Turnout TY wing rail heat treatment process

Abstract

The invention provides a turnout TY wing rail heat treatment process, and relates to the technical field of steel rail heat treatment, and the turnout TY wing rail heat treatment process comprises the following steps: adjusting magnetic field distribution of a magnetic induction heating mechanism, so that the magnetic field density of a top heating space formed by a top coil is greater than the magnetic field density of a first heating space and the magnetic field density of a second heating space; the top coil is connected to the first side coil through the first arc-shaped coil, and the top coil is connected to the second side coil through the second arc-shaped coil; the radius R1 of the first arc-shaped coil is adjusted, and the value range of R1 is within 17-19 mm; the radius R2 of the second arc-shaped coil is adjusted, and the value range of R2 is within 17-19 mm; the rail head is matched with the magnetic induction heating mechanism, the magnetic induction heating mechanism and the turnout TY wing rail move relatively in the extending direction of the turnout TY wing rail, and the rail head is heated through the magnetic induction heating mechanism. The steel rail obtained through heat treatment of the process is high in quality.

Description

Technical Field

[0001] The invention relates to the technical field of rail heat treatment, and in particular to a heat treatment process for a turnout TY wing rail. Background Art

[0002] Please combine Figure 1-Figure 3 TY wing rail is one of the key components in high-speed railway turnouts. Its function is to guide the wheels to pass through the switch smoothly, avoid direct collision between the wheels and the switch heart rail, and ensure driving safety. The TY wing rail section is a special asymmetric section, and is connected to the line rail, so that it forms a structural form with a symmetrical standard rail section at one end and an asymmetric irregular section at the other end (this part mainly acts as a frame). In order to extend the service life of the wing rail, it is necessary to heat treat its rail head to improve its working surface hardness and increase wear resistance. In the prior art, the medium-frequency induction heating method is generally used to quench the rail head in the working section of the wing rail. Since the width of the rail head is inconsistent after the wing rail is processed, and the width range is large, the thick rail head of the wide section and the asymmetry of the entire section bring great challenges to the uniformity of the overall temperature of the rail head. Affected by the characteristics of induction heating, the temperature of the rail after heating is mainly concentrated on the surface of the rail, and the "wide and flat" rail head makes it impossible for the core to be fully heated through. A "dark" area is formed in the center of the tread of the rail head, and the heating layer is insufficient, resulting in the depth and hardness distribution of the tread hardened layer not meeting the standard requirements after cooling.

[0003] The inventors have found that the existing TY wing rail heat treatment process has at least the following disadvantages:

[0004] In order to make the heating temperature of the tread meet the requirements, it is generally achieved by increasing the power of the induction heating equipment and / or reducing the moving speed of the wing rail relative to the induction heating equipment. In this way, although the heating temperature of the tread can be increased, it also brings about the heat concentration on the curved surface of the side of the rail head, the risk of overheating or even overburning, and there are safety hazards. That is, the wing rail heat treatment of the prior art cannot simultaneously meet the requirements of uniform heating temperature of the tread and the curved surface of the side. Summary of the invention

[0005] The object of the present invention is to provide a heat treatment process for a turnout TY wing rail, which can reduce the risk of overheating and overburning of the side curved surface while ensuring that the heating temperature of the tread is increased, reduce safety hazards, and improve the heat treatment quality of the wing rail.

[0006] The embodiment of the present invention is achieved as follows:

[0007] In a first aspect, the present invention provides a heat treatment process for a turnout TY wing rail, wherein the turnout TY wing rail comprises a connected rail head, a rail waist and a rail bottom, wherein the rail head comprises a working surface, a tread surface and a non-working surface connected in sequence, wherein the working surface and the non-working surface are located on both sides of the tread surface, wherein a connection between the working surface and the tread surface forms a first curved surface, and a connection between the non-working surface and the tread surface forms a second curved surface; the heat treatment process comprises the following steps:

[0008] Step s100, adjusting the magnetic field distribution of the magnetic induction heating mechanism so that the magnetic field density of the top heating space formed by the top coil of the magnetic induction heating mechanism is greater than the magnetic field density of the first heating space formed by the first side coil of the magnetic induction heating mechanism and the magnetic field density of the second heating space formed by the second side coil, one side of the top coil is connected to the first side coil through the first arc coil, and the other side of the top coil is connected to the second side coil through the second arc coil;

[0009] Step s200, adjusting the radius R1 of the first arc coil so that the value range of R1 is between 17-19 mm; adjusting the radius R2 of the second arc coil so that the value range of R2 is between 17-19 mm;

[0010] Step s300, the rail head is matched with a magnetic induction heating mechanism, so that the magnetic induction heating mechanism and the turnout TY wing rail move relative to each other in the extension direction of the turnout TY wing rail, and the rail head is heated by the magnetic induction heating mechanism.

