JP3975236B2 - Strip material holder processing equipment - Google Patents

Description

  The present invention relates to a processing apparatus for a band material holding table, and more particularly, in a die-cut formed by implanting a band material (blade material, ruled material, perforation forming material, etc.) into the band material holding table. The present invention relates to a method for forming a slit for implanting a strip with high accuracy by a laser beam.

  Conventionally, paper containers, cardboard boxes, resin film boxes, and the like are manufactured by punching using a die having an unfolded shape such as a paper container, and the punching is performed on a belt holding table. A slit having a shape is formed by laser processing in advance, and is formed by implanting a band material such as a blade material or a ruled material bent into the slit.

In order to improve the quality of products such as the above paper containers, the dimensional accuracy of the cutting die is very important. In other words, whether or not the dimensions of the slits of the band material holding base for implanting the band material are processed with high accuracy. It becomes a point.
As shown in FIG. 8, the slit processing is performed by irradiating the strip material holder 1 made of plywood with the focal point F of the laser beam L shifted upward in the Z direction. By moving 1 in the XY direction in the horizontal direction according to a preset route, a slit 1a having a certain width is formed in a predetermined shape.

That is, by shifting the focal point F of the laser beam L slightly upward from the strip material holder 1, the slit 1a can be wide enough to implant the strip material. Since the laser beam L that is included is penetrated by the thickness of the strip material holder 1, the energy received from the laser beam L is different between the front surface and the back surface of the strip material holder 1.
On the front surface side of the strip material holder 1, the width d1 of the slit 1a can be kept at a predetermined value by adjusting the focal point F distance, but on the back surface side, the strip material holder 1 is moved in the XY direction. If it is not made, it will have an expansion at the converging angle, and the slit width on the back side will become large like d2 ′. Therefore, the width d2 on the back surface side of the slit 1a can be reduced by moving the band material holder 1 in the XY direction before the width on the back surface side of the slit 1a becomes large. It is adjusted to be the same.

However, the strip material holder 1 made of plywood has a different moisture content, and the thermal energy transmitted from the laser beam to the strip material holder 1 differs depending on the moisture content, that is, at a location where the moisture content is large. While the thermal energy transmitted to the blade holder 1 itself is small, the thermal energy transmitted to the blade holder 1 itself is large at a location where the moisture content is small. Even when moved in the XY direction at the processing speed, a phenomenon occurs in which the width d2 on the back surface side of the slit 1a varies.
If the widths d1 and d2 of the processed slits 1a of the band material holder 1 do not match the thickness of the band material to be planted, the band holding force is reduced and a short band material is formed during the punching process. Problems such as dropping off or the strip not being perpendicular to the strip holder 1 occur.

  Therefore, Japanese Patent No. 2528587 discloses a laser processing apparatus 1 shown in FIG. Specifically, the laser processing apparatus 1 includes a laser generation apparatus 2, a control apparatus 3 that controls the laser generation apparatus 2, and a weight measurement that measures the weight of the band material holder 7 that is connected to the control apparatus 3 and that is a workpiece. A needle-like member 6 erected on the upper surface of the weight measuring instrument 5 to directly support the container 5 and the band material holding table 7, and supports the weight measuring instrument 5 and is movable in the horizontal XY directions. Table 4 is provided.

  According to the laser processing apparatus 1 shown in FIG. 9, the moisture content is calculated from the weight of the strip material holder 7 measured by the weight measuring device 5, and the control data such as the machining speed is corrected according to the moisture content. In addition, since the laser processing is performed by automatically setting the control data suitable for the current moisture content, it is possible to perform accurate slitting reflecting the individual moisture content of the band material holder 7.

However, in the laser processing apparatus 1 disclosed in the above publication, since the moisture content is calculated by measuring the weight of the entire band material holder 7, only the average moisture content of the entire band material holder 7 can be calculated. Can not. If the moisture contained in the strip material holder 7 is evenly distributed over the entire plate, there is no problem, but if the moisture distribution is not uniform, the slit width may vary. .
Japanese Patent No. 2528587

  This invention is made | formed in view of the said problem, and makes it a subject to enable the exact slit process which reflected the local moisture content of the laser irradiation position of a strip | belt material holding stand.

