KR20060114544A - Head heat treatment equipment and method of the processed asymmetrical rail and a forged rail - Google Patents

Abstract

An equipment and a method for heat treatment of heads of processed asymmetrical rail and forged rail are provided to easily control an equipment shaft and easily coping with a slope between modules by using an universal joint, improve heat treatment quality of rails through free control of a heat treatment module, perform slag quenching using compressed air and control cooling capability through a flow control valve and a control part. An equipment(H) for heat treatment of heads of processed asymmetrical rail and forged rail comprises: a preheating part(100) for uniformly heating rails transferred through a transfer car(110) by medium frequency induction heating; a main heating part(200) comprising a coil for reheating heads of the rails preheated in the preheating part to a predetermined temperature range of a stabilized Ac3 transformation temperature or more and heating two front faces of the rails and side faces of the heads; a rail slag quenching part for cooling the heads of the rails so that the heads of the rails are transformed into a fine pearlite structure after transferring the rails into the atmosphere for a predetermined time so that the heads of the heated rails are conducted to a certain temperature; and an air mist cooling part(400) comprising spray nozzles for spraying high pressure air mist onto the heads of the rails in multiple steps, and a control part for controlling a module according to volume variation of the heads of the rails.

Description

Head heat treatment equipment and method of the processed asymmetrical rail and a forged rail}

1 is a front view showing the head heat treatment apparatus of the machined asymmetric rail and forged rail according to the present invention,

2 is an enlarged cross-sectional view of portion A of FIG. 1;

3 is an enlarged cross-sectional view of portion B of FIG. 1;

4 is an enlarged cross-sectional view of portion C of FIG. 1;

Figure 5 is a side view showing the head heat treatment apparatus of the machined asymmetric rail and forged rail according to the present invention,

6 is a front view showing a preheating unit of the head heat treatment apparatus of the machined asymmetric rail and forged rail according to the present invention,

Figure 7 is a side view showing the preheating of the head heat treatment apparatus of the machined asymmetric rail and forged rail according to the present invention,

8 is a front view showing the main heating portion of the head heat treatment apparatus of the machined asymmetric rail and forged rail according to the present invention,

Figure 9 is a side view showing the main heating portion of the head heat treatment apparatus of the machined asymmetric rail and forged rail according to the present invention.

Explanation of symbols on the main parts of the drawing

100: preheating unit 110: transfer cart

120: rail 122: tofu

124: bottom 126: processed rail

130: coil 132: rotation speed adjustment tab

133: silicon steel 200: the main heating part

300: slack quenching unit 400: air mist cooling unit

410: spray nozzle 500: universal joint

510: installation shaft 520: between universal joint connection

530: variable shaft 540: vertical control motor

550: left and right control motor H: heat treatment device

The present invention relates to an apparatus and method for head heat treatment of machined asymmetric rails and forged rails. In particular, it is easy to cope with the slope of modules according to rail expansion and control of facility axis by rail thermal deformation using universal joints. According to the free control of the heat treatment module, the heat treatment quality of the rail is improved by maintaining a constant distance from the front of the head of the rail, and uniform temperature control is possible by the medium frequency induction heating method. Slack quenching using compressed air and processed rail The present invention relates to a head heat treatment apparatus and method for machined asymmetric rails and forged rails whose cooling capacity can be controlled through flow control according to head volume changes.

In general, as the weight and speed of railway vehicles increase, the wear rate of the running surface of the rail head, which is the running surface of the rail that is in direct contact with the wheels of the railway rail, is gradually increased, so that local deformation and damage and fatal fracture are caused by the repeated load of the vehicle. In this case, the lifespan and stability of the rails are reduced, thereby increasing the cost of repairing and replacing the rails.

Accordingly, the wear resistance is improved by improving mechanical properties such as strength and hardness at an appropriate level on the head, which is the running surface of the railway rail, and heat-treating the head of the rail to improve the quality of the rail, and for heat treatment of the rail. The rail material is reheated to a high temperature zone and quenched and cooled by an appropriate cooling method. At this time, the rail is reheated by heating above the Ac3 transformation point, which is a temperature for changing the internal structure, and then controlling the cooling rate using an appropriate cooling medium. Cooling results in high-quality rails with improved wear resistance with adequate strength and hardness.

In the conventional rail heat treatment method associated with this technique, Korean Patent Publication Nos. 88-3018, 86-5040, 96-4335, and 2001-77052 have been proposed.

Conventional rail heat treatment apparatus and method as disclosed in the above publication has the following problems.

