WO2013118236A1 - 軌条熱処理装置および軌条熱処理方法 - Google Patents
軌条熱処理装置および軌条熱処理方法 Download PDFInfo
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- WO2013118236A1 WO2013118236A1 PCT/JP2012/052582 JP2012052582W WO2013118236A1 WO 2013118236 A1 WO2013118236 A1 WO 2013118236A1 JP 2012052582 W JP2012052582 W JP 2012052582W WO 2013118236 A1 WO2013118236 A1 WO 2013118236A1
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- Prior art keywords
- rail
- cooling
- cooling time
- heat treatment
- hardness
- Prior art date
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- 0 *CC1=CC(CCC2)CC2CCC=CC/C=C1 Chemical compound *CC1=CC(CCC2)CC2CCC=CC/C=C1 0.000 description 1
- UESRVKWXTHNZEM-UHFFFAOYSA-N CC1CCCC(CC2)CCC2CCCC1 Chemical compound CC1CCCC(CC2)CCC2CCCC1 UESRVKWXTHNZEM-UHFFFAOYSA-N 0.000 description 1
- NJNBQDDBJLDLEH-UHFFFAOYSA-N CCNC1NC1 Chemical compound CCNC1NC1 NJNBQDDBJLDLEH-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
-
- 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
- C21D1/667—Quenching devices for spray quenching
-
- 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
-
- 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
-
- 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
- C21D2221/00—Treating localised areas of an article
Definitions
- the present invention relates to a rail heat treatment apparatus and a rail heat treatment method for cooling a rail.
- the rail heat treatment apparatus includes a device that supports and restrains a foot portion of a rail to be cooled, a cooling header that injects a cooling medium onto the rail that is supported and restrained by the support and restraint device, and the support and restraint device or the cooling header. And an oscillation mechanism for oscillating (reciprocating) in the longitudinal direction of the rail (see Patent Documents 1 and 2).
- a plurality of cooling headers for cooling the sole portion of the rail are arranged below the rail support position.
- the plurality of cooling headers are arranged in a discontinuous state at a predetermined interval from each other along the rail longitudinal direction.
- a discontinuous portion causes a rail portion in which the cooling medium from the cooling header does not sufficiently hit in the rail to be cooled.
- uneven cooling of the rail occurs along the longitudinal direction of the rail.
- the cooling header injects the cooling medium onto the rail to be cooled, and the oscillation mechanism makes the rail and the cooling header relatively relative to each other along the rail longitudinal direction. Is oscillating.
- the cooling medium is jetted from the cooling header to the object to be cooled (railway or steel material), and the technique of relatively oscillating the object to be cooled and the cooling header is limited.
- an object of the present invention is to provide a rail heat treatment apparatus and a rail heat treatment method capable of suppressing the unevenness in the hardness of the rail in the rail longitudinal direction and ensuring the quality of the rail uniform in the rail longitudinal direction.
- the rail heat treatment apparatus includes a cooling header that injects a cooling medium onto the rail to be cooled, and the rail and the rail along the longitudinal direction of the rail.
- An oscillation mechanism that reciprocally moves the cooling header; and a control system that performs oscillation control on the oscillation mechanism.
- the control system stores information necessary for the oscillation control. And an allowable range of the required cooling time of the rail satisfying an allowable range of the hardness of the rail, based on a correlation equation indicating a correlation between the cooling time of the rail by the cooling header and the hardness of the rail after cooling.
- the stroke and speed of the relative reciprocation between the rail and the cooling header are controlled based on the allowable range of the required cooling time, and the stroke Characterized in that the reciprocating operation of the over-click and speed and a control unit to be executed by said oscillation mechanism.
- a plurality of the cooling headers are arranged discontinuously at predetermined intervals along the longitudinal direction of the rail, and the control system includes a plurality of control systems. Calculate the minimum cooling time of the rail that decreases due to the discontinuity between the cooling headers, and the rail and the rail so that the minimum cooling time is within the allowable range of the required cooling time. Controlling the stroke and speed of the reciprocating motion relative to the cooling header.
- the control system calculates a cooling time range of the rail that satisfies an allowable range of the hardness of the rail based on the correlation equation, and the cooling system The required cooling time is determined from a time range.
- the rail heat treatment apparatus is the above invention, wherein the cooling apparatus having the plurality of cooling headers arranged along the longitudinal direction of the rail and the rail before cooling are carried into the cooling apparatus. And a transfer device for carrying out the cooled rail from the same side as the rail carrying-in side with respect to the cooling device.
- the rail heat treatment apparatus in the above invention, carries the cooling device having a plurality of the cooling headers arranged along the longitudinal direction of the rail, and the rail before cooling into the cooling device.
- the rail heat treatment method according to the present invention is based on a correlation equation that indicates a correlation between a cooling time for cooling the rail by injecting a cooling medium from the cooling header onto the rail to be cooled and the hardness of the rail after cooling. Determining the allowable range of the required cooling time of the rail that satisfies the allowable range of the hardness of the rail, controlling the stroke and speed of the reciprocating operation based on the allowable range of the required cooling time, and in the longitudinal direction of the rail The reciprocating operation of the stroke and the speed is performed as a relative reciprocating operation between the rail along the rail and the cooling header.
- the rail heat treatment method according to the present invention is the above invention, wherein the length of the discontinuous portions between the plurality of cooling headers arranged discontinuously at predetermined intervals along the longitudinal direction of the rail is determined.
- the minimum value of the cooling time of the rail that decreases due to the discontinuous portion is calculated, and the rail and the rail are set so that the minimum value of the cooling time falls within the allowable range of the required cooling time. Controlling the stroke and speed of the reciprocating motion relative to the cooling header.
- the rail heat treatment method according to the present invention is the above invention, wherein the rail cooling time range satisfying the rail hardness tolerance is calculated based on the correlation equation, and the rail cooling time range is calculated from the cooling time range. The required cooling time is determined.
- the rail heat treatment method according to the present invention is the above invention, wherein the rail before cooling is carried into a cooling device having a plurality of the cooling headers arranged along the longitudinal direction of the rail, The rail after cooling is carried out from the same side as the rail loading side with respect to the cooling device.
- the rail heat treatment method according to the present invention is the above-described invention, wherein the rail before cooling is used as the cooling device for the cooling device having a plurality of the cooling headers arranged along the longitudinal direction of the rail. It carries in, The said rail after cooling by the said cooling device is carried out from the opposite side to the loading side of the said rail in the said cooling device.
