JP2009220116A - Lubricated rolling method and lubricated rolling apparatus of alloy - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to improve the biting ability of a material to be rolled while using the same kind of lubricating oil. <P>SOLUTION: The nose part of aluminum alloy of the material 10 to be rolled is heated with a heating furnace 2 before lubricated rolling is performed in a roughing mill 3. In this way, magnesium is segregated on the outermost layer in the nose part because of the diffusion coefficients, the easiness of generation of oxide or the like of aluminum and magnesium. Then, when the lubricating oil is used at the lubricated rolling in the roughing mill 3, the oil effect of the outermost layer in the nose part is changed and the coefficient of friction in the nose part rises. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lubrication rolling method of an alloy and a lubrication rolling apparatus for the alloy which lubricate and roll the alloy using a lubricating oil.

  2. Description of the Related Art Conventionally, lubrication rolling has been performed in which a hot rolling mill line provided with a lubricant supply device is arranged in a hot rolling line, and a material to be rolled is rolled while supplying lubricating oil to a work roll.

  It is known that the control of the lubricity in the lubrication rolling has an important influence on the surface quality of the material and the rollability. In the hot rolling (lubrication rolling) process of aluminum, etc., one type of optimum lubricating oil is usually selected in advance based on the results of various prior evaluations, and this is performed by recirculation or oil / water mixed supply. Used for lubrication rolling. In the lubricating oil, the relationship with the outermost layer of the material is important. In order to improve the lubricating performance of the lubricating oil, an oily agent, an extreme pressure agent and the like are usually added to the lubricating oil.

  Also, in many cases, one type of lubricating oil is used in the metal rolling process, and a lubricating oil supply method has been devised in order to control lubricity according to the purpose with one type of lubricating oil. ing.

  For example, in the lubricant supply method disclosed in Patent Document 1, based on the contact arc length calculated from the reduction amount and the work roll diameter, and the peripheral speed of the work roll, the lubricant supplied to the roll bite entry side The amount of supply is determined. In addition, in order to prevent the occurrence of the biting slip of the material to be rolled, when the biting of the material to be rolled is started, the supply amount of lubricant smaller than the determined supply amount is supplied to the work roll surface. It is trying to become.

JP 2006-272379 A

  In lubrication rolling, as described in Patent Document 1, it is desired to improve the biting property of the material to be rolled. Therefore, it is conceivable to improve the biting performance by dropping the lubricating oil only at the tip portion where biting is started, but in this case, it is necessary to temporarily change the rolling speed and oil supply amount, and After the leading end of the rolled material is caught, it is necessary to return to the normal rolling speed and oil supply amount, and the production efficiency is very poor.

  In addition, it is conceivable to use multiple types of lubricating oil as needed, but the use of lubricating oil is complicated, and even if lubricating oil is used properly, recirculation becomes difficult due to the mixing of lubricating oils. Become.

  Therefore, it is desired to improve the biting property of the material to be rolled without reducing the lubricity of the steady portion of the material to be rolled by supplying the same type of lubricating oil.

  An object of the present invention is to provide an alloy lubrication rolling method and an alloy lubrication rolling apparatus capable of improving the biting property of a material to be rolled while using the same type of lubricating oil.

Means and effects for solving the problems

  The lubrication rolling method of the alloy of the present invention is a lubrication rolling method of an alloy that lubricates and rolls an alloy with a minor component added as a main component using a lubricating oil, and before the lubrication rolling, the alloy is specified. The subcomponent is segregated in the outermost layer of the specific portion by heating the portion.

  According to the above configuration, the specific part of the alloy that is the material to be rolled, for example, the tip of the alloy is heated before lubrication rolling, so that the diffusion coefficient of the main component and subcomponents and the oxide Due to the ease of generation, the subcomponents are segregated on the outermost layer of the specific portion. Thereby, when lubricating oil is used at the time of lubrication rolling, the oily effect of the outermost layer of a specific part is changed, and the friction coefficient of a specific part becomes high. Therefore, by making the part that requires biting property a specific part, while using the same type of lubricating oil, without reducing the lubricity of the steady part, that is, the surface property and rolling property of the steady part. While maintaining, the biting property of the alloy as the material to be rolled can be improved.

