JP2599206B2 - Numerical control information creation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention inputs a shape after processing and a shape before processing,
The present invention relates to a numerical control information creation device that creates numerical control information from a shape after processing and a shape before processing.

(Prior Art) FIG. 8 is a block diagram showing functions of a numerical control information creating device according to a conventional technique.

Such a conventional numerical control information generating device inputs data from the outside by a data input device 1 and inputs pre-machining shape data MF, post-machining shape data MA and process-specific tool shape data PT via a data input unit 2. It has a pre-machining shape storage unit 3, a post-machining shape storage unit 7, and a process-specific tool shape storage unit 6 for storing the respective shapes. Then, the pre-machining shape MFA from the pre-machining shape storage unit 3 is divided for each process, and the pre-machining shape dividing unit 4 for creating the pre-machining shape MFB for each process and the process-unprocessed shape MFB created here are stored. A post-processing shape storage unit 5 and a post-processing shape division unit 8 that divides the post-processing shape MAA from the post-processing shape storage unit 7 for each process and creates a post-processing shape MAB. Shape before processing MA
And a post-processing shape storage unit 9 for storing B. Further, a display control unit 12 for selecting and controlling data to be displayed on a display device 14 such as a CRT via a display data output unit 13
And the shape before processing from the shape storage unit 5 before processing, the shape after processing from the shape storage unit 9 after processing from the shape storage unit 9 after processing, and the tool shape for each process from the tool shape storage unit 6 for each process. Numerical control information creating unit 10 that creates numerical control information by inputting the created numerical control information
15, a magnetic disk 16, a numerical control information output unit 11 for outputting to the outside in the form of a communication signal 17, and the like.

In such a conventional numerical control information generating apparatus, in order to determine a processing step when a concave shape is present in a post-processing shape, first, a tool shape for each step must be determined so that a portion other than a blade of a tool does not interfere with a workpiece. A region formed by a point where the straight line passing through one entrance point of the concave portion and the concave portion intersect with the inclination of the sub cutting edge angle of the forward cutting tool stored in the storage section 6 is defined as a machining process by the forward cutting tool. The remaining portion of the concave portion is a processing step using a reverse cutting tool. That is, as shown in FIG. 9, in the concave portion having the outer diameter, the region R1 is a processing step for cutting with the forward cutting tool T1, and the region R2 is a processing step for cutting with the reverse cutting tool T2. In the concave portion on the end face, the region R3 is a machining step for cutting with the forward cutting tool T3, and the region R4 is a machining step for cutting with the reverse cutting tool T4. And
The recess of the inner diameter is the same as that of the recess of the outer diameter except that the tool is used for cutting the inner diameter.

(Problems to be solved by the invention) However, the reverse cutting tool T determined in this way
2. If the recesses are deep or the widths of the recesses are small in the cutting regions R2 and R4 formed by T4, there may be a case where a hand-held tool cannot be cut by a tool that can be easily obtained by the general public, let alone a hand-held tool. Such a machining step is not useful in actual cutting even if it is generated, and furthermore, the operator determines whether or not a non-cuttable step has been generated, or which part of the post-processed shape is a non-cuttable area. There was a drawback that there was no means to know clearly.

That is, when the conventional numerical control information generating apparatus generates a processing step having a concave portion in the post-processing shape, the sub-cutting angle of the forward cutting tool is checked, and the step is generated first. At this time, if there is an uncut portion, a machining step is generated assuming that cutting is performed with a reverse cutting tool. Therefore, when the width of the concave portion is smaller than the tool width or the like, uncut portions may be generated in actual cutting. However, when determining the process, there is no means for the operator to know whether there is any uncut portion, and the operator must rely on a machining test or the like. Moreover, the generated process is useless in actual cutting unless a tool having a special tool shape is used.

The present invention has been made in view of the above-described circumstances, and an object of the present invention is to determine a machining process when a recess is present in a shape after machining, when determining a shape of a recess and a tool shape of a selected tool. From the above, it is determined whether or not cutting is possible.If any uncut remains, the operator is notified of the occurrence of uncut by a message and a graphic display to inform the operator, and the area where cutting is impossible is cut. An object of the present invention is to provide a numerical control information creating device that creates a tool shape and a machining process that can perform the machining and creates effective numerical control information even in actual cutting.

