WO2013118235A1 - レールの冷却方法 - Google Patents
レールの冷却方法 Download PDFInfo
- Publication number
- WO2013118235A1 WO2013118235A1 PCT/JP2012/052581 JP2012052581W WO2013118235A1 WO 2013118235 A1 WO2013118235 A1 WO 2013118235A1 JP 2012052581 W JP2012052581 W JP 2012052581W WO 2013118235 A1 WO2013118235 A1 WO 2013118235A1
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- WO
- WIPO (PCT)
- Prior art keywords
- cooling
- head
- rail
- temperature
- foot
- Prior art date
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- 0 *C*1CC(CC2)CC2CCC1 Chemical compound *C*1CC(CC2)CC2CCC1 0.000 description 1
- CRINNOBNLLOHNH-UHFFFAOYSA-N CCCCCC(CCC)CC1C(C)(C)CCC1C[N+]([O-])=O Chemical compound CCCCCC(CCC)CC1C(C)(C)CCC1C[N+]([O-])=O CRINNOBNLLOHNH-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/04—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rails
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
- F27D15/02—Cooling
- F27D15/0206—Cooling with means to convey the charge
- F27D15/0213—Cooling with means to convey the charge comprising a cooling grate
Definitions
- the present invention relates to a rail cooling method for forcibly cooling the head and foot of a hot-rolled rail.
- Rails hotter than the austenite temperature after hot rolling are forcedly cooled as a heat treatment to ensure the desired quality such as hardness (hardness) required for the rail head, that is, while injecting refrigerant onto the rails May be cooled.
- This forced cooling for heat treatment (hereinafter also referred to as heat treatment cooling) is usually performed until the structure of the rail head is completely transformed from austenite to pearlite or bainite, and the cooling stop temperature is about 400 ° C. to 500 ° C. is there.
- the heat treatment cooling of the rail is usually performed from both the head side and the foot side with the rail upright.
- the heat treatment cooling for the head is for ensuring the quality such as hardness as described above.
- the heat treatment cooling for the foot is to prevent the rail from warping in the vertical direction due to the thermal stress generated due to the temperature difference between the head and the foot.
- Patent Document 1 the rail head is cooled while being injected with an injection amount that satisfies a material target, and the rail feet are adjusted to the refrigerant injection amount that corrects the curved shape of the rail.
- a cooling method is disclosed.
- Patent Document 2 discloses a method of starting the cooling of the feet before starting the cooling of the head.
- patent document 3 although cooling of a head and a foot is started simultaneously, compared with cooling of a foot, cooling of a head is strengthened and curvature is made small.
- the present invention has been made in view of the above, and an object of the present invention is to provide a rail cooling method capable of reliably suppressing warpage when the rail reaches room temperature.
- a rail cooling method is a rail cooling method for forcibly cooling a head portion and a foot portion of a hot-rolled rail,
- the cooling start temperature of the head when the forced cooling starts with respect to the head, the cooling end temperature of the head when the forced cooling ends with respect to the head, and the cooling start temperature of the foot when the forced cooling starts with respect to the foot And, based on the relationship between each temperature of the cooling end temperature of the foot when the forced cooling ends with respect to the foot, and the amount of warping of the rail when the rail reaches room temperature after the forced cooling, Calculate a target value or a target value range for each temperature at which the amount of warping of the rail at an ordinary temperature falls within an allowable range, set cooling conditions according to the target value or the target value range, and the head and the foot Strength of And performing cooling.
- the rail cooling method of the present invention has an effect of reliably suppressing warpage when the rail reaches room temperature.
- FIG. 1 is a diagram showing a main configuration of a rail production line.
- FIG. 2 is a schematic cross-sectional view illustrating the configuration of the forced cooling device.
- FIG. 3 is a block diagram illustrating a configuration example of a main control system of the forced cooling device.
- FIG. 4 is a diagram illustrating the amount of warpage of the product length of the rail.
- FIG. 5 is a diagram showing a transition curve of rail temperature during forced cooling.
- FIG. 6 is a diagram illustrating a relationship between the actual warpage amount and the predicted warpage amount.
- FIG. 7 is a flowchart showing the procedure of forced cooling.
- FIG. 1 is a diagram showing a main configuration of a rail manufacturing line 1 to which the rail cooling method of the present embodiment is applied.