[0011] In an optional embodiment, in the step s100, a magnetic conductor is installed above the top coil so that the magnetic field density of the top coil is greater than the magnetic field density of the first side coil and the second side coil.

[0012] In an optional embodiment, the width of the magnetic conductor is set to (55-65)% of the width of the rail head.

[0013] In an optional embodiment, in step s300, an air jet mechanism is arranged on a side of the magnetic induction heating mechanism away from the forward direction of the rail head, and after the rail head is heated by the magnetic induction heating mechanism, the air jet mechanism is used to spray air toward the rail head to achieve under-quenching heat treatment.

[0014] In an optional embodiment, the distance between the air outlet of the air jet mechanism and the tread is set to 22-25 mm.

[0015] In an optional embodiment, the rail head includes a first rail segment, a transition rail segment and a second rail segment connected in its extension direction, the width of the first rail segment is smaller than the width of the second rail segment, and the width of the transition rail segment gradually increases from the first rail segment to the second rail segment;

[0016] In the step s300, with the end of the first rail segment as the front end, the magnetic induction heating mechanism and the switch TY wing rail are moved relative to each other in the extension direction of the switch TY wing rail.

[0017] In an optional embodiment, when heat treating the first rail segment, the heating power of the magnetic induction heating mechanism is set to 100-150kW, the movement speed of the rail head relative to the magnetic induction heating mechanism is set to 400±50mm / min, and the wind pressure acting on the tread of the first rail segment is set to 0.15-0.35MPa.

[0018] In an optional embodiment, when heat treating the transition rail segment, the heating power of the magnetic induction heating mechanism is set to 150-180 kW, the movement speed of the rail head relative to the magnetic induction heating mechanism is set to 400±50 mm / min, and the wind pressure acting on the tread of the transition rail segment is set to 0.15-0.35 MPa.

[0019] In an optional embodiment, when heat treating the second rail segment, the heating power of the magnetic induction heating mechanism is set to 140-160kW, the movement speed of the rail head relative to the magnetic induction heating mechanism is set to 300±50mm / min, and the wind pressure acting on the tread of the second rail segment is set to 0.15-0.35Mpa.

[0020] In an optional embodiment, a milling position is provided on the second rail segment, and starting from the starting point of the milling position and moving in a direction away from the first rail segment at a position not less than the width of a double-turn magnetic induction heating coil is used as an end point, and the quenching area on the second rail segment terminates at the end point.

[0021] The beneficial effects of the embodiments of the present invention are:

[0022] In summary, in the heat treatment process for the turnout TY wing rail provided in the present embodiment, when the magnetic induction heating mechanism is used to heat the rail head, the rail head is simultaneously arranged in the first heating space, the top heating space, and the second heating space. The top coil of the magnetic induction heating mechanism corresponds to the tread of the rail head, the first arc coil corresponds to the first arc surface, the first side coil corresponds to the working surface, the second side coil corresponds to the non-working surface, and the second arc coil faces the second arc surface. At the same time, the magnetic field density of the top heating space is greater than the magnetic field density of the first heating space and the second heating space. That is, by adjusting the magnetic field distribution density of the magnetic induction heating mechanism, better utilization of the dense The magnetic field generates a larger induced current at the tread, thereby increasing the heating temperature of the tread and making the dark area on the tread of the rail head disappear. In addition, the radius of the first arc coil is controlled between 17-19mm, and the radius of the second arc coil is controlled between 17-19mm, which increases the distance between the first arc coil and the first arc surface and between the second arc coil and the second arc surface. The first arc surface and the second arc surface are subjected to moderate heat and are not prone to overheating or even overburning. In this way, the tread, the first arc surface and the second arc surface are heated evenly, and the depth and distribution of the tread hardening layer and the microstructure at the fillet of the rail head meet the design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic diagram of a turnout TY wing rail according to an embodiment of the present invention;

[0025] Figure 2 AA is a schematic diagram of an embodiment of the present invention;

[0026] Figure 3 BB is a schematic diagram of an embodiment of the present invention;

[0027] Figure 4 It is a schematic diagram of the cooperation between the magnetic induction heating mechanism and the rail head according to an embodiment of the present invention.

