JPH0486903A - Laser beam machine - Google Patents

Abstract

PURPOSE:To reduce the cutting form error at the time of the acceleration/ deceleration of work by shifting a working path in cutting direction according to a beam radius. CONSTITUTION:The shift operation in the direction of the Y axis of a working torch is successively performed at prescribed time interval from a first reference point P1 to a second reference point P2 on the work. As the result, a working path PAT turns to be little rising to the right according to the amount of extension of a beam radius W1 in an accelerating area ARE1. It turns to be horizontal in a constant speed area ARE2, further, turns to be a little falling to the right in a deceleration are ARE3. Therefore, even when the beam radius W1 changes accompanied by the transitional change of work cutting speed WCS at the time of cutting the work from the first reference point P1 to the second reference point P2, the influence is rarely exerted on the work part of the lower side of the working path PAT. Therefore, cutting line CL on the side of the products of the work can be linearly cut.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a laser processing machine capable of cutting a workpiece into an accurate shape.

(b), Prior Art FIG. 8 is a diagram showing an example of the shape of a work cut by a conventional laser beam machine.

Conventionally, in order to properly laser-process a workpiece with a laser processing machine, the unit length at the cutting part of the workpiece,
Since it is necessary to keep the amount of irradiation energy constant per unit time, the laser output is changed as appropriate depending on the cutting speed of the workpiece.

(C) 0 Problems to be Solved by the Invention However, in such a method, in the acceleration/deceleration region where the cutting speed of the workpiece changes continuously, the beam diameter W1 inevitably changes, as shown in FIG. 8, for example. The result is a change. That is, in the acceleration region ARE1 shown in FIG. 8, from the first reference point P1, which is the acceleration start point, to the third reference point P, which is the acceleration end point.
3, the beam diameter W1 expands toward constant velocity region ARE2.
, the beam diameter W1 is maintained constant and the deceleration area AR
At E3, the beam diameter W changes from the fourth reference point P4, which is the deceleration start point, to the second reference point P2, which is the deceleration end point.
1 shrinks. As a result, the cutting line CL of the workpiece is the beam diameter W1 at the first reference point P1 in the acceleration region ARE1.
□ and the beam diameter Wl at the third reference point P3, (Wl, <
Wl3), and in the deceleration region ARE3, the difference between the beam diameter Wl at the fourth reference point P4 and the beam diameter W1□ (WLAWl□) at the second reference point P2 in the direction perpendicular to the cutting direction. It shifts in the directions of arrows C and D. Therefore, the cutting line CL of the workpiece from the first reference point P1 to the second reference point P2 becomes a broken line, and there is an inconvenience that the workpiece cannot be cut into a desired shape.

In view of the above circumstances, the present invention makes it possible to reduce cutting shape errors during acceleration and deceleration of the workpiece by shifting the machining path in a direction perpendicular to the cutting direction according to the beam diameter when cutting the workpiece. The purpose is to provide laser processing machines.

(d) Means for solving the first problem, that is, the present invention has a first memory means (25) storing a machining program (PRG) in which a workpiece cutting speed (WCS) is stored, and the first memory means (25) are orthogonal to each other. 2 directions (arrows A, B
A laser processing machine provided with a processing means (3, 12) that is relatively movable in directions (directions C and D), and an active means (39, 36) for moving and driving the processing means (3, 12). In (1), a second memory means (33) storing a processing condition file (PCF) storing a beam diameter correction value (cDs) according to the workpiece cutting speed (WCS) is provided, and the first memory The work cutting speed (W) instructed in the machining program (PRG) stored in the means (25)
CS) and the beam diameter correction value (CD) in the processing condition file (PCF) stored in the second memory means (33).
Transient speed correction data calculation and determination means (30) for calculating and determining transient speed correction data (DAT) based on S)
At the same time, the actual speed of cutting the workpiece (Vl, V2, V
3) Actual speed detection calculation means (39a, 3
2), and the transient speed correction data calculation and determination means (
30), the transient velocity correction data (D
AT) and the actual speed of cutting the workpiece (Vl, V2, V3) calculated by the actual speed detection calculation means (39a, 32).
) is provided, and a correction amount calculation and determination means (35) is provided to calculate and determine the correction amount (A1.A2.A3) based on the correction amount calculation and determination means (35).
A2. Based on A3), the driving means (39, 36)
A correction executing means (26) is provided for immediately moving the processing path (FAT) in a direction (direction of arrow C, D) orthogonal to the cutting direction (direction of arrow B).

Furthermore, the present invention has a first memory means (25) storing a machining program (PRG) in which a workpiece cutting speed (WO5) is stored, and has two directions (arrows A, B) orthogonal to each other.
A laser beam processing machine is provided with a processing means (3, 12) that is relatively movable in directions (directions of arrows C and D), and a drive means (39, 36) that drives the processing means (3, 12) to move. In (1), the second memory means (33
), and the workpiece cutting speed (WO2) instructed in the machining program (PRG) stored in the first memory means (25) and the machining condition file stored in the second memory means (33). Transient velocity correction data (DAT) based on beam diameter correction value (CD, ) in (PC:F)
) for calculating and determining transient speed correction data (
30), and the actual speed of cutting the workpiece (Vl, ■
2, V3), and detects and calculates actual speed detection calculation and determination means (
39a, 32.32a) are provided, and the transient speed correction data (DAT) calculated and determined by the transient speed correction data calculation and determination means (30) and the actual speed detection calculation and determination means (39a, 32.32a) are provided. Correction amount/correction direction calculation determining means (35) for calculating and determining the correction amount (Al, A2, A3) and correction direction based on the calculated actual speed (Vl, V2, V3) and acceleration/deceleration state of workpiece cutting.
Based on the correction amounts (Al, A2, A3) and the correction direction calculated and determined by the correction amount/correction direction calculation determining means (35), the driving means (39, 36) are driven to determine the machining path. (FAT) in the correction direction.

