Electric auxiliary heating pipe spinning forming device and method

Abstract

The invention discloses an electric auxiliary heating pipe spinning forming device and method. The problems that in the prior art, an electromagnetic induction hot spinning forming technology is high in cost, and a flame heating hot spinning forming device is complex and large in energy consumption, affects the product quality and has strict requirements for the shape of a blank are solved. Comprising a mandrel mechanism sleeved with a pipe blank, a tail jacking mechanism is coaxially arranged at the extending end of the mandrel mechanism, an upper supporting frame and a lower supporting frame are arranged above and below the mandrel mechanism respectively, and fan-shaped electric brushes used for making contact with the outer wall of a pipe are arranged on the upper supporting frame and the lower supporting frame respectively. Conductive electrodes on the fan-shaped electric brushes are connected with a direct-current power source through cables, and a plurality of sets of spinning roller mechanisms are arranged on the periphery of the outer side of the mandrel mechanism. The spinning forming device and method can effectively solve the problem of spinning forming of materials difficult to deform and pipes with large forming force at the normal temperature, the tool is simple in structure, safe and reliable, current output is adjustable, and the spinning forming device and method can adapt to heating spinning forming of the pipes with different thicknesses and materials.

Description

Technical Field

[0001] The invention belongs to the technical field of metal pipe processing, and in particular relates to an electric auxiliary heating pipe spinning forming device and method. Background Art

[0002] Metal spinning technology is an advanced plastic processing technology with little or no cutting, which integrates the process characteristics of forging, stretching, extrusion, bending, ring rolling, cross rolling and rolling. It is an extremely effective forming technology for near-net forming of materials. This forming technology has good deformation conditions, good product performance, high dimensional accuracy, high material utilization rate, and a wide range of products. It can be used to make integral seamless hollow rotating parts, especially suitable for the forming of difficult-to-deform metals with poor plasticity. At present, flame heating and electromagnetic induction are more common methods in hot spinning forming technology. Although the electromagnetic induction heating method is simple and easy, energy collection is convenient, and the device is easy to operate and maintain, the cost of electromagnetic induction is relatively high; therefore, flame heating is the most common hot spinning method. However, the heating temperature and uniformity of the blank greatly affect the product quality. Moreover, the device is complex, the energy consumption is large, and the heat insulation treatment with the machine tool is difficult, which seriously limits its development. In addition, some existing integral self-resistance heating progressive forming methods have long heating time, low forming accuracy, high requirements on the shape of the blank, and are not suitable for the forming of larger blanks. Therefore, it is necessary to improve the prior art method and device for electrically assisted heating pipe spinning. Summary of the invention

[0003] The present invention aims at the above-mentioned problems and provides an electrically assisted heating pipe spinning forming device and method that can effectively solve the problem of spinning forming of difficult-to-deform materials and pipes with large forming force at room temperature. The tooling structure is simple, safe and reliable, the current output is adjustable, and it can adapt to the heating spinning forming of pipes of different thicknesses and materials.

[0004] The technical solution adopted by the present invention is: the electric assisted heating pipe spinning forming device includes a mandrel mechanism, characterized in that: a pipe blank is sleeved on the mandrel mechanism, a tail top mechanism is coaxially arranged at the extended end of the mandrel mechanism, an upper support frame and a lower support frame are respectively arranged above and below the mandrel mechanism, and both the upper support frame and the lower support frame are provided with fan-shaped brushes for contacting the outer wall of the pipe blank, and the fan-shaped brushes are provided with conductive electrodes for annularly heating the pipe blank, and the conductive electrodes are connected to a DC power supply through cables; and, a plurality of groups of rotating wheel mechanisms for forming the pipe blank are also arranged on the periphery of the outer side of the mandrel mechanism, the rotating wheel mechanism is connected to a rotating wheel feeding bracket, and the upper support frame and the lower support frame are also respectively connected to the rotating wheel feeding bracket.

[0005] The core shaft mechanism includes a forming core shaft, one end of the forming core shaft is provided with a tail top positioning groove, the other end of the forming core shaft is provided with a core shaft tail flange, and a plurality of groups of bolt mounting holes are provided on the core shaft tail flange, the core shaft tail flange is matched and connected with the installation flange protrusion on the end face of the installation flange through the core shaft flange groove provided on its end face, and the core shaft tail flange is connected with the bolt connecting screw holes correspondingly provided on the installation flange through the connecting bolts provided in the bolt mounting holes; an inter-flange insulating gasket is provided between the core shaft tail flange and the installation flange, and a plurality of flange gasket openings are provided on the outer periphery of the inter-flange insulating gasket; a flange groove insulating gasket is provided in the core shaft flange groove of the core shaft tail flange, and a core shaft cover plate is also provided on the front side of the core shaft tail flange, the core shaft cover plate is sleeved on the outer side of the pipe blank, and a core shaft cover insulating gasket is also provided between the core shaft cover plate and the core shaft tail flange. The core shaft tail flange and the device flange are assembled and connected together by matching the core shaft flange groove and the device flange protrusion, and are fastened with connecting bolts. The core shaft mechanism and the pipe blank mounted thereon are driven to rotate continuously through the rotation of the device flange. At the same time, when the pipe blank is energized, insulating gaskets arranged between various connecting parts are used to effectively prevent the spinning equipment from being electrified.