In order to solve the above problems, the present invention provides a processing apparatus for forming a slit for implanting a strip material by irradiating a laser beam onto a strip material holder of a water-containing material.
A laser processing mechanism for irradiating the laser beam toward the band material holder;
A moving means for relatively displacing the laser beam and the belt material holder;
Sound collecting means for acquiring a water vapor explosion sound generated at the start of irradiation of the laser light according to the moisture content of the strip material holder ,
It is connected to the moving means and the sound collecting means, and the optimum processing conditions corresponding to the value of the steam explosion sound are stored for the processing conditions including the relative moving speed between the band material holder and the laser beam. A computer having a database,
The computer sets the processing conditions including the relative movement speed between the band material holder and the laser beam as the optimum processing conditions acquired from the database based on the value of the steam explosion sound collected by the sound collecting means. An apparatus for processing a strip support is provided, characterized in that a calculation control means for calculation correction is provided.

As a result of diligent research, the present inventor has found that the processing sound when laser light is irradiated differs depending on the amount of water (cell water) contained in the band material holder. That is, by irradiating the moisture contained in the band material holder with laser light, a microscopic steam explosion occurs in the cell, and by examining the value of the processing sound including the steam explosion sound, It becomes possible to take into account the local moisture content.
Therefore, with the above-described configuration, the processing sound at the time of laser processing acquired by the sound collecting means is taken into a computer, and an optimum processing condition according to the processing sound is acquired by collating with a database prepared in advance to obtain a laser. By automatically calculating and correcting the light movement speed etc. to the optimum value, it is possible to set the processing conditions according to the local moisture content, and the slit processing of the strip holder with non-uniform moisture content is also accurate dimensional accuracy Can be performed.
The water-containing material band holder is formed of a single plate or laminate made of wood, a foamed resin plate, an accumulation material of different materials, and the like. Further, the processing sound includes sound accompanying the processing work.

  It is preferable that the processing sound collated with the database is a processing sound including a steam explosion sound generated at the start of irradiation of the laser light in accordance with the moisture content of the band material holder.

At the start of processing immediately after the laser beam irradiation, the band material holder is cut using the entire diameter of the laser beam, but then the laser beam and the band material holder are moved relative to each other continuously. Then, when the slit processing is advanced, the laser beam cuts the virgin portion (uncut portion) of the band material holder, not the entire diameter, but only a part in the radial direction, and the other light beam shows the cut trace where the slit has already been formed. It will only pass. Although it is possible to determine the optimum machining condition in consideration of the area of the virgin portion for the processing sound acquired by the sound collecting means, the area of the virgin portion to which the laser beam hits will be different if the processing speed is different. Therefore, it is necessary to additionally consider the processing speed as a reference item of the database.
However, with the above configuration, since the processing sound at the start of processing when laser beam irradiation is started on the band material holder is referred to, the processing area becomes the entire diameter of the laser light and the conditions are constant. Can be improved and the database can be simplified.
In addition, based on the same principle, the processing sound by laser beam spot irradiation may be used for collation with a database.

The band material holding base constituting the punch for soft material punching is one in which the band material made of metal is implanted in the slit,
It is preferable that the relative movement speed between the strip material holder and the laser beam is constant or variable over the entire length of the slit, which is one processing section. Examples of the soft material include paper materials, resin film materials, and fiber materials.

The present invention is a processing apparatus for forming a slit for implanting a strip material by irradiating a strip material holder of a water-containing material with a laser beam,
A laser processing mechanism for irradiating the laser beam toward the band material holder;
A moving means for relatively displacing the laser beam and the belt material holder;
Reverberation detecting means for acquiring a reverberant sound of a sound wave directed to the band material holder or a reverberant sound at the time of impact by a physical impact means;
A database that is connected to the moving means and the echo detection means, and that stores optimum conditions according to the value of the echo sound for processing conditions including a relative moving speed between the band material holder and the laser beam. And a computer having
The computer calculates and corrects the processing conditions including the relative movement speed between the band material holder and the laser beam to the optimum processing conditions acquired from the database based on the value of the reverberation sound acquired by the reverberation detecting means. There is provided a processing apparatus for a band material holding table, characterized in that an arithmetic control means is provided.