Note that the numbers in parentheses are for convenience to indicate corresponding elements in one drawing, and therefore, this description is not limited to the description on the drawing. The same applies to the column "r(e), action" below.

(e) 0 effect With the above-described configuration, the present invention has the following advantages during laser cutting:
The machining path (F
AT) acts to shift.

(f), Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a perspective view showing an embodiment of a laser processing machine according to the present invention.

Figure 2 is a control block diagram of the processing control device installed in the laser processing machine shown in Figure 1. Figure 3 is a schematic diagram showing an example of a processing condition file. Figure 5 is a diagram showing an example of a machining program, and Figure 6 is a diagram showing an example of how a workpiece is laser cut. (a) is a diagram showing the cutting shape of the workpiece, and (b) is a diagram showing changes in cutting speed. figure.

FIG. 7 is a diagram showing an example of transient speed correction data.

A laser processing machine 1 according to the present invention, as shown in FIG.
The machine body 2 has a table 3 on which a workpiece mounting surface 3a is formed in the X-axis direction.
It is supported so that it can be freely moved and driven in the B direction. Also, aircraft 2
A column 5 is provided to straddle the top of the table 3, and in front of the column 5 is a control! 6 is installed.

A saddle 7 is supported on the column 5 so as to be movable in the directions of arrows C and D, which are the Y-axis directions, and a processing head 9 is supported on the saddle 7 so as to be movable in the directions of arrows E and F, which are two-axis directions, that is, in the vertical direction. It is supported so that it can be moved and driven. The processing head 9 includes a laser beam transmission device 10 .

A laser oscillator 11 housed in the column 5 is connected to a processing head 9, and a processing torch 12 is provided at the lower end of the processing head 9. Furthermore, an injection port 12a is formed in the lower part of the processing torch 12, facing downward, that is, toward the table 3.

By the way, as shown in FIG. 1, the laser processing Ia1 is equipped with a processing control device 20.

As shown in FIG. 2, the processing control device 20 includes a main control section 2.
1. The main control unit 21 is connected via a bus line 22 to an input unit 23 such as a keyboard, a system program memory 24. Machining program memory 25, machining control section 26, analysis calculation section 30, speed correction data memory 31. Axis control section 2
7, a laser oscillation control section 29, a feed rate calculation section 32, a processing condition file memory 33, a correction amount calculation determination section 35, etc. are connected. The axis control unit 27 has the table 3
A drive motor 3 that moves in the axial direction (directions of arrows A and B)
9 is connected to the drive motor 39, and the encoder 39 is connected to the drive motor 39.
a is provided to feed back the rotational speed of the drive motor 39 to the shaft control section 27. In addition, the axis control unit 27 is configured to control the saddle 7 in the Y-axis direction (arrow C, D direction).
A drive motor 36 for moving and driving is connected to the drive motor 36 , and an encoder 36 a is provided on the drive motor 36 so as to feed back the rotational speed of the drive motor 36 to the shaft control section 27 . Furthermore, a drive motor 37 that drives the processing head 9 to move in two axial directions (directions of arrows E and F) is connected to the axis control section 27.

The laser oscillator 11 is also included in the laser oscillation control section 29.
is connected, and the feed rate calculation section 32 is provided with a register memory 32a.

In addition, in the machining condition file memory 33 of the machining control device 20 shown in FIG. etc.) and plate thickness (0.6 mm, O, B
mr, 1.2++o, etc.) and are stored with respective unique addresses ADR attached. Below, as an example of the processing condition file PCF, a processing condition file PCF for a workpiece with a soft IN (cold) plate thickness and a plate thickness of 1.2 mm will be explained, but the same applies to other processing condition files PCF. be.

That is, as shown in FIG. 3, the processing condition file PCF for a workpiece of mild steel (cold) and plate thickness 1.2+m has an address ADR of rsPccl, 2J, and the processing condition file PCF is piercing condition table PT
and a cutting condition table CT. In the piercing condition table FT, the workpiece (i.e., 1.2rm thick soft #
Optimal piercing conditions PD when performing a piercing operation on R (cold work) are stored. That is, in the "output (W)" digit in the piercing condition table PT, r500J is the laser output value PD□, and "frequency (H
z) The J digit is the laser frequency PD, as rl OOO
J is the duty PD in the "Duty (%)" digit.
3, that is, the ratio of the pulse width to the pulse period:
20", but the "gas type" digit indicates the assist gas type PD.
, "Oxygen" is "Gas pressure (kg/ci)" The J digit is r2.OJ as the assist gas pressure PDs, and the "Dwell (S)" digit is the piercing completion waiting time PD. rl and OJ are stored respectively. Therefore, when a laser beam with an output of 500 W, a frequency of 1000 Hz, and a duty of 20% is irradiated with oxygen at a pressure of 2.0 kg/d for 1.0 seconds, the laser processing machine 1 This shows that it is possible to perform an appropriate piercing operation on the workpiece (in between).

