JPH10337635A - Processing method, processing program forming device and processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continue the processing surface smoothly in spite of changes in the position of a tool point and to reduce errors to be caused between processing shape and object shape. SOLUTION: First, a tool 10 is approached to an end position P2 and moved along a processing route T2. Then the tool 10 is shifted to a processing route T6, which is a processing route other than a processing route T4 adjoining along the processing route T2, and moved along the processing route T6. In the same way, the processing is made on whole area of processing object area 20. Afterwards, the tool 10 is approached to an end position P4 of the processing route T4 and then the tool 10 is moved along the processing routes T4, T8, and so on in the same way described above. This processing is also made on whole area of processing object area 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for making a machined surface of a workpiece with a tool smoothly continuous.

[0002]

2. Description of the Related Art For a work to be machined, when the area of the work area is large or the like, the work area is divided into a plurality of areas in consideration of tool wear and the like. In the example shown in FIG. 7A, the processing target area 20 of the work 30 is divided into three areas 20a, 20b, and 20c.
Is shown. In this example, processing is performed for each of the divided areas 20a, 20b, and 20c. That is, first, the area 20a is machined with the tool 52,
After changing to area 4, the area 20b is machined and
After the replacement with the area 6, the area 20c is processed.

In this processing method, as shown in FIG. 7B, the processed shape 26 after processing has a certain error with respect to the target shape 24 (the maximum error is an error E4). It is considered that such an error occurs because the position of the tool edge is displaced. This displacement of the tool edge position is considered to be caused by the following factors as shown in FIG. (1) Retraction of tool 50 due to high-speed rotation of spindle (retraction amount L50) (2) Fluctuation until balance between spindle expansion and spindle cooling system due to heat generation (fluctuation L52) (3) Tool Wear (wear amount L54) (4) Release of pull-in due to stop of spindle rotation (release amount L5)
6) Therefore, the tool edge position changes along the curve 62 originally, but the tool edge position changes along the curve 60 due to the above factors.

[0004] When the machining start position of the next area (hereinafter referred to as "next area") is positioned in accordance with the target shape 24 while the tool edge position is being displaced, machining is performed as shown in FIG. As shown, steps 32 and 34 are formed at the boundaries between the areas.
Occurs. The steps 32 and 34 cause problems such as deteriorating the design quality of the product and impairing the formability of the work 30. Therefore, the steps 32 and 34 generated in the post-process.
Need to be removed. On the other hand, since the steps 32 and 34 are discontinuous surfaces partially having large irregularities, it is difficult to smoothly grind the processed surface with an automatic polishing machine. In this case, if the surface is polished by hand polishing, the processed surface can be smoothed, but it is not practical because it requires a large number of steps.

Conventionally, in order to prevent a step from occurring at the boundary between the areas, the processing has been performed by adjusting the processing start position in the next area. That is, the tool edge position at the end of machining in a previous area (hereinafter referred to as “previous area”) is stored, and after positioning at the stored tool edge position, machining of the next area is started. .
In this case, it is necessary to take the following steps when adjusting the machining start position of the next area. This step will be described below with reference to FIG. Here, the term “position” means a position in the height direction because it is natural that the position in the horizontal direction is different between the previous area and the next area. (1) After the end of machining in the previous area, the position of the tool edge is measured while the spindle is rotated. In the example of FIG. 9, in the preceding area, the main shaft starts rotating at time t60, and the time t6
After processing between 2 and t64, the rotation of the spindle is stopped at time 68. In this case, the height L60 measured at time t66 is the tool edge position. (2) After changing the tool and rotating the main spindle, measurement of the tool edge position is performed after waiting until the change of the tool edge position converges to some extent. In the example of FIG. 9, in the next area, the measurement is performed at time t72, which is a short time after the main shaft starts rotating at time t70. In this case, the height L64 is the tool edge position. (3) Correct the position of the tool edge before and after the tool change.
That is, the difference L62 between the tool edge position (height L60) in the previous area and the tool edge position (height L64) in the next area.
(= L60−L64) is used as the correction amount to correct the tool edge position. In this way, since the processing end position in the previous area matches the processing start position in the next area, no step is generated between the areas. Therefore, the machined surface can be smoothly continued.

