Toshiba Kikai Kabushiki Kaisha

Kouichi Katoh

Takamasa Itoh

Jun Fujita

Makoto Sagara

Atsushi Tada

Ichiro Matsumoto

Masami Aihara

Tsuyoshi Fujita

Norihiro Miyazawa

Makoto Sawazaki

Hirofumi Shinohara

Masaru Usui

Yoshiaki Mikami

Katsuhito Endo

Takazumi Watanabe

Yasunori Kato

Yoshiaki Kai

Nobuyuki Endo

Yutaka Asanome

Takamasa Ito

A tool holder of a machine tool, in which the machine tool includes a spindle head and a spindle supported by the spindle head, includes: a shank portion attached to the spindle; a rotary portion integrally provided to the shank portion and to which a welding tool (processing tool) used for friction stir welding is attachable; a bearing mechanism (bearing) supporting the rotary portion so that the rotary portion is rotatable; and a bearing holder holding the bearing mechanism, in which the bearing holder is disposed facing the spindle head and is capable of transmitting a load applied to the bearing mechanism to the spindle head.

Tool holder and machine tool

A friction stir welding tool attachable to a spindle of a machine tool includes: a shank connected to the spindle; a chuck connected to the shank through a heat insulating portion; a welding tool connected to the chuck and usable for friction stir welding; and a cooling jacket provided on a circumferential surface of the chuck. The cooling jacket is provided with a refrigerant path for delivering a refrigerant.

Friction stir welding tool

A method of placing a bottom block includes: placing bottom blocks on a block storage area in which a spindle can hold the bottom blocks; attaching a block-transferring tool to the spindle, the block-transferring tool having a main shaft attachment attached to the spindle and a block holder for holding the bottom block; and holding the bottom blocks by the block holder of the block-transferring tool and placing the held bottom blocks on a predetermined workpiece placing position on an upper surface of a table by relative movement.

Bottom block, a block-transferring tool and a machine tool provided with the block-transferring tool

A machining method of a press die having a pierce cutter and a secondary relief-clearance area recessed inward relative to a profile of the pierce cutter. A plunge cutting tool has an edge portion protruding from an outer circumference of a tool body and can carve while rotating and moving in an axial direction of the tool body. While rotating the plunge cutting tool with an axis of the tool body being approximately parallel to a surface of the pierce cutter, the plunge cutting tool is relatively moved along the profile of the pierce cutter. The plunge cutting tool is also relatively moved in the axial direction of the tool body along the shape of the pierce cutter and the secondary relief-clearance area in a piercing direction each time the plunge cutting tool is relatively moved by a predetermined pitch.

Machining method, program, machining-program generating program and machining apparatus of press die

A method for machining a slide core hole in a mold and a measurement/correction system for use in machining of a slide core hole. A spindle head is pivoted to meet the inclination angle of the slide core hole to be machined in the mold. A shallow flat-bottomed spot-faced hole is spot-faced in the surface of the mold. A guide hole is drilled in the bottom surface of the spot-faced hole. A rod hole is drilled using the guide hole as a guide. An intermediate pocket hole is formed while expanding the spot-faced hole. A reference point is corrected based on measurement of the shape of the intermediate pocket. A corrected machining program is executed with the corrected reference point to carry out precision shaping machining of the core pocket while expanding the intermediate pocket.

Method for machining slide core hole

A machining method of a press die having a pierce cutter and a secondary relief-clearance area recessed inward relative to a profile of the pierce cutter is provided. A plunge cutting tool having a tool body and at least one edge portion provided on an outer circumference of an end of the tool body is used, the edge portion being protruding from the outer circumference of the tool body and being capable of carving while rotating around an axis of the tool body and moving in an axial direction of the tool body. While rotating the plunge cutting tool with an axis of the tool body being approximately parallel to a surface of the pierce cutter, the plunge cutting tool is relatively moved along the profile of the pierce cutter. The plunge cutting tool is also relatively moved in the axial direction of the tool body along the shape of the pierce cutter and the secondary relief-clearance area in a piercing direction each time the plunge cutting tool is relatively moved by a predetermined pitch.

A position ensuring system includes an A-axis calibration system which measures a displacement angle, which is an error between a target value and a measured value of the pivot angle of the spindle head about the A-axis, and corrects the pivot angle about the A-axis in such a manner that the displacement angle as measured with the corrected pivot angle as a target value fall within a tolerable range. A corrected data storage device stores the corrected pivot angle about the A-axis. An A-axis control system reads out the corrected pivot angle about the A-axis, the corrected pivot angle about the A-axis to pivot the spindle head when executing oblique machining of the inclined hole.