[0006] The root of the forming mandrel and the front side of the mandrel tail flange are provided with tube blank connection convex teeth, and correspondingly, the rear end of the tube blank is provided with mandrel connection concave teeth for matching and connecting with the tube blank connection convex teeth. The tube blank is fixedly connected to the mandrel tail flange at the end of the forming mandrel by using the matching assembly of the mandrel connection concave teeth and the tube blank connection convex teeth, so as to facilitate the synchronous rotation of the tube blank.

[0007] The tail top mechanism includes a spindle tail top, one end of the spindle tail top is provided with a top for connecting with the end of the spindle mechanism, the other end of the spindle tail top is provided with a tail top flange, and a plurality of groups of bolt mounting holes are provided on the tail top flange, the tail top flange is matched and connected with the device flange protrusion on the end face of the device flange through a tail top flange groove provided on its end face, and the tail top flange is connected with the bolt connecting screw holes correspondingly provided on the device flange through connecting bolts provided in the bolt mounting holes; an inter-flange insulating gasket is provided between the tail top flange and the device flange, and a plurality of flange gasket openings are provided on the outer periphery of the inter-flange insulating gasket; a flange groove insulating gasket is provided in the tail top flange groove of the tail top flange, a tail top cover plate is also provided on the front side of the tail top flange, the tail top cover plate is sleeved on the outer side of the spindle tail top, and a tail top cover insulating gasket is also provided between the tail top cover plate and the tail top flange. The tail top flange and the device flange are assembled and connected together by matching the groove of the tail top flange and the protrusion of the device flange, and are fastened with connecting bolts, so that the tail top mechanism rotates synchronously with the rotation of the core shaft mechanism, and the insulating gaskets arranged between the various connection parts are used to effectively prevent the spinning equipment from being electrified.

[0008] The spinning wheel mechanism includes a spinning wheel, on which a plurality of bolt mounting holes are arranged, and the spinning wheel is matched and connected with the spinning wheel connecting protrusion arranged on the end surface of the device flange through the spinning wheel connecting groove arranged on the end surface, and the spinning wheel is connected with the bolt connecting screw hole arranged on the device flange through the connecting bolt arranged in the bolt mounting hole; an insulating gasket between the spinning wheels is arranged between the spinning wheel and the device flange, and a spinning wheel gasket matching hole is arranged in the middle of the insulating gasket between the spinning wheels; a spinning wheel groove insulating gasket is arranged in the spinning wheel connecting groove of the spinning wheel, and a spinning wheel cover plate is also arranged on the front side of the spinning wheel, and a spinning wheel cover insulating gasket is also arranged between the spinning wheel cover plate and the spinning wheel. The spinning wheel and the device flange are assembled and connected together by matching the spinning wheel connecting groove and the spinning wheel connecting protrusion, and are fastened by connecting bolts, so that the spinning wheel mechanism can be passively rotated with the rotation of the mandrel mechanism, which is convenient for the heating and spinning forming of the pipe; and the insulating gaskets arranged between each connection part are used to effectively prevent the spinning equipment from being electrified.

[0009] There are three groups of the rotary wheel mechanisms, and the three groups of rotary wheel mechanisms are spaced 120 degrees apart and evenly arranged on the same circumference; the arrangement position of the rotary wheel mechanism is adjustable. In the process of the rotation of the mandrel mechanism, the three groups of rotary wheel mechanisms evenly arranged on the outside of the tube blank and on the same circumference are driven to passively rotate, thereby forming the heated tube blank; at the same time, the arrangement position of the rotary wheel mechanism can be flexibly adjusted according to the different tube thicknesses of the tube blank.

[0010] The upper support frame and the lower support frame have the same structure. Both the upper support frame and the lower support frame include an L-shaped support frame. The end of the L-shaped support frame is provided with a telescopic support rod arranged radially along the pipe blank. One end of the telescopic support rod is provided in a support rod installation slot at the end of the L-shaped support frame. The bottom end of the support rod installation slot is closed with an installation slot end cover. A compression spring is provided between the bottom end of the support rod installation slot and the end of the telescopic support rod. The other end of the telescopic support rod is provided with a fan-shaped brush, and a brush insulation gasket is also provided between the fan-shaped brush and the end of the telescopic support rod. The elastic force of the compression spring provided in the support rod installation slot of the L-shaped support frame is used to drive the telescopic support rod to move radially toward the pipe blank, so that the fan-shaped brush at the end of the telescopic support rod can form a close contact with the outer wall of the pipe blank, so that the upper and lower fan-shaped brushes form a loop to heat the processing area of ​​the pipe blank.

[0011] The fan-shaped brush is made of graphite material or copper material.

