JPH1043878A - Laser beam machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the heat of a coil part in a linear motor, to suppress the lowering of thrust of the linear motor, to maintain its precision, and to prevent dust from accumulating on a magnetic part. SOLUTION: The machine is provided with a linear motor consisting of a magnetic part 15B installed in a fixed object and a coil part 15A installed in a movable object, for the purpose of moving a movable object such as a working table 5 or a laser machining head against the fixed object such as a bed 3 or a frame in the laser beam machine; cooling water or air is supplied to the cooling path 21 formed in the movable object so that the heat is suppressed of the coil part 15A in the linear motor and that the temperature rise is prevented of the movable object. In addition, an air injecting port 23 is provided in the lower part of the movable object at both ends in the coil part 15A, dividing the outlet 23A of the port 23 into a first outlet 25 in the direction jetting to the coil part 15A and a second outlet 27 in the direction in jetting to the magnetic part 15B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser processing machine in which a moving object such as a processing table or a laser processing head is moved by a linear motor.

[0002]

2. Description of the Related Art As a conventional laser beam machine, a laser beam is machined by moving a machining table on which a workpiece to be machined is mounted in an X-axis direction and a laser machining head in a Y-axis direction. A type in which a processing table on which is mounted is fixed and a laser processing head is moved in the X-axis direction and the Y-axis direction to perform laser processing on a work is typically well known.

A drive system for moving the processing table and the laser processing head includes a drive motor, a ball screw,
Coupling and the like are used.

[0004]

By the way, moving objects such as a processing table and a laser processing head are moved by the above-mentioned conventional driving motor and ball screw. It is consumed by drive systems such as ball screws and couplings, and also causes backlash. Further, when the maximum speed is set due to a critical speed or the like, there is a limit in a ball screw. Therefore, the moving object cannot be moved at a certain speed or higher, and the speed cannot be increased.

A linear motor may be used as a means for moving the moving object at a high speed. A linear motor is provided with a magnet part (magnet plate) on a fixed side and a slider having a coil part mounted on a movable side. Is provided.

However, since the thrust is reduced due to the heat generated by the slider, the maximum thrust of the linear motor cannot be obtained. In addition, if iron dust adheres to the magnet plate and the slider, the thrust is reduced.

Further, the slider is moved by exciting the coil portion. At that time, the slider generates heat. As a result, heat is transmitted to the movable portion to which the slider is attached, causing thermal expansion, and a predetermined accuracy cannot be obtained.

An object of the present invention is to prevent heat generation in a coil portion of a linear motor, suppress a decrease in thrust of the linear motor, maintain accuracy, and prevent dust from accumulating on a magnet portion. An object of the present invention is to provide a laser beam machine.

[0009]

According to a first aspect of the present invention, there is provided a laser beam machine according to the present invention. In order to move the moving object, a linear motor consisting of a magnet unit provided on the fixed object and a coil unit provided on the moving object is provided, suppressing the heat generation of the coil unit in this linear motor and reducing the temperature of the moving object. In order to prevent this, cooling water or air is supplied to a cooling passage formed in the moving object.

Therefore, by exciting the coil section provided on the moving object with respect to the magnet section provided on the fixed object of the linear motor, the moving object processing table or laser processing is performed on the fixed object bed or frame. The head is moved at high speed.

When cooling water or air is supplied to the cooling passage formed in the moving object, the moving object is cooled to prevent the temperature of the moving object from rising and indirectly suppress the heat generation of the coil portion.

Thus, thermal expansion of the moving object due to heat generated by the coil portion is prevented.

According to a second aspect of the present invention, there is provided a laser processing machine provided on a fixed object for moving a moving object such as a processing table or a laser processing head with respect to a fixed object such as a bed or a frame in the laser processing machine. A linear motor consisting of a magnet part provided on the moving object and a coil part provided on the moving object, an air injection port provided below the moving object at both ends of the coil part, and an outlet part of the air injection port jetting to the coil part. And a second outlet portion in the direction of jetting to the magnet portion.

