A method for redistributing an area of residual stress around a machined central aperture in an engine component. The method includes changing tensile stress to compressive stress at an area circumscribing the machined aperture. The method can be applied to, for example, a forged engine component such as a rotating disk or an impeller part for a gas turbine engine.

A method for retrofitting a measuring facility on a tube of a fluid line of a vehicle, in particular a rail vehicle, includes using a non-cutting friction drilling process in the vehicle for creating a hole in the tube by melting the material of the tube. The measuring device is connected at the hole created by melting. A rail vehicle with a fluid line, for instance in a freight car, is also provided.

A device is provided with a first die, a second die and a pressing machine. The second die is provided with a plastic processing hole where a core metal is disposed on a hole center line. On the inner peripheral surface of the plastic processing hole, three projecting portions are provided at regular intervals in the circumferential direction of the hole center line. By the approach of the first and second dies to each other, the core metal is inserted into a guide hole of a contact tip, and the projecting portions plastically deform the head end side of the contact tip by pressing it until it is in contact with the core metal.

A device is provided with a first die, a second die and a pressing machine. The second die is provided with a plastic processing hole where a core metal is disposed on a hole center line. On the inner peripheral surface of the plastic processing hole, three projecting portions are provided at regular intervals in the circumferential direction of the hole center line. By the approach of the first and second dies to each other, the core metal is inserted into a guide hole of a contact tip, and the projecting portions plastically deform the head end side of the contact tip by pressing it until it is in contact with the core metal.

A method for manufacturing a heat exchanger includes softening a base material having a predetermined hardness, forming fins by cutting and raising a surface of a softened base material by skiving, and hardening the base material by performing a heat treatment on the base material with the fins formed thereon.

Electrically assisted flow drill screwdriving processes (EAFDS) and devices are described. The methods can augment traditional FDS and allow for softening of metals of a stack-up, which can enable FDS joining of thicker and stronger materials such as boron steel. EAFDS methods can reduce cycle time and can be used to join thicker cross-sections with reduced installation torque. Also disclosed are fixtures for attachment to existing devices that can provide for the electrical augmentation of existing FDS processes.

A springback-reduced part formed by performing a springback reduction on a press-formed part that is formed by a press forming of a blank sheet made of a metal sheet. The springback-reduced part is formed by setting each element of an analytic model of the press-formed part to a stressed state that causes a springback, performing an optimization analysis for shape to detect a portion of the press-formed part that highly contributes to the rigidity thereof, applying a rigidity improving means on a specific portion of the press-formed part on the basis of the detected portion, and performing the press forming.

A springback-reduced part formed by performing a springback reduction on a press-formed part that is formed by a press forming of a blank sheet made of a metal sheet. The springback-reduced part is formed by setting each element of an analytic model of the press-formed part to a stressed state that causes a springback, performing an optimization analysis for shape to detect a portion of the press-formed part that highly contributes to the rigidity thereof, applying a rigidity improving means on a specific portion of the press-formed part on the basis of the detected portion, and performing the press forming.

The invention relates to a method and to an apparatus for setting a screw, in particular a flow drilling screw. In accordance with the method, the screw is driven at a first revolution speed and at a first axial feed force during a time-limited first phase to drive the screw through at least one component. In the event that the screw does not penetrate the component during the first phase, the screw is automatically driven at a second revolution speed that is higher than a first rotation speed and/or at a second axial feed force that is greater than a first axial feed force during a second phase subsequent to the first phase.

The invention relates to a separation unit for a feed apparatus for joining elements, in particular screws, in particular flow-drilling screws, comprising a joining element receiver for receiving a joining element having a head and a shaft, a slider displaceable relative to the joining element receiver, and a rotational element about which the joining element received in the joining element receiver is rotatable on a displacement of the slider.