Molding system and molding method

Abstract

A molding system is provided with: a molding device provided with a fluid supply unit for supplying a fluid to a heated metal pipe material, and a molding die for molding a molded article by bringing the expanded metal pipe material into contact with a molding surface; a processing unit for processing the molded article taken out from the molding die; and an oxide skin removal unit that removes oxide skin from the molded article that has been processed by the processing unit.

Description

[0001] This application is a divisional application of the Chinese invention patent application with the application date of March 5, 2021, application number 202180006516.5, and name “Molding System and Molding Method”. Technical Field

[0002] The invention relates to a molding system and a molding method. Background Art

[0003] In the past, as a molding system, there is a molding system described in Patent Document 1. The molding system includes a molding device. The molding device includes a fluid supply unit for supplying fluid to a heated metal tube material and a molding die for bringing the expanded metal tube material into contact with a molding surface to form a molded product. In this way, the molding system can bring the heated metal tube material into contact with the molding die to perform molding and quenching at the same time.

[0004] Previous technical literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2009-220141 Summary of the invention

[0007] Technical issues to be solved by the invention

[0008] Here, in the molding system described in the above-mentioned Patent Document 1, the heated metal tube material is quenched by the molding die while being molded, so that oxide scale is generated on the molded product. The molding system may be equipped with an oxide scale removal unit to remove such oxide scale from the molded product. It is required to improve the oxide scale removal efficiency by the oxide scale removal unit.

[0009] The present invention has been made to solve such a problem, and an object of the present invention is to provide a molding system and a molding method capable of improving the efficiency of scale removal.

[0010] Means for solving technical problems

[0011] The molding system involved in the present invention comprises: a molding device, comprising a fluid supply part for supplying fluid to a heated metal tube material and a molding die for making the expanded metal tube material contact with a molding surface to form a molded product; a processing part for processing the molded product taken out of the molding die; and an oxide scale removal part for removing oxide scale from the molded product processed by the processing part.

[0012] In the molding system, the molding device supplies fluid to the heated metal tube material to expand it and mold it using the molding die. Therefore, oxide scale is generated on the surface of the molded product. In response to this, the processing unit processes the molded product taken out of the molding die. And the oxide scale removal unit removes oxide scale from the molded product processed by the processing unit. In this way, the processing unit processes the molded product at the stage before removing the oxide scale. At this time, the processing unit can reduce the area of ​​the molded product to be removed compared to the molded product just after molding. Therefore, the oxide scale removal unit can perform oxide scale removal processing on the molded product whose area of ​​the oxide scale removal object has been reduced. Therefore, compared with the oxide scale removal processing performed on the molded product just after molding, the oxide scale removal unit can remove oxide scale in a shorter time with a smaller device. Therefore, the oxide scale removal efficiency can be improved.

[0013] The scale removal unit can remove scale from the molded product by causing particles to collide with the molded product. In this case, the scale removal unit can remove burrs, spatter, scum, etc. generated by processing or flatten the surface by causing particles to collide with the molded product.

[0014] The molding system may also include a cooling unit that actively cools the molded product taken out of the molding die, and the processing unit processes the molded product cooled by the cooling unit. For example, when the processing unit uses a laser to perform processing, it is necessary to lower the temperature of the molded product to room temperature in advance. Since the cooling unit actively cools the molded product, the time required for processing can be reduced compared to the case of natural heat dissipation.

[0015] The molding method comprises the following steps: a molding step in which a fluid is supplied to a heated metal tube material and the expanded metal tube material is brought into contact with a molding surface of a molding die, thereby molding a molded product; a processing step in which the molded product taken out of the molding die is processed; and an oxide scale removal step in which oxide scale is removed from the molded product processed in the processing step.

[0016] According to this molding method, the same effects as those of the above-mentioned molding system can be obtained.

