JP2015208766A - Spinning molding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spinning molding device capable of continuously processing a stepped plate material with a processing tool from a thin part to a thick part.SOLUTION: A spinning molding device 1 includes a receiving tool 22, a rotary shaft 21, a processing tool 4, and a heater 5 for a plate material 9 which has an inward wall surface, facing radially inward, formed on its reverse surface 9b. The receiving tool 22 supports a center part 96 of the plate material 9, and the processing tool 4 presses a top surface 9a of the plate material 9 in a molding area of the plate material 9 across the inward wall surface while moved in a radial direction of the rotary shaft 21. A heater 5 is moved to be positioned on the same circumference with the processing tool 4. The heater 5 includes a first coil part which locally heats the plate material 9 through induction heating while opposed to the reverse surface 9b of the plate material 9, and a second coil part which locally heats the plate material 9 through induction heating while opposed to the inward wall surface of the plate material 9.

Description

  The present invention relates to a spinning molding apparatus that molds a plate material into a desired shape while rotating the plate material.

  2. Description of the Related Art Conventionally, there is known a spinning molding apparatus that deforms a plate by pressing a processing tool against the plate while rotating the plate. Such a spinning molding apparatus usually has a mandrel (molding die) attached to a rotating shaft, and molding is performed by pressing a plate material against the mandrel by a processing tool.

  In recent years, a spinning molding apparatus that performs spinning molding while locally heating a plate material has been proposed. For example, Patent Document 1 discloses a spinning molding apparatus that heats a portion pressed against a mandrel by a spatula (processing tool) in a plate material by high-frequency induction heating as a spinning molding apparatus for a titanium alloy.

  By the way, the inventors of the present invention have found that if a plate material is locally heated by induction heating, the plate material can be deformed in the air according to the final shape without using a mandrel. From this point of view, the applicant of the present application has previously proposed a spinning forming apparatus using a receiving jig that supports the center of the plate material instead of the mandrel (see Patent Document 2). In this spinning forming apparatus, a specific portion (deformation target portion) in the forming region of the plate material is heated by the heater and pressed by the processing tool at a position away from the receiving jig.

JP 2011-218427 A International Publication No. 2014/024384

  By the way, as a board | plate material, it is also possible to use not only a flat disk-shaped thing but the board | substrate with a level | step difference of the shape which a peripheral part protrudes on the back side on the opposite side to a processing tool, for example. However, when the stepped plate material is used, the heat capacity in the thickness direction of the plate material is different between the thick portion at the peripheral portion and the thin portion inside thereof. For this reason, even if the heater is moved from directly below the thin portion to just below the thick portion, the thick portion cannot be immediately heated to a desired temperature. Therefore, measures such as temporarily interrupting the pressing of the processing tool are required from the processing of the thin portion to the processing of the thick portion.

  Then, an object of this invention is to provide the spinning shaping | molding apparatus which can perform the continuous process with a processing tool from a thin part to a thick part with respect to a board | plate with a level | step difference.

  In order to solve the above-mentioned problem, the spinning molding apparatus of the present invention is directed to a plate material in which at least one inward wall surface facing radially inward is formed on the back surface, and a molding region straddling the inward wall surface in the plate material. A spinning forming apparatus for forming into a taper shape, a receiving jig for supporting a central portion of the plate material, a rotating shaft to which the receiving jig is attached, and being moved radially outward of the rotating shaft A processing tool that presses the surface of the plate material in the molding region, and a heater that is moved so as to be positioned on the same circumference as the processing tool, and guides the plate material while facing the back surface of the plate material A first coil portion that locally heats by heating, and a second coil portion that locally heats the plate member by induction heating while facing the inward wall surface of the plate member. Comprising a heater, and wherein the.

  According to said structure, the thick part of the outer side of the inward wall surface in a board | plate material can be preliminarily heated with a 2nd coil part, before heating with a 1st coil part. Thereby, even if a heater is moved from right under the thin part inside the inner wall surface to right under the thick part, the thick part can be immediately heated to a desired temperature. Therefore, continuous processing with a processing tool can be performed from a thin portion to a thick portion.

