JPH04357504A - Cad/cam device - Google Patents

Abstract

PURPOSE:To prepare the three-dimensional processing path to evade a two-dimensional processing surface by preparing the curved surface of the same shape as the two-dimensional processing surface at the time of preparing the three- dimensional processing path, in a CAD/CAM device to prepare the three- dimensional curved surface processing path. CONSTITUTION:When the command to output the path to evade the two-dimensional processing surface from an input device 2 and to process the three- dimensional curved surface is inputted, an automatic curved surface preparing part 13 prepares the interference evading curved surface of the same shape as the two-dimensional processing surface. A path preparing part 16 prepares the path on the three-dimensional curved surface, and a curved surface interference checking part 15 checks the interference with the path and the interference evading curved surface and the path to evade the interference evading curved surface is outputted.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention relates to a CAD/CAM device that generates a machining path (hereinafter referred to as a path), and in particular, the present invention relates to a CAD/CAM device that generates a machining path (hereinafter referred to as a path), and in particular, the present invention relates to a CAD/CAM device that generates a machining path (hereinafter referred to as a path). The present invention relates to a CAD/CAM device that generates paths that are advantageous for machine tools that perform.

0002

2. Description of the Related Art FIG. 9 shows a schematic block diagram of a conventional CAD/CAM device. Conventional CAD/CAM equipment is
a central processing unit (11) that performs control calculations for the entire device; a shape definition unit (12) that defines a shape for path generation;
and an offset curved surface generation section (14) that offsets the curved surface defined by the shape definition section (12), a curved surface interference check section (15) that checks interference between the offset curved surfaces, and a curved surface interference check section (15) that checks interference between the offset curved surfaces. It includes a central processing unit (hereinafter referred to as CPU) (1) having a path generation unit (16) that generates a path based on the path.

[0003] Also, an input device (2) for inputting input data to the CPU (1), a display device (3) for graphically displaying the curved surface and the path based on the calculation results of the CPU (1), a storage device (4) for storing calculation program data and calculation results of the CPU (1);
The configuration includes an output device (5) that outputs the path generated by the PU (1) to the outside.

Next, conventional CAD/C based on the above configuration
The curved surface S and two-dimensional shape P1 shown in FIG. 3 are created by the AM device.
A method of generating the path C1 shown in FIG. 7 and the path C2 shown in FIG. 8 on the upper surface of the image will be explained based on the shape data format diagram of FIG. 3 and the flowchart shown in FIG. 10.

First, a command to define the curved surface S1 and the two-dimensional shape P1 shown in FIG. 3 is inputted from the input device (2).
The shape definition unit (12) creates a curved surface S1 and a two-dimensional shape P.
1 is defined (S1).

Next, the input device (2) selects a curved surface S2 including the top and side surfaces of the two-dimensional shape P1 (see FIG. ), and the shape definition unit (12) defines the curved surface S2 (S
11).

Next, the input device (2) generates a path C1 on the curved surface S1 while avoiding the curved surface S2 as an interference shape,
Next, a command to generate the upper surface path C2 of the two-dimensional shape P1 is input (S2).

Based on the command to generate the paths C1 and C2, the curved surface offset unit (14) offsets the curved surfaces S1 and S2 to create offset curved surfaces S10 and S20 (
FIG. 5) is generated (S4). Further, based on the command to generate C1 and C2, the path generation unit (16) generates a path C10 on the offset curved surface S10 and a path C20 on the offset curved surface S20 (see FIG. 6).

[0009] Then, the curved surface interference check section (15) compares the path C10 and the path C20, outputs the one with the higher Z height, and generates the path C1 (S5). Based on the command to generate the paths C1 and C2, the path generation unit (16) generates the upper surface path C2 (see FIG. 8) of the two-dimensional shape P1, and ends the process (S6).

0010

[Problem to be solved by the invention] Conventional CAD/CAM
Since the device is configured as described above, in order to avoid a two-dimensional shape that only has an outline curve and height and generate a path on a curved surface, it is necessary to create a curved surface that has the same shape as the two-dimensional shape. This required complicated work such as definition.

