Die for forging transmission shaft

Abstract

The utility model discloses a die for forging a transmission shaft, belongs to the technical field of transmission shaft forging, and solves the problems that metal fluidity is suddenly reduced, a die cavity is difficult to fill, and insufficient mold filling, folding or cracks are generated because a metal blank is heated to a high temperature and the temperature of the die is too low and the blank is in contact with a cold die to be quickly cooled. Comprising a lower die, an upper die arranged above the lower die and connecting columns fixedly connected to the four internal corners of the top face of the upper die, the connecting columns can be used for being connected with a molding press, heating rod modules for preheating the upper die and the lower die are arranged in the upper die and the lower die, and the heating rod modules are coupled with a die preheating control circuit. The device can detect the temperature of steel, preheats a die if the temperature is high, reduces the temperature difference, avoids the problems of insufficient die filling, folding or cracking and the like caused by the fact that a blank makes contact with a cold die, and ensures the quality of a transmission shaft; if the steel temperature is lower than the threshold value for multiple times, heating is stopped, and waste of energy consumption is avoided.

Description

Technical Field

[0001] This utility model relates to the field of transmission shaft forging technology, and in particular to a mold for forging transmission shafts. Background Technology

[0002] Driveshaft forging is a metal forming process used to manufacture driveshafts, a critical component in automobiles and other machinery. The process involves heating a metal billet to improve its ductility, then forging it using equipment such as a press to shape it into a driveshaft. During forging, the metal's grain structure is optimized, thereby improving the driveshaft's strength and toughness. After forging, the driveshaft undergoes subsequent processes such as heat treatment and machining to achieve precise dimensions and performance requirements. The quality of driveshaft forging directly affects the power transmission efficiency and operational stability of the machinery; therefore, precise process control is crucial.

[0003] During the hot forging process of the drive shaft, the mold needs to be preheated. This is a step to ensure forming quality, mold life and production efficiency. During hot forging, the metal billet is heated to a high temperature. If the mold temperature is too low, the billet will cool down rapidly when it comes into contact with the cold mold, causing the metal fluidity to drop sharply, making it difficult to fill the mold cavity, resulting in insufficient filling, folding or cracking.

[0004] Therefore, a forging die for a drive shaft is proposed to solve or alleviate the above problems. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a mold for forging transmission shafts.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A forging die for a drive shaft includes a lower die, an upper die disposed above the lower die, and connecting columns fixedly connected to the four internal corners of the top surface of the upper die. The connecting columns can be used to connect to a molding press. Both the upper and lower dies are provided with heating rod modules for preheating. The heating rod modules are coupled to a die preheating control circuit. The die preheating control circuit controls the heating rod modules to heat the die to the corresponding temperature when the temperature of the steel entering the die is greater than each threshold. When the temperature of the steel entering the die is repeatedly and continuously lower than the minimum threshold, the heating rod modules are controlled to stop operating.

[0008] Preferably, the mold preheating control circuit includes a power supply and protection module, a steel temperature detection module, a mold temperature detection module, a threshold comparison and logic control module, a mold temperature control and execution module, and a status indication and alarm module;

[0009] The AC input terminal of the power supply and protection module is connected to an external AC220V power supply, and the AC output terminal of the power supply and protection module is powered. The output terminal of the steel temperature detection module is connected to the input terminal of the threshold comparison and logic control module. The output terminal of the mold temperature detection module is connected to the feedback input terminal of the mold temperature control and execution module. The target temperature selection terminal of the threshold comparison and logic control module is connected to the setting input terminal of the mold temperature control and execution module. The heating control terminal of the mold temperature control and execution module is connected to the driving terminal of the heating rod module. The fault signal input terminal of the status indication and alarm module is connected to the lockout output terminal of the threshold comparison and logic control module.

