A spinning forming heating device and a spinning forming temperature measuring method

Abstract

The present invention belongs to the technical field of metal processing, and specifically relates to a spinning forming heating device and a spinning forming temperature measuring method, comprising a heating unit and a heat preservation tube, wherein the heating unit is embedded in a rotating main shaft, the heat preservation tube is sleeved outside the rotating main shaft, and a space for accommodating a blank is reserved between the heat preservation tube and the rotating main shaft, the heat preservation tube comprises an outer tube and an inner tube, the side wall of the outer tube is provided with an opening one for a spinning wheel to extend into, in the axial direction, the parts of the outer tube located at the two ends of the opening one are a retractable structure, the side wall of the inner tube is provided with an opening two for the spinning wheel to extend into, and the spinning wheel can move in the axial direction in the opening two, and the blank is heated by heat conduction, which is beneficial to rapid heating of the blank. After heating, the overall temperature of the blank is relatively more uniform, which is more convenient for actual production and spinning forming experiments, and at the same time, the inner tube and the outer tube form a relatively closed heat preservation structure, which reduces heat diffusion and loss and improves heating efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of metal processing, and in particular relates to a spinning forming heating device and a spinning forming temperature measuring method. Background Art

[0002] Aluminum alloys, magnesium alloys and other difficult-to-deform metals have low plasticity at room temperature and are prone to cracking during the spinning process. At the same time, difficult-to-deform metals need to be formed at high temperatures to achieve smooth spinning. Among them, achieving uniform temperature distribution and controlling the temperature of the blank during the spinning process is a very important technology.

[0003] In the patent with application number 201810018974.0, a self-incremental spinning forming device and method of a sheet material with coordinated self-resistance electric heating are introduced, and the forming device includes: a core mold, a sheet material, a processing tool group, a self-resistance heating tool and a spinning forming device. In this patent, the blank is contacted by an external fixed resistor rod, and the resistor rod is connected to the loop current to heat the blank, which belongs to conduction heating. This patent uses the relative rotation between the blank and the resistor rod to perform local contact heating. This forming method not only causes friction damage between the workpiece and the resistor rod, which is not conducive to the surface quality of the workpiece, but also during the forming process, due to the influence of the strong forming of the spinning wheel, a certain amplitude of jumping will be generated, resulting in discontinuous contact between the resistor rod and the blank with a loop and a short circuit, thereby causing temperature instability. Secondly, since spin forming is a point-by-point forming technology, when the rotation speed of the rotating spindle or the feed speed of the spinning wheel is fast, the contact time per unit area of ​​the resistance rod and the blank is short. The method of local contact heating with the resistance rod cannot quickly meet the requirement of heating the blank to the forming temperature, and it is difficult to ensure the uniformity of the temperature field in the forming area. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a spinning forming heating device and a spinning forming temperature measurement method which are conducive to rapid heating of the blank, more uniform heating of the blank and more accurate temperature measurement.

[0005] The present invention provides a spinning forming heating device, comprising a heating unit and a heat-insulating cylinder, wherein the heating unit is embedded in a rotating spindle, the heat-insulating cylinder is sleeved outside the rotating spindle, and a space for accommodating a blank is reserved between the heat-insulating cylinder and the rotating spindle, the heat-insulating cylinder comprises an outer cylinder and an inner cylinder, the side wall of the outer cylinder is provided with an opening one for a spinning wheel to extend into, in the axial direction, the parts of the outer cylinder located at both ends of the opening one are retractable structures, the side wall of the inner cylinder is provided with an opening two for the spinning wheel to extend into, and the spinning wheel can move in the axial direction in the opening two.

[0006] Furthermore, an air inlet is provided on a side wall at one end of the inner tube, and the air inlet passes through the outer tube and is connected to an external hot air supply device.

[0007] Furthermore, it also includes a spiral groove arranged on the inner wall of the inner tube, and the air inlet is located at the starting end of the spiral groove.

[0008] Furthermore, ribs are arranged inside the inner cylinder, and the ribs are arranged on the inner wall of the inner cylinder in a spiral shape, and the area on the inner wall of the inner cylinder between the ribs forms the spiral groove.

[0009] Furthermore, the ratio of the width of the air inlet along the axial direction of the inner cylinder to the width of the spiral groove is 1:1-2.

[0010] Furthermore, the air inlet is connected to an external hot air supply device through an air inlet pipe, and one end of the air inlet pipe connected to the air inlet is arranged along the tangential direction of the side wall of the inner tube.

