JP2788137B2 - Numerical control data creation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerical control (hereinafter, referred to as NC) machine tool for machining a three-dimensional shape.
The present invention relates to an NC data creation device that creates C data.

[0002]

2. Description of the Related Art Generally, a tool trajectory of a three-dimensional mold processing proceeds in a scanning direction and a picking direction as shown in FIG. The NC data creation device creates, for example, machining data for rough machining, machining data for semi-finishing, and machining data for finishing based on the tool trajectory and various machining tool shapes. For example, as shown in FIG. 7, the uncut portion remaining on the work when processing is performed using these processing data is generated in the concave portion, and increases as the tool diameter increases. Therefore, if the machining range in the current process (intermediate finishing and finishing) is specified only for the uncut portion of the previous process (rough machining and intermediate finishing), machining efficiency can be increased. For example, in the case of the uncut portion machining with the rough machining data by the semi-finishing machining data, the semi-finishing machining data indicated by the dashed line in the range of the arrow in FIG. Is calculated by
Roughing data and semi-finishing data are displayed on a graphic display and are determined by visual judgment.

[0003]

As described above, the portion where the uncut portion is generated always has a concave shape, but it is difficult to specify it accurately because the operator specifies the machining range. . For this reason, the operator specifies the machining range in consideration of a certain margin. However, if the margin is too large, the tool operates unnecessarily and the machining time increases, and if the margin is too small, unmachined parts may be generated. Was.
Also, the part where the uncut part is generated is not limited to one place,
There may be multiple locations over a wide area. In this case, there is a problem in that designating all the uncut portions so that no leakage occurs requires experience and a great deal of time. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to automatically and accurately extract processing data of an uncut portion in a previous process from processing data of a current process in a short time. And providing an NC data creating apparatus for creating NC data with high reliability.

[0004]

SUMMARY OF THE INVENTION The present invention relates to an NC data creating apparatus for creating NC data for performing machining of a three-dimensional shape on an NC machine tool. First machining data for performing machining with a tool and second machining data for performing machining with a second tool
Machining data input means for inputting the first tool;
Entering the shape data and the shape data of the second tool
Tool shape input means, and processing of the first tool and the second tool
A virtual tool that creates a virtual tool with the same tool diameter as the tool diameter difference
Tool creation means, and the virtual tool on the first machining data
Create the envelope shape when moving, and
Part of the envelope that is not included in the envelope shape
Unprocessed part data to be specified as processing data
Uncut part processing to extraction stage and the identified portion as the uncut part processing data from the second processing data
Data extraction means.

[0005]

According to the present invention, when processing the same part of a three-dimensional shape with two different processing data, the processing data for processing the uncut portion in the processing using one processing data is replaced with the processing data for the other processing data. Since it is specified and extracted from among the above, accurate uncut machining NC data can be easily created.

[0006]

FIG. 1 is a block diagram showing an example of an NC data generating apparatus according to the present invention. The first machining data D1 of the rough machining and the second machining data D3 of the semi-finishing machining meet the machining data input means 1 and are sent to the uncut portion machining data specifying means 2. The first tool shape data D2 for rough machining and the second tool shape data D4 for semi-finishing are the same as the tool diameter difference between the first tool and the second tool via the tool shape input means 3.
Tool creation means 4 for creating a virtual tool having a tool diameter of
The virtual tool shape data D5 is created and sent to the uncut machining data specifying means 2. Then, specific information D6 of the uncut portion processing data is created by the uncut portion processing data specifying means 2 based on the first processing data D1 of the rough processing, the second processing data D3 of the semi-finishing processing, and the virtual tool shape data D5. Then, it is sent to the uncut portion processing data extraction means 5. The uncut portion processing data extraction means 5 creates the uncut portion processing data D7 based on the specific information D6 and the second processing data D3 of the semi-finishing process, sends it to the NC program conversion means 6, and outputs the uncut portion processing NC. A program D8 is created.