  In the lubricating rolling method for an alloy of the present invention, the main component may be aluminum. According to the above configuration, by making the main component of the alloy aluminum, the subcomponents are preferably segregated on the outermost layer of the heated specific portion from the diffusion coefficient of aluminum, the ease of oxide formation, etc. Can do.

  In the lubricating rolling method for an alloy of the present invention, the lubricating oil may contain one or more of an ester, a fatty acid, and an alcohol. According to said structure, when the lubricating oil contains oil-based agents, such as ester, the friction coefficient in the heated specific part can be improved suitably.

  In the lubricating rolling method for an alloy of the present invention, the heating temperature of the specific portion may be 420 ° C. or higher and 620 ° C. or lower. According to said structure, a subcomponent can fully be segregated to the outermost layer of a specific part by heating the specific part of an alloy at 420 to 620 degreeC, Preferably it is 480 to 540 degreeC.

In the lubricating rolling method of the alloy of the present invention, the component amount of the main component is M ₁ (wt%) and the component amount of the sub component is M ₂ (wt%) in the outermost layer of the specific portion after heating. Then, the relationship of M ₂ / M ₁ > 0.4 may be satisfied. According to the arrangement, so as to satisfy the relation of _M 2 _/ M 1> _0.4, that is segregated the outermost layer to the sub-components of the particular portion, it is possible to sufficiently increase the coefficient of friction of a particular part.

  In the lubricating rolling method for an alloy of the present invention, the subcomponent may be one or more of magnesium, manganese, zinc, copper, and silicon. According to said structure, a subcomponent can be suitably segregated in the outermost layer of the heated specific part because the alloy contains subcomponents, such as magnesium.

  In the lubrication rolling method for an alloy of the present invention, the specific portion may be a front end portion and / or a rear end portion of the alloy. According to said structure, the biting property of the alloy which is a to-be-rolled material is improved suitably by heating the location where biting property, such as the front-end | tip part and / or rear end part of an alloy, is requested | required as a specific part. be able to.

  Further, the lubrication rolling device of the alloy of the present invention is a lubrication rolling device of an alloy that lubricates and rolls an alloy having a minor component added as a main component using a lubricating oil, and a lubrication rolling means for performing the lubrication rolling, And a heating means provided on the upstream side of the lubrication rolling means for heating the specific portion so that the subcomponent segregates on the outermost layer of the specific portion of the alloy.

  According to the above configuration, before the lubrication rolling is performed in the lubrication rolling means, the specific part of the alloy as the material to be rolled, for example, the tip of the alloy is heated by the heating means, so that the main component and the subcomponent Subcomponents are segregated in the outermost surface layer of the specific portion because of the diffusion coefficient of the oxide and the ease of oxide formation. Thereby, when lubricating oil is used at the time of the lubricating rolling in the lubricating rolling means, the oily effect of the outermost layer of the specific portion is changed, and the friction coefficient of the specific portion is increased. Therefore, by making the part that requires biting property a specific part, while using the same type of lubricating oil, without reducing the lubricity of the steady part, that is, the surface property and rolling property of the steady part. While maintaining, the biting property of the alloy as the material to be rolled can be improved.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an alloy lubrication rolling method and an alloy lubrication rolling apparatus according to the present invention will be described with reference to the drawings.

(Configuration of lubrication rolling device 1)
As shown in FIG. 1, an alloy lubrication rolling apparatus (hereinafter referred to as a lubrication rolling apparatus) 1 according to the present embodiment lubricates and rolls an alloy using a lubricating oil. In the present embodiment, a description will be given assuming that a 5000 series aluminum alloy containing aluminum as a main component and magnesium as a subcomponent is used as the material to be rolled 10. In the present embodiment, the lubricating oil contains an oily agent such as oleic acid.

  As shown in FIG. 1, the lubrication rolling device 1 has a heating furnace 2 as a heating means for heating the material to be rolled 10 on the upstream side, and performs lubrication rolling (coarse mill) on the downstream side of the heating furnace 2. A rough rolling mill 3 is provided as a rolling means. A finish rolling mill (not shown) that performs lubrication rolling (finishing mill) is provided on the downstream side of the rough rolling mill 3.

