A method for measuring temperature of a spray gun heating in a hot spinning process of a metal plate

Abstract

The application discloses a kind of for metal plate hot spinning process spray gun heating temperature measurement method, including the lower surface of metal plate is laid blackbody material;Control metal plate is rotated, and the upper surface of metal plate is heated using spray gun;The corresponding temperature value of the lower surface of metal plate blackbody material is collected;According to the heat conduction and heat convection relationship of metal plate, the heat loss parameter generated by convection heat transfer is calculated;According to metal plate surface temperature calculation model and heat loss parameter, the upper surface and lower surface temperature value of metal plate is calculated.The application can effectively measure the temperature distribution of metal plate in heating process, facilitate to determine reasonable heating time, optimize spray gun arrangement scheme, avoid heating temperature deficiency or local overburning and other problems, improve forming quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of spinning temperature measurement, and particularly relates to a spray gun heating temperature measurement method for a metal plate hot spinning process. BACKGROUND

[0002] With the development of aerospace vehicle structures towards large-scale, integration, lightweight and high strength, large box bottom parts are being converted from the original melon-segment splicing method to integral forming. Spinning forming has obvious advantages for such rotary parts. Spinning process is generally used for processing rotary thin-walled parts. The plate is clamped on the core mold and rotates with the mold at a predetermined speed. The spinning wheel acts on the plate along the predetermined trajectory to make it produce continuous local plastic deformation into various generatrix-shaped rotary hollow thin-walled parts. It is a relatively advanced forming process with the advantages of good metal deformation conditions, high material utilization rate, etc. According to the processing temperature of the spinning part, it is divided into cold spinning and hot spinning. Hot spinning has unique advantages compared to cold forming, which can reduce material work hardening, greatly improve material flow performance, reduce deformation resistance, and improve elongation, etc. Therefore, hot spinning is continuously researched and applied to aerospace structures.

[0003] Spinning temperature is a very important parameter in hot spinning process. For large box bottom parts, a spray gun is usually used for heating, and a non-contact method is used to measure temperature changes. However, due to the uneven brightness of the metal surface and other reasons, the material emissivity is affected, and the infrared thermometer is difficult to accurately measure the temperature, which makes it impossible to judge the heating condition and temperature distribution of the plate during the forming process, which easily causes insufficient heating temperature or uneven heating temperature of the plate, and even local overburning problems, which seriously affects the product forming quality. SUMMARY

[0004] In view of the problem that the temperature of the metal plate is difficult to measure in the hot spinning process in the prior art, the present application provides a spray gun heating temperature measurement method for a metal plate hot spinning process.

[0005] In order to achieve the above-mentioned application purposes, the technical scheme adopted by the present application is as follows:

[0006] A spray gun heating temperature measurement method for a metal plate hot spinning process, comprising the following steps:

[0007] S1, arranging black body material on the lower surface of the metal plate;

[0008] S2, controlling the metal plate to rotate, and heating the upper surface of the metal plate by using a spray gun;

[0009] S3, collecting the corresponding temperature value of the black body material on the lower surface of the metal plate;

[0010] S4, calculate the heat loss parameter generated by convective heat transfer according to the relationship between the heat conduction and the heat convection of the metal plate;

[0011] S5, calculate the temperature values of the upper surface and the lower surface of the metal plate according to the heat loss parameter and the surface temperature calculation model.

[0012] Optionally, the method of arranging black body material on the lower surface of the metal plate in step S1 is:

[0013] Take the center of the lower surface of the metal plate as the center of a circle, and spray a ring-shaped belt with a certain width every certain interval s.

[0014] Optionally, the method of heating the upper surface of the metal plate by using a spray gun in step S2 is:

[0015] According to the size of the plate and the heating temperature, a plurality of groups of spray guns are arranged above the metal plate, each group of spray guns is uniformly distributed along the corresponding ring-shaped belt, and each spray gun heating point is located directly above the corresponding ring-shaped belt on the upper surface of the metal plate.