[0011] Furthermore, the outer cylinder as a whole is a retractable structure.

[0012] Furthermore, it also includes a contact temperature measuring unit for installation on the blank.

[0013] The present invention also provides a spinning forming temperature measurement method, using the above-mentioned spinning forming heating device, and the spinning forming temperature measurement method comprises the following steps:

[0014] S1. Install the contact temperature measuring unit on the blank;

[0015] S2. Fix the blank with the contact temperature measuring unit installed on the rotating spindle, connect the heating unit to an external power supply, and connect the contact temperature measuring unit to a data recorder, which records the temperature data collected by the contact temperature measuring unit.

[0016] Furthermore, S1 also includes an axial hole at the end of the blank, and two groups of contact temperature measuring units are provided, one group of contact temperature measuring units is installed in the hole to detect the internal temperature of the blank, and the other group of holes is installed at the end of the outer surface of the blank to detect the surface temperature of the blank.

[0017] The beneficial effect of the present invention is that the blank is heated by heat conduction by embedding the heating unit on the rotating spindle, that is, the heat is transferred to the blank mounted on the rotating spindle through the rotating spindle. Since the contact surface between the blank and the rotating spindle when the blank is sleeved on the rotating spindle is surface contact, this heating method belongs to surface contact heating for the blank, which is not only conducive to rapid heating of the blank, but also, compared with the local contact heating method, the overall temperature of the blank after heating is relatively more uniform, which is more convenient for actual production and spinning forming experiments. The setting of the insulation cylinder can reduce the diffusion and loss of the heat of the blank and improve the heating efficiency. Since the areas at both ends of the opening one on the outer cylinder have a retractable structure, the size of the opening one only needs to meet the requirement that the spinning wheel can extend into the blank for processing. When the spinning wheel is in the opening one and moves axially, the opening one can move in the axial direction of the outer cylinder with the spinning wheel, thereby forming a relatively closed cylinder structure, reducing the diffusion and loss of heat and improving the heating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attached Figure 1 It is a schematic diagram of the structure of the spinning forming heating device of the present invention.

[0019] Attached Figure 2 It is a schematic structural diagram of the heat preservation cylinder of the present invention.

[0020] Attached Figure 3 This is a transient distribution diagram of the surface temperature of the blank of an experimental example 1 of the spinning forming heating device of the present invention.

[0021] Attached Figure 4 This is the transient distribution diagram of the blank surface temperature of Experimental Example 2 of the spinning forming heating device of the present invention.

[0022] Attached Figure 5 This is the transient distribution diagram of the blank surface temperature of Experimental Example 3 of the spinning forming heating device of the present invention.

[0023] In the figure, 1-outer cylinder; 11-opening one; 2-inner cylinder; 21-opening two; 22-air inlet; 23-air inlet pipe; 3-ribs; 4-spiral grooves; 5-spinning wheel; 6-rotating spindle; 7-heating unit; 71-collector coil; 72-carbon brush; 8-tail column; 9-data recorder; 10-contact temperature measuring unit; 100-blank. DETAILED DESCRIPTION

[0024] As attached Figure 1 and 2As shown, the present invention provides a spinning heating device, including a heating unit 7 and a heat preservation tube, the heating unit 7 is embedded in the rotating spindle 6, specifically, the heating unit 7 is a heating rod, the rotating spindle 6 is provided with a mounting hole in the axial direction, the heating rod is axially embedded in the mounting hole, the heat preservation tube is sleeved outside the rotating spindle 6 and is coaxially arranged with the rotating spindle 6, and a space for accommodating a blank 100 is reserved between the heat preservation tube and the rotating spindle 6, the heat preservation tube includes an outer tube 1 and an inner tube 2, the side wall of the outer tube 1 is provided with an opening 11, the opening 11 is used for the spinning wheel 5 to extend into, and in the axial direction of the outer tube 1, the outer tube 1 is located at the opening The parts at both ends of the opening 11 are retractable structures, such as a bellows structure. When a force is applied in the axial direction of the outer cylinder 1 through the opening 11, the retractable structures at both ends of the opening 11 on the outer cylinder 1 are correspondingly extended or compressed, so that the axial position of the opening 11 in the outer cylinder 1 changes. An opening 21 for the spinning wheel 5 to extend into is provided on the side wall of the inner cylinder 2. The axial width of the opening 21 in the inner cylinder 2 is greater than the axial width of the opening 11. Specifically, the axial width of the opening 21 in the inner cylinder 2 is slightly greater than the axial movement stroke of the spinning wheel 5, so that the spinning wheel 5 can move axially in the opening 21.

