A magnesium alloy rod material precise temperature control induction heating device and method

Abstract

This invention discloses a precise temperature-controlled induction heating device for magnesium alloy rods, located at a station between a straightening device and a continuous rod extrusion device. It includes: an initial state detection mechanism for detecting the initial state of the magnesium alloy rod; and an induction heating mechanism for executing the setting parameters of the heating control system to heat the magnesium alloy rod to a target temperature. This invention also discloses a precise temperature-controlled induction heating method for magnesium alloy rods. This invention can automatically center the position of the magnesium alloy rod and automatically detect the rod diameter and running speed, thereby automatically setting the induction heating process for the magnesium alloy rod, achieving precise temperature control, and also achieving stable temperature control during the extrusion process of the magnesium alloy rod, thus improving the quality of the magnesium alloy wire.

Description

Technical Field

[0001] This invention relates to continuous extrusion technology for magnesium alloy materials, and more specifically, to a precise temperature control induction heating device and method for magnesium alloy rods. Background Technology

[0002] Magnesium alloys are known as "green engineering structural materials of the 21st century" due to their advantages such as light weight, high specific strength, good shock absorption, good machinability, good electromagnetic interference resistance, and easy recyclability. They are involved in many fields and have broad application prospects.

[0003] Magnesium alloys have a promising future and are poised to become a hot research area in the international market. With increasingly stringent environmental regulations globally in recent years, energy conservation and emission reduction have become key focuses for manufacturers, and lightweight automotive design is a current research hotspot, providing a vast potential market for magnesium alloy fasteners. Furthermore, with the continuous development of additive manufacturing technology, magnesium alloy additive manufacturing has become a research and development focus for research institutions and 3D printing companies in the past two years, and the demand for high-performance magnesium alloy wires in fields such as biomedicine is strong.

[0004] Magnesium alloy wire serves as a primary connecting product for magnesium alloy structural components, widely used in welding magnesium alloy products such as cylinders, rods, and wide plates, as well as for repair welding of castings and magnesium alloy products. On the other hand, magnesium wire can also be used as a raw material for 3D arc printing, replacing magnesium powder, which currently has a high risk factor, in the field of additive manufacturing, and represents the future development trend of cast magnesium alloy components.

[0005] Continuous extrusion technology (CONFORM) is a relatively new extrusion molding technology. Continuous casting and extrusion technology provides new technical means and development space for the production of non-ferrous metal tubes, rods, profiles, wires, and their composite materials, and is currently widely used in the preparation of aluminum alloy and copper alloy wire products. However, in continuous extrusion tests of high-performance magnesium alloy wires, problems such as extrusion stalling, magnesium alloy wire cracking, and unstable extrusion processes frequently occur, making it difficult to establish stable magnesium alloy wire preparation techniques and processes. Research has found that magnesium alloys, with their special hexagonal close-packed crystal structure, have poor room temperature forming performance, exhibiting good plastic forming performance only when heated to high temperatures. To obtain better extrusion results, it is necessary to perform online heating of the magnesium alloy material before extrusion and precise temperature control of the rheological zone during the extrusion process, keeping it within the set process window temperature, thereby achieving a stable extrusion process and product quality.

[0006] In existing patent applications, such as patent application number 201811406001.0, a 9.5mm diameter wire blank is first heated to 300℃ using online resistance heating, and then the die is gradually heated to 380-420℃ using high-speed extrusion before continuous extrusion. Using this method, the wire blank cannot reach the target temperature before extrusion, resulting in fluctuations in the extrusion process and affecting the quality of the extruded filament. Furthermore, the extrusion production rhythm is affected by temperature, making it difficult to flexibly adjust the production process.

[0007] For example, patent application number 201110072762.9 discloses a continuous extrusion production system and method for fine-grained magnesium alloy sheets and strips, which heats the bar stock and then extrudes it into sheets and strips with wider widths. The bar stock is heated before extrusion using induction heating or resistance heating, with temperature feedback control applied as the bar stock exits the heating furnace to adjust the heating current – ​​a post-processing adjustment method. When the bar stock heating temperature differs significantly from the target temperature, it is impossible to intervene and adjust the current bar stock temperature, leading to unstable extruded product quality. Therefore, this technology is suitable for extruded materials that are not sensitive to temperature.

[0008] For example, patent application number 201710023634.2 proposes a continuous extrusion method for magnesium alloy sheets. This method involves cutting the end faces of segmented rods into bevels, connecting the segments end-to-end, heating the rods using induction heating, and then extruding them into sheets or strips. However, this patented technology cannot accurately control the temperature of the rods and is only suitable for magnesium alloy materials that are not sensitive to temperature.

