Nagoya University

Okuma Corporation

Tokai National Higher Education and Research System

Mitsubishi Heavy Industries Limited

Mitsubishi Heavy Industries Aero Engines, Ltd.

Denso Corporation

Mitsubishi Materials Corporation

Murata Machinery, Ltd.

Nagoya Institute of Technology

National University Corporation Tokai National Higher Education and Research System

Denso Daishin Corporation

Ntk Cutting Tools Co., Ltd.

Eiji Shamoto

Norikazu Suzuki

Takehiro Hayasaka

Kiyoshi Yoshino

Akihide Hamaguchi

Kohei Nishimura

Hongjin Chung

Soohyun Nam

Hiroshi Ueno

Yu Hasegawa

Jun Eto

Yoichi Ishikawa

Nobukazu Horiike

Hiroshi Inagaki

Fumihiro Itoigawa

Shigeki Ueno

Hajimu Ishii

Tomio Koide

Akira Kitano

Shiro Nagami

Keigo Matsunaga

Yukio Naiki

Koji Mizutani

Shota Yoshino

Tomomi Sugihara

Shunsuke Fujimaki

Seiji Hamada

Takashi Ueda

Kota Aoyama

A rotation mechanism rotates a spindle to which a cutting tool or a workpiece is attached. A rotation controller controls the rotation of the spindle by the rotation mechanism. A feed mechanism moves the cutting tool relative to the workpiece. The rotation controller alternately exercises acceleration control under which the rotation of the spindle is accelerated to make a speed fluctuation ratio between the current cutting speed and a cutting speed one rotation before at the same rotation position equal to or greater than the first value that is greater than 1 and deceleration control under which the rotation of the spindle is decelerated to make the speed fluctuation ratio equal to or less than the second value that is less than 1.

Machining apparatus and cutting method

A low toughness workpiece cutting apparatus, a low toughness workpiece manufacturing method and a low toughness workpiece manufacturing program for predicting an occurrence of defect and/or non-occurrence of defect before a cutting process of low toughness material. A defect prediction device is provided with a storage device, a processor and an interface. The storage device stores tool data that represent physical characteristics and a shape of a tool, cutting data that represent a group of parameters of a cutting process to be performed to a workpiece by use of the tool and material data that represent physical characteristics and a shape of the workpiece. The processor performs an analysis of deformation of the workpiece due to a cutting force and an analysis of fracture due to the deformation, and performs a prediction of an occurrence of defect and/or a non-occurrence of defect of the workpiece due to the cutting process.

Low toughness workpiece cutting apparatus, low toughness workpiece manufacturing method and recording medium storing low toughness workpiece manufacturing program

A structure for cooling a rake face of a cutting insert in a region near a tip of a cutting edge. The cutting insert includes a rake face, a cutting edge formed on an outer periphery of the rake face, a base portion that supports the rake face, and an internal cooling path through which fluid for cooling the rake face flows. The internal cooling path includes an introduction flow path and a cooling flow path, and the cooling flow path is disposed behind a region in which a chip of a workpiece comes into contact with rake face. The cooling flow path is provided at a depth of less than or equal to 1.5 mm from the rake face.

Cutting insert and cutting tool

A radius endmill suppressing chatter vibration includes a circular arc edge provided on an outer peripheral side of a distal end portion of a tool body, and a nose (R) angle (θr) that is an angular range in which the circular arc edge is formed in a vertical section including a central axis line of the tool body and which is equal to or less than 30°. The circular arc edge is formed, as a circular arc edge for a bottom surface, from a position having a tangential line in a direction that perpendicularly intersects the central axis line to a side surface in a bottom surface of the distal end portion of the tool body in a vertical section. A nose (R) height (Hr) that is a dimension of the circular arc edge in the direction of the central axis line is equal to or less than 0.75 mm.

Radius endmill and machine tool using the same, and designing method and machining method of radius endmill

Provided is a cutting method of cutting, with a diamond cutting tool, a metal material having at least a solid solution layer on a surface, the solid solution layer containing nitrogen atoms as interstitial solid solution atoms. In this method, cutting is performed in a region where a nitrogen concentration is equal to or greater than a predetermined concentration, and cutting is not performed in a region where the nitrogen concentration is less than the predetermined concentration.

Cutting method using diamond cutting tool

A rotation controller controls a rotation mechanism for rotation of a spindle. A movement controller causes, while the spindle is rotating, a feed mechanism to bring a cutting tool into contact with a workpiece to cause the cutting tool to cut the workpiece. The rotation controller controls a spindle rotation speed so as to accelerate or decelerate the rotation of the spindle, and the movement controller brings the cutting tool into contact with the workpiece after the rotation controller starts the rotation of the spindle, and separates the cutting tool from the workpiece while the spindle rotation speed is put under the acceleration control or deceleration control exercised by the rotation controller.

