JP2001087814A - Method for preparing control data for pushing-through and bending machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for preparing control data for pushing-through/ bending machines by which the control data for realizing pushing-through and bending work with high accuracy can be generated. SOLUTION: In a local coordinate system yz which is set to the cross section of a long size product 51, the long size product 51 which is extended in front of a fixed die 12 is reproduced. When a movable die 13 is fictively superposed on the long size product 51 on this local coordinate system yz, the position y of the movable die 13 is correctly specified on the local coordinate system. This position y of the movable die 13 is the reflection of the bending deformation of the long size product 51 which is formed between the fixed die 12 and the movable die 13. When the moving quantity of the movable die 13 is calculated based on the position y of the movable die 13 specified in this way, the ideal moving quantity of the movable die 13 is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push-through bending machine capable of performing bending deformation on a long material successively passing through a fixed mold and a movable mold through relative displacement of the movable mold with respect to the fixed mold. The present invention relates to a control data generating method for generating control data used for controlling such a push-through bending machine.

[0002]

2. Description of the Related Art Generally, a press-through bending machine includes a fixed die and a movable die disposed in front of the fixed die and displaced relative to the fixed die. For example, while an aluminum profile passes successively through fixed and movable molds,
When the movable die moves in a plane perpendicular to the direction of travel of the profile, bending (plastic deformation) is caused in the profile. In such a push-through bending machine, it is possible to relatively easily realize a bending process of various bending conditions irrespective of two dimensions or three dimensions through the movement of a movable die along one plane. .

[0003]

As in the case of a general machine tool, the operation of the push-through bending machine can be controlled by a control program such as an NC (numerical control) program. In such a control program, control data such as a movable displacement amount must be defined. Until now, such control data has been created based on the intuition and empirical rules of skilled workers.
Prototyping of products is repeated using such control data,
The control data was rewritten each time the prototype was implemented.
As a result of repeating these prototypes several tens of times, eventually,
Control data has been established that can achieve bending deformation as desired.

For example, Japanese Patent Application Laid-Open Nos. 9-327727 and 10-166064 disclose attempts to create control data without relying on the intuition and empirical rules of a skilled worker. According to these attempts, a prototype that roughly resembles the final shape can be formed at the initial prototype stage. Therefore, it is not necessary to rely on the intuition and empirical rules of the operator from the beginning, and the labor and labor for reprototyping and rewriting control data are reduced.

In the control data creation methods described in these publications, the x-axis of a three-dimensional coordinate system is used to calculate the position of the movable die. The traveling direction of the profile, that is, the axis, is specified by the x-coordinate axis. The movable plane of the movable mold is orthogonal to the x coordinate axis. However, in practice, the axial direction of a bent and deformed profile cannot be uniformly represented by one straight line. Therefore, even if the movable plane of the movable mold is made orthogonal to the x-coordinate axis, the movable plane of the movable mold cannot always accurately reflect the mechanical coordinate system of the push-through bending machine. As a result, even if the position of the movable mold is specified on such a moving plane, the shape accuracy after processing cannot be increased to a level that can withstand general practical use.

The present invention has been made in view of the above circumstances, and has as its object to provide a control data creating method for a push-through bending machine capable of generating control data for realizing the push-through bending with high accuracy.

[0007]

According to a first aspect of the present invention, there is provided a method for obtaining shape data representing a shape of a long product in accordance with an entire coordinate system, and a step of pushing through based on the shape data. A step of setting a local coordinate system specified based on the fixed type of the bending machine for each section of the long product, and a step of calculating the position of the movable die of the push-through bending machine based on the local coordinate system And a control data generating method for a push-through bending machine.

According to such a control data creating method, a long product extending forward from a fixed type can be reproduced in the local coordinate system set on the cross section of the long product. When the movable type is virtually superimposed on the long product on the local coordinate system, the position of the movable type can be specified on the local coordinate system. The position of the movable mold reflects the bending deformation of the long product formed between the fixed mold and the movable mold. If the amount of movement of the movable mold is calculated based on the position of the movable mold specified in this way, an ideal amount of movement of the movable mold can be obtained. Control data of the push-through bending machine may be created based on the obtained movement amount. If the control data thus created is supplied to the push-through bending machine, it is possible to realize an ideal movable type movement that accurately reflects the shape of a long product.

The method for creating control data for a push-through bending machine includes a step of specifying at least one parametric curve representing the degree of bending of the long product based on the shape data, and a step of specifying each parametric curve specified on the parametric curve. The method may further include a step of calculating a tangent vector to the parametric curve for each control point, and a step of specifying the cross section for each control point of the parametric curve based on the calculated tangent vector.

In general, in a parametric curve, the number of control points increases as the curvature of the curve to be expressed increases, and conversely, the number of control points decreases as the curvature of the curve decreases. Therefore, if each section of a long product is defined while taking advantage of such a parametric curve, the number of cross sections increases as the curvature of the long product increases, and as a result, it can be finely moved according to the magnitude of the curvature. The movement of the mold can be controlled.

