WO2015087601A1 - 成形装置 - Google Patents
成形装置 Download PDFInfo
- Publication number
- WO2015087601A1 WO2015087601A1 PCT/JP2014/076098 JP2014076098W WO2015087601A1 WO 2015087601 A1 WO2015087601 A1 WO 2015087601A1 JP 2014076098 W JP2014076098 W JP 2014076098W WO 2015087601 A1 WO2015087601 A1 WO 2015087601A1
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- WIPO (PCT)
- Prior art keywords
- mold
- metal pipe
- pipe material
- cavity
- molding
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/035—Deforming tubular bodies including an additional treatment performed by fluid pressure, e.g. perforating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/045—Closing or sealing means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/047—Mould construction
Definitions
- the present invention relates to a forming apparatus for forming a metal pipe with a flange.
- the forming apparatus shown in Patent Document 1 includes an upper die and a lower die that are paired with each other, a holding portion that holds a metal pipe material between the upper die and the lower die, and a metal pipe material that is held by the holding portion. And a gas supply unit for supplying a gas therein.
- the metal pipe material is expanded and molded into a shape corresponding to the shape of the mold. Can do.
- a flange on the metal pipe When a metal pipe with a flange is formed by the molding apparatus as described above, a cavity having a small volume for flange formation is formed in a mold, the metal pipe is expanded and formed, and the metal pipe is formed in the cavity for flange formation.
- the flange can be formed by crushing a part of the material. In such a case, when the mold cavity is a closed space with respect to the outside of the mold, air is accumulated between the inner surface of the mold and the flange portion during molding of the flange, There is a possibility that the quality of the molded product will be affected.
- the present invention has been made to solve the above-described problems, and an object thereof is to provide a molding apparatus capable of improving the quality of a molded product.
- a molding apparatus is a molding apparatus for molding a metal pipe with a flange, which is a first mold and a second mold, and a first mold and a second mold that are paired with each other.
- a slide that moves at least one of the slide, a drive unit that generates a drive force for moving the slide, a holding unit that holds the metal pipe material between the first mold and the second mold, and a holding
- a gas supply unit that supplies gas into the metal pipe material held in the unit
- a control unit that controls the drive unit, the holding unit, and the gas supply unit, and the first mold and the second mold are A first cavity part for molding the pipe part of the metal pipe, and a second cavity part for molding the flange part, and the control unit is configured to hold the first mold and the second mold by the holding part.
- Metal by feeding gas into the metal pipe material held between The gas supply part is controlled so as to expand the mold material, and the flange part is formed by crushing a part of the expanded metal pipe material with the second cavity part of the first mold and the second mold.
- the drive unit is controlled so that the second cavity portion communicates with the outside of the mold when the flange portion is molded.
- the control unit expands the metal pipe material by supplying gas into the metal pipe material held between the first mold and the second mold by the holding unit.
- the gas supply unit is controlled to be molded.
- the portion corresponding to the pipe portion of the metal pipe material is expanded and formed into a shape corresponding to the first cavity portion, and the portion corresponding to the flange portion expands toward the second cavity portion.
- the control unit controls the drive unit to form the flange portion by crushing a part of the expanded metal pipe material with the second cavity portion of the first mold and the second mold.
- the second cavity portion communicates with the outside of the mold when the flange portion is molded.
- the second cavity portion may communicate with the outside of the mold from the start of molding to the completion of molding. Accordingly, since the air in the second cavity portion can escape outside the mold from the start of molding to the completion of molding, the quality of the molded product can be improved.
- a step having a size corresponding to the thickness of the flange portion is formed in at least one of the first die and the second die in the second cavity portion. Good.
- crushing of the flange portion by the second cavity portion is regulated by a step having a size corresponding to the thickness of the flange portion. Therefore, it can suppress that a flange part is crushed more than necessary.
- the quality of the molded product can be improved.
- FIG. 1 is a schematic configuration diagram of a molding apparatus according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view taken along the line II-II shown in FIG. 1, and is a schematic cross-sectional view of a blow molding die.
