JPH05169350A - Numerical control information composer - Google Patents

Abstract

PURPOSE:To balance each machining time in plural units of spindles, in a numerical control information composer. CONSTITUTION:A machining time calculating part 13 calculates a span of machining time for a machining process determined at each spindle at a machining process decision part 7. A machining share changing part 14 changes a spindle taking charge of the machining process with the machining time calculated at the machining time calculating part 13. Then, a numerical control information generating part 9 generates numerical control information having the machining time at each spindle well-balanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerical control information creating apparatus for creating numerical control information when processing a material using a numerically controlled machine tool.

[0002]

2. Description of the Related Art Today, so-called numerical control machine tools that automatically control machine tools based on numerical control information composed of numerical values and signs have become widespread, and automation of machining, realization of complex and advanced machining, and reduction of machining cost. , Greatly contributes to reduction of processing time. In this numerically controlled machine tool, it is necessary to input information for numerical control in advance prior to machining, but recently, for the purpose of simplification, data is interactively input and numerical control information is created. A numerical control information generating device is widely used. By using such a numerical control information generation device, the input of the material material, the input of the material shape and the processing method (processing area, cutting direction, cutting tool, cutting condition,
By inputting the processing order, etc.), numerical control information for processing can be created. Further, recently, a numerical control information creating apparatus has appeared, which automatically determines a processing method and creates numerical control information by inputting a material shape and a shape of a part after processing.

FIG. 15 is a block diagram showing an example of a conventional numerical control information generating apparatus capable of generating numerical control information for a two-spindle lathe having two spindles and a tool rest, for example. Key input data SB input by the operator operating the keyboard 2 in response to an inquiry from the CRT 1
Is sent to the input / display control unit 3 and the material shape data SC
And each data S classified into the processed part shape data SD
C and SD are stored in the material shape storage unit 4 and the processed part shape storage unit 5. The material shape data SC and the post-machining part shape data SD are read from the material shape storage section 4 and the post-machining part shape storage section 5 to the machining allotment determining section 6 and are machined by the first spindle and the second machining area. The processing area data SE is sorted, and the processing area data SE is determined and sent to the processing step determination unit 7. Then, based on the machining area data SE, the machining process required to perform the cutting with the first spindle and the machining process required to perform the cutting with the second spindle are determined, and the machining process storage unit 8 as the machining process information SF. Memorized in. The machining process information SF is read from the machining process storage unit 8 to the numerical control information generation unit 9, numerical control information SG is generated and output to the outside in the form of a paper tape 11 or a magnetic disk 12 via the numerical control information output unit 10. To be done.

[0004]

In the above-mentioned conventional numerical control information generating apparatus, when a large number of workpieces are machined continuously, for example, the first spindle can be used for the surface of the workpiece and the second spindle.
Since the machining time is not taken into consideration when simultaneously machining the back surface of the workpiece with the spindle, the required machining time for the first spindle and the second spindle may be unbalanced. In this case, one spindle may be idle during machining while the other spindle is idle, and as a result, there is a problem that the entire machining time becomes long. The present invention has been made under the circumstances described above, and an object of the present invention is to provide a numerical control information creating apparatus for creating numerical control information capable of balancing the machining times of a plurality of spindles.

[0005]

SUMMARY OF THE INVENTION The present invention is a numerical control information creating apparatus for creating numerical control information for controlling a numerically controlled machine tool capable of simultaneous cutting with a plurality of spindles and tools based on input data. The above-mentioned object of the present invention relates to a calculation means for calculating a machining time of a machining process determined for each spindle, and a modification for changing the spindle that is responsible for the machining process using the calculated machining time. And means
This is achieved by creating numerical control information that balances the machining time for each spindle.