First, in the conventional rail heat treatment apparatus and method, immediately after reheating the bottom of the rail separately and simultaneously with the head, a large amount of power ratio and flow rate of compressed air are required during air quenching, and the nozzle is cooled to room temperature to cool the rail. When spraying water through, there is a serious waste of energy.

Second, the conventional rail heat treatment apparatus and method requires a separate coolant immersion tank or a coolant container to cool the head of the rail, and additional rail rotator for immersion of the rail head requires an initial facility investment and in-line. There are many problems, such as the need for installation space for the (IN-LINE) method.

In particular, the in-line method can be used only in the general rail without a cross-sectional change, the shape is left and right asymmetrical and forged to be used in the tungsten rail formed differently the height of the rail.

Third, the conventional rail heat treatment apparatus and method heats the entire rail by using a flame heat treatment method, not only has a large heat loss, but also difficult to control uniform temperature, severe deformation after heat treatment, and the surface decarburization due to the gas flame is severe rail There is a serious problem of the initial wear.

Therefore, the present invention has been made to solve the above problems, it is easy to cope with the slope between the module according to the rail shaft expansion and installation axis control according to the rail thermal deformation using a universal joint, heat treatment according to the rail deformation The free control of the module maintains a constant distance from the front of the rail head to improve the heat treatment quality of the rail.It is possible to control the temperature uniformly by the medium frequency induction heating method. To provide a head heat treatment apparatus and method for machined asymmetrical rails and forged rails, which can be slack quenched using compressed air and whose cooling capacity can be adjusted through flow control valves and controllers.

The head heat treatment apparatus of the machined asymmetric rail and forged rail according to the present invention for achieving the above object comprises a preheating unit for uniformly heating the entire rail by passing through the rail conveyed through the transfer cart; A main heating unit which reheats the head of the rail which has been preheated to the preheating unit to a predetermined temperature region of more than a stable Ac3 transformation temperature, and a coil is installed to heat the rail top and the head side; A rail slack quenching unit for cooling the rail head with compressed air so that the head of the heated rail is transferred to a constant temperature for a predetermined time, and then the head of the rail is transformed into fine pearlite tissue; Air mist cooling unit and rail head volume in which a high pressure air mist, which is a mixture of water and compressed air, is sprayed to the rail head in multiple stages to prevent bending deformation caused by the temperature difference between the head of the rail and the bottom of the rail. Characterized in that it consists of a control unit for controlling the mother rate according to the change.

The head heat treatment method of the machined asymmetric rail and forged rail according to the present invention for achieving the above object is a step of preheating the entire rail portion of about 400 ~ 650 ℃ in the preheated rail of the material of the coarse perlite structure ; Reheating the head of the rail which has passed the preheating to the constant temperature zone of about 800 to 1020 ° C. above the Ac3 transformation temperature where the austenite structure is stable; After conveying the head of the rail which passed the reheating to the predetermined temperature in the air for a predetermined time, the compressed air is repeatedly sprayed to the head of the rail from the rail slack quenching part so that the head of the rail is transformed into fine pearlite structure. Slack quenching with; In order to prevent bending deformation due to the temperature difference between the rail head and the bottom of the slack quenching, a high pressure air mist, which is a mixture of water and compressed air, is sprayed on the rail head in multiple stages to cool the rail head. Cooling to ~ 250 ℃, characterized in that consisting of the step of naturally cooling the entire portion of the rail to room temperature.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

1 is a front view showing a head heat treatment apparatus of a machined asymmetric rail and forged rail according to the present invention, Figure 2 is an enlarged cross-sectional view showing part A of Figure 1, Figure 3 is an enlarged view of part B of FIG. 4 is an enlarged cross-sectional view of portion C of FIG. 1, and FIG. 5 is a side view showing the head heat treatment apparatus of the machined asymmetric rail and the forged rail according to the present invention.

As shown in these figures, the head heat treatment apparatus of the machined asymmetric rail and forged rail according to the present invention is a preliminary to heat the entirety of the rail 120 or the machined rail 126 is transferred through the feed cart 110 A heating unit 100;

The preheating unit 100 is reheated to a predetermined temperature region of more than the stable Ac3 transformation temperature in the head 122 of the rails 120 and 126 after preheating, and the heads 120 and 126 sides of the rails 120 and 126. The main heating unit 200 is installed so that the coil 130 is heated;

After transferring the head 122 of the heated rails 120 and 126 in the air for a predetermined time so that the head 122 is conducted at a constant temperature, the rails 120 and 126 are transformed into the fine pearlite tissue. 126) a slack quenching unit 300 for cooling the head 122 with compressed air;

The head 122 of the high pressure air mist, which is a mixture of water and compressed air, is cooled to prevent bending deformation due to a temperature difference between the head 122 and the bottom 124 of the rails 120 and 126. It is a heat treatment apparatus (H) consisting of a control unit for controlling the module according to the air head cooling unit 400 and the rail head volume change is installed so that the injection nozzle 410 to be sprayed in multiple stages.