[0012] Brush devices for removing grinding chips are respectively arranged on both sides of the fan-shaped brush, so as to remove the grinding chips dropped during the high-speed rotation of the pipe blank, avoid the influence of the grinding chips on the product quality, and ensure the processing quality.

[0013] Furthermore, the method for performing pipe spinning using the above-mentioned electrically assisted heating pipe spinning device comprises the following steps: Step 1: sleeve the pipe blank to be processed on the forming mandrel of the mandrel mechanism, and make the mandrel connecting concave teeth at the rear end of the pipe blank match and connect with the pipe blank connecting convex teeth at the root of the forming mandrel; Step 2: After the pipe blank and the mandrel mechanism are assembled in place, the tail top mechanism is pushed toward the end of the mandrel mechanism so that the top of the mandrel tail top of the tail top mechanism is in contact with the tail top positioning groove at the end of the forming mandrel of the mandrel mechanism; Step 3: After the tail push mechanism presses the end of the mandrel mechanism tightly, the arrangement position of the rotary wheel mechanism is adjusted according to the diameter of the tube blank, and each set of rotary wheel mechanisms is pushed toward the processing position of the tube blank sleeved outside the mandrel mechanism; Step 4: install the two sets of telescopic support rods in the support rod installation slots of the upper support frame and the lower support frame respectively, and arrange the telescopic support rods along the radial direction of the pipe blank, and make the fan-shaped brushes and the conductive electrodes at the ends of the telescopic support rods form sufficient and good contact with the outer wall of the pipe blank, the conductive electrodes are connected to the DC power supply through cables, and the fan-shaped brushes on the upper and lower support frames and the annular parts on the pipe blank surrounded by them form a ring loop; Step 5: Set an infrared thermal imaging thermometer outside the tube spinning device to monitor the temperature between the two sets of fan-shaped brushes and the processing area of ​​the tube blank, and use the thermometer to determine the range of the temperature uniform area on the tube blank to determine the initial feeding distance of the rotary wheel mechanism; Step 6: When the processing area of ​​the tube blank reaches a predetermined temperature, the DC power supply is turned off, and the mandrel mechanism is started to drive the tube blank to rotate actively. Then, the rotary wheel feed bracket is driven to feed the rotary wheel mechanism forward. At the same time, the spinning wheels on each group of rotary wheel mechanisms are passively rotated, so as to perform spinning forming on the processing area of ​​the heated tube blank. Step 7. When the temperature measuring instrument detects that the feeding distance of the rotary wheel feed bracket is about to reach the unheated area, the feeding of the rotary wheel feed bracket is stopped, and then the coolant is sprayed to cool the pipe blank; after the pipe blank is cooled, the DC power supply is started again, and the above steps of heating the processing area of ​​the pipe blank and spinning forward the rotary wheel mechanism are repeated until the spinning forming process of the entire pipe blank is completed.

[0014] The beneficial effects of the present invention are as follows: since the present invention adopts a mandrel mechanism on which a tube blank is sleeved, a tail top mechanism is coaxially arranged at the extended end of the mandrel mechanism, an upper support frame and a lower support frame are respectively arranged above and below the mandrel mechanism, and fan-shaped brushes for contacting the outer wall of the tube blank are arranged on the upper support frame and the lower support frame, and conductive electrodes are arranged on the fan-shaped brushes, and the conductive electrodes are connected to a DC power supply through cables, and a plurality of groups of rotary wheel mechanism structures and corresponding spinning forming methods are arranged around the outer side of the mandrel mechanism, so the design is reasonable and the structure is compact, which effectively solves the problem of spinning forming of materials that are difficult to deform at room temperature and tubes with large forming force, the tooling structure of the forming device is simple, safe and reliable, the current output is adjustable, and it can adapt to the heating and spinning forming of tubes of different thicknesses and materials; at the same time, the output current of the device is large, which is conducive to the rapid heating of the tube and the short heating time of the tube; moreover, the output voltage value is low, which will not cause a safety threat to the operator; high temperature reduces the forming force required for tube spinning and reduces the output power requirement of the spinning machine. The electrically assisted heating pipe spinning forming device and method are suitable for spinning forming of pipes such as pure titanium, titanium alloy and magnesium alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Figure 2 yes Figure 1 A-direction view.

[0017] Figure 3 yes Figure 2 A structural schematic diagram of the mandrel mechanism and the tube blank.

[0018] Figure 4 yes Figure 3 A cross-sectional view of the internal structure.

[0019] Figure 5 yes Figure 3 Schematic diagram of an explosion structure.

[0020] Figure 6 yes Figure 5 A structural schematic diagram of the forming mandrel in FIG.

[0021] Figure 7 yes Figure 6 B view.

[0022] Figure 8 yes Figure 5 A structural schematic diagram of the tube blank in FIG.

[0023] Fig. 9 yes Figure 1 A structural schematic diagram of the tail top mechanism in FIG.

[0024] Fig.10 yes Fig. 9 A cross-sectional view of the internal structure.

