CN110257154B

CN110257154B - Preparation method of rolling lubricating liquid base oil

Info

Publication number: CN110257154B
Application number: CN201910465304.8A
Authority: CN
Inventors: 张良; 武志平; 徐书峰; 付金柱; 石育帆; 杨西才
Original assignee: Shanxi Taigang Stainless Steel Co Ltd
Current assignee: Shanxi Taigang Stainless Steel Co Ltd
Priority date: 2019-05-30
Filing date: 2019-05-30
Publication date: 2022-08-02
Anticipated expiration: 2039-05-30
Also published as: CN110257154A

Abstract

The invention discloses a preparation method of rolling lubricating liquid base oil, wherein the preparation method comprises the following steps: step S1 is executed, wherein during rolling of rolled pieces, the granularity of the rolling lubricating fluid is adjusted to a desired use state by dynamically adjusting the granularity of the rolling lubricating fluid on a rolling site so as to obtain the rolling lubricating fluid with the desired granularity; performing step S2, wherein the rolling lubricant with the desired granularity is laboratory analyzed and the value of the desired granularity is measured to reversely derive a base oil formula with the desired granularity; and performing step S3, wherein a base oil is produced according to the obtained base oil formulation. The invention can obviously shorten the debugging period of the rolling lubricating liquid base oil and greatly reduce the production and manufacturing costs of oil plants and steel plants.

Description

Preparation method of rolling lubricating liquid base oil

Technical Field

The invention relates to the technical field of stainless steel cold rolling lubrication, in particular to a preparation method of rolling lubricating liquid base oil.

Background

The stainless steel cold continuous rolling mill is lubricated by rolling lubricating liquid. At present, the rolling lubricating fluid mainly adopts emulsion, so the rolling lubricating fluid is also often called emulsion, and the emulsion is formed by mixing base oil and demineralized water according to a certain proportion. In view of the difference of lubrication conditions such as the requirements of the type of a rolling mill, the roughness of a roller, the surface roughness of strip steel and the like, the thickness and the strength of an oil film formed in a deformation zone have high requirements. The granularity of the base oil plays a crucial role in the thickness and strength of the oil film. The larger the granularity is, the easier the oil film is formed, the higher the oil film thickness and strength is, the better the lubrication is, the higher the surface roughness of the strip steel is, and conversely, the lower the surface roughness of the strip steel is.

Generally, the particle size of the base oil is typically determined by first formulating the base oil in a laboratory, processing it in a small batch at an oil mill, and sending it to a steel mill for testing. Once the particle size is not sufficient for on-site production, it is necessary to wait for the base oil produced in the next batch in the oil plant. Thus, multiple repeated field trials are often required to obtain the optimum particle size and base oil with the optimum particle size. However, this produces many defective products, and the adjustment cycle is long, which increases the production cost of both steel mills and oil mills. Traditionally, a defined conditioning or testing cycle for base oil particle size typically takes 6 batches, which takes 3 months. Thus, the conventional method of preparing rolling lubricant base oil having the desired base oil particle size takes a long time and produces many off-spec products, which are expensive to produce.

Therefore, there is a need in the art for a new method for preparing rolling lubricant base oil, which can significantly shorten the debugging period of the rolling lubricant base oil formulation and reduce the production and manufacturing costs.

Disclosure of Invention

In view of the above problems in the prior art, an object of the present invention is to provide a method for preparing a rolling lubricant base oil, which can dynamically adjust the granularity of the rolling lubricant in-situ in a rolling state of a continuous rolling mill in a factory to adjust the granularity of the rolling lubricant to an optimal or expected use state, so as to reversely derive an expected base oil formula, thereby significantly shortening the debugging period of the rolling lubricant base oil and greatly reducing the production and manufacturing costs of oil plants and steel plants.

It is emphasized that, unless otherwise indicated, the terms used herein correspond to the ordinary meanings of the various technical and scientific terms in the art, and the meanings of the technical terms defined in the various technical dictionaries, textbooks, etc.

The term "demineralized water" refers to finished water obtained by removing impurities from water such as suspended solids, colloids, and inorganic cations and anions using various water treatment processes.

The term "particle size" refers to the size of the oil droplet particles in the emulsion.

The stability of the emulsion is an extremely important indicator. Emulsions can be classified into stable emulsions, semi-stable emulsions, and unstable emulsions, or emulsion, dispersion-stable emulsions, and dispersion-dispersed emulsions, depending on the stability after emulsification.

The term "Emulsion Stability Indicator (ESI)" indicates the Stability of an Emulsion by measuring the amount of oil separated after standing for 30 minutes, i.e., the Stability index of the Emulsion.

