JP4585533B2 - Propeller NC data creation device and creation method - Google Patents

Description

  The present invention relates to an apparatus and method for creating NC machining data for machining a propeller.

  When developing a propeller for a ship, a model propeller is first created and a performance test is performed before the actual propeller is manufactured. The propeller has a complex free-form surface. Therefore, a 5-axis control machining center having a high degree of machining freedom is used for machining the model propeller.

In Patent Document 1, drawing of the accuracy required to build an actual ship from the concept design of the hull shape, that is, fairing of the hull shape, and creating a highly accurate surface model using this fairing result A hull shape data creation device for doing this is disclosed.
Japanese Patent No. 3377732

There is a need for a technique for creating NC data for propeller machining used for control of a 5-axis control machining center.
Furthermore, a high level of skill is required to create NC data for such advanced work. Model propeller production technology has a small market, making it difficult for engineers to pass on the technology. Therefore, there is a demand for a technology that provides an environment in which an engineer who is not highly skilled can easily design an excellent model propeller.
SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus and method for supporting creation of NC data suitable for propeller machining, particularly NC machining of a model propeller.

  In the following, means for solving the problem will be described using the numbers used in [Best Mode for Carrying Out the Invention] in parentheses. These numbers are added to clarify the correspondence between the description of [Claims] and [Best Mode for Carrying Out the Invention]. However, these numbers should not be used to interpret the technical scope of the invention described in [Claims].

  The propeller NC machining data creation device (6) according to the present invention inputs propeller data (4) indicating the profile of the wing (64) of the propeller (65), and expresses a mathematical expression expressing the profile based on the propeller data (4). A blade surface point data creation unit (30) for creating a blade surface point group data (36) that is a point cloud data indicating the coordinates of each point on the surface of the blade based on the mathematical formula (30) 34), a blade surface angle data creation unit (38) for creating blade surface angle data (40) indicating angles at each point on the surface of the blade based on the mathematical formula, blade surface point group data (36), and blade surface An NC machining data creation unit (58) that creates NC machining data (60) input to the NC machine to NC machine the blade based on the angle data (40).

  According to the above invention, in order to improve the machining accuracy of the propeller blade surface, it is possible to calculate the optimum blade surface point group data and blade surface angle data while taking into account the degree of curvature, which is suitable for NC processing of the propeller blade surface. Suitable NC data can be created.

  The propeller NC machining data creation device (6) according to the present invention further includes a surface modeler (44) for creating a surface model (48) of the boss (66) to which the wing (64) is attached, and a boss based on the surface model of the boss. A boss point cloud data creation unit (50) for creating boss point cloud data (52) which is point cloud data indicating the coordinates of each point of the boss, and an angle at each point on the boss surface based on the boss surface model. A boss angle data creation unit (54) for creating boss angle data (56). Based on the boss point group data (52) and the boss angle data (56), the NC machining data creation unit (58) receives data (62) input to the NC machine to perform NC machining on the boss (66). Is added to the NC machining data (62).

  According to the above invention, regarding the boss portion having a high degree of freedom in shape and not suitable for mathematical expression, it is possible to improve the efficiency of the boss design by adopting a highly versatile surface modeler and consider the relationship with the blade surface. It is possible to calculate the optimal blade surface point cloud data and blade surface angle data while inserting, and it is possible to create NC data suitable for NC machining of bosses.

  In the propeller NC machining data creation device (6) according to the present invention, the surface modeler (44) creates a wing surface model (46) based on the wing surface point group data (36) to create a boss surface model (48). Display with

  According to the above invention, the propeller blade and the boss can be expressed as a surface model, and the shape can be confirmed by computer graphics.

  In the propeller NC machining data creation device (6) according to the present invention, the surface modeler (44) creates a surface model (48) of the fillet (68) provided at the base of the wing (64). The propeller NC machining data creation device (6) further creates fillet point cloud data for creating fillet point cloud data (52) which is point cloud data indicating the coordinates of each point of the fillet based on the fillet surface model (48). And a fillet angle data creation unit (54) for creating fillet angle data (56) indicating an angle at each point on the surface of the fillet based on the surface model (48) of the fillet. The NC machining data creation unit (58) is a data (62) input to the NC machine for NC machining the fillet (68) based on the fillet point group data (52) and the fillet angle data (56). Is added to the NC machining data.

  According to the above invention, the fillet shape that depends on the shape of the propeller blade surface and the boss adopts a versatile surface modeler that is excellent in fillet generation, so that the efficiency of the fillet design can be improved, and the blade surface and the boss. It is possible to calculate the optimal blade surface point cloud data and blade surface angle data while taking into account the surface contact, and it is possible to create NC data suitable for fillet NC processing.