Position ensuring system for oblique machining in five-axis machine tool

A measurement/correction system for use in machining an inclined slide core hole includes means for executing a measurement program which, after machining of an intermediate pocket hole in a mold surface, measures the position of the center of a rod hole in a seating surface of the intermediate pocket and the position of the seating surface of the intermediate pocket. Arithmetic means calculates the coordinates of an actual reference point of the rod hole from the measurements. Correction means compares the measured position of the reference point with the reference point previously set in a machining program, and, if there is an error, rewrites the coordinates of the reference point in the program to the measured coordinates. The corrected machining program is executed with the rewritten reference point in order to carry out machining of the core pocket while expanding the intermediate pocket.

Method for machining slide core hole and measurement/correction system for use in machining of slide core hole

There is provided a method for machining a deep hole, which enables prevention of scattering of a coolant and efficient discharge of shavings. The deep hole machining method includes: feeding a spindle to a deep hole machining start position while jetting a coolant toward a workpiece from an external normal pressure coolant supply line; closing the external normal pressure coolant supply line and opening a spindle normal pressure coolant supply line at the start of machining of a deep hole, and machining the deep hole to a predetermined intermediate depth while supplying a coolant to a machining point; and closing the spindle normal pressure coolant supply line and opening a high-pressure coolant supply line when the depth of the hole machined has reached the intermediate depth, and machining the deep hole to the final depth while supplying a high-pressure coolant to a machining point.

Method and apparatus for machining deep hole

A tool holder has a cutter arbor. The cutter arbor has a shank portion detachably mounted on a spindle, and a mechanism for holding a cutting tool. In the cutter arbor portion, a cavity portion is formed. In the cavity portion, a vibration damping material is filled at a filling rate so as to be capable of obtaining predetermined vibration damping characteristics. Thus, it is possible to provide high vibration damping characteristics, effectively damp vibrations during cutting and improve working precision, without using any special materials, such as damping materials, although the tool holder has a usual shape.

Tool holder

A numerical controlling unit includes: an inputting part into which a machining program is inputted; an analyzing part that analyzes the machining program to generate an instructed spindle rotational speed and calculates a spindle load ratio of a load applied to a spindle under a machining condition according to the machining program to a spindle load caused when the workpiece is machined: and a distributing part that generates, based on the machining program, a distribution amount per unit period inputted into a feed-axis servo driver. A spindle-rotational-amount-command outputting part receives the instructed spindle rotational speed and outputs a spindle-rotational-amount command for commanding a rotational amount per unit period which is inputted into a spindle driver. A cutting-load-for-judgment calculating part calculates a reference torque value based on the spindle load ratio, the distribution amount, and the spindle-rotational-amount command. A spindle-load comparing part compares the reference torque value with a load torque value which is feedback inputted by the spindle driver and outputs a tool-breakage detecting signal when the load torque value is higher than the reference torque value.

Numerical controlling unit having tool-breakage detecting function

A longer life, low cost tool and tool holder enabling change of posture with respect to a spindle, having a high machining accuracy of a workpiece, and resistant to generation of vibration or heat, provided with a working tool for processing a workpiece, a motor having an output shaft to which the working tool is connected and rotating the working tool, a first holder for holding the working tool and the motor, a mount attached to the spindle, a generator to which rotational force is transmitted from the spindle through the mount and generating electric power for driving the motor, a second holder for holding the mount rotatably, holding the generator, and engaged with a nonrotating portion of the machine tool, and a posture adjustment mechanism which connects the first holder and the second holder and is able to change the posture of the working tool with respect to the spindle.

Machine tool, tool, and tool holder

A cutting tool for a machine tool is provided in order to cut an inside corner of a workpiece. The cutting tool has at least one cutting edge formed on its bottom. In operation, the cutting tool is rotated by the machine tool. Further, both cutting tool and workpiece move relatively to each other in accordance with the rotating angle of the cutting tool so that the cutting tool has its outer end describing a moving track in agreement with the contour of an inside corner of the workpiece. The cutting tool further moves along the direction of a rotating axis of the cutting tool in rotation.

Method and tool for cutting inside corner

The numerical controlling unit includes an inputting part for inputting an inputting program. The inputting program includes a NC program defining a relative feed speed and a relative rotational number between a tool and a work, and also includes additional machining information. The inputting part is connected to an analyzing part, which is adapted to recognize the NC program and the additional machining information respectively from the inputting program inputted by the inputting part. The analyzing part is connected to a distributing part, which is adapted to make distributing information for the tool based on the NC program recognized by the analyzing part. The analyzing part and the distributing part are connected to a fusing part, which is adapted to fuse the distributing information and the additional machining information into controlling information for the tool. According to the numerical controlling unit, a more accurate numerical control can be achieved.

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Numazu, Japan

Kouichi Katoh