[0016] Optionally, step S4 specifically includes:

[0017] S41, establish a formula for calculating the temperature increment of the lower surface temperature measurement point according to the heat input of the upper surface heating point of the metal plate;

[0018] S42, establish a temperature increment relationship formula between the lower surface temperature measurement points at the same time according to the formula S41;

[0019] S43, establish a heat loss calculation formula caused by convective heat transfer in different regions of the metal plate, and calculate the heat loss of different temperature measurement points;

[0020] S44, establish a relationship between the transferred heat and the corresponding measured temperature on the lower surface black body material according to the heat input of the heating point and the heat loss caused by the convective heat transfer of the lower surface of the metal plate;

[0021] S45, establish a corresponding relationship between the heat and the temperature increment of different temperature measurement points according to the heat transfer formula;

[0022] S46, solve the relationship formulas established in steps S42 to S45 simultaneously to obtain the heat loss parameter generated by convective heat transfer.S41,

[0023] Optionally, the heat transfer formula used in step S41 is specifically:

[0024]

[0025] wherein, T w is the temperature increment of the lower surface temperature measurement point, Q0 is the input heat, C is the specific heat capacity, p is the density, a is the heat transfer coefficient, t is the heating time, and xi , y i is the coordinate of the temperature measuring point, and x0, y0 are the coordinates of the heating point.

[0026] Optionally, the temperature increment relationship between the temperature measuring points established in step S42 is specifically as follows:

[0027]

[0028] wherein, T w1 is the temperature increment corresponding to the temperature measuring point b1, T wn is the temperature increment corresponding to the temperature measuring point b n , n is the number of temperature measurements, a is the heat transfer coefficient, and t is the heating time.

[0029] Optionally, the heat loss caused by the convection heat transfer of the different regions of the metal plate along the radial direction is linear, and the relationship is specifically as follows:

[0030] Q si = CMT f = CM(kx i +b)

[0031] wherein, Q si is the heat loss caused by the convection of the temperature measuring point b i , C is the specific heat capacity, M is the mass, T f is the temperature value reduced by the heat convection, x i is the abscissa of the temperature measuring point b i , and k and b are the heat loss parameters caused by the convection heat transfer.

[0032] Optionally, the relationship between the heat transferred and the measured temperature on the lower surface of the black body material established in step S44 is specifically as follows:

[0033] Q i -Q si = CM(T i -T0)

[0034] wherein, Q i is the heat transferred from the heating point to the temperature measuring point b i , Q si is the heat loss caused by the convection of the temperature measuring point b i , C is the specific heat capacity, M is the mass, T i is the temperature value of the temperature measuring point b i , and T0 is the room temperature.

[0035] Optionally, the heat and temperature increment relationship established in step S45 is specifically as follows:

[0036] Q i = CMT wi , Qsi = CM(kx i + b)

[0037] Wherein, Q i is the heat transferred from the heating point to the temperature measuring point b i , Q si is the heat loss corresponding to the convection of the temperature measuring point b i , C is the specific heat capacity, M is the mass, T wi is the temperature increment corresponding to the temperature measuring point b i , x i is the abscissa of the temperature measuring point b i , k and b are the heat loss parameters generated by the convection heat transfer.

[0038] Optionally, the metal plate surface temperature calculation model in step S5 is specifically as follows:

[0039]

[0040] Wherein, T x is the temperature value of any point on the lower surface of the metal plate, T x ' is the temperature value of the upper surface corresponding to any point on the lower surface of the metal plate, x is the abscissa of any point on the lower surface of the metal plate, x0 is the abscissa of the heating point, a is the heat transfer coefficient, t is the heating time, T1 is the temperature value of the temperature measuring point b1, x1 is the abscissa of the temperature measuring point b1, k and b are the heat loss parameters generated by the convection heat transfer, and T0 is the room temperature.

[0041] The present application has the following beneficial effects:

[0042] The present application provides a spray gun heating and temperature measuring method for a metal plate hot spinning process, which can effectively measure the temperature distribution of the metal plate during the heating process, facilitate the determination of a reasonable heating time, optimize the spray gun arrangement scheme, avoid problems such as insufficient heating temperature or local overburning, and improve the forming quality. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 is a flowchart of a spray gun heating and temperature measuring method for a metal plate hot spinning process in an embodiment of the present application;

[0044] Figure 2 is a schematic diagram of an annular belt in an embodiment of the present application;

[0045] Figure 3 is a schematic diagram of spray gun heating in an embodiment of the present application;

[0046] Figure 4 is a schematic diagram of the central section of a metal plate in an embodiment of the present application;

[0047] Figure 5The temperature distribution diagram of the upper and lower surfaces of the metal plate in the embodiment of the present application.