Furthermore, the cutting condition table CT in the processing condition file PCF shown in FIG. "5000J,"4500
A numerical value such as J, -=-1 "500" is stored as the workpiece cutting speed WC5, and the workpiece cutting speed WC5 is also stored as the workpiece cutting speed WC5.
8, the optimum cutting conditions CD for cutting the workpiece at the workpiece cutting speed WC8 are stored. In the first cutting condition step O5□ where r5000J is stored, the laser output value CD is stored in the "output (W)" digit, and rl OOOJ is stored in the "frequency (H)" digit.
2) In the J digit, enter the laser frequency CD2 as rl O00J.
However, in the "Duty (%)" digit there is the duty CD, rloOJ, in the "Gas type" digit the assist gas type CD, "Oxygen", and in the "Gas pressure (kg/d) J" digit. The pressure CD of the assist gas is r2.

Since 10J is stored in each case, 5000 of the above-mentioned workpieces, that is, 1.2mm thick mild steel (cold) workpieces, are stored.
When cutting at WIa/win speed.

A laser beam with an output of 1000 W and a frequency of 1000 Hz and a pressure of 2.0 kg/a! 0,1 from the cutting path with oxygen of
It is shown that the laser processing machine 1 can properly cut the workpiece when irradiation is performed while maintaining the offset state by olII11. This corresponds to "Speed (mm/m1n)" in the cutting condition table CT.
The same applies to the cutting condition step C8 in which a value other than r5000J (for example, "4500J, r500J)" is stored as the workpiece cutting speed WC8 in the J digit.

Since the laser processing machine 1 has the above-described configuration, when processing a plate-shaped workpiece using the laser processing machine 1, one operator must use the laser processing machine shown in FIG. 1 to process the workpiece. The workpiece is placed on the workpiece mounting surface 3a of the table 3 of No. 1, and in that state, the workpiece number WN○ (for example, "○
oool'') and the plate volume number KN and plate thickness number TN corresponding to the plate volume and plate thickness of the work to be machined, respectively, to the main control unit 21 to create a machining program PRG and to instruct the main control unit 21 to create a machining program PRG. command processing based on Then, the main control unit 21 reads the processing management program PCP from the system program memory 24, and performs laser processing on the workpiece based on the read processing management program PCP.

That is, the main control unit 21 reads the machining program PRG corresponding to the input workpiece number WHO from the machining program memory 25 in step S1 of the machining management program PCP shown in FIG. The plate volume number KN and plate thickness number TN inputted above are loaded into PRG as parameters, and a machining program PRG corresponding to the plate volume and thickness of the workpiece is created.

In this way, the machining program PRG loaded with the plate number KN and plate thickness number TN of the workpiece to be machined is 1.
For example, as shown in FIG.
The first step P at the top in the figure
ro 0OOIJ is stored in S□ as a workpiece number WNO specific to the machining program PRG.

2nd machining step P directly below the 1st machining step PS machining
S2 includes rG22 machining I as machining condition selection command pcc.
J4J is stored, and the corresponding machining condition selection command PCCr
G22IIJ4j (7) rG22J is the second
This means that the machining step PS2 is a step for instructing selection of machining conditions. Further, the number following the code (■) is the input plate volume number KN, and the plate volume number KN of "1" means that the plate volume of the workpiece to be machined is mild steel (cold steel). Further, the number following the J code is the input plate thickness number TN, and the plate thickness number TN "4" means that the plate thickness of the workpiece to be machined is 1.2 mm.

Further, below the second machining step PS2 in the machining program PRG shown in FIG.
is stored. Since rG76J is stored as the piercing command PLC in the fifth modification step PS5 at the top of the piercing command block PCB, the fifth modification step PSs is the same as the second modification step PS2.
Based on the liquid type number KN and plate thickness number TN commanded in the process, the corresponding machining condition file PCF is read out, and the piercing condition table P of the read machining condition file PCF is read out.
Read each numerical value etc. in T as piercing condition PD,
It is instructed to perform a piercing operation based on the read piercing condition PD.

Furthermore, below the piercing command block PCB, there is stored a cutting command block CCB starting from the 8th cutting step PS in the 8th row from the top. Nistep PS, rGOIX60YOF5000 as disconnection command CUC.
is stored in the tail. i Cutting command CUCrG 01 X6
0 Y I'co IJ in OF5000J means linear interpolation operation, and the numbers following the X code and Y code are respectively.

represents the X and Y coordinates of the end point of linear interpolation, and furthermore, F
The number following the code represents the workpiece cutting speed WC8. Therefore, the eighth machining step PSs instructs linear interpolation to be performed at a cutting speed of 5000 mm/min to a point 60 m away from the predetermined program origin in the X-axis direction. Further, a plurality of cutting commands CUC are sequentially stored after the eighth cutting step PSll.

Note that the distinction between the product side and non-product side of the workpiece, that is, which side is the product side in the cutting direction of the workpiece, is determined in the machining program PRG or in an appropriate memory using parameters or control codes. is stored in.

In this way, when the machining program PRG corresponding to the liquid type number KN and plate thickness number TN is created, the main control unit 2
1 instructs the machining control unit 26 to execute machining based on the created machining program PRG, and the machining control unit 26
is the liquid type number K following the X code in the machining condition selection command pcc commanded by the created machining program PRG.
The address ADH (liquid type number KN is “1” and the plate thickness If the number TN is "4".

rsPccl, 2J). Furthermore, the processing condition file PCF having the generated address ADH is read from the processing condition file memory 33, and the processing conditions stored in the read processing condition file PCF, that is, the piercing conditions PD and the cutting conditions CD are read. Based on this, machining is executed based on the read machining program PRG.