The term "rolling pressure" refers to the force that a roll applies to a product to cause plastic deformation, and may also be referred to as rolling force or total rolling pressure.

The term "forward slip" refers to the phenomenon in which the exit speed of the metal being rolled is greater than the peripheral speed of the rolls during rolling, and the descriptive parameter is called the forward slip value.

The emulsifier is an additive for controlling oil drop particles in the emulsion, and is a relatively key factor in rolling oil. The oil-water mixed roll has the main application that oil and water are mixed, and can play a role in lubricating a roll and a rolled piece and also play a role in cooling in the rolling process.

The term "concentration" is intended to mean the total concentration of rolling oil in the emulsion.

The term "water-leaving spreadability" refers to the ability of the oil phase component in an emulsion to adhere to a metal surface.

According to an embodiment of the present invention, there is provided a method for preparing rolling lubricant base oil, wherein the method comprises the steps of:

performing step S1, wherein during rolling of the rolled piece, the granularity of the rolling lubricant is dynamically adjusted at the rolling site to obtain the rolling lubricant with desired granularity;

performing step S2, wherein the rolling lubricant with the desired granularity is laboratory analyzed and the value of the desired granularity is measured to reversely derive a base oil formula with the desired granularity;

step S3 is performed in which a base oil is produced according to the obtained base oil formulation.

Further, the preparation method can also comprise the following steps: in performing step S1, first, step S11 may be performed in which a primary base oil having a design grain size is supplied to a rolling site and prepared as a primary rolling lubricant. Preferably, the design particle size may be 20 μm, and the primary rolling lubricant formulated from the primary base oil may have an Emulsion Stability Index (ESI) ranging from 0.2 to 0.4.

Further, the preparation method can also comprise the following steps: after step S11 is performed, step S12 is performed in which an appropriate number of rolled pieces are rolled in a batch.

Further, the preparation method can also comprise the following steps: in performing step S12, various rolling parameters may be monitored to ensure that the rolling conditions are stable. Preferably, the rolling parameters comprise roughness of the surface of the rolled piece, rolling force and forward slip value.

Further, the preparation method can also comprise the following steps: after step S12 is performed, step S13 may be performed wherein, at the end of the mill line, product samples may be taken to measure the roughness of the product surface.

Further, the preparation method can also comprise the following steps: after step S13 is performed, step S14 may be performed, wherein the granularity of the rolling lubricant may be adjusted based on the measured roughness of the surface of the rolled piece, wherein the granularity of the rolling lubricant may be decreased if the roughness of the surface of the rolled piece is greater and increased if the roughness of the surface of the rolled piece is less.

Further, the preparation method can also comprise the following steps: in step S14, if the roughness of the rolled piece surface is large, the granularity of the rolling lubricant can be reduced by adding a proper amount of primary base oil, water, and a special emulsifier; or if the roughness of the surface of the rolled piece is small, the granularity of the rolling lubricating fluid can be improved by adding a large amount of primary base oil and water.

Further, the preparation method can also comprise the following steps: after step S14 is performed, step S15 is performed, in which step S12, step S13 and step S14 are repeatedly performed to obtain a desired roughness of the rolled piece, and the rolling lubricant corresponding to the desired roughness of the rolled piece is sampled for graininess analysis.

Further, the preparation method can also comprise the following steps: after step S15 is performed, step S16 may be performed, in which if the granularity of the rolling lubricating liquid is too small, the primary base oil may be replenished in large amounts to obtain the rolling lubricating liquid having the desired granularity.

Further, the preparation method can also comprise the following steps: after step S16 is performed, step S17 may be performed wherein steps S1 and S2 may be repeated for a plurality of steel grades of rolling stock to determine an optimal rolling lubricant base oil formulation.

The preparation method of the rolling lubricating liquid base oil provided by the embodiment of the invention has the following beneficial effects:

firstly, the invention can greatly shorten the adjustment time and the preparation time of the base oil formula of the rolling lubricating liquid, for example, the adjustment time can be shortened from the traditional 6 batches of 3 months to 2 batches of 1 month;

secondly, the invention can reduce the product reject ratio in the process of adjusting the granularity of the rolling lubricating liquid;

thirdly, the invention can reduce the production cost of both the oil supplier and the steel mill, for example, the production cost of the oil mill and the steel mill can be reduced by more than 30 percent, and further, the quality of the steel plate can be quickly adjusted;

fourthly, the invention has strong adaptability and strong practicability, and can also be applied to the preparation of the rolling lubricating liquid base oil of other continuous rolling mills;

fifthly, the invention can solve the problem that the proportion of the rolling lubricating liquid base oil formula is not compatible with the field reality.

