JPH06104292B2 - Method and device for automatically dividing machining process in automatic programming device - Google Patents

Description

The present invention relates to a method for automatically dividing machining steps of an automatic programming device. More specifically, in an interactive automatic programming device that automatically creates turning NC data, the machining process is divided into the first machining process (front surface machining) and the second machining process (back surface machining) based on the finish shape of the workpiece. The present invention relates to a method for automatically dividing a machining process of an automatic programming device that automatically divides.

[Prior Art] In NC machine tools, a tool path is instructed by a program (NC data). This path is manually programmed. This manual programming, that is, a method in which a person calculates a tool path and programs it requires a lot of man-hours for programming. In recent years, in order to reduce the programming man-hours, an automatic programming device has been used which inputs data interactively using a CRT screen and creates NC data by a simple operation from a part drawing. Various methods for automatically creating NC data for turning have been proposed and implemented.

For example, Japanese Patent Laid-Open No. 61-103213 discloses an NC data creation method capable of automatically determining a necessary machining process sequence and machining area from pre-classified material shape data and finishing shape data. Has been done.

[Problems to be Solved by the Invention] In the NC data creation method described above, the order of processing steps is automatically determined. However, in recent years, a type of NC lathe having two spindles facing each other has appeared. This type of NC lathe holds the work piece by the first spindle chuck and processes the surface of the work piece, and then receives and holds the work piece by the second spindle chuck and processes the back surface of the work piece. ing. In order to create NC data of the first processing step for processing the surface and the second processing step for processing the surface with the automatic programming device, the operator can use the past experience from the drawings to make the first processing step and the second processing step. It was created by dividing it into processes and inputting data such as finish shape for each process.

For this reason, only those who are familiar with the turning process can create it. Moreover, since data such as finishing shape is input for each process, the efficiency is poor. The present invention has been invented in such a technical background and achieves the following objects.

It is an object of the present invention to provide a machining process automatic dividing method in an automatic programming device for automatically discriminating the first and second machining processes by once inputting a material shape and a finishing shape.

[Means and Actions for Solving the Problems] The following means are adopted to solve the problems.

A method for automatically dividing a machining process, which is an input process for inputting a contour line of a material shape of a work piece and a finish shape inputting for inputting a contour line of a finish shape of a work piece. A step, a step of defining an input start point of the finish shape, a step of defining the maximum outer diameter on the finish shape, and a position farthest from the end surface of the finish shape in the rotation axis direction of the workpiece. A step defined as a division point, a contour line of the material shape, a contour line of the finish shape, a line orthogonal to the rotation axis line passing through the input start point, and a line orthogonal to the rotation axis line passing through the process division point The step of determining the area surrounded by the first processing step area and the area other than the above as the second processing step area
A method for automatically dividing a machining process in an automatic programming device comprising a process defined as a machining process region.

In addition, a preset length from the input start point is added in the axial direction so that the first machining step area and the second machining step area are added.
If the processing step area is determined by having an overlapping processing area that overlaps the processing step area, the processing and finishing accuracy is good.

In order to realize this method, a material shape storage memory area for storing the contour line of the material shape of the work piece, a finish shape memory memory area for storing the contour line of the finish shape of the work piece, and the finish shape An input start point memory area for storing the input start point, and a position having the maximum outer diameter of the finishing shape which is farthest from the end face of the finishing shape in the rotation axis direction of the workpiece are determined as the outer diameter process dividing point. A region surrounded by a contour line of the material shape, a contour line of the finish shape, a line that passes through the input start point and is orthogonal to the rotation axis line, and a line that passes through the outer diameter process dividing point and is orthogonal to the rotation axis line. Is a first machining step area, and a region other than the above is a second machining step area, a control program memory area, the material shape memory memory area, the finish shape memory memory area, and the input start point memory area. And control professionals A central processing unit that integrally controls the Ramumemori region, the machining step automatic splitting device in the automatic programming apparatus comprising a used.

[Embodiment] Automatic Programming Device FIG. 1 is a block diagram showing an embodiment of the automatic programming device of the present invention. Central processing unit (CP
U) 1 controls and controls the entire automatic programming device. A graphic display device 3 and an input device 4 including a keyboard device are connected to the CPU 1 via a bus 2. Processing information memory area 5
Is an area in the RAM, and information about the workpiece such as the material shape, finish shape, and input start point of the workpiece is stored in each memory area 51, 52, 53.

The control program memory area 6 includes a control program for controlling the entire automatic programming device, a program for creating NC data from information on a workpiece stored in various memory areas, a program 61 for dividing a machining process, and other necessary programs. This is the area in the ROM to store. The NC data output device 7 is an output means for outputting the created NC data to an external storage medium such as a paper tape, a bubble cassette, and an IC card.