However, it is difficult to perform such measurement and correction accurately and automatically. for that reason,
An operator (machine operator) needs to adjust the processing start position when starting processing in the next area. Therefore, it is impossible to perform continuous unmanned operation using an ATC (Automatic Tool Change Function) so that a step does not occur at the boundary between the areas. On the other hand, a method is also conceivable in which the position of the tool edge during high-speed rotation is accurately and automatically measured by non-contact measurement or the like. Even when this method is executed, errors gradually accumulate as errors E6, E8, and E10 shown in FIG. 10 progress as each area is processed. Therefore, the processed shape 2 after processing
There is a possibility that an error generated between the target shape 8 and the target shape 24 exceeds an allowable value. Therefore, it is difficult to apply the processing method to the work 30 (for example, a mold) that requires high processing accuracy, for example, because the yield of finished products is reduced.

[0007] In addition, FIG.
In the case of processing along a direction substantially perpendicular to the direction of FIG. 11, that is, a direction as shown in FIG. Undisclosed).

[0008]

However, as described above, if the area is simply divided and machined, the position of the tool edge is displaced, so that as shown in FIG. 34 occurs. On the other hand, if the tool edge position is corrected in order to eliminate the step, an error from the target shape increases as the machining proceeds. The present invention has been made in view of such a point, and it is an object of the present invention to make a processing surface smoothly continuous irrespective of a change in a tool edge position and to suppress an error generated between a processing shape and a target shape to be low. .

[0009]

According to a first aspect of the present invention, there is provided a machining method for machining a machining target area of a workpiece into a target shape by moving a tool according to a plurality of machining paths. The processing is performed by moving the tool according to the path, and at least once, the tool is moved along the next processing path other than the adjacent processing path along the processing path to perform the processing. Here, a path for processing from one end to the other end of the processing target area is defined as a “one-way path”. In this case, the “processing path” means a path including one or a plurality of one-way paths. That is, in the case of FIG.
.., T6,... Each correspond to a machining path. Similarly,
In the case of FIG. 1B, the route T20 (one-way route T20
a and one-way route T20b), route T22 (one-way route T
22a and the one-way path T22b),... Correspond to machining paths, respectively. Note that the position of one end and the position of the other end are usually different positions, but may be the same position, for example, when processing is performed concentrically.

According to the first aspect of the present invention, FIG.
In (A), after a certain processing path T2, processing is performed at least once according to a processing path T6 that is not adjacent to the processing path T2, and such processing is performed on the entire processing target area 20. In this case, at least one next to a certain machining path T2
By performing the processing in accordance with the processing path T6 that is not adjacent to each other, an error generated between the processed shape and the target shape can be suppressed lower than before. The processing target area 20
By performing machining on the entire region, the machining surface can be smoothly continued regardless of a change in the position of the tool edge.

[0011]

According to a second aspect of the present invention, in the machining method according to the first aspect, a next machining path other than an adjacent machining path along the machining path includes:
It is a machining path that is separated by the number of machining paths based on the number of tools required to machine the machining area of the work.

According to the second aspect of the present invention, when the tool is shifted from one machining path to the next machining path,
Shift based on the number of tools required for machining. If the machining is performed while shifting the tools in this manner, the machining surface can be smoothly continued by using the least number of tools and suppressing an error generated between the machining shape and the target shape to be low. Therefore, the finishing accuracy of the processed surface can be further improved.

[0013]

According to a third aspect of the present invention, in the machining method according to the first aspect, the shift direction of the tool for shifting from one machining path to the next machining path is set to a predetermined direction. It is characterized by doing.

According to the third aspect of the present invention, since the machining is performed with the tool shifting direction aligned in a predetermined direction, a change in the position of the tool edge due to tool wear or the like also appears. Therefore, the finishing accuracy of the processed surface can be further improved.

[0015]

According to a fourth aspect of the present invention, a workpiece is processed by controlling a relative positional relationship between a workpiece and a tool based on target shape information. In a machining program creating apparatus for creating a machining program for machining a target area into a target shape, a path generating means for generating a plurality of processing paths based on the target shape information, and a path generated by the path generating means. A machining path is selected, a machining path is selected at least once along the selected machining path, and a machining program is generated in the order of the machining path selected by the path selecting means. And a program generating means for performing the program.