  With the above configuration, the reverberation sound data acquired by the reverberation detecting means is collated with the database, so that the processing conditions such as the processing speed of the band material holder with respect to the laser light can be set to an optimum value. Slit processing can be performed with accurate dimensional accuracy by processing conditions corresponding to the moisture content of the material holding table.

  As is clear from the above description, according to the present invention, the processing sound at the time of laser processing is taken into the computer from the sound collecting means, the optimum processing condition according to the processing sound is obtained by referring to the database, and By automatically calculating and correcting the relative movement speed between the material holder and the laser beam to the optimum value, processing that reflects the local moisture content of the band material holder becomes possible, and the moisture content is uneven. Can be accurately slit.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a block diagram of a processing apparatus 10 for a belt holding table according to the first embodiment.
The processing apparatus 10 includes a laser processing mechanism 11 that irradiates a laser beam L toward a strip holding base 19 made of a wooden flat plate that is a processing target, and a lens 15 of the laser processing mechanism 11 in a vertical direction (in the Z direction). ) The Z table 24 to be moved, the XY table (moving means) 20 for moving the band material holding table 19 in the horizontal direction (XY direction), and the band material holding table 19 erected on the upper surface of the XY table 20 Needle-like support material 20 that directly supports, NC controller 23 that drives and controls XY table 21 via AC servo 22, sound collecting means 30 that is a microphone arranged and fixed in the vicinity of band material holding table 19, A computer 25 connected to the sound means 30 and the NC controller 23 and having a database 27 is provided.

The laser processing mechanism 11 includes a laser oscillator 12 that generates a CO ₂ laser, a laser passage portion 13 that allows the laser beam L from the laser oscillator 12 to pass, and a bend mirror 14 that bends the laser beam L from the horizontal direction to the vertical direction. A condensing lens 15 for condensing the laser light L, a control unit 16 for controlling the laser oscillator 12 and a control device 18 having an operation control panel 17, and the laser light from the lower end opening 13 a of the laser passage unit 13. L is condensed and irradiated at a predetermined angle.

  The computer 25 includes calculation control means 26 for performing various calculations and temporary storage, input means 28 that is an interface connected to the sound collection means 30, output means 29 that is an interface connected to the NC controller 23, machining sound, And a database 27 that stores the relationship with the optimum machining conditions.

  The database 27 is an experiment of optimum conditions corresponding to each value of the machining sound with respect to the machining conditions such as the moving speed in the horizontal direction (XY direction) of the strip material holder 19 with respect to the laser light L, the focal length, and the power density. Saving data. The processing sound value used in the database 27 is the processing sound at the start of processing, which is immediately after the irradiation of the laser beam L to the band material holder 19 is started.

  The sound collecting means 30 is fixed to the housing of the laser processing mechanism 11 via an arm (not shown) so that a constant distance of about 20 to 50 mm is maintained from the processing position where the laser beam L is applied to the band material holder 19. Has been. Further, the processing sound acquired by the sound collecting means 30 includes noise sound in addition to the steam explosion sound in which the cellular water contained in the band material holder 19 is rapidly evaporated by the laser light L, so that the unnecessary sound range is masked. Thus, it is preferable to use only steam explosion sound as a target. A signal amplifier may be provided between the sound collecting means 30 and the computer 25.

Next, the slit processing of the strip material holder 19 using the processing apparatus 10 having the above-described configuration will be described.
As shown in FIG. 2, the focus F of the laser light L is positioned slightly above the strip material holder 19 to irradiate the strip material holder 19 with the laser beam L spreading at a predetermined angle to form a slit 19 a. .
When the laser beam L cuts the strip material holder 19, the laser beam L strikes the cellular water W contained in the strip material holder 19, thereby causing a steam explosion in a micro cell accompanied by a steam explosion sound. Therefore, the processing sound including the steam explosion sound is acquired by the sound collecting means 30 and transmitted to the computer 25 as an electric signal.