The condition setting memory area 8 is NC by an automatic programming device.
An area in RAM that stores various conditions such as cutting conditions used when creating data. Created data memory area 1
0 is an area in the RAM that temporarily stores the input data, the processing result, the created NC data, and the like.

Example of Method for Determining Machining Steps Solid lines shown in FIGS. 2 (a), (b), and (c) are half sectional views showing an example of the finished shape at the time of turning.

Embodiments of the present invention will be described below with reference to the drawings.
The solid line of the arrow in FIG. 2 (a) shows the shape of the contour line of one section cut from the finishing shape axis of the component 20 having the through hole 21 therein, and the outer dotted line is the contour line of the material 22 shape. Is shown. The contour line of the shape of the material 22 is input from the input device 4 according to the message displayed on the graphic display device 3.

The input contour shape of 22 shapes is the material shape memory area
It is stored in 51. Point A is an input start point of the contour line of the finished shape. This input start point A is a division point on the inner hole 21 side that distinguishes the first machining process and the second machining process. Therefore, the input starting point A on the inner hole 21 side is manually determined in consideration of this. However, since the inner hole 21 is a through hole, the drilling process is performed in the first processing step.

Next, from the input start point A, line segment AB , line segment BC , line segment CD ,
Enter line segment DE , line segment EF , line segment FG , line segment GH , line segment HI , line segment IJ , line segment JK , line segment KL , line segment LM , and line segment MA . By this input, the input start point and the finish shape are the finish shape memory
Stored in 52. When the input of the finish shape is completed, the machining step division program stored in the machining step division program memory area 61 in the control program memory area 6 is stored in the CP.
It is executed by U1 to automatically determine the division position for the first and second machining steps. A method of determining the division position by the machining step division program will be described below. The process division position is the material 22 stored in each area 51, 52, 53 in the processing information memory area 5.
On the side of the inner hole 21 such as the shape and finish shape input starting point A, the input starting point A is used as a dividing point as described above. However, in actual cutting, since there are burrs and uncut portions corresponding to the nose R at the boundary between the first and second machining steps, the length l is added in the Z direction from the input start point A, and even in the first machining step. The overlapping processing area 23 to be added in the second processing step is defined.

The length 1 of the overlapping processing area 23 is set in advance in the condition setting memory area 8 in the automatic programming device. The dividing point between the first machining step and the second machining step on the outer diameter side is automatically determined according to the following principle. At the position where the outer diameter of the entered finish shape is the largest, that is, the position where the X value is the largest,
Further, the position having the smallest Z value, that is, the H point is set as the division point. Similarly to the inner hole 21 side, the overlapping length l of the first processing region 24 and the second processing region 25 is determined in advance on the outer diameter side, and this value is added.

After all, in the first processing step 24, as shown in FIG. 2 (b), on the inner hole 21 side, a line segment L passing through the point A + () and parallel to the X-axis line.
1, on the outer diameter side, a line segment L2 that passes through point H + () and is parallel to the X axis
It is the side with a large Z value, which is surrounded by and the outline of the finished shape and the shape of the material 22. As shown in FIG. 2 (c), the second processing step region 25 is a region extended by the length () toward the remaining region plus the first processing step. That is, the area surrounded by the length l, the finishing shape line, and the outline of the material shape is the first
The processing step area 24 and the second processing step area 25 become an overlapping processing area 23 where they overlap.

3 (a), (b) and (c) show other processing examples.
First, the input starting point A of the inner hole 21 is first determined. If it is determined that the processing start point is the point A, input is started from the line segment AB . Next, line segment BC , line segment CD , arc DE , line segment EF , line segment FA
Enter. The division points of the first and second processing steps are determined in the same manner as in the processing example. That is, point A is on the inner hole 21 side and G is on the outer diameter side.
It is a point. Similar to the above, the length l of the overlapping processing area 23 in the Z direction
Is determined, the position where the length l is added in the Z-axis direction is set as the first machining step region. Therefore, the first
The two machining process areas 24 and 25 and the overlapping machining area 23 are shown in FIG.
The area is shown in (c).

FIG. 4 shows an example having a blind hole 30. The processing start point is point A, and line segment AB , line segment BC , line segment CD , line segment DE , line segment E
F , line segment FG .... Similarly, enter up to point P. In this case A
Since the point and the point P do not intersect, the inner hole is recognized as the blind hole 30. At the time of this recognition, on the inner hole side, the overlapping processing area 23 as in the above-described processing example is not adopted and the length l in the Z-axis direction is not set. However, on the outer diameter side, the length 1 from the point G, which is the maximum outer diameter, is set, and the overlapping processing area 23 is set. Therefore, the first processing step region 24 becomes the region shown by the diagonal lines in FIG. The second processing area is defined in the same manner as above.