  In the propeller NC machining data creation device (6) according to the present invention, the propeller data (4) is a three-sided view showing the shape of the wing.

  According to the above invention, propeller data as numerical information or paper information can be reproduced on a graphic screen of a personal computer and can be stored as digital information in a recording medium.

  The propeller NC machining data creation method according to the present invention includes a step of creating propeller data (4) indicating a profile of a wing (64) of a propeller (65), and formula (32) expressing the profile based on the propeller data. A step of creating blade surface point group data (36), which is point cloud data indicating the coordinates of each point on the surface of the wing based on the mathematical formula, and an angle at each point on the surface of the wing based on the mathematical formula NC machining data input to the NC machine for NC machining of the blade (64) based on the blade surface angle data (40) shown, the blade surface point cloud data, and the blade surface angle data. 60).

  According to the said invention, various data required for NC processing data preparation of a propeller blade surface can be easily acquired now by taking the prepared step.

  The propeller NC machining data creation method according to the present invention further includes the step of creating a surface model (48) of the boss (66) to which the wing (64) is attached, and the boss surface model (48), A step of creating boss point cloud data (52), which is point cloud data indicating coordinates, and boss angle data (56) indicating angles at respective points on the boss surface based on the boss surface model (48). And a step of creating data (62) input to the NC processing machine for NC processing of the boss based on the boss point group data and boss angle data and adding the data to the NC processing data.

  The propeller NC machining data creation method according to the present invention further includes a step of creating a surface model (48) provided at the joint between the wing (64) and the boss (66), and a fillet surface model (48) based on the fillet surface model (48). A step of creating fillet point cloud data (52), which is point cloud data indicating the coordinates of each point, and fillet angle data (56) indicating the angle at each point on the surface of the fillet based on the fillet surface model (48) And generating data (62) input to the NC processing machine for NC processing of the fillet based on the fillet point cloud data and the fillet angle data, and adding the data to the NC processing data. .

  According to the above invention, various data necessary for creating NC machining data for bosses and fillets can be easily obtained by taking the prepared steps.

  The propeller NC machining data creation method according to the present invention further includes a step of checking tool interference in the NC machining data (60, 62), and a step of correcting a mathematical expression expressing the profile according to the check result. .

  According to the said invention, an alarm can be displayed on an interference part, for example using the interference check result of a tool. While watching these alarms, it is possible to set a tool vector that does not cause interference, so it is possible to create NC machining data for a propeller easily and with high accuracy.

According to the present invention, an apparatus and a method for supporting creation of NC data suitable for propeller machining, particularly NC machining of a model propeller are provided.
Further, in the past, a high level of skill has been required for creating NC data for NC machining utilizing a 5-axis control machining center, but by taking various data creation steps provided as the method of the present invention. Even a person who has little experience and no skill can provide a system for creating highly accurate 5-axis control NC data.
According to the present invention, the NC processing rate of a model propeller, which has been highly dependent on manual work by skilled technicians, is improved, and effects such as making the model propeller amateur, improving workability, and greatly reducing production time occur.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of a propeller NC machining data creation device. The propeller shape data system 2 is a device for creating propeller data indicating a propeller concept design, and is realized by a computer and software for creating propeller shape data. The propeller shape data system 2 draws a propeller concept design on a display in response to an input operation of the operator, and creates propeller data 4 that can be read by a computer.

  The propeller NC machining data creation device 6 can be realized by a computer such as a personal computer. The propeller NC machining data creation device 6 includes an input device 8 used for inputting the propeller data 4. The propeller NC machining data creation device 6 includes a propeller formula display device 10, a general-purpose surface modeler device 12, and an NC data creation device 14. These devices generate output data including NC machining data while exchanging data with the data creation device 16, the display device 18, the arithmetic device 20, and the data creation device 2. The generated output data 28 is output by the output device 24. The NC processing data included in the output data 28 is input to the NC processing machine, and the NC processing machine performs NC processing using the data.

FIG. 2 shows an example of the propeller data 4. FIG. 2A is a side view showing the shape, blade thickness, and pitch angle of the FACE surface, BACK surface, and rake line of the propeller. FIG. 2B is a front view showing the blade profile of the propeller, the blade leading edge, the blade trailing edge, the BACK surface, the FACE surface, and the skew shape. FIG. 2 (c) is a cross-sectional view, the shape of the FACE surface and BACK _surface, Y u, _{Y L} is shown. The propeller data 4 is data indicating the concept or profile of such a propeller.

