JP5381063B2 - Machining parameter determination device, machining parameter determination method and program - Google Patents

Description

  The present invention relates to cutting of a die or the like, and more particularly, to a machining parameter determination apparatus having a tool attitude control for determining a machining parameter related to a tool attitude and a machining area, a machining parameter determination method having a tool attitude control, and a program.

  In cutting, machining parameters (for example, tool posture, machining area, tooling, etc.) must be determined so that the tool and holder do not interfere with the workpiece. In the shape having an upright wall or the like, the tool or the holder tends to approach the workpiece and cause interference. An operator checks the presence or absence of interference by using a machining simulation or the like in advance. If there is interference, the operator corrects the machining parameter to avoid the interference. The interference check and correction operations are repeated until there is no interference over the entire machining area.

  In cutting, it is desirable to secure rigidity by reducing the tool protrusion amount in order to shorten the processing time. However, interference is likely to occur in tooling with a small tool protrusion amount. In view of the above background, various methods have been proposed for determining a tool posture and a machining region where interference is unlikely to occur with tooling with a small tool protrusion amount.

  In Patent Document 1, an initial posture of a tool axis is set as a Z-axis direction, and a cone-shaped interference model for interference determination including a tool and a holder is generated. Next, the interference determination of the conical interference model including the tool and the holder and the curved surface (workpiece) is performed. When interference is detected in the interference determination, interference avoidance is performed by obtaining an interference avoidance angle of the tool posture based on the amount of interference and tilting the tool posture.

  In Non-Patent Document 1, the tool posture is expressed by the angle θ formed by the tool posture at the machining point and the normal of the curved surface, and the rotation angle φ of the tool posture. The interference determination is performed for all combinations in which θ and φ are changed from 0 degrees to 180 degrees. A combination of θ and φ where no interference has occurred is defined as a safe region. Determine the dominant tool position where interference is unlikely to occur from within the safe area.

In Patent Document 2, an interfered body is hypothesized in advance. In the processing simulation, the interfered body is moved, and when the curved surface interferes with the interfered body, the interference part of the interfered body is sequentially deleted. When the machining simulation is completed for the entire shape, a tooling that is included in the interfered body and has high rigidity is determined.
Japanese Patent Laid-Open No. 06-247441 JP 09-179620 A Morishige Koichi, Kase Saku, Takeuchi Yoshimi, “Tool path generation method for 5-axis control machining using C-Space”, Journal of Precision Engineering, Vol. 62, No. 12, p1783-1788, December 1996

  However, the above-described conventional techniques have the following problems.

  In patent document 1, after setting a tooling previously, an interference determination is performed and a tool attitude | position is determined. FIG. 10 is a schematic diagram showing interference check and correction. FIG. 11 is a schematic diagram showing a tool posture in which tooling rigidity is easily secured. In the left figure of FIG. 10, the curved surface 101 and the holder 102 holding the tool 103 interfere with each other. The right figure of FIG. 10 shows a state after correction by the method described in Patent Document 1. In the method described in Patent Document 1, it is only possible to determine a tool posture that avoids interference with a curved surface in the initially set tooling, and it is not possible to obtain a tool with high rigidity in an effective tool posture considering the curved surface shape. Further, since the tool posture after avoiding interference is determined only by the local interference amount, the finally determined tool posture is biased in the initially set direction as shown in the right diagram of FIG. For this reason, it is not possible to obtain a tool posture that takes into account the curved surface shape of the entire processing region as a target, and it is not possible to obtain a tool posture that facilitates ensuring tooling rigidity as shown in FIG.

  In Non-Patent Document 1, in order to obtain the attitude for avoiding interference, a huge amount of interference determination calculation is necessary for the combination of θ and φ, and the calculation load is large. Furthermore, when the number of shape elements such as holders increases, the load of interference calculation greatly increases. Similarly to Patent Document 1, a tool posture for avoiding interference can be obtained only after tooling is determined in advance.

  In Patent Document 2, since the tooling is calculated by first specifying the tool posture, the optimum tool posture cannot be automatically determined for the curved surface to be processed. Therefore, when a tool posture that is disadvantageous for interference avoidance is specified, there is a drawback that a tooling with low tooling rigidity is obtained as a result.

