A flat extrusion cylinder for large non-ferrous metal processing and a heating control method thereof

Abstract

A kind of flat extrusion cylinder for large non-ferrous metal processing and its heating control method, the flat extrusion cylinder includes outer cylinder, middle cylinder and inner cylinder that are sequentially nested from outside to inside, and the outer cylinder, middle cylinder and inner cylinder are coaxially arranged;A extrusion hole is coaxially arranged at the center of the inner cylinder, the extrusion hole is an elliptical structure, and the ratio of the short axis to the long axis of the extrusion hole is 0.6-0.8;Resistance heating rods are arranged on the middle cylinder and the inner cylinder in the axial direction, respectively, the resistance heating rods extend inward along the two ends of the middle cylinder and the inner cylinder, respectively, and the coaxial resistance heating rods on both sides are separated by insulating material;The flat extrusion cylinder is divided into a die side and an extrusion rod side from the center line, and the die side and the extrusion rod side are respectively provided with temperature detection components.The heating control method includes dividing the flat extrusion cylinder into multiple heating zones along the radial and circumferential directions, and setting independent power controllers connected with the corresponding resistance heating rods;The temperature detection components detect the temperature of each heating zone in real time, and adjust the parameters of the corresponding power controllers according to the temperature data.

Description

Technical Field

[0001] This invention relates to metal extrusion technology, and in particular to a flat extrusion cylinder suitable for large non-ferrous metal extrusion equipment and its heating control method. Background Technology

[0002] With the development of aerospace, high-speed rail, and new energy vehicles, the demand for thin-walled wide-width industrial aluminum profiles is increasing. Flat extrusion cylinders are often chosen as conventional thin-walled wide-width industrial aluminum profiles in these fields because they offer advantages such as shorter production processes and higher product quality in the production of wide-width panels. However, due to their asymmetrical shape, flat extrusion cylinders operate under harsh conditions of high temperature, high pressure, and high friction, resulting in uneven stress distribution, significant wear, and a high susceptibility to cracking at the transition between long and short sides, leading to a shorter service life. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a flat extrusion cylinder for large-scale non-ferrous metal processing and a heating control method thereof, in order to address the above-mentioned deficiencies of the prior art.

[0004] To achieve the above objectives, the present invention provides a flat extrusion cylinder for large-scale non-ferrous metal processing, comprising an outer cylinder, a middle cylinder, and an inner cylinder sequentially nested from the outside in, the outer cylinder, the middle cylinder, and the inner cylinder being coaxially arranged; an extrusion hole is coaxially arranged at the center of the inner cylinder, the extrusion hole having an elliptical structure, and the ratio of the minor axis to the major axis of the extrusion hole being 0.6-0.8; resistance heating rods are respectively arranged axially on the middle cylinder and the inner cylinder, the resistance heating rods extending inward from both ends of the middle cylinder and the inner cylinder along the axial direction of the extrusion hole, and the resistance heating rods on both coaxial sides are separated by an insulating material; the flat extrusion cylinder is divided into a mold side and an extrusion rod side from the center line, and temperature detection components are respectively arranged on the mold side and the extrusion rod side.

[0005] The aforementioned flat extrusion cylinder for large non-ferrous metal processing has an extrusion hole on the die side with a wear allowance of 1-3 mm.

[0006] In the aforementioned flat extrusion cylinder for large-scale non-ferrous metal processing, the ratio of the long axis of the extrusion hole to the outer diameter of the inner cylinder is 0.6-0.8.

[0007] In the aforementioned flat extrusion cylinder for large-scale non-ferrous metal processing, the ratio of the outer diameter of the inner cylinder to the outer diameter of the middle cylinder is 0.35-0.65.

[0008] In the aforementioned flat extrusion cylinder for large-scale non-ferrous metal processing, the ratio of the outer diameter of the middle cylinder to the outer diameter of the outer cylinder is 0.65-0.85.

[0009] The aforementioned flat extrusion cylinder for large-scale non-ferrous metal processing, wherein the inner cylinder and the middle cylinder are in a stepped interference fit, the interference on the extrusion rod side is 0.1-0.05 mm lower than that on the die side, and the interference on the extrusion rod side is 1‰-3‰.