  FIG. 3 shows the configuration of the propeller mathematical formula display device 10. The propeller formula display device 10 includes a blade formula data creation unit 30, a blade surface point group data creation unit 34, and a blade surface normal data creation unit 38. The blade formula data creation unit 30 generates the blade formula data 32 based on the propeller data 4 and the formula data 31 input from the data creation device 16.

  Wing formula data 32 represents the concept design shown in the propeller data 4 by a formula. The propeller data 4 is data that designates only points such as contour, skew, rake, etc., and the propeller data 4 alone does not specify the three-dimensional shape of the blade surface. Therefore, the mathematical expression expressing the propeller data 4 has a degree of freedom. The operator refers to the input propeller data 4 to determine what formulas and parameters are to be applied to the propeller data 4, and the wing formula data 32, which is information necessary for specifying the formulas and parameters, is used as the data creation device 16. Enter from. Based on the wing formula data 32, the wing formula data creation unit 30 generates wing formula data 32 that is a mathematical expression of the wing shape conforming to the concept design of the propeller data 4. The display device 18 displays the wing formula data 32 and an image drawn based on the formula.

  The blade surface point group data creation unit 34 calculates the offset coordinate values (shown in three dimensions of x, y, z) of each point on the blade surface based on the blade numerical formula data 32, and calculates the shape of the blade surface. The blade surface point group data 36 that is the point group data to be expressed is output. The wing surface normal data creation unit 38 calculates a normal vector (i, j, k) at each point (x, y, z) on the wing surface based on the wing formula data 32 to obtain a wing surface normal. Output as data 40.

  FIG. 4 shows the configuration of the general-purpose surface modeler device 12. The general-purpose surface modeler apparatus 12 includes a surface modeler 44, a boss / fillet point cloud data creation unit 50, a boss / fillet normal data creation unit 54, and a CL data creation unit 58.

  The surface modeler 44 receives blade surface point group data 36 and creates a blade surface model 46 indicating the shape of the blade surface based on the data. The display device 18 displays the wing surface model 46.

  The operator inputs boss / fillet shape data 42, which is data for designating the boss and fillet shapes of the propeller, from the data creation device 16 to the general-purpose surface modeler device 12. The surface modeler 44 generates a boss / fillet surface model 48 that is a surface model of the boss / fillet based on the boss / fillet shape data. The display device 18 displays the boss / fillet surface model 48 and the blade surface model 46 in an overlapping manner.

  FIG. 6 shows an example of a surface model displayed on the display device 18. It includes a wing 64, a boss 66 disposed at the center of rotation of the wing 64, and a fillet 68 disposed at the root of the wing 64.

  Based on the boss / fillet surface model 48, the boss / fillet point group data creation unit 50 generates boss / fillet point group data 52, which is point group data indicating the coordinate values of each point forming the surface of the boss and the fillet. To do. Based on the boss / fillet surface model 48, the boss / fillet normal data creation unit 54 generates boss / fillet normal data 56 indicating the surface normal vectors at each point forming the surface of the boss and the fillet.

The CL data creating unit 58 receives the blade surface point group data 36 and the blade surface normal data 40, and generates blade CL data 60, which is NC machining data included in the output data 28, based on them. The blade CL data 60 indicates the cutting location (tool position and orientation) of the NC processing machine.
The CL data creation unit 58 inputs the boss / fillet point cloud data 52 and the boss / fillet normal data 56, and based on them, the boss / fillet CL data 62, which is NC machining data included in the output data 28, is obtained. Output. The boss / fillet CL data 62 also indicates the cutting location (tool position and orientation) of the NC processing machine.

  As shown in FIGS. 3 and 4, the procedure for creating NC machining data for blade surfaces is different from the procedure for creating NC machining data for bosses and fillets. The reason for this will be described.

  In order to perform NC machining on the blade surface of the propeller, the path (position and posture) of the cutting tool is determined based on the coordinate value of the point on the blade surface and the direction of the normal vector with a very fine mesh. There is a need. The propeller data 4 indicating only the concept cannot instruct the NC machine to operate.

  If point cloud data is generated for a blade surface based on propeller data, and a surface model is created therefrom, the coordinate value and normal vector data on the blade surface can be generated. However, such data has characteristics that are undesirable as NC machining data for blade surfaces. That is, the wing surface is a complex free surface, and when such a surface is described by a surface model, the smooth curved surface of the wing surface is not reflected when viewed in detail. For example, when a surface model is created by pasting together small triangular surfaces connecting points of point cloud data, the overall shape can be roughly reproduced, but the normal direction changes discontinuously along the wing surface. It becomes impossible to define the angle of the cutting tool for NC processing based on the normal of the blade surface. In addition to these cases, the data based on the point cloud data and the surface model may be a wavy wing surface as seen minutely. Even in such a case, it is impossible to define a cutter path and generate data suitable for NC machining.

