JPH047711A - Automatic tool route creating device - Google Patents

Abstract

PURPOSE:To automatically create a tool route for machining a ring type cutting work face by drawing the shortest partition line from respective bent points of the outside and inside outlines of the ring type cutting work face to respectively opposed inside and outside contour lines, calculating the center points of respective shortest partition lines and connecting respective respective center points in the order of partition arrangement. CONSTITUTION:This automatic tool route creating device 30 is a computer itself in the viewpoint of hardware and is provided with a microprocessor 31, a clock signal generating circuit 32, a ROM 33, a RAM 34, a hard disk 35, and interfaces 36, 37. The bent points of outside and inside outlines are selected from the working specification data of the ring type cutting work face and the shortest partition lines are drawn from the bent parts to respectively opposed inside and outside contour lines to partition the cutting work face. The center points of respective shortest partition lines are calculated and respective calculated center lines are connected in the order of partition arrangement to create a ring type route. Thus, the tool route for machining the ring type cutting work face can be automatically formed.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention provides an apparatus for automatically creating a tool path for cutting a ring-shaped cutting surface surrounded by an outer contour line and an inner contour line. It is related to.

"Prior Art" Conventionally, surface machining of a two-dimensional shape is usually performed based on NC data created by an automatic plumber. Automatic programming equipment automatically starts programming when the operator specifies the machining area based on the machining drawing and inputs information on which tool to use and in what direction to cut each machining area. and create NC data.

``Problems to be Solved by the Invention'' However, the cutter path p created by the automatic plumming device is generally one in which the tool diameter d is partially overlapped and sequentially translated in parallel on a straight line, as shown in Fig. 11. be. Therefore, when a ring-shaped machined surface surrounded by the outer contour line 0 and the inner contour line i, as shown by the two-dot chain line in the same figure, is cut using NC data created by the automatic plumming device, the inner contour line There is a problem that there is idle cutting inside the line, which wastes time and reduces work efficiency.

Of course, it is possible for a worker to create NC data for cutting a ring-shaped machined surface based on the required processing data, but this is dependent on the worker's experience, is burdensome, and is slow. The problem is that it lacks.

The present invention has been made to solve the above problems, and provides an automatic tool path generation device that automatically creates a tool path for cutting along a ring-shaped cutting surface. The purpose is to

"Means for solving the problem" As a specific means to achieve the purpose described in E, a ring-shaped machined surface surrounded by an outer contour line and an inner contour line, which are input as machining specification data, is memorized. a data storage means for selecting a bending point of an outer contour line and an inner contour line from the processing specification data, and dividing the section by drawing the shortest division line from the bending point to the opposing inner contour line and outer contour line, respectively; means, midpoint calculation means for calculating the midpoint of each of the shortest compartment lines, and route creation means for creating a ring-shaped route by connecting each of the calculated midpoints in the order in which the compartments are arranged. An automatic tool path generation device is provided.

“Function” The function of the automatic tool path generation device described above is as follows.
The partitioning means selects each bending point of the outer and inner contour lines from the machining specification data of the ring-shaped cutting surface stored in the data storage means, and draws the shortest partition line to the opposing inner and outer contour lines, respectively. . After the midpoint calculation means calculates the midpoint of each of the shortest division lines, the route creation means connects the midpoints in the order of the divisions to create a ring-shaped route.

“Example J Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an automatic tool path generation device and a machine tool connected thereto.

The machine tool 20 is connected to a numerical control device 110, and an automatic tool path generation device 30 is connected to the numerical control device 10.

The numerical control device IO has a servo motor drive #J circuit DUX.
, DUY, DUZ sequence controllers 11 are connected via a closed interface. In the machining center type machine tool 20, by the rotation of the servo motors 22, 21, and 23 driven by the servo motor drive circuits DUX, DUY, and DUZ, respectively,
The relative position between the workpiece table 25 that supports the workpiece W and the spindle head 24 that supports the spindle 26 driven by the spindle motor SM is three-dimensionally changed.

