Bent pipe fitting surface hot hole flanging forming machining device and method

Abstract

The invention discloses a pipe fitting surface hot hole flanging forming machining device and method, belongs to the technical field of pipe fitting hot machining, and aims to solve the problems that bent pipe fitting hole flanging clamping and positioning are difficult and the like. The device comprises a lower female die, a left female die, a male die assembly, a right female die and a support, a first arc-shaped positioning groove is machined in the upper end face of the lower female die, the bent radial inner side outer wall of the pipe fitting is attached to the first arc-shaped positioning groove in a matched mode, the left female die abuts against the left side of the upper portion of a pipe section where a base hole is located, and the right female die abuts against the right side of the upper portion of the pipe section where the base hole is located. A flanging outer hole is formed between the left female die and the right female die, the flanging outer hole is matched with the outer wall of a flange of a to-be-formed flanged hole, the upper surface of the male die body is matched with the inner wall of the flange of the to-be-formed flanged hole, the male die body is vertically arranged at the upper end of the support in a sliding mode, and the lower end of the support is connected with a lower platform of a press machine. And the upper end of the bracket is bent and extends into the pipe fitting. According to the device, the pipe fitting can be prevented from deviating due to uneven stress in the machining process, and meanwhile, the occupied external space is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe hot processing, in particular to a pipe surface hot flanging forming device and method, which is suitable for various metal pipes and part of thermoplastic plastic pipes to perform hot flanging forming operation on the surface, and can be widely applied to automobile manufacturing, aerospace, building pipeline and other industries. BACKGROUND

[0002] In the field of pipe processing, flanging process is a common processing method, which can form a hole structure with a certain height and wall thickness on the surface of the pipe to enhance the connection performance and carrying capacity of the hole part. For some materials with poor plasticity, such as stainless steel, titanium alloy, etc., it is difficult to perform flanging operation at room temperature, and the material is prone to crack and other defects, resulting in poor flanging quality. When the hole to be processed on the surface of the pipe is irregular in shape (such as oval, polygon, special curve, etc.), especially when flanging is performed on a curved pipe, the traditional flanging processing technology faces many problems, such as difficulty in clamping and positioning of the curved pipe, and the curved pipe is prone to deviation due to uneven stress. The existing hot flanging process can improve the plasticity of the material to some extent, but often has problems such as complex operation, high equipment cost and low production efficiency.

[0003] The purpose of the present application is to provide a pipe surface hot flanging forming device and method which is simple to operate and can accurately control the flanging quality. SUMMARY

[0004] The purpose of the present application is to provide a curved pipe surface hot flanging forming device and method to solve the problems of difficult clamping and positioning of the curved pipe, and easy deviation due to uneven stress. The technical solution adopted by the present application is as follows:

[0005] A curved pipe surface hot flanging forming device, the curved pipe has a base hole on the outer side wall of the curved pipe for flanging, the device comprises a heating device, a lower concave die, a left concave die, a convex die assembly, a right concave die and a bracket;

[0006] The upper end face of the lower die is machined with a first arc-shaped positioning groove, the curved radial inner side outer wall of the pipe fitting is adapted to fit the first arc-shaped positioning groove, the base hole is upwardly arranged, the lower die is fixed on the lower platform of the press machine, the left die abuts against the upper left side of the pipe section where the base hole is located, the right die abuts against the upper right side of the pipe section where the base hole is located, the left die and the right die form the upper die, the lower end face of the upper die is formed with a second arc-shaped positioning groove, the second arc-shaped positioning groove is adapted to the curved radial outer side outer wall of the pipe fitting, a vertically through flanging outer hole is formed between the left die and the right die, the flanging outer hole is adapted to the flanged outer wall of the hole to be formed, the punch assembly includes a punch pull rod device and a punch body, the upper surface of the punch body is adapted to the flanged inner wall of the hole to be formed, the punch body is vertically slidably arranged at the upper end of the bracket, the lower end of the bracket is connected with the lower platform of the press machine, the upper end of the bracket is curvedly extended into the pipe fitting, and the base hole is vertically aligned with the punch body, the lower end of the punch pull rod device penetrates through the flanging outer hole and is detachably connected with the punch body, and the heating device is installed on the upper side of the pipe fitting.

[0007] Further, the heating device is a high-frequency induction heating coil.