[0006]

In the present invention, the machining time of the machining process that each spindle is responsible for is calculated, and the machining process that each spindle is responsible for is changed so that each spindle performs the machining operation for substantially the same time.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an example of the numerical control information generating apparatus of the present invention in correspondence with FIG. 15. The same components are designated by the same reference numerals and their description is omitted. Based on the machining area data SE sent to the machining step determination unit 7, a machining step required for cutting with the first spindle and a machining step required for cutting with the second spindle are determined. Processing time calculation unit 1 as processing step information SF
3 and the spindle priority order adding unit 15. And
The machining time calculation unit 13 calculates the machining time for each process of the machining process information SF and sends it as machining time information SH to the machining allotment changing unit 14, and the spindle priority order adding unit 15 calculates the machining process information SF. A spindle to be preferentially machined for each process and a spindle to be preferentially machined next are determined, added to the machining process information SF, and sent to the machining allotment changing unit 14 as machining process information SJ with spindle priority data. To be done. Then, based on the machining process information SJ with the spindle priority data and the machining time information SH, the machining share of each spindle is changed so that the machining time can be distributed to a plurality of spindles in a well-balanced manner, and the machining share is changed. It is stored in the machining process storage unit 8 as machining process information SI.

In such a configuration, an example of the operation of the spindle priority order adding section 15, which is the main part of the spindle spindle lathe, in which one side is machined by the first spindle and then the remaining one side is machined by the second spindle, is shown as an example. It will be described with reference to the flowchart of FIG. Note that the spindle priority order adding section 15 sequentially performs processing for each step, but the processing for that one step is shown in the flowchart. First, the machining process information is searched to determine whether the machining share of the corresponding process is the first spindle (step S1).
0), if the machining share is the first spindle, the first priority spindle is set as the first spindle (step S22), and if the machining share is the second spindle, the first priority spindle is set as the second spindle. Yes (step S11). Since the flow in the right half and the flow in the left half of the following flowcharts are almost the same, the corresponding portions will be described at the same time.

It is judged whether or not the machining type is end face machining (step S12 (step S23)), and if the machining type is end face machining, it is impossible to change the spindle to be machined, so the second priority is given. The spindle is set to "none" (step S19 (step S31)), and all the processes are completed. On the other hand, if the machining type is not end face machining in the judgment step S12 (step S23), it is judged whether or not the material grasping method is outer diameter grasping (step S13 (step S24)), and if the grasping method is inner diameter grasping. For example, it is determined whether the machining type is outer diameter longitudinal machining (step S1).
5 (step S26)). If the machining type is not outer diameter longitudinal machining, it is impossible to change the main spindle for machining because it is grasping the inner diameter and not outer diameter longitudinal machining. Therefore, the second priority spindle is set to "none" ( Step S19
(Step S31)), and all processing is ended. on the other hand,
If the grasping method is the outside diameter grasping in the judgment step S13 (step S24), it is judged whether or not the machining type is the inner diameter longitudinal machining (step S14 (step S2
5)), if the processing type is not inner diameter longitudinal processing, it is determined whether the processing type is drill penetration processing (step S1).
6 (step S27)). If the type of drilling is not drill penetration, it is not possible to change the spindle to be machined because it is an outside diameter grasp and not an inside diameter longitudinal machining, and it is not drill penetration, so the second priority spindle is “none”. Is set (step S19 (step S31)), and all processing is terminated.

On the other hand, judgment step S16 (step S2
If the processing type in 7) is drill penetration processing,
In the case of step S16, the second priority spindle is unconditionally set to "first
"Spindle" is set (step S19), and all the processes are completed. Further, in the case of step S27, if the drill penetrating process is moved to the second spindle, there is a possibility that other inner diameter processes become impossible to process. Therefore, it is determined whether or not the inner diameter machining is present in the other processes of the first spindle (step S3
0), if there is no inner diameter machining, the second priority spindle is set to "Second
"Spindle" is set (step S33), and all the processes are completed. On the other hand, if there is an inner diameter machining in the determination step S30, the second priority is given so as not to disturb the machining order of the inner diameter machining and the drill penetration machining. Since it has to be moved to the main spindle, the second priority spindle is set as "conditional second spindle" (step S32), and all the processes are finished.On the other hand, in the determination step S14 (step S25), the machining type is changed. When the inner diameter longitudinal machining is performed, or when the machining type is outer diameter longitudinal machining in the determination step S15 (step S26), the spindle to be machined is selected when the machining shape has a large climbing inclination or an absolute amount of climbing. If it is changed, it will be a large down-cut and it will be impossible to process, so it is judged whether the up-cut is within the allowable range (step S17).
(Step S28) If the climbing step is larger than the allowable range, the second priority spindle is set to "none" (step S19 (step S31)), and all the processes are ended.