[0009] The continuous extrusion production of high-performance magnesium alloy wire places high demands on heating and temperature control. Excessively low temperatures lead to frequent stalls and malfunctions in the continuous extrusion unit, while excessively high temperatures result in various quality issues, making continuous production impossible. Currently, the continuous extrusion technology for high-performance magnesium alloy wire is in the research and development stage, lacking mature production equipment and application technologies, and a stable and continuous extrusion production control technology has not yet been established. Therefore, it is necessary to develop online heating and temperature control technology for magnesium alloy rods to enhance their plastic deformation capabilities, thereby facilitating the continuous extrusion production of magnesium alloy wire. Summary of the Invention

[0010] To address the shortcomings of existing technologies, the present invention aims to provide a precise temperature control induction heating device and method for magnesium alloy rods. This device and method can automatically center the position of the magnesium alloy rods and automatically detect the rod diameter and running speed. Based on this, the induction heating process of the magnesium alloy rods can be automatically set to achieve precise temperature control. It can also achieve stable temperature control during the extrusion process of magnesium alloy rods, thereby improving the quality of magnesium alloy wire.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] The first aspect of this invention provides a precision temperature control induction heating device for magnesium alloy rods, disposed at a station between a straightening device and a continuous rod extrusion device, comprising:

[0013] An initial state testing mechanism is used to test the initial state of magnesium alloy bars.

[0014] An induction heating mechanism is used to execute the setting parameters of the heating control system to heat the magnesium alloy rod to the target temperature.

[0015] Preferably, the initial state detection mechanism includes a support, a rod alignment adjustment component, a distance sensor, an initial temperature detection component, a speed detection component, and an intelligent processing module;

[0016] The support is configured as a rectangular frame structure, with its two ends along its length being the inlet end and the outlet end, respectively.

[0017] The rod alignment adjustment assembly is provided in two sets, respectively located at the inlet and outlet ends of the corresponding bracket;

[0018] The distance sensor, the initial temperature detection component, and the speed detection component are sequentially arranged in the direction from the inlet end to the outlet end of the bracket;

[0019] The detection data from the distance sensor, the initial temperature detection component, and the speed detection component are all transmitted to the intelligent processing module.

[0020] Preferably, the bracket is mounted on the rod pretreatment platform;

[0021] The induction heating mechanism is mounted on the induction heating platform; and / or

[0022] The distance sensors are provided in pairs, symmetrically arranged above and below the bracket; and / or

[0023] Preferably, the induction heating mechanism is provided in a single set or in multiple sets sequentially.

[0024] Preferably, the induction heating mechanism includes an induction heating coil, an insulating support plate, and a rod material temperature sensor;

[0025] The insulating support plate consists of two pieces, which are respectively located at the inlet end and the outlet end of the induction heating coil;

[0026] The rod temperature sensor is located at the outlet end of the induction heating coil.

[0027] Preferably, a ceramic protective structure is provided between the induction heating coil and the magnesium alloy rod.

[0028] The second aspect of this invention provides a method for precise temperature control induction heating of magnesium alloy rods, which involves performing the following steps using the precise temperature control induction heating device for magnesium alloy rods provided in the first aspect of this invention:

[0029] S1, the magnesium alloy rod enters the initial state detection mechanism, which detects the initial state of the magnesium alloy rod and sends the results to the intelligent processing module;

[0030] S2, the intelligent processing module calculates the time it takes for the magnesium alloy rod to reach the inlet of the induction heating coil and the power required for heating based on the initial state of the magnesium alloy rod, and sends the calculation to the heating control system.

[0031] S3, the induction heating mechanism executes the setting parameters of the heating control system to heat the magnesium alloy rod to the target temperature;

[0032] S4, the magnesium alloy rod material heated to the target temperature is then extruded into filament by a continuous rod material extrusion device and output, and then wound after cooling.

[0033] Preferably, the initial state of the magnesium alloy rod specifically includes:

[0034] The magnesium alloy rod is centered and positioned using the centering adjustment component.

[0035] The diameter of the magnesium alloy rod is detected by the distance sensor;

[0036] The initial temperature of the magnesium alloy rod is detected by the initial temperature detection component;

[0037] The running speed of the magnesium alloy rod is detected by the speed detection component.

[0038] Preferably, the intelligent processing module calculates the power required for heating as follows:

[0039] Calculate the diameter D of the magnesium alloy rod currently described:

[0040] D = d - d1 - d2 (1)

[0041] In the formula, d is a fixed value set between the distance sensors; d1 is the measured value of the distance sensor above the bracket; d2 is the measured value of the distance sensor below the bracket;

[0042] Calculate the heating power P required to heat the current magnesium alloy bar to the target temperature:

[0043]

[0044] In the formula, ρ is the density of the magnesium alloy rod, in kg / m³.3 C p T represents the specific heat capacity of magnesium alloy rods, expressed in J / (kg*K); a The target heating temperature is set; T0 is the measured value of the initial temperature detection component; V is the running speed of the magnesium alloy rod.

