Tube forming methods can be used for efficient transition in the production of tubes having varying thickness. Material used to form consecutive tubes may have the same thickness along a separation plane separating a first discrete section from a second discrete section of the material, and the first discrete section and the second discrete section may each have varying thickness in a feed direction of the material. With such a thickness profile, the first discrete section of the material may be formed into a first cylinder having varying thickness and separated from the second discrete portion as the second discrete section is formed into a second cylinder having varying thickness. In particular, the transition between the first cylinder and the second cylinder may be achieved without scrap and/or interruption, resulting in cost-savings and improvements in production throughput associated with forming tubes having varying thickness.

Tube forming methods can be used for efficient transition in the production of tubes having varying thickness. Material used to form consecutive tubes may have the same thickness along a separation plane separating a first discrete section from a second discrete section of the material, and the first discrete section and the second discrete section may each have varying thickness in a feed direction of the material. With such a thickness profile, the first discrete section of the material may be formed into a first cylinder having varying thickness and separated from the second discrete portion as the second discrete section is formed into a second cylinder having varying thickness. In particular, the transition between the first cylinder and the second cylinder may be achieved without scrap and/or interruption, resulting in cost-savings and improvements in production throughput associated with forming tubes having varying thickness.

An extruded material includes a peripheral wall having a closed loop-shaped cross-section and defining a hollow, and a middle rib connected to an inner peripheral surface of the peripheral wall and dividing the hollow. The extruded material is provided with a corrected portion set at a predetermined portion in a longitudinal direction and subjected to correction processing, and an uncorrected portion not subjected to the correction processing. The peripheral wall is expanded outward with respect to an original shape of the uncorrected portion in the corrected portion. While the middle rib is curved with respect to an imaginary straight line connecting connecting portions connected with the peripheral wall at both end portions of the middle rib in the uncorrected portion, the middle rib has a smaller degree of curvature than the original shape of the uncorrected portion in the corrected portion.

Tube forming methods can be used for efficient transition in the production of tubes having varying thickness. Material used to form consecutive tubes may have the same thickness along a separation plane separating a first discrete section from a second discrete section of the material, and the first discrete section and the second discrete section may each have varying thickness in a feed direction of the material. With such a thickness profile, the first discrete section of the material may be formed into a first cylinder having varying thickness and separated from the second discrete portion as the second discrete section is formed into a second cylinder having varying thickness. In particular, the transition between the first cylinder and the second cylinder may be achieved without scrap and/or interruption, resulting in cost-savings and improvements in production throughput associated with forming tubes having varying thickness.

A method for manufacturing a refrigerant guide tube of a heat exchanger and a refrigerant guide tube manufactured using the method and a heat exchanger with the refrigerant guide tube are disclosed. The refrigerant guide tube includes tube body and channels extending through a wall of the tube body. The tube body is formed by a butt joint of side edges of more than one bar-shaped plate materials along the length direction. The method allows forming the refrigerant channels of the guide tube before or during forming the tube body when the method is used to manufacture the guide tube, so as to avoid directly forming the channels on the tube body and make the process of manufacture the guide tube simpler and more convenient.

A metal pipe having at least one smooth portion and at least one grooved portion is obtained by progressive deformation of its wall in at least two consecutive phases. Each phase is carried out using a tool assembly including a grooved female die that accommodates the portion of pipe being deformed, and a grooved male punch that moves axially in order to give the pipe a cross section with an undulating profile, defining longitudinal ribs distributed around the pipe. The majority of the ribs each have a width in the circumferential direction that is less than the distance in the circumferential direction from one rib to the next. The pipe is subjected to a further deformation step in order to force the flanks of each rib into contact with each other using a tool assembly that includes radially movable sectors or a bushing that supports a plurality of radial rollers.

A support structure may include a metallic tube having two opposing ends. The first end may have a first length, a first wall thickness, and a first outer diameter. The second end may have a second length, a second wall thickness, and a second outer diameter. A transition area may be disposed between the first length and the second length. The first wall thickness may be greater than the second wall thickness thereby providing variable thickness.

Provided is a hydraulic actuator shell and a preparation method. The hydraulic actuator shell comprises a foam metal sandwich composite pipe, a foam metal sandwich flange and a foam metal sandwich end cover; the foam metal sandwich composite pipe is connected with one end of the foam metal sandwich flange, and the foam metal sandwich end cover is connected with the other end of the foam metal sandwich flange; the foam metal sandwich composite pipe comprises a first metal pipe layer, a first foam metal layer and a second metal pipe layer sequentially arranged from inside to outside; and a first bonding interface among the first metal pipe layer, the first foam metal layer and the second metal pipe layer is a metallurgical bonding interface. The hydraulic actuator shell is used for improving compression resistance, corrosion resistance and vibration and noise reduction capabilities of the hydraulic actuator shell.