Gear quenching stereoscopic heating device

Abstract

The scheme discloses a gear quenching three-dimensional heating device, and belongs to the technical field of gear quenching, comprising three vertically stacked quenching units, a supporting table, a high-frequency alternating power supply and a controller. The middle quenching unit coil has the largest diameter to be sleeved on the workpiece, and the upper and lower coils have smaller diameters to heat the gear tooth root; the upper quenching unit is rotatably connected with the middle unit, and when avoiding obstacles, the rotation allows the coil size to be reduced to be close to the gear tooth root, and when fixedly connected, the coil is adapted to the vertical penetration of the workpiece; the height difference between adjacent units is 1.5-2.5 cm to prevent magnetic field interference. The coils form a three-dimensional magnetic field by the same frequency and the same phase current, solve the problem of insufficient heating of the gear tooth root of a large-diameter gear, and improve the quenching uniformity and efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of gear quenching technology, specifically relating to a three-dimensional heating device for gear quenching. Background Technology

[0002] Gear quenching is a heat treatment process for gears. Its core purpose is to change the internal structure of the gear material by heating, holding and then rapidly cooling the gear, thereby significantly improving the mechanical properties of the gear such as surface hardness, wear resistance and fatigue strength, so as to meet the working requirements of the gear to withstand high load and high friction during transmission.

[0003] In the quenching process of gears with a diameter of 800mm or more, the traditional gear quenching method mainly relies on a single coil. This coil is wrapped around the outside of the gear, and heating is achieved by passing a high-frequency alternating current through the coil based on the principle of electromagnetic induction. This single-coil quenching method results in the gear tooth tip being close to the coil and the tooth root being far from the coil, causing a temperature difference between the tooth tip and the tooth root, thus generating thermal stress and affecting the production quality of the gear. Utility Model Content

[0004] This invention proposes a three-dimensional heating device for gear quenching, which is used to heat the tooth tip and tooth root of the gear more uniformly, thereby reducing the generation of thermal stress.

[0005] To achieve the above objectives, the present invention proposes the following technical content: A gear quenching three-dimensional heating device, comprising: There are at least 3 quenching units, which are stacked in sequence. The 3 quenching units are referred to as the upper quenching unit, the middle quenching unit, and the lower quenching unit from top to bottom. The middle quenching unit and the lower quenching unit are fixedly connected, and the upper quenching unit is fixedly connected to the middle quenching unit or rotatedly connected. Each quenching unit includes: Insulated mounting posts; Both conductive terminals are fixedly connected to the mounting post, and the two conductive terminals do not contact each other; high-frequency alternating cables are connected to both conductive terminals. The quenching coil is fixedly connected to two conductive terminals at both ends; the quenching coil is connected and communicated with the coolant circulation component; the plane enclosed by the quenching coil is parallel to the horizontal plane; the diameter of the quenching coil in the middle quenching unit is larger than the diameter of the quenching coil in the upper or lower quenching unit. A quick connector that connects simultaneously to a high-frequency alternating cable on two conductive terminals; A high-frequency alternating power supply, connected to a quick connector, is used to supply high-frequency alternating current to the quenching coil through a high-frequency alternating cable and conductive terminals; The support platform is used to place the workpiece. When the workpiece is placed on the support platform, the end plane of the workpiece is parallel to the horizontal plane. The quenching coil of the upper quenching unit is located above the upper end plane of the workpiece, the quenching coil of the middle quenching unit is sleeved on the workpiece, and the quenching coil of the lower quenching unit is located below the lower end plane of the workpiece. The controller is used to control the power supply of the high-frequency alternating power source.

[0006] The advantages of this solution are as follows: The device includes at least three quenching units stacked sequentially. The quenching coil of the upper quenching unit is located above the upper end plane of the workpiece, the quenching coil of the middle quenching unit is sleeved on the workpiece, and the quenching coil of the lower quenching unit is located below the lower end plane of the workpiece. This three-dimensional layout can heat the workpiece from multiple directions, providing thermal compensation for the tooth root and avoiding a large temperature difference between the tooth root and the tooth tip. Furthermore, it creates a three-dimensional heating environment, further improving the temperature difference between the tooth tip and the tooth root and reducing thermal stress.