[0048] In the figure, 1 is a heating spray gun, 2 is a metal plate, 3 is a spinning core mold, 4 is a lower surface of the plate, 5 is a blackbody material ring belt, and 6 is a plate cross section. DETAILED DESCRIPTION

[0049] The specific embodiments of the present application are described below to facilitate the understanding of the present application by those skilled in the art, but it should be clear that the present application is not limited to the scope of the specific embodiments, and for those skilled in the art, as long as various changes are within the spirit and scope of the present application defined and determined by the appended claims, all the inventions utilizing the concept of the present application are within the scope of protection.

[0050] The research object of the present application is a spherical, ellipsoidal or conical box bottom type part formed by hot spinning of a metal plate, and an acetylene flame spray gun is used for heating. Before spinning, the plate is cut into a circular blank and polished to remove burrs and some surface defects, and then clamped to the spinning machine. The main shaft is rotated to drive the plate to rotate, the spray gun is turned on to heat the plate locally, an infrared thermometer is used to measure the surface temperature of the plate, and when the temperature reaches a certain value, the spinning wheel is started to form the required profile.

[0051] However, for non-ferrous metals such as aluminum alloy and magnesium alloy, the surface emissivity is low, and the brightness of the metal plate surface after polishing is uneven, resulting in large fluctuations in emissivity, and the infrared thermometer cannot effectively measure the temperature. The plate is in a rotating state, and due to the difference in linear speed, the heat loss due to convective heat transfer also differs, resulting in a large difference in plate temperature distribution, making it difficult to effectively evaluate the heating condition, and easily causing problems such as local overburning or insufficient heating temperature. The present application proposes a temperature measurement method to solve these problems, which calculates the temperature distribution of each region of the plate based on heat transfer theory, and provides an effective basis for judging the heating state of the plate and improving the heating scheme.

[0052] As shown in Figure 1 The spray gun heating and temperature measurement method for the hot spinning process of the metal plate provided by the embodiment of the present application comprises the following steps S1 to S5:

[0053] S1, blackbody material is arranged on the lower surface of the metal plate;

[0054] In an optional embodiment of the present application, the method of arranging blackbody material on the lower surface of the metal plate is as follows:

[0055] The center of the lower surface of the metal plate is taken as the center, and a ring belt with a certain width is sprayed every certain interval.

[0056] Specifically, the circular blank is polished, and then a black body material is sprayed on the lower surface of the blank. Figure 2 As shown in the accompanying drawings, the center of the plate is taken as the center of a circle, and a ring-shaped belt with a width of 10 mm is sprayed every 100 mm, so that the plate can be accurately positioned after rotation.

[0057] S2, control the metal plate to rotate, and heat the upper surface of the metal plate by using a spray gun;

[0058] In an optional embodiment of the present application, the method for heating the upper surface of the metal plate by using a spray gun is as follows:

[0059] According to the size of the plate and the heating temperature distribution, a plurality of groups of spray guns are arranged above the metal plate, each group of spray guns is uniformly distributed along a corresponding ring-shaped belt, and each spray gun heating point is located directly above the corresponding ring-shaped belt on the upper surface of the metal plate.

[0060] Specifically, the plate is clamped on the core mold, the spinning machine is turned on to make the plate rotate with the core mold, and the spray gun is ignited to start heating the upper surface of the plate. The spray guns are arranged in groups, and each group of spray guns is uniformly distributed along a certain ring-shaped belt. The number of spray guns in each group is determined according to the need to ensure uniform heating of the ring-shaped belt. The number of spray gun groups can be determined according to the size of the plate and the temperature distribution after heating. The ring-shaped belt b1 is the corresponding ring-shaped belt directly below the position of a group of spray guns, and b2, b3, and the like are adjacent ring-shaped belts.

[0061] S3, collect the corresponding temperature values of the black body material on the lower surface of the metal plate;

[0062] In an optional embodiment of the present application, the infrared temperature measuring gun is used to measure the corresponding temperatures T1, T2, and T3 of the three ring-shaped belts b1, b2, and b3 on the lower surface of the plate every 100 s.

[0063] S4, calculate the heat loss parameters generated by convective heat transfer according to the heat conduction and heat convection relationship of the metal plate;

[0064] In an optional embodiment of the present application, step S4 specifically includes:

[0065] S41, according to the heat input of the heating point on the upper surface of the metal plate, a formula for calculating the temperature increment of the temperature measuring point on the lower surface is established:

[0066]

[0067] Wherein, T w is the temperature increment of the temperature measuring point on the lower surface, Q0 is the input heat, C is the specific heat capacity, p is the density, a is the heat transfer coefficient, t is the heating time, x i , y iHere are the coordinates of the temperature measurement point, and x0 and y0 are the coordinates of the heating point.