Here, the feed cart 110 is configured so that the front and rear ends are moved up and down in accordance with the progression section so that the rails (120, 126) can pass through the preheating unit 100, the forging rail is different forging height It is configured to maintain the head at a constant height so that the height of the rail support can be adjusted so that the heat treatment can proceed.

In addition, each module constituting the heat treatment device (H) is connected to the universal joint 500, it is configured to control a plurality of installation shafts 510 by the universal joint (500).

In particular, the connection 520 of the universal joint 500 is configured to correspond to the change in the distance between the modules according to the expansion and contraction due to the thermal deformation of the rail (120, 126) by applying the variable shaft 530.

And the control shaft (540, 550) that can be controlled up and down, left and right are connected to the installation shaft 510, and detects the material attached to the sensor to each module, through the programming of the control computer using the information It enables the module control of the feedback, which is configured to maintain a constant distance from the head and to set up uniform heating and cooling conditions.

That is, the head heat treatment apparatus of the processed asymmetric rail and forged rail according to the present invention is the pre-heating unit 100, the main heating unit 200, the slack quenching unit 300, the air mist cooling unit 400 and the control unit organically It is a combination device.

Here, the preheating unit 100 is a portion for heating the entire rail (120, 126) to be transferred through the transport cart 110 to about 400 ~ 650 ℃.

In addition, the preheating of the entire rail (120, 126) is capable of uniform temperature control by heating the rail (120, 126) in the medium frequency induction heating method.

In addition, the preheating unit 100 is provided with a rotation speed adjustment tab 132 for adjusting the induction coil rotation speed, it is possible to adjust the energy input amount according to the shape of the rail (120, 126).

In addition, the main heating unit 200 is a portion which reheats to a temperature region of about 800 to 1000 ° C. which is a temperature higher than the stable Ac 3 transformation point on the head 122 of the rails 120 and 126 that have passed through preheating, and the heating coil 130 is The rails 120 and 126 are provided to heat the front face and the head 122 side.

Here, the preheating unit 100 and the main heating unit 200 is attached to the silicon steel plate 133 to the coil 130 for each part, it is easy to remove the left and right as needed.

This is to allow the silicon steel sheet 133 to align and concentrate the magnetic field to produce high efficiency with less energy.

In addition, the slack quenching unit 300 is transferred to the head (122) of the rail (120, 126) passed through the main heating in a predetermined time, so that the head (122) of the rail (120, 126) Cooling the temperature of the heads 122 of the rails 120 and 126 to 500 ° C. or less so that the 122 is transformed into a fine pearlite structure, and the air jet nozzles toward the head surfaces and the heads 122 of the rails 120 and 126. 410 is installed to slack quench the head 122 of the rails 120 and 126 using high pressure compressed air injected from the injection nozzle 410.

Accordingly, the rail 120 is slack quenched using compressed air, and the cooling capacity can be adjusted through automatic flow rate control.

The air mist cooling unit 400 is a mixture of water and compressed air to prevent bending deformation due to a temperature difference between the head 122 of the rails 120 and 126 and the bottom portion 124 of the rails 120 and 126. The injection nozzle 410 is installed so that the high pressure air mist is sprayed on the head 120 of the rail 120 in multiple stages.

On the other hand, the conveyance trolley 110 minimizes thermal deformation of the rail 120 by varying the interval of the balance according to the rail type, length.

In addition, each module constituting the heat treatment apparatus is connected to the universal joint 500, it is configured to control a plurality of installation shafts 510 by the universal joint 500.

Therefore, each module described above is easy to control the installation shaft 510 according to the thermal deformation of the rail 120 by using the universal joint (500).

In particular, the universal joint 500 is installed between the universal joint 500 connection 520, the thermal deformation of the rail 120 by using a variable shaft 530 of the universal joint 500 connection 520 It is configured to cope with the change in the gap between the modules according to the expansion.

Since the length of the universal joint 500 connection 520 between the variable shaft 530 can be changed, it is easy to cope with the change in the distance between modules according to the expansion and contraction of the rail 120.