[0010] The aforementioned flat extrusion cylinder for large-scale non-ferrous metal processing, wherein the middle cylinder and the outer cylinder are interference fit.

[0011] To better achieve the above objectives, the present invention also provides a heating control method for a flat extrusion cylinder used in large-scale non-ferrous metal processing, comprising the following steps:

[0012] The flat extrusion cylinder is divided into multiple heating zones along the radial and circumferential directions. Each heating zone is equipped with an independent power controller, which is connected to the corresponding resistance heating rod to achieve independent temperature control of each zone.

[0013] Each heating zone is equipped with a temperature detection component to monitor the temperature of each heating zone in real time and transmit the temperature data to the host computer.

[0014] The host computer adjusts the corresponding power controller parameters based on the temperature data to achieve precise control of the flat extrusion cylinder temperature.

[0015] The above-mentioned heating control method for flat extrusion cylinders used in large non-ferrous metal processing includes a temperature detection component that is a thermocouple. The thermocouple passes through the outer cylinder and the middle cylinder and is installed on the outer wall of the inner cylinder. The temperature signal collected by the thermocouple is transmitted to a paperless recorder. The paperless recorder analyzes and obtains the real-time temperature, displays it on the recorder interface, and transmits the real-time temperature to the PLC analog input module of the host computer.

[0016] The heating control method for the flat extrusion cylinder used in large non-ferrous metal processing described above involves controlling the temperature of each heating zone according to the stress condition of the flat extrusion cylinder, and the temperature difference between each heating zone is ≤50℃.

[0017] The technical advantages of this invention are as follows:

[0018] The flat extrusion cylinder of this invention can effectively increase the number of extrusion cycles. An elliptical extrusion hole is provided inside the inner cylinder, and the inner lining of the inner cylinder is an ellipse with a minor axis to major axis ratio of 0.6-0.8. This mitigates the stress concentration phenomenon caused by the transition from a circular arc to a horizontal line in the flat extrusion cylinder. Wear allowance is provided on the die side of the inner cylinder's inner bore, reducing cylinder wear, increasing the number of extrusion cycles, and extending cylinder life. The inner cylinder and middle cylinder adopt a stepped interference fit, with a larger interference fit on the extrusion rod side and a smaller interference fit on the die side. Due to the uneven stress distribution within the cylinder, the extrusion rod side experiences greater stress, which helps prevent cylinder breakage. This invention increases the prestress between the inner cylinder and the middle cylinder on the side of the extrusion rod, making the axial force on the flat extrusion cylinder uniform. Simultaneously, the flat extrusion cylinder of this invention employs a zoned heating method, dividing the flat extrusion cylinder into several heating zones. The temperature of each heating zone can be adjusted according to the stress state of the flat extrusion cylinder, controlling the stress balance. Setting the initial heating temperature gradient of the flat extrusion cylinder can effectively eliminate residual stress after processing. Furthermore, controlling the heating temperature prevents the flat extrusion cylinder from cracking due to excessive temperature differences, solving the problem of cracking caused by uneven stress distribution and excessive wear in existing flat extrusion cylinders.

[0019] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a flat extrusion cylinder structure according to an embodiment of the present invention;

[0021] Figure 2 for Figure 1 CC section view;

[0022] Figure 3 This is a side heating partition diagram of a flat extrusion cylinder mold according to an embodiment of the present invention;

[0023] Figure 4 This is a diagram showing the heating zone on the side of the extrusion rod of a flat extrusion cylinder according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of an existing flat extrusion cylinder structure;

[0025] Figure 6 The diagram shows the stress distribution along the cross-section of the inner liner during operation of an existing flat extrusion cylinder and the flat extrusion cylinder of the present invention.

[0026] Figure 7 This is a schematic diagram illustrating the heating working principle of an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the heating control principle according to an embodiment of the present invention;

[0028] Figure 9This is a schematic diagram of the heating control principle of the heating zone according to an embodiment of the present invention.

