JP2000334593A - Working table of laser beam machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve working efficiency by surely fixing works of various scales. SOLUTION: Interior of a working table 20 is divided into mutually independent sections 22a-22c by L-shaped partition walls 21a and 21b. Then, on each of the sections, vacuum pressure sensors 10a-10b are arranged, and at the same time sections 22b and 22c are connected to a vacuum pressure supplying source 11 through electromagnetic valves 24b and 24c respectively. After a prescribed duration of time from the start of fixing of a work 25, output values of the vacuum pressure sensors 10a-10c are confirmed; in the case that pressures of the sections 22b and 22c are higher than the prescribed values, the electromagnetic valves 24b and 24c connected to the respective sections are operated to cut off connections between the sections and the vacuum pressure supplying source 11. In the case that the pressures of all the sections are higher than the prescribed values, an alarm is displayed and no working is started.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing table of a laser processing machine for sucking and fixing a work by utilizing a negative pressure.

[0002]

2. Description of the Related Art FIG. 5 is a plan view of a processing table of a conventional laser beam machine, and FIG. 6 is a sectional view taken along line AA of FIG. The processing table 1 is formed in a box shape by an upper plate 2, a lower plate 3, and a side plate 4, and a space 5 is formed therein. And
The processing table 1 is placed on an XY table 6 and is movable in XY directions. A plurality of suction holes 7 connecting the space 5 and the atmosphere are arranged on the upper plate 2 at a uniform density over the entire surface. Joints 8 a to 8 d connecting the space 5 and the pipe 9 are arranged on the side plate 4. Pressure sensor 1 on pipe 9
0a and 10b are arranged and connected to a vacuum pressure source 11 such as a vacuum pump or an ejector. Output signal lines 12a and 12b of the pressure sensors 10a and 10b are connected to a control device 13.

Next, the operation of a conventional laser beam machine will be described. A work (not shown) having substantially the same vertical and horizontal dimensions as the surface of the upper plate 2 (hereinafter referred to as the mounting surface S) is placed on the mounting surface S,
The vacuum pressure supply source 11 is operated. Since the suction holes 7 are closed by the work, the space 5 has a negative pressure. As a result, the work is sucked and fixed to the mounting surface S. The controller 13 refers to the output signals from the pressure sensors 10a and 10b, and starts drilling when the inside of the pipe 9, that is, the space 5 is reduced to a predetermined pressure (when the work is completely fixed). ing.

[0004]

However, in the case of a work having a small external shape, the suction hole 7 not closed by the work remains in communication with the outside, and a part of the space 5 is opened. When a part of the space 5 is in an open state, the work force is insufficiently fixed due to a decrease in the attraction force, and processing failure occurs. Therefore, when processing a small work, the worker manually closes the suction hole 7 that is not closed by the work with a tape or the like. For this reason, the processing efficiency decreased.

An object of the present invention is to solve the above-mentioned problems in the prior art, and to provide a processing table of a laser processing machine capable of securely fixing a work even if the size of the work changes and improving work efficiency. Is to do.

[0006]

Means for Solving the Problems To achieve the above object, the invention of claim 1 comprises a table body having a decompression space formed therein, and decompression means capable of decompressing the decompression space. A laser processing machine, wherein a work mounting portion on which a work can be mounted is formed on the table main body, and a plurality of work suction holes for communicating the decompression space and the outside of the table main body are formed on the work mounting portion. In the working table, a partition member is provided in the table body, the decompression space is partitioned into a plurality of sections by the partition member, and the decompression means is connected to each of the plurality of sections, and each of the sections is independently decompressed. To be characterized.

According to a second aspect of the present invention, an air pressure detecting means for detecting an air pressure in each of the sections is provided for each of the sections, and the decompression means is independently connected to each of the plurality of sections. Pressure transmitting means, and a pressure reducing device connected to the pressure transmitting means, wherein each of the pressure transmitting means is provided with an opening / closing means capable of opening and closing the inside of the pressure transmitting means, and each of the pressure detecting means An air pressure comparing section for comparing the air pressure of each section with a predetermined air pressure based on the detection result from the controller; and an opening / closing means drive control section for driving each of the opening / closing means based on the comparison result of the air pressure comparing section. It is characterized by the following.