  Conveying means (not shown) for conveying the material to be rolled 10 is provided between the heating furnace 2 and the roughing mill 3 and between the roughing mill 3 and the finish rolling mill. In addition, this conveyance means may be configured by connecting a plurality of drive rolls or free rolls.

  The heating furnace 2 hot-charges the material 10 to be rolled before lubrication rolling (in a state where the material is heated to a temperature higher than room temperature), but in this embodiment, hot-charging is performed. In addition to the configuration, a position sensor 31 that detects the position of a specific portion (the tip portion in the present embodiment) of the material 10 to be rolled, a temperature sensor 32 that detects the temperature of the tip portion of the material 10 to be rolled, and the material to be rolled And a burner 33 for heating the tip of the material 10.

  Here, in the aluminum alloy to which magnesium is added, magnesium is concentrated in the outermost layer of the aluminum alloy because magnesium is more easily oxidized than aluminum and the diffusion coefficient of magnesium is larger than that of aluminum. Is known to happen. The heating furnace 2 of the present embodiment is configured to forcibly segregate magnesium, which is a secondary component, on the outermost layer of the tip by heating the tip of the material 10 to be rolled, which is an aluminum alloy, with a burner 33. ing. Here, the outermost layer refers to a portion having a depth of 0.2 μm from the surface of the material to be rolled 10.

  Operations other than hot charging in the heating furnace 2 are controlled by the control device 50. The control device 50 includes a CPU 51, a ROM (Read Only Memory) 52, a RAM (Random Access Memory) 53, an interface circuit 54, a timer 55, and a heating control circuit 56 that controls the burner 33.

  The CPU 51 controls operations other than hot charging in the heating furnace 2. The ROM 52 stores programs executed by the CPU 51, data used permanently, and the like. The RAM 53 temporarily stores data and programs used when the CPU 51 performs processing. For example, the position of the tip portion of the material to be rolled 10, the time elapsed since the start of heating by the burner 33, and the temperature of the tip portion of the material to be rolled 10 are stored.

  The CPU 51 positions the tip of the material to be rolled 10 directly above the burner 33 based on a signal input from the position sensor 31 via the interface circuit 54. Then, the CPU 51 controls the heating control circuit 56 to heat the tip of the material to be rolled 10 with the burner 33 at a predetermined temperature until a predetermined time has elapsed. In the present embodiment, the predetermined temperature is 420 ° C. or higher and 620 ° C. or lower, preferably 480 ° C. or higher and 540 ° C. or lower. Moreover, in this Embodiment, predetermined time is 1 hour or more.

  Further, the CPU 51 controls the heating control circuit so as to keep the temperature of the tip portion of the material to be rolled 10 at a predetermined temperature based on a signal input from the temperature sensor 32 via the interface circuit 54 while heating is performed. 56 is controlled. When the CPU 51 determines that a predetermined time has elapsed based on the signal from the timer 55, the CPU 51 controls the heating control circuit 56 to stop heating by the burner 33.

  The rough rolling mill 3 includes a pair of work rolls 42 that sandwich the material 10 to be rolled down with a predetermined rolling load, a pair of backup rolls 41 that reinforce the reduction by the work rolls 42, and a surface of the work roll 42. A spray nozzle 43 for injecting lubricating oil and a motor (not shown) for rotating the work roll 42 are provided. First, the to-be-rolled material 10 is bitten by a pair of work rolls 42 and is lubricated (coarse milled) from the front end to the rear end by the rotation of the work roll 42. In addition, the rough-rolled material 10 is lubricated and rolled to a desired plate thickness (finishing mill) by being reciprocated many times in a finishing mill having a plurality of pairs of work rolls and a plurality of backup rolls. Is done.

(Operation of the lubricating rolling device 1)
Next, the operation of the lubricating rolling apparatus 1 will be described using the lubricating rolling processing routine of FIG. First, the material to be rolled 10 is put into the heating furnace 2 (S1). And as shown in FIG. 1, it positions so that the front-end | tip part of the to-be-rolled material 10 may be just above the burner 33 (S2). Next, the tip of the material to be rolled 10 is heated by the burner 33 at a predetermined temperature until a predetermined time elapses (S3). As a result, magnesium that is more easily oxidized than aluminum and has a larger diffusion coefficient than aluminum is segregated on the outermost surface layer of the tip.