- FIG. 3 is a diagram showing a manufacturing process by a molding apparatus
- FIG. 3 (a) is a diagram showing a state where a metal pipe material is set in a mold
- FIG. 3 (b) is a diagram showing a metal pipe material as an electrode. It is a figure which shows the state hold
- FIG. 4 is a diagram showing a blow molding process by the molding apparatus and the subsequent flow.
- FIG. 5 is an enlarged view of the periphery of the electrode, FIG.
- FIG. 5 (a) is a view showing a state where the electrode holds the metal pipe material
- FIG. 5 (b) is a view where the blow mechanism is in contact with the electrode
- FIG. 5C is a front view of the electrode.
- FIG. 6 is a diagram showing the operation of the blow molding die and the change in the shape of the metal pipe material.
- FIG. 6A is a diagram showing the state at the time when the metal pipe material is set in the blow molding die.
- FIG. 6B is a view showing a state at the time of blow molding, and
- FIG. 6C is a view showing a state where the flange portion is formed by pressing.
- FIG. 7 is a diagram showing the operation of the blow molding die according to the modification and the change in the shape of the metal pipe material, and FIG.
- FIG. 7A shows the state at the time when the metal pipe material is set in the blow molding die.
- FIG. 7B is a view showing a state at the time of blow molding
- FIG. 7C is a view showing a state where the flange portion is formed by pressing.
- FIG. 8 is a diagram showing the operation of the blow molding die according to the modification and the change in the shape of the metal pipe material
- FIG. 8A shows the state at the time when the metal pipe material is set in the blow molding die.
- FIG. 8B is a diagram showing a state at the time of blow molding
- FIG. 8C is a diagram showing a state where the flange portion is molded by pressing.
- FIG. 9 is a diagram showing the operation of the blow molding die according to the comparative example and the change in the shape of the metal pipe material
- FIG. 9A shows the state at the time when the metal pipe material is set in the blow molding die
- FIG. 9B is a view showing a state at the time of blow molding
- FIG. 9C is a view showing a state where the flange portion is formed by pressing.
- a molding apparatus 10 for molding a flanged metal pipe includes a blow molding die 13 composed of an upper die (first die) 12 and a lower die (second die) 11. And a slide 82 that moves at least one of the upper mold 12 and the lower mold 11, a drive unit 81 that generates a driving force for moving the slide 82, and a metal pipe material between the upper mold 12 and the lower mold 11. 14, a pipe holding mechanism (holding portion) 30 that holds the pipe 14 horizontally, a heating mechanism 50 that energizes and heats the metal pipe material 14 held by the pipe holding mechanism 30, and a high pressure on the heated metal pipe material 14.
- the control unit 70 closes the blow molding die 13 when the metal pipe material 14 is heated to the quenching temperature (AC3 transformation point temperature or higher) and injects high-pressure gas into the heated metal pipe material 14. Take control.
- a pipe according to a finished product is referred to as a metal pipe 80 (see FIG. 4B), and a pipe in the middle of completion is referred to as a metal pipe material 14.
- the lower mold 11 is fixed to a large base 15. Moreover, the lower mold
- tapered concave surfaces 17b and 18b are formed on the front surfaces of the first and second electrodes 17 and 18 (surfaces on the outer side of the mold). ing.
- a cooling water passage 19 is formed in the lower mold 11 and includes a thermocouple 21 inserted from below at a substantially central position. The thermocouple 21 is supported by a spring 22 so as to be movable up and down.
- the pair of first and second electrodes 17 and 18 located on the lower mold 11 side also serves as a pipe holding mechanism 30 so that the metal pipe material 14 can be raised and lowered between the upper mold 12 and the lower mold 11. Can be supported horizontally.
- the thermocouple 21 is merely an example of a temperature measuring means, and may be a non-contact temperature sensor such as a radiation thermometer or an optical thermometer. If a correlation between the energization time and the temperature can be obtained, the temperature measuring means can be omitted and configured sufficiently.
- the upper mold 12 is a large steel block having a cavity (concave portion) 24 on the lower surface and a cooling water passage 25 built therein.
- the upper mold 12 has an upper end fixed to the slide 82.
- the slide 82 to which the upper mold 12 is fixed is suspended by the pressure cylinder 26 and guided by the guide cylinder 27 so as not to shake.