[0010] Preferably, the power supply and protection module includes a rectifier bridge, a fuse, a varistor, and a DC-DC converter LM2596;

[0011] Pins 1 and 3 of the rectifier bridge are connected to the AC 220V live wire and neutral wire via a fuse. Pins 2 and 4 of the rectifier bridge are connected to the input terminal and ground terminal of the DC-DC converter LM2596, respectively. A varistor is connected in parallel between pins 2 and 4 of the rectifier bridge. Pin 1 of the DC-DC converter LM2596 is connected to pin 2 of the rectifier bridge. Pin 2 of the DC-DC converter LM2596 is connected to pin 4 of the rectifier bridge. Pin 3 of the DC-DC converter LM2596 outputs a +5V voltage. Pin 4 of the DC-DC converter LM2596 is grounded through a resistor. A filter capacitor is connected in parallel between pins 3 and 4 of the DC-DC converter LM2596.

[0012] Preferably, the steel temperature detection module includes a K-type thermocouple, an AD8495 thermocouple amplifier, and a calibration potentiometer;

[0013] The positive terminal of the K-type thermocouple is connected to the non-inverting input pin of the AD8495 thermocouple amplifier, and the negative terminal of the K-type thermocouple is connected to the inverting input pin of the AD8495 thermocouple amplifier. The V+ pin of the AD8495 thermocouple amplifier is connected to +5V, the V- pin of the AD8495 thermocouple amplifier is grounded, the output pin of the AD8495 thermocouple amplifier is connected to pin 1 of the calibration potentiometer, pin 2 of the calibration potentiometer is connected to the threshold comparison and the input pin of the logic control module, and pin 3 of the calibration potentiometer is grounded.

[0014] Preferably, the threshold comparison and logic control module includes a voltage comparator LM339N, a multiplexer analog switch CD4051BE, a binary counter CD4020BE, an NOR gate CD4001BE, and an RS flip-flop CD4043BE.

[0015] Pins 7, 1, and 2 of the voltage comparator LM339N are connected to the address terminals A0, A1, and A2 of the multiplexer CD4051BE, respectively. Pin 3 of the multiplexer CD4051BE is connected to the setting input terminal of the mold temperature control and execution module and outputs the target temperature signal. The CLK pin of the binary counter CD4020BE is connected to pin 14 of the voltage comparator LM339N. Pin 9 of the binary counter CD4020BE is connected to pins 1 and 2 of the NOR gate CD4001BE. Pin 3 of the NOR gate CD4001BE is connected to the SET pin of the RS flip-flop CD4043BE. The RST pin of the RS flip-flop CD4043BE is connected to an emergency stop button, and the other end of the emergency stop button is connected to the power setting.

[0016] Preferably, the mold temperature detection module includes a PT100 temperature sensor, a constant current source circuit based on an LM334Z chip, and a differential amplifier LM324;

[0017] The PT100 temperature sensor's detection terminals are located on the upper and lower molds. Pin 1 of the PT100 temperature sensor is connected to the output of a constant current source circuit based on an LM334Z chip. Pin 2 of the PT100 temperature sensor is connected to the non-inverting input of a differential amplifier LM324. The PT100 temperature sensor is also connected to the inverting input of the differential amplifier LM324. The V+ pin of the constant current source circuit based on an LM334Z chip is connected to the power supply and protection module. The SET pin of the constant current source circuit based on an LM334Z chip is grounded. The output pin of the constant current source circuit based on an LM334Z chip outputs a constant current to pin 1 of the PT100 temperature sensor. The output pin of the differential amplifier LM324 outputs the mold temperature signal. The V+ pin of the differential amplifier LM324 is connected to the power supply and protection module. The V- pin of the differential amplifier LM324 is grounded. A gain resistor is connected between pins 5 and 6 of the differential amplifier LM324.

[0018] Preferably, the mold temperature control and execution module includes a hysteresis comparator LM311N, a timer NE555N, a decimal counter CD4017BE, a logic AND gate CD4081BE, an optocoupler MOC3063, and a thyristor BTA41-600B.