  Each of the first coil portion and the second coil portion may have a double arc shape extending in the circumferential direction of the rotating shaft. According to this structure, full-scale heating of a board | plate material can be performed continuously in the rotation direction of a board | plate material, and favorable moldability can be obtained. Moreover, the preliminary heating with respect to the thick part of a board | plate material can also be performed continuously in the rotation direction of a board | plate material.

  For example, the first coil portion has a pair of first arc portions spaced apart from each other in the radial direction of the rotating shaft, and the second coil portion is a pair of second arcs separated from each other in the axial direction of the rotating shaft. You may have a circular arc part.

  The spinning molding apparatus includes a radial movement mechanism that moves the heater in a radial direction of the rotary shaft, an axial movement mechanism that moves the heater in the axial direction of the rotary shaft, and the processing tool includes the processing tool. Immediately before reaching the position corresponding to the inward wall surface, the heater is located outside the inward wall surface on the back surface from a position close to the low step surface located on the inner side of the inward wall surface on the back surface of the plate member. And a control device that controls the radial movement mechanism and the axial movement mechanism so as to move to a position close to the high step surface. According to this structure, the heating suitable for the continuous process from a thin part to a thick part can be performed.

  In the above spinning molding apparatus, the first AC power circuit connected to the first coil part, the second AC power circuit connected to the second coil part, and the processing tool correspond to the inward wall surface. A controller for controlling the second AC power supply circuit so that application of an AC voltage to the second coil unit is started immediately before reaching the position. According to this configuration, preliminary heating can be performed only when necessary, and power consumption can be suppressed.

  On the back surface of the plate member, at least one outward wall surface that forms an annular groove with the inward wall surface may be formed. According to this configuration, it is possible to obtain a molded product having a thick central portion and an outer peripheral portion and a thin intermediate portion.

  The spinning molding apparatus includes a radial movement mechanism that moves the heater in a radial direction of the rotary shaft, an axial movement mechanism that moves the heater in the axial direction of the rotary shaft, and the processing tool includes the processing tool. Immediately before reaching the position corresponding to the outward wall surface, the heater is located outside the outward wall surface on the back surface from a position close to the high step surface located on the inside of the outward wall surface on the back surface of the plate member. And a controller that controls the radial movement mechanism and the axial movement mechanism so as to move to a position close to the low step surface. According to this configuration, it is possible to perform heating suitable for continuous processing from the thick part on the center side to the thin part.

  ADVANTAGE OF THE INVENTION According to this invention, a continuous process with a processing tool can be performed from a thin part to a thick part with respect to a stepped plate material.

It is a schematic block diagram of the spinning shaping | molding apparatus which concerns on one Embodiment of this invention. It is sectional drawing of the heater in the spinning shaping | molding apparatus shown in FIG. (A) And (b) is the top view and front view of a heater which are shown in FIG. 2, respectively. It is a fragmentary sectional view of the board | plate material before spinning shaping | molding. (A) And (b) is a figure which shows the position of the heater when changing a board | plate material in the vicinity of an outward wall surface. (A) And (b) is a figure which shows the position of a heater when changing a board | plate material in the vicinity of an inward wall surface. It is a fragmentary sectional view of the molded article finally obtained. It is sectional drawing of the heater of a modification.

  FIG. 1 shows a spinning molding apparatus 1 according to an embodiment of the present invention. This spinning forming apparatus 1 is intended for a stepped plate member 9 having a thin portion 97 and a thick portion 98 as shown in FIG.

  The plate 9 is symmetric about the central axis 90 and has a circular outline in plan view. A circular through hole 99 is provided at the center of the plate member 9. The through hole 99 is used for positioning with respect to a receiving jig 22 described later, for example. However, the plate material 9 is not necessarily provided with the through hole 99. Although the material of the board | plate material 9 is not specifically limited, For example, it is a titanium alloy.