Drawings

The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 schematically shows a flow diagram of a method of making rolling lubricant base oil according to an embodiment of the present invention;

FIG. 2 further illustrates a flow diagram of a method of making the rolling lubricant base oil of FIG. 1;

FIG. 3 illustrates the relationship between the stability of the rolling lubricant and the surface roughness of the steel strip in the method for preparing the rolling lubricant base oil according to an example of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

The technical scheme provided by the embodiment of the invention is described in detail below with reference to the accompanying drawings.

Referring to fig. 1, according to an embodiment of the present invention, there is provided a method for preparing rolling lubricant base oil, wherein the method comprises the steps of:

Further, referring to fig. 2, the preparation method may further include: in performing step S1, first, step S11 may be performed in which a primary base oil having a design grain size is supplied to a rolling site and prepared as a primary rolling lubricant. Preferably, the design particle size may be 20 μm, and the primary rolling lubricant formulated from the primary base oil may have an Emulsion Stability Index (ESI) ranging from 0.2 to 0.4.

Further, the preparation method can also comprise the following steps: after step S11 is performed, step S12 may be performed, in which an appropriate number of rolled pieces are rolled in a batch.

Further, the preparation method can also comprise the following steps: in performing step S12, various rolling parameters may be monitored to ensure that the rolling conditions are stable. Preferably, the rolling parameters can comprise roughness of the surface of the rolled piece, rolling force, forward slip value and the like.

Further, the preparation method can also comprise the following steps: after step S12 is performed, step S13 may be performed wherein, at the end of the roll line, product samples are taken to measure the roughness of the product surface.

Further, the preparation method can also comprise the following steps: in step S14, if the roughness of the rolled piece surface is large, the granularity of the rolling lubricant can be reduced by adding a proper amount of primary base oil, water, and a special emulsifier; or if the roughness of the surface of the rolled piece is small, the granularity of the rolling lubricating liquid can be improved by adding a large amount of primary base oil and water.

Further, the preparation method can also comprise the following steps: after step S14 is performed, step S15 may be performed, in which step S12, step S13 and step S14 may be repeatedly performed to obtain a desired roughness of the rolled piece, and the rolling lubricant corresponding to the desired roughness of the rolled piece may be sampled for graininess analysis.

Further, the preparation method can also comprise the following steps: after step S15 is performed, step S16 may be performed, wherein if the granularity of the rolling lubricating liquid is too low, the primary base oil may be replenished in an appropriate amount to obtain the rolling lubricating liquid having the desired granularity.

The following describes in detail a method for preparing a rolling lubricant base oil according to an example of the present invention, taking a rolled steel strip as an example.

First, step S11 in step S1 may be performed. The primary base oil with the designed granularity can be supplied to a continuous rolling mill site, the granularity can be controlled to be about 20 mu m, and ESI of the primary rolling lubricating liquid prepared from the primary base oil can be controlled to be 0.2-0.4, namely the stable dispersion type or semi-stable type emulsion.

Next, step S12 may be performed. And (4) starting normal rolling, grinding the roller with the highest stability in batches by the assembly grinder, and keeping the roughness constant.

Next, after rolling is started, parameters such as rolling force, forward slip value and the like can be observed or monitored to ensure that the rolling state is stable.

Next, step S13 may be performed. When the rolled finished product reaches the tail part of the continuous rolling line, a plurality of samples can be selected to measure the roughness of the surface of the strip steel.

Next, step S14 may be performed.

Under the general condition, the granularity of the rolling lubricating liquid in the initial state is larger, the water-leaving spreadability is stronger, an oil film can be well formed, the lubrication is good, the surface roughness of the strip steel is high, and at the moment, the granularity reduction can be adjusted in the rolling state.

Typically, to ensure the stability of the rolling lubricant system, after the base oil and water are replenished, concentration measurements can be made, the amount of oil in the system calculated, and optionally a specific emulsifier can be added at a dosage of 10.5 kg/ton.

On the contrary, if the rolling lubricant in the initial state has a small particle size, the particle size can be adjusted to be increased.

Next, after the addition is finished, the cycle can be carried out for half an hour to ensure that oil drops in the rolling lubricating fluid are fully emulsified, then the rolling is carried out normally, and the sample is taken at the tail part of the continuous rolling line to measure the roughness.

Next, step S15 may be performed, in which step S12, step S13 and step S14 are repeatedly performed to obtain a desired roughness of the steel sheet, and then the rolling lubricant is sampled and grain size analysis is performed.

