The present invention discloses a special hydraulic press for bulging pressing forming of an automobile axle housing and a pressing forming method. A hydraulic press body is a closed frame consisting of an upper cross beam, a lower cross beam, four stand columns I, II, III, and IV, four vertical pull rods I, II, III, and IV, and four transverse pull rods I, II, III, and IV, and is used for balancing a deformation force up to 3000 T in the vertical direction or the horizontal direction in the pressing forming process. During pressing forming, the downward speeds of a main hydraulic cylinder, small left and right vertical hydraulic cylinders are precisely controlled to prevent the left end, the right end and the middle of the tube blank from bending.

A forming apparatus includes: an upper die and a lower die having forming surfaces corresponding to outer surfaces of a pipe with protrusions; a moving mechanism that moves the upper die and the lower die such that a forming space for forming the pipe with protrusions is defined between the forming surfaces of the upper die and the lower die; and a gas supply unit that supplies gas to a forming material to expand the forming material. A control unit controls the movement of the upper die and the lower die by the moving mechanism and the supply of gas to the forming material by the gas supply unit such that the forming material is formed into the pipe with protrusions in the forming space.

A forming apparatus includes: an upper die and a lower die having forming surfaces corresponding to outer surfaces of a pipe with protrusions; a moving mechanism that moves the upper die and the lower die such that a forming space for forming the pipe with protrusions is defined between the forming surfaces of the upper die and the lower die; and a gas supply unit that supplies gas to a forming material to expand the forming material. A control unit controls the movement of the upper die and the lower die by the moving mechanism and the supply of gas to the forming material by the gas supply unit such that the forming material is formed into the pipe with protrusions in the forming space.

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.

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.

A bending apparatus for coiled tubing protects the entire path of coiled tubing from the reel to the injector, while still protecting a main controlled bend from the reel 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 a smaller adjustment bend is designed for the flexible portion. The changes in the upright angle from dispensing coiled tubing from different levels of the reel no longer cause damage. The changes in the lateral angle from dispensing coiled tubing from both sides of the reel no longer cause damage. A table mount can also be added to allow more adjustment for changes in the lateral angle.

A bending apparatus for coiled tubing protects the entire path of coiled tubing from the reel to the injector, while still protecting a main controlled bend from the reel 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 a smaller adjustment bend is designed for the flexible portion. The changes in the upright angle from dispensing coiled tubing from different levels of the reel no longer cause damage. The changes in the lateral angle from dispensing coiled tubing from both sides of the reel no longer cause damage. A table mount can also be added to allow more adjustment for changes in the lateral angle.

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.