- the relative oscillation speed and stroke between the rail and the cooling header can be optimized corresponding to the distance of the discontinuous portion between the cooling headers, and thereby the hardness of the rail in the longitudinal direction of the rail.
- the effect of suppressing unevenness and ensuring uniform rail quality in the longitudinal direction of the rail is achieved.
- FIG. 1 is a block diagram showing a schematic configuration of a rail manufacturing line including a rail heat treatment apparatus according to an embodiment of the present invention.
- FIG. 2 is a schematic diagram showing a configuration example of the rail heat treatment apparatus according to the embodiment of the present invention.
- FIG. 3 is a schematic diagram illustrating a configuration example of the cooling header of the rail heat treatment apparatus according to the present embodiment.
- FIG. 4 is a diagram for explaining the cooling time of the rail affected by the discontinuity between the cooling headers.
- FIG. 5 is a schematic diagram showing a correlation between the position of the oscillation end and the cooling time of the rail portion.
- FIG. 6 is a schematic diagram showing a specific example of the correlation between the rail cooling time and the hardness of the rail after cooling.
- FIG. 1 is a block diagram showing a schematic configuration of a rail manufacturing line including a rail heat treatment apparatus according to an embodiment of the present invention.
- FIG. 2 is a schematic diagram showing a configuration example of the rail heat treatment apparatus according to the embodiment of the present
- FIG. 7A is a schematic diagram showing a specific example of the correlation between the cooling time and the hardness of the rail depending on the header interval.
- FIG. 7B is a schematic diagram illustrating a specific example of the correlation between the cooling time of the rail depending on the header interval and the hardness, and is an example in a case where an oscillation stroke different from that in FIG. 7A is employed.
- FIG. 8A is a schematic diagram showing another specific example of the correlation between the cooling time and the hardness of the rail depending on the header interval.
- FIG. 8B is a schematic diagram illustrating another specific example of the correlation between the cooling time and the hardness of the rail depending on the header interval, and is an example in a case where an oscillation stroke different from that in FIG. 8A is employed.
- FIG. 9 is a schematic view showing a modification of the rail heat treatment apparatus according to the embodiment of the present invention.
- FIG. 1 is a block diagram illustrating a schematic configuration of a rail manufacturing line including a rail heat treatment apparatus according to an embodiment of the present invention.
- FIG. 2 is a schematic diagram showing a configuration example of the rail heat treatment apparatus according to the embodiment of the present invention.
- FIG. 3 is a schematic diagram illustrating a configuration example of the cooling header of the rail heat treatment apparatus according to the present embodiment.
- the rail manufacturing line 1 includes a finish rolling mill 2, a hot sawing machine 3, a rail heat treatment device 4, and a cooling bed 5.
- a solid line arrow indicates the flow of the rail in the rail manufacturing line 1.
- the finish rolling machine 2 accepts the steel material to be subjected to finish rolling, and finish-rolls the accepted steel material. Thereby, the finish rolling mill 2 forms a rail having a cross-sectional shape in accordance with a request for a product order.
- the hot sawing machine 3 cuts off the crop at the front and rear ends of the rail that has been rolled into the product cross-sectional shape by the finish rolling mill 2, and cuts the rail to a length that meets the requirements of the product order.
- the rail heat treatment device 4 receives the rail having a length formed by the hot sawing machine 3.
- the rail is a high-temperature material after hot finish rolling by the finish rolling mill 2.
- the rail heat treatment apparatus 4 performs heat treatment for cooling the received high-temperature rail, and carries the cooled rail to the cooling floor 5 side.
- the rail heat treatment device 4 sequentially performs the heat treatment (cooling treatment) of the rail every time the high-temperature rail is received from the hot sawing machine 3 side in this way.
- the cooling floor 5 sequentially receives the rails cooled by the rail heat treatment device 4 and cools the rails from the rail heat treatment device 4 to a temperature close to room temperature.
- the rail heat treatment device 4 is for cooling the high-temperature rail 9 after hot finish rolling as described above, and it cools the rail 9 and the transport device 10 that transports the rail 9.
- the transport device 10 is a device for receiving the rail 9 before cooling and sending the rail 9 after cooling, and includes a plurality of transport rollers 11 and a plurality of carry-in / out sections 12.
- the plurality of transport rollers 11 are arranged in the vicinity of the entrance / exit of the rail 9 on the side of the cooling device 20 so that the respective transport roller shafts and the longitudinal direction of the rail 9 are perpendicular to each other along the longitudinal direction of the rail 9. .
- positioning length of the some conveyance roller 11 is more than the rail length of the one rail 9, as shown in FIG.
- the plurality of transport rollers 11 are rotationally driven by a predetermined driving device (not shown) to transport the rail 9 before cooling to the side of the cooling device 20 as indicated by the broken arrows in FIG.
- the rail 9 is sent to the outside.
- the required number (for example, three) of the carry-in / out units 12 is disposed in a region within the length of the rail 9 on the plurality of transport rollers 11 and at a position where it can enter the gap between the transport rollers 11.
- Each carry-in / out unit 12 reciprocates between the positions of the plurality of transport rollers 11 and the position in the cooling device 20 while being driven while matching the operation timing, the movement direction, and the movement amount (broken arrows in FIG. 2). reference).
- each carry-in / out unit 12 carries the rail 9 before cooling from the plurality of transport rollers 11 into the cooling device 20, and a plurality of the rails 9 after cooling from the same cooling device 20 side as the loading side of the rail 9.
- positioning of the carrying in / out part 12 should just be the quantity which can be transferred, supporting the rail 9, and is not specifically limited to three.
- the cooling device 20 is a device for cooling the hot rail 9 after hot finish rolling. Specifically, as shown in FIGS. 2 and 3, the cooling device 20 includes a support and restraint device 21 that supports and restrains the rail 9 and cooling headers 23 a to 23 c for cooling the rail 9. In addition, FIG. 3 shows a schematic configuration of the cooling device 20 viewed from the direction A in FIG.
- the support restraint device 21 is realized by using a support base extending in the longitudinal direction of the rail 9 and supports the rail 9 transported from the transport roller 11 side by the loading / unloading unit 12. In this case, the support restraint device 21 supports the rail 9 so that the sole portion of the rail 9 faces the cooling header 23a.