[0045] Preferably, the duration t1 for the induction heating mechanism to perform the heating power P is calculated as follows:

[0046] t1=L1 / V (3)

[0047] In the formula, L1 is the distance between the initial temperature detection component and the inlet end of the induction heating coil, and V is the running speed of the magnesium alloy rod.

[0048] The effective heating time t2 of the induction heating mechanism for the magnesium alloy rod is calculated as follows:

[0049] t2=L2 / V (4)

[0050] In the formula, L2 is the length of the induction heating coil, and V is the running speed of the magnesium alloy rod.

[0051] Preferably, the rod temperature sensor detects the temperature of the magnesium alloy rod and records it as T. t And calculate the temperature rise dT = T t -T0, compared with the set temperature rise rate:

[0052] ΔT1=dT-(T a -T0) (5)

[0053] When ΔT1 = 0, or |ΔT1| is less than the maximum allowable temperature difference T1, it indicates that the temperature of the magnesium alloy rod meets the process requirements and can be extruded into wire by the rod continuous extrusion device.

[0054] If |ΔT1|>T1, it indicates that the temperature of the magnesium alloy rod does not meet the requirements of the continuous extrusion process, and the magnesium alloy rod section can be sheared online.

[0055] Preferably, when multiple sets of the induction heating mechanism are provided, the heating power of each set of the induction heating mechanism is set to P. set =P / n, heating time is t2 / n, the temperature rise of the magnesium alloy rod after each set of induction heating mechanisms is (T a -T0) / n; where n is the number of the induction heating mechanisms, n≥2;

[0056] The temperature sensor of the rod in each group of induction heating mechanisms detects the temperature of the magnesium alloy rod, thereby calculating the temperature rise dT of the magnesium alloy rod as it passes through that group of induction heating mechanisms. n Compared with the set temperature increase range:

[0057] ΔT2=dT n -(T a -T0) / n (6)

[0058] When ΔT2 = 0, and the magnesium alloy rod enters the next set of induction heating mechanisms, the induction heating mechanism executes the set heating power P. set_m The calculation is as follows:

[0059]

[0060] When the magnesium alloy rod passes through the last set of induction heating mechanisms, the temperature sensors in that set detect and record the temperature of the magnesium alloy rod as T. t Calculate the temperature rise of the magnesium alloy rod after passing through all the induction heating mechanisms, dT = T. t -T0, and the set temperature rise range (T) a ΔT1 is obtained by calculating -T0);

[0061] When ΔT1 = 0, or |ΔT1| is less than the maximum allowable temperature difference T1, it indicates that the temperature of the magnesium alloy rod meets the process requirements and can be extruded into wire by the rod continuous extrusion device.

[0062] If |ΔT1|>T1, it indicates that the temperature of the magnesium alloy rod does not meet the requirements of the continuous extrusion process, and the magnesium alloy rod section can be sheared online.

[0063] Preferably, the maximum permissible temperature difference T1 is 1 to 30°C.

[0064] The present invention provides a precise temperature control induction heating device and method for magnesium alloy rods, which has the following advantages:

[0065] Beneficial effects:

[0066] 1) It has an automatic rod centering control device, which can accurately center and adjust the position of magnesium alloy rods with inconsistent diameters along the length direction, thereby achieving stable online induction heating;

[0067] 2) The diameter of the rod can be detected online. When the diameter of the rod changes, the heating power can be adjusted according to the real-time detected diameter of the rod, which is conducive to the precise control of the heating temperature of the rod.

[0068] 3) The heater combination method can be flexibly selected according to process requirements. A single heater or a combination of multiple heaters can be used. The heating rate and temperature curve can be customized, and the temperature control process can be flexibly adjusted. Attached Figure Description

[0069] Figure 1 This is a schematic diagram of the arrangement of the precision temperature control induction heating device for magnesium alloy rods of the present invention;

[0070] Figure 2 This is a three-dimensional schematic diagram of the precision temperature control induction heating device for magnesium alloy rods of the present invention;

[0071] Figure 3 This is a schematic diagram of the initial state detection mechanism in the precision temperature control induction heating device for magnesium alloy rods of the present invention;

[0072] Figure 4 This is a schematic diagram of the induction heating mechanism in the precision temperature control induction heating device for magnesium alloy rods of the present invention;

[0073] Figure 5 This is a three-dimensional schematic diagram of the induction heating mechanism in the magnesium alloy rod precision temperature control induction heating device of the present invention;

[0074] Figure 6 This is a schematic diagram showing multiple sets of induction heating mechanisms in the precision temperature control induction heating device for magnesium alloy rods of the present invention;

[0075] Figure 7 This is a schematic diagram of temperature curves for different combinations of induction heating mechanisms in the precise temperature control induction heating method for magnesium alloy rods of the present invention. Detailed Implementation

[0076] To better understand the above-mentioned technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0077] Combination Figure 1 and Figure 2 As shown, the present invention provides a precision temperature control induction heating device for magnesium alloy rods, which is installed at the station between the straightening device 1 and the continuous extrusion device 2, and includes:

[0078] The initial state detection mechanism 3 is used to detect the initial state of the magnesium alloy rod 4.

