JPH06274219A - Nc working data generating device in cad device - Google Patents

Abstract

PURPOSE:To reduce the load of NC programming and to generate NC working data excellent in working efficiency and working accuracy. CONSTITUTION:The information of tools to be used is previously registered in a tool library 4, and at the time of generating NC working data, a tool track generating part 3 determines a tool to be used and its track so that rough working is first executed by an owned larger working tool and then determines the tool to be used and its track so that accurate working is executed by an owned smaller working tool. The selection of a tool and its track are determined by the device based upon the working tool information registered in the library 4. Consequently a highly efficient working condition using an optimum tool can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an NC processed data generating device in a CAD device for generating NC processed data based on graphic element data created by a CAD device.

[0002]

2. Description of the Related Art Conventionally, by converting graphic element data generated on a CAD device into a part program or the like in accordance with a machining process, it is possible to reduce the load of NC programming work in a subsequent process. . When building a part program, for example, the graphic element data that makes up the contour line to be machined with the same tool is ordered according to the machining process and grouped together, and the contour line is machined from the machining origin of the machining tool. By adding to the contour line data the tool locus from the start point and the machining locus from the machining end point of the contour line to the machining origin, the load in the NC programming later is reduced.

[0003]

However, in the above-mentioned conventional NC machining data generation device, it is necessary to select a tool based on machining experience and set detailed parameters. Therefore, in addition to being skilled in tool setting, setting errors are likely to occur. In addition, when an appropriate tool is not selected, there are problems that the machining efficiency is poor and the desired machining accuracy cannot be obtained.

The present invention has been made in order to solve such a problem, and reduces the load of NC programming and, at the same time, the NC in a CAD device which generates data for NC processing excellent in processing efficiency and processing accuracy. An object is to provide a processed data generation device.

[0005]

SUMMARY OF THE INVENTION The present invention comprises a tool information storage means for storing tool information used for NC machining based on CAD data, and a contour extraction means for extracting contour data from the CAD data. , Selecting tool information for rough machining from the tool information storage means used based on the contour data extracted by the contour extracting means to generate a tool trajectory during rough machining, and using the tool based on the contour data A tool locus generating means for selecting tool information for precision machining from the information storage means and generating a tool locus for precision machining.

[0006]

According to the present invention, information on a tool to be used is stored in advance in the tool information storage means, and when NC machining data is created, rough machining is first performed with a large machining tool in possession. The tool to be used and the tool trajectory are determined, and the tool to be used and the tool trajectory are determined so that the small machining tool owned next can be used to perform fine machining with high accuracy. The selection of the tool and the tool locus are determined by the device based on the registered tool information used. This makes it possible to provide efficient machining conditions using the optimum tool.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an N according to an embodiment of the invention.
It is a schematic functional block diagram of a C processed data generation device. The graphic element data created by a CAD device (not shown) is stored in the CAD data storage unit 1. The contour tracking unit 2 reads the graphic element data from the CAD data storage unit 1 and extracts the contour data to be processed. The extracted contour data is sent to the tool locus generation unit 3, where the tool locus is generated. Tool path is the tool library 4
It is generated based on the tool information used registered in.
An approach figure is added to the generated tool path by the approach figure adding section 5. The tool trajectory information to which the approach figure is added is converted into desired NC machine data by the NC data generation unit 6.

Next, the operation of the present apparatus thus constructed will be described. When the automatic contour tracing mode is selected from the command menu (not shown), a message such as "Select the first element." Is displayed on the display screen 11 of the device as shown in FIG. When the user operates to specify the tracking start element S1, the contour tracking unit 2 is activated and the automatic contour tracking processing is started. Here, in the case of clockwise tracking as shown in FIG. 2, the leftmost element at the end point is selected. When the point P5 is reached, P4 to P
The semicircular elements up to 5 are divided from the circular elements. Similarly, when the point P8 is reached, the semicircular element from P7 to P8 is divided from the circular element. The contour data is extracted by such a tracking process.