[0028] icon:

[0029] 001-wing rail; 011-rail head; 012-working surface; 013-tread; 014-non-working surface; 015-first arc surface; 016-second arc surface; 017-first rail section; 0171-toe end; 018-transition rail section; 019-second rail section; 0191-heel end; 0192-milling position; 002-rail waist; 003-rail bottom; 100-magnetic induction heating mechanism; 110-top coil; 111-top heating space; 120-first side coil; 121-first heating space; 130-second side coil; 131-second heating space; 140-first arc coil; 150-second arc coil; 160-magnetic conductor; 170-heating fin. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the prior art, in order to make the heating temperature of the tread 013 of the rail head 011 meet the requirements, it is generally achieved by increasing the power of the induction heating mechanism and reducing the vehicle speed to extend the heating time. Although the heating temperature of the tread 013 of the rail head 011 can be increased, the heating temperature of the rounded corners on both sides of the rail head 011 is also increased. The reason is that the rounded corners on both sides of the rail head 011 are located at the junction of the top heating area and the side heating area of ​​the induction heating mechanism, and are heated by the top heating area and the side heating area at the same time. The heat is concentrated and the temperature is high. If the temperature of the top heating area is increased, the temperature at the rounded corners of the rail head 011 will inevitably increase. In this way, the rounded corners of the rail head 011 are prone to overheating or even overburning due to excessively high temperature, affecting the heat treatment quality of the rail head 011.

[0037] In view of this, the designer provides a heat treatment process for the turnout TY wing rail 001, which can not only increase the heat treatment temperature of the rail head 011 tread 013 of the turnout TY wing rail 001, so that the hardness depth and hardness distribution range of the rail head 011 tread 013 meet the standard requirements, but also increase the heating temperature of the rounded corners of the rail head 011, and the rounded corners of the rail head 011 are not prone to overheating and overburning, and the heat treatment quality is high.

[0038] Please combine Figure 1-Figure 3, wherein the turnout TY wing rail 001 includes a rail head 011, a rail waist 002 and a rail bottom 003 connected to each other. The rail head 011 has a working surface 012, a tread 013 and a non-working surface 014 connected in sequence in its width direction, the working surface 012 and the non-working surface 014 are located on both sides of the tread 013, the connection between the working surface 012 and the tread 013 forms a first curved surface 015, and the connection between the non-working surface 014 and the tread 013 forms a second curved surface 016. The fillet position of the rail head 011 is the position where the first curved surface 015 and the second curved surface 016 are located. During actual processing, the first curved surface 015 and the second curved surface 016 can be partial circular surfaces. Moreover, in actual application, the width of the rail head 011 is not always equal in its extension direction. Generally, the rail head 011 includes a first rail segment 017, a transition rail segment 018 and a second rail segment 019 connected in its extension direction. The width of the first rail segment 017 is smaller than the width of the second rail segment 019, and the width of the transition rail segment 018 gradually increases from the first rail segment 017 to the second rail segment 019. It should be understood that the width of the first rail segment 017 can be set at about 71 mm, the width of the second rail segment 019 can be set at about 110 mm, and the transition rail segment 018 is a gradual change, gradually increasing from 71 mm to 110 mm.

[0039] The steps of the heat treatment process of the turnout TY wing rail 001 provided in this embodiment are as follows:

[0040] Step s100, adjusting the magnetic field distribution of the magnetic induction heating mechanism 100, so that the magnetic field density of the top heating space 111 formed by the top coil 110 of the magnetic induction heating mechanism 100 is greater than the magnetic field density of the first heating space 121 formed by the first side coil 120 of the magnetic induction heating mechanism 100 and the magnetic field density of the second heating space 131 formed by the second side coil 130, one side of the top coil 110 is connected to the first side coil 120 through the first arc coil 140, and the other side of the top coil 110 is connected to the second side coil 130 through the second arc coil 150, and during quenching, the first side coil 120 and the second side coil 130 are arranged in the width direction of the rail head 011;

[0041] Step s200, adjusting the radius R1 of the first arc coil 140 so that the value range of R1 is between 17-19 mm; adjusting the radius R2 of the second arc coil 150 so that the value range of R2 is between 17-19 mm;

[0042] Step s300 , the rail head 011 is matched with the magnetic induction heating mechanism 100 , so that the magnetic induction heating mechanism 100 and the turnout TY wing rail 001 move relative to each other in the extension direction of the turnout TY wing rail 001 , and the rail head 011 is heated by the magnetic induction heating mechanism 100 .

