JPH0523902B2 - - Google Patents

Description

Detailed Description of the Invention (Technical Field of the Invention) The present invention provides optimum automatic programming for numerically controlled lathes that automatically adjusts the depth of cut of a tool and automatically generates an efficient cutting path for the tool. This invention relates to a cutting path generation method.

(Technical background of the invention and its problems) In the automatic program and interactive manual data input for numerically controlled lathes, there is a method in which cutting paths are sequentially generated according to cutting conditions such as the shape of the cutting workpiece and the depth of cut. It is widely practiced.

However, with this path generation method, the depth of cut of the tool is constant from beginning to end, so in the case of a workpiece with many steps, a cutting path may be created in which the depth of cut is different depending on the cutting shape. This has the disadvantage that the cutting efficiency may deteriorate.

(Object of the invention) The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to automatically adjust the depth of cut of a tool during machining and automatically generate an efficient cutting path. An object of the present invention is to provide a method for generating an optimal cutting path in automatic programming for a numerically controlled lathe.

(Summary of the Invention) The present invention relates to an optimal cutting path generation method in automatic programming for a numerically controlled lathe. and the allowable depth of cut increment ratio, etc., set the current cutting path and the next cutting path based on the depth of cut, and then correct the depth of cut by the allowable depth of cut ratio. Based on the corrected depth of cut, set the current corrected cutting path and the next corrected cutting path, compare the difference and ratio of cutting length in the next cutting path with the difference and ratio of allowable cutting length, respectively, If both of the two terms are smaller than the allowable value, the uncorrected cutting path is adopted as the current cutting path, and if they are larger, the corrected cutting path is adopted, and this process is repeated until all cutting paths of the cutting workpiece are determined. This is what I decided to do.

(Embodiment of the Invention) FIG. 1 is a diagram showing an example of the configuration of an optimal cutting path generation unit that realizes the method of the present invention, in which cutting workpiece shape data, depth of cut, cutting conditions, etc. are Cutting data such as tool data is input via the keyboard 2. Input control section 3
stores each input data in the cutting work shape memory section 4 and the cutting data memory section 5, respectively. Further, the setting input control unit 10 causes the setting storage unit 11 to store set values such as the allowable cutting length difference, ratio, and allowable depth of cut increment ratio that are input via the keyboard 9 according to the guidance displayed on the display 8. . The cutting path generation section 6 automatically generates an efficient cutting path using the method described below based on the inputted cutting workpiece shape data, cutting data, and each setting value, and stores this cutting path data in the cutting path storage section 7. .

Figure 2 is a diagram showing the cutting path when the depth of cut (T) is kept constant as before.
The cutting workpiece is processed using the cutting path shown in the figure. In this case, the cutting path,
In the FG, DE, and AB sections, a path with a small amount of cutting is generated.

FIG. 3 is a flowchart showing a method for generating an optimal cutting path according to the present invention, and FIG. 4 is a diagram showing an example of an optimal cutting path generated by the method of this invention. The cutting path shown in Fig. 2 is set using the depth of cut T of the tool (step S1), and based on this, the next cutting path is set by adding the depth of cut T shown in Fig. 2 (step S2). . Furthermore, the corrected depth of cut T× which is the addition of the allowable depth of cut increment ratio (α) to the depth of cut T
Based on (1+α), the current corrected cutting path indicated by ' in Fig. 4 is set (step S3), and based on this, the next corrected cutting path ' shown in Fig. 4 is added by adding the depth of cut T. (Step S4).

The cutting length of the next cutting path and corrected cutting path' obtained in this way is determined (step
S5), the difference and ratio of the two calculated cutting lengths are determined and compared with the difference and ratio of allowable cutting lengths set in advance (step S6). In this comparison, if the difference and ratio of cutting lengths are smaller than the allowable values, it is assumed that the cutting efficiency has not improved much by modifying the cutting path, and the cutting path is determined as the current cutting path (step S7).
In addition, if the difference and ratio of cutting lengths are larger than the allowable value, it is considered that the cutting efficiency has been improved by modifying the cutting path, and the corrected cutting amount ′ is
is determined (step S8). Furthermore, using the same method, the cutting paths ', ', . . . are sequentially determined.

By the way, the cutting word shape data and the cutting data may be input by transferring the data from another system without using the display 1 and the keyboard 2, and the functions of the input control section 3 and setting value input control section 8 can be changed. Each data may be inputted by one input control section.

(Effects of the Invention) As described above, according to the method of the present invention, by automatically generating an efficient cutting path, the machining time can be shortened and the efficiency of machining can be improved.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a configuration example of the optimal cutting path generation section according to the present invention, Fig. 2 is a diagram showing the cutting path when the depth of cut is constant, and Fig. 3 is a diagram showing the generation of the optimal cutting path according to the invention. A flowchart illustrating the method, FIG. 4, is a diagram illustrating the optimal cutting path generated by the present invention. 1, 8... Display, 2, 9... Keyboard, 3... Input control section, 4... Cutting work shape memory section, 5... Cutting data storage section, 6... Cutting path generation section, 7... Cutting Route storage unit, 10... Setting value input control unit, 11... Setting value storage unit.

Claims (1)

[Claims] 1 In the path generation method in automatic programming, input cutting data such as the shape of the cutting workpiece and depth of cut, as well as input setting values such as allowable cutting length difference, allowable cutting length ratio, and allowable cutting depth increment ratio. death,
Based on the depth of cut, set the current cutting path and the next cutting path, and then set the depth of cut as the current corrected cutting path based on the corrected depth of cut corrected by the allowable cutting increment ratio. The next corrected cutting path is set, and the difference and ratio of the cutting length in the next cutting path are compared with the difference and ratio of the allowable cutting length, and if both of the two terms are smaller than the allowable value, the cutting path is selected as the current cutting path. Optimal in automatic programming, characterized in that the process of deciding to adopt an uncorrected cutting path and deciding to adopt a corrected cutting path if the value is larger is repeated until all cutting paths of the cutting workpiece are determined. Cutting path generation method.