  More specifically, the plate member 9 has a flat surface 9a and a back surface 9b on which an inward wall surface 94 facing radially inward is formed. A first step surface (corresponding to a low step surface of the present invention) 93 located inside the inward wall surface 94 defines a thin portion 97 between the surface 9a and a second step surface located outside the inward wall surface 94. A stepped surface (corresponding to a high stepped surface of the present invention) 95 defines a thick portion 98 between the surface 9a. In the present embodiment, the inward wall surface 94 has a cylindrical shape parallel to the central axis 90, but may be tapered to inward or outward with respect to the central axis 90.

  In the present embodiment, an outward wall surface 92 that forms an annular groove with the inward wall surface 94 is also formed on the back surface 9 b of the plate member 9. A reference surface 91 (corresponding to a high step surface of the present invention) 91 located inside the outward wall surface 92 defines a central portion 96 that is a thick portion on the center side between the surface 9a. Although the outward wall surface 92 has a cylindrical shape parallel to the central axis 90 in the present embodiment, it may have a tapered shape that is inclined inward or outward with respect to the central axis 90.

  The above-described first step surface 93 is retreated from the reference surface 91 in the thickness direction of the plate 9 by the height of the outward wall surface 92, and the second step surface 95 is the height of the inward wall surface 94. Projecting from the first step surface 93 in the thickness direction of the plate 9. In the illustrated example, the thickness of the thick portion 98 is thicker than the thickness of the central portion 96, but the thickness of the thick portion 98 may be equal to or less than the thickness of the central portion 96. . Further, the outward wall surface 92 can be omitted, and the first step surface 93 may be located on the same plane as the reference surface 91.

  The shape of the plate material 9 in this embodiment is intended to obtain a molded product having a shape similar to the axially symmetric component 8 as shown in FIG. 4 as a final molded product (see FIG. 7). If the plate member 9 has the outward wall surface 92 as in the present embodiment, a molded product having a thick central portion and an outer peripheral portion and a thin intermediate portion can be obtained.

  A forming region R (see FIG. 4) straddling the inward wall surface 94 in the plate material 9 is formed into a tapered shape by the spinning forming apparatus 1. In the present embodiment, the inner end (that is, the molding start position) of the molding region R is positioned radially inward from the outward wall surface 92, and the outer end (that is, the molding end position) of the molding region R is the plate material 9. It is located on the outer peripheral surface. However, the inner end of the molding region R may be located radially outside the outward wall surface 92, and the outer end of the molding region R may be located in the middle of the thick portion 98.

  Returning to FIG. 1, the spinning forming apparatus 1 includes a rotating shaft 21 that rotates the plate member 9, a receiving jig 22 that is interposed between the rotating shaft 21 and the plate member 9, and a fixing jig 31. The receiving jig 22 is attached to the rotary shaft 21 to support the center portion 96 of the plate material 9, and the fixing jig 31 holds the plate material 9 together with the receiving jig 22. Furthermore, the spinning molding apparatus 1 includes a processing tool 4 disposed on the front side of the plate material 9 and a heater 5 disposed on the back side of the plate material 9.

  The axial direction of the rotating shaft 21 is a vertical direction in this embodiment. However, the axial direction of the rotating shaft 21 may be a horizontal direction or an oblique direction. The lower part of the rotating shaft 21 is supported by the base 11, and the rotating shaft 21 is rotated by a motor (not shown). The upper surface of the rotating shaft 21 is flat, and a receiving jig 22 is fixed to the upper surface.

  The receiving jig 22 has a size that fits in a circle defined by the inner end of the forming region R of the plate material 9. For example, when the receiving jig 22 has a disk shape, the diameter of the receiving jig 22 is equal to or less than the diameter of the circle defined by the inner end of the molding region R. Further, unlike the conventional mandrel, the plate member 9 is not deformed by being pressed against the radially outward side surface of the receiving jig 22.