- the drive unit 81 according to the present embodiment includes a servo motor 83 that generates a drive force for moving the slide 82.
- the drive unit 81 is configured by a fluid supply unit that supplies a fluid that drives the pressurizing cylinder 26 (operating oil when a hydraulic cylinder is used as the pressurizing cylinder 26) to the pressurizing cylinder 26.
- the control unit 70 controls the amount of fluid supplied to the pressurizing cylinder 26 by controlling the servo motor 83 of the driving unit 81. Thereby, the movement of the slide 82 can be controlled.
- the drive unit 81 is not limited to the one that applies a driving force to the slide 82 via the pressure cylinder 26 as described above.
- the servo motor 83 is generated by mechanically connecting the drive unit to the slide 82.
- the driving force to be applied may be applied to the slide 82 directly or indirectly.
- the drive unit 81 may not include the servo motor 83.
- the first is configured so that it can be moved up and down by an actuator (not shown).
- An electrode 17 and a second electrode 18 are provided.
- the lower surfaces of the first and second electrodes 17 and 18 are formed with semicircular arc-shaped grooves 17a and 18a corresponding to the upper outer peripheral surface of the metal pipe material 14 (see FIG. 5C).
- the metal pipe material 14 can be fitted into the concave grooves 17a and 18a.
- tapered concave surfaces 17b and 18b are formed on the front surfaces of the first and second electrodes 17 and 18 (surfaces on the outer side of the mold). ing.
- FIG. 2 shows a schematic cross section of the blow molding die 13 as viewed from the side.
- This is a cross-sectional view of the blow molding die 13 taken along the line II-II in FIG. 1, showing the state of the die position during blow molding.
- complicated steps are formed on the surfaces of the upper mold 12 and the lower mold 11.
- the first protrusion 12b and the second protrusion 12c are formed on the surface of the upper mold 12 when the surface of the cavity 24 of the upper mold 12 is a reference line LV1.
- a first protrusion 12b that protrudes most on the right side (right side in FIG. 2) of the cavity 24 is formed, and a second protrusion 12c is formed on the left side (left side in FIG. 2) of the cavity 24.
- the surface of the lower mold 11 is the first recess 11b on the right side of the cavity 16 (right side in FIG. 2) and the left side of the cavity 16 (left side in FIG. 2), where the surface of the cavity 16 of the lower mold 11 is the reference line LV2.
- a first protrusion 11c is formed.
- first protrusion 12b of the upper mold 12 can be fitted to the first recess 11b of the lower mold 11 just.
- the second protrusion 12c of the upper mold 12 and the first protrusion 11c of the lower mold 11 are formed so as to be separated from and parallel to each other in the vertical direction.
- the main cavity portion (first cavity portion) MC is formed between the main cavity portion MC and the small-cavity sub-cavity portion (second cavity portion) SC. It has become.
- the main cavity portion MC is a portion for forming the pipe portion 80a in the metal pipe 80
- the sub-cavity portion SC is a portion for forming the flange portion 80b in the metal pipe 80.
- the heating mechanism 50 includes a power source 51, a conducting wire 52 extending from the power source 51 and connected to the first electrode 17 and the second electrode 18, and a switch 53 interposed in the conducting wire 52.
- the blow mechanism 60 includes a high-pressure gas source 61, an accumulator 62 that stores the high-pressure gas supplied from the high-pressure gas source 61, a first tube 63 that extends from the accumulator 62 to the cylinder unit 42, and the first tube 63.
- a pressure control valve 64 and a switching valve 65 interposed between the second tube 67 and the second tube 67 extending from the accumulator 62 to the gas passage 46 formed in the seal member 44.
- an on / off valve 68 and a check valve 69 an on / off valve 68 and a check valve 69.
- a tapered surface 45 is formed so that the tip of the seal member 44 is tapered, and the sealing member 44 has a shape that can be fitted and brought into contact with the tapered concave surfaces 17b and 18b of the first and second electrodes. (See FIG. 5).
- the seal member 44 is connected to the cylinder unit 42 via the cylinder rod 43, and can advance and retract in accordance with the operation of the cylinder unit 42.
