The present invention discloses a manufacturing method of an unequal-torque coil spring and a manufacturing machine thereof for a curtain spring motor, providing a feedback torque that corresponds to an actual requirement from different stages in a curtain-folding working process, so that when the curtain is folded back, the torque can be used to stabilize the speed of folding back the curtain, and the lower beam of the curtain can be fixed at any heights as the curtain is lowered.

A metal roof panel includes a rib with a unique shape. The rib is bilateral with upwardly angled sides that each transition into an indentation, with both indentations transitioning into a central flat apex. Between each rib is a channel, preferably including at least one raised surface. The lower surface of the channel between the raised surfaces, and the top of the raised surfaces, are substantially planar and parallel to the flat surface of the apex of the panel. A unique method of manufacturing the roof panel employs a roll machine configured to shape a piece of sheet metal into the roof panel by modifying the shape in many small increments, which allows the final product to have a fairly intricate bend pattern.

A roller tool for a machine tool for the linear forming of a metal sheet comprises a housing, a tool head which for reversibly interacting with a ram of the machine tool is mounted so as to be rotatable relative to the housing about a tool longitudinal axis, having an impact face for transmitting a contact pressure force that is oriented so as to be parallel to the tool longitudinal axis from the ram to the tool head, and a rotary engagement for transmitting a rotating movement about the tool longitudinal axis from the ram to the tool head, and a roller installation for interacting with the metal sheet, having at least one roller body that is capable of being rotatingly driven by way of the tool head.

A roller tool for a machine tool for the linear forming of a metal sheet comprises a housing, a tool head which for reversibly interacting with a ram of the machine tool is mounted so as to be rotatable relative to the housing about a tool longitudinal axis, having an impact face for transmitting a contact pressure force that is oriented so as to be parallel to the tool longitudinal axis from the ram to the tool head, and a rotary engagement for transmitting a rotating movement about the tool longitudinal axis from the ram to the tool head, and a roller installation for interacting with the metal sheet, having at least one roller body that is capable of being rotatingly driven by way of the tool head.

A method for deriving the position of a pushing roll, applied even when there is a difference between the actual processed shape and a theoretical solution (a numerical analysis solution) due to changes in a state of a processing machine or the bending characteristic of the material to be processed. The rolls have a pyramid-like shape, and the operation amount of a pushing roll is changed while continuously feeding a material, thereby bending the material. Also, for each position of the fixed pushing roll, the radius of curvature of the material is measured and the bending characteristic is grasped in advance. From the design shape, the radius of curvature and the operation amount for bringing the pushing roll into contact are obtained. The operation amount of the pushing roll is then determined.

A method for deriving the position of a pushing roll, applied even when there is a difference between the actual processed shape and a theoretical solution (a numerical analysis solution) due to changes in a state of a processing machine or the bending characteristic of the material to be processed. The rolls have a pyramid-like shape, and the operation amount of a pushing roll is changed while continuously feeding a material, thereby bending the material. Also, for each position of the fixed pushing roll, the radius of curvature of the material is measured and the bending characteristic is grasped in advance. From the design shape, the radius of curvature and the operation amount for bringing the pushing roll into contact are obtained. The operation amount of the pushing roll is then determined.

A metal roof panel includes a rib with a unique shape. The rib is bilateral with upwardly angled sides that each transition into an indentation, with both indentations transitioning into a central flat apex. Between each rib is a channel, preferably including at least one raised surface. The lower surface of the channel between the raised surfaces, and the top of the raised surfaces, are substantially planar and parallel to the flat surface of the apex of the panel. A unique method of manufacturing the roof panel employs a roll machine configured to shape a piece of sheet metal into the roof panel by modifying the shape in many small increments, which allows the final product to have a fairly intricate bend pattern.

A hydraulic roll bending machine includes a frame, a plate roller rotatably connected to the frame, a hydraulic power unit associated with the frame, and a network of conduits fluidly connected to a main feed of hydraulic fluid and a main return of hydraulic fluid of the hydraulic power unit. At least one hydraulic actuator having a housing is associated with the plate roller. The housing forms one or more fluid passages therein that are fluidly connected with activation chambers of the at least one hydraulic actuator. A valve system is connected onto the housing and is in selective fluid communication fluid passages and also with the network of conduits. The valve system is arranged to selectively fluidly interconnect the one or more passages with the network of conduits to operate the at least one hydraulic actuator.

A hydraulic roll bending machine includes a frame, a plate roller rotatably connected to the frame, a hydraulic power unit associated with the frame, and a network of conduits fluidly connected to a main feed of hydraulic fluid and a main return of hydraulic fluid of the hydraulic power unit. At least one hydraulic actuator having a housing is associated with the plate roller. The housing forms one or more fluid passages therein that are fluidly connected with activation chambers of the at least one hydraulic actuator. A valve system is connected onto the housing and is in selective fluid communication fluid passages and also with the network of conduits. The valve system is arranged to selectively fluidly interconnect the one or more passages with the network of conduits to operate the at least one hydraulic actuator.

Method for forming tubular segments, wherein a metal strip is or a series of metal strips is pressed into a tubular or truncated conical shape, such that opposite longitudinal ends of the strip or strips meet, forming at least one seam, where after the seam is welded, joining the meeting ends together, wherein at least after welding the cross sectional profile of at least part of the segment is measured, at least at and/or near said welded seam or seams, and data of said measurement is fed into a control unit, where after a press is operated by the control unit based on said data, adjusting the cross sectional profile of the segment, at least at the or each seam.