  According to the present embodiment, the blade surface data creation unit 30 expresses the shape of the blade surface as a mathematical equation. Therefore, it is possible to specify smoothly the position and normal of the point which forms a blade surface with a fine mesh continuously along a blade surface. Since the blade surface point group data 36 and the blade surface normal data 40 are created based on the blade mathematical formula data, the above-described problems such as discontinuity and undulation can be avoided. As a result, blade surface data suitable for designating the cutter path of the NC processing machine can be obtained.

  On the other hand, since bosses and fillets can be defined not by free-form surfaces but by geometric surfaces, it is possible to create boss / fillet CL data 62 suitable for NC machining using surface shape data created by a surface modeler. Is possible.

  By such processing, an NC machining data creation apparatus suitable for machining a propeller-specific shape including a wing surface that is a complex free-form surface and bosses and fillets that can be expressed by a geometric curved surface is realized.

  FIG. 5 is a flowchart showing a propeller NC machining data creation method using the propeller NC machining data creation device 6. The propeller data 4 is input to the propeller formula display device 10 by a data input operation (step S1).

  The operator uses the propeller formula display device 10 to draw the wing surface expressed by the formula on the display screen to confirm the shape, and if necessary, converts the formula applied to the given propeller data 4 to a different formula. The blade surface file (including blade surface point group data 36 and blade surface normal data 40) is created (step S2).

  The operator uses the general-purpose surface modeler device 12 to create a blade surface model 46 from the blade surface file and displays it on the display device 18. The operator creates the boss to which the blade surface is attached and the shape of the fillet at the base of the blade by the surface modeler 44 (step S3).

  Blade surface point group data 36, blade surface normal data 40, boss / fillet point group data 50, and boss / fillet normal data 56 are input to the CL data creation unit 58. The operator operates the CL data creation unit 58 from the NC data creation device 14 to create NC data such as a tool vector (a tool path of the NC processing machine and an angle at each position) (step S4).

  When the cutter path by the NC machine is determined in step S4, the data is input to the general-purpose surface modeler 12. The operator uses the surface modeler to check whether the tool does not interfere with the blade to be cut or an adjacent blade (step S5). If interference occurs, the operator returns to step S4, adjusts the tool vector and tool size, and performs an interference avoidance operation.

  If interference avoidance is not possible even after repeated interference avoiding operations, the operator returns to step S2 to correct the blade formula data 32 to be applied to the propeller data 4. As a result, while satisfying the concept design of the propeller data 4, a propeller (wing formula data) having a slightly different shape can be obtained. Using this new blade formula data 32, the interference check is executed again.

  Data that is OK in the interference check is input to the NC data creation device 14. The NC data creation device 14 converts the input data into a machine coordinate system used for positioning by the NC machine, and outputs NC data input to the NC machine (step S6).

  NC data is input to the general-purpose surface modeler device 12. The cutter path based on the NC data is drawn on the surface model of the propeller by the surface modeler device 12. The operator looks at the display screen and checks whether or not an appropriate cutter path has been obtained (step S7).

  Although the production of the model propeller has been described in the present embodiment, it goes without saying that the NC data can be created in normal propeller production. The present invention is not limited to a propeller, and can be applied to NC data creation for using an NC processing machine.

1 shows a schematic configuration of a propeller NC machining data creation device. An example of propeller data is shown. The structure of a propeller numerical formula display apparatus is shown. The structure of a general-purpose surface modeler is shown. It is a flowchart which shows the propeller NC process data creation method. Shows the surface model of the propeller.

Explanation of symbols

2 ... Propeller shape data creation system 4 ... Propeller data 6 ... Propeller NC machining data creation device 8 ... Input device 10 ... Propeller formula display device 12 ... General-purpose surface modeler device 14 ... NC data creation device 16 ... Data creation device 18 ... Display device DESCRIPTION OF SYMBOLS 20 ... Arithmetic device 22 ... Data storage device 24 ... Output device 28 ... Output data 30 ... Blade formula data creation unit 32 ... Blade formula data 34 ... Blade surface point group data creation unit 36 ... Blade surface point group data 38 ... Blade surface method Line data creation unit 40 ... Wing surface normal data 42 ... Boss / fillet shape data 44 ... Surface modeler 46 ... Wing surface model 48 ... Boss / fillet surface model 50 ... Boss / fillet point cloud data creation unit 52 ... Boss / fillet Point cloud data 54 ... Boss fillet normal data creation unit 56 ... Boss fillet normal data 58 ... CL data creation unit 60 ... wing CL data 62 ... boss fillet CL data 64 ... wing 65 ... propeller 66 ... boss 68 ... fillet