  Furthermore, in Patent Literature 1, Non-Patent Literature 1, and Patent Literature 2, it is necessary to designate a machining area in advance, and it is not possible to automatically calculate a machining area in which interference hardly occurs for each tool posture.

  The present invention has been made in view of the above-described problems, and its object is to determine a tool posture in which tooling rigidity is easily secured with a small calculation load, and to determine a machining region in which interference hardly occurs in the tool posture. It is to provide a machining parameter determination device or the like having tool posture control that can be performed.

In order to achieve the above-mentioned object, a first invention is a machining parameter determination device for determining at least a tool posture and a machining area among machining parameters, a polyhedron generating means for generating a polyhedron from shape data, and the polyhedron. Polyhedron information calculation means for calculating an area, a normal vector that is a unit vector indicating a normal direction, and a plane vector that is a product of the area and the normal vector, for all such polygonal planes; Based on all the plane vectors, a zeroth attitude vector indicating the direction of the zeroth attitude of the tool attitude is set , and inner products of the zeroth attitude vector and all the plane vectors are set as appropriate initial attitude values. a first 0 position setting means for calculating, for each combination of each said planar vector of the normal vector, the normal vector Calculating the inner product of the value multiplied by the weighting factor of Le and the plane vector as a provisional position appropriate value, when the maximum value of the same of the polygon the provisional position appropriate value for the plane is greater than the appropriate value the initial posture In addition, a processing region number for identifying the region that is processed by the normal vector used to calculate the maximum value of the provisional posture appropriate value is attached to the polygon plane, and the processing region number Posture / region determining means for determining the normal vector corresponding to the machining region number that maximizes the total area of the polygonal planes for each tool as the tool posture vector, and determining the machining region. And a region adjustment means for adjusting the machining region to be machined by the tool posture vector. The machining parameter determination device according to the first aspect of the invention can sequentially determine tool postures in which tooling rigidity is easily secured with a small calculation load, and can determine a machining region in which interference hardly occurs in the tool postures.

  The area adjustment means in the first invention calculates the inner product of each of the determined tool posture vectors including the zeroth posture vector and the plane vector for all the polygonal planes, and the calculated inner product is The machining area is adjusted so as to machine the polygonal plane with the largest tool posture vector. As a result, an inappropriate deviation of the machining area due to the order of determination of the tool posture is corrected.

  The 0th attitude setting means in the first invention sets a unit vector of the sum of all the plane vectors as the 0th attitude vector. The initial posture vector set in this way can be an appropriate tool posture over a wide range.

A second invention is a machining parameter determination method for determining at least a tool posture and a machining area among machining parameters, a polyhedron generating step for generating a polyhedron from shape data, and for all polygonal planes related to the polyhedron Based on all the plane vectors, a normal vector that is a unit vector indicating an area and a normal direction, a polyhedron information calculation step that calculates a plane vector that is a product of the area and the normal vector, and the tool A zeroth posture setting step for setting a zeroth posture vector indicating the direction of the zeroth posture of the posture, and calculating inner products of the zeroth posture vector and all the plane vectors as appropriate initial posture values; For each combination of line vector and each plane vector, the normal vector and the plane vector Calculating the inner product multiplied by a weighting factor value as a provisional position appropriate value, when the maximum value for the same of the polygonal plane the provisional posture proper value is greater than said initial posture appropriate value, the said polygonal plane Is attached with a processing region number for identifying the region processed by the normal vector used to calculate the maximum value of the provisional posture appropriate value, and the polygonal plane for each processing region number The normal vector corresponding to the machining area number having the maximum total area is determined as the tool attitude vector, and the attitude / area determination step for determining the machining area and the determined tool attitude vector And a region adjusting step for adjusting the processing region to be processed.

  The third invention is a program for causing a computer to function as the machining parameter determination device of the first invention.

  The present invention provides a machining parameter determination device having a tool posture control that can determine a tool posture in which tooling rigidity is easily secured with a small calculation load, and can determine a machining region in which the tool posture is unlikely to cause interference. can do.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a hardware configuration diagram of a computer that realizes a machining parameter determination apparatus 1 having tool posture control according to an embodiment of the present invention. Note that the hardware configuration in FIG. 1 is an example, and various configurations can be adopted depending on the application and purpose.

  The processing parameter determination device 1 includes a control unit 3, a storage unit 5, a media input / output unit 7, a communication control unit 9, an input unit 11, a display unit 13, a peripheral device I / F unit 15 and the like connected via a bus 17. Is done.