[0007] Furthermore, the height of the support platform is lower than the height of the quenching coil of the upper quenching unit. When the upper quenching unit and the middle quenching unit are rotatably connected, the mounting column of the upper quenching unit and the mounting column of the middle quenching unit are rotatably connected by bearings. The rotating shaft is set vertically. The mounting column of the upper quenching unit and the mounting column of the middle quenching unit are respectively provided with a first cavity and a second cavity. A gear ring is installed on the inner wall of the first cavity. A servo motor for driving the mounting column of the upper quenching unit to rotate is installed in the second cavity. A drive gear is installed on the rotating shaft of the servo motor. The drive gear meshes with the gear ring for transmission.

[0008] In the design of fixed quenching coils, because the workpiece needs to be placed vertically through the coil, the inner diameter of the coil must be larger than the tip circle diameter of the workpiece's teeth. This results in a large distance between the coil and the root of the workpiece's teeth, making it impossible to effectively heat the root. This solution addresses this problem by using a bearing-driven rotating connection between the upper and middle quenching units, and driving the upper quenching unit to rotate via a servo motor. When the robot places or removes the workpiece, the servo motor can rotate the quenching coil of the upper quenching unit to a position that avoids the vertical movement path of the workpiece, eliminating the need to reserve space for the workpiece to pass through. Therefore, the inner diameter of the quenching coil of the upper quenching unit is no longer limited by the requirement of being "larger than the tip circle diameter of the workpiece's teeth," allowing for a smaller design. This enables it to be closer to the root of the workpiece's teeth, significantly improving the supplementary heating effect and solving the problem of insufficient heating of the tooth root by traditional fixed coils.

[0009] Furthermore, ignoring the difference in the inner diameter of the three quenching coils, the quenching coils of the three quenching units are arranged in a vertical array, and high-frequency alternating currents with the same frequency and phase are passed through the three quenching coils.

[0010] Three quenching coils are arranged in a vertical array (with coincident axes and layered heights), and are supplied with high-frequency alternating currents of the same frequency and phase. This ensures that the alternating magnetic fields generated by each coil are in the same direction and do not cancel each other out. This design creates a "three-dimensional enveloping" superposition of magnetic fields on the upper end plane, outer tooth, and lower end plane of the gear. The magnetic field strength is evenly distributed along the height of the gear: the middle coil mainly acts on the tooth tip region, while the upper and lower coils supplement the tooth root region. The magnetic fields of the three coils work together to enhance each other, avoiding localized weak heating areas caused by chaotic magnetic field direction, and further reducing the temperature difference between the tooth tip and tooth root.

[0011] Furthermore, the inner diameter of the quenching coil of the upper quenching unit is smaller than the tooth tip circle diameter of the workpiece. The inner diameter of the quenching coil of the upper quenching unit is 780mm, and the tooth tip circle diameter of the workpiece is 800mm.

[0012] Furthermore, the inner diameter of the quenching coil in the upper quenching unit is designed to be smaller than the tooth tip circle diameter of the workpiece. This size design allows the quenching coil of the upper quenching unit to avoid the tooth tip and be closer to the tooth root position of the workpiece (by specifying the specific values ​​of the tooth tip circle diameter and the inner diameter of the coil, the relative positional relationship between the coil and the tooth root can be intuitively reflected), thereby enhancing the heating intensity of the tooth root area and effectively improving the problem of insufficient tooth root heating.

[0013] Furthermore, when the upper quenching unit and the middle quenching unit are fixedly connected, the inner diameter of the quenching coil of the upper quenching unit is greater than or equal to the tooth tip circle diameter of the workpiece, the inner diameter of the quenching coil of the upper quenching unit is 800~810mm, and the tooth tip circle diameter of the workpiece is 800mm.

[0014] Since the fixed connection cannot be avoided by rotation, the workpiece needs to pass directly through the upper quenching coil vertically. Therefore, the inner diameter of the coil must be greater than or equal to the tooth tip circle diameter to avoid interference during placement / removal. Limiting the inner diameter of the coil to 800~810mm (only 0~10mm larger than the tooth tip circle diameter) can meet the space requirement for the workpiece to pass through vertically, and minimize the distance between the coil and the tooth root (avoiding insufficient heating of the tooth root due to an excessively large coil). This optimizes the tooth root heating effect under the structural constraints of the fixed connection.

[0015] Furthermore, the height difference between two adjacent quenching units is 1.5~2.5cm.