According to the fourth aspect of the present invention, with respect to the machining path generated by the path generating means, a processing path which is not adjacent at least once after a processing path having the path selecting means is selected. The program generating means generates a machining program in the order of the machining paths selected in this manner. In this machining program, machining is performed at least once after a certain machining path according to a machining path that is not adjacent to the machining path, so that an error generated between the machining shape and the target shape can be suppressed lower than before. In this machining program, machining is performed on the entire machining target area, so that the machining surface can be smoothly continued regardless of a change in the tool edge position.

[0017]

According to a fifth aspect of the present invention, there is provided a machining apparatus for moving a tool on the basis of a machining program having a plurality of machining paths and machining an area to be machined into a target shape. And moving the tool according to a certain machining path among the plurality of machining paths, and performing machining by moving the tool according to the next machining path other than the adjacent machining path along the machining path at least once. It is characterized by.

According to the fifth aspect of the invention, for a plurality of machining paths included in the machining program, machining is performed at least once following a machining path that is not adjacent to a certain machining path. This is performed for the entire area. In this case, by performing processing in accordance with a processing path that is not adjacent at least once after a certain processing path, an error generated between the processed shape and the target shape can be suppressed lower than before. Further, by performing processing on the entire processing target area, the processing surface can be smoothly continued regardless of a change in the position of the tool edge.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. [Embodiment 1] First, in Embodiment 1, the present invention is applied to a process in which a work target area of a work is large, and is usually divided into a plurality of areas. The first embodiment will be described with reference to FIGS. Here, FIG. 1 is a view showing a processing method of the present invention, and FIG. 1 (A) shows a processing path including one one-way path, and FIG. 1 (B) shows a plurality of one-way paths. Are shown respectively. FIG. 2 is a diagram showing a machining state and a machining result. FIG. 2 (A) shows a machining state by a first tool, FIG. 2 (B) shows a machining state by a second tool,
FIG. 2C shows a machining state by the third tool and a machining result in a side view.

In FIG. 1A, machining paths T2 and T
4, T6, T8, T10,... Are paths along which the tool 10 moves in order to machine the machining target area 20 of the work 30. These machining paths T2, T4, T6, T8, T1
0,... Are determined based on the machining area, the tool to be used, the pick amount determined from the required surface roughness, the estimated life of the tool 10, the number of tools required to machine the entire machining target area 20, and the like. You. In this example, first, the tool 10 approaches the position P2 (processing start position) at one end, and moves the tool 10 according to the processing path T2. Then, when reaching the position P10 at the other end of the processing path T2, the tool 10 is shifted to the position P12 at one end of the processing path T6 other than the adjacent processing path T4 along the processing path T2, and the tool 10 is moved according to the processing path T6. Let it. Further, when reaching the position P6 of the other end of the processing path T6, the position P8 of one end of the processing path T10 other than the processing path T8 adjacent along the processing path T6.
And the tool 10 is moved according to the machining path T10. In the same manner, processing is performed on the entire processing target area 20. Thereafter, the tool 10 approaches the position P4 (processing start position) at one end of the processing path T4,
The tool 10 is moved along the machining paths T4, T8,... In the same manner as the above operation. This processing is also performed on the entire processing target area 20.

Here, the processing target area 20 of the workpiece 30
FIG. 2 shows an example in the case where it is determined that the number of tools required for machining the tool is three. That is, three tools 12, 1
First, as shown in FIG.
2, the entire area of the processing target area 20 is processed.
As shown in FIG. 2B, the entire area of the processing target area 20 is processed by the tool 14, and finally, the entire area of the processing target area 20 is processed by the tool 16 as shown in FIG. 2C. In this case, when shifting a tool from one machining path to the next machining path, the tool is shifted to a machining path that is separated by the number of machining paths based on the number of tools. For example, in the case of the first machining path, it is shifted to the fourth machining path, and then to the seventh machining path, and so on. Specifically, the shift is performed by a shift amount (A × B) obtained by multiplying the pick amount A required to obtain the target surface roughness by the number of tools B. FIG. 2 shows the result of processing according to this processing procedure.
It is shown in (D). In FIG. 2 (D), indicates the positions machined by the tool 12, by the tool 14, and by the tool 16.