[0079] The induction heating mechanism 5 is used to execute the setting parameters of the heating control system and heat the magnesium alloy rod 4 to the target temperature.

[0080] Combination Figure 3As shown, the initial state detection mechanism 3 includes a support 31, a rod alignment adjustment component 32, a distance sensor 33, an initial temperature detection component 34, a speed detection component 35, and an intelligent processing module.

[0081] The support 31 is configured as a rectangular frame structure, with the inlet and outlet ends along its length, respectively.

[0082] Two sets of rod alignment adjustment components 32 are provided, which are respectively installed at the inlet and outlet ends of the corresponding brackets 31.

[0083] Distance sensor 33, initial temperature detection component 34, and speed detection component 35 are sequentially installed on the bracket 31 from the inlet end to the outlet end.

[0084] The detection data from the distance sensor 33, the initial temperature detection component 34, and the speed detection component 35 are all transmitted to the intelligent processing module.

[0085] A pair of distance sensors 33 are provided, symmetrically arranged above and below the bracket 31.

[0086] The bracket 31 is installed on the rod pretreatment platform 6, and the induction heating mechanism 5 is installed on the induction heating platform 7.

[0087] Combination Figures 4 to 6 As shown, there is at least one set of induction heating mechanism 5, or multiple sets arranged in sequence.

[0088] The induction heating mechanism 5 includes an induction heating coil 51, an insulating support plate 52, and a rod material temperature sensor 53.

[0089] Two insulating support plates 52 are provided, which are respectively installed at the inlet end and the outlet end of the induction heating coil 51.

[0090] The rod temperature sensor 53 is installed at the outlet end of the induction heating coil 51.

[0091] A ceramic protective structure 54 is also provided between the induction heating coil 51 and the magnesium alloy rod 4.

[0092] This invention also provides a precise temperature control induction heating method for magnesium alloy rods, wherein the following steps are performed using the precise temperature control induction heating device for magnesium alloy rods of this invention:

[0093] S1, the continuously running magnesium alloy rod 4 enters the initial state detection mechanism 3, which detects the initial state of the magnesium alloy rod 4, including centering, rod diameter detection, rod running speed detection, and rod initial temperature detection, and sends the initial state data to the intelligent processing module.

[0094] S2, the intelligent processing module calculates the current setting parameters of the magnesium alloy rod, calculates the time it takes for the current magnesium alloy rod 4 to run to the induction heating mechanism 5, the heating power of the rod, and other parameters, and sends them to the heating control system.

[0095] S3, the induction heating mechanism 5 executes the settings parameters of the heating control system to heat the magnesium alloy rod 4 to the target temperature. The induction heating mechanism 5 may be a single unit or multiple units. When a single induction heating mechanism 5 is used, the total heating power is output from one heating module to heat the magnesium alloy rod 4 online. When the magnesium alloy rod 4 exits the induction heating mechanism 5, its temperature has reached the target temperature. When multiple induction heating mechanisms 5 are combined, the total heating power can be evenly distributed across multiple heating modules, or segmented heating can be achieved according to process requirements. The heating rate can be flexibly controlled, ultimately heating the magnesium alloy rod 4 to the target temperature.

[0096] S4, the magnesium alloy rod 4 heated to the target temperature is then extruded into filament by the rod continuous extrusion device 2 and output. After being cooled by the cooling device 8, it is then wound by the winding device 9.

[0097] In the aforementioned initial state detection mechanism 3, there are rod centering adjustment components 32 at the inlet and outlet ends of the initial state detection mechanism 3, which can adjust the position of the magnesium alloy rod 4 in the up-down and left-right directions to ensure that the axial direction of the magnesium alloy rod 4 is in the set center position.

[0098] In the aforementioned initial state detection mechanism 3, a pair of distance sensors 33 are installed. The symmetrically distributed distance sensors 33 are used to detect the diameter of the magnesium alloy rod 4 in real time, and the detection results are sent to the intelligent processing module.

[0099] The initial state detection mechanism 3 mentioned above is equipped with a speed detection component 35, which sends the detected speed of the magnesium alloy rod 4 to the intelligent processing module in real time.