[0008] Further, the heating device includes a heating coil, a magnetic conducting ring, a magnetic control member, a connecting strip and a temperature sensor, the magnetic control member is a rectangular strip-shaped magnetic conducting member, the heating coil is adapted to the contour of the base hole, the magnetic conducting ring covers the inner periphery, the outer periphery and the upper side of the heating coil, the upper surface of the magnetic conducting ring is circumferentially provided with a plurality of guide grooves, a plurality of magnetic control members are correspondingly and slidably arranged in the guide grooves, and a plurality of temperature sensors are correspondingly connected with the magnetic control members through the connecting strip, and the temperature sensor faces the lower opening of the magnetic conducting ring.

[0009] Further, the number of guide grooves is 20-80, and the shortest distance between the guide grooves is 0.15-7mm.

[0010] Further, the opening edge of the magnetic conducting ring is an insulating ceramic edge.

[0011] Further, a control system is further included, and the temperature sensors and the heating coil are electrically connected with the control system.

[0012] Further, the top of the bracket is provided with an upwardly extending positioning column, and the lower part of the punch body is insertedly and slidably connected with the positioning column.

[0013] Further, the punch rod device comprises an upper linear driving device, a connecting seat, a rotary cylinder, a connecting rod and a positioning block, the upper linear driving device is a hydraulic cylinder, a pneumatic cylinder or an electric cylinder, the rotary cylinder is connected with the output end of the upper linear driving device through the connecting seat, the output end of the rotary cylinder is connected with the connecting rod, and the positioning block is a key-shaped component; a stepped hole is formed in the punch body, the stepped hole comprises a key-shaped hole and a circular truncated cone hole which are connected with each other, the key-shaped hole is matched with the outer contour of the positioning block, and the diameter of the circular truncated cone hole is matched with the length of the positioning block.

[0014] Further, the left punch is connected with the output end of the left driving device, and the right punch is connected with the output end of the right driving device; the left driving device is a hydraulic cylinder, a pneumatic cylinder or an electric cylinder; the right driving device is a hydraulic cylinder, a pneumatic cylinder or an electric cylinder; the left driving device is connected with the left column of the press machine, and the piston rod of the left driving device is horizontally arranged to the right; the right driving device is connected with the right column of the press machine, and the piston rod of the right driving device is horizontally arranged to the left.

[0015] The application also provides a large-scale continuous wind tunnel main drive motor stator drying method, which is realized by the above-mentioned curved pipe surface hot flanging forming device and comprises the following steps.

[0016] Step one, place the area where the base hole is located on the pipe in the lower heating area of the heating device;

[0017] Step two, start the heating power supply to inductively heat the surface of the pipe;

[0018] Step three, each temperature sensor measures the temperature of each part around the area where the base hole is located in real time, and transmits the temperature data to the control system; by adjusting the positions of each magnetic control component relative to the magnetic conducting ring, controlling the coverage area of each magnetic control component on the heating coil, independently regulating and controlling the inductive magnetic field intensity of different heating areas in real time, the surface inductive heating temperature of the pipe can be adjusted and controlled in real time according to the change of the hot flanging area;

[0019] Step four, after the surface of the pipe is heated, the pipe is slidably attached to the first arc-shaped positioning groove, the punch body is inserted into the pipe, and the base hole is aligned with the punch body, so as to prepare for the subsequent flanging forming;

[0020] Step five, move the left punch and the right punch horizontally through the left driving device and the right driving device, so that the left punch abuts against the upper left part of the pipe segment where the base hole is located, and the right punch abuts against the upper right part of the pipe segment where the base hole is located; the pipe is fixed and clamped through the left punch, the right punch and the lower punch;

[0021] Step six, vertically downwardly feed the positioning block into the circular truncated cone hole through the key-shaped hole by the upper linear driving device, rotate the positioning block by 90° through the rotary cylinder, and couple the punch rod device with the punch body through the positioning block.

[0022] Step seven, the punch body is pulled up by the up straight line driving device, the edge of the base hole is extruded and deformed by the punch body and the flanging outer hole, the convex edge of the flanging hole is formed, and the hot flanging forming process of the pipe fitting is completed.