- the cylinder unit 42 is mounted and fixed on the base 15 via the block 41.
- the pressure control valve 64 serves to supply the cylinder unit 42 with a high-pressure gas having an operating pressure adapted to the pressing force required from the seal member 44 side.
- the check valve 69 serves to prevent the high pressure gas from flowing back in the second tube 67.
- the control unit 70 acquires temperature information from the thermocouple 21 by transmitting information from (A) to (A), and controls the pressurizing cylinder 26, the switch 53, the switching valve 65, the on / off valve 68, and the like. .
- the water circulation mechanism 72 includes a water tank 73 that stores water, a water pump 74 that pumps up and pressurizes the water stored in the water tank 73 and sends the water to the cooling water passage 19 of the lower mold 11 and the cooling water passage 25 of the upper mold 12. It consists of a pipe 75. Although omitted, a cooling tower for lowering the water temperature and a filter for purifying water may be interposed in the pipe 75.
- FIG. 3 shows a process from a pipe feeding process in which a metal pipe material 14 as a material is fed to an energization heating process in which the metal pipe material 14 is energized and heated.
- a hardenable metal pipe material 14 of a steel type is prepared, and this metal pipe material 14 is provided on the lower mold 11 side by a robot arm or the like (not shown). Place on the electrodes 17, 18. Since the grooves 17a and 18a are formed in the first and second electrodes 17 and 18, the metal pipe material 14 is positioned by the grooves 17a and 18a.
- the control unit 70 see FIG.
- the pipe holding mechanism 30 controls the pipe holding mechanism 30 to cause the pipe holding mechanism 30 to hold the metal pipe material 14.
- an actuator (not shown) that allows the electrodes 17 and 18 to move forward and backward is actuated to bring the first and second electrodes 17 and 18 positioned above and below to approach each other. ⁇ Contact.
- this actuator By the operation of this actuator, both ends of the metal pipe material 14 are sandwiched by the first and second electrodes 17 and 18 from above and below.
- the metal pipe material 14 is held in such a manner that the metal pipe material 14 is in close contact with the entire circumference due to the presence of the concave grooves 17a and 18a formed in the first and second electrodes 17 and 18 that contact each other.
- the configuration is not limited to the configuration in which the metal pipe material 14 is in close contact with the entire circumference, and the first and second electrodes 17 and 18 may be in contact with a part of the metal pipe material 14 in the circumferential direction. .
- the control unit 70 heats the metal pipe material 14 by controlling the heating mechanism 50. Specifically, the control unit 70 turns on the switch 53 of the heating mechanism 50. If it does so, electric power will be supplied to the metal pipe material 14 from the power supply 51, and metal pipe material 14 itself heat
- FIG. 4 shows a flow of obtaining a flanged metal pipe 80 in which a flange portion 80b is formed on the pipe portion 80a as a finished product by forming a flange by pressing the metal pipe material 14 after blow molding.
- the control unit 70 controls the blow mechanism 60 so as to supply gas into the metal pipe material 14 held between the upper mold 12 and the lower mold 11 by the pipe holding mechanism 30, and expands the metal pipe material 14. To do.
- the control unit 70 controls the drive unit 81 so as to crush a part of the expansion-molded metal pipe material 14 with the subcavity SC of the upper mold 12 and the lower mold 11 to mold the flange 80b. Specifically, as shown in FIG.
- the blow molding die 13 is closed with respect to the heated metal pipe material 14, and the metal pipe material 14 is placed in the cavity of the blow molding die 13. Seal the arrangement. Thereafter, the cylinder unit 42 is operated, and both ends of the metal pipe material 14 are sealed with the seal member 44 which is a part of the blow mechanism 60 (see also FIG. 5). In this seal, the seal member 44 does not directly contact and seal against both end faces of the metal pipe material 14, but indirectly through the tapered concave surfaces 17b and 18b formed on the first and second electrodes 17 and 18. To be done.
- the sealing performance can be improved because the sealing can be performed over a wide area, the wear of the sealing member due to the repeated sealing operation can be prevented, and further, the crushing of both end faces of the metal pipe material 14 can be effectively prevented. ing.
