Provided is a Ni-based alloy for hot forging die having high compressive strength at high temperature and good oxidation resistance that is capable of suppressing work environment deterioration and shape deterioration. A Ni-based alloy for hot forging die in the present invention includes, by mass, 7.0 to 12.0% W, 4.0 to 11.0% Mo, 5.0 to 7.5% Al, and 0.5 to 7.5% Cr, and the balance of Ni with inevitable impurities. In addition, the Ni-based alloy for hot forging die may further include 0.5 to 7.0% by mass Ta and may further include one or more elements selected from, by mass, 0.001 to 0.5% Zr, 0.001 to 0.5% Hf, 0.001 to 0.2% a rare-earth element, 0.001 to 0.2% Y, and 0.001 to 0.03% Mg. The Ni-based alloy for hot forging die may have a 0.2% compressive proof strength of at least 500 MPa at a test temperature of 1000 C. and a strain rate of 10.sup.3/sec.

A steel material is heated and punched while tension is applied to the steel material (2) in at least one direction along a surface of the steel material between first and second portions of the steel material distant from each other with forming unit posed therebetween. The tension is applied to increase a distance between the first and second portions of the steel material by a length corresponding to an amount by which the distance between the first and second portions of the steel material thermally expands as the steel material is heated to the temperature in the step of heating and punching. The forming unit includes a first die for punching the steel material and a second die facing the first die, the first die or the second die having a forming surface having a concave curved surface.

A steel material is heated and punched while tension is applied to the steel material (2) in at least one direction along a surface of the steel material between first and second portions of the steel material distant from each other with forming unit posed therebetween. The tension is applied to increase a distance between the first and second portions of the steel material by a length corresponding to an amount by which the distance between the first and second portions of the steel material thermally expands as the steel material is heated to the temperature in the step of heating and punching. The forming unit includes a first die for punching the steel material and a second die facing the first die, the first die or the second die having a forming surface having a concave curved surface.

A binary nozzle for atomizing a mixture of agent to be sprayed and spray air is connected to at least one supply duct via which the mixture or the agent to be sprayed can be supplied to the binary nozzle, wherein a valve is arranged between this supply duct and a nozzle outlet of the binary nozzle. A corresponding spray head and also a method for atomizing a mixture of agent to be sprayed and spray air uses a binary nozzle. The binary nozzle includes a nozzle body formed in a single piece and including the nozzle outlet, wherein a movable assembly of the valve is fastened to the nozzle body by a fastening element and/or held tight against the nozzle body by a spring device.

A binary nozzle for atomizing a mixture of agent to be sprayed and spray air is connected to at least one supply duct via which the mixture or the agent to be sprayed can be supplied to the binary nozzle, wherein a valve is arranged between this supply duct and a nozzle outlet of the binary nozzle. A corresponding spray head and also a method for atomizing a mixture of agent to be sprayed and spray air uses a binary nozzle. The binary nozzle includes a nozzle body formed in a single piece and including the nozzle outlet, wherein a movable assembly of the valve is fastened to the nozzle body by a fastening element and/or held tight against the nozzle body by a spring device.

A multistage press for the bulk deformation of a piece of wire includes a wire feed with associated apparatus for cutting to length, and a transfer devicehaving grippersfor receiving a piece of wire that has been cut to length and transferring the latter to subsequent forming stages, there being arranged, on that side of the cutting-to-length apparatus opposite from the wire feed, a device for partially heating a length of wire. A method produces a formed part with a multistage press of this type.

The method includes: the step of preparing a steel material and a work portion; the step of placing the steel material on the work portion; and the steps of obtaining the rolling bearing ring by heating the steel material on the work portion to a temperature equal to or higher than an A.sub.1 transformation point, thereafter punching a part of the steel material into a ring shape, and thereafter quenching the steel material in a ring shape on the work portion. In the step of obtaining the rolling bearing ring, heating and punching are performed in the state where oxidation of the steel material is suppressed, and in the state where tensile force is applied between the first portion and the second portion in the steel material.

The method includes: the step of preparing a steel material and a work portion; the step of placing the steel material on the work portion; and the steps of obtaining the rolling bearing ring by heating the steel material on the work portion to a temperature equal to or higher than an A.sub.1 transformation point, thereafter punching a part of the steel material into a ring shape, and thereafter quenching the steel material in a ring shape on the work portion. In the step of obtaining the rolling bearing ring, heating and punching are performed in the state where oxidation of the steel material is suppressed, and in the state where tensile force is applied between the first portion and the second portion in the steel material.

Provided is a method for producing a hot forged material capable of preventing the generation of double-barreling shaped forging defects. A method for producing a hot forged material, wherein both an upper die and a lower die are made of Ni-based super heat-resistant alloy, and a material for hot forging is pressed by the lower die and the upper die in the air to form the hot forged material, the method comprising: a raw material heating step of heating the material for hot forging in a furnace to a heating temperature within a range of 1000 to 1150 C.; a jig heating step of heating a holding jig for holding the material for hot forging within a temperature range of 50 C. lower than and 100 C. higher than the heating temperature of the material for hot forging; a die heating step of heating the upper die and the lower die to a heating temperature within a range of 950 to 1100 C.; and a transferring step of transferring the material for hot forging onto the lower die by using the holding jig attached to a manipulator after the completion of the raw material heating step, the jig heating step, and the die heating step.

Provided is a method for producing a hot forged material capable of preventing the generation of double-barreling shaped forging defects. A method for producing a hot forged material, wherein both an upper die and a lower die are made of Ni-based super heat-resistant alloy, and a material for hot forging is pressed by the lower die and the upper die in the air to form the hot forged material, the method comprising: a raw material heating step of heating the material for hot forging in a furnace to a heating temperature within a range of 1000 to 1150 C.; a jig heating step of heating a holding jig for holding the material for hot forging within a temperature range of 50 C. lower than and 100 C. higher than the heating temperature of the material for hot forging; a die heating step of heating the upper die and the lower die to a heating temperature within a range of 950 to 1100 C.; and a transferring step of transferring the material for hot forging onto the lower die by using the holding jig attached to a manipulator after the completion of the raw material heating step, the jig heating step, and the die heating step.