Here, when the aluminum component amount is M ₁ (wt%) and the magnesium component amount is M ₂ (wt%), M ₂ / M ₁ > The relationship of 0.4 is satisfied.

  Thereafter, hot rolling of the material to be rolled 10 is performed (S4). In addition, you may cool the front-end | tip part of the to-be-rolled material 10 before performing a hot charge. Further, the order of the hot charge in S4 and the heating of the tip of the material to be rolled 10 in S3 may be reversed. Then, the heated material to be rolled 10 is sent out toward the roughing mill 3, and lubrication rolling (rough mill) is performed in the roughing mill 3 (S5). Lubrication rolling (coarse mill) is performed by holding the material to be rolled 10 between a pair of work rolls 42 and transporting the material 10 toward the downstream side while being reduced by a predetermined rolling load. Lubricating oil is sprayed from the spray nozzle 43 onto the surface of the work roll 42 during lubrication rolling.

  Here, since the tip of the material to be rolled 10 is first heated in the heating furnace 2 and magnesium is segregated in the outermost layer of the tip, the oily effect of the outermost layer of the tip changes, The friction coefficient is high. Thereby, since the biting property of the tip portion is improved, the bit of the tip portion of the material to be rolled 10 by the pair of work rolls 42 is smoothly performed.

  Thus, before lubrication rolling is performed, the tip of the aluminum alloy as the material to be rolled 10 is heated, so that the tip of the tip can be obtained from the diffusion coefficient of aluminum and magnesium, the ease of formation of oxides, and the like. Magnesium is segregated on the outermost layer. Thereby, when lubricating oil is used at the time of lubrication rolling, the oily effect of the outermost layer of a front-end | tip part is changed, and the friction coefficient of a front-end | tip part becomes high. Therefore, while using the same type of lubricating oil, the lubricity of the aluminum alloy that is the material to be rolled 10 is maintained without reducing the lubricity of the steady portion, that is, while maintaining the surface property and rolling property of the steady portion. Can be improved.

  In addition, when aluminum is used as the main component of the alloy, magnesium can be suitably segregated in the outermost layer of the heated tip due to the diffusion coefficient of aluminum and the ease of oxide formation.

  The lubricating oil contains an oily agent such as oleic acid. Thereby, as will be described in the test results described later, the friction coefficient at the tip of the heated material to be rolled 10 can be suitably increased.

  Moreover, the front-end | tip part of the to-be-rolled material 10 is heated at 420 to 620 degreeC, Preferably it is 480 to 540 degreeC. Thereby, as described in the test results described later, magnesium can be sufficiently segregated in the outermost surface layer of the tip portion.

Moreover, as will be described in the test results described later, the friction coefficient of the tip is sufficiently increased by segregating magnesium in the outermost layer of the tip so as to satisfy the relationship of M ₂ / M ₁ > 0.4. Can do.

  Moreover, magnesium can be segregated suitably in the outermost layer of the heated front-end | tip part because the aluminum alloy which is the to-be-rolled material 10 contains magnesium as a subcomponent.

  Moreover, the biting property of the aluminum alloy which is the to-be-rolled material 10 can be suitably improved by heating the front-end | tip part of the to-be-rolled material 10 in which biting property is requested | required.

  Thereafter, the material to be rolled 10 is sent to a finishing mill, and finish rolling (finishing mill) is performed in the finishing mill (S6). Then, this routine ends.

  In addition, even if the heating of the front-end | tip part of the to-be-rolled material 10 is the structure performed after the lubrication rolling (coarse mill) in the rough rolling mill 3, and before the finish rolling (finishing mill) in a finish rolling mill. Good. Even with such a configuration, the end portion of the material to be rolled 10 can be smoothly bitten in the finish rolling mill.

  Further, the rear end portion of the material to be rolled 10 may also be configured such that magnesium is segregated to the outermost layer of the rear end portion by being heated by the burner 33 in the same manner as the front end portion. Moreover, the structure by which only the rear-end part of the to-be-rolled material 10 is heated with the burner 33 may be sufficient. In the finishing rolling mill in which the material 10 is reciprocated many times by segregating magnesium on the outermost surface layer of the rear end, not only the front end of the material 10 but also the rear end of the material 10 Can be smoothly carried out.