[0017] Effects of the Invention

[0018] According to the present invention, a molding system and a molding method capable of improving the efficiency of oxide scale removal are provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram showing the structure of the molding system involved in the first embodiment.

[0020] Figure 2 It is a schematic diagram of a molding device 1 used in the molding system according to the present embodiment.

[0021] Figure 3 This is an enlarged cross-sectional view showing the state of the metal tube material and the molding die during blow molding.

[0022] Figure 4 It is a perspective view showing a state where laser processing is performed by a laser processing device.

[0023] Figure 5 It is a schematic diagram showing a state where sandblasting is performed by a sandblasting device.

[0024] Figure 6 It is a process diagram showing the molding method involved in the first embodiment.

[0025] Figure 7 It is a schematic structural diagram showing the structure of a molding system according to a second embodiment.

[0026] Figure 8 It is a schematic structural diagram showing the structure of a molding system involved in the third embodiment.

[0027] Fig. 9 It is a schematic diagram of a molding device according to a modified example.

[0028] Fig.10 (a) and (b) are diagrams showing an example of the structure around the gas supply nozzle. DETAILED DESCRIPTION

[0029] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In addition, in each of the drawings, the same or corresponding parts are denoted by the same reference numerals, and repeated descriptions are omitted.

[0030] [First embodiment]

[0031] Figure 1 1 is a schematic structural diagram showing the structure of the molding system 100 involved in the first embodiment. Figure 1 As shown, the molding system 100 includes a molding device 1, a laser processing device 70 (processing unit), and a sandblasting device 50 (oxidized scale removal unit).

[0032] The forming device 1 is a device for forming a heated metal material using a forming die. In this embodiment, a STAF forming device is used as the forming device 1, which supplies a fluid to the heated metal tube material so that the heated metal tube material contacts the forming surface of the forming die, thereby forming and quenching the heated metal tube material. Figure 2 , the detailed structure of the molding device 1 is described.

[0033] Figure 2 FIG. 1 is a schematic diagram of a molding device 1 used in a molding system 100 according to the present embodiment. Figure 2As shown, the molding device 1 is a device for molding a metal tube having a hollow shape by blow molding. In the present embodiment, the molding device 1 is arranged on a horizontal plane. The molding device 1 comprises a molding die 2, a drive mechanism 3, a holding portion 4, a heating portion 5, a fluid supply portion 6, a cooling portion 7 and a control portion 8. In addition, in the present specification, the metal tube material 40 (metal material) refers to a hollow object before the molding device 1 is completed. The metal tube material 40 is a tube material of hardenable steel. In addition, the extension direction of the metal tube material 40 during molding in the horizontal direction is sometimes referred to as the "length direction", and the direction orthogonal to the length direction is referred to as the "width direction".

[0034] The forming die 2 is a die for forming a metal tube material 40 into a metal tube 140, and includes a lower die 11 and an upper die 12 that are opposed to each other in the up-down direction. The lower die 11 and the upper die 12 are made of steel blocks. Concave portions for accommodating the metal tube material 40 are respectively provided on the lower die 11 and the upper die 12. When the lower die 11 and the upper die 12 are in close contact with each other (closed die state), each concave portion forms a space of a target shape for forming the metal tube material. Therefore, the surface of each concave portion becomes the forming surface of the forming die 2. The lower die 11 is fixed to a base 13 via a die seat, etc. The upper die 12 is fixed to a sliding member of the driving mechanism 3 via a die seat, etc.

[0035] The driving mechanism 3 is a mechanism for moving at least one of the lower mold 11 and the upper mold 12. Figure 2 In the embodiment, the driving mechanism 3 has a structure that moves only the upper mold 12. The driving mechanism 3 includes: a slide 21 that moves the upper mold 12 in a direction in which the lower mold 11 and the upper mold 12 are closed together; a pull-back cylinder 22 as an actuator that generates a force to pull the slide 21 upward; a main cylinder 23 as a driving source that lowers and pressurizes the slide 21; and a driving source 24 that applies driving force to the main cylinder 23.

