JPH06100929B2 - NC data creation method for machining uncut parts in NC data creation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention uses a numerical control (NC) machine tool or an automatic programming function in an automatic programming device for an NC machine tool to remove an uncut portion caused by two-dimensional contour machining. The present invention relates to a method for creating NC data for uncut part machining in an NC data creation device for automatically recognizing and automatically creating machining NC data.

(Prior art) When performing two-dimensional contour machining using an NC machine tool, such as a machining center, after rough machining is performed with a large diameter tool to improve machining efficiency, a portion that cannot be machined with a large diameter tool There is a method of machining the part with a small diameter tool. A specific method of this two-dimensional contour machining will be described with reference to FIG. 3. When machining a shape represented by a straight line and a curve (hereinafter, referred to as machining reference line) indicated by ,, ... The center locus of the small-diameter tool 17 is the part where the workpiece is machined along the central locus 16 of the large-diameter tool, and the parts that cannot be machined later by the large-diameter tool (shaded areas (a) and (b) in the figure)
Process along 18 to obtain the desired machined shape. Here, in order to explain in detail the reason for changing the tool, the description will be made with reference to FIGS. 4 (A) and 4 (B) only in the portion represented by. As shown in FIG. 4 (A), [tool diameter +
Finishing allowance] When the offset tool center locus 19 is calculated,
With a recess (,,) smaller than [tool diameter + finishing allowance], the tool bites into the machining reference line (the shaded area (c) in the figure). Therefore, if the tool center locus causes a loop 20, the tool locus 16 in which the loop 20 is deleted may be obtained as shown in FIG. 4 (B), and the uncut portion (hatched portion (a) in the figure) It will be processed with a tool 17 having a small diameter. This method is called a tool interference check method.

(Problems to be solved by the invention) When creating NC data for two-dimensional contour machining by the tool interference check method as described above in the NC data creation device,
First, the NC data for the large diameter tool is created by the tool interference check function so that the tool does not bite into the machining reference line, and then the NC data for the small diameter tool is created by the operator to create a CRT.
Since the displayed locus of the uncut portion was confirmed and the data was input again, there was a problem that the input operation had to be repeated and a lot of man-hours were required.

(Object of the invention) The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to store an uncut portion generated by two-dimensional contour machining by an NC data creating device and then to leave the uncut portion by calculation. By automatically creating NC data for partial machining,
An object of the present invention is to provide an NC data creating method for machining an uncut portion in an NC data creating device that can reduce the number of steps.

(Means for Solving the Problem) In the present invention, when the NC data creating device generates NC data of the uncut portion generated at the time of two-dimensional contour machining, the tool center locus is based on the machining information and the machining reference line. Is calculated, and the tool center trajectory obtained by the tool interference check for this tool center trajectory is displayed graphically. Calculate and add to the figure and display 2
NC data for dimensional contour processing is created.

(Operation) According to the present invention, a tool center locus is calculated based on a plurality of tool diameters to be used, machining information of finishing allowance, and a machining reference line, and a tool interference check calculation is performed on the tool center locus to obtain a machining reference line. The tool center locus that does not cut into the tool is calculated and displayed graphically, and if there are uncut parts in the tool interference check, the machining reference line of all uncut parts and the tool center locus of uncut parts are calculated and displayed graphically. However, it is possible to automatically create NC data for processing the uncut portion of the two-dimensional contour processing, and it is possible to save the NC data creation labor.