Next, in FIG. 1B, the machining path T2
0, T22, T24,... Are paths along which the tool 10 moves in order to machine the machining target area 20 of the workpiece 30. These machining paths T20, T22, T24,... Are also determined based on the pick amount, the estimated life of the tool 10, the number of tools, and the like. In this example, first, one end position P20
The tool 10 approaches the (processing start position) and moves the tool 10 according to the processing paths T20a and T20b. When reaching the position P22 at the other end of the processing path T20b, the processing path T2 adjacent to the processing path T20 along the processing path T20.
2 is shifted to a position P26 at one end of the machining path T24 other than the tool path T24, and the tool 10 is moved in accordance with the machining paths T24a and T24b.
To move. In the same manner, processing is performed on the entire processing target area 20. Thereafter, the tool 10 approaches the position P24 (processing start position) at one end of the processing path T22, and performs the processing path T22 (T22) in the same manner as the above operation.
a, T22b),... Therefore, the tool 10 is moved. This processing is also performed on the entire processing target area 20.

According to the above-described processing method, in FIG. 1A, processing is performed according to a processing path T6 that is not adjacent at least once after a certain processing path T2, and such processing is performed over the entire area of the processing target area 20. It is done for. In this case, the processing shapes to be performed on the entire processing target area 20 are similar shapes, and the processing conditions such as the feed speed and the spindle speed are the same. Therefore, the machining time is almost constant, and the progress of tool wear is considered to be equivalent. In addition, when machining with multiple tools, the amount of tool pull-in due to the start of rotation after tool replacement, the change in the position of the tool edge in the initial stage until the balance between the heat generation of the spindle and the cooling system is achieved, etc. It is considered that the position of the tool edge that changes under the influence of is similar. Further, since the time required to perform the entire processing of the entire processing target area 20 once is reduced, an error amount due to a change in the position of the tool edge generated during the processing is small. In the subsequent repetitive machining, since the positioning is performed at the machining start position in accordance with the target shape 24, the error amount is not accumulated. For this reason, by performing machining according to the machining path T6 that is not adjacent at least once after a certain machining path T2, the influence of a change in the position of the tool edge is reduced. Therefore, an error generated between the processed shape and the target shape can be suppressed lower than before. Moreover, by performing processing on the entire processing target area 20,
The machined surface can be smoothly continued regardless of the change in the position of the tool edge. For this reason, there is no step that occurs in the related art in which processing is performed by dividing the area into a plurality of areas.

When shifting a tool from one machining path to the next machining path, the tool is shifted by a shift amount (= pick amount A × tool number B) based on the number of tools required for machining. By performing processing while shifting in this manner, the processed surface can be smoothly continued with the least number of tools and with a low error between the processed shape and the target shape. Therefore, the finishing accuracy of the processed surface can be further improved. Further, FIG.
As shown in FIGS. 1A and 1B, if the machining is performed with the tool shift direction aligned with the predetermined direction D2, the change in the tool edge position due to tool wear and the like also appears. Therefore, the finishing accuracy of the processed surface can be further improved.

Here, in the above-mentioned machining method, the accumulation of errors can be further prevented by measuring the tool edge position and correcting the tool edge position when the tool is stopped after the tool change. That is, in the example shown in FIG. 3, in the previous machining performed on the entire machining target area 20, the spindle is started to rotate at time t2, and after the machining from time t4 to t6, the rotation of the spindle is stopped at time t8. I do. In the next machining, the tool edge position of the tool 10 is corrected first.
That is, the tool edge position is measured at the time t10 when the spindle is stopped, and the tool edge position is corrected by the difference between the tool edge positions of the front and rear tools at the stage before the start of machining. That is,
The tool edge position is corrected by a shift amount L2 caused by an error or the like caused by repeatedly changing tools in the ATC. After that, the spindle is started to rotate at time t12, and after machining between times t14 and t16, the rotation of the spindle is stopped at time t18.