- a rail production line 1 includes a finish rolling mill 2, a hot saw (hot sawing machine) 3, a forced cooling device 4 (hereinafter also referred to as a heat treatment device 4), a cooling bed 5, and the like.
- Manufactures rails (rails for railways).
- the finishing mill 2 is fed with the rail that has been processed in the previous stage, and the rail is rolled into a product cross-sectional shape by the finishing mill 2.
- the heat treatment apparatus 4 performs heat treatment (forced cooling: also simply referred to as cooling hereinafter) according to desired quality or the like on the rail after hot rolling.
- the rail is heat-treated and cooled by the heat treatment apparatus 4 and then transferred to the cooling floor 5 and cooled to about room temperature.
- FIG. 2 is a schematic cross-sectional view illustrating the configuration of the heat treatment apparatus 4.
- FIG. 3 is a block diagram illustrating a configuration example of a main control system of the heat treatment apparatus 4.
- the rail 10 after hot rolling is conveyed to the treatment position in an upright posture, and the heat treatment apparatus 4 cools the head portion 11 and the foot portion 13 of the rail 10.
- the heat treatment apparatus 4 includes a crown cooling header 41 and a head side cooling header 42 for cooling the head 11 of the rail 10, and cools the foot 13 of the rail 10.
- a foot cooling header 43 is provided.
- the head cooling header 41, the head side cooling header 42, and the foot cooling header 43 are each connected to a cooling medium source via a pipe. Then, a cooling medium such as air is ejected from a plurality of nozzles (not shown). Specifically, the parietal cooling header 41 is disposed along the longitudinal direction of the rail 10 above the head 11 of the rail 10 at the processing position, and as shown by an arrow A11 in FIG. The head 11 is cooled by spraying a cooling medium toward the head.
- the head-side cooling header 42 is disposed along the longitudinal direction of the rail 10 on both sides of the head 11 of the rail 10 at the processing position, and toward the both sides of the head 11 as indicated by an arrow A13 in FIG.
- the head 11 is cooled by jetting a cooling medium.
- the foot cooling header 43 is disposed along the longitudinal direction of the rail 10 below the foot 13 of the rail 10 at the processing position, and is directed toward the bottom surface of the foot 13 as indicated by an arrow A15 in FIG.
- the feet 13 are cooled by jetting a cooling medium.
- the heat treatment apparatus 4 includes a pair of clamping devices 45 at positions facing each other on both sides of the foot 13 of the rail 10 conveyed to the processing position.
- the pair of clamp devices 45 hold the foot 13 of the rail 10 at the processing position on both sides, and restrain the displacement so that the rail 10 during heat treatment cooling does not move in the vertical direction.
- a plurality of sets are installed at appropriate positions along the longitudinal direction of the rail 10 on both sides of the foot 13 of the rail 10.
- the heat treatment apparatus 4 is provided above the head 11 of the rail 10, and includes a head thermometer 47 that measures the temperature of the head 11 (more specifically, the temperature of the head corner (gauge corner)), and the rail 10.
- the foot thermometer 49 is provided below the foot 13 and measures the temperature of the foot 13. As shown in FIG. 3, the head thermometer 47 and the foot thermometer 49 are connected to the control unit 7 and output measured values to the control unit 7 as needed.
- the control unit 7 monitors the temperature of the head 11 and the foot 13 of the rail 10 during the heat treatment cooling, and the head cooling start temperature T h0 and the head cooling end temperature T of the head 11 described later with reference to FIG.
- the refrigerant injection from the cooling headers 41, 42, and 43 is controlled so that h1 , the foot cooling start temperature T f0 of the foot 13 and the foot cooling end temperature T f1 become the respective target values.
- the control unit 7 monitors the temperatures of the head 11 and the foot 13 of the rail 10, and stores various programs and data necessary for controlling the refrigerant injection of the cooling headers 41, 42, and 43. 8 is connected.
- the storage unit 8 includes, for example, target values for the head cooling start temperature T h0 , the head cooling end temperature T h1 , the foot cooling start temperature T f0, and the foot cooling end temperature T f1 , The actual values and the like of the temperatures T h0 , T h1 , T f0 , T f1 are accumulated and stored.
- the storage unit 8 is realized by storage devices such as various IC memories such as flash memory and RAM that can be updated and stored, a hard disk, and various storage media.
