JPH03179511A - Producing device for numerical control information - Google Patents

Abstract

PURPOSE:To produce the numerical control information that is effective to the real cutting by extracting a recess shape to decide whether this shape can be cut with an existing tool or not and displaying graphically the recess shape and an area to be uncut at occurrence of an uncut area. CONSTITUTION:A recess shape extracting part 20 extracts a recess shape covering a point P1 through an intersecting point P5 obtained by extending a straight line parallel to an axis Z out of those inputted working shaped. Then a forward cutting tool is selected out of a process-based tool shape storing part 6, and an angle formed between the axis Z and each shape element having a descending slope when viewed from the point P1 is checked together with a width cutting blade angle A1. When the angle A1 is always larger than the former angle, it is decided that the cutting is possible. When the angle formed between the axis Z and the descending elements P1/P2 is larger than 90 deg., a process that can be cut with a tool T1 is produced. Then a reverse cutting tool T2 is selected out of the part 6 to decide whether an uncutting process is possible or not for execution of the cutting operation. If an uncut area is produced, the working process is studied by a worked shape dividing part 21. Then the tool T2 is selected if no cutting enable tool is stored in the part 6.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a numerical method for inputting a shape after processing and a shape before processing, and creating numerical control information from the shape after processing and the shape before processing. The present invention relates to a control information creation device.

(Prior Art) FIG. 8 is a block diagram showing the functions of a numerical control information creation device according to the prior art.

Such a conventional numerical control information creation device is a data input device 1.
A pre-machining shape storage section 3 inputs data from the outside through the data input section 2, inputs pre-machining shape data MF, post-machining shape data M, and process-by-process tool shape data PT, and stores them respectively. It has a post-processing shape storage section 7 and a tool shape storage section 6 for each process. Then, the pre-processing shape MFA from the pre-processing shape storage unit 3 is divided into each process, and the pre-processing shape for each process is obtained! A pre-machining shape dividing unit 4 that creates IIFB, a pre-machining shape storage unit 5 for each process that stores the pre-machining shape MFB for each process created here, and an after-machining shape MAA from the post-machining shape storage unit 7 for each process. It is provided with a post-processing shape dividing unit 8 that divides the machine into a post-processing shape MA8 for each process, and a post-processing shape storage unit 9 for storing the pre-processing shape MAR for each process created here. Furthermore, a display control unit 12 that selects and controls data to be displayed on a display device fff14 such as a CRT via a display data output unit 13, and a pre-processing shape for each process and processing for each process from a pre-processing shape storage unit 5 for each process. A numerical control information output unit 10 that creates numerical control information by inputting the post-machining shape for each process from the post-shape storage unit 9 and the tool shape for each process from the tool shape storage unit 6 for each process, and the created numerical control Enter the information and use paper tape! 5. The magnetic disk 161 has a numerical control information output $11 that is outputted to the outside in the form of a communication signal 17 or the like.

With such conventional numerical control/report creation equipment, in order to determine the machining process when there is a concave part in the shape after machining, the process must first be determined to prevent interference between the part of the tool outside the blade assembly and the workpiece. With the slope of the minor cutting edge angle of the forward cutting tool stored in the tool shape storage unit 6, the area formed by the intersection of the recess and the straight line passing through one of the artificial points of the recess is determined by the forward cutting tool. The remaining portion of the recess was processed using a cutting tool in the opposite direction. That is, as shown in FIG. 9, in the recessed part of the outer diameter, the region R1 is the forward cutting tool T1
This is a machining process in which the area R2 is cut with a cutting tool T2 in the opposite direction. Further, in the recessed portion of the end face, a region R3 is a machining process in which cutting is performed using a forward cutting tool T3, and a region R4 is a machining process in which cutting is performed using a reverse cutting tool T4. The four portions on the inner diameter are the same as the recessed portions on the outer diameter, except that the tool is used for cutting the inner diameter.

