Hitachi, Ltd.

Hitachi Software Engineering Company, Ltd.

Other

Hiroshi Arai

Osamu Chiba

Nobuhisa Kanamaru

Junichi Hirai

Tamotsu Harihara

Masaaki Takahashi

Ichiro Harashima

Norihiro Nakajima

Takeo Yamada

Shigeru Arai

Tomotoshi Ishida

Shunsuke Minami

Yasumasa Kawashima

Shinji Tokumasu

Yoshiaki Shinotsuka

Misato Nio

Motomi Odamura

Yoshimi Ota

When creating other tool path from two tool paths for cutting a work accurately and efficiently, the data on the first tool path is composed of a position vector and a direction vector of a tool for use when the work is cut while moving the tool. The data on the second tool path is composed of a position vector and a direction vector of the tool for use when the work, which has been cut according to the first tool path, is further cut. A computer uses the first tool path data and second tool path data to calculate a position vector and a direction vector of a medium tool path that is between the first tool path and second tool path.

Apparatus and method for creating tool path

A numerically controlled curved-surface machining unit equipped with three linearly moving axes and, at least, one rotary axis, including a simultaneous multiple-axis control NC machine numerically controlled by a numerical control unit with a numerical control NURBS interpolation function. The unit enables reading, as CL (cutter location) data, tool control point vector data and tool axis vector data, along a machining direction on a workpiece coordinate system for a curved surface, obtaining feed rates therefor, and calculation by conversion of the CL data into position vectors of three linear axes on a machine coordinate system, rotation angles and feed rates on the machine coordinate system so as to operate the simultaneous multiple-axis control NC machine on the basis of a machine configuration of the simultaneous multiple-axis control NC machine. The unit forms at least one NURBS curve having continuous curvature, calculates data therefor and converts the NURBS curve into NC data for NURBS interpolation.

Numerically controlled curved surface machining unit

A numerically controlled curved-surface machining unit comprises a component converting matrix&#xb7;angle-addition value forming function of converting CL (cutter location) data into components on a normal coordinate system on the basis of the machine configuration of the simultaneous multiple-axis control NC machine, a component converting function of converting from the workpiece coordinate system to the normal coordinate system, a function of forming second angles of a second rotary axis on the normal coordinate system, a compensating function of forming a continuous angle distribution from a distribution of the second angles, a function of forming first angles of a first rotary axis on a coordinate system rotated by the second angles at the second rotary axis, a compensating function of forming a continuous angle distribution from a distribution of the first angles, a machine coordinate transformation matrix forming function of obtaining a matrix for converting the tool control point vectors on the workpiece coordinate system into a machine coordinate system by using the first angles and the second angles, and a machine coordinate converting function of converting the tool control point vectors into the machine coordinate system by using the machine coordinate transforming matrix.

An NC data service business is created, by making use of a numerical control (NC) data service provider company PC provided with associated devices necessary for NC data preparation such as a CAD system, a CAM system, a dedicated NC post processor, an NC machining simulator and an NC machining unit. An NC data service provider company transmits a home page relating to the data service via a communication line, through a dialog with an NC data service user company via the home page, provides data service relating to the NC data requested by the user company and receives payment of the consideration for the service.

Method of providing data for numerical control machining unit

Performing NURBS (non-uniform rational B-spline) interpolation machining is performed by reading cutter location (CL) data consisting of a tool control point vector and a tool axis vector on a workpiece coordinate system, converting the CL data into a position vector of three linear axes and a rotation angle on a machine coordinate system in accordance with the machine configuration of a simultaneous multiple-axis NC machine, calculating knot vectors of a NURBS curve with the most suitable chord length on the basis of a position vector of the three linear axes and a rotation angle, calculating a NURBS curve of the three linear axes and one rotary axis using the knot vectors, converting the NURBS curve into NURBS interpolation NC data, converting the feed rate on a workpiece coordinate system into the feed rate per minute on a machine coordinate system, and transmitting NC data to a NC machine.

A method and device for pattern processing whereby accurate and effective processing can be carried out as a user desires. A pattern processing device of this invention comprises an information input/output device, an information processing device, and a data storage device; wherein the information processing device comprises pattern processing means, significance describing means, characteristic information input means, characteristic information extraction means, characteristic information describing means, and pattern processing means making reference to characteristic information. Intentions of a user or characteristics of pattern elements or sets of pattern elements are described and added to the pattern data so that this characteristic information can be referred to when pattern data processing is carried out. Thus, it is possible to make accurate representation of pattern data in a computer, and it is also possible to generate or convert patterns as the user desires.

Method and apparatus for pattern data processing

In order to generate a display of a surface, an equation or equations are generated corresponding to all or parts of the surface. The equation or equations represent the surface as a physical membrane. Boundary conditions of the surface can thus be specified, and the equation solved using the boundary conditions as outer constraints to generate a display of the surface. A set of points within the boundary of the surface may be specified, which then define inner constraints for the solution of the equation. Where parts of the surface join at a point or line, a further equation can be generated, which further equation represents the area around the join as a physical membrane. Solution of that equation, preserving the boundary of the area around the join, provides a smooth transition between the parts of the surface.

Method and apparatus for generating a surface by simulating a physical

The present invention is to output the geometric form characteristic, such as the principal curvature of a geometric model constituted in a computer to meet an image of a user to easily modify the form. In order to achieve the foregoing object, there is suggested an apparatus for displaying a geometric form characteristic that includes a form display device for displaying, on a display device such as a CRT, a geometric model input in the computer, a position instruction device for indicating, on the display screen, an arbitrary point on the displayed form by using a pointing device such as a mouse, a geometric form characteristic calculating device for calculating the geometric form characteristic at the arbitrarily indicated point, and a geometric form characteristic display device for displaying the calculated geometric form characteristic in the form of a graph. According to the present invention, a form that meets the image of a user, such as a concave, convex and the plane portion can be displayed as the user directly touches the form using a mouse.

Method and apparatus for displaying altitude of form characteristics

A drawing information processing method and system adapted to offer a plurality of types of standard display results for each object to-be-displayed through instructions. Data for specifying the form of the object to-be-displayed, and display method data for stipulating a display method showing how the object to-be-displayed is displayed, are stored so as to correspond to each other. The display method data includes data for designating, for example, a display direction, display range, and display position or the like. A plurality of sets of display method data are stored. For displaying, one data which represents a desired status may be selected from a plurality of displaying method data to display the object to-be-displayed in the selected form based on the selected data.

Displaying method and system for displaying an object by designating a

A three-dimensional shape as a synthesis of three-dimensional geometry entities is controlled and displayed. The geometry entities are controlled in accordance with information defining the geometry entities, and layout information arranged in a three-dimensional space. An interface between graphic display apparatus using this graphic display method and an application system is practiced in that the transfer of the information on the geometry entities is carried out. The three-dimensional shape is divided into its geometry entities, and the display of an object having a three-dimensional shape is done as a synthesis of the geometry entities, the transfer of shape data being done separately for each geometry entity.

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Hitachiota, Japan

Hiroshi Arai