- control unit 7 is provided with an input device for inputting information necessary for the temperature monitoring and the refrigerant injection control of the cooling headers 41, 42, 43, and the rail 10 during heat treatment cooling.
- a display device or the like for monitoring and displaying the temperature of the head 11 and the foot 13 is appropriately connected.
- control part 7 contains the target temperature calculation part 71, the cooling condition setting part 73, the cooling condition correction part 75, and the cooling header control part 77 as the main function parts, as shown in FIG. .
- the target temperature calculation unit 71 calculates target values for the head cooling start temperature T h0 , the head cooling end temperature T h1 , the foot cooling start temperature T f0, and the foot cooling end temperature T f1 .
- the cooling condition setting unit 73 uses, for example, the cooling time of each of the cooling headers 41, 42, and 43 as the cooling condition based on the calculated target values of the temperatures T h0 , T h1 , T f0 , and T f1.
- the air volume of the cooling medium (air) injected from the headers 41, 42, 43 is set.
- the cooling condition correction unit 75 corrects the cooling condition based on the actual values of the temperatures T h0 , T h1 , T f0 , and T f1 acquired during operation.
- the cooling header control unit 77 controls the refrigerant injection of the cooling headers 41, 42, and 43 according to the cooling conditions set and corrected by the cooling condition setting unit 73 or the cooling condition correction unit 75.
- FIG. 4 is a diagram for explaining the warpage amount ⁇ at the product length of the rail 10.
- the maximum rise or fall amount of the top surface of the rail 10 from the straight line connecting the top surfaces of both ends of the rail 10 indicated by the one-dot chain line in FIG. 4 or the bottom surfaces of both ends of the rail 10 are connected. From the straight line (not shown), the maximum ascent or descending amount of the bottom surface of the rail 10 is defined as the warping amount ⁇ of the rail 10, and the ascending amount is represented by a negative value and the descending amount is represented by a positive value.
- FIG. 5 is a diagram showing a transition curve of the surface temperature (hereinafter simply referred to as temperature) of the rail 10 during heat treatment cooling.
- the temperature change of the head 11 is indicated by a bold line, and the temperature change of the foot 13 is indicated by a thin line.
- the coolant is injected from the foot cooling header 43 to start cooling the foot 13 first, and 15 seconds later is set as the cooling start timing of the head 11, and the parietal cooling header 41 and the head cooling header.
- the refrigerant is injected from 42 to start cooling the head 11.
- the temperature of the head 11 of the rail 10 during the heat treatment cooling is from the head cooling start temperature T h0 that is the temperature of the head 11 at the cooling start timing (15 seconds) of the head 11.
- the temperature gradually decreases and temporarily rises due to transformation heat generation, and then decreases to the head cooling end temperature Th1, which is the temperature of the head 11 at the head cooling end timing (135 seconds). Thereafter, the temperature once rises due to the recuperating action and then drops to room temperature.
- the temperature of the foot 13 is the same, and the temperature of the foot 13 of the rail 10 during heat treatment cooling is the foot cooling start temperature T f0 that is the temperature of the foot 13 at the cooling start timing (0 seconds) of the foot 13.
- T f1 the temperature of the foot 13 at the cooling end timing (135 seconds) of the foot 13
- the inventors of the present invention performed the heat treatment cooling while changing the cooling conditions, and then verified the warpage amount ⁇ at the normal temperature when the rail 10 reached the normal temperature. The relationship was found between the head cooling start temperature T h0 , the head cooling end temperature T h1 , the foot cooling start temperature T f0, the foot cooling end temperature T f1, and the warpage amount ⁇ of the rail 10 at room temperature. .
- warpage of at normal temperature ⁇ is, the formula using each temperature T h0, T h1, T f0 , T f1 , as a specific example, each temperature T h0, T h1, T f0 , T f1 It was found that it was expressed by the regression equation shown in the following equation (1) obtained by performing the regression calculation.
- the value of the constant is ⁇ 1254.
- FIG. 6 is a diagram showing the relationship between the actual warpage amount ⁇ (mm) and the predicted warpage amount ⁇ (mm).
- the actual warpage amount ⁇ is the actual warpage amount ⁇ of the rail 10 measured at normal temperature.
- the predicted warpage amount ⁇ is a regression value obtained by substituting the actual values of the respective temperatures T h0 , T h1 , T f0 , T f1 during the corresponding heat treatment into the above formula (1).