[0025] Fig.11 yes Fig. 9 Schematic diagram of an explosion structure.

[0026] Fig.12 yes Figure 1 A structural schematic diagram of the rotary wheel mechanism in FIG.

[0027] Fig.13 yes Fig.12 A cross-sectional view of the internal structure.

[0028] Fig.14 yes Fig.12 Schematic diagram of an explosion structure.

[0029] Fig.15 yes Figure 1 A structural schematic diagram of an upper support frame (or lower support frame) in FIG.

[0030] Fig.16 yes Fig.15 A cross-sectional view of the internal structure.

[0031] Fig.17 yes Fig.15 Schematic diagram of an explosion structure.

[0032] Explanation of the numbers in the figure: 1 spindle mechanism, 2 tail top mechanism, 3 rotary wheel mechanism, 4 upper support frame, 5 fan-shaped brush, 6 lower support frame, 7 pipe blank, 8 forming spindle, 9 spindle tail flange, 10 installation flange, 11 spindle cover, 12 connecting bolts, 13 spindle cover insulating gasket, 14 flange between insulating gaskets, 15 flange groove insulating gasket, 16 tail top positioning groove, 17 installation flange protrusion, 18 bolt connection screw hole, 19 flange gasket opening 20, spindle flange groove, 21, bolt mounting hole, 22, tube blank connection convex tooth, 23, spindle connection concave tooth, 24, spindle tail top, 25, tail top flange, 26, tail top cover, 27, tail top cover insulating gasket, 28, tail top flange groove, 29, spinning wheel, 30, spinning wheel cover, 31, spinning wheel cover insulating gasket, 32, spinning wheel inter-insulating gasket, 33, spinning wheel groove insulating gasket, 34, spinning wheel connection protrusion, 35, spinning wheel gasket matching hole, 36, spinning wheel connection groove, 37, L-shaped bracket, 38, mounting groove end cover, 39, telescopic support rod, 40, support rod mounting slot, 41, compression spring, 42, brush insulating gasket. DETAILED DESCRIPTION

[0033] according to Figures 1 to 17 The specific structure and method steps of the present invention are described in detail. The electric auxiliary heating pipe spinning forming device comprises a mandrel mechanism 1, on which a pipe blank 7 is sleeved. The mandrel mechanism 1 is composed of a forming mandrel 8, one end of which is provided with a tail top positioning groove 16, and the other end of the forming mandrel 8 is provided with a mandrel tail flange 9; a plurality of groups of bolt mounting holes 21 arranged along the same circumference are provided on the mandrel tail flange 9, and the mandrel tail flange 9 is matched and connected with the installation flange protrusion 17 on the end face of the installation flange 10 through the mandrel flange groove 20 provided on its end face, and the mandrel tail flange 9 is connected with the corresponding bolt connecting screw hole 18 on the installation flange 10 through the connecting bolt 12 provided in the bolt mounting hole 21; and then the mandrel tail flange 9 is assembled and connected with the installation flange 10 through the cooperation of the mandrel flange groove 20 and the installation flange protrusion 17, and is fastened with the connecting bolt 12, and then the mandrel mechanism 1 and the pipe blank 7 sleeved thereon are driven to rotate continuously through the rotation of the installation flange 10.

[0034] At the same time, an inter-flange insulating gasket 14 is arranged between the mandrel tail flange 9 and the device flange 10, and a plurality of flange gasket openings 19 are arranged on the outer periphery of the inter-flange insulating gasket 14. A flange groove insulating gasket is arranged in the mandrel flange groove 20 of the mandrel tail flange 9, and a mandrel cover plate 11 is also arranged on the front side of the mandrel tail flange 9. The mandrel cover plate 11 is sleeved on the outer side of the pipe blank 7, and a mandrel cover insulating gasket 13 is also arranged between the mandrel cover plate 11 and the mandrel tail flange 9. Moreover, according to specific use needs, an insulating sleeve and an insulating gasket can be respectively arranged between the connecting bolt 12 and the bolt mounting hole 21, and between the connecting bolt 12 and the mandrel cover plate 11. Therefore, when the pipe blank 7 is energized through the conductive electrode on the fan-shaped brush 5, the insulating gaskets arranged between the various connecting parts are used to effectively prevent the spinning equipment from being charged. In addition, tube blank connecting convex teeth 22 are provided at the root of the forming mandrel 8 and the front side of the mandrel tail flange 9; correspondingly, the rear end of the tube blank 7 is provided with mandrel connecting concave teeth 23 for matching and connecting with the tube blank connecting convex teeth 22, and then the mandrel connecting concave teeth 23 and the tube blank connecting convex teeth 22 are matched and assembled to fix the tube blank 7 on the mandrel tail flange 9 at the end of the forming mandrel 8, so as to facilitate the synchronous rotation of the tube blank 7.