- the support and restraint device 21 has a plurality of restraining portions 22 at predetermined intervals in a region within the length of the rail 9. As shown in FIG. 2, the plurality of restraining portions 22 are arranged along a longitudinal direction of the rail 9 at a predetermined position (for example, a side position of the cooling header 23 a). Each of the plurality of restraining portions 22 clamps the foot portion of the rail 9 as shown in FIG. 3, and cooperates with each other to restrain the rail 9 so that it can be released.
- the cooling headers 23a to 23c are realized by using a cooling medium spray nozzle or the like, and cool the rail 9 by spraying the cooling medium onto the rail 9 to be cooled. Specifically, as shown in FIG. 3, the cooling header 23 a injects a cooling medium onto the foot sole portion of the rail 9, thereby cooling the rail 9 from the foot side. As shown in FIG. 2, a plurality of such cooling headers 23 a are discontinuously arranged at predetermined intervals along the longitudinal direction of the rail 9. That is, discontinuous portions 24 are formed between the cooling headers 23a.
- the discontinuous portion 24 is a gap necessary for the carry-in / out portion 12 described above to enter the cooling device 20, and is formed corresponding to the position of each carry-in / out portion 12.
- the cooling headers 23b and 23c inject the cooling medium onto the head side of the rail 9, thereby cooling the rail 9 from the head side.
- the cooling header 23 b injects a cooling medium onto the top of the rail 9
- the cooling header 23 c injects a cooling medium onto the head side of the rail 9.
- the cooling headers 23 b and 23 c have a shape that is continuously extended along the longitudinal direction of the rail 9.
- Such cooling headers 23b and 23c are supported by a predetermined driving device (not shown), and when the carry-in / out unit 12 enters the cooling device 20 and when the carry-in / out unit 12 leaves the cooling device 20, Move up and down. This avoids contact between the loading / unloading portion 12 or the rail 9 and the cooling headers 23b and 23c when the rail 9 is loaded / unloaded.
- the oscillation mechanism 30 is for reciprocally moving the rail 9 in the cooling device 20 and the cooling headers 23a to 23c along the longitudinal direction of the rail 9.
- the oscillation mechanism 30 includes a support frame 31 fixed to the cooling device 20 and a cylinder device 32 that reciprocates the support frame 31 in the longitudinal direction of the rail 9.
- the support frame 31 is a frame that supports the support and restraint device 21 in the cooling device 20, and is fixed to the cooling device 20 so as to surround a side portion of the support and restraint device 21, for example, as shown in FIG. 2.
- the cylinder device 32 has an oscillation shaft that can reciprocate, and is connected to the support frame 31 via the oscillation shaft. The cylinder device 32 reciprocates the oscillation shaft, thereby reciprocating the support restraint device 21 together with the support frame 31 in the longitudinal direction of the rail 9.
- the support and restraint device 21 is independent of the cooling headers 23a to 23c of the cooling device 20. That is, the support restraint device 21 can be displaced relative to the cooling headers 23a to 23c. Further, as described above, the support and restraint device 21 restrains the rail 9 by the restraining portion 22.
- the cylinder device 32 reciprocates the rail 9 on the support restraint device 21 along its longitudinal direction with respect to the cooling headers 23a to 23c by executing the reciprocation of the support restraint device 21. Let In this case, the cylinder device 32 causes the rail 9 on the support and restraint device 21 to reciprocate relative to the cooling header 23a that is discontinuous along the longitudinal direction of the rail 9, in particular.
- the control system 40 is for performing oscillation control on the oscillation mechanism 30. As shown in FIG. 2, the control system 40 includes an input unit 41 for inputting various information, a display unit 42 for displaying various information, and an oscillation. A storage unit 43 that stores information necessary for control and the like, and a control unit 44 that performs oscillation control on the oscillation mechanism 30 are provided.
- the input unit 41 is realized by using an input device such as a keyboard and a mouse, and inputs various information to the control unit 44 in response to an input operation by the operator.
- the equipment specifications of the rail heat treatment device 4 such as the hardness information of the rail 9 after cooling, the length of the discontinuous portion 24 described above (that is, the header interval between the cooling headers 23a), and the like.
- Information material information such as the components and steel types of the steel material constituting the rail 9 can be mentioned.
- the allowable range of the hardness of the rail 9 can also be input by the input unit 2.
- the display unit 42 displays various information instructed to be displayed by the control unit 44. Specifically, the display unit 42 displays various information useful for oscillation control, such as information input by the input unit 41 and calculation processing results related to oscillation control.
- the storage unit 43 stores the information instructed to be stored by the control unit 44, and transmits the storage information instructed to be read to the control unit 44. Specifically, the storage unit 43 stores input information from the input unit 41, operation information of the rail manufacturing line 1 illustrated in FIG. In addition, the storage unit 43 includes, as the oscillation information 43a, a correlation equation indicating a correlation between the cooling time of the rail 9 by the cooling header 23a and the hardness of the rail 9 after cooling, an arithmetic equation for calculating the cooling time of the rail 9, The header interval between the headers 23a is stored.
- a correlation table or the like may be used instead of the above-described correlation equation.
- a conversion table or the like may be used instead of the above-described arithmetic expression.
- the storage unit 43 has a tolerance range of the hardness of the rail 9 input by the input unit 41, and a correlation formula indicating a correlation between the tolerance range of the hardness, the cooling time of the rail 9, and the hardness of the rail 9 after cooling.
- the allowable range of the cooling time of the rail 9 necessary for satisfying the allowable range of the hardness of the rail 9 (hereinafter referred to as “required cooling time”) can also be stored.
- the control unit 44 is realized by using a memory for storing a program for realizing the function of the rail heat treatment apparatus 4 and a CPU for executing the program in the memory.
- the control unit 44 controls each component of the control system 40, that is, each operation of the input unit 41, the display unit 42, and the storage unit 43, and controls input / output of electric signals to / from these components. To do.
- control unit 44 relatively reciprocates between the cooling header 23a and the rail 9 along the longitudinal direction of the rail 9 during the period when the rail 9 in the cooling device 20 is cooled by the cooling medium from the cooling headers 23a to 23c.
- the oscillation mechanism 30 is controlled to operate. Specifically, the control unit 44 acquires cooling operation information indicating the state of the cooling operation of the cooling device 20 from the cooling device 20. Based on the acquired cooling operation information, the control unit 44 grasps the timing at which the rail 9 in the cooling device 20 is cooled by the cooling medium from the cooling headers 23a to 23c. The control unit 44 performs oscillation control on the oscillation mechanism 30 at the grasped cooling timing of the rail 9.