If the machining is performed without correction, the position of the tool edge changes along the curve 44. However, if the processing is performed after the correction is performed, the position of the tool edge changes along the curve 42. The change in the tool edge position is almost the same as the change in the tool edge position indicated by the curve 40 in the previous machining. Therefore, it is an object of the present invention to make the machined surface smoothly continuous and to further reduce an error generated between the machined shape and the target shape. When correcting the tool edge position, highly accurate measurement can be performed by a simple contact-type tool length measurement function. Therefore, ATC (Automatic Tool Change)
And automatic cutting edge measurement, continuous unmanned operation is possible.

In the first embodiment, the present invention is applied to machining performed by dividing the work into a plurality of areas and using a plurality of tools. The present invention can be similarly applied to machining in which is performed by a single tool. That is, even when processing is performed in a single area, the processing target area 20 may be processed by the above-described processing method on the assumption that the area is divided into a plurality of areas. This makes it possible to achieve the same effect as that of the first embodiment, that is, to make the machined surface smoothly continuous regardless of a change in the position of the tool edge, and to suppress an error generated between the machined shape and the target shape to be low. In this case, as to how many areas are assumed to be divided, an arbitrary division value can be applied. Desirably, the material of the work 30, the type of the tool 10, the processing conditions, etc.
Alternatively, an optimal division value is applied in consideration of the experience of the operator. In this way, it is possible to further reduce the error that occurs between the processed shape and the target shape.

[Embodiment 2] Next, Embodiment 2
A method of creating a machining program for realizing the machining method according to the first embodiment and a device configuration therefor will be described with reference to FIGS. Here, FIG.
FIG. 2 is a schematic block diagram showing a processing program creating device (or a processing device). FIG. 5 is a flowchart showing the machining program creation processing. Note that numerical control (hereinafter, referred to as “NC”) data is generally used as the machining program.

In FIG. 4, a machining program creating device (or machining device) includes a control unit 100 and an NC machine 2
00. The control unit 100
U (processor) 110, ROM 102, RAM 10
4, operation panel 106, display control circuit 112, display 11
4, an input / output processing circuit 116 and a communication control circuit 118. Since the NC processing machine 200 has a general configuration and is well known, its illustration and description are omitted.

The CPU 110 controls the entire control unit 100 according to a control program stored in the ROM 102. EPROM or EEPROM is stored in the ROM 102.
Are used, and in addition to the control program, character characters and the like to be displayed on the display 114 are stored. RAM1
04 is DRAM, SRAM, or flash RAM
Etc. are used. The RAM 104 stores target shape data, the number of tools, NC data and other various data, input / output signals, and the like. The operation panel 106 allows the operator to issue various commands to the control unit 100,
According to the request of 00, predetermined data such as target shape data is input. Note that a pointing device such as a mouse or a digitizer may be connected to the control unit 100 as needed, and the predetermined data may be input. Communication control circuit 118
Transmits the communication data transmitted from the CPU 110 via the bus 108 to the NC processing machine 200, or receives the communication data transmitted from the NC processing machine 200 and
This is a circuit for sending to 10. The mode of transmitting and receiving data is not limited to wired, but may be wireless.

The display control circuit 112 controls the display of the display 114 in accordance with the display control data sent from the CPU 110 via the bus 108. The input / output processing circuit 116 outputs the output data received from the CPU 110 via the bus 108 to the external storage device 130 or the PTP / PTR
(Paper tape puncher / reader) 140 The external storage device 130 includes an HD (hard disk) device, an FD (flexible disk) device, and the like. These devices record NC data and the like on a magnetic disk 132 (for example, an FD, a magneto-optical disk, and a removable HD). You. The NC data or the like recorded on the magnetic disk 132 is read out by the external storage device 130, and is read via the input / output processing circuit 116 and the bus 108.
It is sent to the PU 110 and the like. On the other hand, PTP / PTR140
Thereafter, NC data and the like are recorded on the paper tape 142. The NC data and the like recorded on the paper tape 142 are also read out by the PTP / PTR 140 and sent to the CPU 110 and the like via the input / output processing circuit 116 and the bus 108 as in the case of the external storage device 130. These magnetic disks 1
32 and the paper tape 142 embody a recording medium, but may be a recording medium that can be held for a certain period by another recording method. In addition, each of the above-mentioned components is a display 11
With the exception of 4, all are coupled to the bus 108.

