Hitachi, Ltd.

Hitachi Metals, Ltd.

Hitachi-johnson Controls Air Conditioning, Inc.

Koji Utsumi

Hideaki Onozuka

Masayuki Kyoi

Shinji Kayama

Shigeyoshi Fujihara

Masahiro Watanabe

Kenichi Inoue

Hisashi Aoki

Yoshiyuki Yamada

Tadashi Kitamura

Toshio Yamanaka

Eiji Sakamoto

Ippei Kono

Tomu Kato

Kohei Kaiho

Hidetaro Kayanuma

Yusuke Omuro

The present invention provides a technology for generating an NC program which can secure appropriate machining accuracy. Provided is a conversion computerwhich includes a CPUand generates an NC program for a turning process for a workpiece on a lathe, wherein the CPUis configured to generate an NC program such that displacements caused for a workpiece to be processed on a plurality of machining positions at a time of a turning process are calculated, on the basis of the displacements caused for the workpiece on the plurality of machining positions, a movement path of a tool to be used at the time of the turning process is decided, and the tool is moved through the decided movement path.

NC program generation system and NC program generation method

A screw rotor lead correction calculation device includes an initial data input section configured to input an error as a distance with respect to a reference lead at each axial position of a rotor groove portion of a screw rotor, and a processing machine input correction amount/position output section configured to compute and output, based on the error as the distance input to the initial data input section, a lead correction amount with respect to the reference lead and a lead correction starting position as an axial position for starting lead correction. With this configuration, correction data for obtaining a screw rotor with a high-accuracy lead can be obtained from a lead error with respect to a reference lead in a screw rotor obtained by ground finish of the material of the screw rotor.

Screw rotor processing method and screw rotor lead correction calculation device

A measurement system includes a measuring instrument, a measurement control device, and a ranging device. The measuring instrument includes a base that is to be fixed to a tool shaft of a machining apparatus, a first rod and a second rod that are connected to the base, and a first measuring head and a second measuring head that are fixed to the respective rods and irradiate an object to be measured with measurement light. The measurement control device acquires a distance I between the first measuring head and an inner peripheral surface of the hole of the object to be measured, and a distance O between the second measuring head and an outer peripheral surface of the object from the ranging device, and calculates the thickness of the object on the basis of the distance I, the distance O, and a distance between the first and second measuring heads.

Measurement system and method of manufacturing shaft with hole

A machining condition estimating apparatus, and method, for estimating a machining condition to suppress a wear volume of a tool when conducting cutting work in a work machine are provided. For example, an analysis model presenting shapes of a tool and cutting material, may be defined, to be a target of analysis, and an initial value for use of analysis and change volume of the machining condition parameter as analysis parameters may be set up. Coordinates for tool and cutting material contact may be calculated. Moreover, a boundary movement rate, a maximum contact length, and a contact angle are calculated. A machining condition presented by the analysis parameter may also be searched and outputted.

Machining condition estimating apparatus and machining condition estimating method

The table on which a workpiece is put can travel on a guide rail mechanism relative to a working head with a cutting tool mounted thereon. The table is connected through a nut to a ball screw part to move in an axial direction thereof as the ball screw part rotates. One end of the ball screw part is supported by a bearing and the other end is connected to a servomotor to be rotationally driven. A hollow part is provided in the table to receive therein a damper mechanism part, which comprises a spring, a damper, and a weight, the table and the weight being arranged to enable traveling separately on guide rails. Thereby, even when the workpiece is heavy, the weight can move relative to the table to effectively damp vibrations of the table in a feed direction.

Machine tool

Using parameters such as diameters of a rough cutter and a finishing cutter, a position of a tool at cutting work completion in a rough work, a finishing cutting area, specifications of a rotating tool (the number of cutting edges, a cutting force eigenvalue, a compliance transfer function), etc., a cutting force acting on a cutting edge of the rotating tool is found, and results thereof are made use of to analyze a characteristic equation being a loop transfer function of a vibration system composed of the rotating tool and a work, whereby it is possible to predict presence of generation of self-excited vibration of the finishing cutter performed after a rough work in a shoulder cutting work. Thereby, the rotating tool operates stably in a finishing work and besides shoulder cutting of a work can be performed in a high work efficiency.

Method of calculating coordinates at cutting work completion in shoulder cutting by means of rotating tool

A method for calculating depth of cut without any milling self-excited vibration. An initial value for machining-surface-perpendicular depth of cut is set. A cutting start angle and cutting end angle for a cutting edge is obtained, based on the initial value. A machining-surface-perpendicular depth of cut that causes no self-excited vibration is calculated. The maximum depth of cut that corresponds to the stability limit of a milling self-excited vibration is calculated, by repeating the calculation while modifying the initial value until the difference between the initial value and the calculation result becomes the same as, or smaller than, a given value. As a result, the stability-limit depth of cut is preliminarily analyzed to the milling self-excited vibration in consideration of a pick feed, the gradient angle of a workpiece, and a machining-surface curvature radius, so that man-hours required for creation and modification of NC data can be reduced.

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Tokyo, Japan

Koji Utsumi