Next, the tool locus generator 3 determines the tool locus according to the procedure shown in FIG. First,
The figure to be processed is checked (S0). Here, the maximum diameter, the minimum diameter, and the gap portion of the processing target graphic are checked and those data are stored. Next, a tool to be used for precision machining is determined (S1). That is, in the tool library 4,
As shown in FIG. 4, usable tool information such as usable tool number, diameter, blade length, proper machining speed, proper rotation speed, number of blades, offset value (amount of uncut) is registered in advance. Therefore, the tool locus generation unit 3 selects the optimum precision machining tool for final finishing based on the machining accuracy information of the separately designated contour data and the search result of the minimum diameter of the contour data obtained in step S0. Select from library 4. As shown in FIG. 5, the precision machining tool 21 is
The diameter D1 ≦ 2r is selected so that the portion of the minimum diameter r can be processed. Subsequently, the offset amount d at the end of rough machining is determined from the diameter of the selected tool for precision machining (S
2). For example, if the tool diameter during precision machining is 2.multidot.r1 = 3 mm, 1 mm, which is smaller than the radius, is determined as the offset amount d. Then, a tool for rough machining suitable for this offset amount d is selected from the tool library 4 (S3). As shown in FIG. 5, the tool 22 for rough machining is
The diameter D2 that is less than or equal to the value obtained by subtracting the offset amount 2d from the width h of the narrow portion obtained in step S0 is selected.
Further, when selecting the tool 22 for rough machining, as shown in FIG. 6, it is necessary to consider the inclination of the side surface of the narrow portion so that there is no interference.

Next, tool trajectories L1, L2, ...
Is determined (S4). For example, assuming that a tool having a diameter of 2 · r2 = 10 mm is selected as a tool for rough machining, FIG.
As shown in, the position offset from the contour by d + r2 = 8 mm to the outside is the position of the primary tool locus L1 during rough machining. Such a tool locus is gradually expanded outward until there is no machining portion. The n-th tool locus Ln is a position offset from the contour by d + nr2 to the outside.

Next, the tool locus L0 during precision machining is determined (S5). As shown in FIG. 8, the tool locus during precision machining is set at a position offset from the contour line by the precision machining tool radius r1. With respect to the tool locus generated by the tool locus generation unit 3 by such processing, the approach figure addition unit 5 makes an approach figure A1 from the machining origin O.
, A2, A3, A4, A5 are added (S6). The finally obtained tool path is A1 → L1 → A2 → L2 →
A3 (rough machining up to here) → A4 → L0 → A5 (precision machining up to this point). The obtained tool path is converted into NC machine data by the NC data generation unit 6. By such processing, so-called island leaving processing using an end mill can be performed efficiently and highly accurately along the contour shape.

[0012]

As described above, according to the present invention, the tool used for rough machining and the tool trajectory are determined based on the information of the tool used, and then the tool used for precision machining and the tool trajectory. Is determined, it is possible to provide an efficient machining condition using the optimum tool.

[Brief description of drawings]

FIG. 1 is a functional block diagram of an NC processed data generation device according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining a contour tracking process in the same apparatus.

FIG. 3 is a flowchart of a tool trajectory generation process in the same device.

FIG. 4 is a diagram showing registered contents of a tool library in the apparatus.

FIG. 5 is a diagram for explaining the concept of tool selection in the same device.

FIG. 6 is a diagram for explaining the concept of tool selection in the same device.

FIG. 7 is a diagram showing a tool path for rough machining in the same device.

FIG. 8 is a view showing a tool locus for precision machining in the same device.

[Explanation of symbols]

1 ... CAD data storage unit, 2 ... contour tracking unit, 3 ... tool trajectory generation unit, 4 ... tool library, 5 ... approach figure addition unit, 6 ... NC data generation unit.

Claims (1)

[Claims] 1. A used tool information storage unit that stores used tool information when performing NC machining based on CAD data, a contour extraction unit that extracts contour data from the CAD data, and a contour extraction unit that extracts the contour data. Based on the contour data, the tool information for rough machining is selected from the tool information storage means for use to generate a tool trajectory during rough machining, and based on the contour data, the tool information storage means for precision machining is used. An NC machining data generation device in a CAD device, comprising: tool locus generation means for selecting tool information and generating a tool locus during precision machining.