  The control unit 3 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like.

The CPU calls a program stored in the storage unit 5, ROM, recording medium or the like to a work memory area on the RAM, executes it, drives and controls each device connected via the bus 17, and the machining parameter determination device 1. The process to be described later is realized.
The ROM is a non-volatile memory and permanently holds a computer boot program, a program such as BIOS, data, and the like.
The RAM is a volatile memory, and temporarily stores programs, data, and the like loaded from the storage unit 5, ROM, recording medium, and the like, and includes a work area used by the control unit 3 for performing various processes.

The storage unit 5 is an HDD (hard disk drive), and stores a program executed by the control unit 3, data necessary for program execution, an OS (operating system), and the like. With respect to the program, a control program corresponding to an OS (operating system) and an application program for causing a computer to execute processing described later are stored.
Each of these program codes is read by the control unit 3 as necessary, transferred to the RAM, read by the CPU, and executed as various means.

  The media input / output unit 7 (drive device) inputs / outputs data, for example, a CD drive (-ROM, -R, -RW, etc.), DVD drive (-ROM, -R, -RW, etc.), MO drive, etc. And other media input / output devices.

  The communication control unit 9 includes a communication control device, a communication port, and the like, and is a communication interface that mediates communication between the computer and the network 19, and performs communication control between other computers via the network 19.

The input unit 11 inputs data and includes, for example, a keyboard, a pointing device such as a mouse, and an input device such as a numeric keypad.
An operation instruction, an operation instruction, data input, and the like can be performed on the computer via the input unit 11.

  The display unit 13 includes a display device such as a CRT monitor and a liquid crystal panel, and a logic circuit (such as a video adapter) for realizing a video function of the computer in cooperation with the display device.

  The peripheral device I / F (interface) unit 15 is a port for connecting a peripheral device to the computer, and the computer transmits and receives data to and from the peripheral device via the peripheral device I / F unit 15. The peripheral device I / F unit 15 is configured by USB, IEEE 1394, RS-232C, or the like, and usually has a plurality of peripheral devices I / F. The connection form with the peripheral device may be wired or wireless.

  The bus 17 is a path that mediates transmission / reception of control signals, data signals, and the like between the devices.

  Next, an overview of functions of the machining parameter determination device 1 will be described with reference to FIGS. 2, 3, and 4. FIG. 2 is a schematic configuration diagram of the processing parameter determination device 1. FIG. 3 is a diagram illustrating an example of the curved surface 31 and the polyhedron 32. FIG. 4 is a diagram illustrating an example of the posture / region database 22 after the 0th posture is set.

  The processing parameter determination apparatus 1 includes a shape database 21, a posture / region database 22, a polyhedron generation unit 23, a polyhedron information calculation unit 24, a zeroth posture setting unit 25, a posture / region determination unit 26, a region adjustment unit 27, and the like.

  The shape database 21 holds shape data of a workpiece (curved surface) registered in advance. The shape database 21 holds data defining the shape of the curved surface 31 shown in the left diagram of FIG.

  The posture / region database 22 holds the processing results of each means described later. As shown in FIG. 4, the posture / region database 22 includes a plane number 41, vertex coordinates 42, area 43, normal vector 44, plane vector 45, posture vector number 46, processing region number 47, posture appropriate value 48, and the like. Have. Detailed description of each item will be made together with the description of each means described later.

  The polyhedron generating means 23 generates a polyhedron 32 shown in the right diagram of FIG. 3 from the shape data of the workpiece (curved surface). In this embodiment, as an example, it is assumed that a polyhedron approximated by dividing a curved surface by a triangular plane is generated. The embodiment of the present invention is not limited to a triangular plane, and may be another polygonal plane. The polyhedron generation unit 23 acquires shape data from the shape database 21 and registers the generated polyhedron information in the posture / region database 22. The items in the posture / region database 22 registered by the polyhedron generating unit 23 are a plane number 41 that is a number for uniquely identifying the divided triangular plane, and a vertex coordinate 42 that is a coordinate of a vertex defining the triangular plane.

