JPS63316206A - Numerical controller - Google Patents

Abstract

PURPOSE:To execute a highly accurate processing without the remaining of cutting by providing a numerical control device to prepare an off-setting graphic in which an off-setting quantity is changed in accordance with the wall attribute of a workpiece, preparing a tool path, and working the closed area of a workpiece. CONSTITUTION:A picture 7 is selected and displayed on a CRT display 4, real and idle attributes can be inputted, a final processing shape is inputted by a coordinate value together with used tool data from a keyboard 3. Based on input data, an off-setting graphic 11 under consideration of tool diameters, wall attributes, etc., is prepared at the inside of a final processing shape 10 (not shown). Based on the graphic 11, a tool bus is prepared, and the workpiece is processed by a numerical control using a microcomputer. Then, in accordance with the wall attribute of the workpiece, the off-setting quantity is changed, for example, when the coupling is a recessed part, an off-setting shape is generated in which an idle part is shifted to the inside only by approximately 1/2 of the tool radius.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention automatically generates an offset figure by inputting the coordinates and machining conditions of the final shape, and generates a tool bus based on this offset figure. The present invention relates to a numerical control device for processing a closed region of a workpiece, and particularly relates to offset figure generation.

[Conventional technology]

A conventional numerical control device of this type will be explained with reference to FIG. 6('b) and FIGS. 7 to 18. 6) is a diagram showing a specific example of the desired workpiece, FIG. 7(b) is a diagram showing the hardware circuit configuration, FIG. 7(b) is a diagram showing the input screen, ) is a diagram showing the input shape, Figure 8 is a diagram showing the data structure of the RAM part of the memory, Figures 9 and 10 are flowcharts for explaining the operation, and Figure 11 is for explaining offset figure generation. Figure 12(a)
12 is a diagram showing a specific example of the generated offset figure.
Figure ■) is a diagram showing a specific example of the workpiece that was actually machined.
Figure 13) (1)) is a diagram for explaining the tool bus, and in Figure 7) (1) is the CPU, (2) is the CPU
A memory consisting of ROM and RAM containing a control program for controlling the U(1), a computer program, etc.
(3) is the keyboard for storing the Canadian program, coordinates, etc. in the memory (2), (4) is the Canadian program, the seventh
(To) CR'T display that displays the screen as shown in Figure Cζ, (5) is a servo mechanism that converts movement data sent from CPU (1) into pulses etc. that actually move the servo motor, ( 9) is a bus such as an address bus and a data bus, and the numerical control device is composed of the above. Further, (6) is a machine tool including a servo motor.

Next, the operation will be explained. That is, first, select and display the screen (7) shown in wS7 (in Fig. 7) on the CRT display (4), and input the machining conditions such as the data of the tools to be used from the keyboard (3) as shown in Fig. 8 (0). Input the final processed shape (8) using the key value. When the input is completed, the CPU (1) calculates the center of the arc, etc., and stores it in the memory (
2) A coordinate group is created in the RAM with a data structure as shown in FIG.

Note that the flag in this data structure is an area for storing information such as whether it is a stone line or a circular arc. Based on this input data, an offset figure αυ (point Q
, + to Q1 are connected by line segments) as shown in FIG. 9.

Note that the offset figure αD here refers to a shape in which the center of the tool must not protrude from this shape.

In FIG. 12, 03 is the workpiece, 03 is the tool, and (8) is the offset amount.

That is, in FIG. 9, the initial settings (step 101,
Generate the final machining figure αq based on the above data (Step 1
02) After checking, check the connections before and after a certain point (Step 1
04), and jumps to the corresponding processing flow according to the connected condition (step 105).

And when the connection is a slanted part, the first
Step 106A) to generate an offset shape as shown in FIG. 1(8), and when the connection is a convex portion, generate an offset shape as shown in FIG. 11(h) Step 106B), Furthermore, when the connection is a concave portion, an offset shape as shown in Figure 11 (0) is generated (step 106C). In addition, in FIG. 11, (A1) ~
The line segment indicated by (A8) indicates a part of the final processed shape, and the line segments indicated by (B1) to (B4) indicate a part of the offset shape. Also the above i! ! The part with a smooth knot is
To give a concrete example in FIG. 12, (B5) to (B7)
The part where the connection is concave is (Pl
) to (B4).

Next, the created offset shape is connected to the previous offset shape (step 107), and then the next point to be examined in the input shape is determined (step 108).

These series of processes are repeated until 98 figures are generated, and when the offset figure αυ is generated (step 108), a process is performed to remove the closed curve of the offset figure αυ (step 109). ,
Complete the generation of a complete offset shape (step 1)
10).