(Problem to be solved by the invention) However, the reverse direction cutting tool T2 determined in this way
．． The cutting regions R2 and R4 by T4 have deep recesses,
If the width of the recess is narrow, it may not be possible to cut it with tools that are readily available, let alone hand tools. Even if such a machining process is generated, it is useless in actual cutting, and the operator must check whether or not a process that cannot be cut has been generated, or which part of the shape after machining is an area that cannot be cut. The drawback was that there was no way to clearly know what would happen.

However, in the conventional numerical control information generation device, when generating a machining process for a shape having a concave portion after machining, the minor cutting edge angle of the forward cutting tool is checked and the process is first generated.

At this time, if there is any uncut portion, a machining process is generated in which it is assumed to be cut with a cutting tool in the opposite direction. Therefore,
If the width of the recess is narrower than the tool width, uncut material may be left uncut during actual cutting. However, when deciding on a process, there is no way for the operator to know whether there is any uncut material.
They had to rely on Kaedest and others. Moreover, the generated process was useless in actual cutting unless a tool with a special shape was used.

The present invention was made in view of the above-mentioned circumstances,
The purpose of the present invention is to determine whether or not cutting is possible based on the shape of the recess and the shape of the selected tool when determining the machining process when there is a recess in the shape after machining. If this occurs, the operator is notified of the occurrence of uncut material by a message and graphic display, and a tool shape and machining process that can cut the area that cannot be cut is generated, and the tool is used to create a tool shape and machining process that can be used in actual cutting. Another object of the present invention is to provide a numerical control information creation device that creates effective numerical control information.

(Means for Solving the Problems) The present invention inputs the shape at the time of completion of machining and the shape before machining, uses tool data registered in advance, and the shape at the time of completion of machining and the shape before machining. The present invention relates to a numerical control information creation device that divides a machining area expressed as a difference between The above-mentioned purpose of the above is to provide a concave shape extracting section that extracts a concave shape from the shape at the time of completion of machining, and to determine whether there is any uncut material from the concave shape and the shape of a tool that has been cut in advance. In this case, this can be achieved by providing an uncut area determination unit that determines the uncut machining area, and an uncut area display data generation unit that graphically displays the concave shape and the area that will be left uncut when an uncut area occurs.

(Function) In the present invention, the recess is extracted from the post-machining shape, and it is determined whether there is a tool that can cut the recess based on the shape of the cutting edge of the tool, the width of the tool, and the shape of the recess from a group of tools registered in advance. . If there is no tool that can cut fjE, the recess is recognized as a groove, and a shape of a groove tool that can be cut is generated to create a groove process that can be cut. In addition, if there is uncut material,
Messages and uncut areas are displayed graphically. As a result, if there is an area that cannot be cut with the registered tool, the operator can immediately know through a message or graphic display. In addition, since the shape of the tool that can be cut is utilized and the machining process is determined based on that shape, it is possible to avoid creating a process that would result in unnecessary cutting in actual cutting.

(Embodiment) The embodiment of the numerical control information device according to the fourth aspect of the present invention is described in the eighth embodiment.
The diagram is shown in FIG. 1 in correspondence with the figure. The same parts as in the conventional numerical control information creation device shown in FIG. 8 are denoted by the same reference numerals, and the explanation will be omitted.

In the present invention, a concave shape extracting section 20 is provided which extracts a concave shape from the machining shape MAA in the machining shape storage section 7, and the concave shape is extracted from the extracted concave shape data, the shape of the tool, and the pre-machining shape data. A shape dividing section 21 after recess machining is provided to determine the machining process. Furthermore, there is an uncut determination part 24 that checks whether there is any uncut material when determining the machining process for a concave part, and a remaining uncut part 24 that checks whether there is any uncut part when deciding the machining process for a concave part, and a tool that can cut the part if the uncut part cannot be eliminated with the tools registered in the tool shape storage part 6 for each process. a machinable tool shape generation unit 23 that recommends the machinable tool shape, and an uncut area display data generation unit 25 that generates data to notify the operator of the occurrence of uncut areas using a graphic display;
An uncut message generating section 26 that generates data to notify the operator by message, and a post-machining shape dividing section 22 that generates the machining process for the part excluding the recessed part 22.
This is a new addition to the conventional numerical control information creation device.

