JP2686117B2 - Numerical control method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a numerical control method when performing die processing.

(Prior Art) In the die machining with a machine tool, although it has the same shape element such as draw type, trim type, blank holder type, etc., it is necessary to process the whole area and only a part of the shape is processed. In some cases At this time, when performing numerical control (NC) machining on dies with different machining ranges, NC data suitable for each machining range is created using CAD / CAM and automatic programming equipment to create NC data for the part corresponding to the machining range. At present, the method of making and the method of measuring the model and creating NC data limited to the processed part by the digitizing device are adopted.

Here, the mold processing by NC control will be described. In the trim type as shown in Fig. 6, when only the processed part of the upper surface is NC processed, as shown in Fig. 7, a large machining allowance assumed from the drawing is taken uniformly without looking at the workpiece (intersection). The shaded area). Therefore, in the movement of the tool when such a machining range is set, A ₂ and C ₂ shown in FIG. 7 correspond to the cutting feed of the actual cutting, and B ₂ corresponds to the rapid feed of the blank cutting.

FIG. 5 shows a block diagram of a conventional NC control method for die machining. The conventional method will be described below.

First, it was created in consideration of the processing range (cross hatched area)
NC data 2 ₁ , 2 ₂ ... 2 _n are prepared respectively and NC data input section 7
It is stored in the NC data storage unit 12 via. Next, a start command is given from the operation panel 1 to the NC data control unit 22 via the NC start unit 17 to read data from the NC data storage unit 12. The NC data control unit 22 sends a position command based on the read NC data to the control axis drive unit via the function generation unit 19.
The control axis drive unit 20 transfers the control axis 21 to
NC control.

In this way, the NC that was previously created considering the machining range
Data 2 ₁ , 2 ₂ , 2 ₃ ... 2 _n were prepared separately, and the NC data were directly input and controlled.

(Problems to be Solved by the Invention) As described above, in the conventional case, when the NC data for partial machining is created by using CAD / CAM, automatic programming device, digitizing device, or the like, actual machining is performed. Since it is difficult to program while looking at the machining allowance and machining area (see FIG. 6), it is often the case that the machining range is specified with a margin in consideration of the machining allowance.

Therefore, there has been a problem that the range of idle cutting during actual processing increases and the processing efficiency is poor.

The present invention has been made under the circumstances described above,
An object of the present invention is to reduce the load of data creation in CAD / CAM, automatic programming device, and digitizing device,
It is an object of the present invention to provide a numerical control method capable of efficiently performing partial machining of a mold.

(Means for Solving the Problem) The present invention relates to a numerical control method when performing die machining, and the above object of the present invention is to provide a region control condition that is a machining pattern such as skip machining or extraction machining. In the numerical control method of inputting the control conditions such as the tool return point and approach amount to the workpiece and creating the machining data for machining the workpiece, the NC machine is operated and the workpiece actually machined. By positioning on the contour forming the shape of, and creating and storing the area graphic data formed from the position data obtained by storing the position, by processing to the actually processed workpiece Numerical control data for full-area machining generated from the obtained part shape is input, and the area graphic data and the numerical control data for full-area machining are compared, and the input area Create machining area control data that controls the machining of the workpiece to be actually machined from the control conditions and control conditions, and perform partial machining control of the designated area according to the workpiece actually machined based on the machining area control data. Achieved by

(Operation) In the present invention, in order to set the area for switching from the cutting feed to the fast feed, the NR machine is operated to position at a specific position on the actual workpiece, and the position is stored to store the area graphic data. Compile the whole area numerical control data with the area graphic data, generate the processing area control data of the workpiece from the separately input area control conditions and control conditions, and use this processing area control data By performing the partial machining in conformity with the above, it is possible to eliminate wasteful cutting portions and perform efficient partial machining.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a numerical control method according to the present invention. FIG. 2 is a flow chart showing the procedure of the operation of the present invention. Figure 3 (A) and (B)
FIG. 4 is a diagram showing an example according to the method of the present invention. FIG. 4 is a diagram showing a case of a trim type.

In FIG. 1, an apparatus for realizing this numerical control method includes a recording button 22 for instructing storage of a current value, a current value storage section 3 for storing position data and a point NO. Of the current value data storage section 8 for storing the data, the current value data display section 13 for controlling the display of these data, the operation panel 1 for inputting the point NO. A figure data creating section 4 for inputting the point number and the point number and position data from the current value data storing section 8 and a figure data storing section 9 for storing the created data from the figure data creating section 4.
And a graphic data display unit 14 for controlling display of graphic data from the graphic data storage unit 9, a return point / approach amount setting unit 5 for inputting and setting a return point and an approach amount from the operation panel 1, and a return Return point / approach amount data storage unit 10 for storing data from the point / approach amount setting unit 5
And a return point / approach amount display unit 15 for controlling display of data from the return point / approach amount data storage unit 10,
The CRT 18 that displays the display data from the current value data display unit 13, the graphic data display unit 14, and the return point / approach amount display unit 15 and the skip machining / extraction machining distinction from the operation panel 1 and the graphic NO. Machining skip / extraction setting unit 6 that is input and set, area control condition data storage unit 11 that stores data from machining skip / extraction setting unit 6, NC data 2, and NC data to which NC data 2 is input Input section 7 and NC
An NC data storage unit 12 for storing NC data from the data input unit 7 and an NC start unit for inputting a start command from the operation panel 1.
17, graphic data storage unit 9, return point / approach amount data storage unit 10, area control condition data storage unit 11, NC data storage unit
12, and a machining area control unit 16 for inputting and controlling various conditions and data from the NC starting unit 17, and a function generating unit 19 for generating a function based on the control data from the machining area control unit 16. The control axis drive section 20 drives based on the function from the function generation section 19, and the control axis 21 driven by the control axis drive section 20.

