A forming device which expands a metal pipe material to form a metal pipe having a pipe portion and a flange portion includes first and second dies paired with each other and including pipe forming surfaces for forming the pipe portion and flange forming surfaces for forming the flange portion, a drive unit that drives at least one of the first and second dies, and a controller that controls the drive unit, in which, on at least one of the flange forming surfaces of the first and second dies, a protrusion portion protruding by an amount not to abut against the other flange forming surface when the dies are closed is formed and the controller controls the drive unit to form a thin wall portion at which a thickness of the flange portion becomes partially small at the flange portion by the protrusion portion pressing the flange portion.

Provided is a forming device including a die, a lower base portion, an upper base portion, a pillar portion, and an electrical heating unit, in which, at a time of electrical heating performed by the electrical heating unit, a magnetic flux density inside the pillar portion is higher than at least one of a magnetic flux density at a center of a lower surface of the lower base portion and a magnetic flux density at a center of an upper surface of the upper base portion.

The present invention discloses a method for pressure forming of an aluminum alloy special-shaped tubular component by using an ultra-low temperature medium. By means of the characteristics that the forming property of an aluminum alloy tube is greatly improved under ultra-low temperature conditions, a tube is cooled and pressurized in a die through an ultra-low temperature medium, so that the tube forms a special-shaped tubular component at an ultra-low temperature. In the method for pressure forming of an aluminum alloy special-shaped tubular component by using an ultra-low temperature medium, the ultra-low temperature medium is not only used for cooling the die and the tube, but also used for pressurization to achieve flexible loading of the tube, which is favorable for forming complex special-shaped tubular components with varied cross-sections.

The present invention discloses a method for pressure forming of an aluminum alloy special-shaped tubular component by using an ultra-low temperature medium. By means of the characteristics that the forming property of an aluminum alloy tube is greatly improved under ultra-low temperature conditions, a tube is cooled and pressurized in a die through an ultra-low temperature medium, so that the tube forms a special-shaped tubular component at an ultra-low temperature. In the method for pressure forming of an aluminum alloy special-shaped tubular component by using an ultra-low temperature medium, the ultra-low temperature medium is not only used for cooling the die and the tube, but also used for pressurization to achieve flexible loading of the tube, which is favorable for forming complex special-shaped tubular components with varied cross-sections.

Some embodiments of the disclosure provide methods and systems for controlling dimensions of metal hydroformed parts. According to an embodiment, a control method includes: obtaining an inner cavity volume of a target part and an inner cavity volume of a tube blank; injecting a liquid into the tube blank under a high pressure condition; determining a liquid volume compression compensation quantity according to the inner cavity volume of the target part; determining a liquid volume increment-target part corner radius relationship according to the inner cavity volume of the target part, the inner cavity volume of the tube blank, and the liquid volume compression compensation quantity; determining a liquid volume increment according to the liquid volume increment-target part corner radius relationship; and controlling dimensions of a metal hydroformed part according to the liquid volume increment.

Some embodiments of the disclosure provide methods and systems for controlling dimensions of metal hydroformed parts. According to an embodiment, a control method includes: obtaining an inner cavity volume of a target part and an inner cavity volume of a tube blank; injecting a liquid into the tube blank under a high pressure condition; determining a liquid volume compression compensation quantity according to the inner cavity volume of the target part; determining a liquid volume increment-target part corner radius relationship according to the inner cavity volume of the target part, the inner cavity volume of the tube blank, and the liquid volume compression compensation quantity; determining a liquid volume increment according to the liquid volume increment-target part corner radius relationship; and controlling dimensions of a metal hydroformed part according to the liquid volume increment.

A tailor-layered tube, includes an inner tube, an outer tube having a greater diameter than the inner tube and disposed outside the inner tube, and at least one intermediate tube disposed between the inner tube and the outer tube and having a length different from the inner tube and the outer tube to be locally disposed between the inner tube and the outer tube. The inner tube, the intermediate tube, and the outer tube are hydroformed in a state of being laminated so that the inner tube, the intermediate tube, and the outer tube are sequentially brought into close contact with each other in a region where the intermediate tube is disposed and the inner tube is brought into direct contact with the outer tube in a region where the intermediate tube does not exist, and accordingly regions having locally different thicknesses are successively arranged.

A forming device includes: a first cavity portion in which a pipe portion is formed and a second cavity portion in which a flange portion is formed, the first cavity portion and the second cavity portion being formed between a first die and a second die; a flange adjusting member which is capable of being advanced into the second cavity portion and is capable of being retreated from the second cavity portion, and which adjusts a length of the flange portion; and a control unit. The control unit sequentially performs a first control of allowing the flange adjusting member to be advanced into the second cavity portion, a second control of allowing the gas supply unit to supply a gas so as to temporarily form the flange portion, and a third control of allowing the flange adjusting member to be retreated from the second cavity portion.

A forming device includes: a first cavity portion in which a pipe portion is formed and a second cavity portion in which a flange portion is formed, the first cavity portion and the second cavity portion being formed between a first die and a second die; a flange adjusting member which is capable of being advanced into the second cavity portion and is capable of being retreated from the second cavity portion, and which adjusts a length of the flange portion; and a control unit. The control unit sequentially performs a first control of allowing the flange adjusting member to be advanced into the second cavity portion, a second control of allowing the gas supply unit to supply a gas so as to temporarily form the flange portion, and a third control of allowing the flange adjusting member to be retreated from the second cavity portion.

A forming device that forms a metal pipe by blow forming includes: a gas supply part that supplies a gas to a metal pipe material to expand the metal pipe material; a die attachment part to which a die that is brought into contact with the expanded metal pipe material to form the metal pipe is attached; a gas discharge part that discharges the gas from the metal pipe material; and a pressure detector that detects a pressure of the gas, the gas supply part includes a gas compression part that compresses the gas, and a supply line that transfers the gas compressed by the gas compression part to the metal pipe material, the gas discharge part includes a discharge line that transfers the discharged gas, and the pressure detector is provided in each of the supply line and the discharge line.