- high-pressure gas is blown into the metal pipe material 14 to deform the metal pipe material 14 softened by heating so as to follow the shape of the cavity.
- a press operation for forming the flange portion 80b is performed on the metal pipe material 14 after blow molding (details of this will be described later), and when the mold is opened, as shown in FIG. Then, the finished metal pipe 80 having the pipe portion 80a and the flange portion 80b is completed.
- the metal pipe material 14 is softened by being heated to a high temperature (around 950 ° C.), and can be blow-molded at a relatively low pressure. Specifically, when compressed air of 4 MPa at normal temperature (25 ° C.) is used as the high-pressure gas, the compressed air is eventually heated to around 950 ° C. in the sealed metal pipe material 14. The compressed air expands thermally and reaches about 16-17 MPa based on Boyle-Charles' law. That is, the metal pipe material 14 at 950 ° C. can be easily blow-molded.
- the outer peripheral surface of the metal pipe material 14 blown and expanded contacts the cavity 16 of the lower mold 11 and is rapidly cooled, and simultaneously contacts the cavity 24 of the upper mold 12 to rapidly cool (the upper mold 12 and the lower mold).
- 11 has a large heat capacity and is controlled at a low temperature, so if the metal pipe material 14 comes into contact, the heat of the pipe surface is taken away to the mold side at once, and quenching is performed.
- Such a cooling method is called mold contact cooling or mold cooling.
- austenite is transformed into martensite. In the latter half of the cooling, the cooling rate becomes small, so that the martensite is transformed into another structure (truthite, sorbite, etc.) by recuperation. Therefore, it is not necessary to perform a separate tempering process.
- first formed portion 14a a portion corresponding to the pipe portion 80a of the metal pipe 80 according to the finished product of the metal pipe material 14 being formed
- second molded portion 14b The portion to be referred to.
- blow molding is performed in a state where the upper mold 12 and the lower mold 11 are completely closed (clamped). It is not.
- the upper mold 12 and the lower mold 11 are maintained at a certain distance, so that blow molding is performed in a state where the subcavity SC is formed beside the main cavity MC.
- the main cavity portion MC is formed between the surface of the cavity 24 at the reference line LV1 and the surface of the cavity 16 at the reference line LV2.
- the subcavity SC is formed between the surface of the second protrusion 12 c of the upper mold 12 and the surface of the first protrusion 11 c of the lower mold 11.
- the main cavity portion MC and the subcavity portion SC are in communication with each other.
- the surface of the upper mold 12 and the surface of the second protrusion 12c of the upper mold 12 and the surface of the first protrusion 11c of the lower mold 11 constituting the subcavity portion SC are separated from each other in the vertical direction. It extends to the end of the lower mold 11 in the width direction (left side in FIG. 6). Therefore, the subcavity portion SC communicates with the outside of the mold. As a result, as shown in FIG. 6B, the metal pipe material 14 softened by heating and injected with the high-pressure gas enters not only the main cavity portion MC but also the sub-cavity portion SC and expands. In the example shown in FIG.
- the main cavity portion MC is configured to have a rectangular cross section, and therefore, the metal pipe material 14 is formed into a rectangular cross section by blow molding in accordance with the shape.
- corresponds to the 1st shaping
- the shape of the main cavity portion MC is not particularly limited, and any shape such as a circle, an ellipse, or a polygon may be adopted according to a desired shape.
- the main cavity portion MC and the sub-cavity portion SC communicate with each other, a part of the metal pipe material 14 enters the sub-cavity portion SC.
- the said part corresponds to the 2nd shaping
- the upper mold 12 and the lower mold 11 which are separated from each other are brought close to each other after blow molding or in the middle of blow molding.
- the volume of the sub-cavity portion SC is reduced, the internal space of the second molded portion 14b disappears, and the second molded portion 14b is folded. That is, as the upper mold 12 and the lower mold 11 approach, the second molded portion 14b of the metal pipe material 14 entering the subcavity SC is pressed and crushed.
- a second molded portion 14b crushed on the outer peripheral surface of the metal pipe material 14 along the longitudinal direction of the metal pipe material 14 in this state, the metal pipe material 14 is a metal product as a finished product).