[0025] The present invention further includes a collector ring 71 and a carbon brush 72. Figure 1 As shown, the collector ring 71 is annular and fixed at one end of the rotating main shaft 6. The heating unit 7 is connected to the collector ring 71 through a wire. The carbon brush 72 is fixed by an external fixing frame, and the carbon brush 72 is located on one side of the collector ring 71 and contacts the collector ring 71. The carbon brush 72 is connected to the external power supply through a wire so that the heating unit 7 is connected to the external power supply. This connection method can satisfy the heating unit 7 to rotate with the rotating main shaft 6, and the external power supply does not need to rotate. Preferably, there are more than two heating units 7, and more than two heating units 7 are circumferentially arranged on the rotating main shaft 6 to improve the uniformity of the temperature in the circumferential direction of the rotating main shaft 6, thereby improving the uniformity of heating the blank 100. One end of the outer cylinder 1 and the inner cylinder 2 is fixed to the fixing seat of the heating device, and the other end of the outer cylinder 1 and the inner cylinder 2 is fixed to other brackets. Preferably, the outer cylinder 1 is a retractable structure as a whole, that is, the outer cylinder 1 is a bellows structure as a whole, and the material can be selected from any one of 304 stainless steel, low manganese carbon steel, silicon manganese carbon steel, and chrome vanadium steel. The inner tube 2 is preferably made of a high temperature resistant and heat insulating material.

[0026] The heating device provided by the present invention embeds the heating unit 7 on the rotating spindle 6 and heats the blank 100 by heat conduction, that is, the heat is transferred to the blank 100 installed on the rotating spindle 6 through the rotating spindle 6. Since the contact surface between the blank 100 and the rotating spindle 6 when the blank 100 is sleeved on the rotating spindle 6 is surface contact, this heating method belongs to surface contact heating for the blank 100, which is not only conducive to the rapid heating of the blank 100, but also compared with the local contact heating method, the overall temperature of the blank 100 after heating is relatively uniform in the present invention, which is more convenient for actual production and spin forming experiments. The setting of the insulation cylinder can reduce the diffusion and loss of heat of the blank 100 and improve the heating efficiency. Specifically, since the areas at both ends of the opening 11 on the outer cylinder 1 have a retractable structure, the size of the opening 11 only needs to meet the requirement that the spinning wheel 5 can extend into the blank 100 for processing. When the spinning wheel 5 is in the opening 11 and moves axially, the opening 11 can follow the spinning wheel 5 to move in the axial direction of the outer cylinder 1, thereby forming a relatively closed cylinder structure, reducing the diffusion and loss of heat and improving the heating efficiency. Compared with the single-layer structure of the outer cylinder 1, the present invention is configured as a double-layer structure of the outer cylinder 1 and the inner cylinder 2. The configuration of the inner cylinder 2 can guide and support the expansion and contraction of the outer cylinder 1 on the one hand, and can also isolate part of the heat on the other hand, avoiding that all the heat directly acts on the outer cylinder 1, slowing down the failure rate of the telescopic structure of the outer cylinder 1, and extending the service life of the outer cylinder 1.

[0027] In a preferred embodiment of the invention, based on the structure of the above-mentioned insulation cylinder, an air inlet 22 is opened on the side wall of one end of the inner cylinder 2, and the air inlet 22 passes through the outer cylinder 1 and is connected to an external hot air supply device, so as to supply hot air into the inner cylinder 2 to assist in heating the blank 100. That is, the present invention adopts a combination of hot air and a heating unit 7 to heat the blank 100 together to improve the heating efficiency, and under the action of the insulation cylinder, the hot air can surround the surface of the blank 100 to make the forming temperature more uniform.

[0028] The present invention also includes a spiral groove 4 arranged on the inner wall of the inner tube 2, and the air inlet 22 is located at the starting end of the spiral groove 4, which is used to guide the flow of hot air entering the insulation tube. When the rotating main shaft 6 rotates, combined with the setting of the spiral groove 4, the hot air can flow in a circumferential spiral shape in the inner tube 2, thereby improving the uniformity of the circumferential temperature in the insulation tube and avoiding the problem of circumferential temperature unevenness caused by all the hot air flowing directly along the axial direction to the outlet.

