Fixed frog die forging point rail structure

Abstract

The utility model provides a fixed frog die forging point rail structure. The fixed frog die forging point rail structure is formed by overall die forging of wedge-shaped point rails and swallow-tailed spacer iron. A toe end step is arranged at the upper part of the wedge-shaped point rail toe end; a heel end step is arranged at the lower part of the heel end of the swallow-tailed spacer iron; a heel end positioning surface is arranged at the upper part of the heel end of the swallow-tailed spacer iron; 2-10 mm machining amount is reserved between the die forging contour and the finished product contour. The die is simple in structure, high in production efficiency, low in manufacturing cost, high in precision, high in material utilization rate and production efficiency, reliable in overall strength and capable of effectively improving product safety.

Description

Technical Field

[0001] The utility model belongs to the technical field of railway switches, and in particular relates to a fixed frog die-forged heart rail structure. Background Art

[0002] A frog is a track structure that transfers wheels from one rail to another. Fixed combination frogs are widely used on existing and heavy-load lines in my country with speeds below 160 km / h due to their simple processing, low cost, and ease of installation. They consist of an alloy steel center rail (made of forged manganese steel or other wear-resistant materials), a fork rail, wing rails, and spacers, assembled with high-strength bolts. The center rail's high wear resistance extends the frog's overall service life. The core of a fixed frog is the alloy steel center rail, which is primarily machined from expensive flat steel, resulting in low material utilization and high manufacturing costs.

[0003] Patent document ZL201810610546.7, currently in development, relates to a high-strength, long-life bainitic flat steel for railway frogs and its production method. The steel is smelted in a conventional converter and then refined in a refining unit. Low-basicity final slag is used for desulfurization and inclusion removal, followed by RH degassing and inclusion removal. The molten steel is then cast into continuous casting billets and rolled into large-sized flat steel. This patented technology is a rough processing method for flat steel, resulting in low material utilization.

[0004] Patent document ZL201420625580.9 relates to an I-shaped fork rail, which is mainly a long strip fork rail body. The fork rail body is composed of a fork rail body front end, a fork rail body waist, and a fork rail body tail, all of which are trapezoidal in top view. The long side of the trapezoidal surface of the fork rail body front end is connected and overlapped with the long side of the trapezoidal surface of the fork rail body waist when viewed from above. The short side of the trapezoidal surface of the fork rail body waist when viewed from above is connected and overlapped with the short side of the trapezoidal surface of the fork rail body tail when viewed from above. Grooves are provided on both sides of the fork rail body along the extension direction of the fork rail body, and screw holes for fixing are provided at equal intervals in the grooves along the extension direction of the grooves on the fork rail body. An additional part for vehicle travel and structural connection is provided on the upper side of the fork rail body. This patented technology reduces processing costs and saves materials by providing grooves on both sides of the body, but the overall strength is also reduced, posing a safety risk.

[0005] Patent document ZL202020476615.2 relates to a frog core forging die, which includes a lower die base, a lower die, a left module, a right module, an upper die base, a lifting ring, and an upper die. The lower die is matched and inlaid in the center of the top surface of the lower die base, and the upper part of the lower die is used to place the blank; the left module and the right module are symmetrically matched and arranged on the top surface of the lower die base; the upper die base is matched and opened with an upper mold cavity from the center of the bottom; the left and right inner cavity walls of the upper mold cavity are respectively connected to the outer side surfaces of the left module and the right module in an inclined sliding fit; the upper end of the lifting ring is matched and hung on the upper die base, and the upper part of the left module and the right module at the lower end is rigidly connected; the upper die is matched and fixedly installed on the inner cavity bottom of the upper mold cavity and corresponds to the lower die. This patented technology mainly involves the forming die and does not involve the die forging heart rail structure.

[0006] Patent document ZL202211093056.7 relates to a heart rail blank roll forging process, which includes three steps: roll forging, segmented die forging, and trimming. The roll forging process involves heating a steel section heated to a predetermined temperature and rolling it through 1-4 roll forging dies to pre-distribute the metal and obtain a preform. The segmented die forging process involves forging the preform on an open segmented die, first forging the left section and then the right section, with both the forged left and right sections being greater than half the length of the preform, thereby obtaining the heart rail. The trimming process involves removing the flash from the forged heart rail on the die. The present invention heats the steel section once, and through a composite process of roll forging and segmented die forging, a highly precise, one-piece heart rail forging can be quickly obtained. The use of segmented die forging significantly reduces the tonnage requirements of the die forging equipment. The formed heart rail is identical to the finished product, with only a small amount of machining allowance left in terms of size, significantly improving material utilization. This patented technology mainly involves the roller forging process and does not involve the die forging heart rail structure.