That is, first, in the second machining step PS2 in the machining program PRG shown in FIG.
Since rG22IIJ4J is stored as cc, the machining control unit 26 determines that the machining to be performed from now on has a plate thickness of 1.
Recognizing that the work is to be performed on a 2mm mild steel (cold) workpiece, rS is the address ADR corresponding to the processing.
PCC1.

2'' as a search key, the machining condition file PCF for a mild steel (cold) workpiece with a plate thickness of 1.2 m, that is, the machining condition file PCF shown in FIG. 3 is read out from the machining condition file memory 33.

Next, the machining control unit 26 executes the piercing command P stored in the fifth step PS at the top of the piercing command block PCB in the machining program PRG shown in FIG.
Based on LCrG76J, a plurality of piercing conditions FD stored in the piercing condition table PT in the read machining condition file PCF (that is, the machining condition file PCF shown in FIG. 3), that is, "output (W 00J "Frequency (Hz)" laser frequency FD is stored in the J digit.

rl OOOJ stored as ``Duty (%)
“20” is stored as the duty PD in the digit of “20”.
"Oxygen" is stored as the assist gas type PD in the "Gas type" digit, r2.OJ is stored as the assist gas pressure PD in the J digit, and "dwell ( rl and OJ stored in the digit of "S)" as the piercing completion waiting time PD are outputted to the laser oscillation control section 29 to instruct the start of the piercing operation.

Then, the laser oscillation control unit 29 performs a laser oscillation operation on the workpiece on the workpiece mounting surface 3a of the table 3 based on the output piercing condition PD via the laser oscillator 11, and displays the result.

As shown in FIG. 6(a), the first reference point P1 on the workpiece
In this step, a piercing operation is performed based on these output piercing conditions PD.

In this way, after the piercing operation is completed at the first reference point P1 on the workpiece, the machining control unit 26 selects the eighth machining step PSll in the cutting command block CCB in the machining program PRG shown in FIG. Based on the workpiece cutting speed WC5r5000J following the F code in the cutting command CUCrGOIX6OYOF5000J, the compared machining condition file PCF (i.e., the third
Cutting condition table CT in the processing condition file PCF shown in the figure
Among the plurality of cutting condition steps C8 stored in ``
First cutting condition step CS where “5000” is stored as workpiece cutting speed WC8 in the speed (■/m1n) J digit
Select □, and in each cutting condition CD of the selected first cutting condition step CS machining, rlooOJ and “Frequency (
Hz) stored as the laser frequency CD in the J digit.
1000”, duty C in the “Duty (%)” digit
rlOOJ stored as D, assist gas type CD stored in the "gas type" digit, "oxygen" and "gas pressure (kg/a ()) stored as assist gas pressure CD in the J digit. The obtained r2.04 is outputted to the laser oscillation control section 29 to instruct the start of cutting operation.At the same time, the processing control section 26 outputs the r2.04.

Based on the cutting command CUCrGOIX60YOF5000J, a machining path from the first reference point P1 to the second reference point P2 on the workpiece is calculated, and a control command based on the calculated machining path is output to the axis control unit 27.

Then, the laser oscillation control unit 29 performs a laser oscillation operation based on the output cutting condition CD via the laser oscillator 11, and the axis control unit 27 operates the drive motor 39 based on the pressured control command. via table 3
is driven to move in the direction of the arrow in FIG. 1, which is the X-axis direction. As a result, the output is applied to the workpiece on the workpiece mounting surface 3a of the table 3 in a straight line from the first reference point P1 to the second reference point P2 in the direction of arrow B, as shown in FIG. 6(a). A workpiece cutting operation is performed based on the cutting conditions CD determined.

At this time, the moving speed of the table 3 in the direction of the arrow hole in Figure 1 is:
Due to the influence of table 3's inertia, etc., the command value of 5
000 m/win is not possible, and as shown in Figure 6 (
As shown in b), from the first reference point P1 to the second reference point P2
Until the third reference point P3 on the way to , the table 3 is transiently accelerated from zero to 5 ooo k/min. After that, from the third reference point P3 to the fourth reference point P4 before the second reference point P2, the table 3 is 5000 wn/wi.
Move at a constant speed of n. Furthermore, from the fourth reference point P4 to the second reference point P2, the table 3 has a speed of 5000 mm/win.
It is transiently decelerated from 0 to 0, and is finally positioned at the position of X=60 commanded by the machining program PRG. Then, the beam diameter W1, which determines the cutting width of the workpiece, changes in accordance with the transient change in the moving speed of the table 3, as shown in FIG. 6(a).

That is, in the acceleration region ARE1 from the first reference point P1 to the third reference point P3 on the workpiece, the beam diameter W1 gradually expands in the upper and lower directions in the figure with respect to the machining path FAT on the machining program PRG. .

Constant speed area AR from third reference point P3 to fourth reference point P4
At E2, the beam diameter W1 is maintained at a constant value, and the deceleration area A from the fourth reference point P4 to the second reference point P2 is
At RE3, the beam diameter W1 will gradually decrease.

Therefore, in order to cut the workpiece with high precision, the processing path FAT is appropriately shifted to the non-product side, that is, in the direction of arrow C, which is perpendicular to the direction of arrow B, which is the cutting direction, according to the moving speed of the table 3. By doing so, the workpiece is cut in a manner that reduces the shape error on the product side of the workpiece due to a change in the beam diameter W1 during workpiece cutting.

