Mitsubishi Electric Corporation

Nippon Steel Corporation

Kyohei Ishikawa

Masaki Seguchi

Kenta Fujii

Motoaki Nishiwaki

Hiroshi Kikuchi

Tatsuya Yamamoto

Nobuaki Tanaka

Tomohiro Kyoto

Masato Kawasaki

Teruaki Fukuoka

Naoyuki Nakamura

Hideyuki Masui

A high strength steel sheet including a sheet thickness center part and a surface layer soft part formed at one side or both sides of the sheet thickness center part, wherein the sheet thickness center part has a predetermined chemical composition and has a microstructure comprising tempered martensite: 85% or more, the surface layer soft part has a thickness of more than 10 μm to 5.0% or less of the sheet thickness, a microstructure comprising ferrite: 80% or more, and an internal oxide layer having a thickness of 3 μm or more from the surface, an average Vickers hardness (Hc) of the sheet thickness center part and an average Vickers hardness (Hs) of the surface layer soft part satisfy Hs/Hc≤0.50, and a void area ratio in a region from the surface down to a 10 μm depth position is 3.0% or less.

High strength steel sheet

A laser beam machine includes: a laser oscillator that outputs laser light; a transmission fiber through which the laser light output from the laser oscillator propagates; a first adjuster that is disposed between the laser oscillator and an incidence end of the transmission fiber and changes an incidence numerical aperture of the laser light incident to the incidence end of the transmission fiber; a second adjuster that converges the laser light and changes a zoom magnification of the laser light between an emission end of the transmission fiber and a workpiece; and a controller that performs adjustment of a beam diameter of the laser light at an image forming position of the laser light and adjustment of an emission numerical aperture of the laser light emitted from the emission end of the transmission fiber independently of each other, by changing the incidence numerical aperture.

Laser beam machine and method for controlling laser beam machine

A laser processing apparatus includes a laser oscillator; a processing head; a driver that controls a relative positional relationship between a workpiece and the processing head; control circuitry that controls the laser oscillator and the driver in order for the laser beam to scan a processing path on the workpiece; detection circuitry that observes a state of the workpiece being processed and outputs a result of observation as a time series signal; processed state observation circuitry that obtains evaluation information including a determination result that indicates whether a processed state of the workpiece is satisfactory or defective by evaluating the processed state of the workpiece on the basis of the time series signal for each of a plurality of sections obtained by dividing the processing path; and estimation circuitry that estimates a cause of a defect on the basis of the evaluation information of two or more of the sections.

Laser processing apparatus

A machining condition search device according to the disclosure includes a machining condition generation unit, a practical machining command unit, a machining evaluation unit, a prediction unit, an optimum machining condition calculation unit. The machining condition generation unit generates a machining condition defined by one or more control parameters settable on a machining apparatus. The practical machining command unit causes the machining apparatus to perform machining based on a generated machining condition. The machining evaluation unit generates an evaluation value of performed machining, on the basis of information indicating a machining result of the performed machining. The prediction unit predicts an evaluation value corresponding to a machining condition under which machining is not performed, on the basis of the evaluation value and the machining condition corresponding to the evaluation value. The optimum machining condition calculation unit obtains an optimum machining condition on the basis of a prediction value predicted by the prediction unit and an evaluation value generated by the machining evaluation unit. The optimum machining condition is a machining condition under which an evaluation value is equal to or greater than a threshold and a tolerance is maximum.

Machining condition search device and machining condition search method

A machining failure detection device includes a machining light measurement unit that measures machining light generated at a machining point during machining; a machining sound measurement unit that measures machining sound generated at the machining point; and a computation unit that determines whether a machining failure has occurred in the machining. The computation unit includes a feature extraction unit, a determination value calculation unit, and a determination unit. The feature extraction unit extracts a machining light feature from a machining light signal measured by the machining light measurement unit, and extracts a machining sound feature from a machining sound signal measured by the machining sound measurement unit. The determination value calculation unit calculates a combined failure determination value on the basis of the machining light feature and the machining sound feature. The determination unit compares the combined failure determination value with a determination criterion to determine a failure.

Machining failure detection device, laser cutting apparatus, and electric discharge machining apparatus

A laser machining apparatus includes: a laser oscillator to emit a laser beam; a focusing lens to irradiate a workpiece with the laser beam; a focus position control mechanism disposed between the laser oscillator and the focusing lens and disposed on the optical path of the laser beam and that controls the divergence angle of the laser beam and the incident diameter of the laser beam incident on the focusing lens; a laser beam deflector to deflect the laser beam before the laser beam is incident on the focusing lens; and an emitting angle control mechanism to control the emitting angle of the laser beam that exits from the focusing lens after being deflected by the laser beam deflector.

Laser machining apparatus and laser machining method

Provided is an abrasion-resistant steel including a predetermined chemical composition, in which content (mass %) of Mo and B satisfy Mo&#xd7;B&#x3e;0.0010, a mass fraction of MoFeBis from 0.0010 to 0.10%, an area ratio of martensite in a central portion in a thickness direction is 70% or more, Ceq obtained by the following (Formula 1) is 0.80% or less, and a plate thickness exceeds 50 mm;=C+Mn/6+(Cu+Ni)/15+(Cr+Mo+V)/5&#x2003;&#x2003;(Formula 1)

Growing community of inventors

Tokyo, Japan

Kyohei Ishikawa