In calculating the position of the movable die, the method for creating control data for a press-through bending machine includes a step of specifying an approach distance between the fixed die and the movable die on the local coordinate system. The method may further include a step of defining a movable moving plane on the local coordinate system based on the approach distance, and a step of specifying an intersection of the moving plane and the parametric curve on the local coordinate system. When the above-described parametric curve is used, the position of the movable type can be relatively easily specified simply by specifying the movable plane on the local coordinate system.

According to the second invention, the local coordinate system specified on the basis of the fixed type of the push-through bending machine is defined in the overall coordinate system for specifying the shape of the long product. A method for creating control data for a bending machine is provided. According to this control data creation method, the first
Similarly to the invention, the position of the movable type can be specified according to the local coordinate system specified based on the fixed type. The position of the movable mold reflects the bending deformation of a long product formed between the fixed mold and the movable mold. Therefore, if the amount of movement of the movable mold is calculated based on the position of the movable mold thus specified, ideal movement of the movable mold will be realized.

In calculating the position of the movable die, the local coordinate system may be redefined for each feed position defined in the longitudinal direction of the long product. If the local coordinate system is redefined for each feed position in this way, it is possible to specify the displacement of the movable mold continuously along the longitudinal direction of the long product. Based on the specified continuous displacement, continuous movement of the movable type can be realized.

Further, according to the third invention, a step of acquiring shape data of a long product from the computer-aided design system, and for each feed position defined in the longitudinal direction of the long product based on the acquired shape data. Generating control data for specifying the position of the movable die of the push-through bending machine.

In recent years, so-called computer-aided design (CAD) has been remarkably developed in the field of product design. However, so far, in the field of plastic working, at present, such product data created by CAD is not used efficiently. According to such a control data creation method, it is possible to easily and efficiently create control data of a push-through bending machine using shape data created by CAD. Here, it is desirable that the shape data defines at least one curve expressing the degree of bending of the long product.

The above-described method of creating control data for a push-through bending machine may be configured as a software program executed by a computer. Such a software program may be loaded into a computer through a portable recording medium such as a floppy disk (FD), a compact disk (CD), or a digital video disk (DVD), and may be a LAN (local communication network) or a WAN (wide area communication). Network), and may be loaded into a computer through a network such as the Internet.

[0017]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 schematically shows the entire structure of a press-through bending machine. This push-through bending machine 10 is a long material 1
A pair of front and rear molds for guiding the forward movement of the vehicle, ie, a fixed mold 1
2 and a movable die 13, and a feed mechanism 14 for feeding the long material 11 toward the fixed die 12 and the movable die 13. In the push-through bending machine 10, as described later, when the movable die 13 moves in a plane orthogonal to the traveling direction of the long material 11, bending deformation (plastic deformation) is caused in the long material 11.

The feed mechanism 14 includes, for example, a pusher, ie, a slider 15 that contacts the rear end of the long material 11, and a screw shaft 17 that converts the rotational force of the feed motor 16 into a propulsive force of the slider 15. When the screw shaft 17 rotates in the forward direction by the action of the feed motor 16, the slider 15 moves forward in accordance with the rotation, and when the screw shaft 17 rotates in the reverse direction, the slider 15 can retreat. The advance of the slider 15 causes the elongate member 11 to advance. The amount of advance of the slider 15, that is, the amount of feed of the long material 11, can be determined according to the amount of rotation of the screw shaft 17, that is, the amount of rotation of the feed motor 16. A so-called servo motor may be used as the feed motor 16.

In such a press-through bending machine 10, a solid long material or a hollow long material 11 can be machined. The hollow long member 11 can be represented by, for example, an extruded member made of aluminum, that is, a shape member or an iron pipe member. Generally, in the long material 11, a common cross-sectional shape is defined over its entire length. However, the cross-sectional shape does not always need to be constant over the entire length of the long material 11.

The feed mechanism 14 and the fixed mold 12 described above are supported by a so-called pendulum member 19. As is apparent from FIG. 2, the cylindrical outer peripheral surface of the pendulum member 19 is supported by the support base 21 through the bearing 20 arranged along the semi-cylindrical surface. According to the operation of the pendulum member 19, the long material 1
1 can rotate together with the fixed mold 12 around the central axis 22 of the fixed mold 12. Such rotation is useful, for example, when causing the long material 11 to be twisted. Pendulum member 1
The rotation of No. 9 may be realized through the operation of the drive motor 23 composed of, for example, a servomotor.

As shown in FIG. 2, the fixed mold 12 includes
A through-hole 24 is formed that looks like the outer shape of the long material 11. The forward movement of the long material 11 is guided by the through holes 24. The cross-sectional shape of the long material 11 is the through hole 2 shown in FIG.
As apparent from FIG. 4, not only a simple shape such as a circle, an ellipse, a triangle, and other polygons, but also other complicated shapes may be used. The shape of the through hole 24 may be adjusted to the sectional shape of the long material 11.

As is apparent from FIG. 2, the hollow long material 1
When 1 is processed, it is desirable that a core metal, that is, a core 25 be inserted into the hollow space of the long material 11 surrounded by the fixed mold 12. As is well known, in the push-through bending machine 10, the largest bending stress acts on the long material 11 near the exit of the fixed die 12 side through hole 24. At this time, if the long member 11 is hollow, the cross-sectional shape of the long member 11 may be crushed at the edge of the through hole 24. As a result, a large error occurs in the amount of bending deformation of the long material 11 or an unnecessary depression is formed on the outer peripheral surface of the long material 11. If the core 25 comes into contact with the inside of the long member 11, such crushing of the long member 11 can be avoided as much as possible.

