WO1989009954A1 - Method and apparatus for generating spatial curve - Google Patents
Method and apparatus for generating spatial curve Download PDFInfo
- Publication number
- WO1989009954A1 WO1989009954A1 PCT/JP1989/000354 JP8900354W WO8909954A1 WO 1989009954 A1 WO1989009954 A1 WO 1989009954A1 JP 8900354 W JP8900354 W JP 8900354W WO 8909954 A1 WO8909954 A1 WO 8909954A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- dimensional point
- curve
- point sequence
- dimensional
- sequence
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000010586 diagram Methods 0.000 description 11
- 238000004364 calculation method Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 238000009795 derivation Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000015654 memory Effects 0.000 description 2
- 206010036790 Productive cough Diseases 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000003936 working memory Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/41—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by interpolation, e.g. the computation of intermediate points between programmed end points to define the path to be followed and the rate of travel along that path
Definitions
- the present invention relates to a method and apparatus for creating a space curve, and in particular, to a method for creating a three-dimensional space curve required for creating a free-form surface by smoothly connecting discretely given three-dimensional point sequences. And equipment.
- a curved surface on a design drawing of a three-dimensional mold or the like is generally represented by a plurality of cross-sectional curves, and there is no shape data between one cross-sectional curve and the next.
- FIG. 9 is an explanatory diagram of such a three-dimensional surface generation method, in which a three-dimensional curve (reference curve) 11a and lib of a surface cut by a predetermined cross section are given (FIG. 9 (a)). ) See) The reference curves lla and lib are each divided into N equal parts (see Fig. 9 (b)), and the corresponding division points are connected by straight lines to generate a curved surface CS (see Fig. 9 (c)).
- a reference curve that is a three-dimensional curve space curve
- a discrete three-dimensional point sequence Pli (xi, yi, zi) (i 1, 2
- a space curve (reference curve) is obtained by interpolating between points with a cubic polynomial curve so that the points are in close proximity.
- an object of the present invention is to provide a space curve generation method and apparatus capable of easily generating a space curve and shortening the processing time.
- a two-dimensional point sequence connecting curve that smoothly connects the projection point sequences on each plane is determined, and a space curve is created using these two two-dimensional point sequence connecting curves.
- FIG. 1 is a schematic explanatory view of the present invention
- FIG. 2 is a block diagram of an apparatus for realizing the present invention.
- FIG. 3 is a flowchart of the process of the present invention
- Fig. 4 is an explanatory diagram of a two-dimensional point sequence when a three-dimensional point sequence is projected onto two adjacent planes.
- Fig. 5 shows a two-dimensional point sequence connection curve connecting two-dimensional point sequences with spline curves.
- Figure S is an explanatory diagram of n division of the common axis
- Fig. 7 is an explanatory diagram of the space curve creation process
- Fig. 8 is a block diagram of the space curve generator that embodies the present invention.
- FIG. 9 is an explanatory diagram of a conventional example.
- FIG. 1 is a schematic diagram illustrating the general expectoration of the present invention.
- TQ is the spline interpolation between all two points on the first two-dimensional point sequence Q i.
- TR is the second two-dimensional point sequence tangent curve similarly obtained from the second two-dimensional point sequence R i, and the coordinates on the Y axis Value
- xj is the first two-dimensional point sequence corresponding to the coordinate value yj of the points on the tangent curve
- TQ X: axis coordinate value
- z 2 is the second two-dimensional point sequence corresponding to the coordinate value yj Connection curve
- the coordinate values (xj, yj) and (yd, zj) of the points Qj and Rj on the first and second two-dimensional point sequence connection curves TQ and TR are calculated sequentially, and the three-dimensional coordinate values are obtained.
- FIG. 2 is a block diagram of an automatic programming device for realizing the present invention.
- 101 is a 3D point sequence data, the number of divisions n, a keyboard for inputting data such as a common axis, etc.
- 102 is a processor
- 103 is a memory for storing a control program
- R ⁇ M 1
- Reference numeral 04 denotes RAM
- reference numeral 105 denotes working memory
- reference numeral 106 denotes a surface storage memo for storing the generated three-dimensional curve data, surface data, and NC program data for surface processing.
- Reference numeral 107 denotes an output device for outputting the generated surface data or NC program data for surface processing to an external storage medium 108 such as a paper tape or a magnetic tape, 109 an address bus, 110 Is the data.
- FIG. 3 is a flowchart of the process of the space curve generating method according to the present invention
- FIGS. 4 to 7 are explanatory diagrams of the present invention.
- the operator designates a shared axis (for example, the Y-axis) among the three-dimensional coordinate axes, inputs the number of divisions n for dividing the Y-axis, and starts the space curve generation processing by a predetermined method (Step 201). .
- the two-dimensional point sequence Qi (Xi, yi) and R (yi, zi) are obtained by projecting on the coordinate plane and the ⁇ — ⁇ coordinate plane), and the coordinate values of the two-dimensional point sequence Qi, Ri are obtained.
- RAM I 04 see FIG. 4, step 202).
- the processor 102 uses the coordinate values of the two-dimensional point sequences Q i and R i stored in the RAM 104 to smoothly smooth all two points on the two-dimensional point sequences Q i and R i. Calculate the connected two-dimensional point sequence connection curves (planar curves) TQ and TR.
- two-dimensional The point-sequence connection curves TQ and TR are generated using a well-known method, for example, the derivation formula of the curve segment of Ferguson (described in the prior art). That is,
- the processor 102 sets l ⁇ «j (step 205), and sets a point on the two-dimensional point sequence connection curve TQ s TR having the Y-axis coordinate of the j-th division point, and the coordinate value (xj, yj), (yd, zj) the calculated (step 2 0 6), point T j (X j y yj, curved storage memory 1 0 zd) as the j-th point on the space curve 6 (Refer to FIG. 7, step 207).