[0007] In order to improve material utilization, increase production efficiency and ensure precision, a fixed frog die forging heart rail structure is designed and the following improved technical scheme is proposed. Utility Model Content

[0008] The utility model solves the technical problem of providing a fixed frog die forging heart rail structure, solving the technical problems of low material utilization and low production efficiency of the fixed frog die forging heart rail in the prior art and how to improve the precision.

[0009] The technical solution adopted by the utility model is as follows: a fixed frog die-forged heart rail structure, which is integrally die-forged by a wedge-shaped heart rail and a dovetail-type spacer iron; the upper part of the toe end of the wedge-shaped heart rail is provided with a toe end step; the lower part of the heel end of the dovetail-type spacer iron is provided with a heel end step; the upper part of the heel end of the dovetail-type spacer iron is provided with a heel end positioning surface; a processing allowance of 2 to 10 mm is reserved between the contour of the die-forged heart rail and the contour of the finished heart rail.

[0010] In the above technical solution, for the profile of the die forging heart rail and the profile of the finished heart rail, the head area of ​​the wedge-shaped heart rail gradually increases from top to bottom, and the waist area and the limb area of ​​the wedge-shaped heart rail are equal in width.

[0011] In the above technical solution: for the core rail profile of the die forging: the rail head area of ​​the dovetail spacer iron is of equal width at the top and bottom, but is smaller than the rail waist area and rail limb area width of the dovetail spacer iron, and the rail waist area and rail limb area width of the dovetail spacer iron are equal.

[0012] In the above technical solution: the width of the wedge-shaped heart rail gradually increases from the toe end to the heel end, forming a wedge-shaped structure.

[0013] In the above technical solution, the dovetail spacer iron first changes from large to small and then changes from small to large from the heel end to the toe end, forming a dovetail structure.

[0014] In the above technical solution: there is an arc transition between the wedge-shaped center rail and the dovetail-type spacer iron.

[0015] Among the above technical solutions, as the preferred technical solution of the present invention: the fixed frog die forging heart rail structure is made of one of bainite alloy steel, forged high manganese steel or NM400 material.

[0016] In the above technical solution: the toe step has a depth of 50mm to 60mm, a length of 155mm to 200mm, and a transition length of 90mm to 120mm.

[0017] In the above technical solution: the heel end step has a depth of 14mm to 17mm and a length of 220mm to 330mm.

[0018] In the above technical solution: the heel end positioning surface has a depth of 10 mm to 14 mm and a width of 20 mm to 40 mm.

[0019] The advantages of this utility model compared with the prior art are:

[0020] 1. The utility model has a simple structure and is integrally forged, which has high production efficiency and reduces manufacturing costs.

[0021] 2. The utility model provides a toe step on the upper part of the toe end of the wedge-shaped heart rail, and a heel step on the lower part of the heel end of the dovetail spacer iron to ensure the longitudinal relative position between the heart rail and the spacer iron; the upper part of the heel end of the dovetail spacer iron is provided with a heel end positioning surface to ensure the symmetry of the heart rail and the spacer iron about the center line, thereby ensuring the high precision of the die-forged heart rail.

[0022] 3. A 2-10mm machining margin is reserved between the heart rail profile of the die forging and the heart rail profile of the finished product, which greatly improves material utilization and production efficiency.

