Processing device and preparation process of forged steel valve stem nut

Abstract

The present invention relates to the technical field of valve stem nut processing, and specifically discloses a processing device for forged steel valve stem nuts and a preparation process thereof. The preparation process comprises five steps: material preparation, cold heading, modulation heat treatment, nitriding and QPQ treatment. The processing device comprises a cold heading machine box, a feeding mechanism, a workpiece conveying mechanism and a cold end forming device. The present invention changes the traditional hot forging process into a cold heading process. After the raw materials undergo six cold heading treatments, the surface of the prepared valve stem nut product is smooth, free of oxidation and decarburization, and the geometric dimension deviation of the product is small, which is beneficial to the consistency control of batch products and the subsequent tempering heat treatment, and the mechanical properties of the product are more controllable. The processing device immerses the entire cold heading process in coolant, so that the heat generated by the cold heading of the workpiece is dissipated. At the same time, the presence of the coolant can isolate the workpiece from the air during the cold heading process, thereby avoiding oxidation of the workpiece during the cold heading process and ensuring product quality.

Description

Technical Field

[0001] The invention relates to the technical field of valve stem nut processing, and particularly discloses a processing device for a forged steel valve stem nut and a preparation process thereof. Background Art

[0002] Forged steel valves are primarily used in pipelines in various systems of thermal power plants to shut off or connect media. Compared to other valves, forged steel valves are distinguished by their high temperature and high pressure characteristics, along with a unique self-sealing design. The higher the pressure, the more reliable the seal. These unique performance, technical characteristics, and specialized operating conditions make these valves uniquely suited to other products. Currently, the stem nuts of traditional forged steel valves are mostly formed using a hot forging process. This high temperature creates a surface oxygen layer, resulting in an uneven surface and a decarburized layer. This increases the blank's size and compromises performance stability. Currently, some nut processing has been shifted from hot forging to cold heading. Cold heading eliminates the need for heating, resulting in a spheroidized pearlite + ferrite microstructure. The tempered bainite obtained through quenching and tempering heat treatment has minimal grain size variation and consistent product consistency within a batch. However, due to limitations in existing cold heading machines for nuts, mass production is impractical, and the stem nuts produced have consistently exhibited quality issues.

[0003] For example, patent application number 2012105920909 discloses a cold forging device for pipe nuts and its cold forging process. The device includes a cutting mechanism, a feeding mechanism, a conveying mechanism, and six dies. The feeding mechanism corresponds to the position of the cutting mechanism, and the conveying mechanism moves the material between the feeding mechanism and the dies. The dies include a first die for pre-forging chamfers, a second die for forming the rod diameter, a third die for pre-forging the hexagonal shape of the head, a fourth and fifth die for back-extruding the inner hole and simultaneously fine-forging the hexagonal shape of the head, and a sixth die for forming the through hole. The six dies are arranged in sequence. This invention eliminates the need for expensive hexagonal bar stock as raw material, saving production costs. The workpiece is directly formed in the die, simplifying the process. However, a large amount of heat is generated during the cold forging process of valve stem nuts. Existing cold forging devices for pipe nuts cannot timely cool the workpiece during the cold forging process, resulting in heat still being generated on the surface of the nut workpiece. When the nut workpiece is exposed to air at high temperatures, a surface oxygen layer is easily formed, resulting in poor quality of the produced valve stem nut. Therefore, in response to the shortcomings of the existing hot forging process for valve stem nuts and the existing cold heading device for pipe nuts when processing workpieces, the present invention proposes a processing device and a preparation process for forged steel valve stem nuts that can effectively solve the above-mentioned technical problems, so as to solve the above-mentioned technical problems of the existing hot forging process for valve stem nuts and the existing cold heading device for pipe nuts when processing workpieces. Summary of the Invention

[0004] The purpose of the present invention is to provide a processing device and a preparation process for a forged steel valve stem nut to solve the existing

[0005] The present invention is achieved through the following technical solutions:

[0006] A preparation process for a forged steel valve stem nut comprises the following steps:

[0007] S1: Select stainless steel coils with no surface defects as raw materials:

[0008] S2: The stainless steel wire coil in step 1 is first cut to a fixed length, and then subjected to six cold heading processes to obtain a semi-finished product;

[0009] S3: The semi-finished product obtained in step 2 is first quenched and then tempered and kept warm;

[0010] S4: nitriding the semi-finished product after heat treatment in step 3;

[0011] S5: The finished product of the nitriding treatment in step 4 is QPQ treated, air-dried and oil-infiltrated, and then stored.

