JPH0589210A - Cad/cam device - Google Patents

Abstract

PURPOSE:To perform metallic mold design considering a draft without requiring correction by a person in a short time by applying deformation to all kinds of shape in which an endpoint is put on a draft line provided in shape to be worked so as to be continued by interlocking. CONSTITUTION:The draft line 8a is deformed to a line segment 11a rotated by a draft angle centering a fixed point 10, and the line segment 11a in which the endpoint is put on the draft line 8a is deformed to a line segment 11c in which an intersection with the draft line 8b after deformation is set as the endpoint by a neighboring line segment deforming means. In addition to such processing, a tangential circular arc in which the endpoint is put on the draft line 8b is deformed to a circular arc 12c which keeps neighboring relation with the draft line by a neighboring tangential circular arc deforming means. Also, the circular arc not coming in contact with the draft line is moved in the direction 9 of reference line and is deformed. In such a way, the intersection of a deformed draft line 8b with the line segments 11a, 13a is calculated, and the point is set as each endpoint. Thereby, it is possible to obtain continuous shape like the draft line 8c and the neighboring line segments 11c, 13c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CAD / CAM apparatus, and more specifically, a CAD / CA for designing a mold used for plastic molding by deforming a shape to be processed.
It relates to the M device.

[0002]

2. Description of the Related Art When designing a mold used for plastic molding, in order to make it easy to remove the molded product from the mold,
The draft that can be applied in the pulling direction is called draft. Deformation of the shape to be processed by the draft amount is called draft deformation.

FIG. 12 is a block diagram showing an example of a conventional CAD / CAM device for designing a mold by the above-mentioned draft modification. The conventional operation will be described below together with the system configuration of the general CAD / CAM device shown in FIG.

In the CAD / CAM device 51, when the information of the working drawing is input by the information input unit 2, the working drawing is displayed on the display unit 6. Therefore, FIG. 14 (a)
The line segment 8a included in the processing drawing displayed as shown in (c) and (c) is selected by the mouse 25 or the like. Next, the mouse 25 is used to specify the fixed point 10 which is the center when the line segment 8a is rotationally moved. Then, the deformation direction is determined by designating the arbitrary point D with the mouse 25 as to which side the line segment is rotated around the fixed point 10. Next, the draft angle is input.

Information input through the information input section 2 is stored in the information storage section 53. Information analysis unit 54
Performs the draft deformation of the line segment 8a by the process shown in the flowchart of FIG. 13 based on the input information.

That is, as shown in FIGS. 14 (b) and 14 (d), the draft line 8a is rotated about the fixed point 10 in the indicated direction by θ to obtain the transformed draft line 8b. (S51). The information display control unit 5 displays the processed shape obtained by this draft deformation on the display unit 6.

In the process shown in FIG. 13, the process shown in FIG.
As for the continuous line segment 29a in which the end points of the elements are on the draft line as shown in (b), the intersection point with the deformed draft line 8b is calculated, and the line segment 29b and the draft line 8b are calculated.
The end point of is the intersection (S52). However, in FIG.
As shown in (d), when the continuous shape is the circular arc 30, only the draft line 8b is deformed, so that it is not continuous. Therefore, for an arc having an end point on the draft line, such as the arc 30, parallel movement is performed using another function of CAD so that the continuity can be maintained after the draft deformation, and the intersection point is used as the end point. Etc., the arc was corrected.

In addition, there is a "CAD / CAM device" disclosed in Japanese Patent Laid-Open No. 1-291375 as a reference technical document related to the present invention.

[0009]

Conventional CAD / CAM
In the device, as described above, the arc whose endpoints are on the draft line is subjected to draft deformation and then maintains continuity.
It is necessary to manually correct the continuous arc using another CAD function. Further, after the draft modification is performed and the above-mentioned continuity correction is performed, when the draft angle is changed, it is necessary to again perform the draft modification and the continuity correction of the related arcs. For this reason, there is a problem that the correction work becomes complicated and time-consuming as the number of times of the draft deformation is increased. In addition, there is a problem in that correction omissions and correction errors occur.