[0043] It should be noted that the order of step s100 and step s200 is not specifically limited and can be adjusted accordingly according to actual conditions.

[0044] Based on the above, the heat treatment process of the turnout TY wing rail 001 provided in this embodiment has at least the following advantages:

[0045] When the magnetic induction heating mechanism 100 is used to heat the rail head 011, the wing rail 001 is positioned on the walking mechanism, and the walking mechanism can drive the entire wing rail 001 to move linearly in a preset direction, thereby driving the rail head 011 to move relative to the magnetic induction heating mechanism 100. When the rail head 011 reaches the position of the magnetic induction heating mechanism 100, the top coil 110 of the magnetic induction heating mechanism 100 corresponds to the tread 013 of the rail head 011, the first arc coil 140 corresponds to the first arc surface 015, the first side coil 120 corresponds to the working surface 012, the second side coil 130 corresponds to the non-working surface 014, and the second arc coil 150 corresponds to the second arc surface 016. At the same time, the magnetic field density of the top heating space 111 is greater than the magnetic field density of the first heating space 121 and the magnetic field density of the second heating space 131, that is, by adjusting the magnetic field distribution density of the magnetic induction heating mechanism 100, the dense magnetic field is better utilized to generate a larger induced current at the tread 013, thereby increasing the heating temperature of the tread 013, so that the dark area of ​​the tread 013 of the rail head 011 disappears, and the radius of the first arc coil 140 is controlled between 17-19 mm, and the radius of the second arc coil 150 is controlled between 17-19 mm, so that the first arc coil 140 The distance between the first curved surface 015 and the second curved coil 150 and the second curved surface 016 increases, the magnetic field formed at the first curved coil 140 is away from the first curved surface 015, and the magnetic field formed at the second curved coil 150 is away from the second curved surface 016. The heat received by the first curved surface 015 and the second curved surface 016 is moderate, and overheating or even overburning is not likely to occur. In this way, the tread 013, the first curved surface 015 and the second curved surface 016 are heated evenly, the depth and distribution of the hardened layer of the tread 013 and the microstructure at the fillet of the rail head 011 all meet the design requirements, and the heat treatment quality is high.

[0046] The following embodiments illustrate the details of the heat treatment process of the turnout TY wing rail 001 provided in this application by way of examples.

[0047] In this embodiment, optionally, the method of adjusting the magnetic field distribution of the top coil 110 is selected as needed. In this embodiment, the magnetic field distribution density of the top coil 110 is increased by installing a magnetic conductor 160 above the top coil 110, so that the magnetic field density of the top coil 110 is greater than the magnetic field density of the first side coil 120 and the second side coil 130.

[0048] Among them, the dimension of the magnetizer 160 in the width direction of the rail head 011 is set to (55-65)% of the width of the rail head 011, that is, the width dimension of the magnetizer 160 is (55-65)% of the width dimension of the rail head 011, for example, the width dimension of the magnetizer 160 is 55%, 60% or 65% of the width dimension of the rail head 011, and the position of the magnetizer 160 is symmetrical with respect to the center line of the rail head 011, and the center line of the magnetizer 160 basically coincides with the center line of the rail head 011. In this way, the magnetizer 160 increases the local magnetic field density of the top coil 110, and has little effect on the magnetic field of the top coil 110 close to the first side coil 120 and the second side coil 130. It is not easy to increase the temperature of the top coil 110 at the rounded corner of the rail head 011, and reduces the effect of the magnetic field adjustment of the top coil 110 on the heating of the rounded corner of the rail head 011.

[0049] It should be understood that due to the design of the magnetic conductor 160, the local magnetic field of the top coil 110 changes, the heating power increases, and the temperature is higher. In order to ensure good heat dissipation, heat dissipation fins 170 are installed above the top coil 110. The number and arrangement of the heat dissipation fins 170 are selected as needed to avoid the top coil 110 from having an excessively high temperature and affecting normal use.