[0012] The present invention also discloses a processing device for the forged steel valve stem nut. The processing device is the equipment used in the steps, which includes a cold heading machine box, a feeding mechanism, a workpiece conveying mechanism and a cold end forming device. The feeding mechanism is arranged at the left end of the cold heading machine box, and a finished product discharge plate is arranged at the right end of the cold heading machine box. A coolant tank is arranged on the side of the cold heading machine box. The coolant tank is connected to the bottom of the cold heading machine box through an infusion pipe, and an infusion pump is arranged on the infusion pipe.

[0013] The cold end forming device includes an upper die base and a lower die base, six upper die heads are arranged at equal intervals on the left and right sides of the lower surface of the upper die base, and a forming die body is arranged on the upper surface of the lower die base, which is aligned with each upper die head. The upper end of the cold heading machine box is provided with a first hydraulic device, and the lower end of the first hydraulic device is connected to the upper die base. The lower end of the cold heading machine box is provided with a second hydraulic device, and the top end of the second hydraulic device is connected to the lower die base. The lower die base extends out of the coolant setting in the cold heading machine box under the action of the second hydraulic device;

[0014] The workpiece conveying mechanism includes a guide bar horizontally arranged on the side of the cold heading machine case, and the guide bar is located in a horizontal position between the upper die base and the lower die base. A moving bar is provided in the guide bar for sliding left and right. Six clamping components are arranged at equal intervals on the moving bar, and each clamping component is aligned with the corresponding upper die head and forming die body respectively. A driving device for realizing directional movement of the moving bar is provided on the guide bar.

[0015] As a further arrangement of the above scheme, a vertically arranged piston cylinder is fixed on the bottom wall of the cold heading machine case, the lower end of the piston cylinder is connected to an air pipe, the end of the air pipe is connected to an elastic expansion body, the lower surface of the lower die base is fixedly connected to a piston rod, and the lower end of the piston rod is connected to a sealing piston extended into the piston cylinder.

[0016] As a further arrangement of the above scheme, a hydraulic sensor is provided on the lower surface of the cold heading machine case, a liquid level probe at the upper end of the hydraulic sensor is extended into the cold heading machine case, a control box is provided on the front side of the cold heading machine case, the hydraulic sensor is electrically connected to the control module in the control box, and the infusion pump is electrically connected to the output end of the control module.

[0017] As a further configuration of the above scheme, a temperature sensor is provided in the cold heading machine case, and the temperature sensor is electrically connected to the control module in the control box. A semiconductor refrigerator is provided on the bottom wall of the coolant tank, and the semiconductor refrigerator is electrically connected to the output end of the control module.

[0018] As a specific setting of the above scheme, the feeding mechanism includes a wire coil arranged on the rear side of the cold heading machine case and a feeding wheel group arranged at the upper left end of the cold heading machine case. The lower end of the feeding wheel group is provided with a feeding motor for driving the feeding wheel group to rotate. The left end of the inner cavity of the cold heading machine case is provided with a guide wheel group. The steel wire raw material on the wire coil is fed in a fixed length by the feeding wheel group and moves vertically downward at a fixed length under the action of the guide wheel group. A steel wire raw material cutting mechanism is provided in the cold heading machine case below the guide wheel group.

[0019] As a specific setting of the above scheme, the steel wire raw material cutting mechanism includes a fixed cutting blade fixedly arranged on the rear side of the cold heading machine box, a movable cutting blade is staggered up and down on the front side of the fixed cutting blade, and a third hydraulic device for pushing the movable cutting blade is provided on the front side of the cold heading machine box.