  The fixing jig 31 is attached to a pressure rod 32, and the pressure rod 32 is rotatably supported by a support portion 33. The support portion 33 is driven in the vertical direction by the drive portion 34. The drive unit 34 is attached to the frame 12 disposed above the rotary shaft 21. However, the fixing jig 31 may be omitted, and the plate material 9 may be received and fixed directly to the jig 22 by, for example, bolts.

  The processing tool 4 presses the surface 9 a of the plate material 9 in the molding region R while being moved radially outward of the rotary shaft 21. In the present embodiment, a roller that rotates following the rotation of the plate 9 is used as the processing tool 4. However, the processing tool 4 is not limited to a roller, and may be a spatula, for example.

  More specifically, the processing tool 4 is moved in the radial direction of the rotary shaft 21 by the first radial movement mechanism 14, and the axis of the rotary shaft 21 through the radial movement mechanism 14 by the first axial movement mechanism 13. Moved in the direction. The first axial movement mechanism 13 extends so as to bridge the base 11 and the frame 12 described above.

  The heater 5 locally heats the plate material 9 and is moved so as to be positioned on the same circumference as the processing tool 4. Here, “on the same circumference” means that the center of the heater 5 and the center of the processing tool 4 are within a ring-shaped range having a certain width around the central axis of the rotary shaft 21, Part of the heater 5 and the processing tool 4 need not overlap in the circumferential direction of the rotating shaft 21.

  More specifically, the heater 5 is moved in the radial direction of the rotary shaft 21 by the second radial movement mechanism 16, and the axis of the rotary shaft 21 through the radial movement mechanism 16 by the second axial movement mechanism 15. Moved in the direction. The second axial movement mechanism 15 extends so as to bridge the base 11 and the frame 12 described above. The heater 5 is supported by a support member 55 extending from the second radial movement mechanism 16.

  The relative position of the heater 5 and the processing tool 4 in the circumferential direction of the rotating shaft 21 is not particularly limited. For example, the heater 5 may be disposed at a position directly opposite to the processing tool 4 with the rotating shaft 21 interposed therebetween, or may be disposed at a position shifted from the position directly opposite to the processing tool 4 (for example, in the circumferential direction of the rotating shaft 21). (Position 90 degrees away from).

  The moving mechanisms 13 and 14 for the processing tool 4 and the moving mechanisms 15 and 16 for the heater 5 are controlled by the control device 7. The control device 7 stores in advance a program for forming the plate material 9 into a desired shape. The control device 7 moves the moving mechanisms 13 and 14 for the processing tool 4 and the heater 5 according to the program. The mechanisms 15 and 16 are controlled. For example, in order to control the position of the heater 5, a displacement meter (not shown) that measures the distance to the deformation target site in the forming region R of the plate material 9 may be attached to the heater 5. .

  As shown in FIG. 2 and FIGS. 3A and 3B, the heater 5 includes an arcuate coil base 51 extending in the circumferential direction of the rotating shaft 21 and a first coil disposed above the coil base 51. Part 52 and the 2nd coil part 53 arranged on the diameter direction outside of coil stand 51 is included. In the present embodiment, a layout in which the first coil portion 52 and the second coil portion 53 partially overlap in the axial direction of the rotary shaft 21 is employed. However, as shown in FIG. 8, a layout in which the first coil portion 52 and the second coil portion 53 partially overlap in the radial direction of the rotary shaft 21 may be employed.

  The first coil portion 52 locally heats the plate 9 by induction heating while facing the back surface 9b of the plate 9 (in this embodiment, the reference surface 91, the first step surface 93, and the second step surface 95). It is. The second coil portion 53 locally heats the plate 9 by induction heating while facing the inward wall surface 94 of the plate 9. In the present embodiment, each of the first coil portion 52 and the second coil portion 53 has a double arc shape extending in the circumferential direction of the rotating shaft 21.