[0016] The core component of the quenching unit is the quenching coil, which generates a high-frequency alternating magnetic field during operation. This magnetic field causes localized heating of the workpiece (such as the tooth root or tooth surface) through electromagnetic induction. If two adjacent coils are completely flush or the spacing is too small (<1.5cm), the magnetic fields of the adjacent coils will overlap and interfere with each other, resulting in uneven magnetic field distribution. This can lead to "local overheating" (excessively high temperature at the point where the magnetic fields overlap) or "insufficient heating" (insufficient temperature at the point where the magnetic fields cancel each other out) in the corresponding area of ​​the workpiece. Furthermore, the magnetic field interference will generate additional eddy current losses, affecting the coil's lifespan.

[0017] The beneficial effects that can be achieved by adopting the above technologies are: 1. Traditional gear quenching often relies on a single coil for heating, acting only unidirectionally from the outside of the gear. For large gears with a diameter of 800mm or more, the structure of the tooth tip being close to the coil and the tooth root being far away inevitably leads to a significant temperature difference between the tooth tip and the tooth root, easily generating thermal stress and causing quality problems such as tooth root cracking and tooth tip overheating. This solution uses a three-dimensional layout of "upper, middle, and lower quenching coils." The middle quenching unit coil has the largest diameter and is placed on the outside of the gear, prioritizing the main heating of the tooth tip area to ensure the basic hardness requirements of the tooth tip. The upper and lower quenching unit coils have smaller diameters, and their magnetic fields can precisely cover the "tooth root area far from the middle coil," forming a synergistic effect of "main heating of the tooth tip + supplementary heating of the tooth root." The three layers of coils form an all-round surrounding magnetic field along the axial and radial directions of the gear, reducing the temperature difference between different parts of the gear, effectively eliminating thermal stress, and ensuring that the overall hardness of large-diameter gears is uniform and the hardened layer depth is consistent after quenching, meeting the stringent requirements of high-load transmission for gear mechanical properties.

[0018] 2. Traditional fixed upper quenching coils are limited by the installation requirement that the workpiece must pass vertically through the coil. Their inner diameter must be larger than the gear tooth tip circle diameter, resulting in an excessive distance between the coil and the tooth root, causing severe attenuation of the magnetic field strength and failing to meet the tooth root fatigue strength requirements. This solution innovatively designs a rotary upper quenching unit: the upper quenching unit mounting column and the middle quenching unit mounting column are rotatably connected by bearings. Combined with a servo motor and gear ring meshing drive structure, during the workpiece placement / removal stage, the upper quenching coil can be driven to rotate 90° to avoid the vertical movement path of the workpiece, completely eliminating the limitation that "the coil inner diameter must be larger than the tooth tip circle diameter." Based on this, the inner diameter of the upper quenching coil can be designed to be smaller than the tooth tip circle diameter (e.g., when the workpiece tooth tip circle diameter is 800mm, the coil inner diameter is 780mm), shortening the distance between the coil inner wall and the tooth root. This significantly enhances the induced eddy currents in the tooth root region, and the heating rate and temperature quickly approach the tooth tip level.

[0019] 3. The height difference design between adjacent quenching units directly affects the magnetic field distribution and heating effect. If the spacing is too small (<1.5cm) or too large (>2.5cm), it will destroy the synergy of three-dimensional heating: if the spacing is too small, the magnetic fields of adjacent coils will overlap, forming a local strong magnetic field area, causing the corresponding part of the gear to overheat. If the spacing is too large, the magnetic field coverage of the coil will have a "blank zone", and the middle section of the gear axis cannot be effectively heated, forming a quenching blind zone. In subsequent use, it is easy to cause early wear due to insufficient local strength. This solution precisely limits the height difference between adjacent quenching units to 1.5-2.5cm. This spacing has been verified through magnetic field simulation and process testing. On the one hand, it effectively staggers the magnetic field areas of adjacent coils, with the upper coil focusing on the upper half of the gear tooth root and the middle coil covering the lower half of the gear tooth root, avoiding magnetic field superposition and interference, and ensuring that the heating temperature and rate of each area meet the process standards. On the other hand, the 1.5-2.5cm spacing can be flexibly adjusted according to the axial height of the gear (e.g., 30-60mm), which precisely covers the entire axial quenching area of ​​the gear, eliminating the risk of overheating due to overlap and eliminating heating blind spots, achieving a "continuous and uniform" quenching effect in the gear axial direction. At the same time, it reserves sufficient space for the arrangement of coil cooling water pipes and high-frequency cables, taking into account both equipment practicality and maintenance convenience. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of Example 1; Figure 2 This is a top view schematic diagram of the connection method between the mounting post, conductive terminal and quenching coil; Figure 3 This is a schematic diagram of the overall structure of Example 2; Figure 4 This is a schematic diagram of the internal structure of the mounting columns of the upper and middle quenching units in Example 2.