[0036] The holding part 4 is a mechanism for holding the metal tube material 40 disposed between the lower die 11 and the upper die 12. The holding part 4 includes: a lower electrode 26 and an upper electrode 27 for holding the metal tube material 40 at one end side in the longitudinal direction of the forming die 2; and a lower electrode 26 and an upper electrode 27 for holding the metal tube material 40 at the other end side in the longitudinal direction of the forming die 2. The lower electrode 26 and the upper electrode 27 on both sides in the longitudinal direction clamp the vicinity of the end of the metal tube material 40 from the upper and lower directions to hold the metal tube material 40. In addition, grooves having a shape corresponding to the shape of the outer peripheral surface of the metal tube material 40 are formed on the upper surface of the lower electrode 26 and the lower surface of the upper electrode 27. A driving mechanism (not shown) is provided on the lower electrode 26 and the upper electrode 27, so that the lower electrode 26 and the upper electrode 27 can be moved independently in the upper and lower directions.

[0037] The heating unit 5 heats the metal tube material 40. The heating unit 5 is a mechanism for heating the metal tube material 40 by energizing the metal tube material 40. The heating unit 5 heats the metal tube material 40 when the metal tube material 40 is between the lower die 11 and the upper die 12 and the metal tube material 40 is separated from the lower die 11 and the upper die 12. The heating unit 5 includes the lower electrode 26 and the upper electrode 27 on both sides in the longitudinal direction, and a power source 28 for passing current to the metal tube material 40 via these electrodes 26 and 27. In addition, the heating unit may be arranged in the previous process of the molding device 1 so as to perform heating externally.

[0038] The fluid supply unit 6 is a mechanism for supplying a high-pressure fluid into the metal tube material 40 held between the lower mold 11 and the upper mold 12. The fluid supply unit 6 supplies the high-pressure fluid to the metal tube material 40 heated by the heating unit 5 to a high-temperature state, thereby expanding the metal tube material 40. The fluid supply unit 6 is provided at both ends of the molding die 2 in the longitudinal direction. The fluid supply unit 6 includes: a nozzle 31 for supplying a fluid into the metal tube material 40 from an opening at the end of the metal tube material 40; a driving mechanism 32 for moving the nozzle 31 forward and backward relative to the opening of the metal tube material 40; and a supply source 33 for supplying a high-pressure fluid into the metal tube material 40 via the nozzle 31. The driving mechanism 32 makes the nozzle 31 close to the end of the metal tube material 40 in a state of ensuring sealing when supplying and exhausting the fluid, and separates the nozzle 31 from the end of the metal tube material 40 at other times. In addition, the fluid supply unit 6 may also supply a gas such as high-pressure air or an inert gas as the fluid. Furthermore, the fluid supply unit 6, the holding unit 4 having a mechanism for moving the metal tube material 40 in the vertical direction, and the heating unit 5 may be provided as the same device.

[0039] The cooling unit 7 is a mechanism for cooling the forming die 2. The cooling unit 7 cools the forming die 2, and thus, when the expanded metal tube material 40 contacts the forming surface of the forming die 2, the metal tube material 40 can be quickly cooled. The cooling unit 7 includes a flow path 36 formed inside the lower die 11 and the upper die 12, and a water circulation mechanism 37 that supplies cooling water to the flow path 36 and circulates the cooling water.

[0040] The control unit 8 is a device that controls the entire molding device 1. The control unit 8 controls the drive mechanism 3, the holding unit 4, the heating unit 5, the fluid supply unit 6, and the cooling unit 7. The control unit 8 repeatedly performs the operation of molding the metal tube material 40 by the molding die 2.

