JPH0322101A - Offset taper quantity changing method - Google Patents

Abstract

PURPOSE:To make a program path and an offset path correspond exactly to each other, and besides, to connect the offset path smoothly by inserting two circular arcs between an offset taper path before change and the offset taper path after the change. CONSTITUTION:This method is to insert two circular arcs between a first offset path OF11 and the program path P1 and a second offset path OF21, and these two circular arcs form an S-shape. Besides, the two circular arcs consist of a first insertion circular arc IA11 and a second insertion circular arc IA21, and start from a point Al which is the final point of the first offset path OF11 and terminate at the point C1 which is the starting point of the second offset path OF21. Then, the first insertion circular arc IA11 and the second insertion circular arc IA21 are connected to each other at the point B1. Thus, the pro gram path P1 and the offset path can be made to correspond exactly to each other, and even if offset quantity is large, the offset path can be smoothly connected.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for changing the amount of offset taper. [Prior Art] When changing the offset taper amount, there is a conventional method of inserting a circular arc of a predetermined radius between the offset paths (offset taper paths) before the change, as shown in FIG. In FIG. 7, the offset path is shown by a dotted line, and the program path is shown by a solid line. Note that among the offset amounts (offset taper amounts) between the program path and the offset path, the initial offset amount is defined as the first offset amount, and the offset amount after the change is defined as the second offset amount. Furthermore, as shown in FIG. 8, a method of smoothly connecting the offset amount change command arc (the part between the tapered paths where the offset amount is changed) using a straight line and a circular arc is also known. [Problems to be Solved by the Invention] As shown in Fig. 9, in the conventional method of inserting corner radii in the offset path before and after the arc in which the offset amount is changed, the shape of the corner R is inserted before and after the offset amount change command arc. There may be some affected parts. In other words, if part of the offset amount change command arc in the program path is a straight line, the offset path corresponding to this straight line will be a curve. Therefore, the conventional method described above has a problem in that the program path and the offset path do not correspond accurately. By the way, when the offset amount change command arc is formed into a straight line and a circular arc as shown in FIG. 8, there are cases where the offset path cannot be smoothly connected.
As shown in the figure, a problem arises in that the offset paths cannot be smoothly connected between two offset paths (between the offset path before the offset amount is changed and the offset path after the offset amount is changed). The present invention provides an offset taper amount changing method that allows accurate correspondence between the program path and the offset path when changing the offset amount, and also allows the offset path to be connected smoothly even if the offset amount is somewhat large. The purpose is to provide [Means for Solving the Problems 1] The present invention inserts two arcs between two offset paths. [Operation] Since the present invention inserts two circular arcs between two offset paths, it is possible to accurately match the program path and the offset path, and even if the offset amount is somewhat large, the offset path can be smoothed. You can connect to. [Example] Figure 1 is a diagram showing the basic idea of the present invention. In the following explanation, "offset taper path" will be referred to as "offset path" and "offset taper amount" will be referred to as "offset path".
This is called the offset amount. In the embodiment shown in FIG. 1, the program path P1 is a straight line;
advances from left to right in the figure, an offset amount change command is issued at that point }Sl, and that point }F
It is assumed that the above-mentioned offset amount change command ends at 1. Further, if the first taper amount T11 between the first offset path OF11 and the program path P1 is zero, and the second taper amount T21 between the second offset path OF21 and the program path P1 is as shown in the figure. do. In the above embodiment, two arcs are inserted between two offset paths, and in the above embodiment, two arcs are inserted between two offset paths.
The two arcs are S-shaped. In addition, in Fig. 1, the two arcs are the first insertion arc IAI 1 and the second insertion arc IAI 1.
21, starts at Boin}AI which is the final point of the first offset path OFII, and ends at point C1 which is the starting point of the second offset path OF21. The first insertion arc IAI1 and the second insertion arc IA21 are connected at a point }Bl. The center point of the first insertion arc IA21 is 011, and the center point of the second insertion arc IA21 is 021. Note that the offset amount change command OCI in FIG.
It is an infinite arc, and this infinite arc starts at Boin}Sl and ends at point F1. FIG. 2 (1) shows a case where an offset path is provided outside the program path P2, and this program path P2 has an offset amount change command arc OC2 in the middle thereof, and the first offset amount Tl2 is larger than the first offset amount Tl2. 2 shows a case where the offset amount T22 is large. In this case, points S2, F2 on the program path P2
correspond to boins }A2 and C2 on the offset path, respectively. FIG. 2(2) is an explanatory diagram of a method for determining the first insertion arcs IA12 and IA22 using the offset path shown in FIG. 2(1). When determining the first insertion arcs IA12 and IA22 shown in FIG. 2 (1), first draw the program path P2 as a straight line as shown in FIG. In figure (2), an infinite arc (straight line)
)'s start point }S2 and its end point}
F2 is divided into predetermined equal parts (in the above example, divided into 10 equal parts)
The equally divided points are dividing points D1 to D9.