[0035] The extended end of the forming mandrel 8 of the mandrel mechanism 1 is coaxially provided with a tail top mechanism 2, which includes a mandrel tail top 24, one end of which is provided with a top for connecting with the tail top positioning groove 16 at the end of the forming mandrel 8; the other end of the mandrel tail top 24 is provided with a tail top flange 25, on which are provided a plurality of groups of bolt mounting holes 21 arranged along the same circumference, and the tail top flange 25 is matched and connected with the device flange protrusion 17 on the end face of the device flange 10 through the tail top flange groove 28 provided on its end face, and the tail top flange 25 is connected with the bolt connection screw hole 18 correspondingly provided on the device flange 10 through the connection bolt 12 provided in the bolt mounting hole 21. Moreover, an inter-flange insulating gasket 14 is provided between the tail top flange 25 and the device flange 10, and a plurality of flange gasket openings 19 for avoiding the device flange protrusion 17 are provided on the outer periphery of the inter-flange insulating gasket 14. A flange groove insulating gasket is arranged in the tail top flange groove 28 of the tail top flange 25, and a tail top cover plate 26 is also arranged on the front side of the tail top flange 25. The tail top cover plate 26 is sleeved on the outer side of the mandrel tail top 24, and a tail top cover insulating gasket 27 is also arranged between the tail top cover plate 26 and the tail top flange 25; according to specific use needs, an insulating sleeve and an insulating gasket can be respectively arranged between the connecting bolt 12 and the bolt mounting hole 21, and between the connecting bolt 12 and the tail top cover plate 26. Thus, the tail top flange 25 and the device flange 10 are assembled and connected together through the cooperation of the tail top flange groove 28 and the device flange protrusion 17, and are fastened by the connecting bolt 12, so that the tail top mechanism 2 rotates synchronously with the rotation of the mandrel mechanism 1, and the insulating gaskets arranged between the various connection parts are used to effectively prevent the spinning equipment from being electrified.

[0036] An upper support frame 4 and a lower support frame 6 are respectively arranged above and below the core shaft mechanism 1. The upper support frame 4 and the lower support frame 6 have the same structure. The upper support frame 4 and the lower support frame 6 both include an L-shaped bracket 37. A telescopic support rod 39 arranged radially along the pipe blank 7 is arranged at the front end of the L-shaped bracket 37. One end of the telescopic support rod 39 is movably arranged in a support rod mounting slot 40 at the front end of the L-shaped bracket 37, and the bottom end of the support rod mounting slot 40 is closed with a mounting slot end cover 38; a compression spring 41 is arranged between the bottom end of the support rod mounting slot 40 and the end of the telescopic support rod 39. The other end of the telescopic support rod 39 is provided with a fan-shaped brush 5 for contacting the outer wall of the tube blank 7. The fan-shaped brush 5 can be made of graphite material or copper material, and the fan-shaped brush 5 is provided with a conductive electrode for annularly heating the tube blank 7. The conductive electrode is connected to a DC power supply through a cable (or wire). The DC power supply can be a high-frequency low-voltage power supply, and the low-voltage and high-current output voltage does not exceed 10V, and the DC current does not exceed 1000A; a brush insulation gasket 42 is also provided between the fan-shaped brush 5 and the end of the telescopic support rod 39. Then, the elastic force of the compression spring 41 set in the support rod installation slot 40 of the L-shaped bracket 37 is used to drive the telescopic support rod 39 to move radially toward the pipe blank 7, so that the fan-shaped brush 5 at the end of the telescopic support rod 39 can form a close contact with the outer wall of the pipe blank 7, so that the upper and lower fan-shaped brushes 5 form a loop to heat the processing area of ​​the pipe blank 7; and a thermometer is also set at the processing area to measure the temperature of the processing area. At the same time, brush devices for removing grinding chips are respectively set on both sides of the fan-shaped brush 5 to remove the grinding chips dropped during the high-speed rotation of the pipe blank 7, so as to avoid the influence of grinding chips on product quality and ensure the processing quality.

[0037] Several groups of rotary wheel mechanisms 3 for forming the tube blank 7 are also arranged on the outer periphery of the forming mandrel 8 of the mandrel mechanism 1, and the rotary wheel mechanisms 3 are connected to a rotary wheel feed bracket that can move forward and backward along the axial direction of the tube blank 7, and the upper support frame 4 and the lower support frame 6 are also connected to the rotary wheel feed bracket respectively, so as to ensure that the heating area of ​​the fan-shaped brushes 5 on the upper and lower support frames is concentrated on the part where the rotary wheel mechanism 3 contacts the tube blank 7. According to the specific production and processing needs, the number of rotary wheel mechanisms 3 can be set to three groups, and the three groups of rotary wheel mechanisms 3 are respectively spaced 120 degrees apart and evenly arranged on the same circumference; and then, during the rotation of the mandrel mechanism 1, the three groups of rotary wheel mechanisms 3 evenly arranged on the outer side of the tube blank 7 and on the same circumference are driven to passively rotate, so as to perform annular heating on the tube blank 7 through the two fan-shaped brushes 5 respectively arranged on the upper support frame 4 and the lower support frame 6, and the heating and forming process of the tube blank 7 is completed by utilizing the synergistic effect of the rotary wheel mechanism 3 and the fan-shaped brush 5. In addition, the arrangement position of the rotating wheel mechanism 3 is adjustable, so as to flexibly adjust the arrangement position of the rotating wheel mechanism 3 according to different tube thicknesses of the tube blank 7 .