Next, a processing procedure executed in the control unit 100 in the machining program creating device will be described with reference to FIG. The program creation processing shown in FIG. 5 is realized by the CPU 110 shown in FIG. 4 executing a control program. In FIG. 5, step S12 is a processing step that embodies a route generation unit, step S14 is a path selection unit, and steps S12, S14, and S20 are processing steps that embody a program generation unit. Further, with respect to the processing target area 20 of the work 30, it is assumed that target shape data serving as a basis for generating a processing program is stored in the RAM 104 through the operation panel 106 in advance.

In the program creation processing shown in FIG. 5, first, the number of tools required for machining the machining area 20 of the workpiece 30 is calculated based on the target shape data [Step S10]. Then, based on the target shape data,
A machining program corresponding to the machining path is created [Step S12], and a machining program for performing a tool shift is created [Step S14]. The process is repeated until the entire machining target area 20 is machined [Step S16]. The processing program is created on the magnetic disk 132 through the external storage device 130 in FIG. 4, for example. In addition, the created processing program is used by the display control circuit 112 as needed.
May be displayed on the display unit 114 through the. Further, by repeatedly executing steps S12, S14, and S16, in the example shown in FIG. 2, a machining program that realizes machining with the tool 12 shown in FIG. 2A is created.

Further, if there is another machining path (YES in step S18), a machining program for performing a tool change is created [step S20], and the target machining path is adjusted [step S22]. Step S12,
Execute S14 and S16. Here, the adjustment of the target machining path means that in the example shown in FIG. 2, when a machining program is created for the first machining path, the fourth machining path, the seventh machining path,. The processing start position is adjusted so that a machining program can be created for the fifth, fifth, eighth,... Machining paths.
Then, when there is no other machining path (step S1
(NO in 8), the processing procedure ends. In addition, after step S22, a machining program for correcting the position of the tool edge may be created as needed [step S24].

By executing the above processing procedure, a plurality of machining paths are generated by executing step S12 (path generating means, program generating means) based on the target shape data (target shape information), and a processing program is created. Is done.
After execution of step S14 (path selection means, program generation means), after a certain processing path is selected, a processing path other than an adjacent processing path is selected at least once along the selected processing path. A program is created. By performing processing in the NC processing machine 200 according to the processing program created in this manner,
The processing method described in the first embodiment is realized. Specifically, after a certain processing path, processing is performed at least once according to a processing path that is not adjacent to the processing path, and such processing is performed on the entire processing target area. Therefore, if machining is performed based on the created machining program, the machined surface can be smoothly continued irrespective of a change in the position of the tool edge, and an error generated between the machined shape and the target shape can be suppressed low.

[Embodiment 3] Next, Embodiment 3
A data processing method for realizing the machining method in the first embodiment based on a machining program created by a general machining program creation device will be described with reference to FIG. Here, FIG. 6 shows a machining program execution process in a flowchart. The configuration of an apparatus for implementing this data processing method is described in Embodiment 2.
And the description is omitted. Further, the processing program execution processing is executed and realized in the control unit 100 of the processing apparatus.

In the program execution process shown in FIG. 6, first, the number of tools is calculated based on a machining program for machining the machining target area 20 of the work 30 [Step S3].
0]. That is, the number of tools is calculated based on the number of appearances of the tool change command included in the machining program. For example, the processing program created on the magnetic disk 132 in FIG. Hereinafter, “based on the processing program” is read out by the external storage device 130 or the like. When the function code M06 used in the NC data appears twice in the machining program, the number of tools is calculated as three in consideration of the tool used first. Then, the tool is moved along the machining path based on the machining program to machine the machining target area 20 (step S32). For example, in the control unit 100 shown in FIG.
From 0, it is sent to the NC processing machine 200 through the bus 108 and the communication control circuit 118. In the NC processing machine 200, the control unit 100
Processing is performed according to the operation command sent from. Subsequently, the process of shifting the tool by the number of tools based on the machining program [Step S34] is repeated until the entire machining target area 20 is machined [Step S36]. By repeatedly executing the steps S32, S34, and S36, in the example shown in FIG. 2, for example, machining with the tool 12 shown in FIG. 2A is performed.