- the shape is the same as that of the pipe 80).
- the time from the blow molding to the completion of the press molding of the flange portion 80b is approximately 1 to 2 seconds depending on the type of the metal pipe material 14.
- the surface of the first protrusion 12 b of the upper mold 12 is in contact with the bottom surface of the first recess 11 b of the lower mold 11, so that the upper mold 12 and the lower mold 11 can no longer approach each other.
- the crushed second molded portion 14b that is, between the surface of the second protrusion 12c of the upper die 12 and the surface of the first protrusion 11c of the lower die 11 constituting the subcavity portion SC
- a gap corresponding to the thickness of the flange portion 80b) is formed.
- the subcavity SC is in communication with the outside of the mold. That is, in the example shown in FIG. 6, the subcavity SC is made of gold from the start of molding to the completion of molding at the time of molding the flange 80 b of the metal pipe 80 (second molded portion 14 b of the metal pipe material 14). It communicates with the outside of the mold.
- molding part 14a will also be crushed.
- the metal pipe material 14 is heated and softened, the product can be finished without loosening or twisting by adjusting the mold closing speed, compressed gas, or the like.
- the first protrusion 312b, the second protrusion 312c, and the third protrusion 312d are formed on the surface of the upper mold 312 when the surface of the cavity 324 of the upper mold 312 is the reference line LV1.
- a first protrusion 312b that protrudes most to the right side (right side in FIG. 9) of the cavity 324 is formed, and a second protrusion 312c and a third protrusion 312d are formed stepwise on the left side of the cavity 324 (left side in FIG. 9). .
- the surface of the lower mold 311 is the first recess 311b on the right side of the cavity 316 (right side in FIG. 9) and the left side of the cavity 316 (left side in FIG. 9), where the surface of the cavity 316 of the lower mold 311 is the reference line LV2.
- a first protrusion 311c is formed.
- the first protrusion 312 b of the upper mold 312 can be fitted with the first recess 311 b of the lower mold 311.
- the first protrusion 311c of the lower mold 311 can be fitted to the step portion of the second protrusion 312c and the third protrusion 312d of the upper mold 312.
- a sub-cavity portion SC having a small volume is formed beside the main cavity portion MC at the mold position during blow molding. Yes.
- the third protrusion 312d of the upper mold 312 is formed on the subcavity SC side, and the lower mold 311 of the lower mold 311 is formed at the step portion between the second protrusion 312c and the third protrusion 312d.
- One protrusion 311c can be fitted.
- the side surface 312e of the third protrusion 312d of the upper die 312 and the side surface 311d of the first protrusion 311c of the lower die 311 are in contact with each other. Accordingly, as shown in FIGS.
- the control unit 70 supplies the gas into the metal pipe material 14 held between the upper mold 12 and the lower mold 11 by the pipe holding mechanism 30, thereby
- the blow mechanism 60 is controlled so as to expand and form the pipe material 14.
- the portion of the metal pipe material 14 corresponding to the finished pipe portion 80a (that is, the first molded portion 14a) is expanded and formed into a shape corresponding to the main cavity portion MC, and the flange portion of the finished product.
- a portion corresponding to 80b that is, the second molded portion 14b expands toward the subcavity SC.
- control unit 70 causes the drive unit 81 to mold the flange portion 80b by crushing the second molded portion 14b of the expanded metal pipe material 14 with the subcavity SC of the upper mold 12 and the lower mold 11.
- the sub-cavity portion SC communicates with the outside of the mold when the flange portion 80b is formed. Accordingly, when the flange portion 80b is formed, air between the inner surface of the subcavity portion SC and the second forming portion 14b of the metal pipe material 14 can escape to the outside of the mold. Thereby, generation
- the surface of the second protrusion 12c of the upper mold 12 and the surface of the first protrusion 11c of the lower mold 11 corresponding to the subcavity SC are formed.
- the mold shape can be simplified as compared with the upper mold 312 and the lower mold 311 as shown in FIG. Manufacturing cost can be reduced.