As is clear from FIG. 1, the core 25 includes:
A control motor 26 for moving the core 25 back and forth is connected. The core 25 is moved in and out of the long material 11 by the operation of the control motor 26. Moreover, in the present embodiment, a control motor 27 that rotates the core 25 around the central axis 22 of the fixed mold 12 is connected to the core 25. As described above, when the fixed mold 12 rotates around the central axis 22 with the rotation of the pendulum member 19, the control motor 27 can rotate the core 25 around the central axis 22 in accordance with this rotation. As the control motors 26 and 27, for example, a servo motor may be used.

Referring to FIGS. 1 and 3, the movable die 13 is formed with a through-hole 28 that imitates the outer shape of the long material 11, similarly to the fixed die 12. The forward movement of the long material 11 is guided by the through hole 28. It is desirable that the shape of the through hole 28 matches the shape of the fixed mold 12 side through hole 24, for example.

The movable die 13 can move in a moving plane orthogonal to the extension of the central axis 22 of the fixed die 12.
The movement of the movable mold 13 is realized by, for example, a combination of the vertical movement of the vertical movement member 29 and the horizontal movement of the horizontal movement member 30. The vertical moving member 29 is guided by the horizontal moving member 30 so as to be vertically displaceable, that is, vertically displaceable. At the same time, the horizontal moving member 30 is supported by the guide member 31 so as to be displaceable in the horizontal direction. The displacement of the vertical moving member 29 may be realized by the function of the vertical moving motor 32, for example.
May be realized by the operation of the horizontal motion motor 33, for example. For example, the vertical movement motor 32 and the horizontal movement motor 33 may be composed of a servomotor or other drive source capable of controlling the rotation amount of the rotation shaft with a small rotation angle.

Moreover, the position of the movable mold 13 can be changed while changing its position on the above-mentioned moving plane. Such a change in the posture of the movable mold 13 can be achieved by a rotating member 35 having a rotating shaft 34 extending in a vertical direction or a swinging member 37 having a pair of swinging shafts 36 extending in a horizontal direction.
Is realized through the work of When the rotation shaft 34 is received in the support hole 38 formed in the vertically moving member 29, the rotation member 35 can rotate around the vertical axis. On the other hand, when the two swing shafts 36 are received in the support holes 39 formed in the rotating member 35, the swing member 37 can swing around the horizontal axis. The rotation of the rotating member 35 and the swinging of the swinging member 37 may be realized individually by the operation of a drive motor (not shown) constituted by, for example, a servomotor. Here, the swing center of the swing shaft 36 is the center shaft 22.
It is desirable to be orthogonal to the center of rotation of the rotation shaft 34 on the extension of.

FIG. 4 schematically shows the entire structure of a push-through bending system 41 in which the above-described push-through bending machine 10 is incorporated. In the push-through bending system 41, the operation of the push-through bending machine 10 is controlled by the NC controller 42. To realize this control, the NC controller 42 sets a three-dimensional mechanical coordinate system xyz for the push-through bending machine 10 as shown in FIG. 5, for example. This machine coordinate system xyz includes, for example, a z-coordinate axis overlapping the central axis 22 of the fixed mold 12,
An x-coordinate axis and y defining the horizontal direction and the vertical direction of the fixed mold 12 on one plane facing the exit of the through hole 24, respectively.
And coordinate axes.

It is desirable that the moving plane HV of the movable mold 13 be held in a posture parallel to the xy plane of the machine coordinate system xyz. According to the setting of the moving plane HV, the movable mold 1
The position of No. 3 can be easily specified by an x-coordinate value or a y-coordinate value specified according to the machine coordinate system xyz. At this time, the z coordinate value of the movable mold 13 may be specified based on a so-called approach distance, that is, a distance between the fixed mold 12 and the movable mold 13. This approach distance is kept constant regardless of the movement of the movable mold 13.

For example, the intersection of the moving plane HV of the movable mold 13 and an extension of the central axis 22 (z coordinate axis of the machine coordinate system xyz) can be set at the reference position of the movable mold 13. When the movable mold 13 is positioned at the reference position, the restraining force of the movable mold 13 along the movement plane HV is not applied to the profile 11 passing through the two through holes 24 and 28 one after another. That is, the straight section 11 goes straight, and at this time, the section 1
1 does not cause any bending deformation. When the reference position of the movable mold 13 is specified in this manner, the attitude of the movable mold 13 is changed to a rotation angle B around the y-axis (V axis) or a rotation angle A around the x-axis (H axis) specified according to the machine coordinate system xyz, for example. Can be identified by

Referring again to FIG. 4, the NC controller 42
Has an engineering workstation (EWS)
An NC processing program calculated by a computer device 43 such as a personal computer (PC) or the like is supplied. The NC processing program includes, for example, a long material 1
Control data such as the position and orientation of the movable die 13 associated with each of the one feed position is defined. When the x-coordinate value and the y-coordinate value of the movable mold 13 are designated according to the aforementioned machine coordinate system xyz, the NC controller 42 controls the horizontal motion motor 33 and the vertical motion motor 32 to establish such x-coordinate value and y-coordinate value. The drive command value for defining the rotation amount is pushed and output to the bending machine 10. When the rotation angle B around the y-axis and the rotation angle A around the x-axis of the movable mold 13 are specified according to the machine coordinate system xyz, the NC controller 42 controls the rotation of the rotation member 35 and the swing member 37 that establish these rotation angles. Pushing the drive command value of the drive motor to cause the bending machine 10
Output to.