(Means for Solving the Problems) According to the present invention, a shape at the time of completion of processing and a shape before processing are input, and a processing area expressed as a difference between the shape at the time of processing completion and the shape before processing is determined in advance. If machining is performed with the tool selected from the registered tools and uncut portions are generated, numerical control information for performing machining by selecting a tool for machining uncut portions from the previously registered tool is created. An object of the present invention is to provide a numerical control information creating apparatus, which has an object to cut the uncut portion of the concave portion from the uncut portion when there is no tool capable of cutting the uncut portion of the concave portion in a pre-registered tool. This is achieved by providing a cutting tool generation unit that generates a possible tool shape and creating numerical control information of a concave shape by the generated tool.

(Operation) In the present invention, a concave portion is extracted from the post-machining shape, and it is determined whether or not there is a tool capable of cutting the concave portion based on the tool edge shape, tool width, and concave shape from a tool group registered in advance. .
If there is no cuttable tool, the concave portion is recognized as a groove, and the shape of the cuttable groove tool is generated to generate a cuttable groove process. Also, if uncut parts occur,
The message and the uncut area are displayed graphically. Thus, if there is an area that cannot be cut with the registered tool, the operator can immediately know the message and the graphic display. Further, since a tool shape that can be cut is generated and the machining process is determined based on the shape, a process that is invalid in actual cutting is not generated.

(Embodiment) An embodiment of a numerical control information device according to the present invention is shown in FIG. 1 corresponding to FIG. The same parts as those of the conventional numerical control information generating apparatus shown in FIG.

In the present invention, a concave shape extracting unit 20 for extracting a concave portion from the post-processed shape MAA in the post-processed shape storage unit 7 is provided, and a concave portion is extracted from the extracted concave shape data, tool shape, and pre-process shape data. Is provided with a post-recess processing shape dividing portion 21 which determines the processing step. Furthermore, an uncut portion for checking whether or not uncut portions are determined when determining a processing step of the concave portion.
24, a tool that is registered in the tool shape storage unit 6 for each process, if the uncut portion is not eliminated, a cuttable tool shape generation unit 23 that recommends a cuttable tool, and an operator graphically displays the occurrence of the uncut portion. The unremoved area display data generation unit 25 that generates data for notifying the operator, the unremoved message generation unit 26 that generates data for notifying the operator with a message, and the concave part that generates the machining process of the part excluding the concave part. The post-processing shape dividing unit 22 to be removed is newly added to the conventional numerical control information creating apparatus.

Next, the operation of the present invention will be described with reference to the flowchart of FIG. 2 and FIG. 3 by taking, as an example, a shape having a concave shape in the outer diameter portion of the processed shape of FIG.

Of the fourth diagram of the input machined shape is a portion surrounded by the region P ₀ to P ₆ required processing. Where points P ₁ through Z
Extending the line parallel to the axis, the range P ₁ to P ₅ surrounded by the intersection P ₅ of the machined shape is extracted with concave extraction unit 20 as a concave shape (step ST1). FIG. 3 shows this part for easy understanding. Next, a forward cutting tool in the tool shape storage unit 6 for each process is selected and set as a tool candidate (steps ST2 and ST2).
3) Check whether cutting is possible in one process using only the forward cutting tool for which the recess is a candidate (step)
ST4). That is, as shown in FIG.
The angle between the Z-axis of each shape element having a downward slope as viewed from the point P1 constituting the concave shape and ₁ is examined. FIG. 5 shows an example in which cutting can be performed only with a forward cutting tool. If a forward-direction cutting tool that can be cut in one step is found, a cutting tool and a machining step for a concave portion that can be cut in one step are determined (steps ST11 and ST1).
2).

In addition, in FIG.
Since the angle between the tool and the Z axis is 90 ° and there is no forward cutting tool that can cut such a shape in one step, a step that can be cut with the selected tool T1 is first generated. That is, through the inlet point P ₁ of the recess, the straight line to tilt the auxiliary cutting edge angle A1 of the tool T ₁ is, the area P ₁ P _d P ₄ P ₅ surrounded by the intersection Pd intersecting the shape element constituting the recess It is provisionally determined as a process to be processed by the forward cutting tool T1 (step ST5). Next, in order to cut the region P ₁ P ₂ P ₃ P _d which must be cut in the opposite direction the cutting tool, selecting a reverse cutting tool from step each tool shape storage unit 6 (step ST6, ST7). Here, it is assumed that the reverse cutting tool T2 is selected. Then, based on the following conditions and conditions, it is determined whether or not cutting is possible without leaving uncut portions (step ST8).

Forward cutting tool has a slope of the minor cutting edge angle A1 of T1, the recess intersects the straight line intersection Pd through the inlet point P ₁ of the concave shape element ▲
Angle theta ₁ with the Z axis of ▼ is smaller that than the minor cutting edge angle A2 of reverse cutting tool T2.