[0050] In this embodiment, optionally, the value of R1 can be 17 mm, 18 mm or 19 mm, etc., and the value of R2 can be 17 mm, 18 mm or 19 mm, etc. For example, in this embodiment, the first arc coil 140 and the second arc coil 150 are symmetrically arranged, and the radius of both is 18 mm. The distance between the first arc coil 140 and the first arc surface 015 is moderate, the distance between the second arc coil 150 and the second arc surface 016 is moderate, and the temperature at the two fillets of the rail head 011 is moderate, and overheating or overburning is not likely to occur.

[0051] In addition, the first arc coil 140 and the second arc coil 150 are arranged symmetrically, and their setting positions are basically the same. Among them, the distance between the center of any arc coil and the center of the rounded corner of the rail head 011 can be set at 21-23mm to ensure that the rounded corner of the rail head 011 is not easy to overburn.

[0052] In this embodiment, optionally, when heat treatment is performed, the wing rail 001 needs to move relative to the magnetic induction heating mechanism 100, and the wing rail 001 is driven by the walking mechanism to adaptively adjust the moving speed relative to the magnetic induction heating mechanism 100. For example, when the heating temperature needs to be increased, the relative movement speed of the two can be slowed down or the power of the magnetic induction heating mechanism 100 can be increased. In this embodiment, the magnetic induction heating mechanism 100 is relatively stationary, and the wing rail 001 is driven by the walking mechanism to move relative to the magnetic induction heating mechanism 100 as an example for description.

[0053] When the two move relative to each other, the walking mechanism drives the wing rail 001 to move relative to the magnetic induction heating mechanism 100 with the end of the first rail section 017 as the front end, which can be called the toe end 0171. Correspondingly, the end of the second rail section 019 is the tail end, which can also be called the heel end 0191. That is to say, the magnetic induction heating mechanism 100 performs heat treatment on the rail head 011 in the direction from narrow to wide. Specifically, the first rail section 017 of the rail head 011 is first heat treated, then the transition rail section 018 is heat treated, and finally the second rail section 019 is heat treated. It is worth noting that during the heat treatment, quenching is gradually performed from the first rail section 017 to the second rail section 019. The reason is that the quenching of the wing rail 001 belongs to the local heating of the rail head 011. Under the mixed effect of thermal stress and structural stress, after quenching and cooling, bending deformation with warping at both ends and concave in the middle will be generated, which will bring great pressure to the adjustment process after heating. At the same time, in order to straighten the rail longitudinally, a large mechanical external force needs to be applied to it, which will have a negative effect on the quality of the rail. Therefore, it is necessary to perform reverse deformation treatment on the quenched rail during quenching to balance the effects of thermal stress and structural stress. If the rail is quenched from the middle to the toe end 0171, that is, the second rail section 019 is quenched in the direction of the first rail section 017, when the magnetic induction heating mechanism 100 moves to the end, the rail is heated and deformed and the reverse deformation is applied, resulting in the rail being in a curved state with a convex middle after heating. The top surface of the rail head 011, that is, the tread 013, is inconsistent with the front and rear positions of the magnetic induction heating mechanism 100, resulting in uneven temperatures at different positions on the rail within the length range of the last magnetic induction heating mechanism 100, and the heat treatment quality is affected. Therefore, in this embodiment, the quenching is carried out from the first rail section 017 to the second rail section 019. When the quenching starts, since the reverse deformation has not been applied to the rail member, the distance between the rail top of each part and the magnetic induction heating mechanism 100 is consistent; and on the second rail section 019, starting from the starting point of the milling position 0192, the position not less than the width of a double-turn magnetic induction heating coil in the direction away from the first rail section 017 is used as the end point. The first rail section 017 is first heat-treated, which reduces the influence of deformation on the heat treatment quality during the treatment of the rail body. Starting from the starting point of the milling position 0192, the remaining position away from the first rail section 017 (that is, the frame part) does not directly contact the wheel and only plays the role of frame support. Therefore, the frame part has lower heat treatment requirements than the first rail section 017, and there are no technical requirements such as hardness and hardened layer depth. The magnetic induction heating mechanism 100 can be used to heat treat the area between the starting point and the end point, that is, the quenching area on the second rail section 019 ends at the end point, saving energy consumption.