Therefore, as in the first aspect, the coil portion provided on the moving object is excited with respect to the magnet portion provided on the fixed object of the linear motor, thereby moving the fixed object relative to the bed or frame. An object processing table or a laser processing head is moved at a high speed.

When dry air is injected from an air injection port provided at a lower portion of a moving object at both ends of the coil portion, the coil portion is cooled by the dry air injection from the first outlet portion, and a temperature rise due to heat generation of the coil portion is prevented. Can come off. Further, dust and the like accumulated on the magnet portion by the ejection of the dry air from the second outlet portion are blown off. Thus, a decrease in the thrust of the linear motor is prevented.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 3, the laser processing machine 1 includes a bed 3 extending in the X-axis direction and having an open upper central portion. The bed 3 has a processing table 5 on which a work W is placed. It is provided movably in the axial direction (the front-back direction in FIG. 3).

At substantially the center of the bed 3 in the X-axis direction, a portal frame 7 is provided upright over the bed 3. A Y-axis carriage 11 is provided on the front surface of the upper frame 9 of the portal frame 7, and the Y-axis carriage 11 is provided movably in the Y-axis direction (left and right direction in FIG. 3). The Y-axis carriage 11 is provided with a laser processing head 13 that is movable in the Z-axis direction (vertical direction in FIG. 3).

With the above arrangement, the laser beam is moved from the laser processing head 13 to a desired position on the work W by moving the processing table 5 on which the work W is placed in the X-axis direction and moving the laser processing head 13 in the Y-axis direction. Laser processing is performed by irradiating the beam.

The processing table 5 is moved at a high speed in the X-axis direction with respect to the bed 3. More specifically, linear motors 15 are provided above and below both ends of the processing table 5, respectively.
Is provided. As each linear motor 15,
A coil portion 15A is provided on the upper and lower surfaces of the processing table 5 so as to extend in the X-axis direction, and a magnet portion 15B is provided on the upper and lower surfaces of the bed 3 so as to extend in the X-axis direction.

With the above configuration, the four linear motors 15
When the coil portion 15A is excited, it is driven synchronously, the thrust is simply quadrupled, and it can be moved at a higher speed than in the past. In addition, since the linear motors 15 are provided on the upper and lower sides, the suction force is offset, the heat generated by friction is less likely to occur, and the suction force can be easily balanced.

Although the processing table 5 has been described,
To move the laser processing head 13 in the Y-axis direction,
The same linear motors 15 as described above may be provided above and below both ends of the shaft carriage 11 and the upper frame 9, respectively.

As shown in FIG. 1, the bed 3
Above, the magnet part (magnet plate) 15B of the linear motor 15 is X
Along with being mounted to extend in the axial direction, a coil portion 15 </ b> A is provided below the processing table 5. An inlet 17 for supplying cooling water or air is provided at the upper left portion of the processing table 5 in FIG. 1, and a discharge port 19 is provided at an upper right portion of the processing table 5 in FIG. A cooling passage 21 communicating with the inlet 17 and the outlet 19 is formed in the processing table 5.

With the above configuration, when cooling water or air is supplied from the inlet 17 to the cooling passage 21, the cooling water or air passes through the cooling passage 21 and is discharged from the outlet 19.
Therefore, since the processing table 5 is cooled by the cooling water or the air, the temperature rise of the processing table 5 can be prevented, and the heat generation of the coil portion 15A can be suppressed indirectly. Thus, thermal expansion of the processing table 5 due to heat generation of the coil portion 15A can be prevented.

The moving object may be a Y-axis carriage 11 provided with a laser processing head 13 instead of the processing table 5.