[0100] The intelligent processing module calculates the time it takes for the magnesium alloy rod 4 to move to the induction heating coil 51 and the power required for heating, based on information such as the rod diameter, initial temperature, and movement speed detected in the initial state.

[0101] By using the above methods, stable heating and precise temperature control of magnesium alloy rod material 4 can be achieved before extrusion, which is beneficial to the stability of magnesium alloy wire preparation process and quality.

[0102] Example

[0103] See again Figure 1 and Figure 2As shown in the figure, this embodiment discloses a precise temperature control induction heating device and method for magnesium alloy rods, including an initial state detection mechanism 3 and an induction heating mechanism 5 arranged at a station between a straightening device 1 and a continuous rod extrusion device 2. The initial state detection mechanism 3 is mounted on a rod pretreatment platform 6, and the induction heating mechanism 5 is mounted on an induction heating platform 7. The centers of the initial state detection mechanism 3 and the induction heating mechanism 5 are located on a straight line coaxially.

[0104] The initial state detection mechanism 3 includes a support 31, a rod alignment adjustment assembly 32, a distance sensor 33, an initial temperature detection assembly 34, a speed detection assembly 35, and an intelligent processing module. The support 31 is a rectangular frame structure with its two ends along its length being the inlet and outlet ends, respectively. Two sets of rod alignment adjustment assemblies 32 are provided, installed at the corresponding inlet and outlet ends of the support 31. The distance sensor 33, initial temperature detection assembly 34, and speed detection assembly 35 are sequentially installed from the inlet to the outlet end of the support 31. The detection data from the distance sensor 33, initial temperature detection assembly 34, and speed detection assembly 35 are all transmitted to the intelligent processing module. A pair of distance sensors 33 are provided, symmetrically arranged above and below the support 31.

[0105] The rod centering adjustment component 32 is controlled by a hydraulic mechanism, which can adjust the vertical and horizontal positions of the magnesium alloy rod 4, so that the magnesium alloy rod 4 is in the center position during the operation of the initial state detection mechanism 3.

[0106] The induction heating mechanism 5 can be a single unit (e.g., Figure 4 and Figure 5 (as shown), or it can be a combination of multiple groups (such as...) Figure 6 (As shown). Each induction heating mechanism 5 includes an induction heating coil 51, an insulating support plate 52, and a rod temperature sensor 53. Two insulating support plates 52 are provided, installed at the inlet and outlet ends of the induction heating coil 51, respectively. The rod temperature sensor 53 is installed at the outlet end of the induction heating coil 51. To ensure long-term stable operation of the induction heating mechanism 5, a ceramic protective structure 54 is also provided between the induction heating coil 51 and the magnesium alloy rod 4.

[0107] Before heating magnesium alloy rod 4, set the target heating temperature T. a T a The temperature can be selected between 200 and 500℃, depending on the requirements of the bar extrusion process.

[0108] The continuously running magnesium alloy rod 4 is straightened online when passing through the straightening device 1, so that it has good straightness.

[0109] After being straightened, the magnesium alloy rod 4 enters the initial state detection mechanism 3. The rod centering adjustment component 32 clamps and fixes the magnesium alloy rod 4 in position, ensuring its centered position. While the rod centering adjustment component 32 stably clamps the magnesium alloy rod 4, the extension and retraction of the upper and lower telescopic rods remain the same, as do the extension and retraction of the left and right telescopic rods. If the upper and lower extension and retraction are inconsistent, the upper and lower hydraulic mechanisms are adjusted to control the extension and retraction, achieving balance. If the left and right extension and retraction are inconsistent, the same method is used, adjusting the hydraulic mechanisms on both sides to control the extension and retraction, achieving balance.

[0110] During stable operation of the magnesium alloy rod 4, distance sensors 33 are symmetrically distributed above and below the magnesium alloy rod 1. The distance between the distance sensors 33 is set to a fixed value d. The upper distance sensor 33 measures the distance d1 between itself and the upper surface of the magnesium alloy rod 4 in real time, and the lower distance sensor 33 measures the distance d2 between itself and the lower surface of the magnesium alloy rod 4 in real time, and sends the detection results to the intelligent processing unit. The intelligent processing module calculates the current diameter D of the magnesium alloy rod 4.

[0111] D = d - d1 - d2 (1)

[0112] In the formula, d is a fixed value set between the distance sensors 33; d1 is the measured value of the distance sensor 33 above the bracket; and d2 is the measured value of the distance sensor 33 below the bracket.

[0113] The initial temperature detection component 34 detects the initial temperature T0 of the current magnesium alloy rod 4 in real time, and the speed detection component 35 measures the running speed V of the magnesium alloy rod 4. The real-time measured data of the initial temperature and running speed of the rod are sent to the intelligent processing unit. The intelligent processing unit calculates the heating power P required to heat the current magnesium alloy rod 4 to the target temperature.