The computer device 43 includes an N for realizing the control data creating method for a push-through bending machine according to the present invention.
C processing program creation software is incorporated. This NC processing program creation software is, for example, a CA that realizes a computer-aided design (CAD) system.
It can function as one module of D software (so-called add-on software). Thus CA
When incorporated in the D software, the NC machining program creation software can use existing functions incorporated in the CAD software in implementing the control data creation method. However, the NC machining program creation software does not necessarily need to be incorporated into the CAD software, and all necessary functions may be provided by the NC machining program creation software alone. NC machining program creation software
For example, the FD (Floppy Disk) 44, CD (Compact Disk) 45, DVD (Digital Video Disk), or other portable recording medium may
3 or may be incorporated in the computer device 43 via a network, whether wireless or wired.

In realizing the control data creating method for the push-through bending machine according to the present invention, the NC machining program creating software is a long-size machine through a network 46 such as a LAN (local communication network), WAN (wide area communication network), or the Internet. Get product shape data.
Using the acquired shape data, the NC machining program creation software creates the NC machining program as described above.

The shape data may be fetched from a product database constructed in the server computer 47, for example. In the product database, for example, CAD data of a product designed on the CAD terminal 48 may be stored.
Such CAD data is, for example, FD
(Floppy disk), CD (compact disk), DVD (digital video disk), and other portable recording media, and may be taken into the product database via the network 49 regardless of whether it is wireless or wired. Good.

Now, as shown in FIG. 6, for example, a long product 5 formed by bending and deforming a profile having a uniform cross section.
Suppose the scene where 1 was designed. The long product 51 designed on the CAD system is stored in the product database as CAD data. Such CAD data includes at least shape data representing the shape of the long product 51 according to a single global coordinate system XYZ. An expression method such as a wire frame model, a surface model, or a solid model may be used for the shape data. The shape data may specify the cross-sectional shape of the long product 51 and the degree of bending of the long product 51 associated with the cross-sectional shape in a single data structure, and such a cross-sectional shape and the degree of bending may be specified in a separate data structure. May be specified.

First, the operator starts up the NC machining program creation software on the computer device 43.
The NC machining program creation software fetches the shape data of the long product 51 from the product database based on the input operation of the operator. For example, a keyboard or a mouse may be used for the input operation. Based on the captured shape data, a long product 51 is displayed on the screen of the computer device 43.
Can be reproduced. For this reproduction, for example, an image processing function of CAD software may be used.

When the three-dimensional shape of the long product 51 is confirmed in this manner, the NC machining program creation software sets the three-dimensional shape of the long product 51 in the overall coordinate system XYZ for specifying the three-dimensional shape of the long product 51 as shown in FIG. , Push-through bending machine 1
A local coordinate system, that is, a machine coordinate system xyz specified based on the fixed type 12 of 0 is defined. Such a machine coordinate system xy
z may be set for each of the specific cross sections 52a to 52f of the long product 51. Details of a method for setting such a cross section will be described later. The machine coordinate system xyz is defined by the through holes 24 of the fixed mold 12.
Is associated with each of the cross sections 52a to 52f.

In associating the machine coordinate system xyz with each of the cross sections 52a to 52f, the NC machining program creation software obtains the positional relationship between the through hole 24 of the fixed die 12 and the machine coordinate system xyz. For example, G
A UI (graphical user interface) may be used. That is, the operator only has to align the machine coordinate system xyz with the cross-sectional shape of the long product 51 drawn on the screen of the computer device 43 as shown in FIG. 8, for example. At this time, the directions of the x-coordinate axis and the y-coordinate axis of the machine coordinate system xyz are set according to the shape of the through-hole 24 formed in the fixed die 12, that is, the direction around the central axis 22. The direction of the z coordinate axis is the center axis 2 of the fixed mold 12
Matches 2. The center axis 22 of the fixed mold 12 desirably coincides with, for example, the center of gravity position G specified by the cross-sectional shape of the long product 51.

When the position and posture of the fixed mold 12 are specified for each of the cross sections 52a to 52f of the long product 51 based on the machine coordinate system xyz, the position and posture of the movable mold 13 are determined based on the fixed mold 12. It can be read according to the coordinate system xyz. When reading the position of the movable die 13, the NC processing program creation software
A position vector related to the movable mold 13 is specified on the machine coordinate system xyz. Such a position vector is, for example, a first vector defined by the magnitude of the approach distance from the origin of the machine coordinate system xyz along the z-coordinate axis, and from the tip of this first vector parallel to the y-coordinate axis of the machine coordinate system xyz. What is necessary is just to specify by the combination of the prescribed | regulated 2nd vector and the 3rd vector prescribed | regulated from the front-end | tip of a 2nd vector in parallel with the x coordinate axis of machine coordinate system xyz.