On the other hand, judgment step S17 (step S2
If it is the cutting of the climbing step smaller than the allowable range in 8), it is determined whether or not the machining process is the rough machining process in step S17 (step S18), and if the machining process is the rough machining process. Since there is no concern that the relationship between the cutting order of the roughing process and the finishing process will be reversed even if the second spindle is moved to the first spindle, the second priority spindle is designated as "first spindle".
Is set (step S20), and all processing is terminated.
On the other hand, if the machining process is not the rough machining process in the judgment step S18, the process is a finishing machining process.
Since it must be moved to the first spindle so as not to break the relationship between the cutting order of the roughing process and the finishing process,
The second priority spindle is set as "conditional first spindle" (step S21), and all the processes are terminated. Also, step S2
In the case of 8, it is determined whether or not the machining process is the finishing machining process (step S29), and if the machining process is the finishing machining process, the rough machining process and the finishing are completed even if the machining is moved from the first spindle to the second spindle. Since there is no concern that the order of cutting in the machining process will be reversed, the second priority spindle is set to "second spindle" (step S33), and all processing is terminated. On the other hand, if it is determined in step S29 that the machining process is not the finishing process, the process is a roughing process. Therefore, the machining process should not be moved to the second spindle so as not to disturb the relationship between the cutting order of the roughing process and the finishing process. Therefore, the second priority spindle is set as "conditional second spindle" (step S32), and all the processes are terminated.

Next, similarly, an operation example of the machining allotment changing unit 14 which is the main part will be described with reference to the flowchart of FIG. 3 by taking a two-spindle lathe in which one side is machined by the first spindle and then the remaining one side is machined by the second spindle. Described in. First, the machining process information with the spindle priority data and the machining time information are read (steps S1 and S2). Then, the total machining time of each spindle is calculated (step S3), and it is determined whether or not the difference and the ratio thereof are within the allowable range (step S4). If the difference and the ratio are within the allowable range, the machining sharing is performed. Since all changes are unnecessary, all processing ends. On the other hand, if the difference and ratio do not fall within the allowable range, the spindle priority is given because the machining share is changed from the machining processes of the spindle with the longer machining time to find the process in which the other spindle can also perform machining. The data-added machining process information is searched for a process having information on the second priority spindle (step S5). Then, it is determined whether or not there is a process in which the machining share can be changed (step S6). If there is no process in which the machining share can be changed, the machining share cannot be changed and all the processes are terminated. On the other hand, if there is a process in which the machining share can be changed, a position where the process in which the machining share can be changed can be inserted is searched for in the machining process of the spindle having the shorter machining time (step S7). Then, it is determined whether or not there is an insertable position of the process in which the machining share can be changed (step S8). If there is no position in which the process in which the machining share can be changed is inserted, the machining share is changed to the other position. In order to find a process in which machining can be performed on the spindle as well, the process returns to step S5 and the above-described operation is repeated. On the other hand, if there is a position where a process with variable machining share can be inserted, the process with variable machining share is moved from the spindle side with long machining time to the spindle side with short machining time (step S9), and the process proceeds to step S3. It returns and repeats the above-mentioned operation.

Next, a specific example will be described. When the data input by the operator is, for example, the material shape MF surrounded by the straight lines 1W1 to 1W4, the processed part shape PF surrounded by the straight lines l1 to 18 and the surface roughness as shown in FIG. As shown in FIG. 5, the allocation determining unit 6 includes a processing area B1 processed by the first spindle and a processing area B2 processed by the second spindle.
Assign to. The machining process determination unit 7 is configured to process each machining area B1, B
2 is divided as shown in FIG. Roughing shape of area A1 Roughing shape of area A2 Drilling shape of area A3 Roughing shape of area A4 Finishing shape of straight line l2 Finishing shape of straight line l3, l4 Finishing shape of straight line l5, l6, l7, l8 Then, as shown in FIG. 8, the work sharing, the process number,
The process type, the processed portion, the shape data, the cutting direction, and the cutting conditions are given as processing process information. However, regarding the drilled shape, it is sufficient if the area A3 shown in FIG. 6 can be cut, but in reality the drill needs to penetrate the material,
The area D1 shown in FIG. 7 is treated as being cut. The machining time calculation unit 13 uses the machining process information to determine the actual feed rate for all machining, the machining area for rough machining, the length of the machining shape for finishing machining, the distance between the start and end points for drilling, and total machining. The cutting feed time for machining, auxiliary function time for all machining (non-cutting time including fast feed time, tool change time, etc.) and total time for all machining are calculated, and these are shown in FIG. Information about the processing time.