[0054] In this embodiment, the toe end 0171 is used as the front end and the heel end 0191 is used as the tail end. The toe end 0171 has higher requirements and is first heat treated. During the heat treatment, the deformation of the wing rail 001 is small, which has little effect on the heat treatment of the toe end 0171. The heat treatment quality of the toe end 0171 is high. Correspondingly, the heat treatment quality of the first rail segment 017 and the transition rail segment 018 is high. As for the second rail segment 019, due to its particularity in the service process, the deformation amount can be reduced in the area after the milling position 0192 by reducing the heating temperature, thereby improving the heat treatment effect and reducing energy consumption.

[0055] For example, during the heat treatment process, after entering the second rail segment 019 and performing heat treatment on part of the second rail segment 019, when the magnetic induction heating mechanism 100 is in the area where the heat treatment starts from the starting point of the milling position on the second rail segment 019 and ends in a direction away from the first rail segment 017 with a position not less than the width of a double-turn magnetic induction heating coil, the heating power of the magnetic induction heating mechanism 100 can be gradually reduced or the heating can be stopped directly.

[0056] It should be noted that after heating the rail head 011, the heated rail head 011 needs to be cooled down quickly for quenching. For example, in this embodiment, an air jet mechanism is arranged on the side of the magnetic induction heating mechanism 100 away from the advancing direction of the rail head. After the rail head 011 is heated by the magnetic induction heating mechanism 100, the air jet mechanism is used to spray air toward the rail head 011 to achieve under-speed quenching heat treatment. The air jet mechanism can spray high-pressure gas to achieve quenching. The distance between the air outlet of the air jet mechanism and the tread 013 is set to 22-25 mm. For example, the distance between the air outlet of the air jet mechanism and the tread 013 is set to 22 mm, 22.5 mm or 25 mm, etc.

[0057] The following provides a specific process scheme for the heat treatment process of the turnout TY wing rail 001 of this embodiment.

[0058] After the rail head 011 is paired with the magnetic induction heating mechanism 100, the distance between the tread 013 of the rail head 011 and the top coil 110 can be 6-8 mm. The distance between the air outlet of the air jet mechanism and the tread 013 can be set to 22-25 mm. When heat treating the first rail section 017, the heating power of the magnetic induction heating mechanism 100 is set to 100-150 kW, the movement speed of the rail head 011 relative to the magnetic induction heating mechanism 100 is set to 400±50 mm / min, and the wind pressure acting on the tread 013 of the first rail section 017 is set to 0.15-0.35 MPa.

[0059] When heat treating the transition rail segment 018, the heating power of the magnetic induction heating mechanism 100 is set to 150-180kW, the movement speed of the rail head 011 relative to the magnetic induction heating mechanism 100 is set to 400±50mm / min, and the wind pressure acting on the tread 013 of the transition rail segment 018 is set to 0.15-0.35MPa.

[0060] When heat treating the second rail segment 019, the heating power of the magnetic induction heating mechanism 100 is set to 140-160kW, the movement speed of the rail head 011 relative to the magnetic induction heating mechanism 100 is set to 300±50mm / min, and the wind pressure acting on the tread 013 of the second rail segment 019 is set to 0.15-0.35Mpa.

[0061] It should be noted that parameters such as the power of the magnetic induction heating mechanism 100, the moving speed of the walking mechanism and the wind pressure of the air jet mechanism can all be automatically controlled through a digital control system. The control is flexible and convenient, with high accuracy and small error, which can greatly improve the quality and efficiency of heat treatment.

[0062] In addition, in other embodiments, the first side coil 120 and the second side coil 130 can be moved down a set distance relative to the tread 013 of the rail head 011, so that the heating area of ​​the working surface 012 and the non-working surface 014 can be increased, ensuring that the hardness depth distribution of the tread 013, the non-working surface 014 and the working surface 012 is uniform. Figure 4 ,The area where the section line on the rail head 011 is located represents the hardness depth distribution area.