  Specifically, the first coil portion 52 has a pair of first arc portions 61 and 62 that are separated from each other in the radial direction of the rotating shaft 21. In the present embodiment, the inner first arc portion 61 is divided into two arc pieces 61a, and one end of both arc pieces 61a, which are both ends of the first arc portion 61, is formed on the outer first arc by the hairpin portion. The unit 62 is connected. The other ends of the two arc pieces 61 a adjacent to each other are connected to the first AC power supply circuit 81 via a pair of lead portions 83. The lead portion 83 and the first coil portion 52 are configured by a single conducting tube. A coolant flows through the inside of the conducting pipe.

  Further, on the upper surface of the coil base 51, the two first cores 63 that wrap the inner first arc portion 61 (exactly two arc pieces 61a) from below and the outer first arc portion 62 are provided below. One second core 64 is disposed so as to envelop from. These cores 63 and 64 are for collecting magnetic flux generated around the first arc portions 61 and 62.

  The first AC power supply circuit 81 applies an AC voltage to the first coil unit 52 via the lead unit 83. The frequency of the AC voltage is not particularly limited, but is preferably a high frequency of 5 k to 400 kHz. That is, the induction heating by the first coil unit 52 is desirably high frequency induction heating. For example, the spinning molding apparatus 1 is provided with a thermometer that measures the temperature of the surface 9 a of the plate 9 on the same circumference as the processing tool 4. The first AC power supply circuit 81 is controlled by the control device 7 so that the temperature measured by the thermometer becomes a constant temperature.

  The second coil portion 53 has a pair of second arc portions 65 and 66 that are separated from each other in the axial direction of the rotary shaft 21. In the present embodiment, the lower second arc portion 66 is divided into two arc pieces 66a, and one end of each arc piece 66a, which is both ends of the second arc portion 66, is located on the upper second side by the hairpin portion. The arc portion 65 is connected. The other ends of the two arc pieces 66 a close to each other are connected to the second AC power supply circuit 82 via a pair of lead portions 84. The lead portion 84 and the second coil portion 53 are configured by a single conducting tube. A coolant flows through the inside of the conducting pipe.

  Further, on the side surface of the coil base 51, there is one first core 67 that wraps the upper second arc portion 65 from the radially inner side, and a lower second arc portion 66 (more precisely, two arc pieces 66a). ) Are disposed from the inside in the radial direction. These cores 67 and 68 are for collecting magnetic flux generated around the second arc portions 65 and 66.

  The second AC power supply circuit 82 applies an AC voltage to the second coil unit 53 via the lead unit 84. The frequency of the AC voltage is not particularly limited, but is preferably a high frequency of 5 k to 400 kHz. That is, it is desirable that the induction heating by the second coil portion 53 is high frequency induction heating. For example, the second AC power supply circuit 82 is controlled by the control device 7 so that an AC voltage is applied to the second coil portion 53 only when the second coil portion 53 comes close to the inward wall surface 94.

  Next, an example of movement and heating of the heater 5 will be described with reference to FIGS. 4-7 has shown the state of the board | plate material 9 when spinning forming is performed in time series. 5A and 5B and FIGS. 6A and 6B, the pressing position of the processing tool 4 is indicated by a thick arrow.

  As shown in FIG. 4, before the spinning molding is started, for example, the heater 5 is disposed at a position close to the reference surface 91 of the back surface 9b at the inner end of the molding region R (in other words, directly below the center portion 96). Is done. In this state, the first AC power supply circuit 81 is controlled by the control device 7, and an AC voltage is applied to the first coil portion 52 of the heater 5. Thereby, the full-scale heating of the board | plate material 9 is performed. When the plate 9 is heated to a desired temperature at the inner end of the molding region R by the first coil portion 52, the processing tool 4 is moved radially outward of the rotary shaft 21 while being pressed against the surface 9a of the plate 9. It is done.

  As shown in FIGS. 5A and 5B, the heater 5 approaches the reference surface 91 immediately before the processing tool 4 reaches a position corresponding to the outward wall surface 92 (that is, directly above). It is moved from a position (in other words, directly below the center portion 96) to a position close to the first step surface 93 (in other words, directly below the thin portion 97).