[0023] Compared with the prior art, the beneficial effects of the present application are that:

[0024] 1、The present application realizes the precise regulation and control of the induction magnetic field and the heating temperature through two aspects: on the one hand, the transversely movable magnetic conducting sheet is adopted to control the coverage area of the induction coil, so as to accurately regulate and control the induction magnetic field strength of the corresponding heating area; on the other hand, a plurality of magnetic control members arranged in a ring are adopted, the whole induction space is divided into a plurality of independent areas, and through the segmented control of the induction magnetic field in the induction heating space, the uniformity of the overall induction heating temperature of the pipe fitting surface hot flanging area is ensured.

[0025] 2、The present application adopts a temperature sensor to monitor the temperature of different parts of the pipe fitting surface in real time, adopts a control system to collect the temperature signal, and controls the magnetic control member in real time, so as to control the induction temperature of different parts of the pipe fitting surface in real time.

[0026] 3、The present application adopts the modular design of separating the die device and the punch assembly, can flexibly adjust the size and relative position of each part according to the curvature radius and pipe diameter specification of the curved pipe fitting, does not need to replace the whole equipment, can adapt to the processing of different types of curved pipe fittings, and greatly reduces the equipment investment cost and changeover time.

[0027] 4、The present application fixes the punch body on the support and internally arranges the curved pipe fitting, the layout can ensure that the punch body is closely combined with the inner wall of the pipe fitting, avoids the deviation of the pipe fitting due to uneven stress in the processing process, reduces the occupation of the external space, and meets the processing requirements of the narrow work station. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structural schematic diagram of the device of the present application;

[0029] Figure 2 is a structural schematic diagram of the lower die;

[0030] Figure 3 is a cooperation schematic diagram of the left die and the right die;

[0031] Figure 4 is a cooperation sectional view of the punch assembly, the die assembly and the pipe fitting;

[0032] Figure 5 is a schematic diagram of the punch body;

[0033] Figure 6 is a sectional view of the punch body;

[0034] Figure 7 is a structural schematic diagram of the punch rod device;

[0035] Figure 8 is a structural schematic diagram of the bracket;

[0036] Figure 9 is a bottom perspective view of the heating device;

[0037] Figure 10 is a top perspective view of the heating device;

[0038] Figure 11 is a structural schematic diagram of the pipe;

[0039] Figure 12 is a schematic diagram of the device fixed on the gantry of the press.

[0040] In the figure, 1 is a heating device, 11 is a heating coil, 12 is a magnetic conducting ring, 13 is a magnetic control component, 14 is a connecting strip, 15 is a temperature sensor, 2 is a lower die, 21 is a first arc-shaped positioning groove, 3 is a left die, 31 is a left driving device, 4 is a punch assembly, 41 is an upper linear driving device, 42 is a connecting seat, 43 is a rotary cylinder, 44 is a connecting rod, 45 is a positioning block, 46 is a punch body, 47 is a key-shaped hole, 48 is a circular table hole, 5 is a right die, 51 is a right driving device, 6 is a pipe, 61 is a base hole, 7 is a bracket, 71 is a positioning column, 81 is a flanging outer hole, 82 is a second arc-shaped positioning groove, 91 is a lower platform, 92 is an upper platform, 93 is a left stand column, and 94 is a right stand column. DETAILED DESCRIPTION

[0041] To make the purpose, technical solutions and advantages of the present application clearer and more apparent, the present application will be described below through specific embodiments shown in the drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0042] The connection mentioned in the present application is divided into fixed connection and detachable connection. The fixed connection, i.e. the non-detachable connection, includes but is not limited to conventional fixed connection modes such as flanging connection, rivet connection, adhesive connection and welding connection. The detachable connection includes but is not limited to conventional detachable modes such as bolt connection, buckle connection, pin connection and hinge connection. When the specific connection mode is not explicitly limited, at least one connection mode can be found in the existing connection mode to achieve the function, which can be selected by the person skilled in the art as needed. For example, the fixed connection selects welding connection, and the detachable connection selects bolt connection.

[0043] The present invention will be further described in detail below with reference to the accompanying drawings. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0044] Example 1: As Figures 1-12 As shown, a hot-drilling forming device for bending pipe fittings is disclosed. The pipe fitting 6 is a slightly curved pipe fitting. The outer sidewall of the bending radial direction of the pipe fitting 6 is machined with a base hole 61 for drilling. The processing device includes a heating device 1, a lower die 2, a left die 3, a punch assembly 4, a right die 5, and a support 7.