[0021] 1. Stand; 2. Mounting column; 3. Hardened coil; 4. Conductive terminal; 5. High-frequency alternating cable; 6. Quick connector; 7. High-frequency alternating power supply; 8. Support platform; 9. Workpiece; 10. Bearing; 11. Servo motor; 12. Gear ring. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] Example 1: As Figure 1 As shown, a gear quenching three-dimensional heating device includes the following structure: Stand 1, for placement on the ground; At least three quenching units are provided. In this embodiment, a total of three quenching units are provided. The three quenching units are stacked sequentially, and adjacent quenching units are fixedly connected by snap-fit. One of the quenching units is fixedly connected to the support frame 1. Therefore, the three quenching units and the support frame 1 are placed on the ground as a whole.

[0024] Each quenching unit includes: The mounting post 2, made of insulating ceramic material, is cylindrical in shape. Its axis is set vertically. As mentioned above, two adjacent quenching units are fixedly connected by the snap fasteners on the side wall of the mounting post 2, and the axes of the two mounting posts 2 coincide after connection.

[0025] Two conductive terminals 4 (see Figure 2 Both conductive terminals 4 and the mounting column 2 are fixedly installed on the circumferential side wall of the mounting column 2, and the two conductive terminals 4 do not contact each other. The two conductive terminals 4 are respectively used to fix and connect to both ends of the quenching coil 3 of the quenching unit. Thus, the two conductive terminals 4, the mounting column 2, and the quenching coil 3 are fixedly connected into a whole. The plane enclosed by the quenching coil 3 is parallel to the horizontal plane. The interior of the quenching coil 3 is a hollow structure, forming a coolant flow channel. The quenching coil 3 contains a coolant inlet and a coolant outlet. Both the inlet and outlet are connected and communicated with the coolant circulation component through flexible hoses. After the coolant is introduced, it is used to prevent the quenching coil 3 from overheating. This design is a conventional design in this field and is not the core of this solution, so it will not be described in detail.

[0026] Two conductive terminals 4 are connected to a quick connector 6 via high-frequency alternating cables 5. The quick connector 6 is connected to a high-frequency alternating power supply 7, which supplies high-frequency alternating current to the quenching coil 3 through the high-frequency alternating cables 5 and conductive terminals 4. The high-frequency alternating cables 5 of each quenching unit are arranged in a reasonable spatial layout to avoid tangling and thus prevent magnetic interference.

[0027] In this embodiment, the three quenching units are denoted from top to bottom as: upper quenching unit, middle quenching unit, and lower quenching unit. The distance (height difference) between the quenching coils 3 of two adjacent quenching units is 1.5~2.5cm, and the inner diameter of the quenching coils 3 is 800~1000mm. Based on the above design, the heating device of this scheme is used for quenching gears with a tooth tip circle diameter in the range of 800~900mm and a height of 30~60mm. When the gear to be quenched (hereinafter referred to as workpiece 9) is quenched (see...) Figure 3 The end plane of workpiece 9 is parallel to the horizontal plane. The quenching coil 3 of the upper quenching unit is located above the upper end plane of workpiece 9. The quenching coil 3 of the middle quenching unit is sleeved on workpiece 9 and does not contact workpiece 9. The quenching coil 3 of the lower quenching unit is located below the lower end plane of workpiece 9.

[0028] In the design, the inner diameters of the quenching coils 3 of the upper and lower quenching units are slightly smaller than the inner diameter of the quenching coil 3 of the middle quenching unit. In this embodiment, the inner diameter of the quenching coil 3 of the upper quenching unit is 800~810mm, the inner diameter of the quenching coil 3 of the middle quenching unit is 820mm, and the inner diameter of the quenching coil 3 of the lower quenching unit is 780mm. When the quenching coil 3 of the middle quenching unit is fitted onto the workpiece 9, the quenching coil 3 of the middle quenching unit can achieve a tooth tip circle distance of 0.5~1cm from the workpiece 9 (tooth tip circle diameter is 800mm).

