Manufacturing process of high-strength and high-toughness frog

Abstract

The invention relates to the technical field of railway track accessories, and discloses a manufacturing process of a high-strength and high-toughness frog, which comprises the following specific steps of: 1, preparing materials, namely selecting high-strength alloy steel or rare earth alloy steel which comprises the following components: 0.75 percent of carbon, 1.0 percent of chromium, 1.2 percent of nickel, 0.2 percent of molybdenum and 0.02 percent of rare earth element, and smelting in an electric furnace to ensure that the chemical components are accurate; secondly, casting and primary machining are conducted, specifically, a precision casting technology is used, molten metal is injected into a mold and cooled to form the rough shape of the frog, primary machining is conducted, casting excess materials are removed, the frog is adjusted to the target size, and the tolerance is + / -1 mm; the vertical movement of the frame body and the workpiece promotes the circulating flow of the cooling medium inside and outside the frame body, so that the uniformity of the cooling medium is ensured. By means of the design, the problem of uneven cooling caused by local temperature rise of the cooling medium is effectively avoided, and the overall cooling effect of the workpiece is improved.

Description

Technical Field

[0001] The invention relates to the technical field of railway track accessories, and in particular to a manufacturing process of a high-strength and toughness frog. Background Art

[0002] Rare earth alloy steel frogs are widely used in railway track transportation systems. As one of the key components of railway tracks, their performance directly affects the safety and efficiency of train operation. As the intersection of the track, the frog bears the strong pressure and impact when the train passes, and must have high strength, good wear resistance and toughness. In order to meet these requirements, traditional high-alloy steel materials are gradually replaced by rare earth alloy steels because of their superior performance. Rare earth alloy steels are made by adding rare earth elements (such as cerium, lanthanum, etc.) to high-alloy steel. These rare earth elements can significantly improve the microstructure of steel, refine grains, reduce inclusion content, and thus improve the mechanical properties of steel.

[0003] In frog manufacturing, quenching is a key process to achieve high strength. By heating the metal to a high temperature and cooling it rapidly, quenching significantly increases the hardness of the material, laying the foundation for achieving high strength and toughness. Although quenching significantly improves hardness and strength, it usually increases the brittleness of the material and reduces toughness. Therefore, in order to ensure the strength of the material while improving toughness, the high-hardness material after quenching provides a basis for further heat treatment (such as tempering). Although quenching may lead to a decrease in toughness, the hardness and strength it brings are necessary prerequisites for achieving high strength and toughness.

[0004] During the quenching process of the frog, the cooling medium is used to quickly cool the frog workpiece. However, due to the large volume of the frog workpiece, the local temperature of the cooling medium may rise rapidly during the cooling process due to the large amount of heat released by the frog workpiece during cooling. This temperature increase will cause the cooling capacity of the cooling medium to decrease, forming an uneven distribution of the cooling medium temperature. The cooling medium with uneven temperature may cause the frog workpiece to cool at different speeds in different areas, thereby generating temperature gradients and internal stresses. In order to maintain the uniformity of the cooling medium, it is usually necessary to circulate or stir it. However, the frog has a complex shape, including crossed rails and supporting parts, with an uneven surface and containing multiple angles and gaps. These irregular shapes easily lead to bubble capture and accumulation, and stirring the cooling medium alone cannot effectively eliminate the bubbles. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a manufacturing process for a high-strength and toughness frog, aiming to alleviate the above-mentioned problems at least to a certain extent.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] A manufacturing process of a high-strength and toughness frog, the specific steps of the process are:

[0008] Step 1: Material preparation, select high-strength alloy steel or rare earth alloy steel, composition: carbon 0.75%, chromium 1.0%, nickel 1.2%, molybdenum 0.2%, rare earth element 0.02%, smelt in an electric furnace to ensure accurate chemical composition;

[0009] Step 2: Casting and preliminary processing: using precision casting technology, the molten metal is injected into the mold, and after cooling, the rough shape of the frog is formed, and preliminary processing is performed to remove the casting residue and adjust it to the target size with a tolerance of ±1mm;

[0010] Step 3: preheating and quenching, preheating to 600°C, keeping warm for 30 minutes, heating to 900°C, keeping warm for 60 minutes, and then immersing in a 50°C polymer solution through a quenching device for cooling;

[0011] Step 4: Tempering treatment, heating to 500℃, keeping warm for 60 minutes, heating with a resistance furnace or a gas furnace, and slowly cooling in air at a cooling rate of 5℃ / min until room temperature;

[0012] Step 5: Finishing and inspection, turning, milling and grinding, ensuring the dimensional tolerance of ±0.5mm, surface roughness Ra 1.6μm, hardness test (HRC 50-55), toughness test (≥50J / cm 2 ) and non-destructive testing (ultrasonic) to ensure there are no cracks;