  The polyhedron generating means 23 divides the curved surface into triangular planes with shape accuracy within a predetermined threshold when dividing the curved surface into triangular planes. The shape accuracy uses, for example, the distance from the curved surface to be approximated to the triangular plane as an index. When the distance from the curved surface to be approximated to the triangular plane exceeds the threshold, the polyhedron generating means 23 further divides the curved surface. As shown in the right diagram of FIG. 3, the portion where the curved surface is tight is divided by many triangular planes. Further, the portion where the curved surface is loose is divided by a few triangular planes.

  The polyhedron information calculation means 24 calculates an area, a normal vector, and a plane vector for all planes. The normal vector is a unit vector indicating the normal direction of the triangular plane. A plane vector is a product of an area (scalar value) and a normal vector. The plane vector is a value that quantitatively represents the strength in the direction in which the triangular plane faces. The items in the posture / region database 22 registered by the polyhedron information calculation unit 24 are an area 43, a normal vector 44, and a plane vector 45.

  The zeroth posture setting means 25 sets a zeroth posture (initial posture) vector indicating the direction of the zeroth posture (initial posture) of the tool posture. The 0th attitude setting means 25 sets the unit vector of the sum of all plane vectors 45 as the 0th attitude vector. That is, the 0th posture setting means 25 registers the plane number 41 as “0”, the normal vector 44 as the 0th posture vector, and the posture vector number 46 as “0” in the posture / region database 22. Note that the polyhedron information calculation unit 24 described above assigns and registers “1” or later to the plane number 41 so as not to overlap with the plane number of the 0th posture vector. In the record of the normal vector 44 finally adopted as the tool posture, sequential numbers from “0” are registered in the item of the posture vector number 46 in the order of adoption. In the record of the normal vector 44 that is not adopted as the tool posture, the posture vector number 46 remains “−” (NULL value).

  Since the 0th posture vector set by the 0th posture setting means 25 is a unit vector of the sum of all the plane vectors 45, the directions of all the triangular planes are reflected. Since the 0th posture vector set in this way can be said to represent the direction of the workpiece (curved surface) as a representative, it can be an appropriate tool posture vector in a wide range.

  Further, the 0th posture setting means 25 calculates the inner product of the 0th posture vector and the plane vector for all triangular planes, and sets the posture appropriate value 48 of the posture / region database 22 as the initial posture appropriate value. Register the calculation result. Since the inner product of the 0th posture vector and the plane vector indicates the degree to which the triangular plane faces the 0th posture, whether or not the tool posture is appropriate can be determined by the posture appropriate value 48. . Further, the 0th posture setting means 25 registers “0” in the machining area number 47 for all triangular planes whose posture proper value 48 is a positive value. Thus, in the machining area number 47, the plane number 41 to be machined with the tool posture vector to be machined is registered. Also, in the proper posture value 48, a proper posture value corresponding to the tool posture vector to be processed is registered. Note that the triangular plane having a negative inner product with the 0th posture vector is not a processing target, and the processing region number 47 and the posture appropriate value 48 remain “−” (NULL value).

  FIG. 4 shows a state in which the processes by the polyhedron generation unit 23, the polyhedron information calculation unit 24, and the zeroth posture setting unit 25 have been completed. Hereinafter, in order to simplify the description, in the case of explaining the drawings showing the posture / region database 22 (= FIG. 4, FIG. 6, FIG. 7), the record whose plane number 41 is “0” is referred to as “0th record”, A record whose plane number 41 is “1” is described as “first record”.

  In the 0th record, the normal vector 44 is “0.1, 0.0, 0.995”, the posture vector number 46 is “0”, and the other items are “−” (NULL value). The 0th record is registered by the 0th attitude setting means 25.

  In the first record, the plane number 41 is “1”, the vertex coordinates 42 are “p1, p2, p5”, the area 43 is “12.5”, and the normal vector 44 is “0.5, 0.6, 0. 625 ”, the plane vector 45 is“ 6.25, 7.5, 7.81 ”, the posture vector number 46 is“ − ”(NULL value), the machining area number 47 is“ 0 ”, and the posture appropriate value 48 is“ 8 ”. .40 ". The plane number 41 and the vertex coordinates 42 are registered by the polyhedron generating means 23. The area 43, the normal vector 44, and the plane vector 45 are registered by the polyhedron information calculation unit 24. The processing area number 47 and the posture appropriate value 48 are registered by the 0th posture setting means 25. The second and subsequent records are registered in the same manner as the first record.