Then, from the program path P2, the first offset}
iT12, separated by a second offset amount T22 and parallel to the program path P2, a first offset path OFl2.
A second offset path OF22 is drawn.

In the figure, a point above the program path P2,
Further above the point corresponding to point S2 of the first offset path OF12, (T2 2-T
Set the center point 012 at a point separated by l 2)/2. Also, above the program path P2, the second
A center point 022 is provided at a point located downward in the figure by (T22-T12)/2 from a point corresponding to point F2 of the offset path OF22. therefore,
The center points 012 and 022 are the straight program path P2.
The distances from will be equal. Then, a circular arc whose radius is the length from center point 012 to Boin}A2 is defined as point A
Draw counterclockwise from 2 to 90 degrees. This point is B2
shall be. Then, a circular arc whose radius is the length from the center point 022 to the point C2 is drawn counterclockwise at 90 degrees from the point C2, and stops at the point }B2.

Thereafter, the division point Di on the program path P2. D
2... Find the length from D9 to the above two arcs. These respective lengths are the lengths used in Figure 2 (3). In Fig. 2 (3), Boin}02 is Boin}S2
The vertical line of the program path PL in and Boin}F2
This is the intersection of the program path PL with the vertical line at .
Also, let the intersection angle of the above two vertical lines be θ, and draw nine dividing lines that divide this intersection angle θ into 10 equal parts. Each of these dividing lines is
Corresponds to division points D1 to D9. Then, in Fig. 2 (2), the first
Let d1 be a point on the dividing line (the dividing line closest to S2) and extending from the program path P2. In FIG. 2 (2), on the second division &i (the division &1 second closest to point s2) by the same length as the length from the division boin}D2 to the arc drawn on it, Let d2 be a point extending from the program path P2. Points d3 to d9 are obtained in the same manner. In addition,
Point d5 is the same as B2. By connecting the points d1 to d5 obtained in this way, the first insertion arc IA12 can be obtained, and the point d5 obtained above can be obtained.
By connecting .about.d9, the second insertion arc IA22 can be obtained. In order to find }di-d9 even more densely, the number of division points can be increased. By changing the offset amount as described above, it is possible to change the offset amount without changing the offset path of a straight program path to a curve. Therefore, it is possible to accurately match the program path and the offset path. FIG. 3 shows that in the above embodiment, an offset path is provided outside the program path P3, and the offset amount T13 of the first offset path OF13 is larger than the offset amount T13 of the second offset path OF23. This is a diagram showing the case. FIG. 4 shows that in the above embodiment, an offset path is provided inside the program path P4, and the offset amount T of the first offset path OF14 is
l4 is the offset iT of the second offset path OF24
24 is a diagram showing a case where the value is smaller than 24. FIG. 5 shows a case where, in the above embodiment, an offset path is provided inside the program path P5, and the offset amount T15 of the first offset path OF15 is larger than the offset } fi T 2 5 of the second offset path OF25. FIG.

In the case of the embodiments shown in FIGS. 3, 4, and 5, the first
Insertion arcs IA13, IAI4, IA15 and second insertion arcs IA23, IA24, IA25 can be obtained. FIG. 6 is a diagram showing a case where an offset path can be created smoothly even in the program path corresponding to the conventional example shown in FIG. In the above embodiment, the two circular arcs provided between the two offset paths are S-shaped, but instead, two circular arcs other than S-shaped may be used. [Effects of the Invention] According to the present invention, when changing the offset amount, it is possible to accurately correspond the program path and the offset path, and even if the offset amount is somewhat large, the offset path can be connected smoothly. This has the effect of making it possible to

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the basic concept when changing the offset amount in the present invention. Figure 2 (1) is
It is an explanatory diagram depicting a first insertion arc and a second insertion arc when an offset path is provided outside the program path, and (2) and (3) of the same figure are the same as those of the same figure (1). It is an explanatory diagram for finding the first insertion arc and the second insertion arc. Third
4, 5, and 6 are explanatory diagrams of other examples of the present invention. FIG. 7, FIG. 8, FIG. 9, and FIG. 10 are explanatory diagrams of conventional offset amount changing methods, respectively. P1 to P5...Program path, OFII to ○F16...lth offset path, OF2
1 to OF26...second offset path, IAI 1
~IA16...first insertion arc, IA21~IA2B・
...Second insertion arc, Tll-T16...First offset amount, T21-T26...Second offset amount, OC2
~OC6...Offset amount change command arc.

Claims (2)

[Claims] (1) In the method of changing the offset taper amount by changing the offset taper path and connecting the offset taper path before the change and the offset taper path after the change, the offset taper path before the change and the offset taper path after the change are A method for changing an offset taper amount, characterized by inserting two arcs between them. (2) The offset taper amount changing method according to claim (1), wherein the two arcs are S-shaped.