For example, when the moving plane HV of the movable mold 13 is specified on the machine coordinate system xyz, the second vector and the third vector of the movable mold 13 are determined according to the cross-sectional shape of the long product 51 intersecting the moving plane HV. The size can be specified. As shown in FIG. 9, when the three-dimensional image of the long product 51 is projected on the yz plane of the machine coordinate system xyz,
Based on the intersection between the projected three-dimensional image and the moving plane HV, the magnitude of the second vector, that is, the y-coordinate value of the movable mold 13 can be specified. At this time, if the tangential direction 53 of the long product 51 is specified on the moving plane HV, the movable mold 13
Can be derived around the x-axis. FIG.
As shown in FIG. 0, when the three-dimensional image of the long product 51 is projected on the xz plane of the machine coordinate system xyz, the third vector is similarly set based on the intersection of the projected three-dimensional image and the moving plane HV. , That is, the x coordinate value of the movable mold 13 can be specified. At the same time, the long product 5 on the moving plane HV
If the tangent direction 54 of one is specified, the rotation angle B about the y-axis of the movable mold 13 can be derived. The horizontal motion motor 33 is controlled according to the specified x-coordinate value, and at the same time, the vertical motion motor 3 is controlled according to the specified y-coordinate value.
2 will be controlled.

Subsequently, the NC machining program creation software executes each of the cross sections 52a to 52a in which the machine coordinate system xyz is set.
The feed position of the long material 11 which is the material of the long product 51 is calculated every 2f. The feed position is determined by measuring each section 5 from the tip of the long product 51 measured along the longitudinal direction of the long product 51.
What is necessary is just to calculate based on the distance from 2a to 52f. Each of the calculated feed positions is associated with an x-coordinate value and a y-coordinate value of the movable die 13, a rotation angle B around the y-axis, and a rotation angle A around the x-axis. Thus, control data is created. When the description of the NC program header and the NC program footer is added to the control data, the NC machining program is completed, for example, as shown in FIG.

The completed NC machining program is finally N
It is supplied to the C controller 42. NC controller 4
2 operates the press-through bending machine 10 according to the NC machining program. According to the NC processing program shown in FIG. 11, the long material 11 has a constant feed speed P = 6000.
It passes through the fixed mold 12 and the movable mold 13 at mm / min.
For example, when the feed position W = −1424.0000 mm is established, the movable mold 13 moves the x coordinate value X = 0.000 mm and y from the reference position, that is, the origin position on the xy plane.
Move to the coordinate position specified by the coordinate value Y = 0.446 mm. At this time, the attitude of the movable mold 13 is such that the rotation angle B around the y-axis B = 0.000 degrees and the rotation angle A around the x-axis A = 0.159.
Specified in degrees. Subsequently, the long material 11 is moved to the feed position W = −1.
When the movable mold 13 reaches 504.072 mm, the x-coordinate value X = 0.000 mm and the y-coordinate value Y = 4.409.
Move to the coordinate position specified by mm. At this time, the posture of the movable mold 13 changes to the posture defined by the rotation angle B around the y-axis B = 0.000 degrees and the rotation angle A around the x-axis A = 3.157 degrees. Each time the movable die 13 passes through each feed position W, the movable mold 13 moves to the position defined by the x-coordinate value X and the y-coordinate value Y while rotating around the y-axis B and the x-axis rotation angle A.
Changes to the posture specified by. Between the adjacent feed positions W, the x-coordinate value X and the y-coordinate value Y, the rotation angle B around the y-axis, and the rotation angle A around the x-axis may change at a constant speed, for example. However, the feed position W here is defined along the z-coordinate axis with reference to the origin position of the slider 15. The origin position of the slider 15 refers to, for example, a position at which the slider 15 starts to advance in a press-through bending process or a standby position before the process.

As described above, according to the control data creating method according to the present invention, the position of the movable mold 13 is determined in accordance with the mechanical coordinate system xyz, that is, the local coordinate system specified on the basis of the fixed mold 12 of the push-in bending machine 10. Is done. Moreover, the local coordinate system is redefined each time the feed position defined in the longitudinal direction of the long product 51 changes. Therefore, after the bending deformation of the long product 51 formed between the fixed mold 12 and the movable mold 13 is necessarily incorporated, the x-coordinate value and the y-coordinate value of the movable mold 13 are specified. As a result, an ideal movement amount of the movable mold 13 can be obtained. Such an ideal amount of movement can greatly assist in performing bending deformation on the long material 11 as designed.

As described above, when determining the cross sections 52a to 52f associated with the machine coordinate system xyz, NC
As shown in FIG. 12, for example, the machining program creation software creates a long product 51 based on the aforementioned shape data.
Is specified at least one parametric curve 55 representing the degree of bending. Such a parametric curve 5
5 is a ridge line or a center of gravity line of the long product 51 reproduced by, for example, CAD software (a curve connecting the centers of gravity of the sections one after another).
May be directly specified, or may be newly created by the NC machining program creation software based on such a ridge line or a center of gravity line.