[0041] Specifically, the control unit 8 controls the conveying timing of a conveying device such as a robot arm, so as to arrange the metal tube material 40 between the lower die 11 and the upper die 12 in the open state. Alternatively, the control unit 8 may wait for the operator to manually arrange the metal tube material 40 between the lower die 11 and the upper die 12. Furthermore, the control unit 8 controls the actuator of the holding unit 4 so that the metal tube material 40 is supported by the lower electrodes 26 on both sides in the longitudinal direction, and then the upper electrode 27 is lowered to clamp the metal tube material 40. Furthermore, the control unit 8 controls the heating unit 5 to conduct electric heating to the metal tube material 40. As a result, a current flows in the axial direction of the metal tube material 40, and the metal tube material 40 itself generates heat based on Joule heat due to the resistance of the metal tube material 40 itself.

[0042] The control unit 8 controls the driving mechanism 3 so that the upper mold 12 descends and approaches the lower mold 11, thereby closing the molding die 2. On the other hand, the control unit 8 controls the fluid supply unit 6 to seal the openings at both ends of the metal tube material 40 using the nozzle 31 and supply fluid. As a result, the metal tube material 40 softened by heating expands and contacts the molding surface of the molding die 2. Moreover, the metal tube material 40 is formed into a shape that is the same as the shape of the molding surface of the molding die 2. In addition, when forming a metal tube with a flange, a part of the metal tube material 40 is allowed to enter the gap between the lower mold 11 and the upper mold 12, and then the mold is closed continuously, thereby flattening the entered part to form a flange part. If the metal tube material 40 contacts the molding surface, the molding die 2 cooled by the cooling unit 7 will quickly cool the metal tube material 40, thereby implementing quenching of the metal tube material 40.

[0043] refer to Figure 3 , the molding steps of the molding device 1 are described. Figure 3As shown in (a), the control unit 8 closes the molding die 2 and causes the fluid supply unit 6 to supply fluid to the metal tube material 40, thereby performing blow molding (primary blow molding). In the primary blow molding, the control unit 8 uses the main cavity MC to mold the tube portion 43 and causes the portion corresponding to the flange portion 44 to enter the secondary cavity SC. Then, as shown in FIG. Figure 3 As shown in (b), the control unit 8 causes the molding die 2 to continue to close and further flatten the portion entering the sub-cavity SC, thereby molding the flange portion 44. Next, the control unit 8 causes the upper mold 12 to rise and separate from the metal tube material 40, thereby performing mold opening. Thus, a molded product 41 is molded.

[0044] refer to Figure 4 In (a), the molded product 41 is described. The molded product 41 includes: a molded main body 45 having a tube 43 and a flange 44, a retained portion 46 at both end sides in the length direction, and a gradient portion 47 between the molded main body 45 and the retained portion 46. The molded main body 45 is a portion that becomes a final product by laser processing. The tube 43 is a hollow portion. The flange 44 is a plate-like portion that protrudes from the tube 43 by flattening a portion of the metal tube material 40. The retained portion 46 is a cylindrical portion retained by the electrodes 26 and 27. The nozzle 31 is inserted into the retained portion 46. The gradient portion 47 is a transition portion where the shape of the retained portion 46 changes to the shape of the molded main body 45.

[0045] Return to Figure 1 , the molded product 41 molded by the molding device 1 is supplied to the laser processing device 70. The molded products 41 can be supplied to the laser processing device 70 in the order in which the molding is completed from the molding device 1. Alternatively, after a certain amount of molded products 41 are accumulated at the accumulation position, they can be collectively supplied to the laser processing device 70. When the molded products 41 are accumulated, the temperature of the molded products 41 can be lowered before laser processing by the cooling effect based on natural heat dissipation.

[0046] The laser processing device 70 is a device that processes the molded product 41 taken out from the molding die 2 using laser light. The laser processing device 70 irradiates the molded product 41 with laser light to perform processing such as cutting, drilling, and notch formation.