- the control unit 44 first generates a correlation equation indicating the correlation between the cooling time of the rail 9 by the cooling header 23 a and the hardness of the rail 9 after cooling from the oscillation information 43 a in the storage unit 43. get. Next, the control unit 44 obtains an allowable range of the cooling time (necessary cooling time) of the rail 9 necessary for satisfying the allowable range of the hardness of the rail 9 based on the acquired correlation equation. Thereafter, the control unit 44 determines that the cooling time in all locations of the rail 9 is the required cooling time regardless of the longitudinal positional relationship between the rail 9 and the cooling header 23a based on the allowable range of the required cooling time.
- the appropriate values of the stroke (hereinafter referred to as the oscillation stroke) and the speed (hereinafter referred to as the oscillation speed) of the relative reciprocation between the rail 9 and the cooling header 23a are calculated so as to be within the permissible range.
- the control unit 44 performs the oscillation control by causing the oscillation mechanism 30 to perform the reciprocating operation of the oscillation stroke and the oscillation speed calculated as described above.
- the correlation equation used for the oscillation control described above is that the hardness HV (h) of the rail 9 after cooling by the cooling medium from the cooling headers 23a to 23c and the rail 9 after natural cooling not using this cooling medium.
- HV (n) K ⁇ t + HV (n) (1)
- the cooling time t decreases as the facing time of the rail 9 facing the discontinuous portion 24 between the cooling headers 23a or the facing region increases. This is because the contact time between the cooling medium from the cooling header 23a and the rail 9 decreases due to the increase in the facing time or the facing region of the rail 9.
- the cooling time t of the rail 9 affected by the discontinuous portion 24 varies depending on the oscillation stroke and the oscillation speed of the reciprocating motion that the oscillation mechanism 30 causes the rail 9 on the support and restraint device 21 to perform. To do.
- FIG. 4 is a diagram for explaining the cooling time of the rail affected by the discontinuity between the cooling headers.
- one of the discontinuous portions 24 between the cooling headers 23a shown in FIG. 2 will be exemplified, and the cooling time t of the rail 9 affected by the discontinuous portions 24 will be described in detail.
- the region where the rail 9 and the cooling header 23a face each other is a region where the cooling medium injected from the cooling header 23a and the rail 9 are in contact with each other, and is defined as the cooling regions R1 and R3 of the rail 9.
- the region where the rail 9 and the discontinuous portion 24 face each other is a region where the cooling medium from the cooling header 23a and the rail 9 do not face each other, and thus is defined as the uncooled region R2 of the rail 9.
- region R2 is not cooled enough like the part of the rail 9 located in cooling area
- coordinate axes parallel to the longitudinal direction of the rail 9 are set for all the cooling regions R1 and R3 and the non-cooling region R2 defined in FIG.
- This coordinate axis determines the coordinates of the position x of the oscillation end of the support and restraint device 21 by the oscillation mechanism 30 described above, that is, the oscillation end of the rail 9 on the support and restraint device 21.
- the right direction from the left cooling header 23a shown in FIG. 4 to the right cooling header 23a through the discontinuous portion 24 is the positive direction, and the opposite direction is the negative direction.
- the position displaced from the end of the cooling header 23a on the discontinuous portion 24 side by the oscillation stroke b of the rail 9 in the negative direction of the coordinate axis is the origin of this coordinate axis.
- the rail 9 oscillates along the longitudinal direction of the rail 9 while partially facing the discontinuous portion 24 whose length is the header interval a between the cooling headers 23 a.
- b and reciprocation of oscillation speed v are performed.
- the header interval “a” is a facility specification of the cooling device 20 and is constant unless the specification is changed.
- the oscillation stroke b and the oscillation speed v are control factors for the oscillation control by the control unit 44 shown in FIG.
- the oscillation stroke b is set larger than the header interval a (b> a).
- the cooling time t of the rail portion having the position x as the oscillation end is as follows.
- the rail portion in this case performs a reciprocating motion along the longitudinal direction of the rail 9 in the cooling region R1 without entering the uncooled region R2, as shown in FIG.
- Such a cooling time t of the rail portion is calculated based on the following formula (2) using the oscillation stroke b and the oscillation speed v of the rail 9.
- t 2b / v (x ⁇ 0) (2)
- the cooling time t of the rail portion with the position x as the oscillation end is as follows.
- the rail portion in this case performs a reciprocating motion along the longitudinal direction of the rail 9 over both the cooling region R1 and the non-cooling region R2, as shown in FIG.
- both the period during which this rail portion enters the uncooled region R2 and the rail length increase as compared to the case of x ⁇ 0 described above.
- Such a cooling time t of the rail portion depends on the oscillation stroke b and the oscillation speed v of the rail 9 and the position x of the oscillation end, and is calculated based on the following equation (3).
- t 2b / v-2x / v (0 ⁇ x ⁇ a) (3)
- the cooling time t of the rail portion with the position x as the oscillation end is as follows: Become.
- the rail portion in this case performs a reciprocating motion along the longitudinal direction of the rail 9 over the cooling regions R1, R3 and the non-cooling region R2, as shown in FIG.
- both the period during which the rail portion is present in the uncooled region R2 and the rail length increase as compared with the case of 0 ⁇ x ⁇ a described above.
- Such a cooling time t of the rail portion depends on the oscillation stroke b and the oscillation speed v of the rail 9 and the header interval a, and is calculated based on the following equation (4).
- t 2b / v-2a / v (a ⁇ x ⁇ b) (4)
- the rail having the position x as the oscillation end when the position x exceeds the oscillation stroke b and is equal to or less than the sum (a + b) of the header interval a and the oscillation stroke b (b ⁇ x ⁇ a + b), the rail having the position x as the oscillation end.
- the cooling time t of the part is as follows. That is, the rail portion in this case performs a reciprocating motion along the longitudinal direction of the rail 9 over both the non-cooling region R2 and the cooling region R3, as shown in FIG. During this reciprocating operation, both the period during which the rail portion is present in the uncooled region R2 and the rail length are reduced as compared with the case of a ⁇ x ⁇ b described above.
- the cooling time t of the rail portion having the position x as the oscillation end is as follows. That is, the rail portion in this case performs a reciprocating operation along the longitudinal direction of the rail 9 in the cooling region R3 without entering the uncooled region R2, as shown in FIG.