  Thereafter, as shown in FIGS. 6A and 6B, immediately before the processing tool 4 reaches a position corresponding to the inward wall surface 94 (that is, directly above), the heater 5 has a first step surface. 93 is moved from a position close to 93 to a position close to the second step surface 95 (in other words, directly below the thick portion 98).

  Further, immediately before the processing tool 4 reaches a position corresponding to the inward wall surface 94, the second AC power supply circuit 82 is controlled by the control device 7, and the AC voltage to the second coil unit 53 of the heater 5 is controlled. Application is started. Thereby, the thick part 98 is preliminarily heated from the inside in the radial direction. Application of the alternating voltage to the second coil part 53 is stopped when the heater 5 is moved directly below the thick part 98.

  The pressing by the processing tool 4 and the heating by the first coil portion 52 of the heater 5 are performed up to the outer end of the forming region R. Thereby, a molded product as shown in FIG. 7 is obtained.

  As described above, in the spinning forming apparatus 1 of the present embodiment, the thick portion 98 of the plate material 9 is preliminarily heated by the second coil portion 53 before being fully heated by the first coil portion 52. Can do. Thereby, even if the heater 5 is moved from directly below the thin portion 97 to directly below the thick portion 98, the thick portion 98 can be immediately heated to a desired temperature. Therefore, continuous processing by the processing tool 4 from the thin portion 97 to the thick portion 98 can be performed.

  Moreover, in this embodiment, since the 1st coil part 52 is a double circular arc shape, the full-scale heating of the board | plate material 9 can be performed continuously in the rotation direction of the board | plate material 9, and favorable moldability is obtained. Can do. Furthermore, since the second coil portion 53 is also in a double arc shape, preliminary heating of the thick portion 98 of the plate material 9 can be continuously performed in the rotation direction of the plate material 9.

  In the present embodiment, the heater 5 is moved from directly below the thin portion 97 to immediately below the thick portion 98 immediately before the processing tool 4 reaches directly above the inward wall surface 94, so that the thickness from the thin portion 97 is increased. Heating suitable for continuous processing up to the meat part 98 can be performed.

  Furthermore, since the application of the alternating voltage to the second coil portion 53 is started immediately before the processing tool 4 reaches directly above the inward wall surface 94, preliminary heating can be performed only when necessary. , Can reduce power consumption.

  Further, in the present embodiment, the heater 5 is moved from directly below the center portion 96 to immediately below the thin portion 97 immediately before the processing tool 4 reaches directly above the outward wall surface 92, so that the thick portion on the center side. Heating suitable for continuous processing from the central portion 96 to the thin-walled portion 97 can be performed.

(Other embodiments)
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  For example, in the said embodiment, although the 1st circular arc part 61 inside the 1st coil part 52 of the heater 5 was divided | segmented into the two circular arc pieces 61a, the outer side 1st circular arc part 62 is divided into two circular arc pieces. A pair of lead portions 83 may be connected to these arc pieces.

  Similarly, in the said embodiment, although the 2nd circular arc part 66 of the lower side of the 2nd coil part 53 of the heater 5 was divided | segmented into the two circular arc pieces 66a, the upper 2nd circular arc part 65 is two circular arcs. It may be divided into pieces, and a pair of lead portions 84 penetrating the coil base 51 may be connected to these arc pieces.

  Moreover, the 1st coil part 52 and the 2nd coil part 53 do not necessarily need to be double circular arc shape. For example, the heater 5 may have a plurality of circular first coil portions arranged in an arc shape, or may have a plurality of circular second coil portions arranged in a radial shape. . Moreover, the heater 5 may have only one circular first coil part and one circular second coil part. Furthermore, it is also possible to combine the first coil portion and the second coil portion having different configurations.

  Moreover, the 1st coil part 52 and the 2nd coil part 53 do not necessarily need to be connected to a separate AC power supply circuit, and may be connected to the same AC power supply circuit. In this case, for example, one of the lead parts 83 and 84 is eliminated so that the current flows in series in the first coil part 52 and the second coil part 53, and the first coil part 52 and the second coil part 53 are paired. You may connect by a relay part.

