JPH04338805A - Numerical control data preparation device - Google Patents

Abstract

PURPOSE:To obtain a numerical control data producer which can automatically produce the numerical control data in order to effectively machine the part that is left uncut by mistake in the precedent process. CONSTITUTION:An uncut part machining data specifying means 2 specifies the machining data on the part that is left uncut by mistake in the precedent process based on the 1st machining data D1, the 1st tool shape data D2, the 2nd machining data D3, and the 2nd tool shape data D4. Then an uncut part machining data extracting means 5 extracts the part specified as the machining data on the uncut part out of the machining data on the present process.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is an N-type machine for machining three-dimensional shapes using a numerically controlled (hereinafter referred to as NC) machine tool.
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 for machining a three-dimensional mold advances in the scan direction and the pick 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 locus and the shapes of various machining tools. When machining is performed using these machining data, the uncut portions remaining on the workpiece are as shown in FIG. 7, for example, and are generated in the recesses, and the larger the tool diameter, the more the uncut portions. Therefore, machining efficiency can be improved by specifying the machining range in the current process (semi-finishing machining and finishing machining) only to the uncut portion of the previous process (rough machining and semi-finishing machining). For example, in the case of uncut portion machining using rough machining data based on semi-finishing machining data, it is only necessary to extract the semi-finishing machining data shown by the dashed-dotted line in the range of the arrow in Fig. 8, and the operator himself can extract the rough machining data and the semi-finishing machining data. Find it by calculation, or
Rough machining data and semi-finishing machining data are displayed on a graphic display and determined by visual judgment.

0003

[Problem to be solved by the invention] As mentioned above, the area where uncut parts are generated always has a concave shape, but it is difficult to accurately specify the machining range because the operator himself/herself specifies the machining range. . For this reason, operators designate the machining range with a certain amount of margin in mind, but if the margin is too large, the tool will move unnecessarily and machining time increases, and if the margin is too small, there is a risk of unmachined parts. Ta. In addition, the area where uncut parts occur is not limited to one place,
There may be multiple locations over a wide area. In this case, there is a problem in that it requires experience and a lot of time to designate all the uncut parts so that there are no omissions. The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to accurately and automatically extract the machining data of the uncut portion in the previous process from the machining data of the current process, and to create NC data with high machining efficiency. An object of the present invention is to provide an NC data creation device that creates NC data.

0004

[Means for Solving the Problems] The present invention relates to an NC data creation device for creating NC data for processing three-dimensional shapes using an NC machine tool. Based on first machining data for performing machining with a first tool, shape data of the first tool, second machining data for performing machining with a second tool, and shape data of the second tool. , specifying means for specifying a part that cannot be machined with the first machining data and can be machined with the second machining data when machining the same part of the three-dimensional shape as uncut part machining data; This is achieved by including an extraction means for extracting the portion specified as the uncut portion machining data from the second machining data.

[0005]

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

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an example of an NC data creation apparatus according to the present invention. First machining data D1 for rough machining and second machining data D3 for semi-finishing machining are sent to uncut portion machining data identifying means 2 via machining data input means 1. The first tool shape data D2 for rough machining and the second tool shape data D4 for semi-finishing are sent to the virtual tool creation means 4 via the tool shape input means 3, virtual tool shape data D5 is created, and the machining is performed. The remaining processed data is sent to the remaining processed data specifying means 2. Then, the uncut machining data specifying means 2 creates uncut machining data specific information D6 based on the first machining data D1 for rough machining, the second machining data D3 for semi-finishing machining, and the virtual tool shape data D5. The processed data is then sent to the uncut portion machining data extraction means 5. The uncut part machining data extracting means 5 creates uncut part machining data D7 based on the specific information D6 and the second machining data D3 for semi-finishing, and sends it to the NC program converting means 6, which performs the uncut part machining NC. Program D8 is now created.

In such a configuration, an example of its operation will be explained with reference to the flowchart of FIG. 2. The uncut portion machining data specifying means 2 initializes the scan data number NT of the first machining data D1 and adds "1" to it. At the same time, the number NTS of the minute movement block constituting this scan data is initialized and added by "1" (steps S1 to S4). Then, an envelope shape as shown in FIG. 3 when the virtual tool is moved along the NTS-th microblock of the NT-th scan data of the first machining data D1 is created and stored (step S5). After creating an envelope shape for all micro-movement blocks of the NTth scan data (steps S4 to S6), the same process is performed for the next scan data (steps S2-S7), and for all micro-movement blocks of all scan data. Create an envelope shape. Next, the scan data number NM of the second processing data D3
is initialized and incremented by "1", and at the same time, the number NMS of the minute movement block constituting this scan data is initialized and incremented by "1" (steps S8 to S11). and,
NM of the NM-th scan data of the second processing data D3
For the Sth micro-movement block, a portion that is not included in the envelope shape as shown by the dashed line in FIG. 4 is identified and stored (step S12).

[0008] When the identification of the portions not included in the envelope shape for all micro-movement blocks of the NMth scan data is completed (steps S11 to S13), the same process is performed for the next scan data (steps S9 to S1).
4) Identify portions that are not included in the envelope shape for all micro-movement blocks of all scan data. Next, Figure 5
The uncut portion machining data start point and the uncut portion machining data end point as shown in (step S15) are identified for all scan data. Then, the uncut portion machining data extracting means 5 extracts data D6 specified by the uncut portion machining data specifying means 2 from the second machining data D3, that is, the uncut portion machining data start point and the uncut portion machining data end point. The portion not included in the envelope shape of the virtual tool on the second machining data D3, which is machining data during that period, is extracted as uncut portion machining data D7 (step S16), and all processing is ended.

[0009]

[Effects of the Invention] As described above, according to the NC data creation device of the present invention, machining data for uncut areas can be created accurately and automatically, making it possible to efficiently perform high-precision machining. Therefore, it is possible to significantly reduce the number of man-hours.

[Brief explanation of the drawing]

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 example of the operation of the apparatus 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 for explaining a processing example in the apparatus of the present invention.

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

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

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

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

[Explanation of symbols]

2. Means for specifying uncut machining data 4 Virtual tool creation means 5 Uncut part machining data extraction means

Claims (2)

[Claims] Claim 1: In a numerical control data creation device that creates numerical control data for machining a three-dimensional shape using a numerically controlled machine tool, first machining data for machining with a first tool is input. , based on the shape data of the first tool, the second machining data for performing machining with the second tool, and the shape data of the second tool,
identifying means for specifying, as uncut portion machining data, a portion that cannot be machined using the first machining data and can be machined using the second machining data when the same part of the dimensional shape is machined; and the second machining data. A numerical control data creation device characterized by comprising: an extraction means for extracting the portion specified as the uncut portion machining data from the machining data. 2. Creation means for creating a virtual tool having the same tool diameter as the tool diameter difference between the first tool and the second tool, wherein the virtual tool follows the tool trajectory of the first machining data. 2. The numerical control data creation device according to claim 1, wherein an envelope shape is created based on the second machining data, and a portion not included in the envelope shape is specified from the second machining data as the uncut portion machining data.