The present invention was made to solve the above-mentioned problems, and provides a CAD/CAM device that can generate a path on a curved surface without defining a curved surface having the same shape as a two-dimensional shape. The purpose is to obtain.

0012

[Means for solving the problem] CAD in this invention
/CAM device, when generating a continuous path based on defined shape data, automatically generates a curved surface having the same shape as the two-dimensional shape from the two-dimensional shape in the shape data. , offset curved surface generation means for offsetting the curved surface in the shape and the curved surface generated by the curved surface automatic generation means, curved surface interference checking means for checking interference between the offset curved surface and the path, and a check result of the curved surface interference checking means. and path generation means for generating a path based on the path.

Further, the automatic curved surface generation means sweeps a contour curve defined as a machining range of a two-dimensional shape for performing two-dimensional plane machining along the Z-axis direction of the three-dimensional space to create a contour curve of the two-dimensional shape. A side surface portion is generated, and the contour curve is repeatedly reduced inward to generate a two-dimensional top surface portion.

[0014]

[Operation] According to the present invention, the automatic curved surface generation means generates a curved surface of the same shape as the two-dimensional shape based on the contour curve of the defined two-dimensional shape, and then connects the curved surface for generating a path with the two-dimensional curved surface. A curved surface having the same shape as the dimensional shape is offset by a tool radius using a curved surface offset means.

Thereafter, the curved surface interference checking means checks whether there is a curved surface having the same shape as the two-dimensional shape, which is offset from the curved surface for generating the path, above or below the curved surface offset from the curved surface for generating the path. The means generates a path on the upper offset curved surface based on the check result of the curved surface checking means.

Further, the automatic curved surface generation means of the present invention sweeps the contour curve of the defined two-dimensional shape along the side surface of the two-dimensional shape, and then reduces the upper surface of the contour curve along the inside. A curved surface having the same shape as the two-dimensional shape is generated.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1, 3 and 4. Figure 1 shows the CA according to this embodiment.
FIG. 3 shows a block diagram of the overall circuit of the D/CAM device, FIG. 3 shows a state of a shape to be a path generation target, and FIG. 4 shows a state of a curved surface.

CAD/CAM according to this embodiment shown in FIG.
The device includes a CPU (1a) that generates continuous paths on defined curved surface data, an input device (2) that inputs information necessary for path generation by the CPU (1a), and a
A display device (3) that visually displays the path generated in step 1a).
), a storage device (4) for storing the calculation results of the CPU (1a) and data necessary for the calculation, and the CPU (1a)
The configuration includes an output device (5) that outputs the path generated in the above to the outside.

The CPU (1a) is a central processing unit (1a) that performs data input/output for path generation and other control operations for the entire device.
1) and a curved surface S1 as shown in Fig. 3 to generate a path.
and a shape definition unit (12) that defines the two-dimensional shape P1;
The contour outline l of the defined two-dimensional shape P1 is swept along the side surface portion P2 of the two-dimensional shape P1, and then reduced along the top surface portion P3 of the two-dimensional shape P1, as shown in FIG.
The automatic curved surface generating section (13) generates the curved surface S2 shown in FIG.

[0020] Similarly to the prior art, the curved surfaces S1,
An offset curved surface generation unit (
14), and the interference between the offset curved surfaces S10 and S20 is determined by checking whether the offset curved surface S20 is located above or below the offset curved surface S10 with respect to one point on the offset curved surface S10 that is the source of path generation among the offset curved surfaces. a curved surface interference check section (15) that checks the interference check section; and a path generation section (15) that generates paths on the offset curved surfaces S10 and S20 based on the check results of the interference check section.
6).

Next, the operation of this embodiment based on the above configuration will be explained based on the shape shown in FIG. 3 and the path C1 shown in FIG. 7 and FIG.
An example of generating path C2 shown in FIG. 5 will be described based on the flowchart of FIGS.

First, a curved surface definition command and curved surface definition data are inputted from the input device (2), and the curved surface S is inputted into the shape definition section (12).
1 is defined (S1). Next, the two-dimensional shape definition command and the two-dimensional shape definition data, ie, the contour l of the two-dimensional shape and the height d of the contour l, are inputted from the input device (2), and the two-dimensional shape P1 is inputted into the shape definition section (12). Define (S1).