[0029] The advantage of using three quenching coils is that, since the quenching coil 3 of the middle quenching unit is mounted on the workpiece 9, it is closer to the tooth tip and farther from the tooth root. The heating temperature at the tooth tip is higher than the temperature at the tooth root, resulting in insufficient quenching temperature at the tooth root. However, since the quenching coils 3 of the upper and lower quenching units are smaller than the quenching coil 3 of the middle quenching unit, they can further supplement the heating at the tooth root of the workpiece 9, forming a three-dimensional heating environment that meets the tooth root quenching temperature and compensates for the insufficient heating of the tooth root by the quenching coil 3 of the middle quenching unit.

[0030] The quenching coils 3 of the three quenching units all use single-turn coils. If the difference in diameter between the quenching coils 3 of the three quenching units is ignored, the three quenching units are arranged in an array along the axis of the mounting column 2 (e.g., Figure 1 (As shown). Furthermore, the quenching coils 3 of the three quenching units are simultaneously connected to the same high-frequency alternating current output from the same high-frequency alternating power supply 7, with the same frequency and phase. This ensures that the magnetic fields generated by the quenching coils 3 of the three quenching units are in the same direction and will not cancel each other out, thus affecting the quenching process.

[0031] Quenching process of workpiece 9 A suction cup-type robotic arm grasps workpiece 9 and passes it vertically from top to bottom through the quenching coils 3 of the upper and middle quenching units without interfering with them. The workpiece 9's central hole is then fitted onto a support platform 8 made of insulating ceramic (the axis of the support platform 8 coincides with the axes of each quenching coil 3 and is placed on the ground). The support platform 8 is a coaxial cylinder with different diameters, consisting of two cylinders stacked together with their axes aligned. The upper cylinder has a smaller diameter, while the lower cylinder has a larger diameter. The diameter of the upper cylinder is smaller than the diameter of the central hole in the workpiece, with a gap of approximately 2-4 mm. The diameter of the lower cylinder is larger than the diameter of the central hole in the workpiece, approximately 3-6 mm larger. As workpiece 9 passes through the upper cylinder, it falls and rests on the upper surface of the lower cylinder. Then, the robotic arm retracts along the same path, leaving the heating area of ​​each quenching unit, awaiting the heating of workpiece 9.

[0032] The high-frequency alternating power supply is manually switched on, and the high-frequency alternating current simultaneously powers the three quenching units. Because the frequency and phase of the current are the same, the three quenching units form a three-dimensional heating environment, thus providing more comprehensive quenching of the tooth root and tooth tip of workpiece 9, effectively shortening the quenching time and improving the quenching effect. After quenching, a suction cup-type robotic arm removes the workpiece by passing it vertically from top to bottom through the quenching coils 3 of the upper and middle quenching units.

[0033] Example 2: See Figure 3 and Figure 4 A gear quenching three-dimensional heating device is described. In the heating device of Embodiment 1, the inner diameter of the quenching coil 3 of the upper quenching unit is 800~810mm, and the inner diameter of the quenching coil 3 of the middle quenching unit is 820mm. Since the workpiece is passed vertically from top to bottom by a robot arm through the quenching coils 3 of the upper and middle quenching units, without passing through the quenching coil 3 of the lower quenching unit, and placed on the support platform 8, the tooth tip circle diameter of the workpiece must be less than or equal to that of the upper quenching unit in Embodiment 1. The inner diameter of the quenching coil 3 is crucial; otherwise, the quenching coil 3 of the upper quenching unit will interfere with the vertical movement path of the workpiece. For the above reasons, the quenching coil 3 of the upper quenching unit cannot be made too small. Assuming that the inner diameter of the quenching coil 3 of the lower quenching unit is 780mm, which can provide a good heating effect on the tooth root of the workpiece, the inner diameter of the quenching coil 3 of the upper quenching unit cannot reach 780mm. This further results in the distance between the quenching coil 3 of the upper quenching unit and the tooth root of the workpiece still being too large, leading to an unsatisfactory quenching effect.