[0045] A first arc-shaped positioning groove 21 is machined on the upper end surface of the lower die 2. The inner outer wall of the curved radial direction of the pipe 6 is adapted to fit the first arc-shaped positioning groove 21, and the pipe 6 can slide relative to the first arc-shaped positioning groove 21. The base hole 61 is set upward. The lower die 2 is fixed on the lower platform 91 of the press. The left die 3, the right die 5 and the lower die 2 are combined to form a complete die assembly. The left die 3 abuts against the upper left side of the pipe section where the base hole 61 is located, and the right die 5 abuts against the upper right side of the pipe section where the base hole 61 is located. The left die 3 and the right die 5 form the upper die. A second arc-shaped positioning groove 82 is formed on the lower end surface of the upper die. The second arc-shaped positioning groove 82 is adapted to fit the outer outer wall of the curved radial direction of the pipe 6. A vertically penetrating flanged outer hole 81 is formed between die 3 and right die 5. The flanged outer hole 81 is adapted to the outer wall of the flanged convex edge to be formed. The punch assembly 4 includes a punch tie rod device and a punch body 46. The upper surface of the punch body 46 is adapted to the inner wall of the flanged edge to be formed. The punch body 46 is vertically slidably mounted on the upper end of the bracket 7. The lower end of the bracket 7 is connected to the lower platform 91 of the press, and the connection position is in the extension direction of the first arc-shaped positioning groove 21. The upper end of the bracket 7 bends and extends into the pipe 6, and the base hole 61 is vertically aligned with the punch body 46. The lower end of the punch tie rod device passes through the flanged outer hole 81 and is detachably connected to the punch body 46. The heating device 1 is installed on the upper side of the pipe 6.

[0046] Heating device 1 is a high-frequency induction heating coil.

[0047] The heating device 1 includes a heating coil 11, a magnetic ring 12, a magnetic control component 13, a connecting strip 14, and a temperature sensor 15. The magnetic control component 13 is a rectangular strip-shaped magnetic conductor. The heating coil 11 is adapted to the contour of the base hole 61. The magnetic ring 12 covers the inner circumference, outer circumference, and upper side of the heating coil 11. The upper surface of the magnetic ring 12 is provided with several guide grooves in the circumferential direction. Several magnetic control components 13 are slidably disposed in several of the guide grooves. Several temperature sensors 15 are connected to several magnetic control components 13 one by one through the connecting strip 14. The temperature sensors 15 face the lower opening of the magnetic ring 12. When the heating device 1 heats the tube 6, the temperature sensors 15 measure the temperature of the surface heating area of ​​the tube 6.

[0048] The number of guide grooves is 20 to 80, and the shortest distance between guide grooves is 0.15mm to 7mm.

[0049] The opening edge of the magnetic ring 12 is an insulating ceramic edge.

[0050] It also includes a control system, with several temperature sensors 15 and heating coils 11 electrically connected to the control system.

[0051] The top of the bracket 7 is provided with an upwardly extending positioning post 71, and the lower part of the punch body 46 is inserted and slidably engaged with the positioning post 71.

[0052] The punch tie rod device includes an upper linear drive device 41, a connecting seat 42, a rotary cylinder 43, a connecting rod 44, and a positioning block 45. The upper linear drive device 41 is a hydraulic cylinder, a pneumatic cylinder, or an electric cylinder. The rotary cylinder 43 is connected to the output end of the upper linear drive device 41 through the connecting seat 42. The positioning block 45 is connected to the output end of the rotary cylinder 43 through the connecting rod 44. The connecting rod 44 is coaxially arranged with the piston rod of the upper linear drive device 41. The positioning block 45 is a flat key-shaped component. A stepped hole is machined on the punch body 46. The stepped hole includes a key-shaped hole 47 and a frustum hole 48 connected vertically. The key-shaped hole 47 is connected to the positioning block. The outer contour of the positioning block 45 is adapted to the diameter of the frustum hole 48 and the length of the positioning block 45. The upper linear drive device 41 is connected to the upper platform 92 of the press. The piston rod of the upper linear drive device 41 is set downward. The diameter of the connecting rod 44 is smaller than the width of the positioning block 45. When the piston rod of the upper linear drive device 41 extends, the positioning block 45 passes through the flanged outer hole 81, the base hole 61 and the key hole 47 in sequence. After the positioning block 45 enters the frustum hole 48, the rotary cylinder 43 works to drive the positioning block 45 to rotate 90°. The coupling between the punch tie rod device and the punch body 46 can be achieved through the positioning block 45.