- the rail portion cooling time t is calculated based on the following equation (6) using the oscillation stroke b and the oscillation speed v of the rail 9 as in the case of x ⁇ 0 described above.
- t 2b / v (a + b ⁇ x) (6)
- FIG. 5 is a schematic diagram showing a correlation between the position of the oscillation end and the cooling time of the rail portion.
- the cooling time t is maintained at this minimum cooling time.
- the cooling time t is maintained at this maximum cooling time.
- the cooling time t that increases or decreases in accordance with the change of the position x satisfies the following expression (7) with respect to the maximum cooling time Ts and the minimum cooling time Tm of the rail 9 by the cooling header 23a.
- Ts: 2b / v Tm: (2b / v-2a / v) (7)
- the rail 9 cut out by the hot sawing machine 3 is conveyed to the rail heat treatment device 4.
- the rail heat treatment device 4 carries the rail 9 from the hot sawing machine 3 to the vicinity of the side of the cooling device 20 by the plurality of conveyance rollers 11 of the conveyance device 10 shown in FIG.
- the rails 9 on the plurality of transport rollers 11 are supported by the respective carry-in / out sections 12 and are taken out from the plurality of transport rollers 11.
- Each carry-in / out section 12 transports the rail 9 thus taken out toward the cooling device 20, and carries the rail 9 onto the support and restraint device 21 from the side (entry side) of the cooling device 20.
- the rail 9 thus carried into the cooling device 20 is supported by the support and restraint device 21 and restrained by the restraint portion 22. Thereafter, the cooling headers 23 a to 23 c inject a cooling medium onto the rail 9 on the support and restraint device 21.
- this cooling medium should just be a cooling medium which can cool the rails 9, such as air, spray water, a brackish water mixture, steam, or water.
- the control unit 44 of the control system 40 acquires the cooling operation information from the cooling device 20, and grasps the cooling timing of the rail 9 based on the acquired cooling operation information.
- the control unit 44 controls the oscillation mechanism 30 at the cooling timing of the rail 9, thereby causing the cooling headers 23 a to 23 c and the rail 9 to reciprocate relatively along the longitudinal direction of the rail 9.
- control unit 44 obtains the necessary cooling time for satisfying the allowable range of the hardness of the rail 9 required as a product based on the correlation equation shown in the above-described equation (1). In this case, the control unit 44 calculates the cooling time range of the rail 9 that satisfies the allowable range of the hardness of the rail 9 based on this correlation equation. Then, the control part 44 determines the required cooling time of the rail 9 from this cooling time range.
- the control unit 44 controls the oscillation stroke b and the oscillation speed v of the relative reciprocation between the rail 9 and the cooling header 23a based on the necessary cooling time obtained as described above.
- the control unit 44 takes into account the length of the discontinuous portions 24 between the plurality of cooling headers 23a, that is, the header interval a (see FIG. 4), to the discontinuous portions 24 between the plurality of cooling headers 23a.
- the minimum value of the cooling time t of the rail 9 that decreases due to this is calculated.
- the control unit 44 calculates the minimum cooling time Tm of the rail 9 based on the above formulas (2) to (7).
- the control unit 44 controls the oscillation stroke b and the oscillation speed v so that the minimum cooling time Tm falls within the allowable range of the required cooling time of the rail 9.
- the control unit 44 fixes the oscillation speed v to an appropriate value suitable for the operation status of the rail manufacturing line 1 (see FIG. 1), and uses the oscillation stroke b as a parameter.
- the control unit 44 calculates the oscillation stroke b so that the above-described minimum cooling time Tm falls within the allowable range of the required cooling time.
- the control unit 44 controls the cylinder device 32 of the oscillation mechanism 30 so as to execute the reciprocating operation of the oscillation stroke b and the oscillation speed v thus obtained.
- the cylinder device 32 reciprocates the oscillation shaft based on the control of the control unit 44 described above, and thereby reciprocates the support restraint device 21 together with the support frame 31 in the longitudinal direction of the rail 9.
- the rail 9 on the support restraint device 21 reciprocates at the oscillation stroke b and the oscillation speed v relative to the cooling headers 23a to 23c along the longitudinal direction thereof.
- Such a rail 9 performs a reciprocating motion of the oscillation stroke b and the oscillation speed v determined in consideration of the discontinuous portion 24 as described above, and the cooling medium is injected from the cooling headers 23a to 23c. . Due to the synergistic effect of the reciprocating operation and the injection of the cooling medium, the rail 9 sufficiently comes into contact with the cooling medium from the cooling headers 23a to 23c (particularly, the cooling medium from the cooling header 23a forming the discontinuous portion 24). . As a result, the rail 9 is uniformly cooled so as to have a hardness within an allowable range required for a product.
- control unit 44 grasps the timing of completion of injection of the cooling medium with respect to the rail 9 based on the cooling operation information from the cooling device 20.
- the control unit 44 controls the cylinder device 32 at the grasped timing to stop the reciprocating operation of the rail 9 by the oscillation mechanism 30.
- each carry-in / out unit 12 enters the discontinuous portion 24 between the cooling headers 23a, and removes and supports the rail 9 after cooling from the support and restraint device 21.
- each carrying-in / out part 12 carries out the rail 9 after this cooling from the entrance side of the cooling device 20 mentioned above, ie, the same cooling device 20 side as the carrying-in side of the rail 9 before cooling.
- each carry-in / out unit 12 transfers the cooled rail 9 from the cooling device 20 toward the plurality of transport rollers 11, and then places the cooled rail 9 on the plurality of transport rollers 11. .
- the plurality of transport rollers 11 carry the cooled rail 9 from the rail heat treatment device 4 toward the cooling bed 5 (see FIG. 1).
- FIG. 6 is a schematic diagram showing a specific example of the correlation between the rail cooling time and the hardness of the rail after cooling.
- 7A and 7B are schematic diagrams showing a specific example of the correlation between the cooling time and hardness of the rail depending on the header interval.
- 8A and 8B are schematic diagrams showing another specific example of the correlation between the cooling time and the hardness of the rail depending on the header interval.
- the HH370 rail described in JIS E 1120 (2007) was used as the rail 9 to be cooled.
- the hardness HV (h) of the rail 9 is the Vickers hardness at the position of the top surface 11 [mm] on the top center line of the rail 9.
