JP2570908B2 - CAD / CAM equipment - Google Patents

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 particularly, to a CAD / CAM apparatus which deforms a shape to be processed and designs an electrode shape for die-sinking electric discharge machining.

[0002]

2. Description of the Related Art In die-sinking electrical discharge machining, a workpiece is machined while slightly shaking an electrode having a shape similar to the shape of the workpiece. For this reason, the electrode shape is designed by deforming the shape to be processed by the swing amount. This deformation is called swing deformation.

FIG. 9 is a conceptual diagram showing an example of a conventional CAD / CAM apparatus for designing an electrode shape for die-sinking electric discharge machining by such swing deformation. In the CAD / CAM device (51), when information of a processing drawing is input by the information input section (2), the processing drawing is displayed on the display section (6). Therefore, the shape to be processed included in the displayed processed drawing is selected by a mouse or the like. Next, a deformation direction is designated by designating one graphic element (line segment or arc) of the shape to be processed and which side of the graphic element is the processing side.

[0004] Next, the swing amount is input. These pieces of input information are stored in the information storage unit ( 3 ). The information analysis unit (54) performs the swing deformation by the processing shown in FIG. 10 based on the input information.

In step (S51), a swing deformation is performed on a line segment among graphic elements constituting the workpiece shape. That is, as shown in FIG. 11, when the angle between the line segment and the Y axis is θ and the amount of swing is d, the line segment (dotted line) is moved by {d · cos θ} in the X axis direction of the deformation direction, Next, a line segment (solid line) after deformation is obtained by moving by {d · sin θ} in the Y-axis direction of the deformation direction.

In step (S52), swing deformation is performed on an arc of a graphic element constituting the shape to be processed. That is, as shown in FIG. 12A, if the deformation direction is inside the arc, the radius is reduced by the swing amount d while the center of the arc (dotted line) is fixed, and the deformed arc (solid line) Get) Further, as shown in FIG. 12B, if the deformation direction is outside the arc, the radius is increased by the swing amount d while the center of the arc (dotted line) is fixed, and the deformed arc (solid line) Get.

FIG. 13 illustrates a shape to be processed (broken line) and an electrode shape (solid line) obtained by oscillating the shape.
The electrode shape obtained by the swing deformation is displayed on the display unit (6) by the information display control unit (5).

By the way, there are an arc-shaped pattern and a radial pattern as a pattern for swinging the electrode. Processing using an arc-shaped pattern is called a circular mode, and processing using a radial pattern is called a radiation mode. The electrode shape obtained by the processing of FIG. 10 can be used as it is as the shape of the electrode for the circular mode.

However, in the radiation mode, the shape of the arc of the electrode is completely transferred to the workpiece. Therefore, using the electrode shape obtained by the processing of FIG. Can not. Therefore, FIG.
Of the corner arc of the electrode shape obtained by the above process, the radius of the corner arc is corrected to the radius of the corner arc of the shape to be processed.

[0010]

SUMMARY OF THE INVENTION Conventional CAD / CAM
In the device, when designing the electrode shape for the radiation mode, C
It is necessary to manually correct the corner arc using the AD function. Therefore, as the number of corner arcs increases, the correction operation becomes more complicated and takes longer time. Further, there is a problem that a correction omission or a correction error occurs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a CAD / CA system which can easily and quickly design an electrode for a radiation mode without performing a complicated manual operation.
M device.

[0012]

SUMMARY OF THE INVENTION The present invention relates to a CAD / CAM apparatus for designing an electrode shape for die-sinking electric discharge machining. Is a line segment among the graphic elements constituting the angle d, the angle between the line segment and the Y axis is θ, and d is
A line segment generating means for moving the line segment by d · sin θ in the cos θ and Y axis directions to obtain a line segment forming the electrode shape;
An arc generating means for fixing the center of the arc and changing the radius by the swing amount d to obtain an arc constituting the electrode shape, and for a corner arc of the graphic element, fixing the radius of the corner arc. And a corner arc generating means for moving a center so as to be continuous with an adjacent graphic element to obtain a corner arc forming an electrode shape.

[0013]

In the CAD / CAM apparatus according to the present invention, as for the corner arc forming the electrode shape, the corner arc generation means forms an arc having the same radius as the corner arc forming the workpiece shape and continuous with the adjacent graphic element. Generated.
For this reason, it can be used as it is as the radiation mode electrode shape, and the need for manual correction is eliminated.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the embodiments shown in the drawings. It should be noted that the present invention is not limited by this. FIG. 1 is a conceptual diagram showing the configuration of a CAD / CAM device 1 according to an embodiment of the present invention. This CAD
The / CAM device (1) has an information input unit (2), an information storage unit (3), an information analysis unit (4), an information display control unit (5), and a display unit (6). ing.

Next, the operation will be described in the order of operation with reference to the flowchart of FIG. The processing drawing input in advance by the information input unit (2) is displayed on the display unit (6). In step (S1), the processing target shape included in the processing drawing displayed on the display unit (6) is extracted. For example, as shown in FIG. 3, the shape to be processed (E1) included in the displayed processed drawing is square (two points (A) with a mouse,
(B is generated by hitting).

In step (S2), a deformation direction is designated by designating one graphic element (line segment or arc) of the shape to be processed and which side of the graphic element is the processing side. For example, as shown in FIG. 3, the mouse is hit on the line segment (C), and then an arbitrary point (D) on the right side of the line segment (C).
Is hit with a mouse to indicate that the right side of the line segment (C) is the processing side. As a result, the inside of the processed shape (E1) is designated as the deformation direction.

In step (S3), the information input unit (2)
Input the swing amount using a keyboard or the like.
In step (S4), the swing deformation process shown in FIG. 10 is performed (this has been described above).