[0029] Among them, the attached reference numerals

[0030] 1 outer cylinder

[0031] 2 medium tubes

[0032] 3 Inner Tubes

[0033] 4 extrusion holes

[0034] 5 resistance heating rods

[0035] 6 thermocouples

[0036] 7 Insulation materials

[0037] 8 host computers

[0038] 9 Power Controller

[0039] 10 Paperless Recorders

[0040] A Extrusion Rod Side

[0041] B mold side

[0042] Z1-Z12 heating zone Detailed Implementation

[0043] The structural and working principles of the present invention will be described in detail below with reference to the accompanying drawings:

[0044] See Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of a flat extrusion cylinder structure according to an embodiment of the present invention. Figure 2 for Figure 1 A CC cross-sectional view. The flat extrusion cylinder of the present invention for large-scale non-ferrous metal processing includes an outer cylinder 1, a middle cylinder 2, and an inner cylinder 3 sequentially nested from the outside in. The outer cylinder 1, middle cylinder 2, and inner cylinder 3 are coaxially arranged. An extrusion hole 4 is coaxially arranged at the center of the inner cylinder 3. The extrusion hole 4 has an elliptical structure, and the ratio of its minor axis to its major axis is 0.6-0.8. Resistance heating rods 5 are respectively arranged axially on the middle cylinder 2 and the inner cylinder 3. The resistance heating rods 5 extend inward from both ends of the middle cylinder 2 and the inner cylinder 3 along the axial direction of the extrusion hole 4, and the coaxial resistance heating rods 5 are separated by an insulating material 7, i.e., they are in a separated state in the middle. The flat extrusion cylinder is divided into a mold side B and an extrusion rod side A from the center line. Temperature detection components are respectively arranged on the mold side B and the extrusion rod side A.

[0045] The extrusion hole 4 on the mold side B is provided with a wear allowance of 1-3mm. When the difference between the long axis and short axis of the inner hole of the mold side B and the extrusion rod side A is less than 1mm, the allowance is too small and it is difficult to significantly reduce wear. When the difference between the long axis and short axis of the inner hole of the mold side B and the extrusion rod side A is greater than 3mm, the inner hole of the mold side B is too small, which may lead to an excessively large gap between the extrusion pad and the inner hole of the extrusion rod side A, resulting in poor sealing. The ratio of the major axis of the extrusion hole 4 to the outer diameter of the inner cylinder 3 is preferably 0.6-0.8. This ratio can mitigate the stress concentration phenomenon caused by the transition from a circular arc to a horizontal line. When the ratio is less than 0.6, the maximum stress of the extrusion cylinder will exceed the maximum stress value of a traditional flat extrusion cylinder. When the ratio is greater than 0.8, the inner lining of the extrusion cylinder is closer to a circular extrusion cylinder. Although the stress is reduced and the distribution is more uniform, the extrusion pressure required for billet extrusion will increase sharply. The ratio of the outer diameter of the inner cylinder 3 to the outer diameter of the middle cylinder 2 is preferably 0.35-0.65. The ratio of the outer diameter of the middle cylinder 2 to the outer diameter of the outer cylinder 1 is preferably 0.65-0.85. The inner cylinder 3 and the middle cylinder 2 are stepped interference fits. The interference of the extrusion rod side A is 0.1-0.05 mm lower than that of the die side B. The interference of the extrusion rod side A is preferably controlled at 1‰-3‰. The middle cylinder 2 and the outer cylinder 1 are integrally interference fits, using a hot-fitting method. The inner cylinder 3, middle cylinder 2, and outer cylinder 1 are all made of hot-work die steel.

[0046] See Figure 3 and Figure 4 , Figure 3 This is a diagram of the heating zone B on the side of a flat extrusion cylinder mold according to an embodiment of the present invention. Figure 4 This is a heating zone diagram of the extrusion rod side A of a flat extrusion cylinder according to an embodiment of the present invention. In this embodiment, the mold side B is divided into six heating zones along the circumference: the first heating zone, the second heating zone, the third heating zone, the fourth heating zone, the fifth heating zone, and the sixth heating zone, denoted as heating zones Z1, Z2, Z3, Z4, Z5, and Z6, respectively. The extrusion rod side A is also divided into six heating zones: the seventh heating zone, the eighth heating zone, the ninth heating zone, the tenth heating zone, the eleventh heating zone, and the twelfth heating zone, denoted as heating zones Z7, Z8, Z9, Z10, Z11, and Z12, respectively. Based on the stress condition of the flat extrusion cylinder, the resistance heating tubes near the elliptical side are arranged in an approximately elliptical arc shape to make the temperature heating more uniform.