- the relationship between the actual warpage amount ⁇ and the predicted warpage amount ⁇ shows a very high correlation.
- a relational expression such as the above formula (1) is used, and ideal target values of the respective temperatures T h0 , T h1 , T f0 , T f1 at which the warpage amount ⁇ at room temperature is zero.
- the cooling conditions are set and corrected so that the temperatures Th 0 , Th 1 , T f0 , and T f1 of the head 11 and the foot 13 during heat treatment cooling become the calculated target values, and the refrigerant is injected.
- FIG. 7 is a flowchart showing a heat treatment procedure realized by the heat treatment apparatus 4.
- the heat treatment apparatus 4 performs the rail cooling method by performing each step of FIG.
- the target temperature calculation unit 71 sets the target values of the head cooling start temperature T h0 , the head cooling end temperature T h1 , the foot cooling start temperature T f0, and the foot cooling end temperature T f1 . Is calculated (step S1). Specifically, the target temperature calculation unit 71 refers to the relational expression such as the above expression (1), so that the temperatures T h0 , T h1 , T f0 , A target value of T f1 is calculated.
- the target value for the head cooling start temperature T h0 and the target value for the foot cooling start temperature T f0 need to be values that can be realized when a rail is inserted into the heat treatment apparatus 4 in an actual line. For example, since it is impossible to realize even if a temperature that is impossible from the previous operation experience is set, upper limits of T h0 and T f0 are set based on the operation results. Further, the target value of the head cooling start temperature T h0 must be set to a temperature lower than the lower limit temperature at which the necessary hardness can be imparted to the head of the rail, specifically, the temperature at which the head becomes an austenite region. There is.
- the target value of the head cooling end temperature Th1 must be set as a temperature at which the head 11 can complete transformation in order to ensure the quality required for the head 11 such as hardness. Therefore, an upper limit is set for the target value of the head cooling end temperature Th1 from the viewpoint of completing the transformation. In addition, if a too low value is set as the target value of the head cooling end temperature Th1 or the foot cooling end temperature Tf1 , the processing time in the forced cooling device (heat treatment device) becomes longer than necessary. It is preferable to provide a lower limit for the target values of T h1 and T f1 .
- the heat treatment cooling of the head portion 11 of the rail 10 is performed until the rail 10 is completely transformed in order to ensure the quality required for the head portion 11 such as hardness. For this reason, regarding the head 11, the temperature range and cooling time (cooling rate) at the time of heat treatment cooling required to ensure the target quality are determined.
- the heat treatment cooling for the foot portion 13 is for preventing the warpage of the rail 10 due to the thermal stress generated due to the temperature difference between the head portion 11 and the foot portion 13, so that the occurrence of the warpage is in an allowable range. If it can be suppressed, the cooling conditions can be adjusted to some extent.
- the target temperature calculation unit 71 adjusts the values of the foot cooling start temperature T f0 and the foot cooling end temperature T f1 so that the warpage amount ⁇ at room temperature approaches 0 as much as possible.
- target values for the temperatures T h0 , T h1 , T f0 , T f1 are calculated.
- permissible_range of the curvature here can be determined according to the manufacturing process and application use of the said rail. For example, in cases where the tolerance range of warpage allowed as a product is within the allowable range, or when the rail is straightened after heat treatment cooling as a manufacturing process, the effect of correcting the warp due to roller straightening is taken into account. In some cases, the allowable range is determined.
- the cooling condition setting unit 73 sets the cooling conditions based on the target values of the temperatures T h0 , T h1 , T f0 and T f1 calculated in step S1 (step S3). Also in this process, the cooling condition of the head 11 needs to be set so that the temperature range and the cooling time during the heat treatment cooling described above can be realized for the same reason as in step S1.
- the cooling condition setting unit 73 uses the cooling condition of the foot part 13, specifically, the cooling start / end timing of the foot cooling header 43 and / or the air volume of the cooling medium injected from the foot cooling header 43 as the cooling condition. Set.
- the cooling start / end timing is set, the foot cooling start temperature T f0 and the foot cooling end temperature T f1 in parallel with the heat treatment cooling of the head 11 based on the past operation results and the like.
- the cooling start / end timing is set so that becomes the target value.
- the air volume of the cooling medium it can be determined based on past operation results, and the air volume of the cooling medium may be set so that the temperatures T f0 and T f1 become target values.