[0029] The specific formation structure of the spiral groove 4 is as follows: Figure 1As shown, the inner cylinder 2 is provided with ribs 3, which are spirally arranged on the inner wall of the inner cylinder 2, and the area between the ribs 3 on the inner wall of the inner cylinder 2 forms the spiral groove 4. In the present invention, preferably, in the use state, the distance between the ribs 3 and the side wall of the blank 100 is 5-10mm, so as to ensure that the blank 100 does not generate friction with the ribs 3 when rotating, and at the same time leave deformation space for the blank 100. For example, when the outer diameter of the blank 100 to be formed is preferably 300mm, the inner diameter of the inner cylinder 2 is 330mm, the thickness of the ribs 3 (i.e., the size of the ribs 3 in the radial direction of the inner cylinder 2) is 10mm, and the width of the ribs 3 (i.e., the size of the ribs 3 in the axial direction of the inner cylinder 2) is 1mm, so when the insulation cylinder is installed, the distance between the ribs 3 and the side wall of the blank 100 is 5mm.

[0030] In the present invention, the dimension of the air inlet 22 along the axial direction of the inner tube 2 is defined as its width, and the spacing between the spirally arranged ribs 3 is the groove of the spiral groove 4. Preferably, the ratio of the width of the air inlet 22 to the width of the spiral groove 4 is 1:1-2, and further preferably, the ratio of the width of the air inlet 22 to the width of the spiral groove 4 is 1:1 or 1:2.

[0031] The air inlet 22 is connected to an air inlet pipe 23, which passes through the outer tube 1 and is connected to an external hot air supply device. Preferably, one end of the air inlet pipe 23 connected to the air inlet 22 is arranged along the tangential direction of the side wall of the inner tube 2, so that the hot air is attached to the inner wall of the inner tube 2 when entering the inner tube 2 from the air inlet 22, which is more conducive to the hot air flowing along the spiral groove 4. Preferably, a flow detection unit, such as a gas flow meter, is arranged in the air inlet pipe 23 and is electrically connected to an external controller.

[0032] An air outlet is provided on the side wall at the other end of the inner cylinder 2, and the air outlet is located at the end of the spiral groove 4 for hot air discharge. The air outlet is connected to an air outlet pipe, which passes through the outer cylinder 1 and is connected to the hot air supply device to form a relatively closed hot air circulation heating. Preferably, one end of the air outlet pipe connected to the air outlet is arranged along the tangential direction of the side wall of the inner cylinder 2.

[0033] The present invention also includes a contact temperature measuring unit 10, which is used to be installed on the blank 100 and rotate with the blank 100 to directly contact and measure the temperature of the blank 100. The contact temperature measuring unit 10 is specifically a thermocouple. Compared with the traditional non-contact temperature detection method, the present invention uses a contact temperature measuring unit to perform contact temperature measurement on the blank 100, which reduces interference from factors such as the environment and emissivity, and can detect the temperature of a fixed position on the blank 100. The temperature change data of the blank 100 collected during the spinning process is more accurate.

[0034] Preferably, the contact temperature measuring unit 10 is provided with two groups, one group of contact temperature measuring units 10 is used to detect the surface temperature of the blank 100, and the other group of contact temperature measuring units 10 is used to detect the internal temperature of the blank 100, so that the experimenter can obtain the changing law of the surface and internal temperature of the blank 100 during the spinning forming process for subsequent calculation.

[0035] In the above-mentioned heating device, when the heat-insulating tube is not provided with ribs 3 and air inlet 22 and air outlet structure, the heat-insulating tube only performs heat-insulating function, reduces heat dissipation, and improves heating efficiency.

[0036] Experimental Example 1

[0037] Take the heating device in which the insulation cylinder is provided with an air inlet 22 and an air outlet structure but without ribs 3 as Experimental Example 1. In this Experimental Example 1, the outer diameter of the formed blank 100 is 300 mm, the inner diameter of the inner cylinder 2 is 330 mm, and the width of the air inlet is 10 mm. Run the device to move the spinning wheel 5 into the insulation cylinder. Turn on the air supply device and the heating unit 7. The hot air and the heating unit 7 heat the spinning wheel 5 and the blank 100 at the same time, and set the forming temperature to 574K. Start the spindle rotation program to allow the hot air to fully contact the blank 100; when the corresponding temperature meter detects that the blank 100 has reached the forming temperature, drive the spinning forming.