[0020] As a further arrangement of the above scheme, guide blocks are provided on the front and rear side surfaces of the lower die base, and a guide slide is provided on the guide block. Vertical guide rails matching the guide slide are connected to the front and rear inner walls of the cold heading machine case. A guide slide is connected to the upper surface of the upper die base, and a through hole matching the guide slide is provided on the upper surface of the cold heading machine case.

[0021] As a specific setting of the above solution, the clamping assembly includes two symmetrically arranged clamping blocks, and clamping grooves are opened on the opposite surfaces of the outer ends of the two clamping blocks, and a bidirectional telescopic cylinder is connected between the inner ends of the two clamping blocks.

[0022] As a specific setting of the above scheme, the driving device includes a driving motor fixed to the upper end of the guide bar, the output shaft of the driving motor is connected to a driving gear, and the upper surface of the moving bar is provided with a rack meshing with the driving gear.

[0023] Beneficial effects:

[0024] 1) This invention replaces the traditional hot forging process with a cold heading process. After six cold heading processes, the resulting valve stem nut has a smooth surface, free of oxidation and decarburization. The cold heading process also minimizes geometric dimensional deviations, facilitating consistent batch production. It also minimizes internal metallographic structure deviations, facilitating subsequent tempering heat treatment and enhancing controllability of the product's mechanical properties.

[0025] 2) The processing device for forged steel valve stem nuts designed in the present invention utilizes the up and down movement of the upper die base and the lower die base during operation, and can immerse the entire cold heading process in the coolant, so that the heat generated by the workpiece due to cold heading can be fully dissipated. At the same time, the presence of the coolant can isolate the workpiece from the air during the cold heading process, avoiding oxidation of the workpiece during the cold heading process and ensuring product quality.

[0026] 3) The present invention also further improves the design of the processing device. During the downward movement of the lower die base, the air in the piston cylinder is injected into the elastic expansion body, so that the volume of the elastic expansion body becomes larger. Then, under the action of the elastic expansion body, the liquid level in the cold heading box can be raised, so that the product is fully immersed in the coolant during the entire cold heading process; at the same time, the liquid level sensor and temperature sensor provided can perform real-time dynamic monitoring of the coolant in the cold heading box. Once an abnormality occurs, the control module will promptly issue a control instruction for adjustment to ensure stable operation of the valve stem nut during the cold heading process, so that the valve stem nut can be continuously cold headed, which greatly ensures the processing efficiency of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 This is a schematic diagram of the three-dimensional structure of the processing device of the present invention from a first angle;

[0029] Figure 2 This is a schematic diagram of the three-dimensional structure of the processing device of the present invention from a first angle;

[0030] Figure 3 Schematic diagram of the internal planar structure of the cold heading machine case according to the present invention;

[0031] Figure 4 Schematic diagram of the internal planar structure of the cold heading machine case in the present invention from a side view;

[0032] Figure 5 It is a schematic diagram of the three-dimensional structure of the lower die base and the forming die body in the present invention;

[0033] Figure 6 Schematic diagram of the three-dimensional structure of the upper die base and the upper die head in the present invention;

[0034] Figure 7 Schematic diagram of the three-dimensional structure of the workpiece conveying mechanism of the present invention;

[0035] Figure 8 Schematic diagram of the three-dimensional structure of the clamping assembly in the present invention;

[0036] Figure 9 This is a schematic diagram of the three-dimensional structure of the piston cylinder, elastic expansion body, piston rod, etc. in the present invention;

[0037] Figure 10 Schematic diagram of the internal planar structure of the coolant tank in the present invention.

[0038] in:

[0039] 1-cold heading machine box, 100-coolant, 101-finished product discharge plate;

[0040] 2-feeding mechanism, 201-wire coil, 202-feeding wheel assembly, 203-feeding motor, 204-guide wheel assembly, 205-fixed cutting blade, 206-movable cutting blade, 207-third hydraulic device;

[0041] 3-workpiece conveying mechanism, 301-guide rail, 302-moving bar, 303-clamping assembly, 3031-clamping block, 3032-bidirectional telescopic cylinder, 303-driving device, 3041-driving motor, 3042-driving gear, 3043-rack;