- the treatment here is the target value of each temperature T h0 , T h1 , T f0 , T f1 calculated in step S1 from the actual value of each temperature T h0 , T h1 , T f0 , T f1 during cooling of the heat treatment. It is only necessary that the cooling conditions can be set so that both the cooling start / end timing and the air flow rate of the cooling medium may be adjusted.
- the heat treatment apparatus 4 starts the heat treatment cooling of the rail 10, and at this time, the cooling header control unit 77 controls the injection of the refrigerant in each of the cooling headers 41, 42, and 43 according to the set cooling condition (step S5).
- the control unit 7 monitors the temperatures of the head 11 and the foot 13 inputted from the head thermometer 47 and the foot thermometer 49 as needed, and the heat treatment apparatus 4 Is the rail 10 conveyed from the finishing mill 2 while the actual values of the respective temperatures T h0 , T h1 , T f0 , T f1 coincide with the target values set in step S1 (step S7: Yes).
- the heat treatment cooling is repeated with the target being sequentially processed.
- the cooling condition correcting unit 75 corrects the cooling conditions (Ste S9).
- the foot cooling start temperature T f0 and the foot cooling end temperature T f1 do not match the target values.
- the cooling condition correction unit 75 obtains a temperature difference between the target value and the actual value for the temperatures T f0 and T f1 that are determined not to match, and the cooling condition of the foot 13 is determined according to the obtained temperature difference. To correct.
- the cooling start timing is shifted forward to match the actual value to the target value.
- the target is lower than the initial cooling start timing (0 seconds) of the foot 13.
- the timing before the time corresponding to the temperature difference between the value and the actual value is corrected as the cooling start timing of the foot 13. What is necessary is just to determine the time according to a temperature difference based on the past operation performance.
- the method for correcting the cooling condition is not limited to this.
- the target values of the temperatures T h0 , T h1 , T f0 , T f1 are calculated again using the above formula (1) so that the warpage amount ⁇ at room temperature becomes 0, and the calculated target value is used as the basis.
- it may be corrected by newly setting the cooling condition in the same manner as in step S3.
- the cooling header control unit 77 controls the injection of refrigerant in each of the cooling headers 41, 42, and 43 in accordance with the corrected cooling condition (step S11). The above process is repeated until the operation is finished (step S13: No), returning to step S7.
- Example 2 Heat treatment cooling was performed according to the treatment procedure of FIG. 7, and the warpage amount ⁇ at normal temperature was verified.
- the rail material used was a 25 m long rail material (136 pounds / yard).
- the temperature after hot rolling in the finishing mill 2 is usually 900 ° C.
- the head cooling start temperature Th 0 is 720 ° C.
- the head cooling end temperature Th 1 is about 420 ° C. Therefore, the target value of the head cooling start temperature T h0 is set to 720 ° C.
- the target value of the head cooling end temperature T h1 is set to 420 ° C.
- the foot cooling start temperature T f0 and the foot portion are calculated using the above equation (1).
- the cooling start timing of the foot 13 is advanced by 10 seconds so that the coolant injection of the foot cooling header 43 is controlled so that the foot cooling start temperature T f0 becomes the target value of 680 ° C. .
- the target value of the foot cooling start temperature T f0 is changed to the actual value of 660 ° C., and the foot cooling is finished so that the warpage amount ⁇ at room temperature becomes 0 according to the above formula (1).
- the heat treatment cooling was continued as it was without correcting the cooling conditions.
- 10 rail members were each subjected to heat treatment cooling, and the amount of warpage ⁇ when each rail was at room temperature was measured.
- the warpage amount ⁇ at room temperature was within ⁇ 15 mm in both the conforming examples 1 and 2.
- the allowable range of the warp amount ⁇ is within ⁇ 20 mm, and it is well within the allowable range.
- a downward warp of ⁇ 50 m to ⁇ 70 mm was measured, and the warp amount ⁇ at room temperature was outside the allowable range.
- a press correction process for correcting the rail warpage is required for the rail whose warpage amount ⁇ is out of the allowable range as described above.