[0013] Among them, the quenching equipment described in step three includes a workbench, the workbench is provided with a box body, the box body is filled with a polymer solution for cooling the workpiece, the top of the box body is provided with a top plate, a frame body for storing the workpiece is provided between the top plate and the box body, the frame body is located at the top of the box body, and the top of the frame body is provided with a top cover for closing the frame body, the top cover and the frame body have a plurality of holes for medium flow, two push plates are provided between the top cover and the top plate, the push plates can slide on the top plate, a moving component for moving the top plate is provided between the workbench and the top plate, the top plate can buckle the top cover on the frame body when the top plate is moved downward to a preset position, and the top plate can buckle the box body, a vibrating component for moving the frame body up and down is provided between the box body and the frame, when the frame body moves upward in the box body, the two push plates can move away from each other, and when the frame body is reset downward after moving upward, the two push plates can move close to each other.

[0014] Preferably, the bottom of the top plate is connected to a first rod, the bottom of the first rod is slidably connected to a second rod, the top of the top cover is connected to a first connecting rod connected to the first rod, and the bottom of the frame is connected to a second connecting rod connected to the second rod.

[0015] Preferably, a first spring is connected between the first rod and the second rod.

[0016] Preferably, the push plate includes a first plate slidably connected to the top plate, a second plate is slidably connected to the bottom of the first plate, and a second spring is connected between the first plate and the second plate.

[0017] Preferably, a fixed shaft is connected to the bottom of the top plate, both ends of the fixed shaft are respectively connected to telescopic shafts connected to the first plate, and a third spring is connected between the telescopic shaft and the fixed shaft.

[0018] Preferably, a sliding groove is provided on the first rod, the first connecting rod is slidably connected in the sliding groove, a fourth spring is connected between the first connecting rod and the sliding groove, a connecting port is provided on the first connecting rod, a traction rope is connected to the bottom of the first connecting rod, and one end of the traction rope passes through the connecting port and is connected to the first plate.

[0019] Preferably, the vibration component comprises a bracket connected to the second connecting rod, the bracket is connected to a boss, a rotating shaft is rotatably connected in the box, and a cam is connected to the rotating shaft.

[0020] Preferably, the moving component includes a screw rod rotatably connected to the work frame, a third connecting rod threadably connected to the screw rod is connected to the top plate, a first gear is connected to the screw rod, a second gear meshing with the screw rod is connected to the rotating shaft, a plurality of connecting grooves are provided on the inner side wall of the first gear, a top rod is slidably connected in the connecting groove, a fifth spring is connected between the top rod and the connecting groove, a plurality of top grooves matching the top rod are provided on the screw rod, the top grooves are semi-spherical grooves, a motor is connected to the bottom of the box, and a chain transmission mechanism is connected between the drive shaft of the motor and the rotating shaft.

[0021] In summary, the present invention mainly has the following beneficial effects:

[0022] 1. Uniform cooling:

[0023] The design of the frame, top cover and vibrating components ensures that the cooling medium can evenly contact every part of the workpiece surface. The up and down movement of the frame and the workpiece promotes the circulation of the cooling medium inside and outside the frame, thereby ensuring the uniformity of the cooling medium. This design effectively avoids the problem of uneven cooling caused by the local temperature increase of the cooling medium and improves the overall cooling effect of the workpiece.

[0024] 2. Bubble removal:

[0025] The up and down movement of the frame and the turbulent effect of the cooling medium can disturb the bubbles attached to the surface of the workpiece, so that they are no longer fixed in the concave and convex parts or gaps of the workpiece, and are thus carried away by the cooling medium. This mechanism effectively prevents the bubbles from forming an insulation layer on the surface of the workpiece, ensures uniform cooling of the workpiece, reduces the internal stress concentration caused by uneven local cooling, and ultimately improves the cooling effect and surface quality of the workpiece.

[0026] 3. Prevent medium from splashing:

[0027] The closed design, which snaps the top plate onto the top of the box, effectively prevents the cooling medium from splashing out of the box during vibration. This not only reduces the waste of cooling medium, but also avoids pollution of the operating environment and potential safety hazards. In addition, the closed environment helps to maintain the uniformity of the cooling medium, further improving the cooling quality and surface finish of the workpiece.

[0028] 4. Optimize cooling efficiency:

[0029] By setting the linkage between the frame and the push plate, the cooling medium can form a continuous flow on the surface of the workpiece. This fluidity enhances the coverage effect of the cooling medium, reduces the formation or adhesion of bubbles, and avoids local poor cooling caused by bubbles. The up and down movement and vibration of the frame ensures good circulation of the cooling medium inside and outside the frame, thereby further optimizing the cooling efficiency and reducing possible defects on the workpiece surface, such as cracks or excessive surface roughness.

[0030] 5. Keep cooling conditions stable:

[0031] The closed box design effectively avoids the temperature fluctuation of the cooling medium caused by the external environment, ensuring the stability and uniformity of the cooling process. In this way, the best cooling conditions can be maintained throughout the cooling process, meeting the strict performance requirements of high-strength alloy steel or rare earth alloy steel frog workpieces.