The present invention has been made in order to solve the above-mentioned problems, and does not require any complicated manual arc correction work, and the work is duplicated when the draft angle is changed later. CA that makes it possible to design a mold that has been subjected to draft deformation without difficulty
The purpose is to obtain a D / CAM device.

[0011]

Means for Solving the Problems C according to the first invention
The AD / CAM device is a CAD / CAM device for designing a mold used for plastic molding. When the angle (draft angle) at which a molded product can be easily taken out from the mold is θ, a draft line is drawn. (Draft line) is rotated by θ around the intersection (fixed point) with another line (reference line) that is not parallel to the draft line that is the deformation reference, and the draft angle is tilted. Obtaining a slope line When transforming a draft line, a line segment whose endpoint is on the draft line calculates the intersection with the draft line that is inclined by the draft angle, and uses that intersection as the end point. The adjoining line segment deforming means that obtains, and the arc that has an end point on the draft line and is in contact with each other, fixes the radius of the arc and keeps the state of contact with the draft line, and To maintain the relationship with adjacent graphic elements And an adjoining arc deformation means for moving the center point of the arc to obtain the arc.

In the CAD / CAM device according to the second aspect of the present invention, among the arcs having the end points on the draft line, those that do not contact the draft line (adjacent arcs that do not touch) are drawn from the fixed point to the draft line. When the distance to the end point of the adjacent circular arc that does not touch the vehicle is d, the radius of the circular arc is fixed and the central point is moved by d · tan θ in the reference line direction. Two means: an adjoining arc deforming means, an adjoining arc which is not in contact with the adjoining arc, and an adjoining arc deforming means in an intersection cut mode for calculating an intersection of a draft line inclined by a draft angle and obtaining an arc having the intersection as an end point. A mode-designated adjacent circular arc deforming means for changing by changing the mode is added.

In the CAD / CAM apparatus according to the third aspect of the present invention, among the shapes to be machined, the draft line inclined by the draft angle by the adjacent line segment deforming means is fixed to the reference line set at the time of deformation and fixed. The draft angle is edited by storing necessary information at the time of changing the draft angle such as points, draft angle, the parallel movement mode and the intersection cut mode.

[0014]

In the CAD / CAM device according to the first aspect of the present invention, the draft line is transformed into a line segment rotated by the draft angle about the fixed point, and the line segment whose end point is on the draft line is In addition to the conventional processing in which the adjacent line segment deforming means transforms the segment into a line segment whose end point is the intersection with the deformed draft line, the tangential arc whose endpoint lies on the draft line is adjacent arc transforming means. Is transformed into an arc that maintains the adjacent relationship with the draft line.

In the CAD / CAM device according to the second aspect of the present invention, among the arcs whose end points are on the draft line, those that do not contact the draft line are used as a reference when the deformation mode is the parallel movement mode. When the deformation mode is the intersection cut mode, the arc is transformed so that the intersection with the draft line after the deformation becomes the end point of the arc.

In the CAD / CAM apparatus according to the third aspect of the present invention, when the draft angle is re-input, deformation is performed without specifying the reference line and the deformation direction.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a CAD / CA according to an embodiment of the present invention.
3 is a block diagram showing a configuration of an M device 1. FIG. This CAD /
The CAM device 1 includes an information input unit 2 for inputting information, and an information storage unit 3 for storing information input from the information input unit 2.
An information analysis unit 4 that analyzes the information stored in the information storage unit 3, an information display control unit 5 that controls the display of the information analyzed by the information analysis unit 4, and an information display control unit 5 Display unit 6 whose display operation is controlled by.

Next, the operation of the modification shown in FIG. 4 will be described with reference to the flow charts shown in FIGS. The shape to be deformed included in the processed drawing displayed on the display unit 6 is extracted (S1). For example, the deformation target element included in the displayed processed drawing is extracted by surrounding it with a quadrangle 7 (generated by hitting two points A and B with the mouse 25) as shown in FIG.

Next, the draft line 8a in the element 7 to be deformed
Is designated (S2). For example, when the draft line 8a is designated, an arbitrary point C on this line segment is selected by hitting it with the mouse 25.

