Nsk Corporation

Etsuo Koike

Hiroaki Fujishiro

Shingo Matsuo

Hironori Okado

Hitoshi Sannomiya

A laser welding apparatus () includes a laser welding head () configured to irradiate a workpiece () with laser light, a welding filler feeding mechanism () configured to supply a welding material to a position on which laser welding is performed, and a hollow structural moving mechanism () configured to move a welding unit () including the laser welding head and the welding filler feeding mechanism. The hollow structural moving mechanism has an insertion portion () through which an optical cable () of the laser welding head and a wire material () of the welding filler feeding mechanism are inserted.

Laser machining method

A laser welding apparatus () includes a laser welding head () configured to irradiate a workpiece () with laser light, a welding filler feeding mechanism () configured to supply a welding material to a position on which laser welding is performed, and a hollow structural moving mechanism () configured to move a welding unit () including the laser welding head and the welding filler feeding mechanism. The hollow structural moving mechanism has an insertion portion () through which wire materials (and) of the laser welding head and the welding filler feeding mechanism are inserted.

A rolling die for a ball screw has: a cylindrical portion including a helical protrusion formed in an outer peripheral surface thereof for forming a helical ball groove in a raw material of a screw shaft of the ball screw; and a conical lead-in portion formed in one end portion of the cylindrical portion, the lead-in portion including a plurality of frustum-cone-shaped portions, wherein the contact angles of the frustum-cone-shaped portions with respect to the raw material of the screw shaft are each set so as to increase sequentially in the order starting at and from the frustum-cone-shaped portion adjoining the cylindrical portion.

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Fujisawa, Japan

Etsuo Koike