[0053] The left die 3 is connected to the output end of the left drive device 31, and the right die 5 is connected to the output end of the right drive device 51. The left drive device 31 is a hydraulic cylinder, pneumatic cylinder, or electric cylinder, and the right drive device 51 is a hydraulic cylinder, pneumatic cylinder, or electric cylinder. The left drive device 31 is connected to the left column 93 of the press, and the piston rod of the left drive device 31 is set horizontally to the right. The right drive device 51 is connected to the right column 94 of the press, and the piston rod of the right drive device 51 is set horizontally to the left.

[0054] Before turning the hole, the lower opening of the magnetic ring 12 is fitted with the tube 6, so that the heating coil 11 is adapted and aligned with the base hole 61 to be turned. The edge of the base hole 61 is heated by the heating device 1. After heating is completed, the tube 6 is rotated along the bending axis so that the base hole 61 to be turned faces upward away from the first arc-shaped positioning groove 21. At this time, the bracket 7 extends into the tube 6. When the base hole 61 to be turned is aligned vertically with the punch body 46, the rotation of the tube 6 is stopped. The left die 3 and the right die 5 are moved horizontally to both sides of the tube 6 under the action of the left drive device 31 and the right drive device 51, respectively, and together with the lower die 2, they form a die assembly.

[0055] The punch tie rod device first moves vertically downward to send the positioning block 45 into the punch body 46. Then, the rotating cylinder 43 drives the connecting rod 44 and the positioning block 45 to rotate 90° clockwise. The positioning block 45 couples the punch tie rod device and the punch body 46. Finally, the upper linear drive device drives the punch body 46 to move vertically upward, and together with the left die 3 and the right die 5, it extrudes the edge of the base hole 61 to form a convex edge, completing the hot turning hole forming process of the pipe 6.

[0056] The advantages of this invention are:

[0057] 1. This invention achieves precise control of the induced magnetic field and heating temperature in two ways: First, a horizontally movable magnetic sheet is used to control its coverage area of ​​the induction coil, so as to precisely control the intensity of the induced magnetic field in the corresponding heating area; Second, multiple magnetic control components 13 arranged in a ring are used to divide the entire induction space into multiple independent areas. By dividing and controlling the induced magnetic field in the induction heating space, the uniformity of the overall induction heating temperature of the hot-flipped area on the surface of the pipe 6 is ensured.

[0058] 2. The present invention uses a temperature sensor 15 to monitor the temperature of different parts of the surface of the pipe fitting 6 in real time, and uses a control system to collect temperature signals and control the magnetic control component 13 in real time, which can control the sensing temperature of different parts of the surface of the pipe fitting 6 in real time.

[0059] 3. The present invention adopts a modular design that separates the die device (lower die 2 + left die 3 + right die 5) and the punch assembly 4 (punch tie rod device + punch body 42). The size and relative position of each component can be flexibly adjusted according to the curvature radius and pipe diameter of the bent pipe 6. It can adapt to the processing of different models of bent pipes without replacing the entire equipment, which greatly reduces the equipment investment cost and changeover time.

[0060] 4. The punch body 42 of the present invention is fixed on the bracket 7 and built into the inside of the curved pipe 6. This layout can ensure that the punch body 42 is tightly fitted to the inner wall of the pipe 6, avoid the pipe 6 from shifting due to uneven force during processing, and reduce the external space occupation to meet the processing needs of narrow workstations.

[0061] Example 2: Figures 1-12 As shown, a method for hot-forming the surface of a bent pipe fitting, based on the hot-forming processing device for the surface of a bent pipe fitting described in Embodiment 1, includes the following steps:

[0062] Step 1: Place the area containing the base hole 61 on the pipe fitting 6 within the heating zone below the heating device 1;

[0063] Step 2: Turn on the heating power supply to induction heat the surface of pipe 6;

[0064] Step 3: Each temperature sensor 15 measures the temperature of various parts around the area where the base hole 61 is located in real time and transmits the temperature data to the control system. By adjusting the position of each magnetic control component 13 relative to the magnetic ring 12, the coverage area of ​​each magnetic control component 13 on the heating coil 11 is controlled, and the intensity of the induced magnetic field in different heating areas is independently adjusted in real time, so as to realize the real-time control of the surface induction heating temperature of the pipe 6 according to the change of the hot hole area.