According to a third aspect of the present invention, the plurality of sections are formed along a plurality of substantially similar rectangular contours arranged so as to share one corner. .

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing an example of a processing table of a laser processing machine according to the present invention, and FIG.
It is -B sectional drawing. 5 and 6 described in "Prior Art" will be assigned the same reference numerals and description thereof will be omitted. The processing table 20 is formed in a box shape by the upper plate 2, the bottom plate 3, and the side plate 4, and a space 5 surrounded by the plates 2, 3, and 4 has an L-shape connecting the upper plate 2 and the bottom plate 3 (see FIG. 1) partition walls 21a, 21b, a plurality of (three in the figure) sections 22a, 2a
2b and 22c. Processing table 20 is X
It is placed on the Y table 6 and is movable in the XY directions.

[0010] The plane shape of the section 22a is
It is a rectangle C having a shape substantially similar to the upper plate 2 having the corner P of 0 as a vertex, and a plane shape obtained by combining a section 22a of the rectangle C and a section 22b having an L-shaped plane shape is substantially similar to the rectangle C. Is a rectangle D. Section 22a is joint 8a, pipe 23a
Is connected to the vacuum pressure supply source 11 via the. The section 22b is connected to the vacuum pressure supply source 11 via a joint 8b, a pipe 23b, and a normally closed solenoid valve 24b. Further, the section 22c is connected to the vacuum pressure supply source 11 via a joint 8c, a pipe 23c, and a normally closed solenoid valve 24c. A pressure sensor 10 is connected to the pipes 23a, 23b and 23c.
a, 10b and 10c are arranged respectively. Output signal lines 12a, 12 of pressure sensors 10a, 10b, 10c
b and 12c are connected to the control device 25.

Next, the operation of this embodiment will be described. FIG. 3 is a flowchart showing the operation of the present embodiment. When a start button (not shown) is turned on, the control device 25 turns on the vacuum pressure supply source 11 (step S1).
00), the solenoid valves 24b and 24c are turned on (opened), and a timer (not shown) is turned on (step S11).
0). When the solenoid valves 24b and 24c are turned on, the section 22
b and 22c are connected to the vacuum pressure supply source 11. And
It waits for the time t from when the solenoid valves 24b and 24c are turned on to elapse by a preset time T (step S12).
0). When the timer notifies that the time T has elapsed,
The control device 25 performs the following processing based on the outputs Pa, Pb, and Pc (atmospheric pressure) from the sensors 10a, 10b, and 10c. That is, it is determined whether the output Pc of the sensor 10c is equal to or lower than the preset pressure Pk (step S13).
0), if the output Pc of the sensor 10c, that is, the internal pressure Pc of the section 22c is equal to or less than the preset pressure Pk, the process of step S150 is performed. If the internal pressure Pc is greater than the preset pressure Pk, After the electromagnetic valve 24c is turned off (closed) (step S140), the process of step S150 is performed. In step S150, the output P of the sensor 10b
It is determined whether or not b is equal to or less than a preset pressure Pk. If the output of the sensor 10b, that is, the internal pressure Pb of the section 22b is equal to or less than the preset pressure Pk, the process of step S170 is performed. If Pb is larger than the preset pressure Pk, the electromagnetic valve 24b is turned off (step S160), and the process of step S170 is performed.
In step S170, it is determined whether the output Pa of the sensor 10a is equal to or lower than a preset pressure Pk, and the output Pa of the sensor 10a, that is, the internal pressure Pa of the section 22a is determined.
Is larger than the preset pressure Pk, an alarm is displayed (step S180) and processing is not started. If the internal pressure Pa is equal to or lower than the preset pressure Pk, the processing is started (step S190).

