Makino Milling Machine Company, Ltd

Yasuhiko Kikkawa

Masahiro Shirone

Masahiro Maeda

Naoya Sumita

Akihiro Mochizuki

Yasuo Sudo

Aritomo Sasaki

Haruyuki Shiraishi

Kunio Yamaguchi

Provided is a flexible machining facility using a sub-pallet, which can quickly satisfy the increasing or decreasing of units or other required specifications. It The machining facility includes a machine tool () having a pallet changer () for changing main pallets (), a plurality of sub-pallets () for a workpiece to be mounted thereon, a setup station () for carrying the sub-pallet () and mounting and dismounting a workpiece on and from the sub-pallet (), a sub-pallet stocker () for carrying the sub-pallet () thereon, and a sub-pallet conveyor system () for conveying the sub-pallet () and configured to include sub-pallet carrying parts of the machine tool (), setup station (), and sub-pallet stocker () in a workable area thereof. The sub-pallet () can be used to convey and machine a workpiece.

Machining facility using sub-pallet

The present invention provides a cartridge-type spindle device having an easily separable structure despite the fact that it comprises a rotary joint for a through spindle coolant device. In the cartridge replacement type spindle device (), front bearings of the spindle are built in a front housing () and rear bearings of the spindle () are supported on a rear housing () so that, when the front housing () is separated from the rear housing (), the front bearings (), the spindle (), and the rear bearings () can be separated from the rear housing () integrally with the front housing (). The rotary joint is disposed in a piston () of an unclamp means for unclamping a tool (, T) mounted to the forward end of the spindle (), so that a draw bar () accompanied by a seal ring can be separated from the rear housing () and the rotary joint together with the spindle () and the front housing ().

Spindle device of machine tool

A hollow portion of a spindle through which a draw bar and a disc spring assembly are inserted has a closed chamber structure and constitutes an oil pool chamber in which a lubricating oil is filled. The bearing portions that support the draw bar in the oil pool on both sides have the same inner diameter so that the volume of the oil pool chamber does not change when the draw bar is moved forward and backward. As a result, the lubricating oil is not pushed out of the oil pool chamber. Thus, a spindle unit can be provided in which a clamping device including the draw bar and the disc spring assembly for clamping a tool or a workpiece pallet at the forward end of the spindle can be reliably lubricated, so that the friction on and the breakage of the clamping device is reduced and that the service life of the unit is lengthened.

Spindle unit of machine tool

A spindle device of a machine tool such as a milling machine and a machining center and a method of replacing a spindle, the spindle device wherein the housing of a spindle head () is divided into a front housing () and a rear housing (), a spindle () is installed in the front housing () through front bearings (), and a built-in motor rotor (), a bearing case () through rear bearings (), and a draw bar () for clamping a tool are installed on and in the spindle () to form a front housing unit (); the method comprising the step of replacing the spindle () and the bearings by replacing the front housing unit (), whereby, when the spindle device comes out of order, the spindle and bearings can be easily replaced in a short time and the stop time of the machine tool can be minimized at a site where the machine tool is used.

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Yamanashi, Japan

Yasuhiko Kikkawa