[0032] Through the above designs and measures, technical problems such as uneven temperature, bubble formation, medium sputtering and poor medium flow that may occur during the cooling process are solved, ensuring the cooling effect and final quality of the frog workpiece during the quenching process.

[0033] 6. In the present application, in the manufacturing process of high-strength and toughness frogs, the precise ratio of alloy components has a crucial influence on toughness. The carbon content is controlled at 0.75%, which can not only improve the hardness of the material, but also avoid excessive increase in brittleness, ensuring a moderate balance between strength and toughness. The addition of chromium (1.0%) not only improves the wear resistance of the material, but also enhances the fatigue resistance, making the frog more durable and stable under high-intensity applications. The nickel content is 1.2%, which significantly enhances the toughness and impact resistance of the material, ensuring the reliability of the frog under high-impact and high-load conditions. The 0.2% content of molybdenum improves the high-temperature stability and wear resistance of the material. Although the direct effect on toughness is small, it plays an important role in enhancing overall performance and durability. The trace addition of rare earth elements (0.02%) effectively refines the grains, improves the microstructure of the material, reduces the formation of cracks and defects, and thus improves the overall toughness and stability of the material. Through the precise proportion of these components, the frog not only has sufficient strength to cope with the huge pressure in railway operation, but also maintains excellent toughness and can provide long-lasting and reliable performance in harsh application environments. This combined effect ensures that the frog has both wear resistance and effective resistance to brittle failure under high load and high impact conditions, thereby extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the manufacturing process of the present invention;

[0035] Figure 2 It is a schematic diagram of the structure of the quenching equipment of the present invention;

[0036] Figure 3 It is a schematic diagram of the box structure of the present invention;

[0037] Figure 4 yes Figure 3 A schematic diagram of the enlarged local structure at point A in the middle;

[0038] Figure 5 It is a schematic diagram of the top plate structure of the present invention;

[0039] Figure 6 is a schematic diagram of the top cover and the frame structure of the present invention after being buckled together;

[0040] Figure 7 is a schematic diagram of the first rod structure of the present invention;

[0041] Figure 8 It is a schematic diagram of the push plate structure of the present invention;

[0042] Fig. 9 It is a schematic diagram of the cam and boss structure of the present invention.

[0043] Reference numerals:

[0044] 100, quenching equipment; 101, work frame; 102, box body; 103, top plate; 104, frame body; 105, top cover; 106, push plate;

[0045] 200, first rod; 201, second rod; 202, first connecting rod; 203, second connecting rod; 204, first spring; 205, first plate; 206, second plate; 207, second spring;

[0046] 300, fixed axis; 301, telescopic axis; 302, third spring; 303, slide groove; 304, fourth spring; 305, connection port; 306, traction rope;

[0047] 400, bracket; 401, boss; 402, rotating shaft; 403, cam;

[0048] 500, screw rod; 501, third connecting rod; 502, first gear; 503, second gear; 504, connecting groove; 505, push rod; 506, fifth spring; 507, top groove; 508, motor; 509, chain transmission mechanism. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0050] refer to Figure 1-Figure 9 , a manufacturing process of a high-strength and toughness frog, the specific steps of the process are:

[0051] Step 1: Material preparation, select high-strength alloy steel or rare earth alloy steel, composition: carbon 0.75%, chromium 1.0%, nickel 1.2%, molybdenum 0.2%, rare earth element 0.02%, smelt in an electric furnace to ensure accurate chemical composition;

[0052] Step 2: Casting and preliminary processing: using precision casting technology, the molten metal is injected into the mold, and after cooling, the rough shape of the frog is formed, and preliminary processing is performed to remove the casting residue and adjust it to the target size with a tolerance of ±1mm;

[0053] Step 3: preheating and quenching, preheating to 600°C, keeping warm for 30 minutes, heating to 900°C, keeping warm for 60 minutes, and then immersing in a 50°C polymer solution through a quenching device 100 for cooling;

[0054] Step 4: Tempering treatment, heating to 500℃, keeping warm for 60 minutes, heating with a resistance furnace or a gas furnace, and slowly cooling in air at a cooling rate of 5℃ / min until room temperature;

[0055] Step 5: Finishing and inspection, turning, milling and grinding, ensuring the dimensional tolerance of ±0.5mm, surface roughness Ra 1.6μm, hardness test (HRC 50-55), toughness test (≥50J / cm 2 ) and non-destructive testing (ultrasonic) to ensure there are no cracks;

