A power conversion device and a press apparatus capable of preventing an excessive current in a DC-link capacitor are provided. The power conversion device 10 includes a voltage-doubling rectifier circuit 12. In the voltage-doubling rectifier circuit 12, in a voltage-doubling rectification mode, a common connection node Nc between two capacitors 102a and 102b is connected to a predetermined node. A current detector circuit 107 detects a switching current (IL) flowing in the switching elements SW1 and SW2, and a current detector circuit 108 detects a load current Ild of a load 15. In a mode switching period from a full-wave rectification mode to a voltage-doubling rectification mode, a controller circuit 110 controls the switching of the switching elements SW1 and SW2, based on the switching current (IL) and the load current Ild.

A power conversion device and a press apparatus capable of preventing an excessive current in a DC-link capacitor are provided. The power conversion device 10 includes a voltage-doubling rectifier circuit 12. In the voltage-doubling rectifier circuit 12, in a voltage-doubling rectification mode, a common connection node Nc between two capacitors 102a and 102b is connected to a predetermined node. A current detector circuit 107 detects a switching current (IL) flowing in the switching elements SW1 and SW2, and a current detector circuit 108 detects a load current Ild of a load 15. In a mode switching period from a full-wave rectification mode to a voltage-doubling rectification mode, a controller circuit 110 controls the switching of the switching elements SW1 and SW2, based on the switching current (IL) and the load current Ild.

Methods and apparatus to monitor conditioning machines are disclosed herein. An example system includes a plurality of work rolls to process a continuous strip material positioned between an entry and an exit of an apparatus. A sensor determines a measured distance between an upper surface of the strip material and a reference location, where the sensor is downstream from the exit of the apparatus. A controller determines a difference value between the measured distance and a predetermined distance to detect material curvature in the strip material.

The present invention discloses a method for synchronously processing dual belt materials. The method comprises steps of feeding, processing, detecting, assembling and outputting finished products. The step of feeding materials comprises cleaning, dividing materials, positioning and feeding. The step of assembling comprises pushing and assembling. A dual-belt-material feeder is used for feeding, and a dual-belt-material mold is used for punching. The dual-belt-material feeder (1) comprises a moving feeding device (11), a fixed feeding device (13) and two guide frames (14). The dual-belt-material mold comprises two punching molds. The beneficial effects of the method for synchronously processing dual belt materials are that: the method can be used for producing thin wall miniature assembly parts in a single line and assembling the thin wall miniature assembly parts on line, so that problems caused by that the thin wall miniature assembly parts are produced in two production lines can be avoided.

The present invention discloses a method for synchronously processing dual belt materials. The method comprises steps of feeding, processing, detecting, assembling and outputting finished products. The step of feeding materials comprises cleaning, dividing materials, positioning and feeding. The step of assembling comprises pushing and assembling. A dual-belt-material feeder is used for feeding, and a dual-belt-material mold is used for punching. The dual-belt-material feeder (1) comprises a moving feeding device (11), a fixed feeding device (13) and two guide frames (14). The dual-belt-material mold comprises two punching molds. The beneficial effects of the method for synchronously processing dual belt materials are that: the method can be used for producing thin wall miniature assembly parts in a single line and assembling the thin wall miniature assembly parts on line, so that problems caused by that the thin wall miniature assembly parts are produced in two production lines can be avoided.

A forming tool and a method of operating thereof for producing a hollow component by sheet-metal forming is disclosed having an upper tool and a lower tool, a mandrel that is driven into the hollow component to be formed and an auxiliary mandrel that is repositionable relative to the mandrel are positioned on the upper tool. The mandrel and the auxiliary mandrel are coupled to the upper tool by one spring-elastic actuation element in such a manner that the mandrel, when the upper tool is being lowered, is driven into the hollow component to be formed and comes to bear therein. A further lowering of the upper tool causes a compression of the coupling element, and the auxiliary mandrel carrying out a movement relative to the mandrel and being driven further into the hollow component.

A forming tool and a method of operating thereof for producing a hollow component by sheet-metal forming is disclosed having an upper tool and a lower tool, a mandrel that is driven into the hollow component to be formed and an auxiliary mandrel that is repositionable relative to the mandrel are positioned on the upper tool. The mandrel and the auxiliary mandrel are coupled to the upper tool by one spring-elastic actuation element in such a manner that the mandrel, when the upper tool is being lowered, is driven into the hollow component to be formed and comes to bear therein. A further lowering of the upper tool causes a compression of the coupling element, and the auxiliary mandrel carrying out a movement relative to the mandrel and being driven further into the hollow component.

A die-pressing die used for die-pressing a workpiece includes a die body on whose upper face a die hole is formed and on whose bottom face a discharge hole for discharging dusts of the workpiece is formed, and a roller unit disposed within the die hole and having a roller protruding upward from the upper face of the die body. A collection passage for collecting the dusts is formed at a peripheral edge portion of the die hole. One end of the collection passage is opened at the upper face of the die body, and another end thereof is opened to the discharge hole. The collection passage is configured to suction air due to a negative pressure state in the discharge hole.

A die-pressing die used for die-pressing a workpiece includes a die body on whose upper face a die hole is formed and on whose bottom face a discharge hole for discharging dusts of the workpiece is formed, and a roller unit disposed within the die hole and having a roller protruding upward from the upper face of the die body. A collection passage for collecting the dusts is formed at a peripheral edge portion of the die hole. One end of the collection passage is opened at the upper face of the die body, and another end thereof is opened to the discharge hole. The collection passage is configured to suction air due to a negative pressure state in the discharge hole.

The present invention discloses a current-assisted composite spinning forming device and method for deep cup-shaped thin-walled parts is provided, comprising a spinning mandrel, a tailstock, and a plurality of rollers evenly distributed on the circumference of the spinning mandrel; the rollers are arranged in a staggered manner in the axial and radial directions of the spinning mandrel, and the roller surface of each roller comprises a deep drawing roller surface, a flow spinning section, and a shaping roller surface, wherein the staggered arrangement means that the deep drawing roller surfaces, the flow spinning sections and the shaping roller surfaces of the rollers are distributed in a staggered manner in the axial and radial directions of the spinning mandrel. In the spinning process, with different arc-shaped surface shapes and structures of the rollers for deep drawing spinning, the rollers focus on applying pressure to different portions of a blank in the period of each revolution of the spinning mandrel, which is beneficial to increase the pass reduction and reduce the spinning pass. This can not only improve the production efficiency, but also contribute to reducing defects such as material rupture and unusability due to hardening of the workpiece that is caused by the discontinuous material forming process.