Next, the present invention will be described in detail with reference to the flowchart of FIG. 2 and FIG. 3, taking as an example the shape after processing shown in FIG. 4 having a concave shape on the outer diameter.

Of the inputted post-processing shape in FIG. 4, the area that requires processing is P. -P, is the part surrounded by. Here, point P1
Karaz! 1! lI+ e The parallel straight lines are extended, and the range P1 to P5 surrounded by the intersection point P5 with the processed shape is extracted as a concave shape by the concave shape extraction unit 20 (Step 5TI)
. FIG. 3 clearly shows this part. Next, select the forward cutting tool in the tool shape storage unit 6 for each process and select it as a tool candidate.

5T3), it is checked whether the concave portion can be cut in one step using only the forward cutting tool that is a candidate (step 5T4). That is, as shown in Fig. 3, the angles between the Z-axis and the downward slope of each shape element are examined in view of the minor cutting edge angle AI of the tool and the points P, h) that constitute the concave shape, and the angles of each of the minor cutting edges AI are determined. If it is always larger, it is considered that cutting is possible. FIG. 5 shows an example in which cutting can be performed using only a forward cutting tool. If, -
If a forward cutting tool that can be cut in the process is found, - determine the four cutting tools that can be cut in the process and the machining process (
Step 5TII, 5T12).

In addition, in FIG. 3, the downward slope elements PIP2 and ZI
The angle with iIII is 90°, and since 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. In other words, the area plPdP4Ps, which passes through the artificial point P of the recess and is surrounded by the intersection point Pd where a straight line whose inclination is the minor cutting edge angle ^l of the tool T1 intersects with the shape element constituting the recess, is machined with the forward cutting tool TI. It is tentatively determined as the process to be performed (step 5T5). Next, a reverse direction cutting tool is selected from the tool shape storage unit 6 for each process to cut the region p, p2p3p, which must be cut with the reverse direction cutting tool (step S
T6.5T7). Here, it is assumed that the reverse direction cutting tool T2 is selected. Then, it is determined whether cutting is possible without leaving any uncut parts according to the following conditions and
T8).

■Angle θ1 with ZfqI+ of the shape element p3p4 of the recess, which has an inclination of l to the minor cutting edge angle of the forward cutting tool T1 and intersects the straight line passing through the population point P of the recess at the intersection point Pd, is Must be smaller than the minor cutting edge angle A2 of T2.

(2) The width Wd between the intersection point Pd and the exit of the recess is larger than the tool width Wt of the reverse direction cutting tool T2.

If the above two conditions (1) and (2) are satisfied, cutting can be performed without leaving any uncut parts, so it is decided to use the tools TI and T2 (step 5711). In FIG. A machining process is determined to cut each of the two (step 5TI2).

Here, the processing step for the region 51 is determined by the post-processing shape division section 22 excluding the recessed portion. Here, if a tool that satisfies the above two conditions (1) and (2) exists in the tool shape storage unit 6 for each process, which is registered as a hand-held tool or a standard tool that is easily available to the general public. If not, it is assumed that an uncut area is generated in this recess, and the uncut area is graphically displayed by comparing it with the message and the post-processing shape (step ST9). In this way, if there is no cutting tool, the recess is regarded as a groove, and a groove cutting tool shape is generated (step 5TIO). Therefore, it is possible to generate a groove process in which the concave portion can be cut, and to determine a machining process that leaves no uncut parts.