[0038] The spinning wheel mechanism 3 is composed of a spinning wheel 29, on which a plurality of bolt mounting holes 21 arranged along the same circumference are provided. The spinning wheel 29 is matched and connected with a spinning wheel connecting protrusion 34 provided on the end surface of the device flange 10 through a spinning wheel connecting groove 36 provided on its end surface, and the spinning wheel 29 is connected with a corresponding bolt connecting screw hole 18 provided on the device flange 10 through a connecting bolt 12 provided in the bolt mounting hole 21. An inter-roller insulating gasket 32 ​​is provided between the spinning wheel 29 and the device flange 10, and a spinning wheel gasket matching hole 35 for avoiding the spinning wheel connecting protrusion 34 is provided in the middle of the inter-roller insulating gasket 32. A spinning wheel groove insulating gasket 33 is arranged in the spinning wheel connection groove 36 of the spinning wheel 29, a spinning wheel cover plate 30 is also arranged on the front side of the spinning wheel 29, and a spinning wheel cover insulating gasket 31 is also arranged between the spinning wheel cover plate 30 and the spinning wheel 29; and according to specific use needs, an insulating sleeve and an insulating gasket can be respectively arranged between the connecting bolt 12 and the bolt mounting hole 21, and between the connecting bolt 12 and the spinning wheel cover plate 30. Thus, the spinning wheel 29 and the device flange 10 are assembled and connected together through the cooperation of the spinning wheel connection groove 36 and the spinning wheel connection protrusion 34, and the connection is tightened by the connecting bolt 12, so that the spinning wheel mechanism 3 can be passively rotated with the rotation of the mandrel mechanism 1, which is convenient for the heating and spinning of the pipe; and the insulating gaskets arranged between the various connection parts are used to effectively prevent the spinning equipment from being electrified.

[0039] The method for performing pipe spinning using the electrically assisted heating pipe spinning device comprises the following steps: Step 1: sleeve the tube blank 7 to be processed onto the forming mandrel 8 of the mandrel mechanism 1 , and make the mandrel connecting concave teeth 23 at the rear end of the tube blank 7 match and assemble with the tube blank connecting convex teeth 22 at the root of the forming mandrel 8 .

[0040] Step 2: After the tube blank 7 and the mandrel mechanism 1 are assembled in place, the tail top mechanism 2 is pushed toward the end of the mandrel mechanism 1 so that the top of the mandrel tail top 24 of the tail top mechanism 2 is in contact with the tail top positioning groove 16 at the end of the forming mandrel 8 of the mandrel mechanism 1.

[0041] Step 3: After the tail push mechanism 2 presses the end of the mandrel mechanism 1 tightly, the arrangement position of the rotary wheel mechanism 3 is adjusted according to the diameter of the tube blank 7, and the three sets of rotary wheel mechanisms 3, which are spaced 120 degrees apart and evenly arranged on the same circumference, are pushed toward the processing position of the tube blank 7 sleeved outside the mandrel mechanism 1.

[0042] Step 4: Install two sets of telescopic support rods 39 in the support rod installation slots 40 of the upper support frame 4 and the lower support frame 6 respectively, and arrange the telescopic support rods 39 along the radial direction of the pipe blank 7, and let the fan-shaped brushes 5 and the conductive electrodes at the ends of the telescopic support rods 39 form sufficient and good contact with the outer wall of the pipe blank 7. The conductive electrodes are connected to the DC power supply through cables. The DC power supply adopts a high-frequency low-voltage power supply, and the low-voltage and high-current output voltage does not exceed 10V, and the DC current does not exceed 1000A; the fan-shaped brushes 5 on the upper and lower support frames 6 and the annular parts on the pipe blank 7 surrounded by them form a ring loop.

[0043] Step 5: Set an infrared thermal imaging thermometer on the outside of the tube spinning device to monitor the temperature of the processing area between the two sets of fan-shaped brushes 5 and the tube blank 7, and use the thermometer to determine the range of the temperature uniform area on the tube blank 7 to determine the distance of the first feeding of the rotating wheel mechanism 3.

[0044] Step 6: When the processing area of ​​the tube blank 7 reaches the predetermined temperature, turn off the DC power supply and start the mandrel mechanism 1 to drive the tube blank 7 to rotate actively. Then, drive the rotary wheel feeding bracket to feed the rotary wheel mechanism 3 forward, and at the same time, the spinning wheels 29 on each group of rotary wheel mechanisms 3 rotate passively, so as to perform spinning forming on the processing area of ​​the heated tube blank 7.