Processing device and cut-processing method

A controller uses detection information of a contact sensor or time-series data of a detection value related to a drive motor included in a rotation mechanism and/or a feed mechanism to acquire a coordinate value when a cutting tool comes into contact with a to-be-cut object or a component. The controller determines a relative positional relationship between the cutting tool and a rotation center of the to-be-cut object based on coordinate values when the cutting tool comes into contact with the to-be-cut object subjected to turning work or a reference surface whose relative positional relationship with the rotation center of the to-be-cut object is known at least at two positions different from a rotation angle position of the cutting tool during the turning work.

Cutting apparatus and contact position specifying program

A controller performs a first process of scanning a cylindrical irradiation region including a focused spot of laser light emitted from a laser light emitter to machine a flank face side of a workpiece to manufacture a cutting tool having a plurality of cutting edges arranged in line. In the first process, the controller scans the cylindrical irradiation region along a scanning path that has periodicity and changes a machining depth to form the plurality of cutting edges. The controller further performs a second process of scanning the cylindrical irradiation region including the focused spot of the laser light emitted in a direction different from an irradiation direction of the laser light in the first process to machine a rake face side of the workpiece.

Method of manufacturing cutting tool

An end mill machining apparatus, a CAM apparatus, an NC program, and a machining method which suppress regenerative self-excited vibration and mode-coupling self-excited vibration. An end mill machining apparatus includes an end mill, and a control section for controlling the end mill. The ratio of the protrusion length of the end mill to the diameter of the end mill falls within a range of 5 to 50. The end mill is a variable pitch, uniform helix type or a variable helix type. The control section controls the end mill such that the contact angle between the end mill and a workpiece Mduring machining becomes equal to or smaller than a critical contact angle &#x3b8;.

End mill machining apparatus, CAM apparatus, NC program, and machining method

A virtual plane obtained by a locus when a tangent line, which passes through a tool distal end edge, of a virtual circle formed when a tool distal end edge of a cutting edge is rotated in a tool circumferential direction is moved parallel to a tool axial line is a reference plane, an angle (ARt) at which a cross line of the reference plane and the cutting edge virtual plane, is inclined with respect to the tool axial line projected onto the reference plane, is in a range of &#x2212;30 degrees to &#x2212;60 degrees, an angle (RR) at which a cutting edge tangent line which passes through the tool distal end edge and extends outward in a tool radial direction, is inclined with respect to a predetermined tool radial direction, which passes through the tool distal end edge, is in a range of &#x2212;30 degrees to &#x2212;75 degrees.

Rotating-cutting-edge-type milling tool and cutting method using same

An end milling apparatus has an end mill and a support member. The end mill has a cutting portion and a non-cutting portion. The support member supports the non-cutting portion in at least one direction toward the periphery of the end mill. The width of the support member as measured in the direction orthogonal to the direction of the center axis of the end mill and to the direction in which the support member is located as viewed from the end mill is smaller than the outer diameter of the end mill.

End milling apparatus, CAM apparatus, and NC program

A tool path generation device that calculates a tool path to be used by a machine tool device, and that provides a high machining efficiency with suppressed occurrence of chatter vibration by calculating machining conditions in consideration of a chatter vibration increase and decrease affecting value that affects increase and decrease in chatter vibration.

Tool path generation device, tool path calculation method, and tool path generation program

A machine tool includes a number-of-same-rotation-speed-cutting-passes computing section that decides the number of same rotation speed cutting passes. The number-of-same-rotation-speed-cutting-passes computing section determines the cutting mode of a threading process based on a set machining program etc., and automatically decides an optimal number of same rotation speed cutting passes according to the cutting mode. Thus, even unskilled operators can easily suppress chatter vibrations, and can easily use the machine tool.

Machine tool for a threading process

In a machine tool which includes a rotary shaft configured to allow a tool or a workpiece to be attached thereto, a driving unit for causing the rotary shaft to rotate is regulated to change a rotation speed of the rotary shaft in such a manner that the rotation speed oscillates with a given amplitude and a given period with respect to a given mean rotation speed, so that chatter vibrations can be suppressed. A parameter display control unit configured to cause a display device to display parameter information related to predetermined parameters for changing at least one of the mean rotation speed, the amplitude and the period is provided so that the parameters can be changed based upon the parameter information displayed in the display device.

Machine tool

A vibration suppressing method and a vibration suppressing device are disclosed. After a tool is attached to a main spindle, a modal parameter of the tool or a workpiece is computed. Thereafter, a relation between chatter frequency and phase difference is calculated as an approximation formula based on the obtained modal parameter and machining conditions. If chatter vibration occurs after initiation of the machining, a chatter frequency corresponding to a target phase difference is obtained using the approximation formula, and based on the obtained chatter frequency, the number of tool flutes and the main spindle rotation speed, the optimum rotation speed is calculated. The rotation speed of the main spindle is then changed in accordance with the obtained optimum rotation speed.

Growing community of inventors

Nagoya, Japan

Eiji Shamoto