(Friction coefficient measurement results)
FIG. 3 shows the measurement result of the friction coefficient. In this test, the friction coefficient of the aluminum alloy in dodecane was measured before and after the heat treatment using an aluminum alloy (A5182) containing magnesium as a subcomponent and using dodecane as a lubricating oil. Further, oleic acid or ester (butyl stearate) was used as an oily agent, and the friction coefficient of the aluminum alloy in dodecane added with 5 wt% of this was measured before and after the heat treatment. Heating was performed at 540 ° C. for 7 hours. The coefficient of friction was measured using a ball-on-disk friction and wear tester manufactured by Takachiho Seiki.

  As shown in FIG. 3, when oleic acid or ester was added to dodecane, an effect of reducing the friction coefficient was observed in an aluminum alloy that was not subjected to heat treatment. On the other hand, there was almost no difference in the coefficient of friction in the heat-treated aluminum alloy. From this, it can be seen that in the lubricating oil to which the oil-based agent is added, the friction coefficient is higher in the heat-treated aluminum alloy than in the heat-treated aluminum alloy. The oily agent may be a fatty acid or alcohol other than oleic acid.

(Surface composition analysis results)
Table 1 shows the analysis results of the surface composition. In this test, an aluminum alloy containing magnesium as an accessory component was used, and the metal composition of the outermost layer of the aluminum alloy not subjected to the heat treatment (a portion having a depth of 0.2 μm from the surface of the aluminum alloy) and the heat treatment were performed. The metal composition of the outermost layer of the aluminum alloy was measured. Heating was performed at 540 ° C. for 7 hours. The metal composition on the surface was measured using an ESEM-2700 / EDAX low vacuum scanning electron microscope manufactured by Nikon at an acceleration voltage of 5 kV and a magnification of 100 times.

  It can be seen that the magnesium ratio (wt%) in the outermost layer of the heated portion of the aluminum alloy is greatly increased by the heat treatment.

  FIG. 4 shows the results of measuring the ratio of aluminum and magnesium in the outermost layer of the heated portion of the aluminum alloy with different heating conditions. In the aluminum alloy (unheated material) that was not heat-treated, the proportion of magnesium was less than 10%. On the other hand, in the aluminum alloy (420 ° C. × 1 h) at 420 ° C. for 1 hour, the magnesium ratio was 30% or more. In the aluminum alloy (540 ° C. × 7 h (1), 540 ° C. × 7 h (2)) for 7 hours at 540 ° C., the magnesium ratio is 60% in the first time (540 ° C. × 7 h (1)). Although it was above, in the 2nd time (540 degreeC x 7 h (2)), the ratio of magnesium was 30% or more, and the heating conditions were 420 degrees C and the aluminum alloy for 1 hour was not a big difference.

  Here, the upper limit of the heating temperature of the aluminum alloy is 620 ° C. This is because if the heating temperature of the aluminum alloy is 620 ° C. or more, the aluminum component is softened, so that the magnesium component is less likely to segregate on the outermost layer of the heated portion. Therefore, by setting the heating temperature of the aluminum alloy to 420 ° C. or more and 620 ° C. or less, the magnesium component is suitably segregated on the outermost layer of the heated portion. The heating temperature of the aluminum alloy is preferably 480 ° C. or higher and 540 ° C. or lower. If heating temperature is 480 degreeC or more, as shown in FIG. 4, a magnesium component will segregate to the outermost layer of a to-be-heated part 50% or more. Moreover, if a heating temperature is 540 degrees C or less, the to-be-heated part of an aluminum alloy can be heated suitably. From the above, if the aluminum alloy is heated at 420 ° C. or higher and 620 ° C. or lower, preferably 480 ° C. or higher and 540 ° C. or lower for 1 hour or longer, the magnesium component can be sufficiently segregated in the outermost layer of the heated portion. Recognize.

FIG. 5 is a graph in which the graph of FIG. 4 is represented by the ratio of Mg / Al. In an aluminum alloy not subjected to heat treatment (unheated material), the ratio of Mg / Al is less than 0.1, whereas in an aluminum alloy (420 ° C. × 1 h) at 420 ° C. for 1 hour, The ratio of Mg / Al is 0.4 or more. From this, when the component amount of aluminum is M ₁ (wt%) and the component amount of magnesium is M ₂ (wt%), the magnesium component is set so as to satisfy the relationship of M ₂ / M ₁ > 0.4. It can be seen that the friction coefficient of the heated portion can be sufficiently increased by segregating on the outermost surface layer of the heated portion.