[0114]

[0115] In the formula, ρ is the density of magnesium alloy rod 4, in kg / m³. 3 C p The specific heat capacity of magnesium alloy rod 4 is expressed in J / (kg*K); T a The target heating temperature is set; T0 is the measured value of the initial temperature detection component 34; V is the running speed of the magnesium alloy rod 4.

[0116] After the magnesium alloy rod 4 completes the initial state detection, it enters the induction heating mechanism 5.

[0117] If the initial temperature measuring point of the magnesium alloy rod 4 is L1 away from the inlet end of the induction heating mechanism 5, then after time t1, the induction heating mechanism will perform heating power P. The time t1 is calculated as follows:

[0118] t1=L1 / V (3)

[0119] In the formula, L1 is the distance between the initial temperature detection component 34 and the inlet end of the induction heating coil 51, and V is the running speed of the magnesium alloy rod 4.

[0120] The induction heating mechanism 5 can be selected in different heating modes according to process requirements. A single induction heating mechanism 5 can be used to heat the magnesium alloy rod 4 to the target temperature. Alternatively, multiple induction heating mechanisms 5 can be combined, and the power of each induction heating mechanism 5 can be adjusted independently.

[0121] During the uniform motion of the magnesium alloy rod 4, when a single induction heating mechanism 5 is used, if the length of the induction heating coil 51 is L2, the effective heating time t2 of the magnesium alloy rod 4 is calculated as follows:

[0122] t2=L2 / V (4)

[0123] In the formula, L2 is the length of the induction heating coil 51, and V is the running speed of the magnesium alloy rod 4.

[0124] The rod temperature sensor 53 detects the temperature of the magnesium alloy rod 4 and records it as T. t And calculate the temperature rise dT = T t -T0, compared with the set temperature rise rate:

[0125] ΔT1=dT-(T a -T0) (5)

[0126] When ΔT1 = 0, or |ΔT1| is less than the maximum allowable temperature difference T1, it indicates that the temperature of the magnesium alloy rod 4 meets the process requirements and can enter the rod continuous extrusion device 2 for extrusion into wire output.

[0127] If |ΔT1|>T1, it means that the temperature of magnesium alloy rod 4 does not meet the requirements of continuous extrusion process, and the magnesium alloy rod 4 section can be sheared online.

[0128] When the induction heating mechanism 5 is arranged in multiple groups, the heating power of each group of induction heating mechanism 5 is set to P. set =P / n, heating time is t2 / n, the temperature rise of magnesium alloy rod 4 after passing through each group of induction heating mechanisms 5 is (T a -T0) / n; where n is the number of induction heating mechanisms 5, n≥2.

[0129] The rod temperature sensor 53 in each induction heating mechanism 5 detects the temperature of the magnesium alloy rod 4, thereby calculating the temperature rise dT of the magnesium alloy rod 4 as it passes through the induction heating mechanism 5. n Compared with the set temperature increase range:

[0130] ΔT2=dT n -(T a -T0) / n (6)

[0131] When ΔT2 = 0, and the magnesium alloy rod 4 enters the next set of induction heating mechanisms 5, the induction heating mechanism 5 executes the set heating power P. set m The calculation is as follows:

[0132]

[0133] When the magnesium alloy rod 4 passes through the last set of induction heating mechanisms 5, the temperature sensors 53 of this set of rods detect the temperature of the magnesium alloy rod 4 and record it as T. t Calculate the temperature rise of the magnesium alloy rod 4 after passing through all the induction heating mechanisms 5, dT = T t -T0, and the set temperature rise range (T) a ΔT1 is obtained by calculating -T0);

[0134] When ΔT1 = 0, or |ΔT1| is less than the maximum allowable temperature difference T1, it indicates that the temperature of the magnesium alloy rod 4 meets the process requirements and can enter the rod continuous extrusion device 2 for extrusion into wire output.

[0135] If |ΔT1|>T1, it means that the temperature of magnesium alloy rod 4 does not meet the requirements of continuous extrusion process, and the magnesium alloy rod section can be sheared online.

[0136] The maximum permissible temperature difference T1 is 1 to 30℃.

[0137] This embodiment describes a precise temperature control induction heating method for magnesium alloy rods, which enables precise temperature control of the magnesium alloy rod 4, ensuring that the magnesium alloy rod 4 stably reaches the target temperature. The magnesium alloy rod 4 enters the continuous extrusion device 2, and the extruded filament is cooled to room temperature by the cooling device 8 and then continuously wound by the winding device 9.