The parametric curve 55 can be represented by a representation method such as a Bezier curve, a B-spline curve, or a NURBS (non-uniform rational B-spline) curve. In such an expression method, for example, as shown in FIG.
8 can be defined. These control points 57 and 58 always include a knot 57 that gives a coordinate value on a curve 56 that is expressed. The arrangement of the knots 57 is determined on the basis of the difference between the straight line 59 connecting the adjacent knots 57 and the represented curve 56, that is, the tolerance TOL. As a result of keeping the tolerance TOL constant, the interval between the knots 57 is reduced in the curved portion 56 having a large curvature, and the interval between the knots 57 is increased in the curved portion 56 having a small curvature. Moreover, if the tolerance TOL increases, the interval between the knots 57 is increased, and the tolerance TOL is increased.
Becomes smaller, the interval between the knots 57 is reduced.

When the coordinate value of each knot 57 is specified on the parametric curve 55 in this way, as shown in FIG. 14, the NC machining program creation software applies a tangent vector 60 to the parametric curve 55 for each knot 57. Is calculated. As a result, in each knot 57, the cutting plane 61 at which the tangent vector 60 is orthogonal can be specified. Each cross section 52a to 52f can be specified by the cross-sectional shape of the long product 51 drawn on the cutting plane 61. Thus parametric curve 5
As a result of the use of No. 5, as the curvature of the long product 51 increases, the number of sections 52a to 52f increases, and the movement of the movable mold 13 can be finely controlled. In addition, if the size of the tolerance TOL is intentionally changed, the cross section 5 can be adjusted in accordance with the dimensional accuracy required for the long product 51.
The number of sheets 2a to 52f can be changed intentionally.

The parametric curve 55 can be used to calculate the position of the movable die 13 at each feed position W, that is, the amount of movement. For example, as described above, it is assumed that the machine coordinate system xyz is set in the cross sections 52a to 52f defined for each knot 57 of the parametric curve 55. At this time, the NC machining program creation software, for example, as shown in FIG. 15, the fixed mold 12 and the movable mold 13 on the machine coordinate system xyz.
Is specified. The approach distance L is measured along the center axis 22 of the fixed mold 12 between the exit of the fixed mold 12 side through-hole 24 and the movable mold 13 positioned at the reference position. Such an approach distance L may be previously taken into the NC machining program creation software through, for example, an input operation of the operator.

A moving plane HV of the movable mold 13 is defined on the machine coordinate system xyz based on the specified approach distance L. In defining the movement plane HV, the NC machining program creation software may define the z coordinate value on the machine coordinate system xyz based on the approach distance L. As a result, the xy plane of the machine coordinate system xyz is translated along the z coordinate axis by the approach distance L. When the moving plane HV is defined in this way, the NC machining program creation software calculates the x coordinate value and the y coordinate value at the intersection 63 between the moving plane HV and the parametric curve 55. Since the z-coordinate value is specified in advance by the approach distance L, the x-coordinate value and the y-coordinate value of the intersection 63 can be easily derived. The position of the movable mold 13 as described above can be specified by the calculated x-coordinate value and y-coordinate value.

As described above, when the z-coordinate axis of the machine coordinate system xyz overlaps the center axis 22 of the fixed mold 12, FIG.
As is clear from FIG. 5, the parametric curve 55 always indicates that the center axis 2 of the fixed mold 12
It is desirable that the two overlap. Such a parametric curve 55 passes through the center position of the fixed mold 12 at each of the cross sections 52 a to 52 f of the long product 51. Here, this parametric curve 55 is called a “neutral axis”. Such a neutral axis can be specified, for example, as follows.

For example, as shown in FIG. 16 and FIG. 17, two-dimensional data expressing the cross-sectional shape 65 of the long product 51 and three-dimensional data expressing the ridge line corresponding to each vertex of the cross-sectional shape 65 are individually separated. Assume a scene included in CAD data. However, in associating each vertex of the cross-sectional shape 65 with each ridge line, the chamfer formed at each vertex is ignored. That is, the ridge line is drawn by the vertex before the cornering used in the drawing process of the cross-sectional shape 65.

The NC machining program creation software is
First, the correspondence between each vertex of the cross-sectional shape 65 specified by the two-dimensional data and the ridge line specified by the three-dimensional data is acquired. For this acquisition, for example, a GUI may be used.
That is, the operator designates the first and second guide lines 66a and 66b based on the three-dimensional image of the ridge line drawn on the screen of the computer device 43 as shown in FIG. As shown in (1), for example, the first and second guide points 67a and 67b are designated based on the cross-sectional shape 65 drawn on the screen. Here, the first guide line 66a and the first guide point 67a are associated with each other, and the second guide line 66b and the second guide point 67b are associated with each other in accordance with the designated order. For such designation, for example, a mouse operation may be used.

When the two-dimensional data and the three-dimensional data are associated with each other, the NC machining program creation software acquires the positional relationship between the two guide points 67a and 67b and the center position 68 of the fixed mold 12. For this acquisition, for example, a GUI may be used. That is, the operator only has to superimpose the xy coordinate system on the cross-sectional shape 65 of the long product 51 drawn on the screen of the computer device 43 as shown in FIG. At this time, the operator matches the coordinate origin (0, 0) of the xy coordinate system with the center position 68 of the fixed mold 12. The direction of the xy coordinate system may be specified according to the aforementioned machine coordinate system xyz. When the xy coordinate system is set in this way, the NC machining program creation software calculates the x and y coordinate values of the first and second guide points 67a and 67b according to the xy coordinate system.