[0065] Step 4: After the surface of the pipe 6 is heated, the pipe 6 is slid into the first arc-shaped positioning groove 21, while the punch body 46 is inserted into the pipe 6 and the base hole 61 is aligned with the punch body 46 to prepare for subsequent hole forming.

[0066] Step 5: Move the left die 3 and the right die 5 horizontally using the left drive device 31 and the right drive device 51, so that the left die 3 abuts against the upper left part of the pipe section where the base hole 61 is located, and the right die 5 abuts against the upper right part of the pipe section where the base hole 61 is located, and fix and clamp the pipe fitting 6 by the left die 3, the right die 5 and the lower die 2.

[0067] Step 6: The positioning block 45 is vertically downward and fed into the frustum hole 48 through the key hole 47 by the upper linear drive device 41. The positioning block 45 is rotated 90° by the rotary cylinder 43. The positioning block 45 is used to achieve coupling between the punch tie rod device and the punch body 46.

[0068] Step 7: The upper linear drive device 41 pulls the punch body 46 upward, so that the punch body 46 and the flanged outer hole 81 cooperate to squeeze and deform the edge of the base hole 61, forming the flanged protrusion, thus completing the hot flanged forming process of the pipe fitting 6.

[0069] The above embodiments are merely illustrative examples of the present invention and do not limit its scope of protection. Those skilled in the art can make partial changes to them, as long as they do not exceed the spirit and essence of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A hot-drilling forming apparatus for a bent pipe fitting, wherein a base hole (61) for drilling is formed on the outer sidewall of the bent radial direction of the pipe fitting (6), characterized in that: The processing device includes a heating device (1), a lower die (2), a left die (3), a punch assembly (4), a right die (5), and a support (7). The upper end face of the lower die (2) is machined with a first arc-shaped positioning groove (21). The inner outer wall of the curved radial direction of the pipe fitting (6) is adapted to fit the first arc-shaped positioning groove (21). The base hole (61) is set upward. The lower die (2) is fixed on the lower platform (91) of the press. The left die (3) abuts against the upper left side of the pipe section where the base hole (61) is located, and the right die (5) abuts against the upper right side of the pipe section where the base hole (61) is located. The left die (3) and the right die (5) form the upper die. The lower end face of the upper die forms a second arc-shaped positioning groove (82). The second arc-shaped positioning groove (82) is adapted to fit the outer outer wall of the curved radial direction of the pipe fitting (6). A groove is formed between the left die (3) and the right die (5). A vertically penetrating flange outer hole (81) is adapted to the outer wall of the flanged hole to be formed. The punch assembly (4) includes a punch tie rod device and a punch body (46). The upper surface of the punch body (46) is adapted to the inner wall of the flanged hole to be formed. The punch body (46) is vertically slidably set at the upper end of the bracket (7). The lower end of the bracket (7) is connected to the lower platform (91) of the press. The upper end of the bracket (7) bends and extends into the pipe (6), and the base hole (61) is aligned vertically with the punch body (46). The lower end of the punch tie rod device passes through the flange outer hole (81) and is detachably connected to the punch body (46). The heating device (1) is installed on the upper side of the pipe (6).

2. The hot-drilling forming apparatus for the surface of bent pipe fittings according to claim 1, characterized in that: The heating device (1) is a high-frequency induction heating coil.

3. The hot-drilling forming apparatus for the surface of bent pipe fittings according to claim 2, characterized in that: The heating device (1) includes a heating coil (11), a magnetic ring (12), a magnetic control component (13), a connecting strip (14), and a temperature sensor (15). The magnetic control component (13) is a rectangular strip-shaped magnetic conductor component. The heating coil (11) is adapted to the contour of the base hole (61). The magnetic ring (12) covers the inner circumference, outer circumference, and upper side of the heating coil (11). The upper surface of the magnetic ring (12) is provided with several guide grooves in the circumferential direction. Several magnetic control components (13) are slidably arranged in several of the guide grooves. Several temperature sensors (15) are connected to several magnetic control components (13) one by one through the connecting strip (14). The temperature sensors (15) face the lower opening of the magnetic ring (12). When the heating device (1) heats the pipe (6), the temperature sensor (15) measures the surface heating area temperature of the pipe (6).