[0045] Step 7: When the temperature measuring instrument detects that the feeding distance of the rotary wheel feeding bracket is about to reach the unheated area, the feeding of the rotary wheel feeding bracket is stopped, and then the coolant is sprayed to cool down the tube blank 7. After the tube blank 7 is cooled, the DC power supply is started again, and the above steps of heating the processing area of ​​the tube blank 7 and spinning the rotary wheel mechanism 3 forward are repeated until the spinning forming process of the entire tube blank is completed.

Claims

1. An electrically assisted heating pipe spinning device, comprising a mandrel mechanism (1), characterized in that: The mandrel mechanism (1) is sleeved with a tube blank (7), and a tail top mechanism (2) is coaxially arranged at the extended end of the mandrel mechanism (1). An upper support frame (4) and a lower support frame (6) are arranged above and below the mandrel mechanism (1), respectively. The upper support frame (4) and the lower support frame (6) are both provided with fan-shaped brushes (5) for contacting the outer wall of the tube blank (7), and the fan-shaped brushes (5) are provided with conductive electrodes for annularly heating the tube blank (7), and the conductive electrodes are connected to a DC power supply through cables; and a plurality of groups of rotary wheel mechanisms (3) for forming the tube blank (7) are also arranged on the periphery of the outer side of the mandrel mechanism (1), and the rotary wheel mechanisms (3) are connected to a rotary wheel feeding bracket, and the upper support frame (4) and the lower support frame (6) are also respectively connected to the rotary wheel feeding bracket.

2. The electrically assisted heating pipe spinning forming device according to claim 1 is characterized in that: The spindle mechanism (1) comprises a forming spindle (8), one end of the forming spindle (8) is provided with a tail top positioning groove (16), the other end of the forming spindle (8) is provided with a spindle tail flange (9), the spindle tail flange (9) is provided with a plurality of groups of bolt mounting holes (21), the spindle tail flange (9) is matched and connected with a device flange protrusion (17) on the end face of the device flange (10) through a spindle flange groove (20) provided on its end face, and the spindle tail flange (9) is connected with a corresponding bolt (12) provided on the device flange (10) through a connecting bolt (12) provided in the bolt mounting hole (21). The mandrel tail flange (9) and the device flange (10) are connected by a bolt connection screw hole (18); an inter-flange insulating gasket (14) is arranged between the mandrel tail flange (9) and the device flange (10), and a plurality of flange gasket openings (19) are arranged on the outer periphery of the inter-flange insulating gasket (14); a flange groove insulating gasket is arranged in the mandrel flange groove (20) of the mandrel tail flange (9); a mandrel cover plate (11) is also arranged on the front side of the mandrel tail flange (9), the mandrel cover plate (11) is sleeved on the outer side of the pipe blank (7), and a mandrel cover insulating gasket (13) is also arranged between the mandrel cover plate (11) and the mandrel tail flange (9).

3. The electrically assisted heating pipe spinning forming device according to claim 2 is characterized in that: The root of the forming mandrel (8) and the front side of the mandrel tail flange (9) are provided with tube blank connection convex teeth (22), and correspondingly, the rear end of the tube blank (7) is provided with mandrel connection concave teeth (23) for matching and connecting with the tube blank connection convex teeth (22).

4. The electrically assisted heating pipe spinning forming device according to claim 1, characterized in that: The tail top mechanism (2) comprises a spindle tail top (24), one end of which is provided with a top for connecting to the end of the spindle mechanism (1), and the other end of which is provided with a tail top flange (25), on which are provided a plurality of groups of bolt mounting holes (21), the tail top flange (25) being matched and connected with a device flange protrusion (17) on the end face of the device flange (10) through a tail top flange groove (28) provided on its end face, and the tail top flange (25) being aligned with the device flange (10) through a connecting bolt (12) provided in the bolt mounting hole (21). The tail top flange (25) and the device flange (10) are connected to each other by bolt connection screw holes (18) to be set; an inter-flange insulating gasket (14) is arranged between the tail top flange (25) and the device flange (10), and a plurality of flange gasket openings (19) are arranged on the outer periphery of the inter-flange insulating gasket (14); a flange groove insulating gasket is arranged in the tail top flange groove (28) of the tail top flange (25); a tail top cover plate (26) is further arranged on the front side of the tail top flange (25), the tail top cover plate (26) is sleeved on the outer side of the core shaft tail top (24), and a tail top cover insulating gasket (27) is further arranged between the tail top cover plate (26) and the tail top flange (25).

5. The electrically assisted heating pipe spinning forming device according to claim 1, characterized in that: The spinning wheel mechanism (3) comprises a spinning wheel (29), on which a plurality of groups of bolt mounting holes (21) are arranged. The spinning wheel (29) is matched and connected with a spinning wheel connecting protrusion (34) arranged on the end surface of the device flange (10) through a spinning wheel connecting groove (36) arranged on the end surface of the spinning wheel (29), and the spinning wheel (29) is connected with a corresponding bolt connecting screw hole (18) arranged on the device flange (10) through a connecting bolt (12) arranged in the bolt mounting hole (21). An inter-wheel insulating gasket (32) is provided between the spinning wheel (29) and the device flange (10), and a spinning wheel gasket matching hole (35) is provided in the middle of the inter-wheel insulating gasket (32); a spinning wheel groove insulating gasket (33) is provided in the spinning wheel connecting groove (36) of the spinning wheel (29), a spinning wheel cover plate (30) is also provided on the front side of the spinning wheel (29), and a spinning wheel cover insulating gasket (31) is also provided between the spinning wheel cover plate (30) and the spinning wheel (29).