[0063] The heat treatment process for the turnout TY wing rail 001 provided in this embodiment can meet the requirement of increasing the heating temperature of the rail head 011 tread 013 while reducing the risk of overheating and overburning of the fillet of the rail head 011 by adjusting the magnetic field distribution of the magnetic induction heating mechanism 100 and adjusting the movement direction of the wing rail 001 relative to the magnetic induction heating mechanism 100, and ensure the quenching quality of the toe end 0171, so that the heat treatment quality of the entire wing rail 001 is high and meets the standard requirements.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A heat treatment process for a turnout TY wing rail, wherein the turnout TY wing rail comprises a connected rail head, a rail waist and a rail bottom, wherein the rail head has a working surface, a tread surface and a non-working surface connected in sequence, wherein the working surface and the non-working surface are located on both sides of the tread surface, wherein the connection between the working surface and the tread surface forms a first curved surface, and the connection between the non-working surface and the tread surface forms a second curved surface; characterized in that: The heat treatment process includes the following steps: Step s100, adjusting the magnetic field distribution of the magnetic induction heating mechanism so that the magnetic field density of the top heating space formed by the top coil of the magnetic induction heating mechanism is greater than the magnetic field density of the first heating space formed by the first side coil of the magnetic induction heating mechanism and the magnetic field density of the second heating space formed by the second side coil, one side of the top coil is connected to the first side coil through the first arc coil, and the other side of the top coil is connected to the second side coil through the second arc coil; Step s200, adjusting the radius R1 of the first arc coil so that the value range of R1 is between 17-19 mm; adjusting the radius R2 of the second arc coil so that the value range of R2 is between 17-19 mm; Step s300, the rail head is matched with a magnetic induction heating mechanism, so that the magnetic induction heating mechanism and the turnout TY wing rail move relative to each other in the extension direction of the turnout TY wing rail, and the rail head is heated by the magnetic induction heating mechanism.

2. The turnout TY wing rail heat treatment process according to claim 1, characterized in that: In the step s100, a magnetic conductor is installed above the top coil so that the magnetic field density of the top coil is greater than the magnetic field density of the first side coil and the second side coil.

3. The turnout TY wing rail heat treatment process according to claim 2, characterized in that: The width of the magnetic conductor is set to be (55-65)% of the width of the rail head.

4. The turnout TY wing rail heat treatment process according to claim 1, characterized in that: In step s300, an air jet mechanism is arranged on a side of the magnetic induction heating mechanism away from the advancing direction of the rail head, and after the rail head is heated by the magnetic induction heating mechanism, the air jet mechanism is used to spray air toward the rail head to achieve under-quenching heat treatment.

5. The turnout TY wing rail heat treatment process according to claim 4, characterized in that: The distance between the air outlet of the air jet mechanism and the tread is set to 22-25 mm.

6. The turnout TY wing rail heat treatment process according to claim 1, characterized in that: The rail head includes a first rail segment, a transition rail segment and a second rail segment connected in its extension direction, the width of the first rail segment is smaller than the width of the second rail segment, and the width of the transition rail segment gradually increases from the first rail segment to the second rail segment; In the step s300, with the end of the first rail segment as the front end, the magnetic induction heating mechanism and the switch TY wing rail are moved relative to each other in the extension direction of the switch TY wing rail.

7. The turnout TY wing rail heat treatment process according to claim 6, characterized in that: When heat treating the first rail segment, the heating power of the magnetic induction heating mechanism is set to 100-150kW, the movement speed of the rail head relative to the magnetic induction heating mechanism is set to 400±50mm / min, and the wind pressure acting on the tread of the first rail segment is set to 0.15-0.35MPa.

8. The turnout TY wing rail heat treatment process according to claim 6, characterized in that: When heat treating the transition rail segment, the heating power of the magnetic induction heating mechanism is set to 150-180kW, the movement speed of the rail head relative to the magnetic induction heating mechanism is set to 400±50mm / min, and the wind pressure acting on the tread of the transition rail segment is set to 0.15-0.35MPa.

9. The turnout TY wing rail heat treatment process according to claim 6, characterized in that: When heat treating the second rail segment, the heating power of the magnetic induction heating mechanism is set to 140-160kW, the movement speed of the rail head relative to the magnetic induction heating mechanism is set to 300±50mm / min, and the wind pressure acting on the tread of the second rail segment is set to 0.15-0.35Mpa.

10. The turnout TY wing rail heat treatment process according to claim 6, characterized in that: A milling position is arranged on the second rail segment. Starting from the starting point of the milling position and moving away from the first rail segment, a position not less than the width of a double-turn magnetic induction heating coil is taken as an end point, and the quenching area on the second rail segment terminates at the end point.

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