[0068] Specifically, the lower surface temperature consists of two parts: a temperature rise caused by heat conduction and a temperature drop caused by heat convection, i.e.:

[0069] T = T w -T f

[0070] Among them, T w The temperature value added for heat conduction, T f This represents the temperature at which thermal convection decreases.

[0071] Select a central section of the part, such as Figure 3 As shown, since the annular belt is heated uniformly, the heating point of the spray gun in the cross-section can be regarded as a point heat source. Heat is transferred through heat conduction. The corresponding temperature increment T from the heat Q0 at the heating point to the temperature measuring points b1, b2, and b3 on the lower surface of the plate is calculated using the heat transfer formula. w1 T w2 and T w3 The relationship.

[0072] S42. Based on the temperature increment relationship between the temperature measuring points on the lower surface at the same moment; specifically:

[0073]

[0074] Among them, T w1 T represents the temperature increment corresponding to temperature measurement point b1. wn Temperature measurement point b n The corresponding temperature increment, where n is the number of temperature measurements, α is the heat transfer coefficient, and τ is the heating time.

[0075] S43. Based on the formula for calculating heat loss caused by convective heat transfer in different areas of the metal sheet, calculate the heat loss at different temperature measurement points; specifically:

[0076] Q si =CMT f =CM(kx i +b)

[0077] Among them, Q si Temperature measurement point b i The corresponding convective heat loss, C is the specific heat capacity, M is the mass, and T is the mass. f x represents the temperature at which heat convection decreases. i Temperature measurement point b i The x-axis represents the heat loss parameters generated by convective heat transfer, where k and b are the parameters on the x-axis.

[0078] S44, according to the heat input of the heating point and the heat loss of the lower surface of the metal plate by convection heat transfer, a relationship between the heat transferred to the lower surface of the black body material and the corresponding measured temperature is established; specifically:

[0079] Q i - si = CM(T i - T0)

[0080] wherein Q i is the heat transferred from the heating point to the temperature measuring point b i , Q si is the corresponding heat loss by convection of the temperature measuring point b i , C is the specific heat capacity, M is the mass, T i is the temperature value of the temperature measuring point b i , and T0 is the room temperature.

[0081] S45, according to the heat transfer formula, a corresponding relationship between the heat and the temperature increment of different temperature measuring points is established; specifically:

[0082] Q i = CMT wi , Q si = CM(kx i +b)

[0083] wherein Q i is the heat transferred from the heating point to the temperature measuring point b i , Q si is the corresponding heat loss by convection of the temperature measuring point b i , C is the specific heat capacity, M is the mass, T wi is the corresponding temperature increment of the temperature measuring point b i , x i is the abscissa of the temperature measuring point b i , and k and b are the heat loss parameters generated by convection heat transfer.

[0084] S46, the relationship established in steps S42 to S45 is solved simultaneously to obtain the heat loss parameters generated by convection heat transfer.

[0085] Specifically, by solving the above relationship simultaneously, the temperature values T f1 , T f2 , T f3 reduced by heat convection and the heat loss parameters k and b generated by convection heat transfer can be obtained.

[0086] S5, according to the surface temperature calculation model of the metal plate and the heat loss parameters, the temperature values of the upper and lower surfaces of the metal plate are calculated.

[0087] In an optional embodiment of the present application, the metal plate surface temperature calculation model in step S5 is specifically:

[0088]

[0089] wherein T x is the temperature value of any point on the lower surface of the metal plate, T x is the temperature value of the corresponding upper surface of any point on the lower surface of the metal plate, x is the horizontal coordinate of any point on the lower surface of the metal plate, x0 is the horizontal coordinate of the heating point, a is the heat transfer coefficient, t is the heating time, T1 is the temperature value of the temperature measuring point b1, x1 is the horizontal coordinate of the temperature measuring point b1, k and b are heat loss parameters generated by convective heat transfer, and T0 is the room temperature.

[0090] The upper surface and lower surface temperature values of any point on the metal plate surface can be calculated by the above metal plate surface temperature calculation model and the heat loss parameters k and b generated by convective heat transfer.

[0091] The following describes a spray gun heating and temperature measuring method for hot spinning process of a metal plate according to a specific example.