And the control shaft (540, 550) that can be controlled up and down, left and right are connected to the installation shaft 510, and detects the material attached to the sensor to each module, through the programming of the control computer using the information It enables the module control of the feedback, which is configured to maintain a constant distance from the head and to set up uniform heating and cooling conditions.

Therefore, due to the use of the control motors 540 and 550 on the upper and lower sides, the rails 120 and 126 are maintained at regular intervals on the head surface through the free control of the heat treatment device H according to the deformation of the rails 120 and 126. ) Heat treatment quality can be improved.

The heat treatment method using the head heat treatment apparatus of the machined asymmetric rail and forged rail according to the present invention having the configuration as described above will be described.

The head heat treatment method of the machined asymmetric rails and forged rails according to the present invention transfers the rails 120 or the machined rails 126 of a coarse pearlite structure in which the chemical composition of carbon steel is metallurgically applied. 110 through the pre-heater to preheat the middle of the rail 120 through the medium frequency induction heating method to about 400 ~ 650 ℃.

Here, the conveyance bogie 110 adjusts the amount of vertical bending different from each other according to the rail type and length, and is equipped with two rail supports so as not to interfere with the preheating pass, the front and rear ends are moved up and down In this case, the level of the rail is raised and lowered so that the height of the rail can be corrected during the heat treatment of the other forged rails.

Subsequently, in order to heat the head 122 of the rails 120 and 126 passed through the preheating to the Ac3 transformation temperature at which the austenitic structure is stable in the main heating part 200, the rails 120 and 126. After positioning on the head surface and the head 122 side of each), only the rails (120, 126) head 122 is reheated to a constant temperature zone.

Subsequently, the head 122 of the rail 120 that has passed through the reheating is transferred from the slack quenching part 300 to the head 120 of the rails 120 and 126 in a predetermined time period so that a uniform temperature is conducted, and then the rail The temperature of the head 122 is cooled to about 500 ° C. or less by using compressed air, and the compressed air is sprayed by the injection nozzles 410 installed on the front face and the head side of the rails 120 and 126. Perform slack quenching.

Subsequently, in order to prevent abnormal deformation of the warpage due to the temperature difference between the head 120 and the bottom 124 of the slack quenching, the air mist cooling unit 400 is a mixture of water and compressed air. Air mist is sprayed on the heads 122 of the rails 120 and 126 in multiple stages to cool the temperature of the heads 122 and 120 to 200 to 250 ° C, and then the rails 120 and 126 to room temperature. Natural cooling of the entire part of the

The head heat treatment apparatus and method of the machined asymmetric rail and forged rail according to the present invention comprising the apparatus and method as described above preheats the entire rails 120, 126, and again the heads 122 of the rails 120, 126. After heating the bay, the compressed air is transformed into fine pearlite structure through the slack quenching heat treatment process, and the air head 120 and 126 is forced to cool the head 122, thereby providing the rails 120 and 126. The strength and hardness of the head 122 is improved to improve the mechanical properties of the wear resistance, in particular the rail (120, 126) to improve the wear resistance according to the hardening of the head 122 to improve the quality of the rail (120, 126), The deformation of the rails 120 and 126 can be minimized, and the production cost can be lowered by using the compressed air only in the slack quenching unit 300, and the rails 120 by the air mist injection after the heat treatment of the rails 120 and 126 are carried out. 126) deflection over the full length Sikimyeo minimized, the operation and effect produced a stable consisting of a high quality of the asymmetric rail (120, 126) and a minor rail (120, 126).

As described above, the head heat treatment apparatus and method of the machined asymmetric rail and forged rail according to the present invention has the following effects.

First, the present invention improves the wear resistance by increasing the physical properties such as the strength and hardness of the rail head, and in particular, to improve the quality of the rail by improving the depth of the core hardness in the processing part by heat treatment of the processed rail head, Deformation can be minimized, and the heat treatment of the rail minimizes the up and down bending over the entire length of the rail and the left and right bending deformation due to the left and right asymmetry. There is.

Second, the present invention is easy to control the installation axis according to the rail thermal deformation by using the universal joint, and easy to cope with the slope between the modules according to the rail expansion and contraction by using the variable length universal joint connection, the control motor on the top, bottom, left and right By using it, it is possible to improve the heat treatment quality of the rail by maintaining a certain distance from the front face of the rail head through the free control of the heat treatment module according to the rail deformation, and by adopting the medium frequency induction heating method, the uniform temperature control of the rail is possible. It can improve the quality, slack quenching using compressed air, and it is possible to adjust the amount of power and current according to the volume change of the rail head through the control unit, and to control the air mist and compressed air, thereby improving the heat treatment quality. There is an advantage.