  Further, the number of inward wall surfaces 94 is not necessarily one, and may be plural. Furthermore, a plurality of outward wall surfaces 92 may be formed on the back surface 9 b of the plate material 9. For example, a plurality of inward wall surfaces 94 and a plurality of outward wall surfaces 92 may be formed stepwise on both sides of one annular groove in the radial direction of the rotating shaft 21. Alternatively, a plurality of pairs of inward wall surfaces 94 and outward wall surfaces 92 facing each other may be formed so that a plurality of annular grooves are arranged in the radial direction of the rotating shaft 21. Furthermore, combinations thereof are also possible.

  The present invention is useful when spinning a plate made of various materials.

DESCRIPTION OF SYMBOLS 1 Spinning shaping | molding apparatus 13,15 Axial direction moving mechanism 14,16 Radial direction moving mechanism 21 Rotating shaft 22 Receiving jig 4 Processing tool 5 Heater 52 1st coil part 53 2nd coil part 61,62 1st circular arc part 65, 66 2nd circular arc part 7 Control apparatus 81 1st alternating current power supply circuit 82 2nd alternating current power supply circuit 9 Plate material 9a Front surface 9b Back surface 91 Reference surface (high step surface)
92 outward wall surface 93 first step surface (low step surface)
94 Inward wall surface 95 Second step surface (high step surface)
96 Central part 97 Thin part 98 Thick part

Claims (7)

A spinning molding apparatus that targets a plate material in which at least one inward wall surface facing radially inward is formed on the back surface, and forms a molding region in a taper shape across the inward wall surface of the plate material,
A receiving jig that supports the center of the plate,
A rotating shaft to which the receiving jig is attached;
A processing tool for pressing the surface of the plate material in the molding region while being moved radially outward of the rotating shaft;
A heater that is moved so as to be positioned on the same circumference as the processing tool, the first coil portion that locally heats the plate material by induction heating while facing the back surface of the plate material, and the plate material A second coil portion that locally heats the plate material by induction heating while facing the inward wall surface of
A spinning molding apparatus.   2. The spinning molding apparatus according to claim 1, wherein each of the first coil portion and the second coil portion has a double arc shape extending in a circumferential direction of the rotating shaft. The first coil portion has a pair of first arc portions spaced apart from each other in the radial direction of the rotating shaft,
The spinning molding apparatus according to claim 2, wherein the second coil portion includes a pair of second arc portions spaced apart from each other in the axial direction of the rotating shaft. A radial movement mechanism for moving the heater in the radial direction of the rotary shaft;
An axial movement mechanism for moving the heater in the axial direction of the rotary shaft;
Immediately before the processing tool reaches a position corresponding to the inward wall surface, the heater faces inward on the back surface from a position close to a low step surface located inside the inward wall surface on the back surface of the plate member. A control device for controlling the radial movement mechanism and the axial movement mechanism so as to move to a position close to the high step surface located outside the wall surface;
The spinning molding apparatus according to claim 1, comprising: A first AC power supply circuit connected to the first coil unit;
A second AC power supply circuit connected to the second coil section;
A control device that controls the second AC power supply circuit so that application of an AC voltage to the second coil portion is started immediately before the processing tool reaches a position corresponding to the inward wall surface;
The spinning molding apparatus according to claim 1, comprising:   The spinning molding apparatus according to any one of claims 1 to 5, wherein at least one outward wall surface that forms an annular groove with the inward wall surface is formed on the back surface of the plate member. A radial movement mechanism for moving the heater in the radial direction of the rotary shaft;
An axial movement mechanism for moving the heater in the axial direction of the rotary shaft;
Immediately before the processing tool reaches a position corresponding to the outward wall surface, the heater faces outward on the back surface from a position close to a high step surface located inside the outward wall surface on the back surface of the plate member. A control device for controlling the radial movement mechanism and the axial movement mechanism so as to move to a position close to the low step surface located outside the wall surface;
The spinning molding apparatus according to claim 6, comprising:

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