JPH11192572A - Piercing method and device for controlling starting position of piercing in laser beam machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the method and the device that prevents burning of a kenzan (frog) of a work table. SOLUTION: In a laser beam machine equipped with a work table for which plural lines of skids are arranged having multiple kenzans for supporting a workpiece, a part 15 for taking in the piercing position data of a machining program 13 is provided, as are a skid data part 17 in which the shape and arrangement data of the skids are registered, a part 19 for calculating kenzan areas from the piercing position data and the skid data, a comparing and arithmetic processing part 21 which compares the piercing position data and the kenzan area determined by the kenzan area calculating part, and a controlling and processing part 23 which controllably changes the piercing position in accordance with the processing data of the comparing and arithmetic processing part 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piercing method and a piercing start position control device for a laser beam machine.

[0002]

2. Description of the Related Art Piercing is a process in which a pilot hole for starting laser cutting is formed by a laser. For example, when a circular hole is cut in a workpiece,
Laser processing is performed with a small through hole as a pilot hole at the center of the inside of this hole, proceeding while cutting as the approach path from the center position of the pilot hole to the circular cutting path, and proceeding to the cutting path When it reaches, the circular hole is cut around the cutting path. If the product cut out by laser cutting is a product, the above-mentioned start point is provided outside the product.

[0003]

The above-mentioned piercing (Pierci)
ng) The processing is performed by a so-called sword-yama supporting type laser processing machine in which a work is supported by a skid (27) having a large number of sword mountains as in a laser processing machine disclosed in JP-A-6-31477. Sometimes, FIG. 4 (a, b)
As shown in (1), when the piercing position exactly matches the sword mountain portion of the skid (27) (FIG. 4 (a)), there is a problem that the piercing portion is burnt (FIG. 4 (b)) after the piercing. Further, when the burnout of the sword mountain portion of the skid (27) increases, the support state of the work becomes unstable, which is one of the causes of deteriorating the processing accuracy.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a piercing method and a piercing start position for preventing burnout of a blade portion of a skid provided on a work table. A control device is provided.

[0005]

According to a first aspect of the present invention, there is provided a piercing method for a laser beam machine, wherein a plurality of rows of skids having a plurality of sword mountains for supporting the workpiece are arranged. In a piercing method of a laser processing machine equipped with a table, the skid shape data and skid arrangement data of the skid are registered in advance in a skid data section of a control device of the laser processing machine, and the shape data of the skid is formed at the time of piercing. A plurality of sword mountain areas are calculated and obtained by a sword mountain area calculation unit from the array data and the plurality of sword mountain areas are compared with a piercing processing start position at the time of the piercing processing command in a comparison calculation processing unit. When the start position is in any one of the plurality of sword mountain regions, the gist is to change the piercing start position to outside the region. It is intended.

Therefore, when the piercing start position is in the sword mountain area of the skid arranged on the work table, the piercing start position is changed to outside the area, so that the sword mountain can be prevented from burning out.

According to a second aspect of the present invention, there is provided a piercing start position control device, comprising: a laser processing machine provided with a work table having a plurality of rows of skids having a plurality of ridges for supporting a work; A piercing processing position data section for capturing data, a skid data section in which skid shape data and skid array data are registered, a sword mountain area calculating section for calculating a sword mountain area from the piercing processing position data and the skid data, and the piercing processing. A gist comprising a comparison operation processing unit that compares the position data with the sword mountain area calculated by the sword mountain area calculation unit, and a piercing position change control processing unit that changes and controls the piercing position by the processing data of the comparison operation processing unit. Is what you do.

Therefore, if the piercing start position is in the sword mountain area of the skid arranged on the work table, the piercing start position can be automatically changed to outside the area.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic plan view of a work table of a laser processing machine in which skids having a plurality of sword mountains are arranged in a plurality of rows.

[0010] As shown in FIG.
The upper, m pieces skid 3 plate thickness of the steel plate l of which extends in the y-axis direction at a pitch x _p in the x-axis direction are arranged in parallel. Further, as shown in FIG. 1 (b), this is the skid 3 are integrally formed at a pitch y _p more pinholder portion 5 in the y-axis direction for supporting a work (not shown). Therefore,
A total of m × n sword mountains 5 are arranged in a lattice.

In order to express the coordinates of the plurality of sword mountains of the skid by mathematical formulas, in FIG.
_c (x _c , y _c ), and the coordinates of the piercing position are P
_{Let p} (x, y). Also, the m arranged in a lattice pattern
Assuming that the center coordinates of the i-th row in the y-axis direction and the j-th column in the x-axis direction are P _k (x _i , y _j ), the center of the fist mountain P _k The coordinates are represented by the following equation.

[0012]

[Number 1] _{x i = x c - (m} -i) * x p, i = 1,2,3 ... m, ............... (1)

Y _j = y _c − (n−j) * y _p , j = 1,2,3... N,... (2) Therefore, the piercing position P _p (x, y) If the region is not in the region of the following expression (3) or (4), the sword mountain portion will not be burned during piercing.

[0013]

X _i −l / 2 <x <x _i + l / 2, i = 1,2,3... M,... (3)

Y _j −l / 2 <y <y _j + l / 2, j = 1,2,3... N,... (4) FIG. 2 shows a piercing start position control device according to the present invention. FIG. 3 is a system block diagram showing an example of the system.

The piercing processing start position control device 11 sends piercing processing position data P _p (x,
y) piercing processing position data section 15 for taking in, and skid shape data (skid plate thickness 1, number of sword mountains n, pitch of sword mountains y
_p ), skid data section 17 in which skid array data (skid number m, array pitch x _p ) are registered, and a sword mountain area calculation for calculating a sword mountain area (x _i ± l / 2, y _j ± l / 2). And a unit 19.