[0047] See Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of the existing flat extrusion cylinder liner structure. Figure 6The figure shows the stress distribution along the cross-section of the inner liner of the existing flat extrusion cylinder and the flat extrusion cylinder of the present invention during operation. As shown in the figure, compared with the existing flat extrusion cylinder, the present invention can make the working stress of the extrusion cylinder more uniformly distributed along the inner hole edge, and leave a wear allowance on the inner wall of the extrusion hole 4 on the die side, increasing the number of extrusion cycles and effectively extending the life of the extrusion cylinder.

[0048] See Figure 7 , Figure 7 This is a schematic diagram illustrating the heating principle of an embodiment of the present invention. The flat extrusion cylinder heating device of the present invention includes a resistance heating rod 5, a thermocouple 6, a paperless recorder 10, a PLC, a power controller 9, etc. The resistance heating rod 5 is disposed between the inner cylinder 3 and the middle cylinder 2 of the flat extrusion cylinder. In the inner cylinder 3, it is mainly disposed along the major axis of the inner ellipse. Since the minor axis is closer to the outer circle of the inner cylinder 3, no resistance heating rod 5 is disposed there; its heating is mainly achieved through heat transfer between the middle cylinder 2 and the major axis region. The major axis region referred to in this invention is the area enclosed by the major axis and the corresponding outer arc. Each heating zone has a temperature detection component, a thermocouple 6, which can adjust the temperature of each heating zone in real time. Figure 7 The diagram shows the connection configuration of the components when the heating zone is divided into 12 zones. Each heating zone is equipped with an independent power controller 9 (model KTY1S series, withstand voltage 400V), powered by a single-phase 380V power supply, enabling independent temperature control for each zone. Each heating zone is equipped with a K-type armored thermocouple 66 (measuring range 0-600℃, accuracy ±1.5℃), threaded onto the outer wall of the inner cylinder 3. The temperature signal is connected to the paperless recorder 10 via shielded twisted-pair cable. The paperless recorder 10 analyzes the real-time temperature and displays it on the recorder interface, while simultaneously transmitting the temperature data to the PLC analog input module of the host computer 8. The host computer 8 uses a temperature control algorithm to adjust the parameters of the power controller 9 based on the collected temperature data, thereby achieving precise temperature control of the extrusion cylinder.

[0049] See Figure 8 and Figure 9 , Figure 8 This is a schematic diagram of the heating control principle according to an embodiment of the present invention. Figure 9 This is a schematic diagram illustrating the heating control principle of the heating zone according to an embodiment of the present invention. The heating control method for a flat extrusion cylinder used in large non-ferrous metal processing according to the present invention includes the following steps:

[0050] The flat extrusion cylinder is divided into multiple heating zones along the radial and circumferential directions, preferably 8-16 zones. Each heating zone is equipped with an independent power controller 9, which is connected to a corresponding resistance heating rod 5 to achieve independent temperature control of each zone. The resistance heating rods 5 in the long axis region are arranged in an approximately elliptical inner hole shape near the long axis. Each heating zone is equipped with a temperature detection component to detect the temperature of each heating zone in real time and transmit the temperature data to the host computer 8. The host computer 8 adjusts the corresponding power controller 9 parameters according to the temperature data to achieve precise temperature control of the flat extrusion cylinder.

[0051] In this embodiment, the temperature detection component is a thermocouple 6. The thermocouple 6 passes through the outer cylinder 1 and the middle cylinder 2 and is installed on the outer wall of the inner cylinder 3, simultaneously detecting the temperatures of the middle cylinder 2 and the inner cylinder 3. The temperature signal collected by the thermocouple 6 is transmitted to the paperless recorder 10. The paperless recorder 10 analyzes and displays the real-time temperature on the recorder interface, and transmits the real-time temperature to the PLC analog input module of the host computer 8. The temperature of each heating zone is controlled according to the force applied to the flat extrusion cylinder, and the temperature difference between each heating zone is ≤50℃.