(Outline of this embodiment)
As described above, the lubrication rolling method of the alloy according to the present embodiment is a lubrication rolling method of an alloy that lubricates and rolls an alloy having a minor component added as a main component using a lubricating oil, and before the lubrication rolling is performed. In addition, by heating a specific portion of the alloy, the secondary component is segregated in the outermost layer of the specific portion.

  According to the above configuration, the specific part of the alloy that is the material to be rolled, for example, the tip of the alloy is heated before lubrication rolling, so that the diffusion coefficient of the main component and subcomponents and the oxide Due to the ease of generation, the subcomponents are segregated on the outermost layer of the specific portion. Thereby, when lubricating oil is used at the time of lubrication rolling, the oily effect of the outermost layer of a specific part is changed, and the friction coefficient of a specific part becomes high. Therefore, by making the part where biting property is required a specific part, while using the same type of lubricating oil, without reducing the lubricity of the steady part, that is, the surface property and rolling property of the steady part. While maintaining, the biting property of the alloy as the material to be rolled can be improved.

  In the lubrication rolling method of the alloy of the present embodiment, the main component is aluminum. According to the above configuration, by making the main component of the alloy aluminum, the subcomponents are preferably segregated on the outermost layer of the heated specific portion from the diffusion coefficient of aluminum, the ease of oxide formation, etc. Can do.

  Moreover, in the lubrication rolling method of the alloy of this Embodiment, it is set as the structure in which lubricating oil contains one or more of ester, a fatty acid, and alcohol. According to said structure, when the lubricating oil contains oil-based agents, such as ester, the friction coefficient in the heated specific part can be improved suitably.

  In the lubrication rolling method of the alloy according to the present embodiment, the heating temperature of the specific portion is set to 420 ° C. or more and 620 ° C. or less. According to said structure, a subcomponent can fully be segregated to the outermost layer of a specific part by heating the specific part of an alloy at 420 to 620 degreeC, Preferably it is 480 to 540 degreeC.

In the lubrication rolling method of the alloy of the present embodiment, the component amount of the main component is M ₁ (wt%) and the component amount of the sub component is M ₂ (wt%) in the outermost layer of the specific portion after heating. When _is the structure that meets the relation of M ₂ / M 1> 0.4. According to the arrangement, so as to satisfy the relation of _M 2 _/ M 1> _0.4, that is segregated the outermost layer to the sub-components of the particular portion, it is possible to sufficiently increase the coefficient of friction of a particular part.

  Moreover, in the lubrication rolling method of the alloy of this Embodiment, it is set as the structure whose subcomponent is one or more of magnesium, manganese, zinc, copper, and silicon. According to said structure, a subcomponent can be suitably segregated in the outermost layer of the heated specific part because the alloy contains subcomponents, such as magnesium.

  Further, in the lubrication rolling method of the alloy of the present embodiment, the specific portion is configured to be the front end portion and / or the rear end portion of the alloy. According to said structure, the biting property of the alloy which is a to-be-rolled material is improved suitably by heating the location where biting property, such as the front-end | tip part and / or rear end part of an alloy, is requested | required as a specific part. be able to.

  Further, the lubrication rolling apparatus for alloy according to the present embodiment is a lubrication rolling apparatus (lubricating rolling apparatus 1) that lubricates and rolls an alloy (substance to be rolled 10 or the like) in which a minor component is added as a main component using a lubricating oil. Etc.), which is provided with lubrication rolling means (rough rolling mill 3 etc.) for carrying out lubrication rolling, and a specific part so that subcomponents are segregated on the outermost layer of the specific part of the alloy. And heating means (heating furnace 2 or the like) for heating.