[0023] 4. The rail head area of ​​the wedge-shaped heart rail of the utility model gradually increases from top to bottom, and the width of the rail waist area and the rail limb area of ​​the wedge-shaped heart rail is equal, which effectively improves the overall strength of the wedge-shaped heart rail; the rail head area of ​​the dovetail spacer iron is equal in width from top to bottom, but is smaller than the width of the rail waist area and the rail limb area of ​​the dovetail spacer iron, and the width of the rail waist area and the rail limb area of ​​the dovetail spacer iron is equal, which effectively improves the overall strength of the dovetail spacer iron, thereby improving product safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0025] Figure 2 For this utility model Figure 1 Top view;

[0026] Figure 3 For this utility model Figure 1 AA section view;

[0027] Figure 4 For this utility model Figure 1 BB cross-section view;

[0028] Figure 5 For this utility model Figure 1 CC cross-sectional view;

[0029] Figure 6 For this utility model Figure 1 DD cross-sectional view;

[0030] Figure 7 For this utility model Figure 1 EE cross-sectional view;

[0031] Figure 8 For this utility model Figure 1 FF cross-sectional view;

[0032] In the figure: 1- wedge-shaped heart rail, 2- dovetail spacer iron, 3- die forging heart rail profile, 4- finished product heart rail profile, 5- heel end positioning surface, 6- toe end step, 7- heel end step, 8- rail head area, 9- rail waist area, 10- rail limb area. DETAILED DESCRIPTION

[0033] The following is a combination of the appended examples of the present invention Figure 1-8 The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0034] A fixed frog die forging heart rail structure, comprising ( Figure 1 、 Figure 2 (As shown, the wedge-shaped center rail 1 and dovetail-shaped spacer 2 are integrally die-forged.) This utility model has a simple structure and is integrally die-forged, resulting in high production efficiency and reduced manufacturing costs. Furthermore, the technical advantages of the integral die-forged center rail for fixed frogs are primarily reflected in their improved integrity and stability, long service life, ease of maintenance, and improved operational smoothness.

[0035] The wedge-shaped center rail 1 is provided with a toe step 6 at the upper toe end, and the dovetail spacer 2 is provided with a heel step 7 at the lower heel end. The arrangement of the toe step 6 and heel step 7 ensures the longitudinal relative positioning between the wedge-shaped center rail 1 and the dovetail spacer 2. The dovetail spacer 2 is provided with a heel positioning surface 5 at the upper heel end, ensuring the symmetry of the wedge-shaped center rail 1 and the dovetail spacer 2 about the centerline, thereby ensuring the high precision requirements of the die-forged center rail.

[0036] Specifically: the design of the toe-end step 6 and the heel-end step 7 increases the contact area between the heart rail and the spacer iron, thereby improving the connection strength between them. This design enables the heart rail and the spacer iron to work together better when subjected to external loads, and jointly resist deformation and damage. The provision of the heel-end positioning surface 5 helps to ensure the precise positioning of the spacer iron during installation. By cooperating with the heart rail or other components, the positioning surface can ensure that the spacer iron is in the correct position, thereby ensuring the overall geometric dimensions and performance requirements of the frog. Under heavy-load transportation conditions, the frog area needs to withstand greater impact and load. The design of the steps and positioning surfaces makes the connection between the heart rail and the spacer iron more firm and stable, and can better adapt to such working conditions. On curved routes, the contact relationship between the wheel and the heart rail and the spacer iron is more complicated. By optimizing the design of the steps and positioning surfaces, the frog can maintain good performance and stability on curved routes.

[0037] A 2-10mm machining allowance is reserved between the die forging's center rail profile 3 and the finished product's center rail profile 5, significantly improving material utilization and production efficiency. Specifically, during the die forging process, the actual die forging's dimensions and shape may deviate from the designed dimensions due to factors such as die elastic deformation, material springback, and the forging process. The reserved machining allowance allows these deviations to be corrected during subsequent processing, ensuring that the final product's dimensional accuracy and shape meet the required specifications. By reserving a 2-10mm machining allowance, the quality and performance of the final product can be ensured without increasing material costs. This helps reduce scrap caused by insufficient material or machining errors and improves material utilization. The metal flow lines of the die forging are formed during the forging process. A reasonable distribution of these metal flow lines helps improve the mechanical properties and fatigue resistance of the part. Reserving a 2-10mm machining allowance allows for fine machining of the center rail profile without disrupting the metal flow lines, further optimizing their distribution. In complex working conditions such as railways, the heart rail needs to withstand greater impact and wear. Reserving a processing allowance of 2 to 10 mm allows the heart rail profile to be customized according to specific working conditions to meet different usage requirements.