Here, the calculation method of the actual feed speed and the cutting feed time (roughing and finishing) in FIG. 9 will be described below. The auxiliary function time is set to a uniform value in this example, but since it varies depending on the lathe that actually performs the machining, it may be calculated according to the parameter or directly input by the operator. Actual feed speed [mm / sec] = Spindle speed [rpm] x
Feed rate [mm / rev] / 60 Cutting feed time [sec] (rough machining) = Machining area [mm
2] / (cut depth [mm] x actual feed speed [mm / se
c]) Cutting feed time [sec] (finishing) = machined shape length [mm] / actual feed speed [mm / sec] The machining share changing unit 14 is a machining process information with spindle priority data shown in FIG. The machining allotment to each spindle of the process is changed from the machining time information shown in 9. At this time, for example, in the case of a two-spindle lathe, in the conventional numerical control information generating device, the processing share is determined as shown in FIG. 13 without considering the processing time, so that the processing time for each process is used as the basis. When a bar graph of the machining time is created, it becomes as shown in FIG. 14, and the first spindle side is idle because the machining time is out of balance. However, in the numerical control information creation device of the present invention, since the machining allocation to each spindle is changed as shown in FIG. 11, when a bar graph of the machining time is created based on the machining time for each process, Since the processing time is well balanced, the total processing time can be shortened.

[0015]

As described above, according to the numerical control information creating apparatus of the present invention, it is possible to create the numerical control information for cutting in consideration of the balance distribution of the processing time, so that the total processing time can be shortened. It is possible to improve work efficiency and reduce costs.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a numerical control information generation device of the present invention.

FIG. 2 is a flowchart showing an operation example of a main part of the device of the present invention.

FIG. 3 is a flowchart showing an operation example of another main part of the device of the present invention.

FIG. 4 is a first diagram for explaining a specific operation example of the device of the present invention.

FIG. 5 is a second diagram for explaining a specific operation example of the device of the present invention.

FIG. 6 is a third diagram for explaining a specific operation example of the device of the present invention.

FIG. 7 is a fourth diagram for explaining a specific operation example of the device of the present invention.

FIG. 8 is a diagram showing a first example of a data table according to the device of the present invention.

FIG. 9 is a diagram showing a second example of a data table according to the device of the present invention.

FIG. 10 is a diagram showing a third example of a data table according to the device of the present invention.

FIG. 11 is a diagram showing an example of a process for each main spindle created by the device of the present invention.

12 is a diagram showing an example of the total processing time of the steps shown in FIG.

FIG. 13 is a diagram showing an example of a process for each spindle created by a conventional device.

14 is a diagram showing an example of the total processing time of the steps shown in FIG.

FIG. 15 is a block diagram showing an example of a conventional numerical control information creation device.

[Explanation of symbols]

 13 Machining time calculation unit 14 Machining share changing unit 15 Spindle priority order adding unit

Claims (3)

[Claims] 1. A numerical control information creating apparatus for creating numerical control information for controlling a numerically controlled machine tool capable of simultaneous cutting with a plurality of spindles and tools based on input data, is determined for each spindle. Numerical control information that balances the machining time for each spindle by providing a calculating means for calculating the machining time of the machining step and a changing means for changing the spindle that is in charge of the machining step using the calculated machining time. A numerical control information creation device characterized in that 2. The calculating means calculates a machining time from a machining area, a depth of cut and a feed rate for a rough machining step, and a machining time from a machining shape length and a feed rate for a finishing machining step. The numerical control information creation device according to claim 1, wherein, for drilling, the machining time is calculated from the distance between the start point and the end point and the feed rate. 3. The numerical control information generating apparatus according to claim 1, wherein the changing unit changes the machining step according to the priority data of the spindle that is in charge of the machining step given to the machining step.