  According to the above configuration, before the lubrication rolling is performed in the lubrication rolling means, the specific part of the alloy that is the material to be rolled 10, for example, the tip of the alloy is heated by the heating means, so Subcomponents are segregated in the outermost layer of the specific portion due to the diffusion coefficient of the components and the ease of formation of oxides. Thereby, when lubricating oil is used at the time of the lubricating rolling in the lubricating rolling means, the oily effect of the outermost layer of the specific portion is changed, and the friction coefficient of the specific portion is increased. Therefore, by making the part that requires biting property a specific part, while using the same type of lubricating oil, without reducing the lubricity of the steady part, that is, the surface property and rolling property of the steady part. The biting property of the alloy which is the material to be rolled 10 can be improved while maintaining.

(Modification of this embodiment)
As mentioned above, although the Example of this invention was described, it only showed the specific example and does not specifically limit this invention, A specific structure etc. can change a design suitably. Further, the actions and effects described in the embodiments of the present invention only list the most preferable actions and effects resulting from the present invention, and the actions and effects according to the present invention are described in the embodiments of the present invention. It is not limited to what was done.

  For example, the aluminum alloy in the present embodiment may contain one or more of manganese, zinc, copper, and silicon as subcomponents instead of magnesium. When the aluminum alloy contains the subcomponent, the subcomponent can be suitably segregated on the surface of the specific portion in the heated specific portion.

  Further, the alloy in the present embodiment is mainly composed of aluminum, but if the subcomponent is segregated to the outermost layer by heating and the friction coefficient in the heated part becomes high, even a metal other than aluminum can be used. Good.

  Moreover, in the lubrication rolling apparatus 1 in the present embodiment, the heating furnace 2 is configured to heat the material to be rolled 10 and to heat the tip portion of the material to be rolled 10. The heating furnace and the heating means for heating the tip of the material to be rolled 10 may be separate.

  Further, the lubrication rolling method of the alloy in the present embodiment is applied to lubrication rolling, but it can be used as a method of partially changing lubricity with the same material in metal processing other than rolling such as pressing. . That is, lubrication control can be facilitated by segregating the subcomponents on the outermost layer of the heated portion as necessary to change the oily effect of the outermost layer.

The figure which shows the structure of a lubrication rolling apparatus. The flowchart of a lubrication rolling process routine. The graph which shows the measurement result of a friction coefficient. The graph which shows the measurement result of the ratio of aluminum and magnesium. The graph which represented the graph of FIG. 4 by ratio of Mg / Al.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lubrication apparatus 2 Heating furnace 3 Rough rolling mill 10 Rolled material 31 Position sensor 32 Temperature sensor 33 Burner 41 Backup roll 42 Work roll 43 Spray nozzle 50 Control apparatus 51 CPU
52 ROM
53 RAM
54 interface circuit 55 timer 56 heating control circuit

Claims (8)

A lubrication rolling method of an alloy in which an alloy with a minor component added to a main component is lubricated and rolled using a lubricating oil,
A method of lubricating rolling an alloy, comprising: heating the specific portion of the alloy before performing the lubricating rolling to segregate the subcomponent in the outermost layer of the specific portion.   2. The method of lubricating rolling an alloy according to claim 1, wherein the main component is aluminum.   The lubricating rolling method for an alloy according to claim 1 or 2, wherein the lubricating oil contains one or more of an ester, a fatty acid, and an alcohol.   The method of lubricating rolling of an alloy according to any one of claims 1 to 3, wherein the heating temperature of the specific portion is 420 ° C or higher and 620 ° C or lower. In the outermost layer of the specific portion after the heating, if the component amount of the main component is M ₁ (wt%) and the component amount of the sub component is M ₂ (wt%), a relationship of M ₂ / M ₁ > 0.4 5. The method of lubricating rolling an alloy according to claim 1, wherein:   6. The method of lubricating rolling an alloy according to claim 1, wherein the subcomponent is one or more of magnesium, manganese, zinc, copper, and silicon.   The lubricating rolling method for an alloy according to any one of claims 1 to 6, wherein the specific portion is a front end portion and / or a rear end portion of the alloy. A lubricating rolling device for an alloy that lubricates and rolls an alloy having a minor component added to a main component using a lubricating oil,
Lubricating rolling means for performing the lubricating rolling;
A heating unit that is provided on the upstream side of the lubrication rolling unit and heats the specific part so that the subcomponent is segregated in the outermost layer of the specific part of the alloy;
An apparatus for lubricating rolling of an alloy characterized by comprising:

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