[0138] In this embodiment, a precise temperature-controlled induction heating method for magnesium alloy rods can achieve multiple heating modes. When a single induction heating mechanism is used, the temperature rise curve of the magnesium alloy rod 4 during the heating process is as follows: Figure 7 As shown in (a).

[0139] If five sets of induction heating mechanisms 5 are used to heat the magnesium alloy rod 4, and the power of each set of induction heating mechanisms 5 is set to the same value, the same heating curve of the magnesium alloy rod 4 can be achieved, such as... Figure 7 As shown in (b). Furthermore, for the difficult-to-deform magnesium alloy material 4, more precise heating control is required, and a segmented heating mode can be adopted. Figure 7 (c)~(d)). Figure 7 As shown in (c), the power of each induction heating mechanism 5 can be flexibly customized to achieve accurate control of any customized heating curve. Figure 7 The heating mode shown in (d) is as follows: after heating by a set of induction heating mechanisms 5, the heating is maintained by a set of induction heating mechanisms 5. After reheating and maintaining the heating, the heating is then carried out by the last set of induction heating mechanisms 5 to reach the target temperature, ensuring that the magnesium alloy material 4 reaches the set temperature stably and accurately.

[0140] This embodiment describes a precise temperature control induction heating method for magnesium alloy rods, which can be applied to working conditions where the diameter of the magnesium alloy material 4 is inconsistent. It is suitable for online heating of magnesium alloy material 4 with a diameter varying from 5 to 20 mm. By measuring the diameter of the magnesium alloy material 4 in real time and calculating the heating power required for heating the current magnesium alloy material 4, it ensures that the magnesium alloy material 4 entering continuous extrusion is within a consistent temperature range.

[0141] This embodiment describes a precise temperature control induction heating method for magnesium alloy rods. The induction heating mechanism 5 can be a single set or multiple sets. When multiple sets of induction heating mechanisms 5 are used in combination, the number can be selected from 2 to 7 sets.

[0142] This embodiment describes a precise temperature control induction heating method for magnesium alloy rods, which enables precise heating and temperature control of the magnesium alloy rods before extrusion. This plays a crucial role in improving the stability of the magnesium alloy wire extrusion process and product quality.

[0143] This invention can be applied to the online heating and control of magnesium alloy rods to achieve continuous extrusion preparation of high-performance magnesium alloy wires, which is beneficial to improving the stability of the extrusion process and the quality of the extruded wires, and has good application prospects.

[0144] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.

Claims

1. A precision temperature control induction heating device for magnesium alloy rods, located at a station between a straightening device and a continuous rod extrusion device, characterized in that, include: An initial state testing mechanism is used to test the initial state of magnesium alloy bars. The initial state detection mechanism includes a support frame, a rod alignment adjustment component, a distance sensor, an initial temperature detection component, a speed detection component, and an intelligent processing module; The support is configured as a rectangular frame structure, with its two ends along its length being the inlet end and the outlet end, respectively. The rod alignment adjustment assembly is provided in two sets, respectively located at the inlet and outlet ends of the corresponding bracket; The distance sensor, the initial temperature detection component, and the speed detection component are sequentially arranged in the direction from the inlet end to the outlet end of the bracket; The detection data from the distance sensor, the initial temperature detection component, and the speed detection component are all transmitted to the intelligent processing module. The initial state of the magnesium alloy rod specifically includes: The magnesium alloy rod is centered and positioned using the centering adjustment component. The diameter of the magnesium alloy rod is detected by the distance sensor; The initial temperature of the magnesium alloy rod is detected by the initial temperature detection component; The running speed of the magnesium alloy rod is detected by the speed detection component; The intelligent processing module calculates the time it takes for the magnesium alloy rod to reach the induction heating coil and the required heating power based on the initial state of the magnesium alloy rod, and sends the calculation to the heating control system. An induction heating mechanism is used to execute the setting parameters of the heating control system to heat the magnesium alloy rod to the target temperature.

2. The precision temperature control induction heating device for magnesium alloy rods according to claim 1, characterized in that: The bracket is installed on the rod material pretreatment platform; The induction heating mechanism is mounted on the induction heating platform; and / or The distance sensors are provided in pairs, symmetrically arranged above and below the bracket; and / or The induction heating mechanism may be provided in a single set or in multiple sets sequentially.

3. The precision temperature control induction heating device for magnesium alloy rods according to claim 1, characterized in that: The induction heating mechanism includes an induction heating coil, an insulating support plate, and a rod material temperature sensor; The insulating support plate consists of two pieces, which are respectively located at the inlet end and the outlet end of the induction heating coil; The rod temperature sensor is located at the outlet end of the induction heating coil.

4. The precision temperature control induction heating device for magnesium alloy rods according to claim 3, characterized in that: A ceramic protective structure is provided between the induction heating coil and the magnesium alloy rod.