[0038] During the spinning process, the main shaft 6 rotates at a relatively high speed, and the spinning wheel 5 moves relatively slowly in the axial direction. Therefore, it is only necessary to have a uniform temperature distribution in the circumferential direction, so that the temperature of the spinning wheel forming is uniform. Figure 3 As shown, it is a transient distribution diagram of the surface temperature of the blank 100 in Experimental Example 1, where: Figure 3 The up-down direction is the circumferential direction of the blank 100 , and the left-right direction is the axial direction of the blank 100 . It can be seen that the effect of uniform temperature in the circumferential direction is not obvious.

[0039] Experimental Example 2

[0040] The heating device in which the insulation cylinder is provided with an air inlet 22, an air outlet structure and a spiral rib 3 is used as Experimental Example 2. In Experimental Example 2, the outer diameter of the formed blank 100 is 300mm, the inner diameter of the inner cylinder 2 is 330mm, the thickness of the rib 3 is 10mm, the width is 1mm, the width of the spiral groove 4 is 40mm, the width of the air inlet 22 is 20mm, and the ratio of the width of the spiral groove 4 to the width of the air inlet 22 is 2:1. The device is operated to move the spinning wheel 5 into the insulation cylinder. The air supply device and the heating unit 7 are turned on, and the hot air and the heating unit 7 heat the spinning wheel 5 and the blank 100 at the same time, and the forming temperature is set to 574K. The spindle rotation program is turned on to allow the hot air to fully contact the blank 100; when the corresponding temperature meter detects that the blank 100 has reached the forming temperature, it is driven to perform spinning.

[0041] During the spinning process, the main shaft 6 rotates at a relatively high speed, and the spinning wheel 5 moves relatively slowly in the axial direction. Therefore, it is only necessary to have a uniform temperature distribution in the circumferential direction, so that the temperature of the spinning wheel forming is uniform. Figure 4 As shown, it is a transient distribution diagram of the surface temperature of the blank 100 in Experimental Example 2, where: Figure 4 The up-down direction is the circumferential direction of the blank 100 , and the left-right direction is the axial direction of the blank 100 . It can be seen that the effect of uniform temperature in the circumferential direction is more obvious.

[0042] Experimental Example 3

[0043] The heating device in which the insulation cylinder is provided with an air inlet 22, an air outlet structure and a spiral rib 3 is used as Experimental Example 3. In Experimental Example 3, the outer diameter of the formed blank 100 is 300mm, the inner diameter of the inner cylinder 2 is 330mm, the thickness of the rib 3 is 10mm, the width is 1mm, the ratio of the width of the spiral groove 4 to the width of the air inlet 22 is 1:1, and the width of the spiral groove 4 to the width of the air inlet 22 is 40mm. The operating device moves the spinning wheel 5 into the insulation cylinder. Turn on the air supply device and the heating unit 7, and the hot air and the heating unit 7 heat the spinning wheel 5 and the blank 100 at the same time, and set the forming temperature to 574K. Start the spindle rotation program to allow the hot air to fully contact the blank 100; when the corresponding temperature meter detects that the blank 100 has reached the forming temperature, drive the spinning forming.

[0044] During the spinning process, the main shaft 6 rotates at a relatively high speed, and the spinning wheel 5 moves relatively slowly in the axial direction. Therefore, it is only necessary to have a uniform temperature distribution in the circumferential direction, so that the temperature of the spinning wheel forming is uniform. Figure 5 As shown, it is a transient distribution diagram of the surface temperature of the blank 100 in Experimental Example 3. It can be seen that the effect of uniform temperature in the circumferential direction is relatively ideal.

[0045] The present invention also provides a spinning temperature measurement method, which uses the above-mentioned spinning heating device and comprises the following steps:

[0046] S1. Install the contact temperature measuring unit 10 on the blank 100. Since two groups of contact temperature measuring units 10 are provided, S1 also includes axial holes at the end of the blank, one group of contact temperature measuring units 10 is installed in the holes to detect the internal temperature of the blank 100, and the other group of holes is installed at the end of the outer surface of the blank 100 to detect the surface temperature of the blank 100.

[0047] S2, fix the blank 100 with the contact temperature measuring unit 10 installed on the rotating spindle 6, fix the collector ring 71 at one end of the rotating spindle 6, connect the heating unit 7 embedded in the rotating spindle 6 with the collector ring 71, fix the carbon brush 72 on the external fixing frame, make the carbon brush 72 be located on the side of the collector ring 71 and contact the collector ring 71, connect the carbon brush 72 with the external power supply through the wire, so that the heating unit 7 is connected with the external power supply. The end of the rotating spindle 6 where the collector ring 7 is installed is also provided with a tail post 8, the tail post 8 is connected to the middle part of the end of the rotating spindle 6, and rotates with the rotating spindle 6, install the data recorder 9 on the tail post 8, and use the wire to connect the contact temperature measuring unit 10 with the data recorder 9, the data recorder 9 records and stores the temperature data collected by the contact temperature measuring unit 10, and uses it for analyzing the temperature change of the blank 100 during the spinning after the spinning.