  The posture / region determining means 26 determines a tool posture vector after the 0th posture (initial posture) and also determines a machining region to be machined based on the determined tool posture vector. However, the processing area determined here is a provisional area adjusted by the area adjusting means 27 described later. Details of the posture / region determination means 26 will be described later.

  The area adjustment unit 27 calculates the inner product of each of the determined tool posture vectors including the 0th posture (initial posture) vector and the surface vector for all the triangular planes, and the tool posture vector having the largest calculated inner product. To adjust the processing area so as to process the triangular plane. Details of the area adjusting means 27 will be described later.

  Next, details of the posture / region determination means 26 will be described with reference to FIGS. 4, 5, and 6. FIG. 5 is a flowchart showing details of the processing of the posture / region determining means 26. FIG. 6 is a diagram showing an example of the posture / region database 22 after the processing up to the processing of the posture / region determination means 26 is performed.

  As shown in FIG. 5, the control unit 3 of the machining parameter determination apparatus 1 refers to the posture / region database 22 and selects a normal vector Ti as a tool posture vector candidate (S101). As the normal vector Ti, normal vectors 44 of records whose posture vector number 46 in the posture / region database 22 is “−” (NULL value) are sequentially selected. For example, in the example illustrated in FIG. 4, the posture vector number 46 of the first record is “−” (NULL value). Therefore, the control unit 3 first selects the value “0.5, 0.6, 0.625” of the normal vector 44 of the first record as the normal vector Ti. The subscript i is the same from S102 to S106 described later. Next, when S101 is executed, the subscript i is incremented, and the next normal vector Ti (in the example shown in FIG. 4, the value “0.2, 0.3, 0 of the normal vector 44 of the second record). .933 ").

  Next, the control unit 3 calculates a provisional posture appropriate value Eij (= α · Ti · Pj) (S102). Here, α is a weighting coefficient (scalar value), Pj is a plane vector, and Ti · Pj is an inner product of Ti and Pj. For the plane vector Pj, for example, in the example shown in FIG. 4, the plane vector 45 is selected as the plane vector Pj in the order of the first record, the second record,. The subscript j is the same from S103 to S105 described later. Next, when executing S102, the subscript j is moved up and a different plane vector 45 is selected.

  Here, the weighting coefficient α will be described. The weighting coefficient α is a coefficient for adjusting the number of divisions of the machining area and the number of tool postures, and the value is set to 0.0 to 1.0. When the value set as the weighting factor α is small, the number of machining areas and the number of tool postures finally determined are reduced. If the number of machining areas and the number of tool postures are reduced, the tool posture is set coarsely and the interference avoidance operation becomes rough, but the machining time is shortened. On the other hand, when the value set as the weighting factor α is large, the number of machining areas and the number of tool postures increase, and the tool posture is finely set and the interference avoidance operation becomes precise, but the machining time becomes long. The user can cause the machining parameter determination apparatus 1 to determine a machining parameter corresponding to a desired interference avoidance characteristic and machining time by adjusting a value set for the weighting factor α.

  Next, the control unit 3 checks whether or not the provisional posture appropriate value Eij is larger than the posture proper value 48 of the posture / region database 22 (S103). Here, the comparison target is the posture appropriate value 48 of the record selected in S102. For example, when i = 1 and j = 1, the value “8.40” of the posture appropriate value 48 of the first record in FIG. 4 is a comparison target. For example, when i = 1 and j = 2, the value “3.31” of the posture appropriate value 48 of the second record in FIG. 4 is a comparison target.

  When the determination in S103 is Yes, the control unit 3 updates the posture appropriate value 48 and the machining region number 47 in the posture / region database 22 (S104). The updated value is the appropriate posture attitude value Eij calculated in S102, and the processing area number 47 is the plane number 41 related to the normal vector Ti selected in S101. When the determination in S103 is No, the control unit 3 proceeds to S105.

  Next, the control unit 3 confirms whether the processing has been completed for all the plane vectors Pj (S105). If the process has not ended, the control unit 3 repeats the process from S102. When the process is finished, the control unit 3 proceeds to S106.

  Next, the control unit 3 confirms whether the processing has been completed for all normal vectors Ti (S106). If the process has not ended, the control unit 3 repeats the process from S101. When the process is finished, the control unit 3 proceeds to S107.