[0038] (like Figure 5(As shown) For the die forging heart rail profile 3 and the finished product heart rail profile 5: the rail head area 8 of the wedge-shaped heart rail 1 gradually increases from top to bottom, and the rail waist area 9 and rail limb area 10 of the wedge-shaped heart rail 1 are equal in width; the overall strength of the wedge-shaped heart rail 1 is effectively improved, thereby improving product safety. Specifically: the design of the rail head area 8 of the wedge-shaped heart rail 1 allows the wheels to gradually transition when passing through the switch, reducing the impact and vibration caused by the sudden change of the rail head; it helps to improve the running smoothness of the train and reduce noise and wear. As the rail head area 8 gradually increases, the contact area between the wheel and the heart rail also increases accordingly, thereby dispersing the contact stress and reducing local wear. At the same time, the optimized wheel-rail contact relationship also helps to improve the traction and braking force of the train. The design of the wedge-shaped heart rail 1 enables the material of the rail head area 8 to distribute stress more reasonably, avoiding the occurrence of stress concentration, which helps to improve the bearing capacity and fatigue resistance of the heart rail and extend its service life. The design of the rail waist area 9 and the rail limb area 10 having equal widths makes the overall structure of the heart rail more balanced and stable, helps to resist external loads and impacts, and ensures the stability and safety of the switch. This design of the wedge-shaped heart rail 1 is relatively simple and easy to process and manufacture. During the processing, the size and shape accuracy can be more easily controlled to improve product quality. Under heavy-load transportation conditions, the switch needs to withstand greater impacts and loads. This design of the wedge-shaped heart rail 1 enables it to better adapt to such working conditions and ensure the safe passage of the train. On lines with smaller curve radii, the contact relationship between the wheels and the heart rail is more complicated. This design of the wedge-shaped heart rail 1 can adapt to different curve radii by adjusting the shape and size of the rail head area, ensuring the smooth operation of the train.

[0039] Similarly: (e.g. Figure 7(As shown) For the die forging heart rail profile 3: the rail head area 8 of the dovetail spacer iron 2 is of equal width from top to bottom, but is smaller than the width of the rail waist area 9 and the rail limb area 10 of the dovetail spacer iron 2, and the rail waist area 9 and the rail limb area 10 of the dovetail spacer iron 2 are equal in width, which effectively improves the overall strength of the dovetail spacer iron 2, thereby improving product safety. Specifically: the rail head area 8 of the dovetail spacer iron 2 is of equal width from top to bottom and is smaller than the width of the rail waist area 9 and the rail limb area 10. This design makes the structure more uniform in the vertical direction and enhances the overall stability. At the same time, the wider design of the rail waist area 9 and the rail limb area 10 improves the bearing capacity of the spacer iron, enabling it to withstand greater loads and impacts. Since the width of the rail waist area 9 and the rail limb area 10 are equal and larger than the rail head area 8, this design enables the spacer iron to better disperse stress when subjected to external forces, reducing the risk of deformation and damage. The standardized design of the dovetail spacers 2 makes them compatible with different track types and equipment, simplifying installation and maintenance. This standardized design also helps improve production efficiency and reduce costs. When the spacers need to be replaced, their relatively simple structure and standardized design make them easier to remove and replace, minimizing downtime and traffic disruptions. The dovetail spacers 2 optimize the wheel-rail relationship, reducing friction and wear between the wheels and rails. This not only extends the service life of the wheels and rails, but also reduces operating noise and vibration. By optimizing the wheel-rail relationship, the dovetail spacers 2 also help improve train running smoothness, reduce shock and vibration caused by wheel-rail irregularities, and enhance passenger comfort. The dovetail spacers 2 are designed to adapt to diverse operating conditions and environments, maintaining excellent stability and load-bearing capacity for both heavy-load transport and high-speed operation. In some cases, the spacers may need to be adjusted to meet specific operating requirements, but the dovetail spacer design makes adjustment relatively simple and easy.

[0040] In the above embodiment, (such as Figure 2 The wedge-shaped rail 1 (shown in FIG) gradually widens from the toe end to the heel end, forming a wedge-shaped structure. As the rail width increases, the contact area between the wheel and the rail also increases, thereby dispersing contact stress and avoiding localized stress concentration. This helps extend the service life of the rail and improve the overall stability of the frog.