- the correlation line L ⁇ b> 2 indicates a specific example of the correlation between the cooling time t of the rail 9 based on the above-described formula (1) and the hardness HV (h) of the rail 9 after cooling. Yes.
- “0.419” is the constant K in the equation (1)
- “303.7” is the hardness HV (n) in the equation (1).
- the relative reciprocation between the rail 9 and the cooling header 23a can be controlled. Specifically, first, an allowable range ⁇ HV of the hardness HV (h) of the rail 9 shown in FIG. 6 is set according to the product requirement. Next, based on the correlation between the hardness HV (h) indicated by the correlation line L2 and the cooling time t, an allowable range ⁇ T of the necessary cooling time of the rail 9 that satisfies the allowable range ⁇ HV is calculated. Subsequently, the oscillation stroke b and the oscillation speed v are controlled such that the minimum cooling time Tm of the rail 9 is included in the allowable range ⁇ T of the necessary cooling time.
- the oscillation mechanism 30 is caused to perform the reciprocating motion of the oscillation stroke b and the oscillation speed v determined as described above.
- the rail 9 is uniformly cooled, and as a result, the hardness HV (h) of the rail 9 after cooling is equalized to a hardness within the allowable range ⁇ HV shown in FIG. 6, that is, a hardness within the required range.
- the cooling time t of the rail portion that is not affected by the discontinuous portion 24 between the cooling headers 23a that is, the maximum cooling time Ts of the rail 9 is 120 [sec] from the viewpoint of the quality of the rail head.
- the hardness HV (h) of the rail 9 is 354, which is the maximum hardness.
- the allowable range ⁇ HV of the hardness HV (h) of the rail 9 is 350 to 354.
- the rail thus, the hardness HV (h) of 9 can be controlled within the allowable range ⁇ HV of 350 to 354.
- the correlation between the cooling time t of the rail 9 and the hardness HV (h) was tested when the header interval a between the cooling headers 23a was 300 [mm].
- the oscillation speed v was set to 55 [mm / sec].
- the correlation between the stroke end position x of the rail 9 and the cooling time t is as shown by a correlation line L1 in FIG. That is, when the coordinate value of the position x is less than or equal to zero and exceeds the sum (a + b), the cooling time t is maximized. In addition, when the coordinate value of the position x exceeds the header interval a and is equal to or less than the oscillation stroke b, the cooling time t is minimized.
- L3 the position changed corresponding to the position x.
- the cooling time t is maintained at 120 [sec].
- the cooling time t decreased linearly from 120 [sec] to 40 [sec].
- the cooling time t is maintained at 40 [sec].
- the cooling time t increases linearly from 40 [sec] to 120 [sec].
- the cooling time t was maintained at 120 [mm].
- the cooling time t is 60 [sec].
- the hardness HV (h) of the rail 9 after cooling was tested in correspondence with the cooling time t of the rail 9 correlated with the position x.
- hardness HV (h) as shown on the right vertical axis of FIG. 7A was obtained, and a correlation between cooling time t and hardness HV (h) as shown in FIG. 6 was obtained.
- the maximum cooling time Ts is 120 [sec]
- the header interval a is 300 [mm]
- the oscillation speed v is 55 [mm / sec]
- the oscillation stroke b is 450.
- the minimum cooling time Tm is 40 [sec] which is outside the required cooling time allowable range ⁇ T of 111 to 120 [sec]
- the actually obtained hardness HV (h) is also
- the hardness HV (h) of the rail 9 deviated from 350 to 354, which is an allowable range ⁇ HV.
- the influence of the oscillation stroke b on the minimum cooling time Tm was examined so that the minimum cooling time Tm was within a range of 111 to 120 [sec], which is an allowable range ⁇ T of the required cooling time.
- the oscillation stroke b is 3900 [mm]
- the minimum cooling time Tm is 111 [sec] which is the lower limit value of the allowable cooling time allowable range ⁇ T. Therefore, the correlation between the cooling time t of the rail 9 and the hardness HV (h) was tested by setting the oscillation stroke b to 3900 [mm].
- the cooling time t of the rail 9 changed corresponding to the position x as indicated by the correlation line L4 in FIG. 7B.
- the hardness HV (h) of the rail 9 after cooling was tested corresponding to the cooling time t of the rail 9 correlated with the position x as described above.
- a hardness HV (h) as shown on the right vertical axis of FIG. 7B was obtained, and a correlation between the cooling time t and the hardness HV (h) as shown in FIG. 6 was obtained.
- the maximum cooling time Ts is 120 [sec]
- the header interval a is 300 [mm]
- the oscillation speed v is 55 [mm / sec]
- the oscillation stroke b is 3900 [mm].
- the minimum cooling time Tm is 111 [sec], which is within the range of 111 to 120 [sec], which is an allowable range ⁇ T of the necessary cooling time
- actually the obtained hardness HV (h) is also
- the hardness HV (h) of the rail 9 was 350 to 354, which was within the allowable range ⁇ HV.
- the header interval a between the cooling headers 23a takes another value
- the correlation with was tested.
- the oscillation speed v was set to 55 [mm / sec].
- the hardness HV (h) of the rail 9 after cooling was tested in correspondence with the cooling time t of the rail 9 correlated with the position x.
- a hardness HV (h) as shown on the right vertical axis of FIG. 8A was obtained, and a correlation between the cooling time t and the hardness HV (h) as shown in FIG. 6 was obtained.
- the maximum cooling time Ts is 120 [sec]
- the header interval a is 100 [mm]
- the oscillation speed v is 55 [mm / sec]
- the oscillation stroke b is 450.
- the minimum cooling time Tm is 93 [sec] which is outside the allowable cooling time tolerance ⁇ T of 111 to 120 [sec]
- the actually obtained hardness HV (h) is also shown in FIG. As shown in 8A, the hardness was 342 to 354, and the hardness HV (h) of the rail 9 was outside the allowable range ⁇ HV of 350 to 354.
- the influence of the oscillation stroke b on the minimum cooling time Tm was examined so that the minimum cooling time Tm was within a range of 111 to 120 [sec], which is an allowable range ⁇ T of the required cooling time.
- the oscillation stroke b is 1300 [mm]
- the minimum cooling time Tm is 111 [sec] which is the lower limit value of the allowable cooling time allowable range ⁇ T. Therefore, the correlation between the cooling time t of the rail 9 and the hardness HV (h) was tested by setting the oscillation stroke b to 1300 [mm].
