A precision forging method includes arranging a metal material in a die cavity so that a distal end surface of a wall portion of the metal material is opposed toward a stopper and a bottom portion of the metal material is opposed toward a punch. Further, the precision forging method includes moving the punch, which includes a cutting blade on an edge of a working end surface, in the die cavity to cut part of the wall portion thickness-wise with the cutting blade and cause shear deformation in the cut portion.

A precision forging method includes arranging a metal material in a die cavity so that a distal end surface of a wall portion of the metal material is opposed toward a stopper and a bottom portion of the metal material is opposed toward a punch. Further, the precision forging method includes moving the punch, which includes a cutting blade on an edge of a working end surface, in the die cavity to cut part of the wall portion thickness-wise with the cutting blade and cause shear deformation in the cut portion.

A method for automatic pass schedule calculation during forging, in particular radial forging, of stepped shafts made of metal workpieces, in particular steel, in a forging machine, preferably a radial forging machine with at least four forging tools arranged around the circumference of the workpiece, which are set up and adapted for simultaneous forging the workpiece and/or the stepped shaft, includes: entering starting parameters for the forging process, preferably radial forging process, into a pass schedule calculation program; specifying target parameters for the forging process, preferably radial forging process; and calculating, by the pass schedule calculation program, based on these start and target parameters, a pass plan or calculated a forge sequence. A control and/or regulation unit and a forging machine for carrying out the method are disclosed.

A method for automatic pass schedule calculation during forging, in particular radial forging, of stepped shafts made of metal workpieces, in particular steel, in a forging machine, preferably a radial forging machine with at least four forging tools arranged around the circumference of the workpiece, which are set up and adapted for simultaneous forging the workpiece and/or the stepped shaft, includes: entering starting parameters for the forging process, preferably radial forging process, into a pass schedule calculation program; specifying target parameters for the forging process, preferably radial forging process; and calculating, by the pass schedule calculation program, based on these start and target parameters, a pass plan or calculated a forge sequence. A control and/or regulation unit and a forging machine for carrying out the method are disclosed.

Radial forging of long products made of metal workpieces in a radial forging machine uses at least four forging tools arranged around the circumference of the workpiece, which are set up and adapted to simultaneously carry out the forging operation. An automatic pass schedule calculation includes entering start parameters for the radial forging process into a pass schedule calculation program and defining target parameters for the radial forging process. The pass schedule calculation program calculates a pass schedule or a forging sequence based on these start and target parameters. The pass schedule calculation program determines a temperature variation and the temperature distribution over the cross section of the long product and takes into account the change in shape during radial forging.

Radial forging of long products made of metal workpieces in a radial forging machine uses at least four forging tools arranged around the circumference of the workpiece, which are set up and adapted to simultaneously carry out the forging operation. An automatic pass schedule calculation includes entering start parameters for the radial forging process into a pass schedule calculation program and defining target parameters for the radial forging process. The pass schedule calculation program calculates a pass schedule or a forging sequence based on these start and target parameters. The pass schedule calculation program determines a temperature variation and the temperature distribution over the cross section of the long product and takes into account the change in shape during radial forging.

A method for automatic calculation of a pass schedule in the radial forging of steel tubes in a radial forging machine is disclosed. The forging machine includes at least four forging tools arranged around the circumference of the workpiece, which are set up and adapted for synchronous forging operation over at least a partial length of the workpiece and/or the tube. Starting parameters for the forging process, preferably radial forging process, are entered into a pass plan calculation program and target parameters for the radial forging process are defined. The pass plan calculation program calculates a pass plan or a forging sequence on the basis of these start and target parameters.

A method for automatic calculation of a pass schedule in the radial forging of steel tubes in a radial forging machine is disclosed. The forging machine includes at least four forging tools arranged around the circumference of the workpiece, which are set up and adapted for synchronous forging operation over at least a partial length of the workpiece and/or the tube. Starting parameters for the forging process, preferably radial forging process, are entered into a pass plan calculation program and target parameters for the radial forging process are defined. The pass plan calculation program calculates a pass plan or a forging sequence on the basis of these start and target parameters.

With respect to the manufacture of cylindrical rolling bodies, excess material on an outside section in the radial direction and recesses in both end surfaces in the axial direction are not generated as much as possible in the intermediate material that is removed from a molding device for performing compression molding. Annular concave sections 27 are provided on the inner-circumferential surfaces 20a of molding concave sections 19a provided in a stationary-side mold 17a and a movable-side mold 18a. The stationary-side mold 17a and the movable-side mold 18a are brought close to each other in the axial direction while compressing the intermediate material 23 in a state in which both side sections in the axial direction of the intermediate material 23 are inserted into the molding concave sections 19a. At this time, a part of the material of the intermediate material 23 is made to enter inside the annular concave sections 27, and undercut sections 32 are formed on the outer side in the radial direction of a compression-molded intermediate material 23b. After that, when removing both side sections in the axial direction of the intermediate material 23b from the inside of the molding concave sections 19a in the axial direction, the undercut sections 32 are drawn through or handled by stepped sections 29 existing at the end sections in the axial direction of the annular concave sections 27.

With respect to the manufacture of cylindrical rolling bodies, excess material on an outside section in the radial direction and recesses in both end surfaces in the axial direction are not generated as much as possible in the intermediate material that is removed from a molding device for performing compression molding. Annular concave sections 27 are provided on the inner-circumferential surfaces 20a of molding concave sections 19a provided in a stationary-side mold 17a and a movable-side mold 18a. The stationary-side mold 17a and the movable-side mold 18a are brought close to each other in the axial direction while compressing the intermediate material 23 in a state in which both side sections in the axial direction of the intermediate material 23 are inserted into the molding concave sections 19a. At this time, a part of the material of the intermediate material 23 is made to enter inside the annular concave sections 27, and undercut sections 32 are formed on the outer side in the radial direction of a compression-molded intermediate material 23b. After that, when removing both side sections in the axial direction of the intermediate material 23b from the inside of the molding concave sections 19a in the axial direction, the undercut sections 32 are drawn through or handled by stepped sections 29 existing at the end sections in the axial direction of the annular concave sections 27.