Claims (9)

A wing formula data creation unit that inputs propeller data indicating a profile of a wing of a propeller having a free-form surface, and creates a formula that expresses the profile based on the propeller data;
A blade surface point group data creation unit for creating blade surface point group data which is point cloud data indicating the coordinates of each point on the surface of the blade based on the mathematical formula;
A blade surface angle data creating unit that creates blade surface angle data indicating an angle at each point on the surface of the blade based on the mathematical formula;
An NC machining data creation unit for creating NC machining data input to an NC machine to NC machine the blade based on the blade surface point group data and the blade surface angle data ;
A surface modeler for creating a surface model of a boss having a geometric curved surface to which the wing is attached;
A boss point cloud data creating unit for creating boss point cloud data which is point cloud data indicating the coordinates of each point of the boss based on the surface model of the boss;
A boss angle data creation unit for creating boss angle data indicating angles at respective points on the surface of the boss based on the surface model of the boss,
The NC machining data creation unit creates data to be input to an NC machine to NC machine the boss based on the boss point group data and the boss angle data, and adds the data to the NC machining data NC machining data creation device. A propeller NC machining data creation device according to claim 1,
The surface modeler is a propeller NC machining data creation device that creates a surface model of the wing based on the wing surface point cloud data and displays it together with the surface model of the boss . A propeller NC machining data creation device according to claim 1 or 2,
The surface modeler creates a fillet surface model at the base of the wing,
The propeller NC machining data creation device further includes:
A fillet point cloud data creating unit that creates fillet point cloud data that is point cloud data indicating the coordinates of each point of the fillet based on the surface model of the fillet;
A fillet angle data creation unit that creates fillet angle data indicating an angle at each point on the surface of the fillet based on the surface model of the fillet
And
The NC machining data creating unit creates data to be input to an NC machine for NC machining of the fillet based on the fillet point cloud data and the fillet angle data, and adds the data to the NC machining data. NC machining data creation device. A propeller NC machining data creation device according to any one of claims 1 to 3,
The propeller data is a three-sided view showing the shape of the wing, and a propeller NC machining data creation device. A propeller NC machining data creation device according to any one of claims 1 to 4,
The propeller NC machining data creation device, wherein the propeller data specifies the skew and rake of the blade and does not uniquely specify the three-dimensional shape of the blade . A propeller NC machining data creation device according to any one of claims 1 to 5,
A propeller NC machining data creation device that specifies which mathematical expression is applied as a mathematical expression expressing the profile in accordance with an input operation by an operator . Creating propeller data indicating a profile of a wing of a propeller having a free-form surface;
Creating a mathematical expression representing the profile based on the propeller data;
Creating wing surface point cloud data that is point cloud data indicating the coordinates of each point on the surface of the wing based on the mathematical formula;
Creating blade surface angle data indicating the angle at each point on the surface of the blade based on the formula;
Based on the blade surface point group data and the blade surface angle data, creating NC machining data to be input to an NC machine for NC machining the blade;
Creating a surface model of a boss having a geometric curved surface to which the wing is attached;
Creating boss point cloud data that is point cloud data indicating the coordinates of each point of the boss based on the surface model of the boss;
Creating boss angle data indicating an angle at each point on the boss surface based on the boss surface model;
Propeller NC machining data creation comprising the step of creating data to be input to an NC machine to NC machine the boss based on the boss point group data and the boss angle data and adding the data to the NC machining data Method. A propeller NC machining data creation method according to claim 7 ,
Creating a surface model of a fillet provided at the joint between the wing and the boss;
Creating fillet point cloud data which is point cloud data indicating the coordinates of each point of the fillet based on the surface model of the fillet;
Creating fillet angle data indicating angles at each point on the surface of the fillet based on the surface model of the fillet;
Propeller NC machining data creation comprising: creating data input to an NC machine to NC machine the fillet based on the fillet point group data and the fillet angle data and adding the data to the NC machining data Method. The propeller NC machining data creation method according to claim 7 or 8 ,
A step of checking tool interference in the NC machining data;
A method of creating propeller NC machining data, comprising: correcting the mathematical expression expressing the profile according to a result of the check.

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