Subsequently, as shown in FIG. 18, the NC machining program creation software executes two ridge lines defined by the three-dimensional data, ie, first and second guide lines 66.
A plurality of cutting planes 70a to 70f are defined for a and 66b. In setting the cutting planes 70a to 70f, the first and second guide lines 66a and 66b may be equally divided into the same number of partial lines. Each cutting plane 70a
70f are orthogonal to the tangents of the first and second guide lines 66a and 66b at the division points 71a to 71f of the partial line. In each of the cutting planes 70a to 70f, the first guide point 6 is set at a position where the first guide line 66a intersects with the cutting planes 70a to 70f.
7a can be specified, and the second guide point 67b can be specified at the position where the second guide line 66b intersects the cutting planes 70a to 70f.

When the positions of the first and second guide points 67a and 67b are specified on each of the cutting planes 70a to 70f in this way, the NC machining program creation software fixes the two guide points 67a and 67b as described above. Based on the positional relationship between the center position 68 of the mold 12 and the cutting planes 70a to 70
The center position 68 is specified on 0f. When the calculated center positions 68 are connected in order, the above-described parametric curve 55 can be drawn.

In connecting the center positions 68 in order, N
The C processing program creation software may refer to the first guide line 66a represented by, for example, a parametric curve. The NC processing program creation software firstly sets the first guide line 66a on each of the cutting planes 70a to 70f.
Specify the direction vector of. These direction vectors are translated to the center position 68. As a result, a start point vector and an end point vector are specified between two adjacent cutting planes 70a to 70f. A parametric curve of the same order as the first guide line 68a is drawn between the start point vector and the end point vector specified in this way. The curvature of the parametric curve can be changed from the start point vector to the end point vector at an equal change rate. As a result of such parametric curves being drawn one after another, a smooth and highly accurate neutral axis is obtained. In addition, in order to improve the accuracy of the parametric curve obtained in this way, it is desirable to reduce the interval between the dividing points 71a to 71f, that is, the interval between the cutting planes 70a to 70f.

In the push-through bending machine 10, in addition to the above-described bending deformation, a torsional deformation may be realized at the same time. Such torsional deformation may be realized by rotation of the pendulum member 19. At this time, the NC processing program supplied to the NC controller 42 includes the pendulum member 19 associated with each feed position of the long material 11 as described above.
It is only necessary to include control data such as the rotational position of. NC
The controller 42 pushes a drive command value that defines a rotation amount of the drive motor 23 that establishes such a rotation position, and outputs the drive command value to the bending machine 10.

[0057]

As described above, according to the present invention, it is possible to realize the ideal movement of the movable mold while reflecting the bending deformation of the long product formed between the fixed mold and the movable mold. .

[Brief description of the drawings]

FIG. 1 is a side view schematically showing an entire configuration of a push-through bending machine.

FIG. 2 is an enlarged front view of a fixed type.

FIG. 3 is an enlarged front view of a movable type.

FIG. 4 is a schematic diagram schematically showing an entire configuration of a push-through bending system.

FIG. 5 is a perspective view of a fixed type illustrating a concept of a machine coordinate system.

FIG. 6 is a perspective view schematically showing a configuration of a long product.

FIG. 7 is a perspective view showing a machine coordinate system associated with each section of the long product.

FIG. 8 is a diagram schematically showing a GUI (graphical user interface) used for setting the orientation of a machine coordinate system with respect to a cross section.

FIG. 9 is a conceptual diagram showing a process of calculating a y-coordinate value from a long product projected on a yz plane.

FIG. 10 is a conceptual diagram showing a process of calculating an x coordinate value from a long product projected on an xz plane.

FIG. 11 is a diagram showing a specific example of an NC machining program.

FIG. 12 is a conceptual diagram showing a parametric curve expressing the degree of bending of a long product.

FIG. 13 is a conceptual diagram showing control points specified by a parametric curve.

FIG. 14 is a conceptual diagram showing a cross section of a long product specified based on a parametric curve.

FIG. 15 is a conceptual diagram showing a position of a movable die specified based on a parametric curve.

FIG. 16 is a plan view showing a cross-sectional shape of a long product represented by two-dimensional data.

FIG. 17 is a conceptual diagram showing a ridge line of a long product represented by three-dimensional data.

FIG. 18 is a conceptual diagram showing a neutral axis specified based on two guide lines.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Push-through bending machine, 12 fixed type, 13 movable type, 44 Floppy disk (F
D), 45 Compact disk as recording medium (C
D), 51 long products, 52a-52f cross section of long products, 55 parametric curves, 57 knots as control points, 60 tangent vectors, 63 intersections, HV movable movable plane, L approach distance.