 Next, the operation procedure will be described with reference to FIG.

First, position the NC machine at an approximate position on the workpiece by manual operation (MDI operation) using the operation panel 1, and input the point NO.
The data is stored in the current value data storage unit 8 (step S1). Next, the point number is input from the operation panel 1 and designated in the figure data creating section 4, and based on the designated point number, the point number and position data are read out from the current value data storage section 8 to obtain the figure number. And the area graphic are combined and created in the graphic data storage unit 9 (step S2). Further, the designated return point and approach amount are input from the operation panel 1 and set in the return point / approach amount setting section 5 (step S3).

On the other hand, NC data 2 created by CAD / CAM, automatic programming device, and digitizing device is used for NC processing.
The data is read into the data input unit 7 (step S4). Further, the area control condition data of the distinction between the skip processing and the extraction processing and the pattern NO. Is input from the operation panel 1 and set in the processing skip / extraction setting section 6, and further, they are set.
(Step S5).

After the above data setting is completed, a start command is input from the operation panel 1 to the NC start unit 17 (step S6). When the activation command is input and the NC device is activated, the machining area control unit 16 compares the X and Y values of the NC data for the entire area machining with the X and Y values of the area graphic data (step S7), Based on the control condition data, the designated return point, and the approach amount data, it is determined whether or not the region is within the extraction range (step S8). If the result of determination in step S8 is that it is within the extraction range, extraction processing is performed (step S10), and if it is outside the extraction range, skip processing is performed (step S9). Finally, it is determined whether or not all the NC data 2 for whole area processing has been completed (step S11). If not completed, step S7 and subsequent steps are repeated.

Finally, an example in which processing is performed by the above procedure will be described.

In the left diagram of Fig. 3 (A), based on the NC data for machining the entire area, the NC machine reads the part other than the machining range (skip range in the figure) from the actual workpiece and limits the machining range. Process parts. Further, in the areas other than the processing range, the skip operation is performed as shown in the right diagram of FIG. That is,
When the tool reaches outside the machining range, the tool is moved to the designated return point in the Z-axis direction, and the skip operation is performed by fast-forwarding to the start point of the machining range.

Further, in the example of FIG. 3 (B), NC for whole area machining
Based on the data, the NC machine specifies the machining range from the actual workpiece (extracted range in the figure) and performs partial machining. Also,
In the machining range extracted from the NC data for whole area machining, the tool is moved to that machining (extracting) range by rapid traverse to a specified position, and the speed is reduced from the position corresponding to the approach amount. Further cutting is performed (right view of (B)).

Further, in the case of the trim type illustrated in the related art, as shown in FIG. 4, the distance between the actual cutting and the cutting feed is shorter than that in the related art (A ₁ <A ₂ , C ₁ <C ₂ ), Cutting / rapid feed distance is long (B ₁ > B ₂ ). Therefore, it is possible to perform processing with higher efficiency than in the conventional case.

Incidentally, in FIG. 1, the range surrounded by the one-dot chain line corresponds to the range of the invention.

(Effects of the Invention) As described above, according to the numerical control method of the present invention, since NC data of the workpiece is created from the NC data for the entire area machining and the area graphic data obtained from the workpiece to be actually machined. ,
Since it is possible to specify proper machining skip range and machining extraction range while looking at the actual workpiece, efficient partial machining is possible, and by preparing only one type of total machining data, molds for various processes It can be applied to machining, reducing the load of data creation in CAD / CAM, automatic programming equipment, and digitizing equipment.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a numerical control method according to the present invention, FIG. 2 is a flow chart showing an operation procedure of the present invention, and FIGS. 3 (A) and 3 (B) are examples according to the method of the present invention. Fig. 4, Fig. 4 is a diagram showing a case where it is adopted in a trim type, Fig. 5 is a block diagram showing a conventional numerical control method, Fig. 6 is an explanatory diagram of processing of a trim type, and Fig. 7 is a conventional trim It is a figure which shows the case where a mold is actually processed. 1 ... Operation panel, 2 ... NC data, 3 ... Current value storage unit, 4 ... Graphic data creation unit, 5 ... Return point / approach amount setting unit, 6
… Processing skip / extraction setting part, 7… NC data input part, 8
... current value data storage unit, 9 ... graphic data storage unit, 10 ... return point / approach amount data storage unit, 11 ... region control condition data storage unit, 12 ... NC data storage unit, 13 ... current value data display unit, 14 … Graphic data display section, 15… Return point / approach amount display section, 16… Machining area control section, 17… NC starting section, 18… CR
T, 19 ... Function generator, 20 ... Control axis drive, 21 ... Control axis, 2
2… Record button.

Claims (1)

(57) [Claims] 1. Processing data for processing a workpiece by inputting area control conditions, which are processing patterns such as skip processing and extraction processing, and control conditions such as a tool return point and approach amount for the workpiece. In the numerical control method to create the, the NC machine is operated to position on the contour that constitutes the shape of the workpiece to be actually processed, and the area graphic data formed from the position data obtained by storing that position is used. The numerical control data for the entire area machining generated from the part shape obtained by machining the workpiece to be actually processed is input while the created and stored, and the area graphic data and the numerical control for the entire area machining are input. Comparing with the data, creating processing area control data for controlling the processing of the workpiece to be actually processed from the input area control conditions and control conditions, Numerical control method being characterized in that to perform the partial machining control of the designated area in line with the actual machining to the workpiece based on the control data.