[0052] See Figure 8 When heating to the target temperature for the first time, gradient heating is required, with increments of 50-70℃. Once the flat extrusion cylinder reaches one gradient, maintain the temperature for 30-60 minutes to ensure the removal of residual stress inside the newly processed flat extrusion cylinder. When starting heating, it is necessary to check whether the maximum temperature has been exceeded, whether the heater is malfunctioning, and whether the temperature difference is too large. If any of these checks are positive, heating should be stopped. If all checks are negative, heating can begin. During the heating process, the temperature difference between each heating zone must not exceed 50℃. If it exceeds 50℃, heating must be stopped immediately; otherwise, excessive temperature differences will cause uneven heating of the flat extrusion cylinder, leading to cylinder breakage.

[0053] In this embodiment, the temperature of each heating zone can be controlled differently according to the stress condition of the flat extrusion cylinder, but the temperature difference should not exceed 30°C. For example, during the extrusion process, when the "upsetting" stage has ended and the "extrusion" stage has begun, the temperature of the heating zone on the die side B can be controlled to be 10-20°C higher than the temperature on the extrusion rod side A. This is because at this time, the billet in the extrusion cylinder is mainly concentrated on the die side B, and the "breakthrough" stage has begun. It is necessary to increase the temperature to reduce the deformation resistance of the billet. Meanwhile, the inner cylinder 3 on the extrusion rod side A has little or no billet, so the temperature can be appropriately reduced to increase the yield strength of the extrusion cylinder and prevent cracking.

[0054] See Figure 9During the initial heating, gradient heating is required. For every 50°C increase, a 30-minute holding period is necessary until the target temperature is reached. The target temperature for all twelve heating zones must remain consistent at 450°C to remove residual stress from the flat extrusion cylinder processing. When heating the flat extrusion cylinder during production, after setting the target temperature, it must be ensured that the temperature difference between each heating zone does not exceed 50°C during the heating process. Specifically, it must first determine if the temperature of the zone is within the control range. If not, the power controller 9 does not operate; if yes, the power controller 9 operates until the holding temperature is reached, and the zone enters the holding state. It then continues to determine if this is the final holding state. If yes, the temperature is set to the target temperature and the holding period continues until the end; otherwise, gradient heating and holding begins. Once all heating zones have entered gradient heating and holding, a holding countdown begins. After the countdown ends, the next target temperature is set to the holding temperature + gradient temperature, and heating begins at the next gradient temperature.

[0055] When the flat extrusion cylinder is performing extrusion work, when the "upsetting-filling" process ends and the "die extrusion breakthrough" process begins, the temperature of the six heating zones on side A of the extrusion rod should be appropriately reduced to 10°C lower than the temperature of heating zone B on the die side. At this time, there is very little material in the extrusion cylinder on side A of the extrusion rod, so reducing the temperature will not affect the extrusion process. Furthermore, as the extrusion rod advances, the extrusion pressure on the rear extrusion cylinder decreases sharply. When the temperature is reduced at this time, due to the effect of thermal expansion and contraction, the interference fit between the cylinders is reduced, reducing unnecessary prestress and extending the service life of the flat extrusion cylinder.

[0056] This invention effectively reduces the uneven stress distribution during the extrusion of a flat extrusion cylinder, solving the problem of cracking caused by uneven stress distribution and excessive wear in existing flat extrusion cylinders. An elliptical extrusion hole 4 is provided inside the inner cylinder 3. Since the inner liner of the inner cylinder 3 is elliptical (the ratio of the minor axis to the major axis of this ellipse is 0.6-0.8), it can alleviate the stress concentration phenomenon caused by the transition from a circular arc to a horizontal line in traditional flat extrusion cylinders. A wear allowance is provided on the inner die side B of the inner cylinder 3. Although the die side B is not the point of maximum stress inside the cylinder, it experiences the longest loading time; therefore, this wear allowance reduces cylinder wear, increases the number of extrusion cycles, and extends the cylinder's lifespan. The inner cylinder 3 and the middle cylinder 2 adopt a stepped interference fit, which alleviates stress concentration, forms a self-locking mechanism to prevent axial displacement between the bushings of the extrusion cylinder during the extrusion process, and effectively reduces the stress field of the flat cylinder. The interference fit on the extrusion rod side A of the extrusion cylinder is larger, while the interference fit on the die side B is smaller. This is because the stress distribution inside the cylinder is uneven, and the stress on the extrusion rod side A is greater. To prevent the extrusion cylinder from cracking, the prestress between the inner cylinder 3 and the middle cylinder 2 on the extrusion rod side A is increased to make the axial force on the flat extrusion cylinder uniform. A zoned heating device is set to divide the flat extrusion cylinder into several heating zones. The temperature of each heating zone can be adjusted according to the stress state of the flat extrusion cylinder to control the stress balance of the flat extrusion cylinder. The initial heating temperature gradient of the flat extrusion cylinder is set to effectively eliminate the residual stress after the flat extrusion cylinder is processed. The temperature control during heating is also set to prevent the flat extrusion cylinder from cracking due to excessive temperature difference.