[0019] The IN+ pin of the hysteresis comparator LM311N receives the mold temperature signal, the IN- pin of the hysteresis comparator LM311N receives the target temperature signal, the output pin of the hysteresis comparator LM311N is connected to pin 1 of the logic AND gate CD4081BE, the output pin of the timer NE555N is connected to the CLK pin of the decimal counter CD4017BE, the output pin of the logic AND gate CD4081BE is connected to the anode of the optocoupler MOC3063, the cathode of the optocoupler MOC3063 is grounded, pin 6 of the optocoupler MOC3063 is connected to the gate of the thyristor BTA41-600B, pin 4 of the optocoupler MOC3063 is connected to the AC220V neutral line, and the main terminal MT1 of the thyristor BTA41-600B is connected to the AC220V neutral line.

[0020] Preferably, the status indication and alarm module includes a tri-color LED, a buzzer, and a pulse generator NE555N;

[0021] The red cathode of the tri-color LED is connected to the Q pin of the RS flip-flop CD4043BE, the green pin of the tri-color LED is connected to pin 3 of the logic AND gate CD4081BE, the positive terminal of the buzzer is connected to the output pin of the pulse generator NE555N, the negative terminal of the buzzer is grounded, the discharge pin of the pulse generator NE555N is connected to the power supply terminal of the power supply and protection module, and the threshold pin and trigger pin of the pulse generator NE555N are grounded.

[0022] Preferably, the heating rod module includes a heating rod, one end of which is connected to the main terminal MT2 of the SCR BTA41-600B, and the other end of which is connected to the AC220V neutral line.

[0023] This utility model has the following beneficial effects:

[0024] This invention can detect the temperature of steel. If the temperature is high, the mold is preheated to reduce the temperature difference and prevent the billet from contacting the cold mold, which could lead to problems such as insufficient filling, folding, or cracking, thus ensuring the quality of the drive shaft. If the steel temperature is repeatedly lower than the threshold, heating is stopped to avoid wasting energy. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1This is a schematic diagram of the structure of this utility model;

[0027] Figure 2 This is a structural block diagram of the mold preheating control circuit in this utility model.

[0028] In the diagram: 1. Lower mold; 2. Upper mold; 3. Connecting pillar; 4. Power supply and protection module; 5. Steel temperature detection module; 6. Mold temperature detection module; 7. Threshold comparison and logic control module; 8. Mold temperature control and execution module; 9. Status indication and alarm module; 10. Heating rod module. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments 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, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0034] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] A forging die for a drive shaft, such as Figure 1 As shown, it includes a lower mold 1, an upper mold 2 located above the lower mold 1, and connecting posts 3 fixedly connected to the four internal corners of the top surface of the upper mold 2. The connecting posts 3 can be used to connect to a molding press. Both the upper mold 2 and the lower mold 1 are equipped with heating rod modules 10 for preheating. The heating rod modules 10 are coupled to a mold preheating control circuit. When the temperature of the steel entering the mold is greater than each threshold, the mold preheating control circuit controls the heating rod modules 10 to heat the mold to the corresponding temperature. When the temperature of the steel entering the mold is repeatedly and continuously lower than the minimum threshold, the heating rod modules 10 are controlled to stop working.

[0036] like Figure 2 As shown, the mold preheating control circuit includes a power supply and protection module 4, a steel temperature detection module 5, a mold temperature detection module 6, a threshold comparison and logic control module 7, a mold temperature control and execution module 8, and a status indication and alarm module 9. The AC input terminal of the power supply and protection module 4 is connected to an external AC220V power supply, and the AC output terminal of the power supply and protection module 4 is powered. The output terminal of the steel temperature detection module 5 is connected to the input terminal of the threshold comparison and logic control module 7. The output terminal of the mold temperature detection module 6 is connected to the feedback input terminal of the mold temperature control and execution module 8. The target temperature selection terminal of the threshold comparison and logic control module 7 is connected to the setting input terminal of the mold temperature control and execution module 8. The heating control terminal of the mold temperature control and execution module 8 is connected to the driving terminal of the heating rod module 10. The fault signal input terminal of the status indication and alarm module 9 is connected to the lockout output terminal of the threshold comparison and logic control module 7.