  Next, the control unit 3 calculates the sum of the areas 43 for each machining region number 47 in the posture / region database 22, and uses the normal vector Ti corresponding to the machining region number 47 with the maximum calculation result as a tool posture vector. Determine (S107).

  Next, the control unit 3 registers the posture vector number 46 (S108). As the posture vector number 46, sequential numbers from “0” are registered in the order of adoption as the tool posture vector. For example, when the normal vector Ti is determined as the tool posture vector indicating the tool posture of the first posture in S107, “1” is registered in the posture vector number 46 of the record corresponding to the normal vector Ti.

  As described above, each time the processes from S101 to S108 are performed, one tool posture vector of the kth posture (k = 1, 2,...) After the 0th posture is determined. After determining the tool posture vector of the kth posture, the control unit 3 repeats the processing from S101 to S108 in order to determine the tool posture vector of the (k + 1) th posture. This iterative process may be terminated when, for example, the process of S104 is never executed and the posture appropriate value 48 is not updated at all. In addition, for example, the number of tool postures to be determined may be determined in advance, and the repetition process may be terminated when the number is reached.

  FIG. 6 shows an example in which the processing from S101 to S108 shown in FIG. 5 is executed at least twice. In the example shown in FIG. 6, the provisional posture appropriate value Eij is calculated with the weighting coefficient α = 0.95.

  In the first process, the control unit 3 determines the normal vector 44 of the first record as the tool posture vector of the first posture, and “1” (= value indicating the order of determination) in the posture vector number 46 of the first record. ) Is registered. Processing for this result will be described below.

制御部３は、Ｓ１０３において、暫定姿勢適正値Ｅｉｊ＝１２．５１と、図４の第１レコードの姿勢適正値４８の値「８．４０」を比較し、暫定姿勢適正値Ｅｉｊの方が大きいと判定する。次に、制御部３は、Ｓ１０４において、図６に示すように、姿勢適正値４８を「１１．８８」、加工領域番号４７を「１」に更新する。 When i = 1 and j = 1, the control unit 3 calculates a provisional posture appropriate value Eij as shown in the following equation in S102.

In S103, the control unit 3 compares the provisional posture appropriate value Eij = 12.51 with the value “8.40” of the posture proper value 48 of the first record in FIG. 4, and the provisional posture proper value Eij is larger. Is determined. Next, in S104, the control unit 3 updates the posture appropriate value 48 to “11.88” and the machining area number 47 to “1” as shown in FIG.

制御部３は、Ｓ１０３において、暫定姿勢適正値Ｅｉｊ＝３．３２と、図４の第２レコードの姿勢適正値４８の値「３．３１」を比較し、暫定姿勢適正値Ｅｉｊの方が大きいと判定する。次に、制御部３は、Ｓ１０４において、図６の第２レコードの姿勢適正値４８を「３．３２」、加工領域番号４７を「２」に更新する。 Next, when i = 2 and j = 2, the control unit 3 calculates a provisional posture appropriate value Eij as follows in S102.

In S103, the control unit 3 compares the provisional posture appropriate value Eij = 3.32 with the value “3.31” of the posture proper value 48 of the second record in FIG. 4, and the provisional posture proper value Eij is larger. Is determined. Next, in S104, the control unit 3 updates the posture appropriate value 48 of the second record in FIG. 6 to “3.32” and the machining area number 47 to “2”.

  The control unit 3 determines that the provisional posture appropriate value Eij is smaller in S103 except for (1) i = 1, j = 1, (2) i = 2, and j = 2, and the posture appropriate value 48, The machining area number 47 is not updated.

  In S107, the control unit 3 indicates that the total area of the processing area number 47 is “1” (in this example, it is one record, but is usually the sum of records for a plurality of records). The normal vector 44 “0.5, 0.6, 0.625” having the plane number 41 of “1” as the corresponding normal vector is determined as the tool posture vector of the first posture. In S108, the control unit 3 registers “1” in the posture vector number 46 whose plane number 41 is “1”.

  In the second process, the control unit 3 determines the normal vector 44 of the second record as the tool posture vector of the second posture, and “2” (= value indicating the order of determination) in the posture vector number 46 of the second record. ) Is registered. This result can be obtained by performing the processing from S101 to S108 again, as in the first processing described above.