[Procedure amendment]

[Submission date] August 29, 2000 (2008.2.
9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0042

[Correction method] Change

[Correction contents]

The completed NC machining program is finally N
It is supplied to the C controller 42. NC controller 4
2 operates the press-through bending machine 10 according to the NC machining program. According to the NC machining program shown in FIG. 11, the long material 11 has a constant feed speed F = 6000.
It passes through the fixed mold 12 and the movable mold 13 at mm / min.
For example, when the feed position W = −1424.0000 mm is established, the movable mold 13 moves the x coordinate value X = 0.000 mm and y from the reference position, that is, the origin position on the xy plane.
Move to the coordinate position specified by the coordinate value Y = 0.446 mm. At this time, the attitude of the movable mold 13 is such that the rotation angle B around the y-axis B = 0.000 degrees and the rotation angle A around the x-axis A = 0.159.
Specified in degrees. Subsequently, the long material 11 is moved to the feed position W = −1.
When the movable mold 13 reaches 504.072 mm, the x-coordinate value X = 0.000 mm and the y-coordinate value Y = 4.409.
Move to the coordinate position specified by mm. At this time, the posture of the movable mold 13 changes to the posture defined by the rotation angle B around the y-axis B = 0.000 degrees and the rotation angle A around the x-axis A = 3.157 degrees. Each time the movable die 13 passes through each feed position W, the movable mold 13 moves to the position defined by the x-coordinate value X and the y-coordinate value Y while rotating around the y-axis B and the x-axis rotation angle A.
Changes to the posture specified by. Between the adjacent feed positions W, the x-coordinate value X and the y-coordinate value Y, the rotation angle B around the y-axis, and the rotation angle A around the x-axis may change at a constant speed, for example. However, the feed position W here is defined along the z-coordinate axis with reference to the origin position of the slider 15. The origin position of the slider 15 refers to, for example, a position at which the slider 15 starts to advance in a press-through bending process or a standby position before the process.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0055

[Correction method] Change

[Correction contents]

In connecting the center positions 68 in order, N
The C processing program creation software may refer to the first guide line 66a represented by, for example, a parametric curve. The NC processing program creation software firstly sets the first guide line 66a on each of the cutting planes 70a to 70f.
Specify the direction vector of. These direction vectors are translated to the center position 68. As a result, a start point vector and an end point vector are specified between two adjacent cutting planes 70a to 70f. Thus parametric curve of the same order as the first guide line 6 6 a between the specified start vector and end vector is portrayed. The curvature of the parametric curve can be changed from the start point vector to the end point vector at an equal change rate. As a result of such parametric curves being drawn one after another, a smooth and highly accurate neutral axis is obtained. In addition, in order to improve the accuracy of the parametric curve obtained in this way, it is desirable to reduce the interval between the dividing points 71a to 71f, that is, the interval between the cutting planes 70a to 70f.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideo Miwa 1-10-1 Shinsayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd. (72) Yoshihiro Kageyama 1-10-1 Shinsayama, Sayama City, Saitama Honda Engineering Co., Ltd. F term (reference) 4E063 AA11 BC10 BC30 LA02 LA04 LA17 LA19

Claims (10)

[Claims] 1. A step of obtaining shape data representing the shape of a long product in accordance with a general coordinate system, and a local product coordinate system specified on the basis of a fixed type of a push-through bending machine based on the shape data. And a step of calculating the position of the movable die of the push-through bending machine based on the local coordinate system. 2. The method for producing control data for a push-through bending machine according to claim 1, wherein at least one of the bending data of the long product is expressed based on the shape data.
Specifying the parametric curve of the book, calculating a tangent vector to the parametric curve for each control point specified on the parametric curve, and calculating the cross section for each control point of the parametric curve based on the calculated tangent vector. And a method for creating control data for a push-through bending machine. 3. The method according to claim 2, wherein, when calculating the position of the movable die, an approach distance between the fixed die and the movable die on the local coordinate system. A step of specifying a movable moving plane on the local coordinate system based on the specified approach distance, and a step of specifying an intersection of the moving plane and the parametric curve on the local coordinate system. A method for creating control data for a push-through bending machine, further comprising: 4. A step of obtaining shape data representing the shape of a long product according to the entire coordinate system, and a local product coordinate system specified on the basis of a fixed type of a push-through bending machine based on the shape data. A computer-readable recording medium storing a program for causing a computer to perform a step of setting for each cross-section and a step of calculating a position of a movable die of a push-through bending machine based on a local coordinate system. 5. A control data for a push-through bending machine, wherein a local coordinate system specified on the basis of a fixed type of the push-through bending machine is defined in an overall coordinate system for specifying a shape of a long product. Method. 6. The method according to claim 5, wherein the local coordinate system is redefined for each feed position defined in a longitudinal direction of the long product. Method for creating control data for push-through bending machines. 7. A computer-readable program storing a program for causing a computer to execute a step of defining a local coordinate system specified on the basis of a fixed type of a push-through bending machine in an overall coordinate system specifying the shape of a long product. Recording medium. 8. A step of acquiring shape data of a long product from a computer-aided design system, and, based on the acquired shape data, a movable die of a press-through bending machine at each feed position defined in a longitudinal direction of the long product. Generating control data for specifying the position of the punching bending machine. 9. The method according to claim 8, wherein the shape data defines at least one curve representing a degree of bending of the long product. Control data creation method for push-through bending machine. 10. A step of acquiring shape data of a long product from a computer-aided design system, and, based on the acquired shape data, a movable type of a push-through bending machine for each feed position defined in the longitudinal direction of the long product. And a step of generating control data for specifying a position of the computer.