[0047] Figure 4 2 is a perspective view showing a state where laser processing is performed by the laser processing device 70. Figure 4As shown in (a), the laser processing device 70 includes a setting portion 71 and a laser head 72. The setting portion 71 is a portion for setting the molded product 41 at a position facing the laser head 72. The setting portion 71 has a support portion (not shown) and supports the molded product 41 by the support portion. Thus, the molded product 41 is set on the setting portion 71 at a position and posture suitable for laser processing. The laser head 72 is a portion that irradiates the molded product 41 with laser to process the molded product 41.

[0048] The laser head 72 cuts the vicinity of both ends of the molding main body 45, thereby Figure 4 As shown in (b), the gradual change portion 47 and the held portion 46 are removed from the molded main body portion 45. Then, the laser head 72 forms a hole 49 at a predetermined position of the molded main body portion 45.

[0049] Return to Figure 1 The molded product 41 processed by the laser processing device 70 is supplied to the sandblasting device 50. The molded products 41 can be supplied to the sandblasting device 50 in the order of processing from the laser processing device 70. Alternatively, a certain number of molded products 41 can be accumulated at the accumulation position and then collectively supplied to the sandblasting device 50.

[0050] The sandblasting device 50 is a device for removing oxide scale from the molded product 41 processed by the laser processing device 70. The oxide scale refers to an oxide film formed on the surface of the material by heating the metal tube material 40 in the molding device 1. The sandblasting device 50 sprays particles onto the surface of the molded product 41. The sandblasting device 50 removes oxide scale from the surface of the molded product 41 by the impact of the collision of the particles.

[0051] Figure 5 (a) is a schematic diagram of a sandblasting device 50 according to this embodiment. The sandblasting device 50 according to this embodiment removes oxide scale on the outer peripheral surface of the molded product 41. On the other hand, the sandblasting device 50 does not spray particles toward the inner peripheral surface to prevent particles from remaining inside the molded product 41. For example, Figure 4 As shown, the molded product 41 has a flange portion 44 formed by flattening a portion of the metal tube material 40. In the internal space of the molded product 41, particles are likely to remain in such a flange portion 44. Therefore, the sandblasting device 50 sprays particles only on the outer peripheral surface of the molded product 41.

[0052] like Figure 5As shown in (a), the sandblasting device 50 has a setting portion 51, a nozzle 52 and a shielding wall 53. The setting portion 51 is a portion for setting the molded product 41 at a position facing the nozzle 52. The setting portion 51 has a supporting portion not shown in the figure, and the molded product 41 is supported by the supporting portion. Thus, the molded product 41 is set on the setting portion 51 in a position and posture suitable for sandblasting. The setting portion 51 suspends the molded product 41 and sets it in a posture extending in the up and down direction. The nozzle 52 is a component that sprays particles 55 onto the molded product 41. As particles, materials such as sand, plastic, dry ice, and iron sheets are used. The nozzle 52 is arranged around the molded product 41 set in the setting portion 51. The nozzle 52 is arranged so that the injection port faces the outer peripheral surface of the molded product 41. Thus, the nozzle 52 can spray particles 55 onto the outer peripheral surface of the molded product 41.

[0053] The shielding wall 53 is a wall body that shields the particles 55. The shielding wall 53 is arranged to surround the installation portion 51 and the nozzle 52. Thus, the shielding wall 53 can prevent the particles 55 from scattering around the sandblasting device 50. That is, the shielding wall 53 can prevent the particles 55 from scattering toward the molding device 1 and the laser processing device 70. In addition to the shielding wall 53, a wall portion that partitions the space between the sandblasting device 50 and the laser processing device 70 may be provided.