Note that removing the closed curve of the offset figure αυ in step 109 means that the offset D up to step 109 is removed.
Shape generation facilitates its off-seven shape generation,
An offset figure is simply generated on a single line when the final processed shape is reached, and depending on the shape of the final processed shape, unnecessary closed curves may occur, so the closed curves are removed.

After that, as shown in FIG. 10, the tool bus σ41 is generated based on the generated offset figure αB (step 111), other machining information is generated (step 112), and the machining information is transferred to the servo mechanism (step 112). 5) (step 118), the machine tool (6)
to control the noise of the workpiece.

Note that the tool bus q4 is
It may be created with a bus parallel to the axis or YIll, or it may be created with an offset bus as shown in FIG. 13 (to).

[Problems to be solved by the invention] The conventional number 1n control system is configured as described above.
The 12th
Since the offset figure αB was generated with a constant offset amount (8) as shown in Figure 6, for example,
) As shown in (IIl), if you want to obtain a corrugated workpiece mouth with a concave part with a partially open wall, even if you input the sitting image value and machining conditions of the final machining shape, the history of tool α:l is Due to the stop, P3-P4-P5 as shown in Figure 12(b)
There was a risk that parts like this would remain uncut.

This invention was made in order to eliminate the above-mentioned gap U point, and even when machining a workpiece having a recess with a partially open side wall, no uncut material is left. The purpose is to obtain a numerical control device.

[Means for solving problems]

The present invention provides means for generating an offset figure in which the amount of offset is changed in accordance with the wall attributes of the workpiece.

[Effect]

According to this invention, since the offset figure changes according to the wall attributes of the workpiece, it is possible to generate an optimal tool bus with no uncut parts.

[Embodiment of the Invention] An embodiment of the invention will be described below with reference to FIGS. 1 to 6, FIG. 8, FIG. 10, FIG. 11, and FIG. 13.

Note that FIG. 1(a) is a diagram showing the hardware circuit configuration, which is substantially the same as the conventional one. In addition, FIG. 1 (1)) is a diagram showing the input screen, FIG. 1 (C) is a diagram showing the input shape, and FIGS. 2 to 4 are flowcharts for explaining the operation.
Figure 5 is a diagram for explaining offset shape generation, sixth diagram) is a diagram showing a concrete example of the generated offset figure, and Figure 6(b) is a diagram showing a concrete example of the desired workpiece. It is. Also, parts that are qualitatively the same as those of the conventional one are given the same reference numerals.

That is, first of all, on the 0f (T display (4)
) is selected and displayed. As is clear from the figure, this screen (7) shows the wall attributes of the workpiece, that is, as shown in Figure 6 (to) (center wall portion (P5) to C?B);
The screen allows input by dividing the empty wall portions (P3) to (P5). Then, along with the tool data to be used, the final machining shape (8) as shown in FIG. 1 (0) is input using the coordinate values from the keyboard (3). At this time, each seat 53
The value represents the end point, but the wall attributes of the end point from the previous point are also input. For example, when inputting the shape shown in Figure 6(b), (P8)-(P4)-(P5) is "
A'', other cpl)-CF2)-<P3) and (P5
1(P6)-(P7)-(PL) is [WJ. Here, rAJ is an empty wall (A-R), and W is a real wall (WAL).
L ). A machining R is a part where it is better to cut somewhat beyond its boundary, and V/ALL is a part where it is absolutely forbidden to cut beyond that boundary. CPU (
1) creates the information of each point based on the input information of each point in the data structure shown in FIG. 8 as in the conventional method. At this time, if the first unused bit of the flag is round, the topmost bit is determined to be "1" as V/At, L, and if rOJ, it is determined as A/R.

Based on this input data, an offset figure u11 is created inside the final machining shape αQ as shown in FIG. 6(a), taking into account the tool diameter, wall attributes, etc., as shown in FIGS. Produced based on this.

That is, in Figures 2 to 4, the initial settings (step 1)
01), generates the final processed figure αQ based on the above data (step 102), then examines the wall attributes before and after a certain point (step 114), and jumps to the corresponding processing flow according to the wall attribute Cζ ( Step 115).