[0041] In the above embodiment, (such as Figure 2The dovetail-shaped spacer 2 (shown in Figure 2) gradually narrows from the heel end to the toe end, then gradually widens, forming a dovetail-like structure. The varying width of the dovetail-shaped spacer 2 allows for a smoother transition when the wheels pass through the frog, reducing impact and vibration between the wheel and rail, thereby improving train running stability and ride comfort. This smooth transition also helps reduce friction and wear between the wheels and spacers, extending the service life of both wheels and spacers.

[0042] In the above embodiment, there is an arc transition between the wedge-shaped heart rail 1 and the dovetail-type spacer 2. The arc transition design enables the wheel to achieve a smoother transition when passing through the connection between the heart rail and the spacer. This design reduces the impact and vibration caused by sudden changes, and helps to improve the running smoothness and ride comfort of the train. The smooth arc transition also helps to reduce the friction and wear between the wheel and the heart rail and the spacer, extending the service life of these components and reducing maintenance costs. The arc transition design can disperse stress to a certain extent and avoid stress concentration at the connection; this helps to enhance the stability and load-bearing capacity of the overall structure and ensure that the frog area can remain stable when subjected to heavy loads and impacts. Because the arc transition design makes the connection smoother, it reduces the risk of deformation caused by structural mutations, helps to improve the deformation resistance of the frog area, and ensures the safe passage of the train. The arc transition design makes the connection between the heart rail and the spacer smoother, reduces the difficulty and complexity of the installation process, helps to shorten the installation time, and improves the installation efficiency. Under heavy-load transport conditions, the frog area must withstand greater impact and load. The arc transition design provides a stronger and more stable connection between the rail and the spacer, better adapting to these conditions. On curved lines, the contact relationship between the wheel, rail, and spacer is more complex. The arc transition design can adjust the radius and shape of the arc to accommodate different curve radii and superelevation requirements, ensuring smooth train operation.

[0043] In the above embodiment, as a preferred embodiment of the present invention, the fixed frog die forging center rail structure is made of bainite alloy steel, forged high manganese steel or NM400 material.

[0044] When it is made of bainitic alloy steel: Bainitic alloy steel has good comprehensive mechanical properties of high strength and high toughness, can withstand large loads and impacts, and ensure the stability and safety of the switch; its tensile strength and yield strength are both high, which can meet the needs of heavy-load transportation. Bainitic rails can effectively reduce rail wear and extend the service life of the switch due to their excellent wear resistance. Under heavy-load transportation conditions, their wear resistance is particularly important and can significantly reduce maintenance costs. Bainitic alloy steel has excellent fatigue damage resistance and can slow down or prevent the occurrence of contact fatigue damage (such as wave wear, peeling cracks, etc.). Bainitic alloy steel has good weldability, which is convenient for connection and maintenance with other components.

[0045] Forged high-manganese steel possesses exceptional hardness and strength, capable of withstanding greater impacts and loads, ensuring frog stability in harsh operating conditions. Forged high-manganese steel frogs exhibit a very low wear rate, are resistant to wear, and maintain stable performance over time. Their wear resistance surpasses that of ordinary steel, making them suitable for high-wear environments. Forged high-manganese steel also possesses excellent impact resistance, maintaining structural integrity and stability even under impact. They also maintain excellent stability at high temperatures and are less susceptible to softening, making them suitable for high-temperature operating environments.

[0046] NM400 material offers high strength and wear resistance, capable of withstanding heavy loads and impacts while reducing wear. Its specially treated surface provides high hardness and excellent wear resistance. NM400 also offers excellent corrosion resistance and maintains stable performance in harsh environments, extending frog service life and reducing maintenance costs. NM400 is easy to cut, weld, and process, facilitating customization and installation based on specific needs.

[0047] In the above embodiment, the toe step has a depth of 50 mm to 60 mm, a length of 155 mm to 200 mm, and a transition length of 90 mm to 120 mm.

[0048] The heel end step has a depth of 14 mm to 17 mm and a length of 220 mm to 330 mm.

[0049] The heel end positioning surface has a depth of 10 mm to 14 mm and a width of 20 mm to 40 mm.

[0050] Specifically:

[0051] Example 1: When the toe step 6 is 50 mm deep and 191 mm long, the heel step 7 is 16 mm deep and 325 mm long; the heel positioning surface 5 is 14 mm deep and 32 mm wide, it is suitable for 60 kg / m rail No. 12 turnouts.