[0042] 4-cold end forming device, 401-upper die base, 402-lower die base, 4021-guide block, 403-upper die head, 404-forming die body, 405-first hydraulic device, 406-second hydraulic device, 407-vertical guide rail, 408-guide slide;

[0043] 5-coolant tank, 501-infusion tube, 502-infusion pump, 503-semiconductor refrigerator;

[0044] 601-piston cylinder, 602-air pipe, 603-elastic expansion body, 604-piston rod, 605-sealing piston;

[0045] 701-Hydraulic sensor, 702-Liquid level probe, 703-Control box, 704-Temperature sensor. DETAILED DESCRIPTION

[0046] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings 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 in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0047] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Figures 1 to 10 , and describes the application in detail with reference to embodiments.

[0048] Example 1

[0049] Example 1 discloses a process for preparing a forged steel valve stem nut, which mainly includes five steps: material preparation, cold heading, modulated heat treatment, nitriding treatment, and QPQ treatment. The specific steps are as follows:

[0050] Step 1: Select qualified 1CR13 stainless steel wire material, and require the surface of the raw material to be free of any defects.

[0051] Step 2: The stainless steel wire coil is first cut into fixed lengths, and then passed through six sets of dies for cold heading to obtain semi-finished products.

[0052] Step 3: First heat to 1000℃ and keep warm for 2h, then take out of the furnace and oil quench; after quenching, heat to 680℃ and keep warm for 4h, then air cool.

[0053] Step 4: Treat the product according to the nitriding process in the heat treatment manual. Place the product in a vacuum and heat it to 400℃ and keep it at a constant temperature for 1 hour. Then put it into the liquid nitriding furnace and heat it to 560℃ and keep it at that temperature for 12 hours. Then take it out of the furnace and cool it with water.

[0054] Step 5: Perform QPQ treatment on the finished valve stem nut after nitriding, air-dry and oil-dry before storage.

[0055] The preparation process of the forged steel valve stem nut disclosed in this embodiment 1 changes the traditional hot forging process to a cold heading process. After the raw material undergoes six cold heading processes, the surface of the prepared valve stem nut product is smooth, free of oxidation and decarburization. At the same time, the geometric dimension deviation is small, which is conducive to the consistency control of batch products. The internal metallographic structure deviation of the product is small, which is conducive to the later tempering heat treatment. The mechanical properties of the product (hardness, tensile strength, guaranteed load) are more controllable. The hardness of the blank has no dispersion, which is conducive to the later processing process and makes the product surface roughness better.

[0056] Example 2

[0057] Example 2 discloses a processing device for the forged steel valve stem nut in Example 1. Figure 1 , Attachment Figure 2 and attached Figure 3 The main body of the processing device for forged steel valve stem nuts includes a cold heading machine box 1, a feeding mechanism 2, a workpiece conveying mechanism 3 and a cold end forming device 4.

[0058] Reference Attachment Figure 3 , Attachment Figure 5 and attached Figure 6 The cold end forming device 4 includes an upper die base 401 and a lower die base 402. Six upper die heads 403 are arranged at equal intervals on the lower surface of the upper die base 401, and a forming die body 404 is arranged on the upper surface of the lower die base 402, aligned vertically with each upper die head 403. At the same time, a first hydraulic device 405 is provided at the upper end of the cold heading machine box 1, and the lower end of the first hydraulic device 405 is connected to the upper die base 401. A second hydraulic device 406 is provided at the lower end of the cold heading machine box 1, and the top end of the second hydraulic device 406 is connected to the lower die base 402. Under the action of the second hydraulic device 406, the lower die base 402 can extend to the horizontal level of the coolant 100 in the cold heading machine box 1. Then, during the cold heading process, the second hydraulic device 406 is controlled to shorten, so that the cold heading process is carried out in the coolant 100, thereby quickly dissipating heat from the workpiece during the cold heading process.

[0059] To ensure the stability of the upper die base 401 and the lower die base 402 during their upward and downward movement, guide blocks 4021 are provided on the front and rear sides of the lower die base 402. Guide slides are provided on the guide blocks 4021, and vertical guide rails 407 that match the guide slides are connected to the front and rear inner walls of the cold heading machine case 1. A guide slide 408 is connected to the upper surface of the upper die base 401, and a through hole that matches the guide slide 408 is provided on the upper surface of the cold heading machine case 1.

