A forming system that forms a metal pipe by expansion in a die includes a heater that heats at least an end part of a metal pipe material, a fluid supply unit that supplies a fluid into the metal pipe material to expand the metal pipe material, and a controller that controls the heater and the fluid
A forming system that forms a metal pipe by expansion in a die includes a heater that heats at least an end part of a metal pipe material, a fluid supply unit that supplies a fluid into the metal pipe material to expand the metal pipe material, and a controller that controls the heater and the fluid supply unit, the fluid supply unit has a nozzle that supplies the fluid from the end part of the metal pipe material into the metal pipe material, and the controller controls the heater so as to heat the end part of the metal pipe material at least before the supply of the fluid by the fluid supply unit, and controls the fluid supply unit so as to expand the end part of the metal pipe material.
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1. A forming system that forms a metal pipe by expansion in a die, the system comprising: a fluid supply unit that has a nozzle, the nozzle is configured to supply a fluid into the metal pipe material to expand the metal pipe material; anda heater configured to heat at least an end part of a metal p
1. A forming system that forms a metal pipe by expansion in a die, the system comprising: a fluid supply unit that has a nozzle, the nozzle is configured to supply a fluid into the metal pipe material to expand the metal pipe material; anda heater configured to heat at least an end part of a metal pipe material, a tapered conical surface of the nozzle is configured to come into contact with the end part of the metal pipe material before the tapered conical surface of the nozzle brings the end part of the metal pipe material into contact with the heater,wherein:the heater comprises a pair of electrodes that are configured to supply electric power to the metal pipe material to heat the metal pipe material, the tapered conical surface of the nozzle is configured to bring the end part of the metal pipe material into direct physical contact with the electrodes,the pair of electrodes is situated in a vicinity of the die, an end part at each of the electrodes has a tapered recessed surface in a direction away from the die, andrecessed grooves into which the metal pipe material is fitted are formed in the pair of electrodes, the end part of the metal pipe material is expandable by pressing the end part of the metal pipe material against the tapered recessed surfaces by the nozzle. 2. The forming system according to claim 1, wherein the tapered conical surface of the nozzle is tapered toward a tip end part of the nozzle. 3. The forming system according to claim 2, wherein the tip end part of the nozzle is configured to extend into the end part of the metal pipe material. 4. The forming system according to claim 1, wherein the tapered conical surface of the nozzle extends toward the tip end part of the nozzle from a perimeter of the nozzle, the perimeter of the nozzle has a diameter that is greater than a diameter of the metal pipe material. 5. The forming system according to claim 1, wherein the tapered conical surface of the nozzle is configured to bring the end part of the metal pipe material into direct contact with the heater. 6. The forming system according to claim 1, wherein the fluid supply unit is controllable to generate a pressing force, the pressing force moves the nozzle so that the tapered conical surface of the nozzle presses the end part of the metal pipe material against the heater. 7. The forming system according to claim 1, wherein the fluid supply unit is controllable to supply the fluid into the metal pipe material. 8. The forming system according to claim 1, wherein the heater is controllable to heat the end part of the metal pipe material before the fluid supply unit supplies the fluid into the metal pipe material. 9. A forming method for forming a metal pipe by expansion in a die wherein a fluid supply unit that has a nozzle, the nozzle is configured to supply a fluid into the metal pipe material to expand the metal pipe material, the method comprising: bringing a tapered conical surface of the nozzle into contact with an end part of the metal pipe material, the tapered conical surface of the nozzle brings the end part of the metal pipe material into direct physical contact with a pair of electrodes;bringing the end part of the metal pipe material into contact with a heater after the tapered conical surface of the nozzle has been brought into contact with the end part of the metal pipe material, recessed grooves into which the metal pipe material is fitted are formed in the pair of electrodes;controlling the heater to heat the end part of the metal pipe material, the heater comprises the pair of electrodes that supply electric power to the metal pipe material to heat the metal pipe material; andexpanding the metal pipe material by controlling the fluid supply unit to supply the fluid into the metal pipe material through the nozzle, the end part of the metal pipe material is expanded by pressing the end part of the metal pipe material against the tapered recessed surfaces by the nozzle,wherein the pair of electrodes is situated in a vicinity of the die, an end part at each of the electrodes has a tapered recessed surface in a direction away from the die. 10. The forming method according to claim 9, wherein the tapered conical surface of the nozzle is tapered toward a tip end part of the nozzle. 11. The forming method according to claim 10, wherein the tip end part of the nozzle is configured to extend into the end part of the metal pipe material. 12. The forming method according to claim 9, further comprising: controlling the fluid supply unit to generate a pressing force, the pressing force moves the nozzle so that the tapered conical surface of the nozzle presses the end part of the metal pipe material against the heater. 13. The forming method according to claim 12, wherein bringing the tapered conical surface of the nozzle into contact with the end part of the metal pipe material includes controlling the fluid supply unit to generate the pressing force. 14. The forming method according to claim 9, wherein the heater is controlled to heat the end part of the metal pipe material before the fluid supply unit supplies the fluid into the metal pipe material. 15. The forming method according to claim 9, wherein the tapered conical surface of the nozzle extends toward the tip end part of the nozzle from a perimeter of the nozzle, the perimeter of the nozzle has a diameter that is greater than a diameter of the metal pipe material. 16. The forming method according to claim 9, wherein the tapered conical surface of the nozzle is configured to bring the end part of the metal pipe material into direct contact with the heater.
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