[0054] Next, refer to Figure 6 The molding method according to this embodiment will be described. Figure 6 is a process diagram showing the molding method involved in this embodiment. Figure 6 As shown in FIG. 1 , the molding method includes a molding step S10, a laser processing step S20 (processing step), and a sandblasting step S30 (oxidation scale removal step). In the molding step S10, a fluid is supplied to the heated metal tube material 40 so that the expanded metal tube material 40 contacts the molding surface of the molding die 2, thereby molding a molded product 41. In the molding step S10, a molded product 41 is formed by using a laser processing step S20 (processing step). Figure 2 The molding device 1 shown in the figure molds the molded product 41. The laser processing step S20 is a step of processing the molded product 41 taken out from the molding die 2. In the laser processing step S20, Figure 4 The laser processing device 70 shown in FIG. 1 processes the molded product 41. The sandblasting step S30 is a step of removing oxide scale from the molded product 41 processed in the laser processing step S20. Figure 5 The sandblasting device 50 shown in (a) performs sandblasting to remove oxide scale from the molded product 41 .

[0055] Next, the effects of the molding system 100 and the molding method according to the present embodiment will be described.

[0056] In the molding system 100, the molding device 1 supplies fluid to the heated metal tube material 40 to expand it and mold it using the molding die 2. Therefore, oxide scale is generated on the surface of the molded product 41. In response to this, the laser processing device 70 processes the molded product 41 taken out from the molding die 2. And the sandblasting device 50 removes oxide scale from the molded product 41 processed by the laser processing device 70. In this way, the laser processing device 70 processes the molded product 41 at the stage before removing the oxide scale. At this time, the laser processing device 70 can reduce the area of ​​the oxide scale removal object compared to the molded product 41 just after molding. Therefore, the sandblasting device 50 can perform oxide scale removal processing on the molded product 41 whose area of ​​the oxide scale removal object has been reduced. Therefore, compared with the oxide scale removal processing performed on the molded product 41 just after molding, the sandblasting device 50 can remove the oxide scale in a shorter time with a smaller device. As a result, the oxide scale removal efficiency can be improved.

[0057] For example, if sandblasting is performed before processing by the laser processing device 70, the sandblasting device 50 will also sandblast the gradual change portion 47 and the retained portion 46 that will not become the product. Figure 5 When the molded product 41 is suspended in a hanger manner as shown, the height and width of the sandblasting device 50 need to be set taking into account the parts that will not become products at both ends of the molded body 45. In addition, when the inner peripheral surface of the molded product 41 is sandblasted, the length of the sandblasting hose 56 needs to be set to a length that takes into account the parts that will not become products. In contrast, the molding system 100 according to the present embodiment performs sandblasting after pre-cutting the parts that will not become products, so that the sandblasting device 50 can be miniaturized and the sandblasting range can be reduced, thereby shortening the sandblasting time.

[0058] The sandblasting device 50 can remove scale from the molded product 41 by collision of particles with the molded product 41. At this time, the sandblasting device 50 can remove burrs, spatters, scum, etc. generated by processing or flatten the surface by collision of particles.

[0059] Furthermore, in the molded product 41, there is a possibility that the periphery of the portion cut by laser processing is affected by heat and tempered or the surface becomes rough due to laser processing. In response to this, by performing sandblasting after laser processing by the sandblasting device 50, the surface can be flattened by sandblasting or a shot peening hardening effect based on work hardening can be achieved. Furthermore, from the perspective of the freezing of the shape, it is also possible to suppress the situation where the shape changes subtly from the shape that has been sandblasted, thereby suppressing the quality deviation of the final shape of the molded product 41. Furthermore, for example, the molded product 41 is sometimes marked with a mark to indicate the reference position for laser processing. If sandblasting is performed before laser processing, the mark may become faint and difficult to read. In contrast, since the laser processing device 70 performs processing at a stage before sandblasting, the mark can be read in an easy-to-read state. Therefore, the processing accuracy of the laser processing device 70 is improved.

[0060] [Second embodiment]

[0061] Next, refer to Figure 7 The molding system 200 according to the second embodiment will be described. Figure 7 As shown, the molding system 200 includes a cooling unit 90 that actively cools the molded product 41 taken out from the molding die 2 at a previous stage of the laser processing device 70 .