Next, step S16 may be performed. If the emulsifier is excessively added, the granularity of the rolling lubricating fluid is too low, so that an oil film is broken, and when rolling defects are generated, the base oil is supplemented in time, for example, the emulsifier can be added according to the concentration of 1% to dilute the emulsifier.

Next, step S2 may be performed. And (3) carrying out laboratory analysis on the rolling lubricating liquid obtained by the test, measuring the granularity, and reversely deducing the base oil formula with the expected granularity.

Finally, step S3 may be performed. Multiple steel grades, batch tests were run and the best base oil formulation was then obtained. And then, the oil factory can carry out batch production and supply the steel factory with batches.

In short, in the method for producing rolling lubricant base oil according to the example of the present invention, in the rolled state, emulsifier addition is performed to reduce the particle size and to track the steel sheet surface roughness, and when the target roughness is reached, the adjustment may be stopped. And the rolling lubricating liquid can be sampled in real time and then analyzed in a laboratory, and the base oil formula of the rolling lubricating liquid can be deduced reversely.

Fig. 3 illustrates the relationship between the lubricant stability ESI and the surface roughness of a strip rolled piece in the method for preparing a rolling lubricant base oil according to an example of the present invention.

Referring to a graph in fig. 3, the abscissa is ESI, which is an index of emulsion stability, the stability becomes better and better from 0 to 1, and the larger the granularity is, the more unstable the emulsion is, and the smaller the granularity is, the more stable the emulsion is. The corresponding steel plate roughness shows a tendency of first decreasing and then increasing. When ESI reaches about 0.8, the roughness is in an optimal state, and the granularity of the emulsion at the moment can be determined. In the example shown in fig. 3, the emulsion stability is best in the shaded area, and the roughness of the steel plate is lowest.

Tests prove that according to the preparation method of the rolling lubricating liquid base oil, the granularity of the on-site rolling lubricating liquid can be adjusted to be in an optimal use state, the test time can be controlled within 1 month, the oil supply batch can be controlled within 2 times, and the produced unqualified products can be controlled within 100 tons (5 coils).

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A preparation method of rolling lubricating liquid base oil is characterized by comprising the following steps:

step S1 is executed, wherein during rolling of rolled pieces, the granularity of the rolling lubricating fluid is adjusted to a desired use state by dynamically adjusting the granularity of the rolling lubricating fluid on a rolling site so as to obtain the rolling lubricating fluid with the desired granularity;

performing step S3, wherein a base oil is produced according to the obtained base oil formulation;

further comprising: in the execution of the step S1,

firstly, performing step S11, wherein a primary base oil having a design granularity of 20 μm is supplied to a rolling site and prepared into a primary rolling lubricant having an emulsion stability index in a range of 0.2 to 0.4;

further comprising: after the execution of the step S11,

step S12 is performed in which an appropriate number of rolled products are rolled in batches;

further comprising: in the execution of the step S12,

monitoring various rolling parameters to ensure stable rolling state, wherein the rolling parameters comprise roughness of the surface of a rolled piece, rolling force and forward slip value;

further comprising: after the execution of the step S12,

step S13 is executed, wherein, at the tail part of the rolling production line, a rolled piece sample is selected to measure the roughness of the surface of the rolled piece;

further comprising: after the execution of the step S13,

step S14 is executed, wherein, according to the measured roughness of the rolled piece surface, the granularity of the rolling lubricating liquid is adjusted,

wherein if the roughness of the surface of the rolled piece is larger, the granularity of the rolling lubricating liquid is reduced, and if the roughness of the surface of the rolled piece is smaller, the granularity of the rolling lubricating liquid is improved;

further comprising: in the execution of the step S14,

if the roughness of the surface of the rolled piece is larger, reducing the granularity of the rolling lubricating liquid by adding a proper amount of primary base oil, water and emulsifier; or

If the roughness of the surface of the rolled piece is small, the granularity of the rolling lubricating liquid is improved by adding a large amount of primary base oil and water;

further comprising: after the execution of the step S14,

step S15 is executed, wherein step S12, step S13 and step S14 are repeatedly executed to obtain a desired roughness of the rolled piece, and the rolling lubricant corresponding to the desired roughness of the rolled piece is sampled to perform graininess analysis;

further comprising: after the execution of the step S15,

performing step S16 in which, if the rolling lubricant has too small a particle size, the primary base oil is replenished in large amounts to obtain the rolling lubricant having the desired particle size;

further comprising: after the execution of the step S16,

step S17 is performed wherein steps S1 and S2 are repeated for a plurality of steel grades of rolling stock to determine an optimal rolling lubricant base oil formulation.