Makino Milling Machine Company, Ltd

Kobe University

Mitsunari Oda

Akira Kawana

Norio Mori

Ryuta Sato

Nobu Nakayama

Takumi Nakanishi

Yuki Sato

Masashi Tanuma

Takashi Komori

Takahiro Yoshimura

Megumi Furuta

Akihiro Shinone

Toshimune Kawai

A parameter indicating a surface property of an object surface is plotted on the horizontal axis, a normal direction change rate of the shape of the object surface is plotted on the vertical axis, the minimum normal direction change rate visible to a person is associated with the parameter indicating the surface property of the object surface to create a visible area map, the relationship between the parameter indicating the surface property of a machining surface of a workpiece, and the maximum value of the normal direction change rate of the shape of the machining surface of the workpiece is displayed on the visible area map, and the object surface is evaluated.

Object surface evaluation method, evaluation device, workpiece machining method using said evaluation method, and machine tool

In the present invention: a plurality of meshes are defined on an object surface; the luminance of the object surface when the object surface is viewed from a viewpoint position is calculated for each of the plurality of meshes on the basis of data concerning a processed shape, a surface roughness curve, the viewpoint position, the direction, angle distribution, and intensity of incident light onto the object surface, and a reflectance and scattering characteristics for each wavelength on the object surface; the shape of the object surface is displayed on the basis of the luminances; and data concerning at least the object shape or the surface roughness curve is corrected so as to obtain a desired appearance of the object surface.

Object-surface correcting method, and processing method and processing system for workpiece

A shape evaluation method includes a shape error calculation step that calculates a shape error, which is an error between a designed shape and a shape to be evaluated, and a visible error detection step that detects visible shape errors on the basis of the shape error and predetermined visual characteristic data.

Shape evaluation method and shape evaluation apparatus

A numerically controlled machine tool in which a numerical control program acquired from a reading and interpreting unit of a numerical control device is executed by a distribution interpolating unit and servo control units, to drive a feed shaft configured from a coarse movement mechanism and a fine movement mechanism, causing a tool to move relative to a workpiece, and thereby machining the workpiece, wherein the difference between a movement command for the feed shaft, and an output value which varies on the basis of said movement command is obtained, a movement command for the coarse movement mechanism is generated on the basis of said movement command, and a movement command for the fine movement mechanism is generated on the basis of said difference.

Feed shaft control method and numerically controlled machine tool

Provided is a feed shaft control method, wherein a speed feedback loop having a speed controller is disposed within a position feedback loop having a position controller, forming a cascade coupling, and an acceleration feedback signal which is outputted from a compensator on the basis of an output signal of an acceleration detector is subtracted from a torque instruction. Furthermore, the method implements control wherein a speed is acquired on the basis of the output signal of the acceleration detector, and a signal obtained by multiplying the acquired speed by a gain is added to a speed instruction which is outputted from the position controller.

Feed shaft control method and numerical control work device

A tool path generation method for generating a second tool path by performing a smoothing process on a first tool path for processing a work with a machine tool includes a change rate calculation step of calculating a curvature change rate of the first tool path at a plurality of moving points (P) of the first tool path. The tool path generation method includes: a weight calculation step of calculating a moving average weight on the basis of the curvature change rate of the first tool path at each of the moving points (P); and a step of calculating coordinate values of the moving average of the moving points (P) using the weight at each of the moving points (P), and setting the coordinate values of the moving average of the moving points (P) as moving points of the second tool path.

Tool path generation method and machine tool using rate of change of curvature based smoothing

A worked surface of a workpiece is evaluated on the basis of how the surface is actually perceived by a person's (observer's) eyes (vision) or fingers (touch), and a work process whereby a workpiece is worked is changed on the basis of the evaluation.

Method of evaluating a machined surface of a workpiece, a controlling apparatus and a machine tool

A tool path is generated with procedures that include: one of the processing points (Pi) on a multiple rows of tool paths (PA) obtained by connecting multiple prescribed processing points sequentially with straight lines is set as a revision processing point (Pt), points on the multiple rows of tool paths are set as distance calculation points (Pu), and the distance (L) from the revision processing point (Pt) to each of the distance calculation points (Pu) is calculated; the distance calculation points (Pu') for which the distance (L) is within a prescribed value (&#x394;L) are extracted; the mean values of the position data for the distance calculation points (Pu&#x2032;) and the position data for the revision processing point (Pt) are calculated; and the position data is revised by means of the mean values, and a new tool path (PA&#x2032;) is created.

Generation method and generation apparatus of tool path based on corrections using average distances

A working machine feed axis control device: disposes a velocity feedback loop and forms a cascade coupling on the inner side of a location feedback loop; comprises a velocity gain setting apparatus () which multiplies the output of the velocity feedback look by a first gain (kv), and a location gain setting apparatus () which multiplies the output of the location feedback loop by a second gain (kp); subtracts the output of the velocity gain setting apparatus () and the output of the location gain setting apparatus () from a torque instruction (&#x3c4;); and outputs the remaining torque instruction (&#x3c4;) to a subject to be controlled ().

Working machine feed axis control method and feed axis control device

A stick motion correction method which corrects stick motion which occurs at time of reversal of a feed axis of a numerical control machine tool stores a position command to be commanded to a servo motor from an NC program of a numerical control machine tool for each predetermined control period from a current position command to a later position command, calculates a reversal correction command based on the stored position commands, calculates an advancement time for advancing timing of addition of the reversal correction command to a speed or torque command of the motor from reversal timing of the servo motor, based on information obtained from operation of the motor and adds the reversal correction command to the speed or torque command of the servo motor to precisely correct stick motion at a timing advanced from the reversal timing of the servo motor by an exact time.

Correction method at time of feed axis reversal

A numerical control device which controls a feed axis of a machine tool has a storage unit which divides a range of movement of the feed axis into a plurality of regions and stores a plurality of control parameters corresponding to the divided plurality of regions in advance, a position detection unit which detects a position of a feed axis at the time of machining a workpiece, a parameter selection unit which reads out control parameters corresponding to a divided region to which the detected feed axis position at the time of machining a workpiece belongs, and a servo control unit which controls the feed axis using the read control parameters. Due to this, it is possible to provide a numerical control method of a machine tool which realizes stable machining precision without regard as to the feed axis position and a numerical control device which conducts that method.

Numerical control method and numerical control device of machine tool

In this numerical control method that drives the feed shaft of a machine tool () by means of a servo control unit (), a transmission function is determined by modeling the operation of the servo control unit () of the feed shaft, the closed loop transmission function (G) of the position loop and/or the closed loop transmission function of the velocity loop of the servo control unit () of the machine tool is measured using the frequency response of the feed shaft, the control subject (P) of the position loop and/or the control subject of the velocity loop is determined using the measured closed loop transmission function, the position loop modeling error (&#x394;P) and/or the velocity loop modeling error is determined from the control subject, and at least one control parameter of the servo control unit () is calculated using the closed loop transmission function and/or the modeling error. As a result, the optimum plurality of control parameters corresponding to the state of the feed shaft is determined easily and automatically.

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