- the head cooling start temperature T h0 , the head cooling end temperature T h1 , the foot cooling start temperature T f0, and the foot portion during the predetermined heat treatment cooling According to the relationship between the cooling end temperature T f1 and the warpage amount ⁇ of the rail 10 at room temperature (for example, the above formula (1)), the ideal temperatures T h0 , T h1 , Target values of T f0 and T f1 can be calculated. Then, the cooling conditions are set so that the respective temperatures T h0 , T h1 , T f0 , T f1 of the head 11 and the foot 13 during the heat treatment cooling become the calculated target values, and the head and feet of the rail are set. Can be cooled.
- the respective temperatures T h0 , T h1 , T f0 , T f1 are set to the target values.
- the cooling conditions can be modified so that Therefore, it is possible to reliably suppress the final warpage when the rail reaches a normal temperature. This eliminates the need for a press correction process for correcting rail warping, and has the effect of improving productivity.
- the target values of the head cooling start temperature T h0 , the head cooling end temperature T h1 , the foot cooling start temperature T f0, and the foot cooling end temperature T f1 are calculated.
- the target value range of each temperature T h0 , T h1 , T f0 , T f1 may be calculated, and the cooling condition may be corrected so that the actual value falls within the target value range.
- the cooling condition for the foot 13 is set / corrected.
- the cooling condition for the head 11 may be set / corrected.
- the target values of the head cooling start temperature T h0 and the head cooling end temperature T h1 have a range
- the head cooling start temperature T h0 and the head cooling start temperature T h0 are set so as to be within the range of the width (target value range).
- the target value of the head cooling end temperature T h1 is also changed as appropriate, and the cooling conditions of the head 11, that is, the cooling start / end timing of the head cooling header 41 and the head cooling header 42, the head cooling header 41, and the head cooling.
- the air volume of the cooling medium injected from the header 42 may be set or corrected.
- Cooling header control unit 8 Storage part T h0 Head cooling start temperature T h1 Head cooling end temperature T f0 Foot cooling start temperature T f1 Foot cooling end temperature ⁇ Warp amount
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Abstract
Description
図1は、本実施の形態のレールの冷却方法を適用するレールの製造ライン1の要部構成を示す図である。図1に示すように、レールの製造ライン1は、仕上圧延機2、ホットソー(熱間鋸断機)3、強制冷却装置4(以下、熱処理装置4とも言う)、冷却床5等を含み、レール(鉄道用レール)の製造を行う。このレールの製造ライン1において、仕上圧延機2には、前段での処理を終えたレールが搬送され、レールは、この仕上圧延機2で製品断面形状に圧延される。そして、レールは、ホットソー3により先後端のクロップが切り落とされ、所定の長さに切断された後、熱処理装置4に搬送される。熱処理装置4は、熱間圧延後のレールに対して所望の品質等に応じた熱処理(強制冷却:以下単に冷却ともいう)を行うものである。レールは、この熱処理装置4によって熱処理冷却された後、冷却床5に搬送されて常温程度に冷却される。