[0056] The quenching equipment 100 in step 3 includes a work frame 101, a box 102 is provided on the work frame 101, the box 102 is filled with a polymer solution for cooling the workpiece, a top plate 103 is provided on the top of the box 102, a frame 104 for storing the workpiece is provided between the top plate 103 and the box 102, the frame 104 is located on the top of the box 102, a top cover 105 for closing the frame 104 is provided on the top of the frame 104, the top cover 105 and the frame 104 have a plurality of holes for medium flow, two push plates 106 are provided between the top cover 105 and the top plate 103, and the push plates 106 It can slide on the top plate 103. A moving component for moving the top plate 103 is provided between the work frame 101 and the top plate 103. When the top plate 103 is moved downward to a preset position, the top cover 105 can be buckled on the frame 104. The top plate 103 can buckle the box 102. A vibration component for moving the frame 104 up and down is provided between the box 102 and the frame 104. When the frame 104 moves upward in the box 102, the two push plates 106 can move away from each other. When the frame 104 moves downward after moving upward, the two push plates 106 can move toward each other.

[0057] By setting the frame 104, in the initial state, the frame 104 is located at the top of the box body 102, and there is a certain distance between the top cover 105 and the frame 104, so that the staff can place the preheated frog workpiece in the frame 104. When in use, after the frog workpiece is placed in the frame 104, the moving part can be started, and the moving part will first move the position of the top plate 103 downward. When the top plate 103 moves downward to the preset position, the top cover 105 at the bottom of the top plate 103 can be buckled in the frame 104, and the top of the frame 104 is closed. At the same time, the squeezing force of the top cover 105 on the top cover 105 can be used to squeeze and position the frog workpiece in the frame 104. At this time, the squeezing force of the top cover 105 also firmly positions the frog workpiece in the frame 104 to prevent the workpiece from shifting during the cooling process. When the top cover 105 is buckled on the top of the frame 104, the top plate 103 can be buckled on the top of the box body 102 to close the box body 102. At this time, the frame body 104 and the top cover 105 are in the box body 102. The cooling medium in the box body 102 can enter the frame body 104 through the holes on the frame body 104 and the top cover 105, and the workpiece can be completely immersed in the cooling medium. The vibration component set can make the frame body 104 move upward in the box body 102, and the frame body 104 can drive the workpiece therein to move together. During the movement, the up and down movement of the frame body 104 and the workpiece can cause the cooling medium to circulate inside and outside the frame body 104, ensuring that the cooling medium evenly contacts every part of the surface of the workpiece. When the frame body 104 moves upward to a preset position, a downward reset movement is opened. Through the up and down movement of the frame body 104, the position of the workpiece in the cooling medium is constantly changing. This intermittent movement will enhance the fluidity of the cooling medium, thereby producing a turbulent effect. Turbulence can disturb the bubbles attached to the surface of the workpiece, so that they are no longer fixed in the concave and convex parts or gaps on the surface of the workpiece, and are thus carried away by the cooling medium. This mechanism effectively prevents the bubbles from forming an insulating layer on the surface of the workpiece, ensures uniform cooling of the workpiece, reduces the internal stress concentration caused by uneven local cooling, and ultimately improves the cooling effect and surface quality of the workpiece. In addition, the top plate 103 is buckled on the top of the box 102 to close the box 102, avoiding the temperature fluctuation of the cooling medium caused by the influence of the external environment, and further ensuring the stability and uniformity of the cooling process. This design effectively prevents the performance degradation of the cooling medium due to volatilization or changes in external temperature, ensuring that the frog workpiece is always under the best cooling conditions during the entire cooling process. After the top plate 103 is buckled on the top of the box 102, it can not only close the box 102 to avoid the temperature fluctuation of the cooling medium, but also effectively prevent the cooling medium from splashing out of the box 102 during vibration. This closed design ensures that the cooling medium always circulates in the box 102, which not only reduces the waste of cooling medium, but also avoids operating environment pollution or potential safety hazards caused by sputtering.At the same time, the sputtered cooling medium may cause uneven temperature and affect the cooling effect of the workpiece, while the closed environment helps to maintain the uniformity of the cooling medium, further improving the cooling quality and surface finish of the workpiece. Furthermore, under the action of the vibrating component, when the frame 104 moves upward in the box body 102, the medium will enter the frame body 104 through the holes on the top cover 105, flow on the surface of the workpiece, and flow out from the bottom of the frame body 104. At this time, the two push plates 106 set can move away from each other, pushing the medium on both sides of the top of the top cover 105, and flowing from the side walls of the frame body 104 to the top of the frame body 104. This design further optimizes the cooling effect of the workpiece surface by enhancing the circulation flow of the cooling medium. Under the push of the push plate 106, the cooling medium can not only cover the workpiece more effectively, but also All surfaces of the workpiece can also enhance the fluidity of the cooling medium. The fluid shear force formed by the cooling medium on the workpiece surface can further reduce the formation or adhesion of bubbles, thereby avoiding local poor cooling caused by bubbles. This design effectively reduces the temperature difference and stress concentration on the workpiece surface, ensuring the uniformity and stability of the cooling process. Similarly, when the frame 104 moves downward to reset, the up and down movement and vibration of the frame 104 make the cooling medium circulate inside and outside the frame 104, avoiding the problem of uneven cooling caused by the local temperature increase of the cooling medium. By setting the linkage setting of the frame 104 and the push plate 106, the cooling medium can form a continuous flow on the workpiece surface, which not only improves the cooling efficiency, but also reduces the defects that may appear on the workpiece surface, such as cracks or excessive surface roughness. This optimized cooling scheme ensures that the workpiece not only obtains the required hardness and strength during the quenching process, but also maintains good toughness and surface quality, meeting the strict performance requirements of high-strength alloy steel or rare earth alloy steel frog workpieces. Through the above measures, technical problems such as uneven temperature, bubble formation, medium sputtering and poor medium flow that may occur during the cooling process are solved, ensuring the cooling effect and final quality of the frog workpiece during the quenching process.

