Disclosed is a method for forming a tube with high internal pressure and low external pressure. The method comprises: putting a tube to be formed into a cavity, such that a bulging area (15) is formed between the tube to be formed and an inner wall of the cavity; continuously injecting a low-pressure fluid into the bulging area, and then injecting a high-pressure fluid into the interior of the tube to be formed, the high-pressure fluid creating a pressure on an outer wall of the tube to be formed such that the tube to be formed starts to expand to the bulging area; stopping the supply of the low-pressure fluid when the tube is bulged to conform to the inner wall of the cavity; and taking the formed tube out to complete a working cycle. Further disclosed is a forming machine for forming a tube according to the above method. According to the machine for forming a tube with high internal pressure and low external pressure, a mold body (1) is provided with a first through hole (13) and a second through hole (14) for circulating a low-pressure fluid into and out of a bulging area, so as to create a certain pressure P1 on the tube and ensure uniform bulging of the entire tube, thereby achieving a better forming effect.

Disclosed is a method for forming a tube with high internal pressure and low external pressure. The method comprises: putting a tube to be formed into a cavity, such that a bulging area (15) is formed between the tube to be formed and an inner wall of the cavity; continuously injecting a low-pressure fluid into the bulging area, and then injecting a high-pressure fluid into the interior of the tube to be formed, the high-pressure fluid creating a pressure on an outer wall of the tube to be formed such that the tube to be formed starts to expand to the bulging area; stopping the supply of the low-pressure fluid when the tube is bulged to conform to the inner wall of the cavity; and taking the formed tube out to complete a working cycle. Further disclosed is a forming machine for forming a tube according to the above method. According to the machine for forming a tube with high internal pressure and low external pressure, a mold body (1) is provided with a first through hole (13) and a second through hole (14) for circulating a low-pressure fluid into and out of a bulging area, so as to create a certain pressure P1 on the tube and ensure uniform bulging of the entire tube, thereby achieving a better forming effect.

Methods for expanding a tube to create a tight fit or an interference fit with one or more fins for the manufacture of a heat exchanger are disclosed. The methods can include providing an internal pressure to the tubes in a successive pulsing manner with each pulse having a short duration. The methods can include creating a temperature differential between the bend sections of the tubes and the straight sections of the tubes such that the bend section has a lower temperature than the straight sections. The methods can include creating an external pressure differential between the bend sections of the tubes and the straight sections of the tubes such that the external pressure acting on the bend sections is greater than the external pressure acting on the straight sections.

A method for shaping a blank comprising a metal includes a step of loading the blank onto a first die, a step of bringing the first die and a second die together, a step of forming a seal around the blank, and a step of injecting a pressurized molten salt into a space in the blank to supply a hydraulic pressure to the blank.

A method for shaping a blank comprising a metal includes a step of loading the blank onto a first die, a step of bringing the first die and a second die together, a step of forming a seal around the blank, and a step of injecting a pressurized molten salt into a space in the blank to supply a hydraulic pressure to the blank.

Provided is a display device for a forming device that forms a heated metal material using a metal member. The display device proposes and displays a variable parameter that is adjustable.

Provided is a display device for a forming device that forms a heated metal material using a metal member. The display device proposes and displays a variable parameter that is adjustable.

A bending apparatus for coiled tubing protects along the entire path of coiled tubing from the reel to the injector, while still protecting a main controlled bend to the injector. The bending apparatus includes a conduit having a bend portion and a flexible portion. The main controlled bend is isolated in the bend portion, while smaller adjustment bends can be designated for the flexible portion. An impingement sleeve further protects and support coiled tubing within the conduit. The bend portion can be defined by an exterior support for the stability and strength of the bend portion, when the entire conduit is made of flexible material. A threader provides for safe loading from the reel to the conduit. A buckle preventer can be added to prevent damage after exiting the conduit. A blowout preventer can be added to cut and isolate the coiled tubing between the conduit and the reel.

A bending apparatus for coiled tubing protects along the entire path of coiled tubing from the reel to the injector, while still protecting a main controlled bend to the injector. The bending apparatus includes a conduit having a bend portion and a flexible portion. The main controlled bend is isolated in the bend portion, while smaller adjustment bends can be designated for the flexible portion. An impingement sleeve further protects and support coiled tubing within the conduit. The bend portion can be defined by an exterior support for the stability and strength of the bend portion, when the entire conduit is made of flexible material. A threader provides for safe loading from the reel to the conduit. A buckle preventer can be added to prevent damage after exiting the conduit. A blowout preventer can be added to cut and isolate the coiled tubing between the conduit and the reel.

A forming apparatus that forms a metal pipe material includes an electrode that holds the metal pipe material and supplies electric power to the metal pipe material to heat the metal pipe material, a forming die that quenches and forms the expanded metal pipe, and a member that suppresses quenching, in which a region where quenching is not performed in the metal pipe is adjusted by adjusting a length of the member.