[0037] The power supply and protection module 4 includes a rectifier bridge, a fuse, a varistor, and a DC-DC converter LM2596. Pins 1 and 3 of the rectifier bridge are connected to the AC220V live wire and neutral wire through the fuse. Pins 2 and 4 of the rectifier bridge are connected to the input terminal and ground terminal of the DC-DC converter LM2596, respectively. The varistor is connected in parallel between pins 2 and 4 of the rectifier bridge. Pin 1 of the DC-DC converter LM2596 is connected to pin 2 of the rectifier bridge, and pin 2 of the DC-DC converter LM2596 is connected to pin 4 of the rectifier bridge. Pin 3 of the DC-DC converter LM2596 outputs a +5V voltage. Pin 4 of the DC-DC converter LM2596 is grounded through a resistor. A filter capacitor is connected in parallel between pins 3 and 4 of the DC-DC converter LM2596.

[0038] The steel temperature detection module 5 includes a K-type thermocouple, an AD8495 thermocouple amplifier, and a calibration potentiometer. The positive terminal of the K-type thermocouple is connected to the non-inverting input pin of the AD8495 thermocouple amplifier, and the negative terminal of the K-type thermocouple is connected to the inverting input pin of the AD8495 thermocouple amplifier. The V+ pin of the AD8495 thermocouple amplifier is connected to a +5V voltage, the V- pin of the AD8495 thermocouple amplifier is grounded, the output pin of the AD8495 thermocouple amplifier is connected to pin 1 of the calibration potentiometer, pin 2 of the calibration potentiometer is connected to the threshold comparison and the input pin of the logic control module 7, and pin 3 of the calibration potentiometer is grounded.

[0039] The threshold comparison and logic control module 7 includes a voltage comparator LM339N, a multiplexer analog switch CD4051BE, a binary counter CD4020BE, a NOR gate CD4001BE, and an RS flip-flop CD4043BE. Pins 7, 1, and 2 of the voltage comparator LM339N are connected to the address terminals A0, A1, and A2 of the multiplexer analog switch CD4051BE, respectively. Pin 3 of the multiplexer analog switch CD4051BE is connected to the setting input terminal of the mold temperature control and execution module 8 and outputs the target temperature signal. The CLK pin of the binary counter CD4020BE is connected to pin 14 of the voltage comparator LM339N. Pin 9 of the binary counter CD4020BE is connected to pins 1 and 2 of the NOR gate CD4001BE. Pin 3 of the NOR gate CD4001BE is connected to the SET pin of the RS flip-flop CD4043BE. The RST pin of the RS flip-flop CD4043BE is connected to an emergency stop button, and the other end of the emergency stop button is connected to the power setting.

[0040] The mold temperature detection module 6 includes a PT100 temperature sensor, a constant current source circuit based on an LM334Z chip, and a differential amplifier LM324. The detection terminals of the PT100 temperature sensor are located on the upper mold 2 and the lower mold 1. Pin 1 of the PT100 temperature sensor is connected to the output terminal of the constant current source circuit based on the LM334Z chip, pin 2 of the PT100 temperature sensor is connected to the non-inverting input terminal of the differential amplifier LM324, and the PT100 temperature sensor is connected to the inverting input terminal of the differential amplifier LM324. The constant current source circuit based on the LM334Z chip... The V+ pin of the current source circuit is connected to the power supply terminal of the power supply and protection module 4. The SET pin of the constant current source circuit based on the LM334Z chip is grounded. The output pin of the constant current source circuit based on the LM334Z chip outputs a constant current to pin 1 of the PT100 temperature sensor. The output pin of the differential amplifier LM324 outputs the mold temperature signal. The V+ pin of the differential amplifier LM324 is connected to the power supply terminal of the power supply and protection module 4. The V- pin of the differential amplifier LM324 is grounded. A gain resistor is connected between pins 5 and 6 of the differential amplifier LM324.