[0058] In addition, in the manufacturing process of high-strength and toughness frogs, not only the precise ratio of alloy components has an important influence on toughness, but every link in the entire process plays a key role in the final high-strength and toughness performance. First, the composition ratio of the material provides the basic strength and toughness for the frog. The carbon content is controlled at 0.75%, which improves the hardness while avoiding excessive brittleness. The addition of chromium, nickel, molybdenum and rare earth elements further enhances the wear resistance, impact resistance, high temperature stability and uniformity of the microstructure. The combination of these components provides a good balance of strength and toughness for the frog when subjected to high loads and impacts. Secondly, the preheating and quenching process is a key step to improve the toughness of the material. Preheating to 600℃ before quenching can reduce the thermal stress caused by the temperature gradient and prevent the material from cracking during the subsequent rapid cooling. The rapid cooling during the quenching process forms a high-hardness martensitic structure, which provides the necessary strength for the frog. However, the quenched material usually exhibits high brittleness, so tempering treatment is essential. The tempering process releases the internal stress accumulated during the quenching process by keeping the temperature at 500°C for 60 minutes, and converts part of the hardness into toughness, thereby reducing the brittleness of the material. This process allows the frog to maintain high hardness while significantly improving the impact resistance and overall toughness, ensuring that the material can withstand repeated impacts and loads in actual use. Finally, the finishing and inspection steps ensure the dimensional accuracy and surface quality of the frog, and further verify the high strength and toughness indicators of the material through hardness testing, toughness testing and non-destructive testing. These processes work together to ensure that the frog can maintain excellent performance and safety for a long time in harsh application environments.

[0059] As a further solution of the present invention, the bottom of the top plate 103 is connected to a first rod 200, the bottom of the first rod 200 is slidably connected to a second rod 201, the top of the top cover 105 is connected to a first connecting rod 202 connected to the first rod 200, and the bottom of the frame 104 is connected to a second connecting rod 203 connected to the second rod 201;

[0060] As a further solution of the present invention, a first spring 204 is connected between the first rod 200 and the second rod 201;

[0061] By setting the first spring 204, the first spring 204 can support and limit the position of the second rod 201, thereby supporting the position of the frame 104, ensuring that the frame 104 is at the top of the box body 102, which is convenient for the staff to take and put the frog workpiece. When the moving component moves the top plate 103 downward, the top plate 103 can move the frame 104 downward through the first rod 200, the second rod 201 and the second connecting rod 203. When the first rod 200 moves downward, it can also pass through the first connecting rod 203 to allow the frame 104 to move downward. The connecting rod 202 allows the top cover 105 to move downward together. When the second rod 201 moves downward to the limit position of the bottom surface of the box body 102, the top cover 105 continues to move downward, the first rod 200 slides on the second rod 201, and the top cover 105 can be buckled on the frame body 104. At the same time, the top plate 103 can be buckled on the box body 102, and the cooling medium can flow into the frame body 104 through the holes on the top cover 105 and the frame body 104, ensuring that the workpiece is completely immersed in the cooling medium. Through this design, the workpiece is not only fully immersed in cooling, but also avoids the problem of cooling medium leakage caused by poor sealing. When the cooling is completed, the moving part starts in the reverse direction, and the top plate 103 starts to move upward. In this process, the top cover 105 will first detach from the frame body 104, and then the frame body 104 moves upward under the drive of the first rod 200, and the first spring 204 gradually rebounds to push the frame body 104 back to the initial position. At this time, the staff can easily take out the cooled frog workpiece from the frame 104. This design realizes the closed circulation of the cooling medium, effectively improves the cooling efficiency, and ensures the stability of the frame 104 during the cooling process through the limiting and supporting function of the first spring 204. Finally, through the coordinated movement between the top plate 103, the top cover 105, the frame 104, and the box 102, the technical problems such as unstable positioning, medium leakage, and uneven cooling effect that may occur during the cooling process of the workpiece are solved, and the cooling quality and processing accuracy of the frog workpiece are further guaranteed.