  Next, the details of the region adjusting means 27 will be described with reference to FIGS. FIG. 7 is a diagram illustrating an example of the posture / region database 22 after the processing up to the processing of the region adjustment unit 27 is executed.

  FIG. 7 shows a result of area adjustment performed by the area adjustment unit 27 on the posture / area database 22 shown in FIG. The area adjusting unit 27 calculates the inner product of each of the determined tool posture vectors including the tool posture vector of the zeroth posture and the plane vector 45. The determined tool posture vector is a normal vector 44 of a record in which the value of the posture vector number 46 is not “−” (NULL value). In the example illustrated in FIG. 6, the determined tool posture vectors are the three normal vectors 44 of the 0th record, the 1st record, and the 2nd record.

  First, the area adjustment related to the first record in FIG. 7 will be described. The inner product of the normal vector 44 of the 0th record and the plane vector 45 of the 1st record is “8.40”. The inner product of the normal vector 44 of the first record and the plane vector 45 of the first record is “12.51”. The inner product of the normal vector 44 of the second record and the plane vector 45 of the first record is “10.79”. Since the largest value is “12.51”, the control unit 3 sets the machining area number 47 to “1”, the posture appropriate value so as to machine with the tool posture vector corresponding to the normal vector 44 of the first record. 48 is updated to “12.51”.

  Next, the area adjustment relating to the third record in FIG. 7 will be described. The inner product of the normal vector 44 of the 0th record and the plane vector 45 of the third record is “6.08”. The inner product of the normal vector 44 of the first record and the plane vector 45 of the third record is “4.84”. The inner product of the normal vector 44 of the second record and the plane vector 45 of the third record is “6.14”. Since the largest value is “6.14”, the control unit 3 sets the machining area number 47 to “2” and the appropriate posture value so as to perform machining with the tool posture vector corresponding to the normal vector 44 of the second record. 48 is updated to “6.14”.

  As described above, after the processing by the posture / region determination unit 26, the region adjustment unit 27 performs region adjustment, so that an inappropriate deviation of the machining region due to the order of determination of the tool posture (= according to the previously determined tool posture). The area to be processed becomes larger).

  Next, an embodiment of the present invention for a hemispherical workpiece will be described with reference to FIGS. FIG. 8 is a diagram illustrating an example in which the processing up to the processing of the posture / region determination unit 26 is executed. FIG. 9 is a diagram showing an embodiment executed up to the processing of the area adjusting means 27.

  As shown in FIGS. 8 and 9, in this embodiment, five tool postures from the 0th posture to the fourth posture are determined. In FIG. 8, which is the stage executed up to the processing of the posture / region determining means 26, it can be seen that the region to be machined is increased by the previously determined tool posture. On the other hand, in FIG. 9, which is the stage executed up to the processing of the area adjusting means 27, it can be seen that the machining area is corrected.

  According to the embodiment of the present invention, it is possible to easily determine a tooling having high rigidity by determining a tool posture in which tooling rigidity is easily secured and determining a machining region to be machined based on the tool posture. . For example, a method described in Japanese Patent Laid-Open No. 09-179620 of Patent Document 2 may be applied as a tooling determination method.

  In the cutting process, (1) a method of machining a spatially continuous machining region while continuously changing the tool posture, and (2) a method of dividing and machining each machining region of the same tool posture. There are two ways. If the embodiment of the present invention is applied to the machining method of (2), the machining posture and machining area suitable for avoiding interference can be aggregated into a small number, so that machining is less disrupted and machining with high rigidity and efficiency is achieved. can do. It is also useful when determining machining parameters for partial machining of the workpiece.

  In the embodiment of the present invention, since the calculation of interference between the workpiece and the tool is not required, the calculation load does not increase even if the workpiece has a complicated shape.

  The preferred embodiments of the processing parameter determination device and the like according to the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these naturally belong to the technical scope of the present invention. Understood.