[0034] To address the aforementioned issues, in this embodiment, the mounting columns of the upper quenching unit and the middle quenching unit are designed as a rotating structure. This maintains a fixed connection between the middle and lower quenching units, which are then integrated with the support frame 1 and placed on the ground.

[0035] This rotary structure prevents interference between the quenching coil 3 of the upper quenching unit and the workpiece when the robot places or removes a workpiece from the support table 8. See [link / reference needed]. Figure 4 Specifically, it includes the following structures: A first cavity is formed in the upper quenching unit mounting column 2, and a second cavity is formed in the middle quenching unit mounting column 2. The upper quenching unit mounting column 2 is rotatably connected to the middle quenching unit mounting column via a bearing 10. A servo motor 11 for driving the upper quenching unit mounting column to rotate is installed in the second cavity. The servo motor 11 has a power-off locking function. A gear ring 12 is installed on the inner wall of the first cavity. The inner ring of the gear ring 12 has teeth. The axis of the gear ring coincides with the axis of the upper quenching unit mounting column. A drive gear that meshes with the gear ring 12 is installed on the rotating shaft of the servo motor 11. Through the meshing relationship between the drive gear and the gear ring 12, the servo motor drives the upper quenching unit mounting column to rotate relative to the middle quenching unit mounting column. The axis of the rotating shaft is the axis of the upper quenching unit mounting column.

[0036] The servo motor and the aforementioned robotic arm are operated by different control signals from the same controller. Specifically, when the controller sends a signal to the robotic arm to place or remove a workpiece from the support platform 8, the controller sends a rotation signal to the servo motor, causing the mounting column of the upper quenching unit to rotate counterclockwise by 90 degrees (since the high-frequency alternating cable has a 15-30cm movement margin, the rotation does not interfere with it), ensuring that the area enclosed by the coils of the upper quenching unit does not overlap with the vertical movement path of the workpiece; in non-the above two operating conditions (i.e., after the workpiece is placed and enters the quenching stage)... When the upper quenching unit is in operation, the controller controls the servo motor to rotate the mounting column of the upper quenching unit 90 degrees clockwise, allowing the quenching coil of the upper quenching unit to reach the heating position. At this time, the axis of the quenching coil of the upper quenching unit coincides with the axis of the coils of the middle and lower quenching units (the servo motor is a high-precision control component, and the angle error after rotation is ≤±0.5°, thus ensuring that the quenching coil of the upper quenching unit coincides with the axis of the coils of the middle and lower quenching units). The quenching coil of the upper quenching unit is located at the preset heating position above the upper end plane of the workpiece, and the controller automatically controls all quenching units to quench simultaneously. Figure 3 In this embodiment, to avoid interference from the support platform 8 with the rotation of the quenching coil of the upper quenching unit, the upper end of the support platform 8 is designed to be lower than the horizontal plane where the quenching coil of the upper quenching unit is located. In this embodiment, the inner diameter of the quenching coil of the upper quenching unit is 780mm, which is closer to the tooth root of the workpiece, thus the quenching effect on the tooth root is better than in Embodiment 1. The structure of the parts not mentioned in this embodiment is the same as in Embodiment 1.

[0037] Example 3: A three-dimensional heating method for gear quenching, comprising the following steps: S1: Construct a three-dimensional heating device for gear quenching; S2: When the user issues a quenching command to the controller, the controller controls the heating device to automatically perform the quenching operation; S3: The controller controls the servo motor to rotate 90° counterclockwise, so that the quenching coil of the upper quenching unit is moved to a position that does not obstruct the workpiece from being placed on the support table 8; after the servo motor completes the 90° counterclockwise rotation, it sends a feedback signal. S4: After receiving the feedback signal from the servo motor, the controller controls the robot to place the workpiece on the support platform 8 according to the set path. After placement, the robot automatically resets and stops, and sends a stop signal. S5: When the controller receives the stop signal of the robot, the controller controls the servo motor to rotate 90° clockwise, thereby rotating the quenching coil of the upper quenching unit by 90°. After the servo motor completes the clockwise rotation, a reset completion signal is sent. S6: After the controller receives the servo motor reset completion signal, it controls all the quenching coils of the quenching unit to be energized, the cooling system starts at the same time, and the controller times the heating time T=20s; S7: When the controller detects that the heating time has reached T, it stops the quenching coil from being powered on and shuts down the cooling system. The controller controls the servo motor to rotate 90° counterclockwise. After the servo motor has rotated 90° counterclockwise, it sends a feedback signal. S8: After receiving the feedback signal, the controller controls the robot arm to take away the quenched workpiece along another set path and place it in the placement area for rapid cooling. After that, the robot arm automatically resets and stops, and sends a reset completion signal. S9: After receiving the reset completion signal of the robot arm, the controller controls the servo motor to rotate 90° clockwise. After the servo motor rotates 90° clockwise, it sends a signal that the quenching of a single workpiece is complete, thus completing the quenching of one workpiece. The controller counts the number of quenched workpieces. S10: After the controller receives the signal that the quenching of a single workpiece is complete, repeat S3-S9 to achieve continuous automatic quenching of K workpieces. When the number of quenched workpieces counted by the controller reaches K, the controller automatically stops the quenching operation, waits for reloading, and the user sends the quenching command to the controller again, repeating all the above steps.