Next, it is judged whether or not the designated draft line 8a has already been drafted (S3), and the designated draft line 8a has already been drafted. If so, the draft angle is input (S4). This determination is performed depending on whether or not the editing data set in step S10 is added to the draft line 8a. On the contrary, if the designated draft line 8a is a line segment with no draft, the draft line 8a is drawn from the machining drawing.
A reference line 9 that is not parallel to is designated (S5). Here, the intersection of the selected reference line 9 and the draft line 8a is calculated by the information analysis unit 4, and that point is set as the fixed point 10.

Next, the information input unit 2 inputs the draft angle using the keyboard 24 or the like (S6).
In order to determine which side the draft line 8a is to be rotated about the fixed point 10, the deformation direction is designated (S
7). For example, when the arbitrary point D on the left side of the draft line 8a is hit by the mouse 25, the draft line 8a rotates clockwise around the fixed point 10, and conversely, the arbitrary point D is on the right side. If so, it shall rotate counterclockwise. The above input information is stored in the information storage unit 3.

Next, the information analysis unit 4 performs the same draft modification as shown in FIG. 14 (S8). Next, the shape inside the deformation target element 7 having the end points on the draft line is deformed (S9). A detailed description of this process is the flowchart shown in FIG.

Among the elements in the deformation target element 7, the element whose end point is on the draft line 8a is selected as the information analysis unit 4
To search (S12). Then, when the searched element is a line segment, the process proceeds to step S13, when it is an arc in contact with the draft line, the process proceeds to step S14, and when it is any other arc, the process proceeds to step S15. In the example of FIG. 4A, a shape having an end point on the draft line is a line segment, and thus the process proceeds to step S13.

As shown in FIG. 4B, the intersection of the deformed draft line 8b and the line segment 11a is calculated by the information analysis unit 4, and each of the deformed draft line 8b and the line segment 11a is calculated. The end point is set (S13). As a result, a continuous shape such as the draft line 8c and the adjacent line segment 11c shown in FIG. 4C is obtained.

Next, the reference line 9, the fixed point 10, the draft angle, the arc deformation mode set in step S15, etc.
Information necessary when changing the draft angle is stored in association with the draft line after the draft deformation (S10). Here, the draft angle is corrected and stored as a draft angle with positive and negative signs according to the direction in which the draft line rotates about the fixed point. Then, the information display control unit 5 displays the obtained deformed shape on the display unit 6 (S11).

Next, the deformation of the circular arc which is in contact with the draft line whose end points are on the draft line as shown in FIG. 5 will be described. Since steps S1 to S9 and step S11 shown in the flowchart of FIG. 2 are the same as those of the modification of FIG. 4, the description thereof will be omitted. Here, step S10 will be described with reference to the flowchart of FIG.

At step S12 shown in FIG.
In the example shown in (a) to (c), the process proceeds to step S14. Here, the tangential arc 12a has the same radius by the information analysis unit 4, contacts the deformed draft line 8b, and moves its center in parallel so as to maintain the relationship with another adjacent figure 13a.
Then, step S1 is performed so that the draft line 8b, the tangent arc 12b, and the other adjacent figures 13a of the tangent arc are continuous.
As shown in 3, the intersection of each shape is calculated by the information analysis unit 4,
The end point of each shape is changed to this intersection (S14). As a result, a continuous shape such as the draft line 8c, the adjacent arc 12c, and another adjacent figure 13c of the tangent arc is obtained.

Next, the deformation of an arc whose end points are on the draft line as shown in FIG. 6 and which is not in contact with the draft line will be described. Step S1 shown in the flowchart of FIG.
Since steps S9 to S11 are the same as those in the modification of FIG. 4, the description thereof will be omitted. Here, step S10 will be described with reference to the flowchart of FIG.

In step S12 shown in FIG. 3, in the example shown in FIG. 6, the process proceeds to step S15. Here, the information input section 2 inputs (designates) the arc deformation mode (S15). For example, as shown in FIG. 7, the mode is designated from the side menu displayed on the display unit 6. The specified arc deformation mode is stored in the information storage unit 3. Next, it is judged what the input arc deformation mode is (S16), the process proceeds to step S17 in the parallel movement mode, and proceeds to step S18 in the intersection cut mode.

