JPS63148306A - Generation system for groove-shaped tool course in numerically controlled lathe - Google Patents

Abstract

PURPOSE:To considerably reduce the man-hour by dividing a work area for groove formation to automatically obtain tool courses having individual shapes. CONSTITUTION:The groove bottom of a divided area (a) is cut, and the left of the divided area (a) is cut, and the right of the divided area (a) is cut. This work is so set that the R center of the front end of a tool 14 is brought on the boundary of a division line 11, thereby preventing omission of cutting. Next, the groove bottom of a divided area (a) is cut, and the left of the divided area (b) is cut, and the right of the divided area (b) is cut, and finally, parts to be cut of the divided area (b) are cut to terminate the work.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a method for generating a groove shape tool path when creating a grooving nib program using an automatic programming device or an interactive manual data input device for a numerically controlled lathe.

(Technical Background of the Invention and its Problems) A numerically controlled lathe uses the path along which the tool should move, that is, the coordinate values,
It is operated by an NC program that provides NO data and commands such as tool feed rate and spindle rotation speed to the numerically controlled lathe.

A numerically controlled lathe inputs the machining shape and material shape in an interactive manner, automatically determines the tool path, and creates the above-mentioned NC program.

However, conventionally, in groove machining, although it is possible to automatically create an NC program for machining a rectangular or trapezoidal groove shape, it is not possible to automatically create an NC program for machining an arbitrary shape groove with multiple groove bottoms. There was a problem in that it required a large amount of man-hours because it was not possible to do so and relied on manual labor.

(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 process a groove of any shape with multiple groove bottoms by analyzing the shape. An object of the present invention is to provide a method for generating a groove-shaped tool path in a numerically controlled lathe that can create an NC program.

(Summary of the Invention) The present invention is a method for generating a tool path for machining a groove shape in a numerically controlled lathe, by reading groove shape data and tool width, automatically searching for groove shape elements, and creating a parting line. , a plurality of decomposition regions surrounded by the dividing line, the machining shape line, and the material shape line are found, and the tool path of each of the decomposition regions is found.

(Example 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 embodiment of an automatic programming device for a numerically controlled lathe that implements the method of the present invention. A keyboard 1, which is an input device, is used to manually enter data on an arbitrary-shaped groove, a rough cutting tool width, and a finishing tool width. CR
T2 displays a graphically shaped groove with an arbitrary shape, a rough cutting tool width, and a finishing tool width. The data of the arbitrary shape groove is input to the groove shape input section 4 via the input control section 3, the groove shape division section 5 calculates the division line of division point 1 and the division area, and the tool path calculation section 6 calculates the tool path. NG program 7 is generated.

FIG. 2 shows the operation of the groove-shaped tool path generation method according to the present invention described above, in which an operator or the like specifies a straight line and nine circular arcs on the arbitrary machining shape designation screen displayed on the CRT. When an arbitrary shaped groove, a rough cutting tool width and a finishing tool width are input from the keyboard 1, a screen as shown in FIG. 3 is immediately displayed on the CRT 2. Here, when the tool width is not manually determined, the minimum groove width of the arbitrarily shaped groove is automatically searched for, and that width becomes the tool width. Subsequently, via the input control section 3, the groove shape manual section 4 reads the shape data of the arbitrarily shaped groove (step Sl). The groove shape dividing unit 5 sequentially searches for shape elements from the groove shape start point of the machining shape line (step S2), finds the point (dividing point) at which the shape element changes from upward to downward, and determines the end of the shape element. Check whether the process has been completed (step S3), and if it has been completed, proceed to step S7. On the other hand, if the shape element is not completed in judgment step S3, the presence or absence of a dividing point is checked (step S4), and if there is no dividing point, the process returns to step S2. On the other hand, if there is a dividing point in judgment step S4, a straight line (dividing line) parallel to the X axis is generated from the dividing point (step S5), the intersection of this dividing line and the material shape line is found, and these lines are A region surrounded by is generated (step S6). Next, a tool path for the enclosed area is generated (step S7), and a check is made to see if the shape element has been completed (step S8). If the shape element has not been completed, the process returns to step S2. On the other hand, if the shape element is completed in the determination step S8, all processing is completed.

Next, a specific example of the method for generating the groove-shaped tool path will be described with reference to FIGS. 4(A) and 4(B).

FIG. 4(A) shows an example of an arbitrarily shaped groove.
When machining a groove shown by a shape line 8, shape elements are sequentially searched from a groove shape starting point 9, and dividing points 10 are determined. next,
Generate division line 11 and divide division line 11 and material shape line 1
The intersection point 13 of 2 is determined, and 41 divided areas are generated. The arrow in the same figure (B) indicates the tool 1 in this divided area 79 openings.
4 shows the path of point 15 on the left of the tip. The solid line indicates the cutting path, and the dotted line indicates the moving path. Since the machining order advances in the order of the chuck side (the side with the smaller Z value), that is, the divided area E-port, the processing is performed in the order of numbers ■-■-...-■.

This processing step will be explained below.

First, cut the groove bottom of divided area A (■), then cut the left side of divided area A (■), and then cut the right side of divided area A (■
). However, the R center of the tip of the tool 14 is set to be on the boundary of the dividing line 11 to prevent uncut parts.

Next, cut the bottom of the groove at the entrance of the divided area ■), the left side of the entrance of the divided area ■), the right side of the entrance of the divided area ■),
Finally, the remaining part of the divided area opening is cut (■) and the process is completed.

(Effects of the Invention) As described above, according to the groove-shaped tool path generation method of the present invention, it is possible to divide the machining area for forming grooves and find the tool path for each shape automatically. This makes it possible to machine grooves of any shape, which can significantly reduce the number of man-hours.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of an automatic programming device for a numerically controlled lathe that implements the method of the present invention, Fig. 2 is a flowchart illustrating the method of generating a groove-shaped tool path according to the present invention, and Fig. 3 is an arbitrary diagram. FIG. 4(A) is a diagram showing an example of a machining shape designation screen, FIG. 4(A) is a diagram showing an example of an arbitrary-shaped groove, and FIG. DESCRIPTION OF SYMBOLS 1...Keyboard, 2...CRT, 3...Manual control part, 4...Groove shape human power part, 5...Groove shape division part,
6... Tool path calculation section, 7... NC program. Tea 2 Giant vine 4

Claims (1)

[Claims] In the tool path generation method for machining the groove shape on a numerically controlled lathe, the groove shape data and tool width are read, the groove shape elements are automatically searched to find the parting line, and this parting line and the machining shape are A method for generating a groove-shaped tool path in a numerically controlled lathe, characterized in that a plurality of divided regions surrounded by lines and material shape lines are determined, and individual tool paths for the divided regions are determined.