For this purpose, the cutting command CUCrG stored in the eighth machining step PS6 in the machining program P'RG shown in FIG.
When executing the cutting operation based on "OIX60YOF5000", the process enters step S2 of the process control program PCP shown in FIG.
0mn/win is output to the feed speed calculation unit 32, and the transient speed correction data DAT is output to the analysis calculation unit 30.
command the creation of Then, the feed speed calculation unit 32 calculates the output workpiece cutting speed WC8, that is, 5000 m.
+/win is stored internally. On the other hand, the analysis calculation unit 30 selects "speed ( m/
win) r50 as workpiece cutting speed WC8 in J digit
Select the first cutting condition step C5 in which 00J is stored.

Among each cutting condition CD of the selected first cutting condition step C81, the beam diameter correction value CD is placed in the “correction (I)” digit,
Based on the stored ro, IOJ, r5000J which is the workpiece cutting speed WC8, and the current cutting speed (“0” because it is during piercing), transient speed correction data DAT as shown in FIG. 7 is generated. The generated transient speed correction data DAT is stored in the speed correction data memory 31. This transient speed correction data DAT is
As shown in FIG. 7, on the orthogonal coordinate system consisting of the horizontal axis representing the workpiece cutting speed WC5 and the vertical axis representing the beam diameter correction value CD, the workpiece cutting speed WC8 is r5000J, and the beam diameter correction value CD is " This is a graph connecting the point P5, which is 0, IOJ, and the origin O with a straight line, and according to the transient speed correction data DAT, 0 (piercing) to 5000
A beam diameter correction value CD corresponding to an arbitrary workpiece cutting speed WC8 within the range of I/min can be determined.

In this way, the workpiece cutting speed WCS (5000
m+/m1n) and the beam diameter correction value CD s at that time
(0, l Oam) When the transient speed correction data DAT created based on
Step S3 is entered, and the feed rate calculation unit 32 controls the drive motor at predetermined time intervals (however, the time intervals are significantly shorter than the time from the first reference point P1 to the third reference point P3). Based on the motor rotational speed detected by the encoder 39a provided in the encoder 39, the moving speed of the table 3 in the direction of arrow B, that is, the actual speed v1 of cutting the workpiece in the direction of arrow B, is calculated, and the calculated actual speed is calculated. v1 and the workpiece cutting speed W stored in the feed speed calculation section 32
The acceleration/deceleration state of the drive motor 39 is determined based on C8, that is, 5000 wn/in. That is, if the actual speed v1 calculated at a certain point has not reached the workpiece cutting speed WC8 stored in the feed speed calculation section 32, it is determined that the state is in an accelerated state, and "O" representing the accelerated state is determined. is stored in the register memory 32a as acceleration/deceleration information INF.

Further, when the calculated actual speed (1) reaches the workpiece cutting speed WC8 stored in the feed speed calculation section 32, it is determined that the speed is constant, and the register memory 32a
The acceleration/deceleration information INF in is left unchanged at "0". Further, if the calculated actual speed v1 reaches the workpiece cutting speed WC8 stored in the feed speed calculating section 32 and then decreases, it is determined that the deceleration state is in progress, and the value "1" representing the deceleration state is determined. " is stored in the register memory 32a as acceleration/deceleration information INF.

In this way, the actual speed V1 of cutting the workpiece at a certain point in time is calculated, and the acceleration/deceleration information INF is stored in the register memory 32a.
When the processing management program PCP is stored in step S4 shown in FIG.
rOJ or “1”) is output to the correction amount calculation determining unit 35. In response to this, the correction amount calculation determining unit 35 calculates the transient speed correction data D stored in the speed correction data memory 31.
AT (i.e., transient speed correction data DA shown in FIG.
T), and based on the read transient speed correction data DAT, a correction amount A1 corresponding to the output actual speed v1 is calculated as shown in FIG. Furthermore,
The correction amount calculation determining unit 35 uses the output acceleration/deceleration information I.
A correction direction is determined based on NF. That is, when "O" representing the acceleration state is output as the acceleration/deceleration information INF, the direction of arrow C, which is the positive direction of the Y axis, that is, the direction of the non-product side of the workpiece specified in advance by the machining program PRG, etc. When the correction direction is determined and "1" representing the deceleration state is output as the acceleration/deceleration information INF, the direction indicated by the arrow, which is the negative direction of the Y-axis, that is, the product of the workpiece specified in advance by the machining program PRG, etc. The lateral direction is determined as the correction direction.

In this way, the correction amount A1 corresponding to the calculated actual speed v1
is calculated and the correction direction is determined,
Step S5 of the processing control program PCP shown in FIG.
Then, the correction amount calculation and determination unit 35 outputs the calculation-determined correction amount A1 and correction direction to the processing control unit 26. In response to this, the processing control unit 26 outputs the output correction amount A1.
and the correction direction to the axis control unit 27, and the saddle 7
is commanded to move in the direction of arrow C in FIG. 1 by a correction amount A1. Then, the axis control section 27 drives the saddle 7, and thus the processing torch 12, in the direction of arrow C by the output correction amount A1 via the drive motor 36. Then, as shown in FIG. 6(a), the machining path FAT is such that the machining point moves a predetermined distance L1 from the first reference point P1 in the direction of arrow B, which is to the right in the figure.
while reaching the point P6 corresponding to the calculated actual speed v1, the correction amount A1, that is, the beam diameter W1 is applied upward in the figure, that is, in the direction of arrow C perpendicular to the cutting direction (direction of arrow B). is shifted by the amount of expansion. Next, when moving and cutting from point P6 to point P7, the processing control program PCP
After repeating each operation in steps S3 to S5 and calculating the correction amount A2 corresponding to the actual speed v2 at point P7, the difference ΔA (=A2) between the correction amount A2 and the correction amount A1 at the point P6 is calculated. -Al) further shifts the machining path FAT in the direction of arrow C. Then, as shown in FIG. 6(a), point P7 is shifted by the correction amount A2 in the direction of arrow C from the reference machining path FAT' set by the machining program PRG or the like. Similarly, when the cutting operation accompanied by such a shift operation is sequentially performed at the predetermined time interval in the acceleration area ARE1 from the first reference point P1 to the third reference point P3 on the workpiece, the machining path is changed. FAT is each point P1 in the acceleration region AREl,
Although the shape is stepped upward to the right in the figure in accordance with the beam diameter W1 at P6, P7, etc., since the distance L1 between two adjacent points is sufficiently short, it can be regarded as approximately a straight line. As a result, the cutting line CL on the lower product side of the workpiece from the first reference point P1 to the third reference point P3 in FIG.
F is cut parallel to the shape.