In step (S5), the information input unit (2)
Specifies whether the electrode to be designed is for the circular mode or the radiation mode. For example, as shown in FIG.
Specify the mode from the side menu displayed in. In step (S6), if it is for the circular mode, the process proceeds to step (S8). If it is for the radiation mode, go to step (S7).

In the step (S7), an information analysis section ( 4 )
Thus, the correction processing for the corner arc is performed. That is, in step (S12) shown in FIG. 5, the corner arc of the graphic element of the shape to be processed is returned to the corner arc having the same radius as the original corner arc, and is continued to the adjacent line segment. Adjust the position as follows.

In step (S8), the obtained electrode shape is displayed on the display unit (6) by the information display control unit (5). FIG. 6 illustrates a shape to be processed (broken line) and an electrode shape (solid line) obtained by swing deformation of the shape.

As another embodiment of the present invention, an embodiment using the processing of FIG. 7 instead of the processing of FIG. This is to design the electrode in consideration of the discharge gap amount in addition to the swing amount. In this CAD / CAM device,
In step (S12) of FIG. 7, a corner arc is obtained in the same manner as in the CAD / CAM device (1). Next, in step (S13), as for a line segment among graphic elements constituting the workpiece shape, when the angle between the line segment and the Y axis is θ and the discharge gap amount is g, the deformation direction {G · cosθ} for the X-axis direction, {g · sin} for the Y-axis direction
Move by θ｝. Then, in step (S14),
With respect to the arc of the graphic element constituting the workpiece shape, if the deformation direction is inside the arc, the radius is reduced by the discharge gap amount g while the center of the arc is fixed.
If the deformation direction is outside the arc, the radius is increased by the discharge gap amount g with the center of the arc fixed.

FIG. 8 shows a general system configuration diagram of a CAD / CAM apparatus. This configuration includes a CPU (11) for processing shape information, a memory (12) for storing various information, a printer (13) for recording shapes and characters, and a paper tape for punching various information on a paper tape. Paper tape input / output device (14) for reading various information from a computer, and a CRT for displaying shapes and characters
A display unit (15), a keyboard (16) for inputting information, and a mouse (or tablet) (1) for inputting information necessary for drawing on the CRT display unit (15)
7), an auxiliary storage device (18) for writing information to be stored and reading the stored information, and a bus (19) for connecting all of these components.

[0023]

According to the CAD / CAM apparatus of the present invention, it is possible to design an electrode shape having a corner arc having the same radius as the corner arc of the shape to be processed. Therefore, the radiation mode electrode can be designed without manual correction. Further, it is possible to easily select the circular mode and the radiation mode, and the usability is improved.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing the configuration of an embodiment of a CAD / CAM apparatus according to the present invention.

FIG. 2 is a flowchart illustrating an operation of the CAD / CAM device of FIG. 1;

FIG. 3 is an explanatory diagram relating to an information input unit of the CAD / CAM device of FIG. 1;

FIG. 4 is another explanatory diagram related to the information input unit of the CAD / CAM device in FIG. 1;

FIG. 5 is a flowchart of a correction process for a corner arc of the CAD / CAM device of FIG. 1;

FIG. 6 is an exemplary view of an electrode shape by the CAD / CAM device of FIG. 1;

FIG. 7 is a flowchart of a process according to another embodiment of the CAD / CAM device of the present invention.

FIG. 8 is a system configuration diagram of a general CAD / CAM device.

FIG. 9 is a conceptual diagram of an example of a conventional CAD / CAM device.

FIG. 10 is a flowchart of a swing deformation process in a conventional CAD / CAM device.

FIG. 11 is an explanatory diagram of swing deformation of a line segment in a conventional CAD / CAM device.

FIG. 12 is an explanatory diagram of swing deformation of an arc in a conventional CAD / CAM device.

FIG. 13 is an exemplary diagram of an electrode shape by the CAD / CAM device of FIG. 9;

[Explanation of symbols]

 Reference Signs List 1 CAD / CAM device 2 Information input unit 4 Information analysis unit 6 Display unit E1 Worked shape d Swing amount g Discharge gap amount

Claims (3)

(57) [Claims] 1. C for designing an electrode shape for die-sinking EDM
In an AD / CAM apparatus, when the swing amount for swinging an electrode during electric discharge machining is d, for a line segment among graphic elements constituting a machining shape, an angle formed by the line segment with the Y axis is θ. D · cos θ in the X-axis direction and d · sin θ in the Y-axis direction
A line segment generating means for moving the line segment only to obtain a line segment constituting the electrode shape, and for an arc which is not a corner arc among the graphic elements, the center of the arc is fixed and the radius is set to a swing amount d. Arc generating means for obtaining an arc forming the electrode shape by changing only the shape of the electrode, and for a corner arc of the graphic element, fixing the radius of the corner arc and moving the center so as to be continuous with an adjacent graphic element. And a corner arc generating means for obtaining a corner arc forming the electrode shape. 2. A CAD / CAD system according to claim 1, further comprising a discharge gap amount deforming means for further deforming all the graphic elements constituting the electrode shape by the discharge gap amount.
CAM device. 3. The method according to claim 1, wherein the center of the circular arc is fixed and the radius is set to the swing amount d for all the circular arcs of the graphic element of the shape to be processed.
A full-arc generating means for obtaining an arc constituting the electrode shape by changing only the same, a mode selection screen display controlling means for performing a display for selecting a circular mode and a radiation mode on a screen of a display,
When the circular mode is selected, a circular mode electrode shape generation control means for generating an electrode shape by the line segment generating means and the full arc generating means, and when the radiation mode is selected,
2. A CAD / CAD system according to claim 1, further comprising: a radiation mode electrode shape generation control means for generating an electrode shape by the line segment generation means, the arc generation means, and the corner arc generation means.
CAM device.