FIGS. 2A and 2B show another example of the embodiment instead of FIG. In FIG. 2A, air injection ports 23 are provided on both sides of the processing table 5. As shown in FIG. 2B, the outlet portion 23A of each of the injection ports 23 has a first outlet portion 25 in the direction of jetting to the coil portion 15A and a second outlet portion in the direction of jetting to the magnet portion 15B. Section 27.

With the above configuration, dry air is supplied from the processing table 5 and directed from the first outlet 25 and the second outlet 27 provided at the outlet 23A of the air injection port 23 to the coil 15A and the magnet 15B, respectively. As a result, the dry air is injected to prevent the temperature from rising due to the heat generated by the coil portion 15A and to blow off the dust and the like deposited on the magnet portion 15B. Thus, a decrease in the thrust of the linear motor 15 can be prevented. In the example of this embodiment, the present invention is also applicable to a case where a Y-axis carriage 11 having a laser processing head 13 is used instead of the processing table 5 as a moving object.

The present invention is not limited to the above-described embodiment, but can be embodied in other modes by making appropriate changes. In the example of the present embodiment, a laser processing machine that moves the processing table 5 in the X-axis direction and the laser processing head 13 in the Y-axis direction has been described, but the laser processing head 13 moves in the X-axis and Y-axis directions. It may be a processing machine.

[0029]

As will be understood from the above embodiments, according to the first aspect of the present invention, the coil provided on the moving object relative to the magnet provided on the fixed object of the linear motor. By exciting the portion, the processing table or laser processing head of the moving object can be moved at a high speed with respect to the bed or the frame of the fixed object.

When cooling water or air is supplied to a cooling passage formed in the moving object, the moving object is cooled to prevent the temperature of the moving object from rising and to indirectly suppress the heat generation of the coil portion. it can.

Thus, the thermal expansion of the moving object due to the heat generated by the coil portion can be prevented.

According to the second aspect of the present invention, similarly to the first aspect, the coil portion provided on the moving object is excited with respect to the magnet portion provided on the fixed object of the linear motor, thereby forming the fixed object. The processing table or the laser processing head of the moving object can be moved at a high speed with respect to the bed or the frame.

When dry air is injected from an air injection port provided below a moving object at both ends of the coil portion, the coil portion is cooled by the dry air injection from the first outlet portion, thereby preventing a temperature rise due to heat generation of the coil portion. can do. Further, dust or the like deposited on the magnet portion by the dry air injection from the second outlet portion can be blown off. Thus,
A reduction in the thrust of the linear motor can be prevented.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a main part of the present invention, in which a linear motor is provided on a bed and a processing table.

2A is a front view of another example in which a linear motor is provided on a bed and a processing table, and FIG. 2B is a front view of FIG.
It is an enlarged view of the arrow view part.

FIG. 3 is a perspective view of a laser processing machine according to an embodiment of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laser processing machine 3 Bed 5 Processing table 9 Upper frame 11 Y-axis carriage 13 Laser processing head 15 Linear motor 15A Coil part 15B Magnet part 17 Intake 19 Outlet 21 Cooling passage 23 Air injection port 23A Exit part 27 First exit 29 2nd exit

Claims (2)

[Claims] 1. A magnet provided on a fixed object and a magnet provided on the moving object to move a moving object such as a processing table or a laser processing head with respect to a fixed object such as a bed or a frame in a laser beam machine. A linear motor including a coil portion is provided, and cooling water or air is supplied to a cooling passage formed in the moving object so as to suppress heat generation of the coil portion in the linear motor and prevent a temperature rise of the moving object. A laser processing machine characterized in that: 2. A magnet provided on a fixed object and a magnet provided on the moving object for moving a moving object such as a processing table or a laser processing head with respect to a fixed object such as a bed or a frame in a laser beam machine. A linear motor comprising a coil portion; an air injection port provided below a moving object at both ends of the coil portion; an exit portion of the air injection port having a first exit portion in a direction of injecting the coil portion; And a second outlet part in a direction of jetting to the part.