[0060] Reference Attachment Figure 3 , Attachment Figure 7 and attached Figure 8The workpiece conveying mechanism 3 includes a guide rail 301 horizontally arranged on the side of the cold heading machine case 1, and the guide rail 301 is arranged in a horizontal position between the upper die base 401 and the lower die base 402. A movable bar 302 is arranged to slide left and right in the guide rail 301, and six clamping assemblies 303 are arranged at equal intervals on the movable bar 302, and each clamping assembly 303 is aligned with the corresponding upper die head 403 and the forming die body 404. The specific clamping assembly 303 includes two symmetrically arranged clamping blocks 3031, and clamping grooves are provided on the opposite surfaces of the outer ends of the two clamping blocks 3031. A two-way telescopic cylinder 3032 is connected between the inner ends of the two clamping blocks 3031. By controlling the extension or contraction of the two-way telescopic cylinder 3032, the two clamping blocks 3031 can be moved closer to or away from each other, thereby achieving clamping and releasing of the cold heading workpiece.

[0061] In addition, a drive device 304 is provided on the guide bar 301 to achieve directional movement of the movable bar 302. Specifically, the drive device 304 includes a drive motor 3041 fixed to the upper end of the guide bar 301. The output shaft of the drive motor 3041 is connected to a drive gear 3042. The upper surface of the movable bar 302 is provided with a rack 3043 that meshes with the drive gear 3042. By controlling the forward and reverse rotation of the drive motor 3041, and then the meshing transmission of the drive gear 3042 and the rack 3043, the movable bar 302 can be moved back and forth, thereby achieving fixed-point transportation of the workpiece after the cold end.

[0062] Reference Attachment Figure 1 , Attachment Figure 3 and attached Figure 7, the feeding mechanism 2 is set at the left end of the cold heading machine box 1, and the finished product discharge plate 101 is set at the right end of the cold heading machine box 1. The specific feeding mechanism 2 includes a wire coil 201 set on the rear side of the cold heading machine box 1 and a feeding wheel group 202 set at the upper left end of the cold heading machine box 1. A feeding motor 203 is set at the lower end of the feeding wheel group 202 for driving the feeding wheel group 202 to rotate, and then a guide wheel group 204 is set at the left end of the inner cavity of the cold heading machine box 1, so that the steel wire raw material on the wire coil 201 is fed in at a fixed length by the feeding wheel group 202, and moves vertically downward at a fixed length under the action of the guide wheel group 204. At the same time, a steel wire raw material cutting mechanism is also provided in the cold heading machine case 1 located below the guide wheel group 204. The steel wire raw material cutting mechanism includes a fixed cutting blade 205 fixedly provided on the rear side of the cold heading machine case 1, a movable cutting blade 206 is staggered up and down on the front side of the fixed cutting blade 205, and a third hydraulic device 207 for pushing the movable cutting blade 206 is provided on the front side of the cold heading machine case 1. The stainless steel wire raw material is inserted at a fixed length through the feeding mechanism 2, pushed vertically downward through the guide wheel group 204, and then pushed toward the fixed cutting blade 205 under the action of the third hydraulic device 207, thereby completing the fixed-length cutting of the raw material, and is clamped and fixed by the clamping assembly 303 at the far left during the cutting process.

[0063] Finally, a coolant tank 5 is provided on the side of the cold heading machine case 1. The coolant tank 5 is connected to the bottom of the cold heading machine case 1 through an infusion pipe 501, and an infusion pump 502 is provided on the infusion pipe 501. The infusion pump 502 replenishes coolant into the cold heading machine case 1 in a quantitative and regular manner to prevent the coolant water level from being too low and unable to cool the workpiece during the cold heading process.

[0064] Example 3

[0065] Example 3 discloses a technical solution for dynamically monitoring the coolant in the cold heading machine box 1 and timely replenishing and adjusting it based on Example 2. The similarities between it and Example 2 are not described again. The differences can be found in the attached Figure 3 , Attachment Figure 4 , Attachment Figure 9 and attached Figure 10 .