[0062] Active cooling means that the molded product 41 is actively processed so as to be cooled with a higher cooling capacity than when it is left at room temperature. As such a cooling unit 90, a mechanism that supplies a cooling medium such as cold air, cold water, ice, and dry ice to the molded product 41 can be used. For example, in the case where there is a conveying device that reaches the laser processing device 70, the cooling unit 90 can blow cold air to the molded product 41 on the conveyor. The cooling unit 90 can also spray dry ice. Alternatively, as the cooling unit 90, a device such as a refrigerator that contains the molded product 41 in a low-temperature atmosphere can also be used.

[0063] The molded product 41 taken out from the molding die 2 is in a high temperature state. If the molded product 41 is processed directly in this high temperature state, the processing accuracy will be reduced due to the influence of cooling shrinkage when the temperature drops. Therefore, it is necessary to lower the temperature of the molded product 41 before processing. In this regard, the molding system 200 also includes a cooling unit 90 that actively cools the molded product 41 taken out from the molding die 2, and the laser processing device 70 processes the molded product 41 cooled by the cooling unit 90. Since the cooling unit 90 actively cools the molded product 41, the time required for processing can be reduced compared to the case of natural heat dissipation.

[0064] [Third embodiment]

[0065] Next, refer to Figure 8 The molding system 300 according to the third embodiment will be described. Figure 8 As shown, the molding system 300 includes: a first sandblasting device 50, which is arranged at the front stage of the laser processing device 70; and a second sandblasting device 80, which removes oxide scale from the molded product 41 processed by the laser processing device 70. In addition, here, the first sandblasting device 50 corresponds to the "cooling unit" in the claims, and the second sandblasting device 80 corresponds to the "oxide scale removal unit" in the claims. In this case, the first sandblasting device 50 can spray dry ice as particles 55. The first sandblasting device 50 spraying particles 55 other than dry ice can also obtain a cooling effect by the influence of air supply, but spraying dry ice can obtain a higher cooling effect.

[0066] like Figure 5 As shown in (b), the second sandblasting device 80 sprays particles 55 from the sandblasting hose 56 toward the inner peripheral surface of the molded product 41. The sandblasting hose 56 is inserted into the interior of the molded product 41, and sprays particles toward the inner peripheral surface in the interior. At this time, the sandblasting hose 56 can spray dry ice as the particles 55. Dry ice collides with the inner peripheral surface of the molded product 41 as a solid to remove the oxide scale, but it will turn into gas and disappear over time. Therefore, it is possible to suppress the particles 55 from remaining on the flange portion 44.

[0067] In addition, the first sandblasting device 50 and the second sandblasting device 80 may also be composed of a common device. Figure 5 The sandblasting device 50 in (a) is added Figure 5 The sandblasting hose 56 in (b) is shown. Such a sandblasting device performs sandblasting from the nozzle 52 toward the outer peripheral surface of the molded product 41 in the first sandblasting step, and performs sandblasting from the sandblasting hose 56 toward the inner peripheral surface of the molded product 41 in the second sandblasting step. As a result, the number of devices in the molding system 200 can be reduced.

[0068] The present invention is not limited to the above-mentioned embodiments.

[0069] In the above embodiment, a sandblasting device is exemplified as the oxide scale removal unit. However, the oxide scale removal unit may be any device as long as it can remove oxide scale. For example, a device that sprays a fluid on the molded product or removes oxide scale by ultrasonic cleaning may also be used. Such an oxide scale removal unit also exerts a cooling effect.

[0070] The processing unit is not limited to the laser processing device, and a device based on other processing methods may be used.