Embodiments of the Invention Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an outline of a main part of an NC data creating apparatus which realizes the method of the present invention. Information on a plurality of tool diameters and finishing allowances used for contouring by operating a keyboard 1 which is an input device. SX is input and processing information storage unit 2
In addition, the information SY of the machining reference line for the tool to move along is input and stored in the machining reference line storage unit 3. Required tool diameter and finishing allowance information SW in the machining information storage unit 2 and machining reference line information SB in the machining reference line storage unit 3 are input to the machining path calculation unit 4 for processing, The center locus is calculated. Based on the information SC of the tool center locus,
The tool interference check unit 5 checks whether or not the tool interferes with the machining reference line, and recalculates the tool center locus of the interfering portion. Tool center locus information after interference check SCR
Is converted into NC data by the NC data conversion unit 6, this data is stored in the NC data storage unit 7 and output as the NC tape 13, and is graphically displayed on the CRT 14 via the NC data display unit 8. After the interference check in the tool interference check unit 5, if there is an uncut portion, the information SR of the uncut portion and the processing reference line information from the processing reference line storage unit 3
The uncut portion reference line calculation unit 9 calculates the uncut portion reference line based on the SP, and this data is stored in the uncut portion reference line storage unit 10 and is also displayed on the CRT 14 via the uncut portion display unit 12. Graphically displayed. Signal SZ from keyboard 1
Then, one uncut part reference line in the uncut part reference line storage unit 10 is processed by the processing reference line storage unit 3 via the reference line extraction unit 11.
And is used as a machining reference line for machining the uncut portion.

FIG. 2 is a flow chart showing an operation example of the NC data creating method for machining the uncut portion described above, and the operation will be described with reference to this flow chart.

First, an operator or the like uses the keyboard 1 to input a plurality of tool diameters and finishing allowances to be used for contour processing and input the processing information storage unit 2
Then, the processing reference line is stored in the processing reference line storage unit 3 using the keyboard 1 (step S1). The machining path calculation unit 4 takes out the necessary tool diameter and finishing allowance based on the machining reference line, calculates the tool center locus offset by [tool diameter + finishing allowance] (step S2), and the tool interference checking unit 5 uses this tool. Performs a tool collision check calculation of the center locus to calculate a tool center locus that does not cut into the machining reference line (step S
3). The tool center locus checked for tool interference is converted into X, Y, Z coordinate values by the NC data conversion unit 6, NC codes such as G code and M code are added to create NC data, and the NC data is stored. Output as NC data 13 via the part 7,
Graphic display is performed on the CRT 14 via the NC data display unit 8 (step S4). It is confirmed by the tool interference check whether or not there are uncut portions (step S5), and if there are, the uncut portion reference line calculation unit 9 retrieves all the processing reference lines of the uncut portions from the processing reference line storage unit 3 and performs cutting. The uncut part reference line is calculated and stored in the uncut part reference line storage unit 10, and the uncut part reference line is graphically displayed on the CRT 14 through the uncut part display unit 12 in a color different from the working reference line. (Step S6). Further, the reference line extracting unit 11 takes out one of the uncut portion reference lines stored in the uncut portion reference line storage unit 10 and sets it in the processing reference line storage unit 3 (step S
7), return to step S2.

On the other hand, if there is no uncut portion in the judgment step S5, it is confirmed whether or not the processing of the uncut portion is completed (step S8). If not, the process proceeds to step S7, and the above-mentioned operation is performed. Do. On the other hand, if the determination step S8 ends, the process ends.

(Effect of the invention) As described above, according to the method of the present invention, since the NC data creating device automatically creates the NC data for machining of the uncut portion generated in the two-dimensional contour machining, the machining time and the program creation time Can be greatly shortened.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of a main part of an NC data creating apparatus for realizing the method of the present invention, FIG. 2 is a flow chart for explaining the operation of the method of the present invention, and FIG. 3 is a specific method of two-dimensional contour processing. 4A and 4B are views for explaining a tool interference checking method. 1 ... Keyboard, 2 ... Machining information storage section, 3 ... Machining reference line storage section, 4 ... Machining path calculation section, 5 ... Interference check section, 6 ... NC data conversion section, 7 ... NC data Storage unit, 8 ... NC data display unit, 9 ... Uncut portion, reference line calculation unit, 10 ... Uncut portion, reference line storage unit, 11 ... Reference line extraction unit, 12 ... Uncut portion display unit, 13 ... NC tape, 14 ...
… CRT.

Claims (1)

[Claims] 1. When generating NC data of an uncut portion generated during two-dimensional contour machining by an NC data creation device, a tool center locus is calculated based on machining information and a machining reference line,
The tool center locus obtained by the tool interference check for this tool center locus is graphically displayed, and the uncut portion reference line of the uncut portion generated by the tool interference check and the tool center locus of the uncut portion are calculated and Displayed in addition to the figure,
2D contour machining NC data is created.
NC data creation method.