Next, when it is judged to be in the parallel movement mode, the circular arc 14a having an end point on the draft line 8a in FIG. 6A is moved in a direction parallel to the reference line 9 (S17).
That is, as shown in FIG. 8, when the distance from the fixed point 10 to the end point of the arc 14a on the draft line is d and the draft angle is θ so that the radius of the arc 14a and the length of the chord are not changed, The center of the circular arc 14a is d in the direction parallel to the reference line 9.
・ Move by tan θ. Then, the draft line 8b, the circular arc 14b, and another adjacent figure 15a of the circular arc in FIG. 6B.
The information analysis unit 4 calculates the intersections of the shapes and changes the end points of the shapes so that the shapes become continuous. As a result, the draft line 8c deformed in the parallel movement mode as shown in FIG. 6C, the circular arc 14c, and another adjacent figure 15 of the circular arc.
A continuous shape of c is obtained.

Next, when it is judged that the intersection cut mode is set, this is set so as not to affect other adjacent figures 15a of the arc 14a having an end point on the draft line 8a of FIG. 6 (a). The arc 14a is deformed. That is, FIG.
The intersection of these two shapes is calculated by the information analysis unit 4 so that the deformed draft line 8b and the circular arc 14a in (d) are continuous, and the end points of each shape are changed (S18). As a result, the draft line 8e deformed in the intersection cut mode of FIG. 6 (e), the circular arc 14e, and another adjacent figure 15a of the circular arc.
A continuous shape of is obtained.

Next, the editing of the draft deformation will be described. The solid line shape in FIG. 9A is obtained by performing the draft deformation by setting the broken line shape by the above method, setting the draft angle at θ1, and setting the arc deformation mode to the parallel movement mode. With respect to this shape, the draft angle is changed to θ2, as shown in FIG.
A process for obtaining the solid line shape shown in (b) will be described.

Step S shown in the flow chart of FIG.
About 1 is the same as the above-mentioned draft modification. Also in step S2, the draft line 8c to be changed is designated as in the case of the deformation. In step S3, since the editing information is added to the draft line 8c, the process proceeds to step S4. In step S4, the angle θ2 from the shape before the draft deformation is input.

Of the information added to the draft line 8c, the reference line 9, the fixed point 10, and the arc deformation mode are stored in the information storage unit 3 as they are. The deformation direction is determined by whether the draft angle information added to the draft line 8a is positive or negative, and is stored in the information storage unit 3. As for the draft angle, (θ2-θ1) is stored in the information storage unit 3 as shown in FIG. 9B. The operation after step S8 is the same as that in the case of the above-mentioned draft deformation, and therefore its explanation is omitted.

Next, a second embodiment will be described. In FIGS. 4, 5, and 6 in the first embodiment, an example is shown in which there is one end point on the draft line, but as shown in FIG. 8a has a plurality of shapes with end points (16a, 17a, 1a in the example of FIG. 10).
8a), the deformation result shown in FIG. 10B is obtained by repeatedly executing step S9 shown in FIG. 2 for the number of shapes having the end points.

A general system configuration of the CAD / CAM device is shown in FIG. This CAD
The / CAM device includes a CPU 19 that executes various arithmetic processes on shape information, and a memory 20 that stores various information.
A printer 21 for recording shapes and characters, a paper tape input / output device 22 for punching various information on a paper tape and reading various information from the punched paper tape, and a CRT display 23 for displaying shapes and characters, A keyboard 24 for inputting information, a mouse (or tablet) 25 for inputting information necessary for drawing on the CRT display 23, and an auxiliary memory for writing information to be saved and reading the saved information It is composed of a device 26 and a bus 27 connecting all of these components.

[0037]

According to the CAD / CAM apparatus of the present invention, the shape having the end points on the draft line is made continuous by interlocking with each other by performing the draft deformation on the shape to be processed. Deform. Further, when the draft angle is changed after the draft transformation, the draft line is selected, the deformation is re-executed including the related shape only by inputting a new draft angle. Therefore, it is possible to design the die in consideration of the draft in a short time without requiring manual correction.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a CAD / CAM device according to the present invention.