In addition, in the tool magazine 27 that holds a plurality of types of tools, the tools in the tool magazine 27 are selectively mounted on the spindle 26 by a closed magazine indexing device and a tool changing device 28, so that the workpiece W can be machined. It will be done. Further, a main shaft motor drive circuit 15 that controls the rotational speed of the main shaft motor SM is connected to the sequence controller 11.

In terms of hardware, the tool path automatic generation system FIT 30 is a computer itself, with a microprocessor 31.
．． Clock signal generation circuit 32. ROM33, RAM34
．． A hard disk 35 is provided with interfaces 36 and 37, and a keyboard 38 and three CRT display devices are connected to the interface 36.

Each means constituting the automatic tool path generation system 'R30 is realized as processing in the microprocessor 31.

FIG. 2 is a flowchart of the main routine showing an outline of the processing of the microprocessor 31.

When the process starts, the tool diameter is input from the keyboard 38 on the Stella 7101. In the subsequent step 102, a process is performed to determine the maximum width between the outer and inner contour lines of the ring-shaped cutting surface. The outer and inner contour lines of the ring-shaped cutting surface are stored in the hard disk 35 as machining specification data.

Then, the process proceeds to step 103, where the tool diameter and maximum width are compared, and when it is determined that the maximum width is greater than the tool diameter, step 104
It ends as uncuttable. When it is determined that maximum width ≦ tool diameter, it is determined that cutting is possible in step 105, and the process proceeds to step 106. In step 106, a tool path creation process is performed, and then the process proceeds to step 107, in which the tool path is simplified and processing is performed. finish.

FIGS. 3A and 3B are flowcharts showing details of the process for determining the maximum width between the outer and inner contour lines of the ring-shaped cutting surface shown in step 102 above. Fourth
This will be explained below with reference to the diagram and the explanatory diagram of FIG.

In step 201, variables i and j are set to 1, and in step 202, the shortest division line al is drawn from the bending point Xl of the outer contour line Lo to the inner contour line Li, as shown in FIG. Then, in step 203, 1 is added to the variable i, and in step 204, as in step 202, the outer contour line Lo
Draw the shortest division line a from the bending point x1 to the inner contour line Li, and then in step 205 draw a compartment surrounded by the shortest division line al-1 drawn in step 202 and the shortest division line a1 drawn in step 204. is the bending point Y of the inner contour line L1,
It is determined whether it exists. If it exists, proceed to step 206, draw the shortest division line from the bending point Y of the inner contour line L1 to the outer contour line Lo, add 1 to the variable j in step 207, and return to step 205. Thereafter, the process continues until there is no bending point Yj within the partition lines a + and a l-1, and the process proceeds to step 208. Then, in step 208, it is determined whether the shortest division line has been drawn from all the bending points, and if not, the processes from step 203 to step 207 are repeated. It shall include the start and end of the line.

In this way, the bending point Xx2 of the outer contour line Lo...
The shortest division line al from each of Xl to the inner contour line Li
+ a 2...a, are drawn, and the shortest division lines bI, b,... are drawn from each of the bending points Y,, Y,...Y, of the inner contour line Li to the outer contour line Lo. bj is drawn, and this shortest division line a+ + a t...at, b+b
The area partitioned by z...b is partition N + ,
N2...N, and the process proceeds to step 209. In step 209, each of the wards MN, , N2 . N
,...For all sections of N7, step 2 ], O
Perform the following processing. In step 210, it is determined whether at least one of the outer contour line Lo and inner contour line L1 of the section includes a convex arc. If a convex arc is included, the variable f is set to 1 in step 211, and the midpoint m of the partition lines at and b4 is set in step 212 as shown in 5th [ ] (A).
Find the intermediate line a that connects +, m 2, and use this intermediate line a
is moved in parallel to the outer contour line Lo direction and the inner contour line Li by the tool diameter d. Then, in step 213, the parallel-translated intermediate line a is divided into the outer contour line Lo and the inner contour line Li.
is determined to intersect with, and if it is determined that it intersects, step 2
The process proceeds to step 14, and if it is determined that they do not intersect, the process proceeds to step 217, where the maximum width of that section is set as the tool diameter d. Step 2
In step 14, it is determined whether the variable f is smaller than 3, and if it is determined to be larger than 3, it is determined that cutting is impossible and the process is terminated. If the variable f is less than 3 in step 214, step 2
At step 15, a dividing line C is drawn passing through the points bisecting the intermediate line a as shown in FIG. 5(B), and at step 216,
Add 1 to kf and return to step 212. Step 21
8, the maximum width W in each section, 1. Save each.