[0038] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A three-dimensional heating device for gear quenching, characterized in that, include: There are at least 3 quenching units, which are stacked in sequence. The 3 quenching units are referred to as the upper quenching unit, the middle quenching unit, and the lower quenching unit from top to bottom. The middle quenching unit and the lower quenching unit are fixedly connected, and the upper quenching unit is fixedly connected to the middle quenching unit or rotatedly connected. Each quenching unit includes: Insulated mounting posts; Both conductive terminals are fixedly connected to the mounting post, and the two conductive terminals do not contact each other; high-frequency alternating cables are connected to both conductive terminals. The quenching coil is fixedly connected to two conductive terminals at both ends; the quenching coil is connected and communicated with the coolant circulation component; the plane enclosed by the quenching coil is parallel to the horizontal plane; the diameter of the quenching coil in the middle quenching unit is larger than the diameter of the quenching coil in the upper or lower quenching unit. A quick connector that connects simultaneously to a high-frequency alternating cable on two conductive terminals; A high-frequency alternating power supply, connected to a quick connector, is used to supply high-frequency alternating current to the quenching coil through a high-frequency alternating cable and conductive terminals; The support platform is used to place the workpiece. When the workpiece is placed on the support platform, the end plane of the workpiece is parallel to the horizontal plane. The quenching coil of the upper quenching unit is located above the upper end plane of the workpiece, the quenching coil of the middle quenching unit is sleeved on the workpiece, and the quenching coil of the lower quenching unit is located below the lower end plane of the workpiece. The controller is used to control the power supply of the high-frequency alternating power source.

2. The gear quenching three-dimensional heating device according to claim 1, characterized in that, The height of the support platform is lower than the height of the quenching coil of the upper quenching unit. When the upper quenching unit and the middle quenching unit are rotatably connected, the mounting column of the upper quenching unit and the mounting column of the middle quenching unit are rotatably connected by bearings. The rotating shaft is set vertically. The mounting column of the upper quenching unit and the mounting column of the middle quenching unit are respectively provided with a first cavity and a second cavity. A gear ring is installed on the inner wall of the first cavity. A servo motor for driving the mounting column of the upper quenching unit to rotate is installed in the second cavity. A drive gear is installed on the rotating shaft of the servo motor. The drive gear meshes with the gear ring for transmission.

3. A gear quenching three-dimensional heating device according to claim 1 or 2, characterized in that, Ignoring the difference in the inner diameter of the three quenching coils, the quenching coils of the three quenching units are arranged in a vertical array, and high-frequency alternating current with the same frequency and phase is passed through the three quenching coils.

4. The gear quenching three-dimensional heating device according to claim 2, characterized in that, The inner diameter of the quenching coil in the upper quenching unit is smaller than the tooth tip circle diameter of the workpiece. The inner diameter of the quenching coil in the upper quenching unit is 780mm, and the tooth tip circle diameter of the workpiece is 800mm.

5. A gear quenching three-dimensional heating device according to claim 2, characterized in that, When the upper quenching unit and the middle quenching unit are fixedly connected, the inner diameter of the quenching coil of the upper quenching unit is greater than or equal to the tooth tip circle diameter of the workpiece. The inner diameter of the quenching coil of the upper quenching unit is 800~810mm, and the tooth tip circle diameter of the workpiece is 800mm.

6. The gear quenching three-dimensional heating device according to claim 1, characterized in that, The height difference between two adjacent quenching units is 1.5~2.5cm.

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