FIG. 2 is a flowchart showing an operation of the CAD / CAM device shown in FIG.

FIG. 3 is a flowchart showing a related shape correction processing operation of the CAD / CAM apparatus shown in FIG.

FIG. 4 is an explanatory diagram showing a draft line by the CAD / CAM device shown in FIG. 1 and a draft deformation of continuous line segments.

5 is an explanatory diagram showing a draft line formed by the CAD / CAM device shown in FIG. 1 and a draft deformation of continuous tangential arcs.

FIG. 6 is an explanatory diagram showing a draft line of the CAD / CAM device shown in FIG. 1 and a draft deformation of an arc that is not in contact with the draft line.

7 is an explanatory diagram showing an information input unit of the CAD / CAM device shown in FIG.

8A and 8B are explanatory views showing a draft deformation in a parallel movement mode of a circular arc which is not in contact with the CAD / CAM device shown in FIG.

9A and 9B are explanatory diagrams showing deformation at the time of re-input of the draft angle after the draft deformation by the CAD / CAM device shown in FIG.

10 is an explanatory diagram showing a draft line by the CAD / CAM device shown in FIG. 1 and draft deformation of a plurality of following shapes.

FIG. 11 is an explanatory diagram showing a system configuration of a general CAD / CAM device.

FIG. 12 is an explanatory diagram showing a schematic configuration of a conventional CAD / CAM device.

FIG. 13 is a flowchart showing a draft deformation operation in a conventional CAD / CAM device.

FIG. 14 is an explanatory diagram showing draft deformation by a conventional CAD / CAM device.

[Explanation of symbols]

 1 CAD / CAM device 2 Information input unit 3 Information storage unit 4 Information analysis unit 5 Information display control unit 6 Display unit 7 Deformation target range 8a Draft slope line before deformation 9 Reference line 10 Fixed point D Deformation direction

[Procedure amendment]

[Submission date] December 25, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 3

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

[0013] The third invention CAD / CAM apparatus according to, among the processed shape, the the draft line draft-ray beam by the inclination gradient angle punching More deformation, set reference lines during deformation, fixed The draft angle is edited by storing necessary information at the time of changing the draft angle such as points, draft angle, the parallel movement mode and the intersection cut mode.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yutaka Tanaka, 5-14 Yanda Minami 5-chome, Higashi-ku, Nagoya City Mitsubishi Electric Corporation Nagoya Works

Claims (3)

[Claims] 1. A CAD / CAM device for designing a mold used for plastic molding, wherein a line that creates a draft is defined when the angle (draft angle) at which a molded product is easily taken out from the mold is θ. Draft line)
Draft line that obtains a draft line that is inclined by the draft angle by rotating by θ about the intersection (fixed point) with another line (reference line) that is not parallel to the draft line that is the basis of deformation When transforming, the line segment whose end point is on the draft line calculates an intersection with the draft line inclined by the draft angle, and obtains a line segment whose end point is the intersection. And an arc that has an end point on the draft line and is in contact with it, keep the radius of the arc fixed and keep it in contact with the draft line, and the relationship with other adjacent graphic elements. CA, an adjacent arc deforming means for moving the center point of the arc to obtain the arc.
D / CAM device. 2. Among the arcs whose end points exist on the draft line, those that do not touch the draft line (adjacent arcs that do not touch) are the adjacent arcs that do not touch the draft line from the fixed point. When the distance to the end point is d, the radius of the arc is fixed and the center point is d · tan θ in the reference line direction.
An intersection cut that obtains an arc whose end point is the intersection of the adjacent arc deformation means in the parallel movement mode, the adjacent arc that does not touch, and the draft line inclined by the draft angle 2. The CAD / CAM apparatus according to claim 1, further comprising a mode-designating adjacent arc deforming means for changing two means, i.e., an adjacent arc deforming means depending on a mode, by switching modes. 3. A reference line, a fixed point, a draft angle, and the parallel movement mode, which are set at the time of transformation, on a draft line inclined by a draft angle by the adjacent line segment deforming means among the shapes to be processed. 2. The CA according to claim 1, wherein the draft angle is edited by storing information necessary for changing the draft angle such as the intersection cut mode.
D / CAM device.