[0066] In this embodiment 3, a vertically arranged piston cylinder 601 is also fixed on the bottom wall of the cold heading machine case 1. Specifically, the number of piston cylinders 601 can be set to two. An air supply pipe 602 is connected to the lower end of each piston cylinder 601, and an elastic expansion body 603 is connected to the end of the air supply pipe 602. A piston rod 604 is fixedly connected to the lower surface of the lower die base 402, and a sealing piston 605 is connected to the lower end of the piston rod 604 and is extended into the piston cylinder 601. During the cold heading process, the downward movement of the lower die base 402 can push the piston rod 604 and the sealing piston 605 downward along the piston cylinder 601, thereby sending the air in the piston cylinder 601 into the elastic expansion body 603, causing the elastic expansion body 603 to expand rapidly, thereby raising the liquid level of the coolant in the cold heading machine case 1 and preventing the liquid level from being too low during the cold heading process.

[0067] In addition, a hydraulic sensor 701 is provided on the lower surface of the cold heading machine case 1, and the liquid level probe 702 at the upper end of the hydraulic sensor 701 is extended into the cold heading machine case 1. A control box 703 is provided on the front side of the cold heading machine case 1. The hydraulic sensor 701 is electrically connected to the control module in the control box 703, and the infusion pump 502 is electrically connected to the output end of the control module.

[0068] Finally, a temperature sensor 704 is also provided in the cold heading machine case 1, and the temperature sensor 704 is electrically connected to the control module in the control box 703. A semiconductor cooler 503 is provided on the bottom wall of the coolant tank 5, and the semiconductor cooler 503 is electrically connected to the output end of the control module.

[0069] The above-mentioned hydraulic sensor 701 monitors the liquid level of the coolant in the cold heading machine box 1 in real time. Once the liquid level is lower than the set value, the control module controls the infusion pump 502 to start, thereby timely replenishing the coolant in the coolant tank 5 into the cold heading machine box 1. At the same time, the temperature sensor 704 also monitors the coolant temperature in the cold heading machine box 1. Once the coolant temperature in the cold heading machine box 1 is too high, the semiconductor refrigerator 503 is promptly controlled to cool the coolant in the coolant tank 5, and then the low-temperature coolant is sent to the cold heading machine box 1 to achieve the effect of regulating the coolant temperature and ensure sufficient heat dissipation during the cold heading process.

[0070] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A processing device for forged steel valve stem nuts, characterized in that: The processing device is used to cut the stainless steel wire coil into a fixed length and then process it into semi-finished products through six cold heading processes in sequence; The processing device comprises a cold heading machine box (1), a feeding mechanism (2), a workpiece conveying mechanism (3) and a cold end forming device (4), wherein the feeding mechanism (2) is arranged at the left end of the cold heading machine box (1), a finished product discharge plate (101) is arranged at the right end of the cold heading machine box (1), a coolant tank (5) is arranged beside the cold heading machine box (1), the coolant tank (5) is connected to the bottom of the cold heading machine box (1) via a liquid infusion pipe (501), and a liquid infusion pump (502) is arranged on the liquid infusion pipe (501); The cold end forming device (4) comprises an upper die base (401) and a lower die base (402), six upper die heads (403) are arranged at equal intervals on the lower surface of the upper die base (401), and a forming die body (404) is arranged on the upper surface of the lower die base (402) and aligned with each upper die head (403) in the upper and lower directions. The upper end of the cold heading machine box (1) is provided with a first hydraulic device (405), and the lower end of the first hydraulic device (405) is aligned with the upper die base (401). ), a second hydraulic device (406) is provided at the lower end of the cold heading machine box (1), the top end of the second hydraulic device (406) is connected to the lower die base (402), and the lower die base (402) can extend to the horizontal level of the coolant (100) in the cold heading machine box (1) under the action of the second hydraulic device (406), and the second hydraulic device (406) is controlled to shorten during the cold heading process, so that the cold heading process is carried out in the coolant (100); The workpiece conveying mechanism (3) comprises a guide rail (301) horizontally arranged on the side of the cold heading machine box (1), and the guide rail (301) is arranged at a horizontal position between the upper die base (401) and the lower die base (402), a moving bar (302) is arranged in the guide rail (301) to slide left and right, six clamping components (303) are arranged at equal intervals on the moving bar (302), and each clamping component (303) is aligned with the corresponding upper die head (403) and the forming die body (404), and a driving device (304) is arranged on the guide rail (301) to realize the directional movement of the moving bar (302); A vertically arranged piston cylinder (601) is fixed on the bottom wall of the cold heading machine box (1); the lower end of the piston cylinder (601) is connected to an air supply pipe (602); the end of the air supply pipe (602) is connected to an elastic expansion body (603); a piston rod (604) is fixedly connected to the lower surface of the lower die base (402); the lower end of the piston rod (604) is connected to a sealing piston (605) that extends into the piston cylinder (601).