- the subcavity SC is communicated with the outside of the mold from the start of molding to the completion of molding. Accordingly, since the air in the subcavity portion SC can escape to the outside of the mold from the start of molding to the completion of molding, the quality of the molded product can be improved.
- the present invention is not limited to the embodiment described above.
- the blow mold 113 has a sub-cavity part SC1 formed between the surface of the protrusion 112c of the upper mold 112 and the surface of the protrusion 111c of the lower mold 111 on one side of the main cavity part MC.
- the other side of the main cavity portion MC has a sub-cavity portion SC2 formed between the surface of the protrusion 112b of the upper die 112 and the surface of the protrusion 111b of the lower die 111.
- the blow molding die 113 can mold the flange portions 80 b on both sides of the pipe portion 80 a of the metal pipe 80.
- both the sub-cavity portion SC1 and the sub-cavity portion SC2 communicate with the outside of the mold from the start of molding to the completion of molding. However, it suffices that at least one of the sub cavity portion SC1 and the sub cavity portion SC2 communicates with the outside of the mold.
- a blow mold 213 having a configuration as shown in FIG. 8 may be adopted.
- a step 220 having a size corresponding to the flange portion 80b is formed in the upper die 212 in the subcavity SC.
- the step 220 is formed by further providing a protrusion 212d on the surface of the protrusion 212c of the upper mold 212.
- the crushing of the flange part 80b by the sub-cavity part SC is restricted by the step 220 having a size corresponding to the thickness of the flange part 80b. Is done. Therefore, it can suppress that the flange part 80b is crushed more than necessary.
- the subcavity SC is cut off from the outside of the mold, but the second forming portion 14b has already been crushed to form the flange portion 80b. Since it is later, no wrinkles or the like occur in the flange portion 80b. In the example shown in FIG.
- the step is formed on the upper mold 212 side, but the step 220 may be formed on the lower mold 211.
- step difference may be formed in both the upper mold
- the heating mechanism 50 which can be heat-processed between upper and lower metal mold
- the heat treatment may be performed at a place other than between the upper and lower molds, and the heated metal pipe may be carried between the molds.
- radiant heat from a heater or the like may be used, or heating using high-frequency induction current is also possible.
- non-oxidizing gases such as nitrogen gas and argon gas and inert gases can be mainly used. Although these gases can make it difficult to generate oxide scale in the metal pipe, they are expensive. In this regard, compressed air is inexpensive unless it causes a major problem due to the generation of oxide scale, and there is no actual damage even if it leaks into the atmosphere, and handling is extremely easy. Therefore, the blowing process can be executed smoothly.
- the blow mold may be either an anhydrous cold mold or a water-cooled mold.