[0057] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A flat extrusion cylinder for large-scale non-ferrous metal processing, characterized in that, The device comprises an outer cylinder, a middle cylinder, and an inner cylinder that are sequentially fitted together from the outside in, and the outer cylinder, middle cylinder, and inner cylinder are coaxially arranged. An extrusion hole is coaxially arranged at the center of the inner cylinder. The extrusion hole has an elliptical structure, and the ratio of its minor axis to its major axis is 0.6-0.

8. Resistance heating rods are respectively arranged axially on the middle cylinder and the inner cylinder. The resistance heating rods extend inward from both ends of the middle cylinder and the inner cylinder along the axial direction of the extrusion hole, and the two coaxial resistance heating rods are separated by an insulating material. The flat extrusion cylinder is divided into a mold side and an extrusion rod side from the centerline, and temperature detection components are respectively arranged on the mold side and the extrusion rod side.

2. The flat extrusion cylinder for large-scale non-ferrous metal processing as described in claim 1, characterized in that, The extrusion hole on the mold side is provided with a wear allowance of 1-3mm.

3. The flat extrusion cylinder for large-scale non-ferrous metal processing as described in claim 1, characterized in that, The ratio of the major axis of the extrusion hole to the outer diameter of the inner cylinder is 0.6-0.

8.

4. The flat extrusion cylinder for large-scale non-ferrous metal processing as described in claim 1, characterized in that, The ratio of the outer diameter of the inner cylinder to the outer diameter of the middle cylinder is 0.35-0.

65.

5. The flat extrusion cylinder for large-scale non-ferrous metal processing as described in claim 1, characterized in that, The ratio of the outer diameter of the middle cylinder to the outer diameter of the outer cylinder is 0.65-0.

85.

6. The flat extrusion cylinder for large-scale non-ferrous metal processing as described in claim 1, characterized in that, The inner cylinder and the middle cylinder are in a stepped interference fit. The interference on the extrusion rod side is 0.1-0.05 mm lower than that on the mold side. The interference on the extrusion rod side is 1‰-3‰.

7. The flat extrusion cylinder for large-scale non-ferrous metal processing as described in claim 1, characterized in that, The middle cylinder and the outer cylinder are interference fit.

8. A heating control method for a flat extrusion cylinder used in large-scale non-ferrous metal processing, characterized in that, The steps include the following: The flat extrusion cylinder is divided into multiple heating zones along the radial and circumferential directions. Each heating zone is equipped with an independent power controller, which is connected to the corresponding resistance heating rod to achieve independent temperature control of each zone. Each heating zone is equipped with a temperature detection component to monitor the temperature of each heating zone in real time and transmit the temperature data to the host computer. The host computer adjusts the corresponding power controller parameters based on the temperature data to achieve precise control of the flat extrusion cylinder temperature.

9. The heating control method for a flat extrusion cylinder used in large-scale non-ferrous metal processing as described in claim 8, characterized in that, The temperature detection component is a thermocouple, which passes through the outer cylinder and the middle cylinder and is installed on the outer wall of the inner cylinder. The temperature signal collected by the thermocouple is transmitted to the paperless recorder. The paperless recorder analyzes and obtains the real-time temperature, displays it on the recorder interface, and transmits the real-time temperature to the PLC analog input module of the host computer.

10. The heating control method for a flat extrusion cylinder used in large-scale non-ferrous metal processing as described in claim 8, characterized in that, The temperature of each heating zone is controlled according to the stress condition of the flat extrusion cylinder, and the temperature difference between each heating zone is ≤50℃.

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