If the wall corrosion resistance is the same when connecting, perform steps 116 and 117, and 11.2FA.
When connecting objects of different gender, step 118゜1
19 processing is performed. When connecting walls with the same attribute (A-A
(or when WW is connected), the flow I troweling process as shown in FIG. 3 is performed. Step 116 A)
, and when the connection is a smooth part, Cζ is
As in the past, the offset shape is shifted inward by the tool radius as shown in Fig. 11(a) (when connected W-W),
Or, create an offset shape (when A-A is connected) that is shifted inward by approximately 1/2 of the tool radius.
A), and when the connection is a convex portion, an offset shape (at the time of W-W connection) shifted inward by the tool radius as shown in Fig. 11(b), or approximately - of the tool radius offset shape (A-A
Further, when the connection is a concave portion, an offset shape (w-w4 connection) shifted inward by the tool radius as shown in FIG. ), or generate an offset shape (when A-A is connected) shifted inward by approximately 1/2 of the tool radius (step 117C) 6 Also, when connecting things with different wall attributes (W-A, or A-W (when connecting) is performed as shown in Figure 4.In other words, the order of the connecting parts is m
step 118A), and then jumps to the corresponding processing flow depending on the connection status (step 11)
8BJ, and when the connection is a smooth part, step to generate an offset shape in which the empty wall (8) part is shifted inward by 1/2 of the tool radius as shown in Fig. 5(f). 119 A ), and when the connection is a convex part, ζ is 'g!' as shown in Figure 5 ('b). The wall (6) part is entangled by the radius of the tool 1/! Step 11: Generate an offset figure shifted inward by
9B), and when the connection is a concave portion, an empty wall (an offset shape in which the slope portion is shifted inward by approximately 1/2 of the tool radius) as shown in FIG. 5(C) is generated, Finally, after standardizing the arrangement of the connecting parts, the arrangement of the off-7' soto shape is reversed (step 120).

Note that the reason why the arrangement of the connecting portions is standardized in step 118A, that is, the reason why the connection of A-W is unified to W-A, for example, is to facilitate generation of an offset shape.

It should be noted that the subsequent processing is the same as that of the conventional method, so the explanation will be omitted. Therefore, as shown in Figure 6, the offset shape processed in this way, the actual wall surface part, that is, (P
5) - (P3) portions are shifted inward by the tool radius,
Also, the empty wall (8) portion, that is, the portions (P3) to (P5), has a shape shifted inward by 1/2 of the tool radius,
Since the tool bus 04 is generated based on this offset figure, it is possible to obtain a desired workpiece without any uncut parts, as shown in FIG. 6(1)).

[Effects of the Invention] As described above, according to the present invention, a means for generating an offset figure whose offset amount is changed according to the wall attributes of the workpiece is provided, so that the desired workpiece can be Even if the shape has a partially open recess, it is possible to perform highly accurate machining without leaving any uncut parts.

[Brief explanation of the drawing]

FIGS. 1 to 6 are diagrams for explaining one embodiment of the present invention, and FIG.
(to) is a diagram showing the input screen, Figure 1 (0) is a diagram showing the input shape, Figures 2 to 4 are flowcharts to explain the operation, and Figure 5 is a diagram to explain offset figure generation. Figure 6(a) is a diagram showing a specific example of the generated offset figure, Figure 6('b) is a diagram showing a specific example of the desired workpiece, and Figure 6(a) is a diagram showing a specific example of the desired workpiece. 8 is a diagram showing the data structure of the RAM portion of the memory according to the present invention and the conventional device; FIG. 9 is a flow chart for explaining the operation of the conventional device; FIG. 10 is a diagram showing the hardware circuit configuration; Flowchart for explaining the operation of the present invention and the conventional device, FIG. 11 is a diagram for explaining offset figure generation of the conventional device, vg12 FIG. 0. ) is a diagram showing a specific example of an offset figure generated by the conventional device, FIG. 12(b) is a diagram showing a specific example of the workpiece processed by the conventional device Cζ,
FIG. 18 is a diagram for explaining the tool bus of the present invention and the conventional device. In addition, the same reference numerals in the figures indicate the same or equivalent parts, @ is the workpiece, (8 is the offset amount, α1) l is the offset figure, a! @ is a tool bus.

Claims (2)

[Claims] (1) When machining a workpiece whose final shape has a recess with a part of the side wall open, the desired offset amount can be calculated by inputting the coordinates and machining conditions of the final shape. Along with generating shapes,
Generate a toolbus based on this offset shape and
A numerical control device for machining the workpiece, characterized in that the numerical control device is provided with means for generating an offset figure with an offset amount changed in accordance with a wall attribute of the workpiece. (2) The means for generating an offset figure includes a means for determining whether the wall attribute of the workpiece inputted from the input means is a real wall or an empty wall, and a means for determining whether the wall attribute of the workpiece determined by this means is an empty wall. 2. The numerical control device according to claim 1, further comprising means for generating an offset figure by reducing an offset amount in the case of a wall compared to the case of a real wall.