5. A method for precise temperature control induction heating of magnesium alloy rods, characterized in that, The following steps are performed using the precision temperature control induction heating device for magnesium alloy rods as described in any one of claims 1-4: S1, the magnesium alloy rod enters the initial state detection mechanism, which detects the initial state of the magnesium alloy rod and sends the results to the intelligent processing module; S2, the intelligent processing module calculates the time it takes for the magnesium alloy rod to reach the inlet of the induction heating coil and the power required for heating based on the initial state of the magnesium alloy rod, and sends the calculation to the heating control system. S3, the induction heating mechanism executes the setting parameters of the heating control system to heat the magnesium alloy rod to the target temperature; S4, the magnesium alloy rod material heated to the target temperature is then extruded into filament by a continuous rod material extrusion device and output, and then wound after cooling.

6. The precise temperature control induction heating method for magnesium alloy rods according to claim 5, characterized in that, The intelligent processing module calculates the power required for heating as follows: Calculate the diameter D of the magnesium alloy rod currently described: （1） In the formula, d is a fixed value set between the distance sensors; d1 is the measured value of the distance sensor above the bracket; d2 is the measured value of the distance sensor below the bracket; Calculate the heating power P required to heat the current magnesium alloy bar to the target temperature: （2） In the formula, ρ is the density of the magnesium alloy rod, in kg / m³. 3 C p T represents the specific heat capacity of magnesium alloy rods, expressed in J / (kg*K); a The target heating temperature is set; T0 is the measured value of the initial temperature detection component; V is the running speed of the magnesium alloy rod.

7. The precise temperature control induction heating method for magnesium alloy rods according to claim 6, characterized in that, The duration t1 for which the induction heating mechanism performs the heating power P is calculated as follows: （3） In the formula, L1 is the distance between the initial temperature detection component and the inlet end of the induction heating coil, and V is the running speed of the magnesium alloy rod. The effective heating time t2 of the induction heating mechanism for the magnesium alloy rod is calculated as follows: （4） In the formula, L2 is the length of the induction heating coil, and V is the running speed of the magnesium alloy rod.

8. The precise temperature control induction heating method for magnesium alloy rods according to claim 7, characterized in that, The induction heating mechanism includes an induction heating coil, an insulating support plate, and a rod material temperature sensor; the rod material temperature sensor is located at the outlet end of the induction heating coil. The temperature sensor of the rod material detects the temperature of the magnesium alloy rod material and records it as T. t And calculate the temperature rise dT=T t -T0, compared with the set temperature rise rate: （5） When ΔT1=0, or If the temperature difference is less than the maximum allowable temperature difference T1, it means that the temperature of the magnesium alloy rod meets the process requirements and can be extruded into wire by the continuous rod extrusion device. like If the temperature of the magnesium alloy rod does not meet the requirements of the continuous extrusion process, the section of the magnesium alloy rod can be sheared online.

9. The precise temperature control induction heating method for magnesium alloy rods according to claim 7, characterized in that, The induction heating mechanism includes an induction heating coil, an insulating support plate, and a rod material temperature sensor; the rod material temperature sensor is located at the outlet end of the induction heating coil. When multiple sets of the induction heating mechanism are provided, the heating power of each set of the induction heating mechanism is set to P. set =P / n, heating time is t2 / n, the temperature rise of the magnesium alloy rod after each set of induction heating mechanisms is (T a -T0) / n; where n is the number of the induction heating mechanisms, n≥2; The temperature sensor of the rod in each group of induction heating mechanisms detects the temperature of the magnesium alloy rod, thereby calculating the temperature rise dT of the magnesium alloy rod as it passes through that group of induction heating mechanisms. n Compared with the set temperature increase range: （6） When ΔT2=0, and the magnesium alloy rod enters the next set of induction heating mechanisms, the induction heating mechanism executes the set heating power P. set_m The calculation is as follows: （7） When the magnesium alloy rod passes through the last set of induction heating mechanisms, the temperature sensors in that set detect and record the temperature of the magnesium alloy rod as T. t Calculate the temperature rise of the magnesium alloy rod after passing through all the induction heating mechanisms, dT=T t -T0, and the set temperature rise range (T) a ΔT1 is obtained by calculating -T0); When ΔT1=0, or If the temperature difference is less than the maximum allowable temperature difference T1, it means that the temperature of the magnesium alloy rod meets the process requirements and can be extruded into wire by the continuous rod extrusion device. like If the temperature of the magnesium alloy rod does not meet the requirements of the continuous extrusion process, the section of the magnesium alloy rod can be sheared online.

10. The precise temperature control induction heating method for magnesium alloy rods according to claim 8 or 9, characterized in that: The maximum permissible temperature difference T1 is 1~30℃.

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