Furthermore, the input device (2) generates a path C1 in which the curved surface S1 is the processing target and the two-dimensional shape P1 is the path avoidance target. A command to generate path C2 is input (S2). The central processing unit (1
1) starts the curved surface automatic generation unit (13), sweeps the contour l of the two-dimensional shape P1 by a distance d along the side surface portion P2 of the two-dimensional shape P1, and then converts the contour l to the two-dimensional shape P
The two-dimensional shape P1 is reduced along the upper surface portion P3 of
A curved surface S2 having the same shape as is generated (S3).

The central processing unit (11) activates the offset curved surface generation unit (14), and offsets the curved surfaces S1 and S2 by the tool radius to generate offset curved surfaces S10 and S20, respectively (S4).

[0025] Next, the central processing unit (11) operates a path generation unit (
16) and create the path C10 on the offset curved surface S10.
and the path C20 on the offset curved surface S20.Then, the central processing unit (11) starts the curved surface interference check unit (15), compares the Z heights of the paths C10 and C20, and calculates the Z height.
Output the higher path as path C1 (S5)
.

Furthermore, the central processing unit (11) activates the path generation unit (16) to generate a two-dimensional path C2 on the upper surface P3 of the two-dimensional shape P1 (S6).

Further, in the above embodiment, a stand-alone CAD/CAM device was shown as the H/W configuration, but the same effect can be obtained by applying the present invention to an automatic programming function built into an NC device.

[0028]

As described above, according to the present invention, when generating a path on a curved surface, a curved surface having the same shape as the two-dimensional shape is automatically generated from a two-dimensional shape. Since the configuration is configured to generate a path on the curved surface while avoiding the above, there is an effect that the redundant and complicated work of defining a curved surface having the same diameter as the two-dimensional shape is eliminated.

Furthermore, the present invention sweeps a contour curve defined as a machining range of a two-dimensional shape for performing two-dimensional plane machining along the Z-axis direction of a three-dimensional space to obtain a side surface portion of the two-dimensional shape. A curved surface of a two-dimensional shape can be easily generated by repeatedly reducing the contour curve inward to generate an upper surface portion of the two-dimensional shape.

[Brief explanation of the drawing]

FIG. 1 is an overall circuit block diagram of a CAD/CAM device according to an embodiment of the present invention.

FIG. 2 is an operation flowchart in the embodiment shown in FIG. 1;

FIG. 3 is a shape data format diagram showing a two-dimensional shape definition method.

FIG. 4 is a shape data format diagram illustrating a process of generating a curved surface from a two-dimensional shape.

FIG. 5 is a shape data format diagram showing each offset curved surface.

FIG. 6 is a diagram showing a path generation mode on an offset curved surface.

FIG. 7 is a diagram showing how paths are generated on a defined curved surface.

FIG. 8 is an overall circuit block diagram on a two-dimensional shape surface.

FIG. 9 is an overall circuit block diagram of a conventional CAD/CAM device.

FIG. 10 shows a flowchart explaining the operation of the conventional device.

[Explanation of symbols]

(2) Input device (12) Shape definition section (13) Automatic curved surface generation section (14) Offset curved surface generation section (15)
Curved surface interference check section (16) Path generation section

Claims (2)

[Claims] 1. In a CAD/CAM device that generates a machining path based on defined curved surface data, automatic curved surface generation means that generates a curved surface having the same shape as a defined two-dimensional shape; an offset curved surface generating means for generating an offset curved surface from the generated curved surface and a curved surface to be processed; a curved surface interference checking means for determining interference between both of the generated offset curved surfaces; A CAD/CAM device comprising a machining path generating means for generating a machining path on the generated offset curved surface of the workpiece while avoiding an offset curved surface of a two-dimensional shape. [Claim 2] CAD/CA according to claim 1
In the M device, the automatic curved surface generation means sweeps a contour curve defined as a machining range of a two-dimensional shape for performing two-dimensional plane machining along the Z-axis direction of a three-dimensional space, and generates a side surface portion of the two-dimensional shape. A CAD/CAM device that generates an upper surface portion of a two-dimensional shape by repeatedly reducing the contour curve inward.