[0062] As a further solution of the present invention, the push plate 106 includes a first plate 205 slidably connected to the top plate 103, a second plate 206 is slidably connected to the bottom of the first plate 205, and a second spring 207 is connected between the first plate 205 and the second plate 206;

[0063] By setting the second spring 207, the second spring 207 can limit the position of the second plate 206 so that the second plate 206 can contact the top of the top cover 105. When the frame 104 moves upward and then returns to its original position downward, the second plate 206 can slide on the first plate 205, thereby avoiding the problem that the frame 104 cannot move smoothly due to position limitation. At the same time, the second spring 207 is used to allow the second plate 206 to contact the top of the top cover 105, thereby avoiding the problem that the medium cannot be pushed well due to the gap between the second plate 206 and the top cover 105 when the push plate 106 moves, thereby ensuring the effective flow of the cooling medium in the frame 104, and improving the uniformity and stability of the cooling process. Through the coordinated cooperation of the first plate 205, the second plate 206 and the second spring 207, not only the precise control of the flow of the cooling medium is achieved, but also the cooling effect of the workpiece is effectively improved, ensuring the uniformity of the temperature distribution during the cooling process, thereby further improving the processing quality and performance of the frog workpiece.

[0064] As a further solution of the present invention, a fixed shaft 300 is connected to the bottom of the top plate 103, and both ends of the fixed shaft 300 are respectively connected to telescopic shafts 301 connected to the first plate 205, and a third spring 302 is connected between the telescopic shaft 301 and the fixed shaft 300;

[0065] By setting the third spring 302, the third spring 302 can limit the position of the telescopic shaft 301 and the first plate 205, and then limit the position of the second plate 206. When the frame 104 and the top cover 105 move upward, the two first plates 205 can move away from each other, and the telescopic shaft 301 moves with it. The third spring 302 can stretch to generate potential energy. When the frame 104 moves downward, the third spring 302 can release the potential energy, allowing the telescopic shaft 301, the first plate 205 and the second plate 206 to move, and the two push plates 106 can move closer to each other, promoting the circulation of the cooling medium in the frame 104, so that the cooling medium can cover the surface of the workpiece more evenly, avoiding the problem of internal stress concentration caused by uneven local cooling. This elastic adjustment design ensures the precise positioning and stable movement of the push plate 106 during the up and down movement of the frame 104, thereby improving the efficiency and reliability of the entire cooling system.

[0066] As a further solution of the present invention, a slide groove 303 is provided on the first rod 200, the first connecting rod 202 is slidably connected in the slide groove 303, a fourth spring 304 is connected between the first connecting rod 202 and the slide groove 303, a connecting port 305 is provided on the first connecting rod 202, a traction rope 306 is connected to the bottom of the first connecting rod 202, and one end of the traction rope 306 passes through the connecting port 305 and is connected to the first plate 205;

[0067] By setting the fourth spring 304, the elastic coefficient of the fourth spring 304 is greater than that of the first spring 204, so that when the second rod 201 moves downward to the limit position, the first rod 200 can slide on the second rod 201, so that the top cover 105 is buckled on the frame 104. When the vibration component moves the frame 104 upward, the frame 104 moves upward, which can drive the second connecting rod 203, the second rod 201 and the top cover 105 to move upward, and stretch the first spring 204 again. When the top cover 105 moves upward, it can pull the traction rope 306 through the first connecting rod 202. At this time, the fourth spring 304 is stretched to generate potential energy, and the traction rope 306 can pull the position of the first plate 205, thereby To achieve the purpose of moving the first plate 205 and the second plate 206 to push the medium, when the frame 104 moves downward, the first spring 204 and the fourth spring 304 release potential energy, which can allow the frame 104 and the top cover 105 to reset downward, and the traction rope 306 no longer pulls the first plate 205. The first plate 205 is reset by the force of the third spring 302. The design of the traction rope 306 plays a key role in the entire cooling process. Through the pulling of the fourth spring 304, the push plate 106 system can flexibly respond to the up and down movement of the frame 104, ensuring that the fluidity of the cooling medium always remains in the best state, avoiding the uneven cooling caused by stagnation or poor flow of the medium during the cooling process. When the frame 104 moves up and down, the pulling force of the traction rope 306 enables the push plate 106 to push or return the cooling medium at an appropriate time, realizing precise control of the flow direction and speed of the cooling medium, thereby further improving the cooling uniformity and cooling efficiency of the workpiece.