Third, the present invention is to raise and lower the front and rear end support of the transfer bogie up and down, by adjusting the height, the head height is the same but the bottom height is generated, so that the work of the forged rail of the roller type heat treatment apparatus mainly difficult to work Since the heat treatment is possible, there is a great advantage in applying the heat treated rail between the turnout bulb.

Claims (8)

A preheating unit 100 of a medium frequency induction heating method to uniformly heat the entirety of the rails 120 and 126 transferred through the transport cart 110; Reheats the head 122 of the rails 120 and 126, which have been preheated to the preheater 100, to a predetermined temperature zone above the stable Ac3 transformation temperature, and the rails 120 and 126 face the head and the head 122 side. A main heating unit 200 in which the coil 130 is installed to be heated; After transferring the head 122 of the heated rails 120 and 126 in the air for a predetermined time so that the head 122 is conducted at a constant temperature, the rails 120 and 126 are transformed into the fine pearlite tissue. 126) rails 120 and 126 slack quenching unit 300 for cooling the head 122 with compressed air; The high pressure air mist, which is a mixture of water and compressed air, is cooled to prevent bending deformation due to a temperature difference between the head 122 of the rails 120 and 126 and the bottom part 124 of the rails 120 and 126. 126) The machined asymmetric rail and forging, characterized in that the head 122 is composed of an air mist cooling unit 400 is installed in a multi-stage injection nozzle 410 and a control unit for controlling the module according to the change in the volume of the rail head Head heat treatment device of the rail. The method of claim 1, The transfer cart 110 is equipped with two rail supports so as not to interfere with the preheating pass, the front and rear ends are lifted up and down, and the rail height is lowered to correct the height of the heat treatment of different forged rails A head heat treatment apparatus for machined asymmetrical rails and forged rails, which is configured to adjust the degree. The method of claim 1, The module is connected to the universal joint 500, the head heat treatment apparatus of the machined asymmetric rail and forged rail, characterized in that the plurality of installation shafts (510) is controlled by the universal joint (500). The method of claim 1, The universal joint 500 is installed between the universal joint connection 520, characterized in that configured to correspond to the stretching of the rail (120, 126) using a variable shaft 530 of the universal joint connection 520. Head heat treatment device of machined asymmetric rail and forged rail. The method of claim 1, Up and down, left and right control motors 540 and 550 are connected to the installation shaft 510, and the front and rear rails 120 and 126 are freely controlled by the heat treatment device by the up and down and left and right control motors 540 and 550. A head heat treatment apparatus for a machined asymmetrical rail and forged rail, characterized in that a constant gap is inverted. The method of claim 1, The preheating unit 100 is the rotation speed adjustment tab 132 is installed to adjust the rotation speed of the coil 130, the process characterized in that the configuration is configured to enable the energy input amount according to the rail (120, 126) shape Heat treatment apparatus of asymmetrical rail and forged rails. Preheating the entire portions of the rails 120 and 126 to about 400 to 650 ° C. through the medium frequency induction heating method in the preheating unit 100 to the rails 120 and 126 of the material of the coarse perlite structure; Reheating the head 122 of the rails 120 and 126 that have passed through preheating in a constant temperature region of about 800 to 1020 ° C. above the Ac3 transformation temperature where the austenite structure is stable; After transferring the head 122 of the rails 120 and 126 having passed through the reheating in a predetermined period of time so that the head 122 of the rails 120 and 126 is conducted at a constant temperature, the rails 120 and 126 may be transformed into a fine pearlite structure. 120, 126) slack quenching by repeatedly spraying compressed air to the head (122, 120) 126 in the slack quenching unit 300; High-pressure air mist that is a mixture of water and compressed air in the air mist cooling unit 400 to prevent bending deformation due to the temperature difference between the heads 122 and the bottom 124 of the slack quenching rails 120 and 126. To the heads 122 of the rails 120 and 126 in multiple stages, thereby cooling the temperature of the heads 122 and 120 of the rails 120 and 126 to 200 to 250 ° C, and A method for heat treatment of the head of machined asymmetrical rails and forging rails, characterized by naturally cooling steps. The method of claim 7, wherein The conveyance bogie 110 adjusts the amount of vertical bending different from each other according to the rail type and length, and is equipped with two rail supports so as not to interfere with the preheating pass, the front and rear ends are moved up and down, one A head heat treatment method for a machined asymmetric rail and forged rails, in which the height of the rail is lowered to adjust the height of the rail so that the height of the rail is different during the heat treatment of the forged rail.

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