2. The processing device for forged steel valve stem nut according to claim 1, characterized in that: A hydraulic sensor (701) is provided on the lower surface of the cold heading machine box (1), a liquid level probe (702) at the upper end of the hydraulic sensor (701) is extended into the cold heading machine box (1), a control box (703) is provided on the front side of the cold heading machine box (1), the hydraulic sensor (701) is electrically connected to a control module in the control box (703), and the infusion pump (502) is electrically connected to an output end of the control module.

3. The processing device for forged steel valve stem nut according to claim 2, characterized in that: A temperature sensor (704) is provided in the cold heading machine box (1), and the temperature sensor (704) is electrically connected to a control module in the control box (703). A semiconductor cooler (503) is provided on the bottom wall of the coolant tank (5), and the semiconductor cooler (503) is electrically connected to an output end of the control module.

4. The processing device for forged steel valve stem nut according to claim 1, characterized in that: The feeding mechanism (2) comprises a wire coil (201) arranged on the rear side of the cold heading machine case (1) and a feeding wheel group (202) arranged at the upper left end of the cold heading machine case (1); a feeding motor (203) for driving the feeding wheel group (202) to rotate is arranged at the lower end of the feeding wheel group (202); a guide wheel group (204) is arranged at the left end of the inner cavity of the cold heading machine case (1); the steel wire material on the wire coil (201) is fed in at a fixed length by the feeding wheel group (202) and moves vertically downward at a fixed length under the action of the guide wheel group (204); and a steel wire material cutting mechanism is arranged in the cold heading machine case (1) below the guide wheel group (204).

5. The processing device for forged steel valve stem nut according to claim 4, characterized in that: The steel wire raw material cutting mechanism comprises a fixed cutting blade (205) fixedly arranged on the rear side of the cold heading machine box (1); a movable cutting blade (206) is arranged on the front side of the fixed cutting blade (205) in an upper and lower staggered manner; and a third hydraulic device (207) for pushing the movable cutting blade (206) is provided on the front side of the cold heading machine box (1).

6. The processing device for forged steel valve stem nut according to claim 1, characterized in that: The front and rear side surfaces of the lower die base (402) are provided with guide blocks (4021), and a guide slide is provided on the guide block (4021). The front and rear inner walls of the cold heading machine case (1) are connected with vertical guide rails (407) that match the guide slide. The upper surface of the upper die base (401) is connected with a guide slide bar (408), and the upper surface of the cold heading machine case (1) is provided with a through hole that matches the guide slide bar (408).

7. The processing device for forged steel valve stem nuts according to claim 1, characterized in that: The clamping assembly (303) comprises two symmetrically arranged clamping blocks (3031), and clamping grooves are provided on opposite surfaces of the outer ends of the two clamping blocks (3031). A bidirectional telescopic oil cylinder (3032) is connected between the inner ends of the two clamping blocks (3031).

8. The processing device for forged steel valve stem nuts according to claim 1, characterized in that: The driving device (304) comprises a driving motor (3041) fixed to the upper end of the guide rail (301); a driving gear (3042) is connected to the output shaft of the driving motor (3041); and a rack (3043) meshing with the driving gear (3042) is provided on the upper surface of the moving bar (302).

Images