[0041] The mold temperature control and execution module 8 includes a hysteresis comparator LM311N, a timer NE555N, a decimal counter CD4017BE, a logic AND gate CD4081BE, an optocoupler MOC3063, and a thyristor BTA41-600B. The IN+ pin of the hysteresis comparator LM311N receives the mold temperature signal, the IN- pin of the hysteresis comparator LM311N receives the target temperature signal, and the output pin of the hysteresis comparator LM311N is connected to pin 1 of the logic AND gate CD4081BE. The output pin of the timer NE555N is connected to the CLK pin of the decimal counter CD4017BE. The output pin of the logic AND gate CD4081BE is connected to the anode of the optocoupler MOC3063. The cathode of the optocoupler MOC3063 is grounded. Pin 6 of the optocoupler MOC3063 is connected to the gate of the thyristor BTA41-600B. Pin 4 of the optocoupler MOC3063 is connected to the AC220V neutral line. The main terminal MT1 of the thyristor BTA41-600B is connected to the AC220V neutral line.

[0042] The status indication and alarm module 9 includes a tri-color LED, a buzzer, and a pulse generator NE555N. The red cathode of the tri-color LED is connected to the Q pin of the RS flip-flop CD4043BE, the green pin of the tri-color LED is connected to pin 3 of the logic AND gate CD4081BE, the positive terminal of the buzzer is connected to the output pin of the pulse generator NE555N, the negative terminal of the buzzer is grounded, the discharge pin of the pulse generator NE555N is connected to the power supply terminal of the power supply and protection module 4, and the threshold pin and trigger pin of the pulse generator NE555N are grounded.

[0043] The heating rod module 10 includes a heating rod, one end of which is connected to the main terminal MT2 of the thyristor BTA41-600B, and the other end of which is connected to the AC220V neutral line.

[0044] In practical applications, this invention can detect the temperature of the steel entering the mold in advance. If the temperature of the steel itself is high, the mold needs to be preheated by the mold preheating control circuit to ensure that the temperature difference between the two is small. This prevents the billet from cooling down rapidly when it comes into contact with the cold mold, which would cause a sharp drop in metal fluidity, making it difficult to fill the mold cavity and resulting in insufficient filling, folding, or cracking. This ensures that the quality of the molded drive shaft is acceptable. If the temperature of the steel entering the mold is repeatedly and continuously lower than the minimum threshold, the heating rod module 10 is stopped by the mold preheating control circuit to avoid unnecessary heating of the mold and to avoid wasting energy.

[0045] Specifically, the power supply and protection module 4 converts AC220V AC power into DC power through a rectifier bridge, and outputs a stable voltage to power each module through a DC-DC converter.

[0046] Before the steel is forged into a drive shaft, a K-type thermocouple continuously monitors its surface temperature. After linear amplification by an AD8495 thermocouple amplifier, it outputs a voltage signal proportional to the temperature. This signal is input to the voltage comparator LM339N in the threshold comparison and logic control module 7, where it is compared with a preset threshold voltage. When the steel temperature exceeds a certain threshold, the multi-channel analog switch CD4051BE selects the corresponding target temperature setpoint based on the comparison result and outputs the target temperature signal. Simultaneously, a PT100 temperature sensor is driven by a constant current source. The LM324 differential amplifier converts the actual mold temperature into a feedback voltage, which is the mold temperature signal. The hysteresis comparator LM311N continuously compares the mold temperature signal with the target temperature signal. When the mold temperature is lower than the target value, it outputs a heating enable signal to trigger the timer NE555N and the decimal counter CD4017BE to generate periodic pulses. The logic AND gate CD4081BE controls the optocoupler MOC3063 to drive the thyristor BTA41-600B to conduct, so that the 3kW heating rod is powered on and heated, thereby realizing the preheating of the mold.

[0047] If the steel temperature falls below the minimum threshold for five consecutive times, the decimal counter CD4017BE triggers the RS flip-flop CD4043BE to lock the state through the NOR gate CD4001BE, forcibly shutting off the heating and activating the buzzer alarm. In an emergency, the emergency stop button simultaneously resets the RS flip-flop CD4043BE. At this time, the operator needs to disconnect the AC live wire, while the three-color LED displays the operating status in real time.