Further, it is determined whether or not there is another machining path [step S38]. If there is another machining path (YES), the tool is changed based on the machining program [Step S40], and after adjusting the machining start position [Step S42], steps S32, S34 and S36 are performed again.
Execute Here, whether or not there is another machining path is determined based on whether or not a program stop command, for example, a function code M02 used in NC data has appeared. In the example shown in FIG. 2, when the previous processing is performed according to the first, fourth, seventh,... Processing paths in the example shown in FIG. 8
The positioning adjustment is performed so that the processing start position is at one end of the second processing path so that the processing is performed in accordance with the processing paths of the second,. Note that the position of the tool edge may be corrected after step S42 based on the machining program as needed [step S44]. On the other hand, in step S38, if there is no other processing path (NO), the present processing procedure ends. Thus, based on the machining program, the entire area of the machining target area 20 is machined while changing tools.

By executing the above-described processing procedure, machining is performed by the machining apparatus based on a general machining program that has already been created. That is, the machining method described in the first embodiment is realized by performing machining with the NC machine 200 according to an operation command sent from the control unit 100. Specifically, after a certain processing path, processing is performed at least once according to a processing path that is not adjacent by executing step S34, and such processing is performed on the entire processing target area. Therefore, even when machining is performed using a general machining program, the machined surface is smoothly continued irrespective of a change in the tool edge position, and an error generated between the machined shape and the target shape is reduced. Can be suppressed.

[0040]

According to the present invention, the machined surface can be smoothly continued regardless of the change in the position of the tool edge, and the error generated between the machined shape and the target shape can be suppressed to a low level.

[Brief description of the drawings]

FIG. 1 is a view showing a processing method of the present invention.

FIG. 2 is a diagram showing a processing state and a processing result.

FIG. 3 is a diagram showing a change in the position of a tool.

FIG. 4 is a schematic block diagram showing a machining program creating device.

FIG. 5 is a flowchart showing a processing program creation process.

FIG. 6 is a flowchart showing a machining program execution process.

FIG. 7 is a diagram showing a cause of a change in a tool edge position.

FIG. 8 is a view showing a conventional processing method.

FIG. 9 is a diagram showing a change in the position of a tool.

FIG. 10 is a diagram showing a processing result by a conventional processing method.

FIG. 11 is a view showing another conventional processing method.

[Explanation of symbols]

10, 12, 14, 16 Tool 20 Processing area 20a, 20b, 20c Area 24 Target shape 30 Work 100 Control unit 200 NC processing machine L2 Correction amount T2, T4, T6, T8, T10, T20, T22, T
24, machining path

Claims (5)

[Claims] 1. A processing method for processing a work target area of a work into a target shape by moving a tool according to a plurality of processing paths, wherein the processing is performed by moving the tool according to a certain processing path, and the processing is performed at least once. A machining method, wherein a tool is moved and machined according to a next machining path other than an adjacent machining path along the path. 2. The machining method according to claim 1, wherein a next machining path other than an adjacent machining path along the machining path is based on the number of tools required to machine a machining target area of the workpiece. A machining method characterized in that the machining paths are separated by the number of paths. 3. The machining method according to claim 1, wherein a shift direction of a tool for shifting from one machining path to the next machining path is a predetermined direction. 4. A processing for creating a processing program for processing a processing target area of the work into a target shape by controlling a relative positional relationship between the work and the tool based on the target shape information. In the program creation device, a path generating means for generating a plurality of processing paths based on the target shape information, and a certain processing path generated by the path generating means are selected, and at least once the selected processing path is selected. A path selecting means for selecting a processing path other than the processing paths adjacent along the path, and a program generating means for generating a processing program in the order of the processing paths selected by the path selecting means. . 5. A machining apparatus for moving a tool based on a machining program having a plurality of machining paths to machine a machining target area of a work into a target shape, wherein the tool is moved according to a certain machining path among the plurality of machining paths. A machining apparatus wherein machining is performed by moving a tool according to a next machining path other than an adjacent machining path along the machining path at least once.