- the cooling time t of the rail 9 changed corresponding to the position x as shown by the correlation line L6 in FIG. 8B.
- the hardness HV (h) of the rail 9 after cooling was tested corresponding to the cooling time t of the rail 9 correlated with the position x as described above.
- a hardness HV (h) as shown on the right vertical axis of FIG. 8B was obtained, and a correlation between the cooling time t and the hardness HV (h) as shown in FIG. 6 was obtained.
- the maximum cooling time Ts is 120 [sec]
- the header interval a is 100 [mm]
- the oscillation speed v is 55 [mm / sec]
- the oscillation stroke b is 1300 [mm].
- the minimum cooling time Tm is 111 [sec], which is within the range of 111 to 120 [sec], which is an allowable range ⁇ T of the necessary cooling time
- actually the obtained hardness HV (h) is also
- the hardness HV (h) of the rail 9 was 350 to 354, which was within the allowable range ⁇ HV.
- the HH370 rail described in JIS E 1120 (2007) was used as the rail 9 to be cooled.
- the present invention may be used when a rail of another steel type is used. The same effects as those of the above-described embodiment are achieved. That is, in the present invention, the steel type of the rail 9 to be cooled is not particularly limited.
- the correlation equation showing the correlation between the cooling time of the rail by the cooling medium from the cooling header arranged along the longitudinal direction of the rail and the hardness of the rail after cooling.
- the required cooling time (required cooling time of the rail) is obtained to satisfy the tolerance range of the hardness of the rail.
- the oscillation stroke and the oscillation speed are controlled based on the required cooling time, and the controlled oscillation stroke and oscillation are controlled as a relative reciprocation between the rail and the cooling header along the longitudinal direction of the rail.
- the reciprocating operation of the acceleration speed is executed.
- the discontinuous portion of the discontinuous portion corresponds to the distance of the discontinuous portion between the cooling headers. It is possible to set appropriate values for the oscillation stroke and the oscillation speed suitable for the distance. Furthermore, as a relative reciprocating motion between the rail and the cooling header, a reciprocating motion with an appropriate oscillation stroke and oscillation speed taking into account the distance of the discontinuous portion can be executed. That is, it is possible to execute proper oscillation control that takes into account the cooling header interval, and thereby, even when the rail is cooled by using a cooling header that is discontinuous in the longitudinal direction of the rail, the rail extends in the longitudinal direction of the rail.
- the cooling time difference can be reduced. As a result, since the uneven cooling of the rail in the longitudinal direction of the rail can be eliminated, the uneven hardness of the rail in the longitudinal direction of the rail can be suppressed, and uniform rail quality can be ensured in the longitudinal direction of the rail.
- the rail entry side of the cooling device 20 when the rail 9 before cooling is carried into the cooling device 20 and the rail 9 after cooling from the cooling device 20.
- the rail entry side and the rail exit side in the cooling device 20 may be different from each other.
- a carry-out conveyance device 50 having a configuration substantially similar to that of the conveyance device 10 may be installed on the opposite side of the conveyance device 10 with the cooling device 20 interposed therebetween. That is, the conveyance device 10 as the first conveyance device carries the rail 9 before cooling into the cooling device 20, and the conveyance device 50 as the second conveyance device carries out the rail 9 after cooling from the cooling device 20. May be.
- the conveyance device 50 uses a carry-out portion 52 that reciprocates between the discontinuous portion 24 (see FIG. 2) of the cooling header 23a and the conveyance roller 51, and uses the opposite side (hereinafter referred to as the output) of the cooling device 20 to the rail carry-in side.
- the rail 9 after cooling may be carried out from the side).
- the transport device 10 is a device that carries the rail 9 into the cooling device 20, and the carry-in / out section 12 described above does not carry the rail 9 out of the cooling device 20. May be.
- the transport device 50 may unload the rail 9 after cooling from the exit side of the cooling device 20 using each of the unloading portions 52 and the plurality of transport rollers 51.
- the position of the cooling header is fixed, and the rail is reciprocated along the rail longitudinal direction relative to the cooling header.
- the position of the rail in the cooling device may be fixed, and the cooling header may be reciprocated along the rail longitudinal direction relative to the rail. That is, the rail to be cooled and the cooling header may be reciprocated relatively along the rail longitudinal direction.
- the hardness of the position of the top surface 11 [mm] on the top center line of the rail 9 after cooling was measured, but not limited to this, for example, in addition to the hardness of the gauge corner portion, You may measure the hardness of any part of the head side hardness, trunk
- cooling headers 23b and 23c which cool the head side of the rail 9 were continuously arrange
- the cooling headers 23b and 23c May be discontinuously arranged along the longitudinal direction of the rail 9 in the same manner as the cooling header 23a described above.
- the present invention is not limited by the embodiment described above. What was comprised combining each component mentioned above suitably is also contained in this invention. In addition, all other embodiments, examples, operation techniques, and the like made by those skilled in the art based on the above-described embodiments are included in the present invention.
- the rail heat treatment apparatus and the rail heat treatment method according to the present invention are useful for heat treatment for cooling the rail, and in particular, using the cooling headers disposed discontinuously along the rail longitudinal direction, It is suitable for a rail heat treatment apparatus and a rail heat treatment method for cooling uniformly in the longitudinal direction.