[0048] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A die for forging a drive shaft, characterized in that, The mold includes a lower mold (1), an upper mold (2) located above the lower mold (1), and connecting columns (3) fixedly connected to the four inner corners of the top surface of the upper mold (2). The connecting columns (3) can be used to connect to a molding press. Both the upper mold (2) and the lower mold (1) are equipped with heating rod modules (10) for preheating. The heating rod modules (10) are coupled to a mold preheating control circuit. The mold preheating control circuit determines that when the temperature of the steel entering the mold is greater than each threshold, it controls the heating rod modules (10) to heat the mold to the corresponding temperature. When the temperature of the steel entering the mold is lower than the minimum threshold multiple times and continuously, it controls the heating rod modules (10) to stop working.

2. The forging die for a drive shaft according to claim 1, characterized in that, The mold preheating control circuit includes a power supply and protection module (4), a steel temperature detection module (5), a mold temperature detection module (6), a threshold comparison and logic control module (7), a mold temperature control and execution module (8), and a status indication and alarm module (9). The AC input terminal of the power supply and protection module (4) is connected to an external AC220V power supply. The output terminal of the power supply and protection module (4) is powered. The output terminal of the steel temperature detection module (5) is connected to the input terminal of the threshold comparison and logic control module (7). The output terminal of the mold temperature detection module (6) is connected to the feedback input terminal of the mold temperature control and execution module (8). The target temperature selection terminal of the threshold comparison and logic control module (7) is connected to the setting input terminal of the mold temperature control and execution module (8). The heating control terminal of the mold temperature control and execution module (8) is connected to the driving terminal of the heating rod module (10). The fault signal input terminal of the status indication and alarm module (9) is connected to the locking output terminal of the threshold comparison and logic control module (7).

3. The forging die for a drive shaft according to claim 2, characterized in that, The power supply and protection module (4) includes a rectifier bridge, a fuse, a varistor, and a DC-DC converter LM2596; Pins 1 and 3 of the rectifier bridge are connected to the AC 220V live wire and neutral wire via a fuse. Pins 2 and 4 of the rectifier bridge are connected to the input terminal and ground terminal of the DC-DC converter LM2596, respectively. A varistor is connected in parallel between pins 2 and 4 of the rectifier bridge. Pin 1 of the DC-DC converter LM2596 is connected to pin 2 of the rectifier bridge. Pin 2 of the DC-DC converter LM2596 is connected to pin 4 of the rectifier bridge. Pin 3 of the DC-DC converter LM2596 outputs a +5V voltage. Pin 4 of the DC-DC converter LM2596 is grounded through a resistor. A filter capacitor is connected in parallel between pins 3 and 4 of the DC-DC converter LM2596.

4. The forging die for a drive shaft according to claim 2, characterized in that, The steel temperature detection module (5) includes a K-type thermocouple, an AD8495 thermocouple amplifier, and a calibration potentiometer; The positive terminal of the K-type thermocouple is connected to the non-inverting input pin of the AD8495 thermocouple amplifier, the negative terminal of the K-type thermocouple is connected to the inverting input pin of the AD8495 thermocouple amplifier, the V+ pin of the AD8495 thermocouple amplifier is connected to +5V voltage, the V- pin of the AD8495 thermocouple amplifier is grounded, the output pin of the AD8495 thermocouple amplifier is connected to pin 1 of the calibration potentiometer, the pin 2 of the calibration potentiometer is connected to the input pin of the threshold comparison and logic control module (7), and the pin 3 of the calibration potentiometer is grounded.

