Hitachi, Ltd.

Fumio Yoshinaga

Akira Murayama

Toshiaki Koyama

Yasushi Izunaga

Sigeaki Kuroda

Shintaro Sado

Tadashi Fukuishi

Shouji Kikuchi

Toshio Hirai

Tadao Ochiai

A machining device comprising five axial kinetic coordinate systems that can be controlled simultaneously, three axes of which, are linear moving axes and two axes of which are rotary axes, with one axis of the five axes being provided with a tool rotating function, whereby said machining device is equipped with a cutting tooland a friction stir welding tool. The current value observed when a large-diameter portion of said toolcontacts the work object is set in advance, and by observing the torque current of the rotary shaft of the toolduring friction stir welding, the insertion depth of the toolcan be controlled by maintaining the observed torque current above the preset current value, thus providing a good weld. A single device can provide both the cutting and the welding. Thus, it is possible to reduce equipment cost, installation space, plant area, lead time and production cost.

Friction stir welding device with detector for detecting torque current of friction stir welding tool

A machining device comprising five axial kinetic coordinate systems that can be controlled simultaneously, three axes of which are linear moving axes and two axes of which are rotary axes, with one axis of the five axes being provided with a tool rotating function, whereby said machining device is equipped with a cutting tool and a friction stir welding tool . The current value observed when a large-diameter portion of said tool contacts the work object is set in advance, and by observing the torque current of the rotary shaft of the tool during friction stir welding, the insertion depth of the tool can be controlled by maintaining the observed torque current above the preset current value, thus providing a good weld. A single device can provide both the cutting and the welding. Thus, it is possible to reduce equipment cost, installation space, plant area, lead time and production cost.

Compound machining device and friction stir bonding method

Friction stir welding method

A machining device comprising five axial kinetic coordinate systems that can be controlled simultaneously, three axes of which are linear moving axes and two axes of which are rotary axes, with one axis of the five axes being provided with a tool rotating function, whereby said machining device is equipped with a cutting tool and a friction stir welding tool The current value observed when a large-diameter portion of said tool contacts the work object is set in advance, and by observing the torque current of the rotary shaft of the tool during friction stir welding, the insertion depth of the tool can be controlled by maintaining the observed torque current above the preset current value, thus providing a good weld. A single device can provide both the cutting and the welding. Thus, it is possible to reduce equipment cost, installation space, plant area, lead time and production cost.

Compound machining device

A scroll type compressor having a pair of scroll type compression units which are encased in the same casing so as to make a common use of a lubricating oil reservoir provided in the casing, wherein the compression units have compression elements, drive shafts, driving motors and other components which are of the same constructions and specifications, and wherein each of the compression units are adapted to be driven selectively by commercial electrical power or through a frequency-variable inverter so as to operate at different speeds. Since both compression units can be made up from the same components such as the compression elements, loads in the production, service and administration, are greatly reduced contributing to a reduction in the labor and cost, while eliminating any mounting error. Various operation patterns are obtainable by selecting the combination of the direct commercial power and the power supplied through the inverters, so as to provide delicate control of refrigeration capacity over a wide range in accordance with the level of the load demand. Common use of the lubricating oil reservoir by both compression units eliminates necessity for specific measure for preserving oil levels equally for both compression units.

Scroll type compressor and refrigeration cycle using the same

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Kudamatsu, Japan

Fumio Yoshinaga