[0092] A hot spinning test is performed on a metal plate with a diameter of 800 mm and a thickness of 10 mm in a room temperature environment of 25℃. When heated for 100 s, the temperature distribution of the upper surface of the metal plate is obtained.

[0093] 1. After the circular blank is polished, black body material is sprayed on the lower surface. Taking the center of the plate as the center, a ring-shaped belt with a width of 10 mm is sprayed every 100 mm. After the plate is installed on the core mold and rotated for heating, the spray gun heating point is selected to be directly above the b1 ring-shaped belt at a distance of 200 mm from the center of the plate.

[0094] 2. The ring belt on the lower surface of the plate to which the black body material is sprayed is measured and recorded. As shown in the attached figure, the b1, b2 and b3 positions are selected for temperature measurement, and T1, T2 and T3 are obtained as 85℃, 70℃ and 45℃ respectively. Figure 2

[0095] 3. The temperature difference T w1 , T w2 and T w3 transferred from the upper surface heating point of the plate to the lower surface is calculated by the heat transfer formula (3) as T w1 = 1.11T w2 , T w1 = 1.52T w3 .

[0096] ​4. The relationship in step S4 is brought into, the heat loss parameter k and b can be solved respectively 0.081 and 1.3. The upper surface temperature T1', T2' and T3' are 94.4℃, 87.5℃ and 70.6℃ respectively. The plate upper and lower surface temperature distribution can be obtained by the metal plate surface temperature calculation model as shown in the table. Figure 4

[0097] The present application is described in reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as combinations of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, a special purpose computer, an embedded processor, or other programmable data processing apparatus to produce a machine, so that the instructions, which are executed via the processor of the computer or other programmable data processing apparatus, generate a means for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus with a means for performing the functions specified in one or more flows and / or blocks.

[0098] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to work in a specific manner, so that the instructions stored in the computer readable memory produce a manufacture product including instruction apparatus, which implements the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus with a means for performing the functions specified in one or more flows and / or blocks.

[0099] These computer program instructions can also be loaded into a computer or other programmable data processing apparatus, so that a series of operation steps are performed on the computer or other programmable data processing apparatus to produce a computer implemented process, so that the instructions executed on the computer or other programmable data processing apparatus provide a means for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus with a means for performing the functions specified in one or more flows and / or blocks.

[0100] The principles and implementation methods of the present application are described in the specific embodiments, and the above embodiment description is only used to help understand the method and core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation and application range will be changed, and the above description should not be understood as a limitation of the present application.

[0101] ​Those skilled in the art will appreciate that the embodiments described herein are presented for purposes of illustration and that the inventive principles are not limited to these particular embodiments. Other variations and modifications can be made to the embodiments without departing from the spirit and scope of the inventive principles.

Claims

1. A method for measuring the temperature of a metal plate using a spray gun in a hot spinning process, characterized in that, The method comprises the following steps: S1, arranging blackbody material on the lower surface of the metal plate; S2, controlling the metal plate to rotate and heating the upper surface of the metal plate by using a spray gun; S3, collecting the corresponding temperature value of the blackbody material on the lower surface of the metal plate; S4, calculating the heat loss parameter generated by the convection heat transfer according to the heat conduction and heat convection relationship of the metal plate; S5, calculating the temperature values of the upper and lower surfaces of the metal plate according to the heat loss parameter and the surface temperature calculation model of the metal plate.

2. The method of claim 1, wherein the method is used for a hot spinning process of a metal plate. The method for arranging blackbody material on the lower surface of the metal plate in step S1 is as follows: Taking the center of the lower surface of the metal plate as the center, spraying a ring-shaped belt with a set width at every set interval s.

3. The method of claim 2, wherein the method is used for a hot spinning process of a metal plate, and the method further comprises: determining a temperature of the metal plate based on the temperature of the metal plate at the first position and the temperature of the metal plate at the second position. The method for heating the upper surface of the metal plate by using a spray gun in step S2 is as follows: According to the size of the plate and the heating temperature, a plurality of groups of spray guns are arranged above the metal plate, each group of spray guns is uniformly distributed along the corresponding ring-shaped belt, and each spray gun heating point is located directly above the corresponding ring-shaped belt on the upper surface of the metal plate.