[0068] As a further solution of the present invention, the vibration component includes a bracket 400 connected to the second connecting rod 203, a boss 401 is connected to the bracket 400, a rotating shaft 402 is rotatably connected in the box 102, and a cam 403 is connected to the rotating shaft 402;

[0069] By setting the rotating shaft 402, when the rotating shaft 402 rotates, the cam 403 and the boss 401 can be used to move the frame 104 upward. When the cam 403 leaves the boss 401, the frame 104 can be reset by the force of the first spring 204, so as to achieve the purpose of moving the frame 104 up and down in the box 102, and effectively enhance the cooling effect of the workpiece through periodic up and down vibration. This design can not only improve the cooling uniformity of the workpiece, but also reduce the stress concentration phenomenon that may occur during the cooling process, and ensure the overall quality and performance of the workpiece. In addition, after the top cover 105 is buckled on the frame 104, the top cover 105 can press the position of the limited workpiece and prevent the workpiece from being displaced during the cooling process.

[0070] As a further solution of the present invention, the moving component includes a screw rod 500 rotatably connected to the work frame 101, a third connecting rod 501 threadedly connected to the screw rod 500 is connected to the top plate 103, a first gear 502 is connected to the screw rod 500, a second gear 503 meshing with the screw rod 500 is connected to the rotating shaft 402, a plurality of connecting grooves 504 are provided on the inner side wall of the first gear 502, a top rod 505 is slidably connected in the connecting groove 504, a fifth spring 506 is connected between the top rod 505 and the connecting groove 504, a plurality of top grooves 507 adapted to the top rod 505 are provided on the screw rod 500, and the top grooves 507 are semi-spherical grooves, a motor 508 is connected to the bottom of the box body 102, and a chain transmission mechanism 509 is connected between the driving shaft of the motor 508 and the rotating shaft 402;

[0071] By setting a motor 508, the driving shaft of the motor 508 is connected to the rotating shaft 402 through a chain transmission mechanism 509, so as to drive the rotating shaft 402 to rotate, thereby achieving the purpose of providing driving force for the rotating shaft 402. When the rotating shaft 402 rotates, the first gear 502 can be rotated through the second gear 503. When the top plate 103 is in the initial position and the movement of the top plate 103 is not restricted, the rotation of the first gear 502 can be achieved through the force of the fifth spring 506, so that the top rod 505 and the top groove 507 are sleeved, and the friction between the top rod 505 and the top groove 507 can be used to rotate the screw rod 500. The rotation of the screw rod 500 can move the top plate 103 downward through the third connecting rod 501 to achieve the purpose of moving the top plate 103. The elastic coefficient of the fifth spring 506 is greater than the first spring 204, which can ensure that there is a certain friction between the top rods 505 and the top rods 505, so that the top plate 103 can be smoothly reached. The top of the box body 102 is buckled with the box body 102. After the top plate 103 reaches the position of the box body 102, the top plate 103 moves to the extreme position. At this time, the rotation of the screw rod 500 is resisted. When the shaft 402 continues to rotate to vibrate the frame body 104, the first gear 502 rotates to overcome the force of the fifth spring 506, so that the top rod 505 is disengaged from the top groove 507. The first gear 502 can idle on the screw rod 500 to avoid the problem of motion conflict. This design realizes the precise movement of the top plate 103 through clever mechanical linkage, and does not require an additional power device to drive the rotation of the shaft 402 and the screw rod 500 respectively. Only one driving source is required, which reduces the equipment cost and the operating steps of the staff. It only needs to control the positive and negative rotation of the motor 508 drive shaft and pick up and place the workpiece to complete the quenching process of the frog, thereby greatly simplifying the operating process of the equipment and improving work efficiency. Through a motor 508 drive system, the top plate 103 can be accurately moved and the normal operation of the vibration function can be maintained, avoiding the limitations of traditional designs that require multiple power sources and complex control systems.The ingenious design of the top rod 505 and the top groove 507 enables the screw rod 500 to smoothly drive the top plate 103 to move, and avoid mechanical conflict and damage through the idling mechanism when reaching the limit position, thereby ensuring long-term stable operation of the equipment. In addition, when the top plate 103 moves downward to engage with the box body 102 and the rotating shaft 402 does not stop rotating, the first gear 502 will always rotate outside the screw rod 500, that is, the top rod 505 will be continuously sleeved and disengaged from the top groove 507. The friction force generated when the top rod 505 is sleeved and disengaged from the top groove 507 can be used to allow the top plate 103 to apply greater pressure during the covering process, thereby ensuring that the top plate 103 is tightly fitted with the top of the box body 102 during the up and down movement of the frame body 104 and the top cover 105 in the box body 102, thereby avoiding sealing failure caused by looseness or gap. Through this integrated design, the manufacturing and maintenance costs of the equipment are further reduced, while the convenience of operation and the stability of the process are improved, providing strong support for efficient and reliable quenching processes.