[0071] The molding device 1 is not limited to Figure 2 The structure shown in FIG. 1 may also be used, for example Fig. 9 The structure shown is used as a forming device 1. Fig. 9In the molding device 1 shown, it is possible to use Fig.10 The heating expansion unit 150 is shown. Fig.10 (a) is a schematic side view showing a heating expansion unit 150 in which the components of the holding unit 4, the heating unit 5, and the fluid supply unit 6 are unitized. Fig.10 (b) is a cross-sectional view showing a state where the metal tube material 40 is sealed by the nozzle 31 .

[0072] like Fig.10 As shown in (a), the heating expansion unit 150 includes: the lower electrode 26 and the upper electrode 27 described above; an electrode mounting unit 151 on which the electrodes 26 and 27 are mounted; the nozzle 31 and the driving mechanism 32 described above; a lifting unit 152; and a unit base 153. The electrode mounting unit 151 includes a lifting frame 154 and electrode frames 156 and 157. The electrode frames 156 and 157 function as a part of the driving mechanism 60 that supports and moves the electrodes 26 and 27. The driving mechanism 32 drives the nozzle 31 and is lifted and lowered together with the electrode mounting unit 151. The driving mechanism 32 includes a piston 61 that holds the nozzle 31 and a cylinder 62 that drives the piston. The lifting unit 152 includes: a lifting frame base 64 that is mounted on the upper surface of the unit base 153; and a lifting actuator 66 that imparts lifting motion to the lifting frame 154 of the electrode mounting unit 151 through these lifting frame bases 64. The lifting frame base 64 has guide parts 64a and 64b for guiding the lifting and lowering action of the lifting frame 154 relative to the unit base 153. The lifting unit 152 functions as a part of the driving mechanism 60 of the holding part 4. The heating expansion unit 150 has a plurality of unit bases 153 with different inclination angles of the upper surface. By replacing these unit bases 153, the inclination angles of the lower electrode 26 and the upper electrode 27, the nozzle 31, the electrode mounting unit 151, the driving mechanism 32, and the lifting unit 152 can be uniformly changed and adjusted.

[0073] The nozzle 31 is a cylindrical member that can be inserted into the end of the metal tube material 40. The nozzle 31 is supported by the drive mechanism 32 in such a manner that the center line of the nozzle 31 coincides with the reference line SL1. The inner diameter of the supply port 31a at the end of the nozzle 31 on the metal tube material 40 side is substantially consistent with the outer diameter of the metal tube material 40 after expansion molding. In this state, the nozzle 31 supplies a high-pressure fluid from the internal flow path 63 toward the metal tube material 40. In addition, as an example of a high-pressure fluid, gas or the like can be cited.

[0074] Explanation of symbols

[0075] 1-molding device, 2-molding die, 40-metal tube material, 41-molded product, 50-sandblasting device (oxide scale removal part, cooling part), 70-laser processing device (processing part), 80-second sandblasting device (oxide scale removal part), 90-cooling part, 100, 200, 300-molding system.

Claims

1. A molding system, characterized in that: have: A molding device including a fluid supplying portion for supplying fluid to a heated metal tube material and a molding die for bringing the expanded metal tube material into contact with a molding surface to mold a first molded product; a laser processing device for cutting a portion of the first molded product taken out from the molding die that will not become a product by using a laser; and The scale removing unit removes scale from the second molded product cut by the laser processing device.

2. The molding system according to claim 1, characterized in that: The scale removing unit causes particles to collide with the cut portion of the second molded product.

3. The molding system according to claim 2, characterized in that: A mark indicating a position for laser processing is marked on the first molded product molded by the molding device, and laser cutting is performed by the laser processing device based on the marked mark.

4. A molding method, characterized in that: The following processes are available: A molding step of supplying a fluid to the heated metal tube material and bringing the expanded metal tube material into contact with a molding surface of a molding die, thereby molding a first molded product; a laser cutting step of cutting a portion of the first molded product taken out of the molding die that will not become a product by using a laser; and The scale removal step removes scale from the second molded product cut in the laser cutting step.

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