- the processor 102 judges whether j.> N (step 2108), and if j '> n is not satisfied,
- Step 209 The processing from Step 206 is repeated, and if ⁇ j> n, the space curve creation processing ends.
- the Ferguson curve segment is used.
- the two-dimensional point sequence connection curve was obtained using the derivation formula of .However, what kind of method can be used to obtain a planar curve that connects two points smoothly using a discretely given two-dimensional point sequence The method is fine.
- FIG. 8 is a block diagram of another space curve generating apparatus for realizing the method of the present invention, where 11 is a three-dimensional point sequence input section for inputting a three-dimensional point sequence, and 12 is a three-dimensional input sequence.
- the point sequence is projected onto two adjacent planes (for example,; XY,; ⁇ plane) of the rectangular coordinate system to generate a first two-dimensional point sequence Q i and a second two-dimensional point sequence R i.
- the three-dimensional point sequence generation unit 13 generates a first two-dimensional point sequence connection curve TQ that smoothly connects all two points on the first two-dimensional point sequence Q i with a spline curve
- 2 is a two-dimensional point sequence connection curve generator that generates a second two-dimensional point sequence connection curve TR that smoothly connects all two points on the two-dimensional point sequence R i with a spline curve.
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- Engineering & Computer Science (AREA)
- Computing Systems (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Numerical Control (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63086852A JPH01258106A (ja) | 1988-04-08 | 1988-04-08 | 空間曲線創成法 |
JP63/86852 | 1988-04-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1989009954A1 true WO1989009954A1 (en) | 1989-10-19 |
Family
ID=13898342
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1989/000354 WO1989009954A1 (en) | 1988-04-08 | 1989-04-04 | Method and apparatus for generating spatial curve |
Country Status (4)
Country | Link |
---|---|
US (1) | US5132913A (ja) |
EP (1) | EP0374254A4 (ja) |
JP (1) | JPH01258106A (ja) |
WO (1) | WO1989009954A1 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1232128B (it) * | 1989-07-05 | 1992-01-23 | Advanced Data Processing | Dispositivo elettronico di interpolazione polinomiale per controlli numerici di macchine utensili, particolarmente fresatrici per la lavorazione di stampi e macchina incorporante detto dispositivo |
US5363309A (en) * | 1993-02-25 | 1994-11-08 | International Business Machines Corp. | Normal distance construction for machining edges of solid models |
US6922606B1 (en) | 1999-11-19 | 2005-07-26 | Siemens Energy & Automation, Inc. | Apparatus and method for smooth cornering in a motion control system |
US8062333B2 (en) * | 2005-02-17 | 2011-11-22 | Anpa Medical, Inc. | Suture retainer with multiple circumferentially spaced attachment points and suture retention method |
JP4648471B2 (ja) | 2009-07-14 | 2011-03-09 | ファナック株式会社 | 工作機械の工具軌跡表示装置 |
CN111397514B (zh) * | 2020-04-27 | 2022-08-02 | 华北科技学院 | 一种倾角误差控制方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS635407A (ja) * | 1986-06-25 | 1988-01-11 | Okuma Mach Works Ltd | 数値制御装置における曲線補間方式 |
JPH0615710A (ja) * | 1992-06-30 | 1994-01-25 | Nissei Plastics Ind Co | 射出成形機のデータ出力方法及び装置 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3882304A (en) * | 1973-05-04 | 1975-05-06 | Allen Bradley Co | Parametric interpolation of three-dimensional surfaces |
US3860805A (en) * | 1973-05-07 | 1975-01-14 | Bendix Corp | Method and apparatus for producing a fairing contour in numerical control systems |
US3969615A (en) * | 1974-12-20 | 1976-07-13 | The United States Of America As Represented By The United States Energy Research And Development Administration | Interpolator for numerically controlled machine tools |
JPS59127109A (ja) * | 1983-01-07 | 1984-07-21 | Omron Tateisi Electronics Co | 産業用ロボツトの等速動作方法 |
JPH0664486B2 (ja) * | 1983-07-07 | 1994-08-22 | ファナック株式会社 | 3次元曲線作成方法 |
US4704688A (en) * | 1984-06-12 | 1987-11-03 | Mitsubishi Denki Kabushiki Kaisha | Interpolation method for numerical control machine |
JPS63155206A (ja) * | 1986-12-18 | 1988-06-28 | Fanuc Ltd | 数値制御方式 |
TW249854B (ja) * | 1992-05-21 | 1995-06-21 | Philips Electronics Nv |
-
1988
- 1988-04-08 JP JP63086852A patent/JPH01258106A/ja active Pending
-
1989
- 1989-04-04 WO PCT/JP1989/000354 patent/WO1989009954A1/ja not_active Application Discontinuation
- 1989-04-04 US US07/445,622 patent/US5132913A/en not_active Expired - Fee Related
- 1989-04-04 EP EP19890904208 patent/EP0374254A4/en not_active Ceased
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS635407A (ja) * | 1986-06-25 | 1988-01-11 | Okuma Mach Works Ltd | 数値制御装置における曲線補間方式 |
JPH0615710A (ja) * | 1992-06-30 | 1994-01-25 | Nissei Plastics Ind Co | 射出成形機のデータ出力方法及び装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP0374254A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP0374254A1 (en) | 1990-06-27 |
JPH01258106A (ja) | 1989-10-16 |
EP0374254A4 (en) | 1991-07-03 |
US5132913A (en) | 1992-07-21 |
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