[0072] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A manufacturing process for a high-strength frog, characterized in that: The specific steps of this process are: Step 1: Material preparation, select high-strength alloy steel or rare earth alloy steel, composition: carbon 0.75%, chromium 1.0%, nickel 1.2%, molybdenum 0.2%, rare earth element 0.02%, smelt in an electric furnace to ensure accurate chemical composition; Step 2: Casting and preliminary processing: using precision casting technology, the molten metal is injected into the mold, and after cooling, the rough shape of the frog is formed, and preliminary processing is performed to remove the casting residue and adjust it to the target size with a tolerance of ±1mm; Step 3: preheating and quenching, preheating to 600°C, keeping warm for 30 minutes, heating to 900°C, keeping warm for 60 minutes, and then cooling by immersing in a 50°C polymer solution through a quenching device (100); Step 4: Tempering treatment, heating to 500℃, keeping warm for 60 minutes, heating with a resistance furnace or a gas furnace, and slowly cooling in air at a cooling rate of 5℃ / min until room temperature; Step 5: Finishing and inspection, turning, milling and grinding, ensuring the dimensional tolerance of ±0.5mm, surface roughness Ra1.6μm, hardness test (HRC 50-55), toughness test (≥50J / cm 2 ) and non-destructive testing (ultrasonic) to ensure there are no cracks; The quenching equipment (100) described in step 3 comprises a work frame (101), a box (102) is provided on the work frame (101), the box (102) is filled with a polymer solution for cooling the workpiece, a top plate (103) is provided on the top of the box (102), a frame (104) for storing the workpiece is provided between the top plate (103) and the box (102), the frame (104) is located on the top of the box (102), a top cover (105) for closing the frame (104) is provided on the top of the frame (104), a plurality of holes for medium flow are provided on the top cover (105) and the frame (104), two push plates (106) are provided between the top cover (105) and the top plate (103), and the push plates (106) ) can slide on the top plate (103), a moving component for moving the top plate (103) is provided between the work frame (101) and the top plate (103), the top plate (103) can buckle the top cover (105) on the frame (104) when the top plate (103) is moved downward to a preset position, the top plate (103) can buckle the box (102), a vibration component for moving the frame (104) up and down is provided between the box (102) and the frame (104), when the frame (104) moves upward in the box (102), the two push plates (106) can move away from each other, and when the frame (104) moves downward after moving upward, the two push plates (106) can move toward each other.

2. The manufacturing process of a high-toughness frog according to claim 1, characterized in that: The bottom of the top plate (103) is connected to a first rod (200), the bottom of the first rod (200) is slidably connected to a second rod (201), the top of the top cover (105) is connected to a first connecting rod (202) connected to the first rod (200), and the bottom of the frame (104) is connected to a second connecting rod (203) connected to the second rod (201).

3. The manufacturing process of a high-strength frog according to claim 2, characterized in that: A first spring (204) is connected between the first rod (200) and the second rod (201).

4. The manufacturing process of a high-toughness frog according to claim 2, characterized in that: The push plate (106) includes a first plate (205) slidably connected to the top plate (103), a second plate (206) slidably connected to the bottom of the first plate (205), and a second spring (207) is connected between the first plate (205) and the second plate (206).

5. The manufacturing process of a high-strength frog according to claim 4, characterized in that: The bottom of the top plate (103) is connected to a fixed shaft (300), both ends of the fixed shaft (300) are respectively connected to telescopic shafts (301) connected to the first plate (205), and a third spring (302) is connected between the telescopic shaft (301) and the fixed shaft (300).

6. The manufacturing process of a high-strength frog according to claim 4, characterized in that: The first rod (200) is provided with a sliding groove (303), the first connecting rod (202) is slidably connected in the sliding groove (303), a fourth spring (304) is connected between the first connecting rod (202) and the sliding groove (303), the first connecting rod (202) is provided with a connecting port (305), the bottom of the first connecting rod (202) is connected with a traction rope (306), and one end of the traction rope (306) passes through the connecting port (305) and is connected to the first plate (205).

7. The manufacturing process of a high-strength frog according to claim 2, characterized in that: The vibration component comprises a bracket (400) connected to the second connecting rod (203), a boss (401) is connected to the bracket (400), a rotating shaft (402) is rotatably connected in the box body (102), and a cam (403) is connected to the rotating shaft (402).

8. The manufacturing process of a high-toughness frog according to claim 7, characterized in that: The moving component comprises a screw rod (500) rotatably connected to the work frame (101); a third connecting rod (501) threadedly connected to the screw rod (500) is connected to the top plate (103); a first gear (502) is connected to the screw rod (500); a second gear (503) meshing with the screw rod (500) is connected to the rotating shaft (402); a plurality of connecting grooves (504) are formed on the inner side wall of the first gear (502); 04), a push rod (505) is slidably connected inside, a fifth spring (506) is connected between the push rod (505) and the connecting groove (504), a plurality of top grooves (507) adapted to the push rod (505) are opened on the screw rod (500), and the top grooves (507) are semi-spherical grooves, a motor (508) is connected to the bottom of the box body (102), and a chain transmission mechanism (509) is connected between the driving shaft of the motor (508) and the rotating shaft (402).

Images