[0052] Example 2: When the toe step 6 is 50 mm deep and 150 mm long, the heel step 7 is 16 mm deep and 225 mm long; the heel positioning surface 5 is 14 mm deep and 23 mm wide, it is suitable for turnouts with 60 kg / m rail No. 9.

[0053] Example 3: When the toe step 6 is 50 mm deep and 194 mm long, the heel step 7 is 17 mm deep and 325 mm long; the heel positioning surface 5 is 14 mm deep and 31 mm wide, it is suitable for 75 kg / m rail No. 12 turnouts.

[0054] From the above description, it can be found that the present invention has a simple structure, is integrally die-forged, has high production efficiency, and reduces manufacturing costs. The present invention ensures the high precision requirements of the die-forged heart rail by setting the toe-end step 6, the heel-end step 7, and the heel-end positioning surface 5. The present invention has a very small reserved processing amount of 2 to 10 mm, which improves the utilization rate of raw materials and processing efficiency. The waist area 9 of the wedge-shaped heart rail 1 of the present invention is flush with the rail limb area 10 in the vertical direction, which ensures the overall strength of the heart rail and the safety of on-track use.

[0055] In summary, the utility model has a simple structure, high production efficiency, low manufacturing cost, high precision, high material utilization and production efficiency, reliable overall strength, and effectively improves product safety.

[0056] It should be understood that although this specification is described according to one embodiment, this embodiment does not only include one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in this embodiment can also be appropriately arranged and combined to form other embodiments that can be understood by those skilled in the art.

[0057] The above preferred embodiments are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes made to the contents described in the claims of the present invention should be included in the scope of the claims of the present invention. It should be noted that the components and materials used in the above embodiments are commercially available unless otherwise specified.

Claims

1. A fixed frog die forging rail structure, characterized by: The invention is formed by integral die forging of a wedge-shaped heart rail (1) and a dovetail-type spacer iron (2); a toe-end step (6) is provided on the upper toe end of the wedge-shaped heart rail (1); a heel-end step (7) is provided on the lower heel end of the dovetail-type spacer iron (2); a heel-end positioning surface (5) is provided on the upper heel end of the dovetail-type spacer iron (2); and a machining allowance of 2 to 10 mm is reserved between the heart rail profile (3) of the die forging and the heart rail profile (4) of the finished product.

2. The fixed frog die forging rail structure according to claim 1, characterized in that: With respect to the die forging heart rail profile (3) and the finished product heart rail profile (4): the rail head area (8) of the wedge-shaped heart rail (1) gradually increases from top to bottom, and the rail waist area (9) and rail limb area (10) of the wedge-shaped heart rail (1) have the same width.

3. The fixed frog die forging rail structure according to claim 1, characterized in that: For the die forging heart rail profile (3): the rail head region (8) of the dovetail spacer iron (2) has the same width at the top and bottom, but is smaller than the width of the rail waist region (9) and the rail limb region (10) of the dovetail spacer iron (2), and the width of the rail waist region (9) and the rail limb region (10) of the dovetail spacer iron (2) is equal.

4. The fixed frog die forging rail structure according to claim 1, characterized in that: The width of the wedge-shaped center rail (1) gradually increases from the toe end to the heel end, forming a wedge-shaped structure.

5. The fixed frog die forging rail structure according to claim 1, characterized in that: The dovetail type spacer iron (2) first changes from large to small and then changes from small to large from the heel end to the toe end, forming a dovetail type structure.

6. The fixed frog die forging rail structure according to claim 1, characterized in that: There is an arc transition between the wedge-shaped center rail (1) and the dovetail-type spacer iron (2).

7. The fixed frog die forging rail structure according to claim 1, characterized in that: The fixed frog die forging heart rail structure is made of one of bainite alloy steel material, forged high manganese steel material or NM400 material.

8. The fixed frog die forging rail structure according to claim 1, characterized in that: The toe end step (6) has a depth of 50 mm to 60 mm, a length of 155 mm to 200 mm, and a transition length of 90 mm to 120 mm.

9. The fixed frog die forging rail structure according to claim 1, characterized in that: The heel end step (7) has a depth of 14 mm to 17 mm and a length of 220 mm to 330 mm.

10. The fixed frog die forging rail structure according to claim 1, characterized in that: The heel end positioning surface (5) has a depth of 10 mm to 14 mm and a width of 20 mm to 40 mm.

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