For example, a work 2 having a shape substantially equal to a rectangle D
5 will be described. The work 25 is set at the corner P as shown in FIG. This is the same when a work of another shape (a rectangle C or a shape equal to the entire upper plate 2) is installed. Therefore, when the work 25 is installed, the sections 22a and 22b are closed from the atmosphere by the work 25, and the section 22c communicates with the atmosphere. As a result, the internal pressure Pc of the section 22c becomes higher than the pressure Pk,
Since c is turned off and the internal pressure Pb of the section 22b is lower than the pressure Pk, the boring is started while the solenoid valve 24b is kept on. As described above, the section 22c that is in communication with the atmosphere is not in communication with the other sections 22a and 22b, and only the sections 22a and 22b are in communication with the vacuum pressure source 11, so that the work 25 is effectively sucked. Will be

When the internal pressure Pa of the section 22a is higher than the preset pressure Pk, the state where the work is not properly set to the corner P (or the state where the work is not set at all, Alternatively, since a work that does not match the processing table 20 is installed), an alarm is displayed and processing is not started. Thereby, processing errors and the like are prevented.

In the above description, the processing table 20 is attached to the bottom plate 4
In the case where the surface of the XY table 6 is sufficiently flat, as shown in FIG.
a, a sealing member 30 is disposed on the bottom surface of the XY table 6 by means not shown.
May be pressed against the surface.

As described above, according to the processing table 20,
Since the vacuum suction range can be automatically set in accordance with the size of the work, even when the size of the work is small, it is not necessary to close the suction hole by hand as in the related art, thereby improving work efficiency. Also, the vacuum pressure supply source does not consume wasteful energy, can save energy, and is economical.

[0016]

As described above, according to the present invention,
By independently depressurizing only the section corresponding to the work placement position, even if the size of the work changes, the work can be surely fixed by suction and the work efficiency can be improved.

Further, the air pressure of each section is compared by an air pressure comparing section, and if the air pressure is higher than a predetermined pressure, that is, if no work is placed on the section, the air pressure corresponding to the section is determined. Since the opening / closing means is driven to stop the decompression of the section, it is convenient that unnecessary energy is not consumed.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a processing table of a laser processing machine according to the present invention.

FIG. 2 is a sectional view taken along line BB of FIG.

FIG. 3 is a flowchart showing the operation of the present embodiment.

FIG. 4 is a modified example of a processing table of the laser processing machine according to the present invention.

FIG. 5 is a plan view of a processing table of a conventional laser processing machine.

6 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 2 Top plate 3 Bottom plate 4 Side plate 10a, 10b, 10c Vacuum pressure sensor 11 Vacuum pressure supply source 20 Processing table 21a, 21b Partition wall 22a, 22b, 22c Section 24b, 24c Solenoid valve 25 Work

Claims (3)

[Claims] 1. A table body having a decompression space formed therein, and a decompression means capable of decompressing the decompression space, wherein a work mounting portion on which a work can be mounted is formed on the table main body. A plurality of work suction holes communicating with the decompression space and the outside of the table body are formed in the work mounting portion;
In the processing table of the laser beam machine, a partition member is provided in the table main body, the decompression space is partitioned into a plurality of sections by the partition member, and the decompression means is connected to each of the plurality of sections, and these sections are independently formed. A processing table for a laser processing machine. 2. An air pressure detecting means for detecting an air pressure in each of the sections is provided for each of the sections, the pressure reducing means being a pressure transmitting means independently connected to each of the plurality of sections, A pressure reducing device connected to these pressure transmitting means, and each of the pressure transmitting means is provided with an opening / closing means capable of opening and closing the inside of the pressure transmitting means, based on a detection result from each of the atmospheric pressure detecting means, An air pressure comparison unit that compares the air pressure of each section with a predetermined air pressure is provided, and an opening / closing unit drive control unit that drives each of the opening / closing units based on a comparison result of the air pressure comparison unit is provided. The processing table of the laser processing machine according to claim 1. 3. The laser according to claim 1, wherein the plurality of sections are formed along a plurality of substantially similar rectangular contours arranged so as to share one corner. Processing table of processing machine.