6. The electrically assisted heating pipe spinning forming device according to claim 1, characterized in that: The number of the rotating wheel mechanisms (3) is three groups, and the three groups of rotating wheel mechanisms (3) are respectively spaced 120 degrees apart and evenly arranged on the same circumference; the arrangement position of the rotating wheel mechanisms (3) is adjustable.

7. The electrically assisted heating pipe spinning forming device according to claim 1, characterized in that: The upper support frame (4) and the lower support frame (6) have the same structure. Both the upper support frame (4) and the lower support frame (6) include an L-shaped support frame (37). A telescopic support rod (39) arranged radially along the pipe blank (7) is provided at the end of the L-shaped support frame (37). One end of the telescopic support rod (39) is arranged in a support rod installation slot (40) at the end of the L-shaped support frame (37). The bottom end of the support rod installation slot (40) is closed and provided with an installation slot end cover (38). A compression spring (41) is provided between the bottom end of the support rod installation slot (40) and the end of the telescopic support rod (39). A fan-shaped brush (5) is provided at the other end of the telescopic support rod (39), and a brush insulation gasket (42) is also provided between the fan-shaped brush (5) and the end of the telescopic support rod (39).

8. The electrically assisted heating pipe spinning forming device according to claim 1 is characterized in that: The fan-shaped brush (5) is made of graphite material or copper material.

9. The electrically assisted heating pipe spinning forming device according to claim 1, characterized in that: Brush devices for removing wear debris are respectively provided on both sides of the fan-shaped brush (5).

10. A method for pipe spinning using the electrically assisted heating pipe spinning device according to claim 1, characterized in that: The steps include: Step 1: sleeve a tube blank (7) to be processed onto a forming mandrel (8) of a mandrel mechanism (1), and make the mandrel connecting concave teeth (23) at the rear end of the tube blank (7) and the tube blank connecting convex teeth (22) at the root of the forming mandrel (8) cooperate and assemble; Step 2: After the tube blank (7) and the mandrel mechanism (1) are assembled in place, the tail top mechanism (2) is pushed toward the end of the mandrel mechanism (1) so that the top of the mandrel tail top (24) of the tail top mechanism (2) is in contact with the tail top positioning groove (16) at the end of the forming mandrel (8) of the mandrel mechanism (1); Step 3: After the tail push mechanism (2) is pressed against the end of the mandrel mechanism (1), the arrangement position of the rotary wheel mechanism (3) is adjusted according to the diameter of the tube blank (7), and each set of rotary wheel mechanisms (3) is pushed toward the processing position of the tube blank (7) sleeved outside the mandrel mechanism (1); Step 4: Install two sets of telescopic support rods (39) in the support rod installation slots (40) of the upper support frame (4) and the lower support frame (6), respectively, and arrange the telescopic support rods (39) along the radial direction of the pipe blank (7), and allow the fan-shaped brushes (5) and the conductive electrodes at the ends of the telescopic support rods (39) to form sufficient and good contact with the outer wall of the pipe blank (7), the conductive electrodes are connected to the DC power supply through cables, and the fan-shaped brushes (5) on the upper and lower support frames (6) and the annular parts on the pipe blank (7) formed by them form a ring loop; Step 5: an infrared thermal imaging thermometer is arranged outside the tube spinning forming device to monitor the temperature of the processing area between the two sets of fan-shaped brushes (5) and the tube blank (7), and the thermometer is used to determine the range of the temperature uniform area on the tube blank (7) to determine the initial feeding distance of the rotary wheel mechanism (3); Step 6: When the processing area of ​​the tube blank (7) reaches a predetermined temperature, the DC power supply is turned off, and the mandrel mechanism (1) is started to drive the tube blank (7) to actively rotate. Then, the rotary wheel feed bracket is driven to feed the rotary wheel mechanism (3) forward. At the same time, the spinning wheels (29) on each group of rotary wheel mechanisms (3) are passively rotated, thereby spinning the processing area of ​​the heated tube blank (7); Step 7: When the temperature measuring instrument detects that the feeding distance of the rotary wheel feeding bracket is about to reach the unheated area, the feeding of the rotary wheel feeding bracket is stopped, and then the cooling liquid is sprayed to cool the tube blank (7); after the tube blank (7) is cooled, the DC power supply is started again, and the above steps of heating the processing area of ​​the tube blank (7) and spinning the rotary wheel mechanism (3) forward are repeated until the spinning forming process of the entire tube blank is completed.

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