In such a configuration, the operation example will be described with reference to the flowchart of FIG. 2. The uncut portion processing data specifying means 2 initializes the scan data number NT of the first processing data D1 and adds "1". At the same time, the number NTS of the minute moving block constituting the scan data is initialized and "1" is added (steps S1 to S4). Then, an envelope shape as shown in FIG. 3 when the virtual tool is moved along the NTS-th minute block of the NT-th scan data of the first machining data D1 is created and stored (step S5). When the envelope shape is created for all the minute moving blocks of the NT-th scan data (steps S4 to S6), the same processing is performed for the next scan data (steps S2 to S7), and for all the minute moving blocks of all the scan data. Create an envelope shape.
Next, the scan data number NM of the second processing data D3
Are initialized, and "1" is added, and the number NMS of the minute moving block constituting the scan data is initialized and "1" is added (steps S8 to S11). And
NM of the NM-th scan data of the second processing data D3
A portion that is not included in the envelope shape as indicated by the one-dot chain line in FIG. 4 is specified and stored for the S-th minute movement block (step S12).

When the specification of the portion not included in the envelope shape is completed for all the minute moving blocks of the NM-th scan data (steps S11 to S13), the same processing is performed for the next scan data (steps S9 to S1).
4) Specify a portion that is not included in the envelope shape for all the small moving blocks of all the scan data. Next, FIG.
Then, the start point of the uncut portion processing data and the end point of the uncut portion processing data as shown in (1) are specified for all scan data (step S15). Then, the uncut portion processing data extraction means 5 outputs the data D6 specified by the uncut portion processing data specifying means 2 from the second processing data D3, that is, the starting point of the uncut portion processing data and the end point of the uncut portion processing data. The part not included in the virtual tool's envelope shape on the second processing data D3, which is the processing data during that time, is extracted as the uncut part processing data D7 (step S16), and all the processing ends.

[0009]

As described above, according to the NC data creating apparatus of the present invention, the machining data of the uncut portion is automatically and quickly saved.
Since it can be created accurately in between , high-precision machining can be performed efficiently, and the number of man-hours can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of an NC data creation device of the present invention.

FIG. 2 is a flowchart illustrating an operation example of the device of the present invention.

FIG. 3 is a first diagram for explaining a processing example in the apparatus of the present invention.

FIG. 4 is a second diagram illustrating a processing example in the apparatus of the present invention.

FIG. 5 is a third diagram illustrating a processing example in the apparatus of the present invention.

FIG. 6 is a perspective view showing an example of a tool path.

FIG. 7 is a diagram illustrating an example of an uncut portion.

FIG. 8 is a diagram for explaining a conventional processing example.

[Explanation of symbols]

 2 Uncut portion processing data identification means 4 Virtual tool creation means 5 Uncut portion processing data extraction means

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-62204 (JP, A) JP-A-2-132503 (JP, A) JP-A-62-15057 (JP, A) (58) Investigation Field (Int.Cl. ⁶ , DB name) G05B 19/4093 G05B 19/4155

Claims (1)

(57) [Claims] 1. A numerical control data generating apparatus odor for creating numerical control data used for machining the three-dimensional shape by numerically controlled machine tool Te, a first processed data for performing processing by the first tool first No. 2 for performing machining with 2 tools
(2) processing data input means for inputting processing data;
The shape data of the first tool and the shape data of the second tool are
Tool shape input means for inputting, the first tool and the second
Create a virtual tool with the same tool diameter as the tool diameter difference with the tool
Virtual tool creating means for performing
Create an envelope shape when moving the virtual tool,
2 From the machining data, the part not included in the envelope
Uncut part machining data specified as uncut part machining data
Sharpener extracted with over data specifying means, a specified portion as the uncut part processing data from the second processing data
A numerical control data creating device, comprising: a remaining portion processed data extracting means.