The width Wd between the intersection point Pd and the outlet of the concave portion is
Must be larger than the tool width Wt.

If the above two conditions and the above conditions are satisfied, cutting can be performed without leaving uncut portions. Therefore, it is decided to use the tools T1 and T2 (step ST11), and in FIG.
A processing step for cutting each of the regions S2 with the tool T2 is determined (step ST12). Here, the processing step of the region S1 is determined by the post-processing shape dividing unit 22 excluding the concave portion. here,
If a tool that satisfies the above two conditions and
If there is no in-process tool shape storage unit 6 registered as a hand-held tool and a standard tool that can be easily obtained by the general public, it is assumed that uncut portions will be left in this concave portion,
By comparing the message and the processed shape, a graphic is displayed for the uncut area (step ST9).
As described above, when there is no tool that can be cut, the concave portion is regarded as a groove, and a groove cutting tool shape is generated (step ST10). Therefore, it is possible to generate a groove process capable of cutting a concave portion, and to determine a machining process having no uncut portion.

FIGS. 6 (A) and 6 (B) show an example of generating a grooving tool. Here, it is assumed that a concave portion in the range of Pa to Pb is determined to be an uncut area. If the element at the bottom of the recess is parallel to the Z-axis (parallel to the X-axis if the recess is an end face) as shown in FIG. Generate a tool. If the element at the bottom of the concave portion is not parallel to the Z axis (X axis in the case of the end surface concave portion) as shown in FIG.

FIG. 7 is an example of display in a case where uncut portions are generated and the concave portion is changed to a groove process (outside groove). In the shaded portion, the uncut portion occurs with the registered tool, and the groove process (third,
4) automatically changed to the fourth step). Display device
In 14, the color and pattern are displayed differently from the other parts. In this example, since the concave portion has been changed to the groove process, the entire concave portion is displayed as an uncut region.
If the region S2 of the concave portion in the figure is left uncut, the uncut region S2
It is also possible to display only.

In addition, although the concave shape of the outer diameter is described as an example, the concave portion of the inner diameter and the concave portion of the end face can be realized by the same method.

(Effect of the Invention) According to the numerical control information creating apparatus of the present invention, when there is a concave portion in a shape after machining, it is determined whether or not cutting can be performed without leaving uncut by a tool selected from a tool registered in advance, If an uncut portion occurs, the operator is notified by a message and a graphic display, so that it is possible to easily know whether or not cutting can be performed with an existing tool. Further, in a case where the uncut portion is generated by the existing tool, by generating a tool shape and a machining process that can be cut, it is possible to create effective numerical control information in actual cutting.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart showing a method of determining a processing step of a concave portion according to the present invention, FIG. 3 is a diagram showing a method of determining the presence or absence of uncut portions according to the present invention, FIG. 4 is a diagram showing an example of the division of the cutting area of the outer diameter concave portion, FIG. 5 is a diagram showing an example of a concave portion that can be cut only with a forward cutting tool, and FIGS. 6 (A) and (B) are uncut portions. FIG. 7 is a diagram illustrating an example of generating a tool that can be cut when an area is generated, FIG. 7 is a diagram illustrating a display example when uncut portions are generated, FIG. 8 is a block diagram illustrating an example of a conventional numerical control information generation device, Ninth
The figure shows the forward and reverse cutting tools and the cutting area. 1 ... data input device, 2 ... data input section, 3 ... pre-processing shape storage section, 4 ... pre-processing shape division section, 5 ... step-by-step pre-processing shape storage section, 6 ... ... step-by-step tool shape. Storage, 7
..... shape storage unit after machining, 10 ... numerical control information creation unit, 12
... Display control unit, 20 ... Concave shape extracting unit, 21 ... Shape dividing unit after concave processing, 22 ... Shape after processing excluding concave unit, 23
…… cuttable tool shape generation unit, 24 …… left uncut portion determination unit.

Claims (1)

(57) [Claims] 1. A shape at the time of completion of machining and a shape before machining are input, and a machining area expressed as a difference between the shape at the time of machining completion and the shape before machining is selected from tools registered in advance. In the numerical control information creating apparatus for performing machining with a tool, and in the case where uncut residues are generated, further selects a tool for machining the uncut remaining from the previously registered tools and creates numerical control information for performing machining. In the case of the previously registered tool, when there is no tool capable of cutting the remaining uncut portion of the concave portion, a cuttable tool generating portion that generates a tool shape capable of cutting the remaining uncut portion of the concave portion from the remaining portion is provided, A numerical control information generating apparatus, which generates numerical control information of a concave shape by the generated tool.