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Abstract
Description
図1は、本発明の実施の形態にかかる軌条熱処理装置を備えた軌条製造ラインの概略構成を示すブロック図である。図2は、本発明の実施の形態にかかる軌条熱処理装置の一構成例を示す模式図である。図3は、本実施の形態にかかる軌条熱処理装置の冷却ヘッダーの一構成例を示す模式図である。以下では、まず、図1を参照して、本実施の形態における軌条製造ラインの構成を説明し、つぎに、図2,3を参照して、本実施の形態にかかる軌条熱処理装置の構成を説明する。
HV(h)=K×t+HV(n) ・・・(1)
t=2b/v (x≦0) ・・・(2)
t=2b/v-2x/v (0<x≦a) ・・・(3)
t=2b/v-2a/v (a<x≦b) ・・・(4)
t=(2b/v-2a/v)+(2x-2b)/v
=2x/v-2a/v (b<x≦a+b) ・・・(5)
t=2b/v (a+b<x) ・・・(6)
Ts:2b/v=Tm:(2b/v-2a/v) ・・・(7)
Tm=Ts÷(2b/v)×(2b/v-2a/v)
=120÷16.36×5.45=40[sec]
Tm=Ts÷(2b/v)×(2b/v-2a/v)
=120÷16.36×12.73=93[sec]
すなわち、最小冷却時間Tmは93[sec]になる。この場合、軌条9の冷却時間tは、図8Aの相関線L5に示すように、位置xに対応して変化した。
2 仕上圧延機
3 熱間鋸断機
4 軌条熱処理装置
5 冷却床
9 軌条
10,50 搬送装置
11,51 搬送ローラ
12 搬入出部
20 冷却装置
21 支持拘束装置
22 拘束部
23a~23c 冷却ヘッダー
24 不連続部分
30 オシレーション機構
31 支持枠
32 シリンダー装置
40 制御系
41 入力部
42 表示部
43 記憶部
43a オシレーション情報
44 制御部
52 搬出部
L1~L6 相関線
R1,R3 冷却領域
R2 無冷却領域
Claims (10)
- 冷却対象の軌条に冷却媒体を噴射する冷却ヘッダーと、
前記軌条の長手方向に沿って、前記軌条と前記冷却ヘッダーとを相対的に往復動作させるオシレーション機構と、
前記オシレーション機構に対するオシレーション制御を行う制御系と、
を備え、
前記制御系は、
前記オシレーション制御に必要な情報等を記憶する記憶部と、
前記冷却ヘッダーによる前記軌条の冷却時間と冷却後の前記軌条の硬度との相関を示す相関式に基づいて、前記軌条の硬度の許容範囲を満足する前記軌条の必要冷却時間の許容範囲を求め、前記必要冷却時間の許容範囲をもとに、前記軌条と前記冷却ヘッダーとの相対的な往復動作のストロークおよび速度を制御して、前記ストロークおよび速度の往復動作を前記オシレーション機構に実行させる制御部と、
を備えたことを特徴とする軌条熱処理装置。 - 前記冷却ヘッダーは、前記軌条の長手方向に沿って、所定の間隔を空けて不連続に複数配置され、
前記制御系は、複数の前記冷却ヘッダー間の不連続部分に起因して減少する前記軌条の冷却時間の最小値を算出し、前記冷却時間の最小値が前記必要冷却時間の許容範囲内に入るように、前記軌条と前記冷却ヘッダーとの相対的な往復動作のストロークおよび速度を制御することを特徴とする請求項1に記載の軌条熱処理装置。 - 前記制御系は、前記相関式に基づいて、前記軌条の硬度の許容範囲を満足する前記軌条の冷却時間範囲を算出し、前記冷却時間範囲の中から前記必要冷却時間を決定することを特徴とする請求項1または2に記載の軌条熱処理装置。
- 前記軌条の長手方向に沿って配置された複数の前記冷却ヘッダーを有する冷却装置と、
冷却前の前記軌条を前記冷却装置に搬入し、前記冷却装置に対して前記軌条の搬入側と同じ側から、冷却後の前記軌条を搬出する搬送装置と、
を備えたことを特徴とする請求項1または2に記載の軌条熱処理装置。 - 前記軌条の長手方向に沿って配置された複数の前記冷却ヘッダーを有する冷却装置と、
冷却前の前記軌条を前記冷却装置に搬入する第1の搬送装置と、
前記第1の搬送装置による前記軌条の搬入側の反対側から、前記冷却装置による冷却後の前記軌条を搬出する第2の搬送装置と、
を備えたことを特徴とする請求項1または2に記載の軌条熱処理装置。 - 冷却ヘッダーから冷却対象の軌条に冷却媒体を噴射して前記軌条を冷却する冷却時間と冷却後の前記軌条の硬度との相関を示す相関式に基づいて、前記軌条の硬度の許容範囲を満足する前記軌条の必要冷却時間の許容範囲を求め、前記必要冷却時間の許容範囲をもとに往復動作のストロークおよび速度を制御し、前記軌条の長手方向に沿った前記軌条と前記冷却ヘッダーとの相対的な往復動作として、前記ストロークおよび前記速度の往復動作を実行することを特徴とする軌条熱処理方法。
- 前記軌条の長手方向に沿って所定の間隔を空けて不連続に配置された複数の前記冷却ヘッダー間の不連続部分の長さを加味して、前記不連続部分に起因して減少する前記軌条の冷却時間の最小値を算出し、前記冷却時間の最小値が前記必要冷却時間の許容範囲内に入るように、前記軌条と前記冷却ヘッダーとの相対的な往復動作のストロークおよび速度を制御することを特徴とする請求項6に記載の軌条熱処理方法。
- 前記相関式に基づいて、前記軌条の硬度の許容範囲を満足する前記軌条の冷却時間範囲を算出し、前記冷却時間範囲の中から前記必要冷却時間を決定することを特徴とする請求項6または7に記載の軌条熱処理方法。
- 前記軌条の長手方向に沿って配置された複数の前記冷却ヘッダーを有する冷却装置に対して、冷却前の前記軌条を搬入し、前記冷却装置に対して前記軌条の搬入側と同じ側から、冷却後の前記軌条を搬出することを特徴とする請求項6または7に記載の軌条熱処理方法。
- 前記軌条の長手方向に沿って配置された複数の前記冷却ヘッダーを有する冷却装置に対して、冷却前の前記軌条を前記冷却装置に搬入し、前記冷却装置における前記軌条の搬入側の反対側から、前記冷却装置による冷却後の前記軌条を搬出することを特徴とする請求項6または7に記載の軌条熱処理方法。
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US14/375,232 US9593393B2 (en) | 2012-02-06 | 2012-02-06 | Rail heat treatment device and rail heat treatment method |
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JPH01104721A (ja) * | 1987-10-19 | 1989-04-21 | Nippon Steel Corp | 高温レールの冷却法 |
JPH01246323A (ja) * | 1988-03-28 | 1989-10-02 | Nippon Steel Corp | レールの熱処理装置におけるレールの拘束装置 |
JPH0533057A (ja) * | 1991-07-29 | 1993-02-09 | Nkk Corp | 軌条熱処理装置 |
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US9593393B2 (en) | 2017-03-14 |
BR112014019017A2 (ja) | 2017-06-20 |
US20150021836A1 (en) | 2015-01-22 |
BR112014019017A8 (pt) | 2017-07-11 |
BR112014019017B1 (pt) | 2019-02-12 |
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