- the anhydrous cold mold takes a long time to lower the mold to near room temperature after completion of blow molding. In this respect, cooling is completed in a short time with a water-cooled mold. Therefore, a water-cooled mold is desirable from the viewpoint of improving productivity.
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- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
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- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
図1に示しているように、フランジ付きの金属パイプを成形する成形装置10は、上型(第1の金型)12及び下型(第2の金型)11からなるブロー成形金型13と、上型12及び下型11の少なくとも一方を移動させるスライド82と、スライド82を移動させるための駆動力を発生させる駆動部81と、上型12と下型11との間に金属パイプ材料14を水平に保持するパイプ保持機構(保持部)30と、このパイプ保持機構30で保持されている金属パイプ材料14に通電して加熱する加熱機構50と、加熱された金属パイプ材料14に高圧ガスを吹込むブロー機構(気体供給部)60と、駆動部81、パイプ保持機構30、加熱機構50及びブロー機構60を制御する制御部70と、ブロー成形金型13を強制的に水冷する水循環機構72とを備えて構成されている。制御部70は、金属パイプ材料14が焼入れ温度(AC3変態点温度以上)に加熱されたときにブロー成形金型13を閉じるとともに加熱された金属パイプ材料14に高圧ガスを吹込む等の一連の制御を行う。なお、以下の説明では、完成品に係るパイプを金属パイプ80(図4(b)参照)と称し、完成に至る途中の段階のパイプを金属パイプ材料14と称するものとする。
次に、成形装置10の作用について説明する。図3は材料としての金属パイプ材料14を投入するパイプ投入工程から、金属パイプ材料14に通電して加熱する通電加熱工程までを示している。図3(a)に示すように、焼入れ可能な鋼種の金属パイプ材料14を準備し、この金属パイプ材料14を、ロボットアーム等(図示しない)により、下型11側に備わる第1、第2電極17、18上に載置する。第1、第2電極17、18には凹溝17a、18aが形成されているので、当該凹溝17a、18aによって金属パイプ材料14が位置決めされる。次に、制御部70(図1参照)は、パイプ保持機構30を制御することによって、当該パイプ保持機構30に金属パイプ材料14を保持させる。具体的には、図3(b)のように、各電極17、18を進退動可能としているアクチュエータ(図示しない)を作動させ、各上下に位置する第1、第2電極17、18を接近・当接させる。このアクチュエータの作動によって、金属パイプ材料14の両端部は、上下から第1、第2電極17、18によって挟持される。また、金属パイプ材料14は、当接する第1、第2電極17、18に形成される凹溝17a、18aの存在によって、その全周に渡って密着するような態様で挾持されることとなる。ただし、金属パイプ材料14の全周に渡って密着する構成に限られず、金属パイプ材料14の周方向における一部に第1、第2電極17,18が当接するような構成であってもよい。
Claims (3)
- フランジ付きの金属パイプを成形する成形装置であって、
互いに対となる第1の金型及び第2の金型と、
前記第1の金型及び前記第2の金型の少なくとも一方を移動させるスライドと、
前記スライドを移動させるための駆動力を発生させる駆動部と、
前記第1の金型と前記第2の金型との間で金属パイプ材料を保持する保持部と、
前記保持部に保持された前記金属パイプ材料内に気体を供給する気体供給部と、
前記駆動部、前記保持部及び前記気体供給部を制御する制御部と、を備え、
前記第1の金型及び前記第2の金型は、前記金属パイプのパイプ部を成形する第1のキャビティ部と、フランジ部を成形する第2のキャビティ部と、を備え、
前記制御部は、
前記保持部によって前記第1の金型と前記第2の金型との間で保持された前記金属パイプ材料内に気体を供給することによって、前記金属パイプ材料を膨張成形するように前記気体供給部を制御し、
膨張した前記金属パイプ材料の一部を前記第1の金型及び前記第2の金型の前記第2のキャビティ部で押し潰すことによって前記フランジ部を成形するように前記駆動部を制御し、
前記第2のキャビティ部は、前記フランジ部の成形時において、金型外部と連通する、成形装置。 - 前記第2のキャビティ部は、成形開始から成形完了に至るまで、前記金型外部と連通する、請求項1に記載の成形装置。
- 前記第2のキャビティ部には、前記第1の金型及び前記第2の金型の少なくとも一方に、前記フランジ部の厚さに対応する大きさの段差が形成される、請求項1に記載の成形装置。
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CA2933110A CA2933110C (en) | 2013-12-09 | 2014-09-30 | Molding device |
EP14870135.2A EP3081317B1 (en) | 2013-12-09 | 2014-09-30 | Molding device |
KR1020187008808A KR102115681B1 (ko) | 2013-12-09 | 2014-09-30 | 성형장치 |
CN201480067096.1A CN105980075A (zh) | 2013-12-09 | 2014-09-30 | 成型装置 |
KR1020167016049A KR20160087852A (ko) | 2013-12-09 | 2014-09-30 | 성형장치 |
US15/175,264 US10173254B2 (en) | 2013-12-09 | 2016-06-07 | Molding apparatus |
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KR20160087852A (ko) | 2016-07-22 |
EP3081317A1 (en) | 2016-10-19 |
US20160279693A1 (en) | 2016-09-29 |
EP3081317B1 (en) | 2022-09-21 |
CN105980075A (zh) | 2016-09-28 |
KR20180035938A (ko) | 2018-04-06 |
US10173254B2 (en) | 2019-01-08 |
CA2933110A1 (en) | 2015-06-18 |
JP6326224B2 (ja) | 2018-05-16 |
CA2933110C (en) | 2022-02-22 |
KR102115681B1 (ko) | 2020-05-26 |
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