In a section whose outer or inner contour line does not include a circular arc, the shortest section line has the maximum width W m a y. The process returns when steps 210 to 218 are completed for all sections.

FIG. 6 is a flowchart showing details of step 106 (tool path creation processing) shown in the main routine (see FIG. 2). This will be explained below with reference to the explanatory diagram of FIG.

First, in step 301, each section N, , N2 . Compartment line al + al of N, -...N,
+av ” ' a + and bl+ b2. b2-
--bJ (1) Each midpoint nn2 + n 2...n,,
Calculate. Then, in step 302, each midpoint nl
+ n 2+ n , . . . nh are connected in the order of arrangement of each section to create a tool path (see FIG. 7), and return.

FIG. 8 shows step 107 shown in the main routine above.
12 is a flowchart showing details of (tool path simplification processing). This will be explained below with reference to the explanatory diagram of FIG.

First, in step 400, the variable k is set to 1, and in step 40
1, the reference section N and the reference midpoint 11w are set. Next, the process proceeds to step 402, where the envelope line M, which is the diameter of the tool when the tool center is moved along the straight line segment, is determined. In step 403, the sections N, , N, . . . N8. It is determined whether or not Wu is included within the envelope M1. If included, in step 404, = is set to +1 and the process returns to step 403. If not included, step 40
In step 5, the line segments n f and n w−*w−+ are set as tool paths,
Midpoint ny + l + n ++ ” 1 '...n
8 and yaw to simplify the tool path.

Then, in step 406, it is determined that the number of sections n<k, and YES
If so, it is assumed that the tool path shortening process has been completed for all sections and the process returns. If NO, step 40
In step 7, X=X+ is set to -1 and the process returns to step 401. That is, the reference section N.

is moved to the section Nw+m-1, and further the reference midpoint n is moved to the midpoint n and v-+, and the above steps 402 and subsequent steps are performed to obtain the midpoint n. 0. A simplification process is performed on the tool path created by connecting -1 and below. FIG. 10 shows a tool path L' created by the tool path simplification process.

The tool path L' created as described above is output as NC data to the numerical control system W, 10, and the tool center is moved along the tool path L'' to perform cutting on the workpiece W.

"Effects of the Invention" Since the present invention is configured as described above, it is possible to automatically create a ring-shaped tool path for cutting a ring-shaped cutting surface along the cutting surface. Therefore, machining time can be shortened and work efficiency can be increased.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the automatic tool path generation device, Figure 2
The figure is a flowchart showing the processing in the processor, FIGS. 3(A) and (B) are flowcharts showing the processing for determining the maximum width of the ring-shaped cutting surface, FIGS. 4 and 5(A),
(B) is an explanatory diagram, FIG. 6 is a flowchart showing the tool path creation process, FIG. 7 is an explanatory diagram, FIG. 8 is a flowchart showing the tool path simplification process, and FIGS. 9 and 10 are explanations. FIG. 11 is an explanatory diagram showing a conventional tool path for a ring-shaped cutting surface. 30., Automatic tool path generation device, 311. Microprocessor, 33. ,,ROM, 34 ,,,RA
M, Lo, , Outer contour line, L i, , Inner contour line, Lo, Tool path, a,, bJ, , Shortest division line,
Nl, N2...N,...,, partition, l'l I,
n 2・”n h, - midpoint. Fig. 2 Patent applicant Toyota Machinery Co., Ltd., 1. Agent Patent attorney Yusaku Goto Figure Figure Figure

Claims (1)

[Claims] a data storage means for storing a ring-shaped cutting surface surrounded by an outer contour line and an inner contour line inputted as machining specification data; dividing means for selecting and dividing by drawing the shortest division line from the bending point to the opposing inner contour line and outer contour line; midpoint calculation means for calculating the midpoint of each of the shortest division lines; An automatic tool path creation device comprising path creation means for creating a ring-shaped path by connecting midpoints in the order of the sections.