4. The method of claim 1, wherein the method is used for a hot spinning process of a metal plate. Step S4 specifically comprises: S41, establishing a formula for calculating the temperature increment of the lower surface temperature measurement point according to the heat input of the upper surface heating point of the metal plate; S42, establishing a temperature increment relationship formula between the lower surface temperature measurement points at the same time according to the formula in S41; S43, establishing a heat loss calculation formula caused by the convection heat transfer of different regions of the metal plate to calculate the heat loss of different temperature measurement point positions; S44, establishing a relationship formula between the transferred heat and the corresponding measured temperature of the lower surface blackbody material according to the heat input of the heating point and the heat loss caused by the convection heat transfer of the lower surface of the metal plate; S45, establishing a corresponding relationship between the heat and the temperature increment of different temperature measurement points according to the heat transfer formula; S46, solving the relationship formulas established in steps S42 to S45 simultaneously to obtain the heat loss parameter generated by the convection heat transfer.

5. The method of claim 4, wherein the temperature of the metal sheet is measured by a pyrometer. The heat transfer formula used in step S41 is specifically as follows: where T w is the temperature increment of the lower surface temperature measurement point, Q0 is the input heat, C is the specific heat capacity, p is the density, a is the heat transfer coefficient, t is the heating time, x i , y i are the coordinates of the temperature measurement point, and x0, y0 are the coordinates of the heating point.

6. The method of claim 4, wherein the method is used for a hot spinning process of a metal plate, and the method further comprises: determining a temperature of the metal plate based on the temperature of the metal plate measured by the temperature sensor. The temperature increment relationship formula between the temperature measurement points established in step S42 is specifically as follows: Wherein, T w1 is the temperature increment corresponding to the temperature measuring point b1, T wn is the temperature increment corresponding to the temperature measuring point b n , n is the number of temperature measurements, α is the heat transfer coefficient, and τ is the heating time.

7. The method of claim 4, wherein the method is used for a hot spinning process of a metal plate, and the method further comprises: determining a temperature of the metal plate based on the temperature of the metal plate at the first location and the temperature of the metal plate at the second location. The heat loss caused by the convection heat transfer of different regions of the metal plate in step S43 is linear along the radial direction, which is specifically as follows: Q si = CMT f = CM(kx i + b) where Q s i is the temperature at point b i corresponding to the convective heat loss, C is the specific heat capacity, M is the mass, T f is the temperature value reduced by the heat convection, x i is the abscissa of point b i , and k, b are the heat loss parameters generated by convective heat transfer.

8. The method of claim 4, wherein the method is used for a hot spinning process of a metal plate, and the method further comprises: determining a temperature of the metal plate based on the temperature of the metal plate measured by the temperature sensor. The relationship formula between the transferred heat and the measured temperature of the lower surface blackbody material established in step S44 is specifically as follows: Q i -Q si = CM(T i -T0) where Q i is the heat transferred from the heating point to the temperature measuring point b i , Q si is the heat loss by convection at the temperature measuring point b i , C is the specific heat capacity, M is the mass, T i is the temperature value at the temperature measuring point b i , and T0 is the room temperature.

9. The method of claim 4, wherein the method is used for a hot spinning process of a metal plate, and the method further comprises: determining a temperature of the metal plate based on the temperature of the metal plate measured by the temperature sensor. The heat and temperature increment relationship formula established in step S45 is specifically as follows: Q i = CMT wi Q si = CM(kx i + b) where Q i is the heat transferred to the temperature measuring point b i , Q si is the heat loss due to convection at the temperature measuring point b i , C is the specific heat capacity, M is the mass, T wi is the temperature increase at the temperature measuring point b i , x i is the abscissa of the temperature measuring point b i , and k, b are heat loss parameters due to convective heat transfer.

10. A method for heating and measuring the temperature of a spray gun for a hot spinning process of metal sheets according to claim 1, characterized in that, The surface temperature calculation model of the metal plate in step S5 is specifically as follows: wherein T x is the temperature value of an arbitrary point on the lower surface of the metal plate, T x is the temperature value of the upper surface corresponding to the arbitrary point on the lower surface of the metal plate, x is the horizontal coordinate of the arbitrary point on the lower surface of the metal plate, x0 is the horizontal coordinate of the heating point, a is the heat transfer coefficient, t is the heating time, T1 is the temperature value of the temperature measuring point b1, x1 is the horizontal coordinate of the temperature measuring point b1, k and b are heat loss parameters generated by convective heat transfer, and T0 is the room temperature.

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