[0048] Turn on the external power supply, and the heating unit 7 is powered on to transfer heat to the rotating spindle 6 and the blank 100 in turn. The data recorder 9 records the corresponding temperature data collected by the contact temperature measuring unit 10 in real time. When the blank 100 is heated to the set temperature, the spinning wheel 5 is used for spinning forming. The heating unit 7 continues to heat, and the contact temperature measuring unit 10 continues to detect the temperature to obtain the temperature data of the blank 100 at the corresponding time. In order to prevent the spinning wheel 5 from affecting the normal detection of the contact temperature measuring unit 10, a section of residual material whose surface does not contact the spinning wheel 5 can be reserved at the end of the blank 100. Two groups of contact temperature measuring units 10 are set in the residual material area. After spinning forming, the residual material area can be cut off.

Claims

1. A spinning forming heating device, characterized in that: The invention comprises a heating unit (7) and a heat-insulating cylinder, wherein the heating unit (7) is embedded in a rotating spindle (6), the heat-insulating cylinder is sleeved outside the rotating spindle (6), and a space for accommodating a blank (100) is reserved between the heat-insulating cylinder and the rotating spindle (6), the heat-insulating cylinder comprises an outer cylinder (1) and an inner cylinder (2), the side wall of the outer cylinder (1) is provided with an opening (11) for a spinning wheel (5) to extend into, and in the axial direction, the parts of the outer cylinder (1) located at both ends of the opening (11) are retractable structures, the side wall of the inner cylinder (2) is provided with an opening (21) for the spinning wheel (5) to extend into, and the spinning wheel (5) can move in the axial direction in the opening (21).

2. The spinning forming heating device according to claim 1, characterized in that: An air inlet (22) is provided on a side wall at one end of the inner cylinder (2), and the air inlet (22) passes through the outer cylinder (1) and is connected to an external hot air supply device.

3. The spinning forming heating device according to claim 2, characterized in that: It also includes a spiral groove (4) arranged on the inner wall of the inner tube (2), and the air inlet (22) is located at the starting end of the spiral groove (4).

4. The spinning forming heating device according to claim 3, characterized in that: Ribs (3) are arranged inside the inner cylinder (2), and the ribs (3) are arranged on the inner wall of the inner cylinder (2) in a spiral shape. The spiral groove (4) is formed in the area between the ribs (3) on the inner wall of the inner cylinder (2).

5. The spinning forming heating device according to claim 2 or 3, characterized in that: The ratio of the width of the air inlet (22) along the axial direction of the inner cylinder (2) to the width of the spiral groove (4) is 1:1-2.

6. The spinning forming heating device according to any one of claims 2 to 4, characterized in that: The air inlet (22) is connected to an external hot air supply device via an air inlet pipe (23); one end of the air inlet pipe (23) connected to the air inlet (22) is arranged along the tangential direction of the side wall of the inner tube (2).

7. The spinning forming heating device according to any one of claims 1 to 4, characterized in that: The outer cylinder (1) is a telescopic structure as a whole.

8. The spinning forming heating device according to any one of claims 1 to 4, characterized in that: Also included is a contact temperature measuring unit (10) for being installed on the blank (100).

9. A method for measuring temperature during spinning, characterized in that: Using the spinning forming heating device as claimed in claim 8, the spinning forming temperature measurement method comprises the following steps: S1, installing a contact temperature measuring unit (10) on a blank (100); S2. Fix the blank (100) equipped with the contact temperature measuring unit (10) on the rotating main shaft (6), connect the heating unit (7) to an external power supply, and connect the contact temperature measuring unit (10) to a data recorder (9), and the data recorder (9) records the temperature data collected by the contact temperature measuring unit (10).

10. The temperature measurement method of spin forming according to claim 9, characterized in that: The S1 also includes an axial opening at the end of the blank (100), and two groups of contact temperature measuring units (10) are arranged, one group of contact temperature measuring units (10) is installed in the hole, and is used to detect the internal temperature of the blank (100), and the other group of holes is installed at the end of the outer surface of the blank (100) and is used to detect the surface temperature of the blank (100).

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