Kawasaki Jukogyo Kabushiki Kaisha

Mamoru Nishio

Tetsuya Kubota

Shigekazu Shikoda

Hirotaka Uehara

Osamu Satoh

Tomoyuki Uno

Takehiro Nishimura

Takayuki Murata

Yousuke Tsumura

Daisuke Watanabe

Hideyuki Hirasawa

Hironori Okauchi

Shunichi Nakao

Tomohei Kobayashi

Eiichi Yagi

Yoshimitsu Kurosaki

Mitsuhiro Kamioka

An ultrasonic flaw detector for a composite material constituted by a plurality of materials which are different in physical properties from one another includes: a section specifier configured to specify first and second sections of an RF signal of a reflected wave of an ultrasonic wave with which the composite material is irradiated, a material reflected wave being possibly generated in the first section, an interface reflected wave being possibly generated in the second section; a material flaw determiner configured to determine whether or not a value of the RF signal exceeds a positive first threshold in the first section; and an interface flaw determiner configured to determine whether or not the value of the RF signal falls below a negative second threshold in the second section.

Ultrasonic flaw detector and ultrasonic flaw detecting method for composite material

A method of producing plate springs for a railcar bogie, the plate springs each extending in a car longitudinal direction and elastically supporting a cross beam while being supported by an axle box in the railcar bogie, the axle box accommodating a bearing for an axle, the method includes: a molding step of molding a mother plate made of fiber-reinforced resin, the mother plate including a layer made of continuous fibers oriented in a first direction when viewed from a normal direction of a main surface of the mother plate; a cut position determining step of determining positions of a plurality of parallel cut lines for cutting the mother plate along the first direction; and a cutting step of cutting the mother plate along the plurality of cut lines to take out the plate springs made of the fiber-reinforced resin.

Method of producing plate spring for railcar bogie

This invention provides a method for inspecting a joined region and joining strength of a joined object formed by a spot friction stir joining process. In this method, an ultrasonic wave is introduced into the joined object from a backing faceopposed to a joining tool plunging faceand the ultrasonic wave reflected from the joined objectis taken in. In this case, the joining regionand the joining strength is estimated by observing a reflected wave of the ultrasonic wave in the vicinity of a position, along a reference direction Z, corresponding to an interfaceof two joining members, without using the reflected wave of the ultrasonic wave reflected from the joining tool plunging face, thereby inspecting the joined object based on the estimation result. Thus, influence of a concave/convex shape of a joining markformed in the joining tool plunging facecan be avoided, and the use of the ultrasonic wave for estimating the joined regioncan achieve an inspection of joining quality without destroying the joined object

Method and apparatus for inspecting joined object formed by friction stir joining

A laser beam projector to be employed in an automatic welding machine, such as a robot, includes an optical head that projects a laser beam and a holding and turning mechanism that holds and turns the optical head. The spot of the laser beam can be accurately located on the portion to be welded by turning the optical head by the holding and turning mechanism.

Laser beam projector

A weld portion detector ( ) and a laser beam projector ( ) disposed a predetermined distance behind the weld portion detector ( ) are moved together. The weld portion detector ( ) detects a weld line and the laser beam projector ( ) projects on the weld line detected by the weld portion detector ( ) for laser welding. Pieces of data on weld positions sequentially detected by the weld portion detector ( ) are stored sequentially in combination with times when the pieces of data on the weld positions are obtained and moving speeds of the weld portion detector ( ) in a memory. A time when the weld portion detector ( ) passed a point at which the laser beam projector ( ) has just arrived is calculated on the basis of the times and the moving speeds stored in the memory. The laser beam projector ( ) projects a laser beam on a weld position detected at the thus calculated time.

Laser welding method and laser welding apparatus

A laser-welding head is capable of applying a fixed pressure to parts to be welded of workpieces regardless of the undulation of the surfaces of the parts to be welded. The laser-welding head includes a pressing device ( ) having a roller ( ) which rolls along parts of workpieces near a weld line ( ) to press together the same parts of the workpieces, a pressing unit ( ) for applying a predetermined pressure to the pressing device ( ) to press the pressing device ( ) toward the parts of the workpieces near the weld line ( ), and a laser beam projecting unit ( ) mounted on the pressing unit ( ) for movement together with the pressing device ( ). The pressing unit ( ) is provided with a pneumatic cylinder actuator for applying the predetermined pressure to the pressing device ( ).

Laser welding head with associated roller

Growing community of inventors

Kobe, Japan

Mamoru Nishio