常温での反り量δ=-1.06Th0+4.02Th1
+2.59Tf0-2.86Tf1+定数 ・・・(1)
図7の処理手順に従って熱処理冷却を行い、常温での反り量δを検証した。用いたレール材は、長さ25mのレール材(136ポンド/ヤード)とした。本レール材では、通常、仕上圧延機2での熱間圧延後の温度を900℃、頭部冷却開始温度Th0を720℃、頭部冷却終了温度Th1を420℃程度としている。そこで、頭部冷却開始温度Th0の目標値を720℃、頭部冷却終了温度Th1の目標値を420℃とし、上記式(1)を用いて、足部冷却開始温度Tf0および足部冷却終了温度Tf1の目標値を算出し、温度Tf0=680℃、温度Tf1=500℃とした。その後、レールの熱処理冷却を開始し、頭部および足部の温度を監視したところ、ある時点で足部冷却開始温度Tf0の実績値が660℃と目標値よりも低くなった。このとき、頭部冷却開始温度Th0および頭部冷却終了温度Th1の実績値は目標値とほぼ一致していた。
41 頭頂冷却ヘッダー
42 頭側冷却ヘッダー
43 足部冷却ヘッダー
45 クランプ装置
47 頭部温度計
49 足部温度計
7 制御部
71 目標温度算出部
73 冷却条件設定部
75 冷却条件修正部
77 冷却ヘッダー制御部
8 記憶部
Th0 頭部冷却開始温度
Th1 頭部冷却終了温度
Tf0 足部冷却開始温度
Tf1 足部冷却終了温度
δ 反り量
Claims (5)
- 熱間圧延されたレールの頭部および足部を強制冷却するレールの冷却方法であって、
前記頭部に対する前記強制冷却開始時の前記頭部の冷却開始温度、前記頭部に対する前記強制冷却終了時の前記頭部の冷却終了温度、前記足部に対する前記強制冷却開始時の前記足部の冷却開始温度、および前記足部に対する前記強制冷却終了時の前記足部の冷却終了温度の各温度と、前記強制冷却の後前記レールが常温となったときの前記レールの反り量との関係に基づき、前記常温時の前記レールの反り量が許容範囲内となる前記各温度の目標値または目標値範囲を算出し、
前記目標値または前記目標値範囲に従って冷却条件を設定し、前記頭部および前記足部の強制冷却を行うことを特徴とする前記レールの冷却方法。 - 前記頭部および前記足部の冷却時における前記各温度の実績値を取得し、
前記実績値が前記目標値と異なる場合または前記目標値範囲外の場合に、前記各温度が前記目標値と一致または前記目標値範囲内となるように前記冷却条件を修正して前記頭部および前記足部の強制冷却を行うことを特徴とする請求項1に記載の前記レールの冷却方法。 - 前記取得した実績値が前記目標値と異なる場合または前記目標値範囲外の場合に、前記各温度と前記反り量との関係に基づいて前記各温度のうちの少なくともひとつについて、目標値または目標値範囲を再度算出し、前記各温度が前記再度算出した前記目標値と一致または前記目標値範囲内となるように前記冷却条件を修正することを特徴とする請求項2に記載の前記レールの冷却方法。
- 前記各温度と前記反り量との前記関係は1次式で表されることを特徴とする請求項1~3のいずれか1つに記載の前記レールの冷却方法。
- 前記頭部および前記足部の強制冷却は所定の冷却媒体を用いて行い、
前記冷却条件は、少なくとも前記足部の冷却時間および/または前記足部の冷却に用いる冷却媒体量であることを特徴とする請求項1~4のいずれか1つに記載の前記レールの冷却方法。
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US14/376,652 US9429374B2 (en) | 2012-02-06 | 2012-02-06 | Rail cooling method |
JP2013540566A JP5429434B1 (ja) | 2012-02-06 | 2012-02-06 | レールの冷却方法 |
BR112014019030-5A BR112014019030B1 (pt) | 2012-02-06 | 2012-02-06 | Método de resfriamento de trilhos |
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JPS5974227A (ja) * | 1982-07-06 | 1984-04-26 | ザ・アルゴマ・スチ−ル・コ−ポレ−シヨン・リミテツド | 鉄道用レ−ルの冷却方法および冷却装置 |
JPS6160827A (ja) * | 1984-08-29 | 1986-03-28 | Nippon Steel Corp | 高温レ−ルの形状矯正冷却法 |
JP2004537649A (ja) * | 2001-08-01 | 2004-12-16 | エスエムエス メーア ゲゼルシャフト ミット ベシュレンクテル ハフツング | 工作物、特にレール鋼製の形材圧延製品の冷却方法 |
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JP3808564B2 (ja) | 1996-10-31 | 2006-08-16 | Jfeスチール株式会社 | 高温レールの冷却方法 |
JP4415735B2 (ja) | 2004-03-31 | 2010-02-17 | Jfeスチール株式会社 | 高温レールの冷却方法 |
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JPS5974227A (ja) * | 1982-07-06 | 1984-04-26 | ザ・アルゴマ・スチ−ル・コ−ポレ−シヨン・リミテツド | 鉄道用レ−ルの冷却方法および冷却装置 |
JPS6160827A (ja) * | 1984-08-29 | 1986-03-28 | Nippon Steel Corp | 高温レ−ルの形状矯正冷却法 |
JP2004537649A (ja) * | 2001-08-01 | 2004-12-16 | エスエムエス メーア ゲゼルシャフト ミット ベシュレンクテル ハフツング | 工作物、特にレール鋼製の形材圧延製品の冷却方法 |
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US9429374B2 (en) | 2016-08-30 |
JPWO2013118235A1 (ja) | 2015-05-11 |
BR112014019030B1 (pt) | 2022-09-20 |
JP5429434B1 (ja) | 2014-02-26 |
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