FIG. 5 is a processing example having no inner hole at all. Input points A to K. In this case, since there is no inner hole, the overlapping machining area 23 is added and the area surrounded by the finish shape and the material shape is defined as the first machining step area 24. The second processing step area 25 is defined as described above.

Schematic Operation Flow Diagram FIG. 6 is a flow diagram of process division. First, the material shape is input from the input device 4 of the automatic programming device (step P ₁ ). The input material shape is stored in the material shape storage memory area 51 in the processing information memory area 5.
Next, the finish shape is input in the procedure as shown in the processing example (P ₂ ). The entered finish shape is stored in the processing memory area 5
It is stored in the finish shape memory memory area 52 therein. The input start point of the finished shape is stored in the input start point memory area 53. When the input of the finish shape is completed, the CPU 1 executes the control program 61 and starts the process division processing.

If necessary the process division (P _3), and terminates the processing of process division (P _4), to create automatically a conventional NC data (P _4). Whether or not this process division is necessary is input in advance. If there is a process division, it is judged whether or not there is a process division designation designated by the operator (P ₅ ), and the first and second machining process areas are divided at the designated position (P ₆ ).

On the other hand, when there is no process division designation input, the process division position is automatically determined according to the above principle, and the first and second machining process regions are divided at this position. (P ₇ , P ₈ ). When the division is completed, the first and second material in each process, writing finish shape to create the data memory area 10 (P _9). Thereafter, to display the original on the material shape and finish shape of the first and second step the shape data written in these create the data memory area 10 on the display device 3 (P _10).

When the operator determines that the process dividing position from the finish shape appears unsuitable (P _12), it can be by keyboard input corrected from the terminal (P _13). When the process division process is completed, NC data is automatically created from the finish shape and material shape for each of the first and second processing steps, as in the conventional method.

[Effects of the Invention] As described above in detail, since the machining areas of the first and second machining steps are automatically divided from the input start point, the finish shape and the material shape, even a person with little machining experience can efficiently perform the first operation. , 2 machining areas can be determined.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of the NC data creation device,
2 (a), (b), and (c) are diagrams showing an example in which a process is determined based on the finish shape and material, and FIGS. 3 (a), (b), and
(C) is a view showing recognition when a curved surface has a shape, and FIG. 4 is a view showing an example of a finished shape of a workpiece having a blind hole,
FIG. 5 is a diagram showing an example having no inner hole, and FIG. 6 is a diagram showing an operation flow for determining a process. 1 ... Central processing unit, 3 ... Graphic display device, 4 ... Input device, 5 ... Machining information memory area, 6 ... Control program memory area, 8 ... Cutting area memory area, 9 ...
Machining process memory area, 24 …… First machining process area, 25 …… Second machining process area

Claims (3)

[Claims] 1. A method for automatically dividing a machining process, comprising a step of inputting a contour line of a material shape of a workpiece and a contour line of a finish shape of the workpiece. A finishing shape input step of inputting, a step of defining an input starting point of the finishing shape, a maximum outer diameter on the finishing shape, and farthest from the end surface of the finishing shape in the rotation axis direction of the workpiece. A step of defining the position as an outer diameter process dividing point, a contour line of the material shape, a contour line of the finishing shape, a line orthogonal to the rotation axis line passing through the input start point, and the rotation axis line passing through the process division point A method for automatically dividing machining steps in an automatic programming device, comprising: a step of defining a region surrounded by a line orthogonal to the first machining step region; and a step of defining a region other than the above as a second machining process region. 2. The method according to claim 1, wherein the preset length from the input start point is added in the axial direction.
A machining step automatic dividing method in an automatic programming device, wherein the machining step area is determined by having an overlapping machining area where the machining step area and the second machining step area overlap. 3. A material shape storage memory area for storing a contour line of a material shape of a workpiece, a finish shape memory memory area for storing a contour line of a finish shape of the workpiece, and an input starting point of the finish shape. And an input start point memory area for storing, and a position that is the maximum outer diameter of the finish shape and is farthest from the end face of the finish shape in the rotation axis direction of the workpiece is determined as the outer diameter process dividing point, and the material A region surrounded by a contour line of the shape, a contour line of the finish shape, a line that passes through the input start point and is orthogonal to the rotation axis line, and a line that passes through the outer diameter process dividing point and is orthogonal to the rotation axis line is first. A control program memory area for determining a machining step area and an area other than the above as a second machining step area, the material shape memory memory area, the finishing shape memory memory area, the input start point memory area, and the control program memory A central processing unit that integrally controls the frequency, processing step automatic dividing device in the automatic programming apparatus comprising a.