Method for controlling local force in die for sheet stamping and special fixture for its implementation

摘要

The present invention relates to the manufacture of machines related to metal forming, and can be used in dies for sheet stamping to control local forces under certain algorithms. The technical object of the present invention is to increase the technical capability of the sheet stamping process and the accuracy of manufacturing parts and to increase the possibility of use for general purpose equipment. The above problem is solved by installing a special fixing device on the die, and this device regulates the flow of the metal sheet through control of the local force while forming the workpiece, while ensuring the movement from the periphery to the deformation zone. It is configured to. The special fixing device has a fixing part composed of a plurality of sectors fixed to the plate, and each fixing part is equipped with a hydraulic device for transmitting force under a specific algorithm. The special fixing device includes a hydraulic device for transmitting a force under a specific algorithm, preferably comprising a housing, a stem with a piston, the housing comprising a ring having an inner surface composed of a variable cross section, and the piston outer peripheral surface Together they form a gap that can fluctuate while moving the piston relative to the housing. Further, the special fixing device may include a hydraulic device for transmitting a force under a specific algorithm, consisting of a stem with a housing and a piston, the stem being hollow and having a radial hole, the piston having a piston hole A movable ring configured to be closed is provided, the housing includes an axle composed of a variable cross section, one end of which is made in the form of a piston disposed in the stem cavity, and is moved by a movable ring together with an axle composed of a variable cross section. It is characterized by forming a hollow stem with a piston and a variable gap while moving the ring relative to the axle.