4. The hot-drilling forming apparatus for the surface of bent pipe fittings according to claim 3, characterized in that: The number of guide grooves is 20 to 80, and the shortest distance between guide grooves is 0.15mm to 7mm.

5. The hot-drilling forming apparatus for the surface of a bent pipe fitting according to claim 4, characterized in that: The opening edge of the magnetic ring (12) is an insulating ceramic edge.

6. The hot-drilling forming apparatus for the surface of a bent pipe fitting according to claim 5, characterized in that: It also includes a control system, and several temperature sensors (15) and heating coils (11) are electrically connected to the control system.

7. The hot-drilling forming apparatus for the surface of a bent pipe fitting according to claim 6, characterized in that: The top of the bracket (7) is provided with an upwardly extending positioning post (71), and the lower part of the punch body (46) is inserted and slidably engaged with the positioning post (71).

8. The hot-drilling forming apparatus for the surface of a bent pipe fitting according to claim 7, characterized in that: The punch tie rod device includes an upper linear drive device (41), a connecting seat (42), a rotary cylinder (43), a connecting rod (44), and a positioning block (45). The upper linear drive device (41) is a hydraulic cylinder, a pneumatic cylinder, or an electric cylinder. The rotary cylinder (43) is connected to the output end of the upper linear drive device (41) through the connecting seat (42). The positioning block (45) is connected to the output end of the rotary cylinder (43) through the connecting rod (44). The positioning block (45) is a flat key-shaped component. The punch body (46) is machined with a stepped hole. The stepped hole includes a key-shaped hole (47) connected vertically and a frustum hole (48). The key-shaped hole (47) is adapted to the outer contour of the positioning block (45), and the diameter of the frustum hole (48) is adapted to the length of the positioning block (45).

9. The hot-drilling forming apparatus for the surface of a bent pipe fitting according to claim 8, characterized in that: The left die (3) is connected to the output end of the left drive device (31), and the right die (5) is connected to the output end of the right drive device (51). The left drive device (31) is a hydraulic cylinder, pneumatic cylinder or electric cylinder, and the right drive device (51) is a hydraulic cylinder, pneumatic cylinder or electric cylinder. The left drive device (31) is connected to the left column (93) of the press. The piston rod of the left drive device (31) is set horizontally to the right. The right drive device (51) is connected to the right column (94) of the press. The piston rod of the right drive device (51) is set horizontally to the left.

10. A method for hot-forming a hole in the surface of a bent pipe fitting, implemented using the hot-forming device for hot-forming a hole in the surface of a bent pipe fitting as described in claim 9, characterized in that... Includes the following steps: Step 1: Place the area where the base hole (61) on the pipe fitting (6) is located in the heating zone below the heating device (1); Step 2: Turn on the heating power supply to perform induction heating on the surface of the pipe fitting (6); Step 3: Each temperature sensor (15) measures the temperature of each part around the base hole (61) in real time and transmits the temperature data to the control system. By adjusting the position of each magnetic control component (13) relative to the magnetic ring (12), the coverage area of ​​each magnetic control component (13) on the heating coil (11) is controlled, and the magnetic field strength of different heating areas is independently adjusted in real time, so as to realize the real-time control of the surface induction heating temperature of the pipe fitting (6) with the change of the hot hole area. Step 4: After the surface heating of the pipe (6) is completed, the pipe (6) is slid into the first arc-shaped positioning groove (21), and the punch body (46) is inserted into the pipe (6), and the base hole (61) is aligned with the punch body (46) to prepare for subsequent hole forming. Step 5: Move the left die (3) and right die (5) horizontally using the left drive device (31) and the right drive device (51), so that the left die (3) abuts against the upper left side of the pipe section where the base hole (61) is located, and the right die (5) abuts against the upper right side of the pipe section where the base hole (61) is located, and fix and clamp the pipe fitting (6) by the left die (3), the right die (5) and the lower die (2). Step 6: The positioning block (45) is vertically downward and fed into the frustum hole (48) through the key hole (47) by the upper linear drive device (41). The positioning block (45) is rotated 90° by the rotary cylinder (43). The positioning block (45) is used to achieve the coupling between the punch tie rod device and the punch body (46). Step 7: Pull the punch body (46) upward by the upper linear drive device (41) so that the punch body (46) and the flanged outer hole (81) cooperate to squeeze and deform the edge of the base hole (61) to form the flanged edge, thus completing the hot flanged forming process of the pipe fitting (6).

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