Computer-Controlled Multiaxial Forging
Inactive Publication Date: 2015-04-02
COLLEGE OF DUNAUJVAROS
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Benefits of technology
This patent describes a method and apparatus for computer-controlled multiaxial forging, which involves shaping a workpiece by using a pair of forging dies moving along a first axis and rotating the workpiece around a second axis. The process involves finding the surfaces of the workpiece to be shaped, adjusting the position of the dies to achieve a predetermined contact force, and calculating the z-directional width of the workpiece before the actual shaping step. The method and apparatus can be used for manufacturing various products through a computer-controlled forging process.
Problems solved by technology
A drawback of the above mentioned conventional control of advancing is that the position of the surfaces of the workpiece in the direction of tool motion, i.e. in z-direction, is known only in the first forging step, meaning that the extent of the z-directional deformation associated with the shaping to be carried out can be exactly specified only in this case.
This raises a problem because neither the effect nor the extent of the shaping to the microstructure of the material of the workpiece 4 and to the mechanical properties of the workpiece 4 can be precisely determined.
Method used
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[0028]The main steps of the method according to the invention are shown in the flow diagram of FIG. 3. A key feature of the method is that the actual z-directional width of the workpiece is determined not only once, at the very starting of the forging process, but before each forging step.
[0029]In a first step S100 of the method, the surfaces of the workpiece to be shaped are found by using the working surfaces of the dies in so manner that the dies are advanced by predetermined intervals f to the respective surfaces of the workpiece to be shaped until the specific predetermined contact forces FR, and FL associated with the right-sided and left-sided pistons, respectively, are reached. The length of the advancing intervals f may, for example, be the above mentioned 0.001 or 0.002 mm in laboratory conditions, but in an industrial environment it may have a value of several orders higher. The displacement positions of the opposite dies, which positions are provided by the position sens...
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Abstract
A computer-based apparatus for performing a multiaxial forging method is disclosed. The apparatus comprises a process control computer and a pair of forging dies connected thereto, wherein each of the dies comprises a piston (1, 2), said pistons being moveable along a common axis (z), and wherein a shaping anvil (3) is mounted on each of the pistons (1, 2), and the pistons (1, 2) are equipped with position measuring sensors. The apparatus further comprises a measuring instrument (20) attached to the pistons (1, 2) of the dies for directly measuring the distance between the two pistons (1, 2) at a location adjacent to the workpiece.
Description
FIELD OF THE INVENTION[0001]The present invention relates to a method of computer-controlled multiaxial forging, an apparatus for carrying out the method, and a non-transitory computer program product storing a computer program for carrying out the method.BACKGROUND ART[0002]In the computer-controlled multiaxial forging, a workpiece to be forged is shaped along its one or more axis by means of forging dies moveable along a tool axis. The forging dies are moved by hydraulic pistons in a manner that the extent of displacement of each die (anvil) is determined according to the dimensions of the surfaces of the workpiece to be forged. When a workpiece is subject to a multiaxial shaping, the gripped workpiece is to be rotated around an axis perpendicular to the axis of the tool motion during the forging process. The angles of rotation depend on the shape of the surface to be produced. In order to avoid causing damage in the dies by the workpiece when the workpiece is being rotated betwee...
Claims
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IPC IPC(8): B21J5/02
CPCB21J5/02B21J1/025B21J7/14
Inventor BERECZKI, PETER
Owner COLLEGE OF DUNAUJVAROS