S6 Figures (A) and (B) show an example of generating a cutting tool, and here it is assumed that the recess in the range of PaxPb is determined to be an uncut area. (8) If the bottom element of the recess is parallel to Z@ (parallel to X glaze if it is a 3ija surface recess) as shown in the figure, then the length of the shape element corner after processing W
Generate a groove tool with the width of the groove tool. Also, (B)
As shown in the figure, the bottom element of the recess is 2 glazes (X@ if it is an end face recess)
If L' is not parallel, a grooved tool is generated whose cutting edge shape is the shape after machining of PazPb.

FIG. 7 is an example of a display when uncut parts are generated and the recess is changed to a groove process (outer diameter groove). The shaded area indicates that uncut parts were generated with the registered tool and the process was automatically changed to the groove process (third and fourth processes). Display device 1
4, the area is displayed in a different color or pattern from other areas. In this example, the recess has been changed to a groove process, so the entire recess is displayed as the uncut area, but if the fourth
If the area S2 of the concave portion in the figure is left uncut, it is also possible to display only the uncut area S2.

Note that although a concave shape on the outer diameter is used as an example, a concave shape on the inner diameter and a concave shape on the end face can also be realized by the same method.

(Effects of the Invention) According to the numerical control information creation device of the present invention, when there is a recess in the shape after machining, it is determined whether or not it is possible to cut it with a tool selected from pre-registered tools without leaving any uncut parts. If uncut material is generated, the operator is notified by a message and graphic display, so it is easy to know whether cutting is possible with existing tools or not. Further, when uncut parts are generated with an existing tool, by creating a tool shape and machining process that can be cut, it is possible to create numerical control information that is effective in actual cutting.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart showing a method for determining a recess machining process according to the present invention, and FIG. 3 is a diagram showing a method for determining the presence or absence of uncut parts according to the present invention. Figure 4 is a diagram showing an example of dividing the cutting area of an outer diameter recess, Figure 5 is a diagram showing an example of a recess that can be cut only with a forward cutting tool, and Figures 6 (A) and (B) are uncut parts. FIG. 7 is a diagram showing an example of a display when an uncut area is generated. FIG. 8 is a block diagram showing an example of a conventional numerical control information creation device. 9th
The figure is a diagram showing forward and reverse cutting tools and cuttable areas. 1... Data input device, 2... Data input section,
3... Pre-processing shape storage section, 4... Pre-processing shape division section, 5... Pre-processing shape storage section for each process, 6... Tool shape storage section for each process, 7... Post-processing shape Storage part, lO
... Numerical control information creation section, 12... Display control section, 2
0... Concave shape extraction part, 21... Shape division part after machining of the concave part, 22... Shape division part after machining excluding the concave part, 23...
- Cuttable tool shape generation unit, 24... uncut determination unit.

Claims (1)

[Claims] 1. The shape at the time of completion of machining and the shape before machining are input, and using tool data registered in advance, the shape is expressed as the difference between the shape at the time of completion of machining and the shape before machining. In a numerical control information creation device that divides a machining region into regions corresponding to one or more machining steps, and then creates numerical control information in the order of machining steps for the divided regions, a concave shape extracting unit that extracts the concave shape, and an uncut determination unit that determines the presence or absence of uncut parts from the concave shape and the shape of the tool registered in advance, and generates an uncut machining area if any uncut parts are left. A numerical control information generation device comprising: an uncut area display data generation unit that graphically displays the concave shape and the uncut area when an uncut area occurs. 2. The numerical control information creation device according to claim 1, further comprising an uncut message generating unit that displays a message informing that uncut areas have occurred when the uncut areas are generated. 3. A cuttable tool generation unit that generates a shape of a tool capable of cutting from the shape of the concave portion if there is no tool that can cut the concave shape among the pre-registered tools and an uncut area is generated; 2. The numerical control information creation device according to claim 1, further comprising a certain tool and a concave-machined shape dividing section that generates a concave-shaped machining process using the generated tool.