In this way, when the cutting process of the workpiece reaches the third reference point P3, the process returns to step S3 of the process control program PCP shown in FIG. Perform the calculation. As shown in FIG. 6(b), the actual speed of cutting the workpiece at the third reference point P3 has reached the workpiece cutting speed WCS stored in the feed rate calculation section 32, that is, 5000 mm/win. , the actual speed of cutting the workpiece is 5000 mad.
/win is calculated.

Next, in step S4 of the processing management program PCP, the correction amount calculation determining unit 35 calculates a correction amount corresponding to the calculated actual speed based on the transient speed correction data DAT shown in FIG. As mentioned above, since the actual speed has already reached 5 000 mm/min, which is the workpiece cutting speed WC8, the constant speed area ARE up to the fourth reference point P4 is
Within Z, all correction amounts are calculated as 0.10 ma+.

Next, in step S5 of the processing management program PCP, the process moves to a correction operation, since the calculated correction amounts are all constant values (0, 10m).

Since the difference ΔA between these correction amounts is zero, the saddle 7
, therefore, the processing torch 12 is not driven in the Y-axis direction, and the correction amount at the third reference point P3, that is, 0.10 m.
It is held at m. As a result, the machining path FAT in the constant speed area ARE2 is shifted from the reference machining path FAT' by O, Loan in the direction of arrow C, as shown in FIG. 6(a), over the entire constant speed area ARE2. maintain each other. Thereby, the cutting line CL on the product side of the workpiece between the third reference point P3 and the fourth reference point P4 is also cut parallel to the standard machining path FAT' with a predetermined offset OFF.

In this way, when the cutting process of the workpiece reaches the fourth reference point P4, the process returns to step S3 of the process management program PCP shown in FIG. Based on the motor rotational speed detected by the encoder 39a provided at The acceleration/deceleration state of the drive motor 39 is determined based on the workpiece cutting speed WC8 stored in the feed speed calculating section 32, that is, 5000 m++/min. That is, from the fourth reference point P4 onward, as shown in FIG. 6(b), the workpiece cutting speed WCS up to that point, that is, 5000 m
Since the deceleration area ARE3 is from m/min to zero, the actual speed calculated by the feed speed calculation section 32 is the workpiece cutting speed WC8 stored in the feed speed calculation section 32.
will be lower than Then, the feed rate calculation unit 32 determines that the current state is a deceleration state, and the feed rate calculation unit 32 determines that the current state is a deceleration state, and the "
1'' is updated and stored in the register memory 32a as acceleration/deceleration information INF.

In this way, when the actual speed V3 of cutting the workpiece at a certain point in time is calculated and the acceleration/deceleration information INF, that is, "1" is stored in the register memory 32a, the process enters step S4 of the processing control program PCP shown in FIG. , the feed speed calculation unit 32 outputs the calculated actual speed v3 and acceleration/deceleration information INF, ie, “1” to the correction amount calculation determination unit 35.

In response to this, the correction amount calculation determining unit 35 calculates the transient speed correction data DA stored in the speed correction data memory 31.
T (i.e., the transient speed correction data DAT shown in FIG.
), and the read transient speed correction data D
Based on AT, as shown in FIG. 7, a correction amount A3 corresponding to the outputted actual speed v3 is calculated. Further, the correction amount calculation determining unit 35 uses the output acceleration/deceleration information IN.
Based on F, ie, "1", the direction indicated by the arrow which is the negative direction of the Y axis, ie, the product side direction of the workpiece specified in advance by the machining program PRG, etc., is determined as the correction direction.

In this way, when the correction amount A3 at the certain point in time is calculated and the correction direction is determined, the process enters step S5 of the processing control program PCP shown in FIG. The correction amount A3 and the correction direction (arrow direction) are output to the processing control section 26. In response to this, the processing control unit 26 outputs a difference ΔA (=0.
The axis controller 27 is instructed to move the saddle 7 by 10 mm - A 3 ) in the direction of the arrow. Then, the axis control section 27 drives the saddle 7, and thus the processing torch 12, in the direction of the arrow by the difference ΔA in the correction amount via the drive motor 36. Then, as shown in FIG. 6(a), the machining path FAT moves the machining point a predetermined distance L2 from the fourth reference point P4 in the direction of arrow B, which is to the right in the figure, and reaches the actual speed ■3.
The difference in correction amount ΔA, i.e., the beam diameter W1, is lower in the figure, i.e., in the direction of the arrow perpendicular to the cutting direction (direction of arrow B), while reaching the processing position at the time when P8 is calculated, i.e., point P8.
is shifted by the amount of reduction. As a result, point P8 is shifted by the correction amount A3 in the direction of arrow C from the reference machining path FAT'. Similarly, when the cutting operation accompanied by such a shift operation is sequentially performed at the predetermined time interval in the deceleration area ARE3 from the fourth reference point P4 to the second reference point P2 on the workpiece, the machining path is changed. F
AT is.

