The invention relates to the technical field of roller shell casting, in particular to a casting process for producing a roller shell.

Background

The roller shell generally belongs to medium and large-sized casting parts, and along with the development of the industry, the roller shell has higher and higher requirements on various properties in the actual production.

The roll skin can be divided into two types from the technical point of view: casting and forging. The casting roller skin mainly adopts high manganese steel which has strong shock resistance and good toughness, and when the casting roller skin is acted by a larger impact load or extrusion stress, the austenite on the surface layer can generate a hardening effect due to stress. The high manganese steel can bear strong impact load through good matching of high hardness of the surface layer and high toughness of the inside, and has high wear resistance without cracking.

However, high manganese steels have low initial hardness and do not exhibit sufficient wear resistance under the working conditions where the impact hardening ability is insufficient.

Disclosure of Invention

The object of the present invention is to provide a casting process for producing a roll skin that solves the problems set forth in the background art mentioned above.

In order to achieve the purpose, the invention provides the following technical scheme: a casting process for producing a roller shell specifically comprises the following steps:

firstly, tapping primary molten steel in a converter to a ladle: final deoxidation is carried out by adopting aluminum wires and rare earth silicon, the adding amount of the aluminum wires is 1.5 kg/ton of molten steel, the adding amount of the rare earth silicon is 1 kg/ton of molten steel, and the aluminum wires and the rare earth silicon are placed into a ladle bottom before tapping;

step two, ladle bottom argon blowing refining: the argon blowing time of the ladle bottom is 3-5 minutes, and after argon blowing, the molten steel is calmed for 3-5 minutes:

1) blowing argon into the cavity, plugging an argon pipe into the sprue before pouring, opening the argon, and blowing the argon into the cavity for 1-3 minutes;

2) argon is blown from the ladle nozzle, an argon pipe is connected with an argon blowing ring of the ladle nozzle before pouring, when the molten steel reaches the pouring temperature, an argon meter is opened in advance for 10 seconds, argon is blown continuously in the pouring process, and the argon is closed until the pouring is finished;

taking out the argon pipe when the pouring temperature is qualified, and starting pouring, wherein the pouring temperature is 1340-1350 ℃, and pouring the water gap at the upper limit of 1350 ℃;

and step four, taking out the casting after heat preservation and cooling, polishing the casting, and then carrying out mechanical property and magnetic powder detection and machining.

Preferably, in the step one, the granularity of the rare earth silicon is 3-5 mm.

Preferably, in the second step, the specific time for blowing argon into the cavity is 1 minute for the small part and 3 minutes for the large part according to the size of the casting.

Preferably, in the third step, a drain ladle is adopted for pouring, and the size of a water gap is phi 60 mm.

Preferably, in the third step, the pouring is started to drain slowly, then is performed fully open and is performed rapidly, and finally, the molten steel is poured slowly when reaching a riser.

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

the rare earth silicon is added in the casting process of the roller shell, so that the cast structure can be obviously refined, the form, the size and the distribution of inclusions are improved, the harmful effects of the inclusions are greatly reduced, and the rare earth and elements such as S, N, H, O in molten steel form to play roles in desulfurization, deoxidation, nitrogen fixation and hydrogen fixation, so that the pore defects and hydrogen embrittlement hazards of castings are reduced; meanwhile, the rare earth and MnO, FeO and the like of the molten steel form high-melting-point compounds which are already in a solid state before the molten steel is solidified, so that dispersively distributed crystal nuclei are formed in the molten steel solidification process, the distribution quantity of inclusions in the crystal nuclei is greatly increased, austenite crystal grains are refined, the generation of thermal cracks is hindered, and the growth of coarse columnar crystals is inhibited, thereby improving the impact resistance and the wear resistance of the high manganese steel serving under a strong impact load. Not only improves the yield strength and the impact toughness of the manganese steel, but also enhances the work hardening capacity of the high manganese steel, and accelerates the work hardening speed. Meanwhile, the fluidity and the mold filling capacity of the molten steel are enhanced.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.

The invention provides a technical scheme that: a casting process for producing a roller shell specifically comprises the following steps:

firstly, tapping primary molten steel in a converter to a ladle: final deoxidation is carried out by adopting aluminum wires and rare earth silicon, the adding amount of the aluminum wires is 1.5 kg/ton of molten steel, the adding amount of the rare earth silicon with the granularity of 3-5 mm is 1 kg/ton of molten steel, and the aluminum wires and the rare earth silicon are placed into a ladle bottom before tapping;

step two, ladle bottom argon blowing refining: the argon blowing time of the ladle bottom is 3-5 minutes, and after argon blowing, the molten steel is calmed for 3-5 minutes:

3) blowing argon into the cavity, plugging an argon pipe into the sprue before pouring, opening the argon, and blowing the argon into the cavity for 1-3 minutes;

4) argon is blown from the ladle nozzle, an argon pipe is connected with an argon blowing ring of the ladle nozzle before pouring, when the molten steel reaches the pouring temperature, an argon meter is opened in advance for 10 seconds, argon is blown continuously in the pouring process, and the argon is closed until the pouring is finished;

the specific time of blowing argon into the cavity is 1 minute for small parts and 3 minutes for large parts according to the size of the casting;

taking out an argon pipe when the pouring temperature is qualified, starting pouring, wherein the pouring temperature is 1340-1350 ℃, pouring a water gap at the upper limit of 1350 ℃, starting slow drainage for pouring, then fully opening and quickly pouring, and finally slowly pouring when molten steel reaches a riser, wherein a pouring ladle is adopted for pouring, and the size of the water gap is phi 60 mm;

and step four, taking out the casting after heat preservation and cooling, polishing the casting, and then carrying out mechanical property and magnetic powder detection and machining.

Practice proves that the method has obvious effects of purifying molten steel, refining the structure, eliminating columnar crystals, improving the metallurgical quality and improving the comprehensive mechanical property of steel.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.