Hardware configuration diagram of a computer that realizes the machining parameter determination device 1 Schematic configuration diagram of the machining parameter determination device 1 The figure which shows an example of the curved surface 31 and the polyhedron 32 The figure which shows an example of the attitude | position / area | region database 22 after 0th attitude | position setting Flowchart showing details of processing of posture / region determination means 26 The figure which shows an example of the attitude | position / area | region database 22 after performing even the process of the attitude | position / area | region determination means 26 The figure which shows an example of the attitude | position and area | region database 22 after performing even the process of the area | region adjustment means 27 The figure which shows the Example performed to the process of the attitude | position determination means 26 The figure which shows the Example performed to the process of the area | region adjustment means 27 Schematic diagram showing interference check and correction Schematic diagram showing tool posture that facilitates ensuring tooling rigidity

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ......... Processing parameter determination apparatus 3 ......... Control part 5 ......... Storage part 7 ......... Media input / output part 9 ......... Communication control part 11 ......... Input part 13 ......... Display part 15 ... ... Peripheral device I / F unit 17 ......... Bus 19 ......... Network 21 ......... Shape database 22 ......... Attitude / region database 23 ......... Polyhedron generation means 24 ......... Polyhedron information calculation means 25 ......... 0th posture setting means 26... Posture / area determination means 27... Area adjustment means 31... Curved surface 32... Polyhedron 41... Plane number 42. ...... Normal vector 45 ......... Plane vector 46 ......... Attitude vector number 47 ......... Machining area number 48 ......... Attitude appropriate value 101 ......... Surface 102 ......... Holder 103 ......... Tool

Claims (5)

A machining parameter determination device for determining at least a tool posture and a machining area among machining parameters,
Polyhedron generating means for generating a polyhedron from shape data;
Polyhedron information calculation that calculates an area, a normal vector that is a unit vector indicating a normal direction, and a plane vector that is a product of the area and the normal vector for all polygonal planes related to the polyhedron. Means,
Based on all the plane vectors, a zeroth attitude vector indicating the direction of the zeroth attitude of the tool attitude is set , and inner products of the zeroth attitude vector and all the plane vectors are set as appropriate initial attitude values. 0th posture setting means for calculating ;
For each combination of the normal vector and the plane vector, a value obtained by multiplying an inner product of the normal vector and the plane vector by a weighting factor is calculated as a provisional posture appropriate value, and the same polygon plane When the maximum value of the appropriate provisional posture value is greater than the appropriate initial posture value, the normal vector used for calculating the maximum value of the proper temporary posture value for the polygonal plane is used. A machining region number for identifying that the region is to be machined is attached, and the normal vector corresponding to the machining region number that maximizes the total area of the polygonal plane for each machining region number is the tool orientation. While determining as a vector, the posture / region determining means for determining the processing region ,
Area adjusting means for adjusting the machining area to be machined according to the determined tool posture vector;
A processing parameter determination apparatus comprising:   The area adjusting unit calculates an inner product of each of the determined tool posture vectors including the zeroth posture vector and the plane vector for all the polygonal planes, and the calculated inner product is the largest. The processing parameter determination apparatus according to claim 1, wherein the processing region is adjusted so as to process the polygonal plane based on a posture vector.   2. The processing parameter determination device according to claim 1, wherein the 0th attitude setting unit sets a unit vector of a sum of all the plane vectors as the 0th attitude vector. A machining parameter determination method for determining at least a tool posture and a machining area among machining parameters,
A polyhedron generation step for generating a polyhedron from shape data;
A polyhedron information calculation step for calculating a normal vector that is a unit vector indicating an area and a normal direction, a plane vector that is a product of the area and the normal vector, for all polygonal planes related to the polyhedron;
Based on all the plane vectors, a zeroth attitude vector indicating the direction of the zeroth attitude of the tool attitude is set , and inner products of the zeroth attitude vector and all the plane vectors are set as appropriate initial attitude values. A 0th posture setting step to calculate ;
For each combination of the normal vector and the plane vector, a value obtained by multiplying an inner product of the normal vector and the plane vector by a weighting factor is calculated as a provisional posture appropriate value, and the same polygon plane When the maximum value of the appropriate provisional posture value is greater than the appropriate initial posture value, the normal vector used for calculating the maximum value of the proper temporary posture value for the polygonal plane is used. A machining region number for identifying that the region is to be machined is attached, and the normal vector corresponding to the machining region number that maximizes the total area of the polygonal plane for each machining region number is the tool orientation. While determining as a vector, a posture / region determination step for determining the processing region ;
An area adjustment step for adjusting the machining area to be machined according to the determined tool posture vector;
The processing parameter determination method characterized by including. Program to function as a processing Pameta determination device according to claim 3 computers claim 1.

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