Depending on the beam diameter w1 at each point in the deceleration region ARE3, the beam forms a step-like shape that descends to the right in the figure, but since the distance between two adjacent points is sufficiently short, it can be approximately regarded as a straight line. . As a result, the cutting line CL on the product side of the workpiece from the fourth reference point P4 to the second reference point P2 is also cut parallel to the standard machining path FAT' with a predetermined offset OFF.

In this way, when the workpiece has been cut to the second reference point P2, the eighth point in the machining program PRG shown in FIG.
Cutting command CUCrG0 stored in cutting step PS8
The cutting operation based on "1X60YOF5000" is completed.

In this way, when the processing torch 12 is shifted in the Y-axis direction from the first reference point P1 to the second reference point P2 on the workpiece at the predetermined time interval, the processing path FA
As shown in FIG. 6(a), T increases to the right in the figure in accordance with the amount of expansion of the beam diameter W1 in the acceleration region ARE1, and becomes horizontal in the figure in the constant speed region ARE2.
Furthermore, in the deceleration region ARE3, the beam angle decreases to the right in the figure in accordance with the amount of reduction of the beam diameter W1. Therefore, the workpiece
When cutting from the reference point P1 to the second reference point P2, the beam diameter W1 changes due to a transient change in the workpiece cutting speed WCS.
Even if the angle changes, it will hardly affect the product side of the workpiece, that is, the workpiece part below the machining path FAT shown in Fig. 6(a), and the cutting line CL on the product side of the workpiece will be kept almost in a straight line. It becomes possible to perform cutting. Note that a certain offset OFF with respect to the standard machining path FAT' always occurs between the first reference point P1 and the second reference point P2, but this offset OFF can be corrected by a known offset correction.

In addition, in the above-mentioned embodiment, the present invention is applied until the actual speed reaches the predetermined workpiece cutting speed WC8 from the state of rQJ.
Although the case where the processing path FAT is corrected has been described, the present invention can be applied to all cases where the beam diameter W1 changes due to a change in cutting speed. In this case, the transient speed correction data DAT is created as shown in FIG. 7 for the cutting speeds WC8 and WCS2 before and after the change, and the correction amount AX is determined according to the cutting speed WCS in the transient state.

Furthermore, in the above-described embodiment, as shown in FIG. 6(a), the case where the workpiece is cut in the direction of arrow B, which is the Similarly, in the case of cutting in the composite direction of the X and Y axes, laser processing can be performed in a manner that reduces shape errors on the product side due to changes in the beam diameter W1 when cutting the workpiece. Therefore, when cutting the workpiece into any shape, it is possible to cut the workpiece into almost the desired shape.

(g) 3 As described in detail of the invention, according to the present invention, the workpiece cutting speed W
It has a first memory means such as a machining program memory 25 that stores a machining program PRG stored in C8, and is capable of moving in two directions perpendicular to each other (for example, the directions of arrows A and B and the directions of arrows C and D in FIG. 1). relatively movable table 3,
In a laser processing machine 1 that is provided with a processing means such as a processing torch 12 and a drive means such as a drive motor 39, 36 for moving and driving the processing means, a beam diameter correction value CD corresponding to a workpiece cutting speed WC8 is stored. The second part of the machining condition file memory 33 etc. that stores the machining condition file PCF that has been
a workpiece cutting speed WC8 instructed in the machining program PRG stored in the first memory means and a beam diameter correction value CD in the machining condition file PCF stored in the second memory means; , an analysis calculation unit 3 that calculates and determines the transient speed correction data DAT based on .
In addition to providing means for calculating and determining transient speed correction data such as 0, actual speed detecting and calculating means such as an encoder 39a for detecting and calculating actual speeds 1, v2, and v3 of workpiece cutting, and a feed speed calculating section 32 are provided. Transient speed correction data DA calculated and determined by the transient speed correction data calculation and determination means
T and the actual speeds of cutting the workpiece Vl, V2. calculated by the actual speed detection calculation means. Correction amount A1 based on V3,
A correction amount calculation and determination means such as a correction amount calculation and determination section 35 which calculates and determines A2, A3 is provided, and the correction amounts A1, A2 . Based on A3,
The driving means is driven to move the machining path FAT in the cutting direction (
For example, since the structure is provided with correction execution means such as the processing control unit 26 that shifts in a direction perpendicular to the arrow B direction in FIG. 6 (for example, the direction of arrows C and D in FIG. 6), Actual speed of workpiece cutting ■1, V2. The processing path FAT can be shifted in accordance with a change in the beam diameter W1 due to a transient change in V3. As a result, even in a region where the workpiece cutting speed wcs changes transiently, it is possible to cut the product side of the workpiece into a substantially desired shape, which can contribute to improving the dimensional accuracy of the workpiece.