5. A forging die for a drive shaft according to claim 2, characterized in that, The threshold comparison and logic control module (7) includes a voltage comparator LM339N, a multiplexer analog switch CD4051BE, a binary counter CD4020BE, an NOR gate CD4001BE, and an RS flip-flop CD4043BE. Pins 7, 1, and 2 of the voltage comparator LM339N are connected to the address terminals A0, A1, and A2 of the multiplexer CD4051BE, respectively. Pin 3 of the multiplexer CD4051BE is connected to the setting input terminal of the mold temperature control and execution module (8) and outputs the target temperature signal. The CLK pin of the binary counter CD4020BE is connected to pin 14 of the voltage comparator LM339N. Pin 9 of the binary counter CD4020BE is connected to pins 1 and 2 of the NOR gate CD4001BE. Pin 3 of the NOR gate CD4001BE is connected to the SET pin of the RS flip-flop CD4043BE. The RST pin of the RS flip-flop CD4043BE is connected to an emergency stop button, and the other end of the emergency stop button is connected to the power setting.

6. A forging die for a drive shaft according to claim 2, characterized in that, The mold temperature detection module (6) includes a PT100 temperature sensor, a constant current source circuit based on an LM334Z chip, and a differential amplifier LM324. The detection end of the PT100 temperature sensor is set on the upper mold (2) and the lower mold (1). Pin 1 of the PT100 temperature sensor is connected to the output end of the constant current source circuit based on the LM334Z chip. Pin 2 of the PT100 temperature sensor is connected to the non-inverting input end of the differential amplifier LM324. The PT100 temperature sensor is connected to the inverting input end of the differential amplifier LM324. The V+ pin of the constant current source circuit based on the LM334Z chip is connected to the power supply end of the power supply and protection module (4). The SET pin of the constant current source circuit based on the LM334Z chip is grounded. The output pin of the constant current source circuit based on the LM334Z chip outputs a constant current to pin 1 of the PT100 temperature sensor. The output pin of the differential amplifier LM324 outputs the mold temperature signal. The V+ pin of the differential amplifier LM324 is connected to the power supply end of the power supply and protection module (4). The V- pin of the differential amplifier LM324 is grounded. A gain resistor is connected between pin 5 and pin 6 of the differential amplifier LM324.

7. A forging die for a drive shaft according to claim 2, characterized in that, The mold temperature control and execution module (8) includes a hysteresis comparator LM311N, a timer NE555N, a decimal counter CD4017BE, a logic AND gate CD4081BE, an optocoupler MOC3063, and a thyristor BTA41-600B; The IN+ pin of the hysteresis comparator LM311N receives the mold temperature signal, the IN- pin of the hysteresis comparator LM311N receives the target temperature signal, the output pin of the hysteresis comparator LM311N is connected to pin 1 of the logic AND gate CD4081BE, the output pin of the timer NE555N is connected to the CLK pin of the decimal counter CD4017BE, the output pin of the logic AND gate CD4081BE is connected to the anode of the optocoupler MOC3063, the cathode of the optocoupler MOC3063 is grounded, pin 6 of the optocoupler MOC3063 is connected to the gate of the thyristor BTA41-600B, pin 4 of the optocoupler MOC3063 is connected to the AC220V neutral line, and the main terminal MT1 of the thyristor BTA41-600B is connected to the AC220V neutral line.

8. A forging die for a drive shaft according to claim 2, characterized in that, The status indication and alarm module (9) includes a tri-color LED, a buzzer, and a pulse generator NE555N; The red cathode of the tri-color LED is connected to the Q pin of the RS flip-flop CD4043BE, the green pin of the tri-color LED is connected to pin 3 of the logic AND gate CD4081BE, the positive terminal of the buzzer is connected to the output pin of the pulse generator NE555N, the negative terminal of the buzzer is grounded, the discharge pin of the pulse generator NE555N is connected to the power supply terminal of the power supply and protection module (4), and the threshold pin and trigger pin of the pulse generator NE555N are grounded.

9. A forging die for a drive shaft according to claim 7, characterized in that, The heating rod module (10) includes a heating rod, one end of which is connected to the main terminal MT2 of the thyristor BTA41-600B, and the other end of which is connected to the AC220V neutral line.

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