Based on the data from the piercing processing position data section 15 and the data from the sword mountain area calculating section 19, the piercing processing position P
A comparison operation processing unit 21 for comparing whether or not _p is within the sword mountain area, and a piercing position control processing unit 23 for outputting a command value to the servo amplifier 25 based on the processing data of the comparison operation processing unit 21 X, Y of the laser processing head
The axis servomotors 27 and 29 are connected to the servo amplifier 25.

The above-mentioned sword-yama area calculating section 19 receives the piercing processing position data P _p (x, y) from the processing program section 13.
And skid shape data (skid plate thickness 1, number of sword mountains, sword mountain pitch y _p ) from skid data section 17 and skid array data (skid number m, array pitch x _p )
And the center coordinates (x _i , y _j ) of the sword mountain part P _k are _obtained from the above equations (1) and (2), and the sword mountain area (x _i ± l /
2, y _j ± l / 2) is calculated.

The sword mountain area (x _i ± l / 2, y _j ± l / 2) obtained by the sword mountain area calculation unit 19 and the piercing processing position data P _p (x,
y) is compared with the expression (3) in the comparison operation processing unit 21.
The comparison operation is performed according to (4), and the piercing position P _p (x,
y) is within the range of equations (3) and (4), P _p
The piercing position change movement amount (Δ
(x, Δy).

The piercing position control processing section 23 converts the piercing position P _p (x, y) to P _p ′ (x + Δx, y + Δy).
The laser processing head is driven via the servo amplifier 25 to move the laser processing head to the P _p 'position.

As a result of the comparison in the comparison operation processing section 21, the piercing position P _p (x, y) is calculated by the following equation (3).
If it is outside the area of (4), the processing position P
Perform piercing at _p (x, y). The piercing position change movement amounts Δx and Δy are set to appropriate values such that the position of P _p ′ is located outside the sword mountain area.

FIG. 3 shows the piercing start position control device 1.
3 is a flowchart of a piercing method using No. 1.
In step 1, the piercing coordinates (position) are read, and in step 2, the sword mountain area is calculated and obtained. The calculation of the sword mountain area is performed based on the above-described skid shape data and skid array data.

At step 3, piercing coordinates (position)
Is determined to be within the Kenzan area, and YES
If so, in step 4, the laser processing head is moved by the piercing position change movement amount (Δx) described above. If NO, the piercing is performed at the piercing coordinates (position).

If the piercing coordinates (position) are within the sword mountain area, the piercing position change movement amount may not be fixed depending on the shape or size of the cut hole. For example, if the changed piercing coordinates (position) are outside the cut hole, the product will be defective. In this case, the program must be executed at the piercing position before executing step 4 in the flowchart of FIG. This can be dealt with by displaying a message at the same time as the interruption, and asking the operator whether to move the piercing position.

It is also possible to set a plurality of piercing position changing movement amounts and select the movement amount by a machining program.

[0024]

As will be understood from the above description, according to the first or second aspect of the present invention, if the piercing start position is within the sword mountain area of the skid arranged on the work table, Since the piercing start position is automatically changed to the outside of the area to prevent the sword mountain from burning, the maintenance work of the skid is reduced.

Further, since the support of the work does not become unstable due to the burnout of the sword mountain, the cutting precision is not reduced due to the poor support of the work.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a work table of a laser processing machine that has performed a piercing method according to the present invention. FIG. 1 (a)
Is a plan view, and FIG. 1B is a right side view.

FIG. 2 is a system block diagram showing an example of a piercing start position control device according to the present invention.

FIG. 3 is a flowchart of a piercing method according to the present invention.

FIG. 4 is a view for explaining burnout of a sword mountain during piercing in a sword mountain support type laser beam machine.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 work table 3 skid 5 sword mountain section 11 piercing processing start position control device 13 processing program section 15 piercing processing position data section 17 skid data section 19 sword mountain area calculation section 21 comparison processing section 23 piercing position control processing section 25 servo amplifier 27 X reference position P _p piercing position P _k i-th row and j-th column of the pin holder portion center coordinates servomotors 29 Y-axis servomotor P _c frog section

Claims (2)

[Claims] 1. A piercing method for a laser beam machine provided with a work table having a plurality of rows of skids having a plurality of ridges for supporting a workpiece, the skid shape data and the skid array data of the skids are previously determined. Registered in the skid data section of the control device of the laser processing machine, at the time of piercing processing, a plurality of sword mountain areas are calculated and obtained by the sword mountain area calculation unit from the shape data and array data of the skid,
The plurality of sword mountain areas and the piercing processing start position at the time of the piercing processing command are compared by a comparison calculation processing unit, and when the piercing processing start position is within any of the plurality of the sword mountain areas, A piercing method in a laser beam machine, wherein a piercing processing start position is changed to a position outside a region. 2. A piercing position data section for taking in piercing position data of a processing program section in a laser beam machine provided with a work table having a plurality of rows of skids having a plurality of ridges for supporting a workpiece. A skid data section in which skid shape data and skid array data are registered, a sword mountain area calculation section for calculating a sword mountain area from piercing processing position data and skid data, and a sword mountain area calculated by the piercing processing position data and the sword mountain area calculation section. A piercing processing start position control device, comprising: a comparison operation processing unit that compares an area with a piercing position; and a piercing position change control processing unit that changes and controls a piercing position based on processing data of the comparison operation processing unit.