Further, the first memory of the machining program memory 25, etc., which stores the machining program PRG with the workpiece cutting speed WC8.
memory means, and has two memory means perpendicular to each other (for example,
Processing means such as a table 3 and a processing torch 12 that are relatively movable in the directions of arrows A and B and C and D in FIG. 1 are provided, and a drive motor 39.3 drives the processing means to move.
In the laser processing machine 1 having a number of driving means such as 6, etc., a second memory means such as a machining condition file memory 33 storing a machining condition file PCF storing a beam diameter correction value CD6 corresponding to a workpiece cutting speed WC8 is provided. provided, said first
Transient speed correction data based on the workpiece cutting speed WC8 instructed in the processing program PRG stored in the memory means of and the beam diameter correction value CD in the processing condition file PCF stored in the second memory means. In addition to providing transient speed correction data calculation and determination means such as an analysis calculation unit 30 for calculating and determining DAT, the actual speed v1 of cutting the workpiece,
V2. Actual speed detection calculation and determination means such as an encoder 39a, a feed speed calculation unit 32, and a register memory 32a are provided to detect and calculate V3 and determine whether the state is an acceleration state or a deceleration state, and the transient speed correction data is Transient speed correction data DAT calculated and determined by the calculation determining means
and the actual speed V1 of cutting the workpiece calculated and determined by the actual speed detection calculation and determination means. V2. Based on V3 and acceleration/deceleration state, correction amounts A1, A2. A correction amount/correction direction calculation determining means such as a correction amount calculation/determination section 35 for calculating and determining the correction amount/correction direction is provided, and the correction amounts A1, A2, A3 and Based on the correction direction, the driving means is driven to change the machining path F.
If a correction execution means such as a processing control unit 26 for shifting AT in the correction direction is provided, changes in the beam diameter W1 due to transient changes in the actual cutting speeds v1, v2, and v3 of the workpiece during laser cutting can be realized. The shifting operation of the machining path FAT according to the acceleration/deceleration state can always be performed in the appropriate correction direction.

As a result, even when cutting workpieces into complex shapes,
It becomes possible to cut the product side of the work into a substantially desired shape, which can contribute to improving the dimensional accuracy of the work.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of a laser processing machine according to the present invention. FIG. 2 is a control block diagram of the processing control device installed in the laser processing machine shown in FIG. 1, FIG. 3 is a schematic diagram showing an example of a processing condition file, and FIG. 4 is a flowchart showing an example of a processing management program. Fig. 5 is a diagram showing an example of a machining program, and Fig. 6 is a diagram showing an example of how a workpiece is cut by laser. Figure 7 is a diagram showing an example of transient speed correction data. Figure 8 is a diagram showing an example of the shape of a workpiece cut by a conventional laser processing machine. 1... Laser processing machine 3...Processing means (table) 12...Processing means (processing torch) 25...
- First memory means (machining program memory) 26... Correction execution means (machining control section) 3o...
. . . Transient speed correction data calculation and determination means (analysis calculation section) 32 . . . Actual speed detection calculation means, actual speed detection calculation determination means (feed speed calculation section) 32a . . . Actual speed Detection calculation determination means (register memory) 33... Second memory means (processing condition file memory) 35... Correction amount calculation determination means, correction amount/correction direction calculation determination means (correction amount Calculation determination part) 36.39...
. . . Drive means (N-motor) 39a . . . Actual speed detection calculation means, actual speed detection calculation judgment means (encoder) A1. A2, A3...Correction amount CD,...Beam diameter correction value DAT...Transient speed correction data FAT...
... Machining path PCF ... Machining condition file PRG ... Machining programs v1, v2, V3 ... Actual speed of cutting the workpiece WC
8... Work cutting speed applicant Yamazaki Mazak Co., Ltd. agent Patent attorney Phase 1) Shinji Diagram CP A Otsuri Visit Diagram

Claims (2)

[Claims] (1) A first memory means that stores a machining program in which a work cutting speed is stored, and a machining means that is relatively movable in two mutually orthogonal directions, and a drive that drives the machining means to move. A laser processing machine is provided with a second memory means storing a machining condition file in which a beam diameter correction value corresponding to a workpiece cutting speed is stored, and a machining program stored in the first memory means is provided. and transient speed correction data calculation and determination means for calculating and determining transient speed correction data based on the workpiece cutting speed instructed by and the beam diameter correction value in the processing condition file stored in the second memory means. , an actual speed detection and calculation means for detecting and calculating the actual speed of cutting the workpiece, and the transient speed correction data calculated and determined by the transient speed correction data calculation and determination means and the workpiece calculated by the actual speed detection and calculation means. A correction amount calculation and determination means is provided for calculating and determining a correction amount based on the actual cutting speed, and the driving means is driven to cut the machining path based on the correction amount calculated and determined by the correction amount calculation and determination means. A laser processing machine configured with a correction execution means for shifting in a direction perpendicular to the direction. (2) a first memory means storing a machining program storing a workpiece cutting speed; a machining means movable relatively in two mutually orthogonal directions; and a drive for driving the machining means to move. A laser processing machine is provided with a second memory means storing a machining condition file in which a beam diameter correction value corresponding to a workpiece cutting speed is stored, and a machining program stored in the first memory means is provided. and transient speed correction data calculation and determination means for calculating and determining transient speed correction data based on the workpiece cutting speed instructed by and the beam diameter correction value in the processing condition file stored in the second memory means. , an actual speed detection calculation and determination means is provided for detecting and calculating the actual speed of cutting the workpiece and determining whether the cutting state is an acceleration state or a deceleration state, and the transient speed correction data calculation and determination means calculates and determines the a correction amount and correction direction calculation determining means for calculating and determining a correction amount and correction direction based on the target speed correction data and the actual speed and acceleration/deceleration state of workpiece cutting calculated and determined by the actual speed detection calculation and determination means; A laser processing machine comprising a correction executing means for driving the driving means to shift a machining path in the correction direction based on the correction amount and correction direction calculated and determined by the correction amount and correction direction calculation determining means.