  Here, in the middle of continuously slitting the band material holder 19 by moving the XY table 21 with respect to the laser light L, the laser light L has a full diameter as shown in FIG. Instead, only a part in the radial direction cuts the virgin portion V, which is an uncut portion of the band material holding base 19, and the other rays only pass through the cutting trace where the slit 19a has already been formed, and the processing area is the processing speed. Will depend on. Therefore, in the present embodiment, the entire diameter of the laser light L is used for cutting by using only the processing sound of the processing start portion S immediately after the start of irradiation of the band material holder 19 as a comparison target with the database 27. The processing sound can be considered under processing conditions with a constant processing area. In addition, the machining start portion S that is cut at all diameters has the advantage that the machining noise is the largest and therefore it is easy to collect sound.

When slit processing is performed on the strip material holder 19, usually, as shown in FIG. 3 (B), a plurality of bridges B into which notches (not shown) of the strip material 31 are intermittently provided are provided. The cutting portion is prevented from falling off, and a plurality of processing start portions S are generated in the laser processing operation of one band material holder 19.
Further, it goes without saying that the database storing the relationship between the processing sound and the processing speed is constructed based on experimental data acquired for the processing sound at the start immediately after the laser light irradiation.

  Then, the optimum machining speed (feed speed of the XY table 21) corresponding to the machining sound value obtained for each bridge B is obtained from the database 27, and the machining speed of the program in the NC controller 23 is automatically set to the optimum value. Machining while correcting the calculation. If necessary, the computer 25 and the control device 18 can be connected to automatically correct the focal length and power density in the same manner.

With the above configuration, even when the moisture content of the strip material holding table 19 is locally different and non-uniform, the processing speed is corrected according to the moisture content of the machining location. Processing can be performed with accurate dimensions so that the width d1 on the front surface side and the width d2 on the back surface side are the same.
Finally, the strip 31 (blade or ruled material) is implanted in the slit 19a in which the strip holder 19 is formed, and a thin iron plate 32, a paper sheet 33 and a back plate 34 are provided on the back side and punched out. A high-accuracy die is formed by mounting on a press (not shown). That is, since the slit 19a is formed with an accurate dimension, an appropriate clamping force can be exerted on the band material 31, and the band material 31 can be prevented from falling off during the punching process. It can be planted correctly and vertically with respect to the strip material holder 19.

Further, as a modification of the above embodiment, even in continuous machining from the machining start portion S to the next bridge B, machining sound is continuously acquired from the sound collecting means 30, and the computer 25 performs arithmetic control. It is preferable to continuously perform automatic calculation correction to the optimum value of the moving speed of the XY table 21 by means 26 and feed back to the NC controller 23 in real time.
With the above configuration, even during continuous processing in one processing section between the bridges B, adjustment can be performed by changing the processing speed flexibly according to the change in moisture content.

5 and 6 show a second embodiment.
The difference from the first embodiment is that the echo detection means 43 is provided to determine the moisture content of the band material holder 19.

As shown in FIGS. 5 and 6, the echo detection unit 43 includes a sound generation unit 45 that generates a sound wave 46, a sound collection unit (high-performance microphone) 44 that acquires an echo sound 47 reflected by the band material holder 19, and And is connected to the input / output means 42 of the computer 48.
In addition, the computer 48 includes a database 41 that stores experimental data relating to the relationship between the value of the reverberation sound 47 and the moisture content of the band material holder 19.
Since other configurations are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

  The operation procedure of the processing apparatus 40 is as follows. First, during the trial operation, the XY table 21 is moved, and the echo detection means 43 acquires the echo sound 47 in advance along the path of the slit to be formed on the band material holder 19. This is performed and collated with the database 41 based on the reverberation sound data, thereby calculating the local moisture content of each part of the band material holder 19 irradiated with the laser light L in the next process. Then, the optimum processing speed condition based on the calculated moisture content is transmitted to the NC controller 23.

With the above configuration, even when the moisture content of the strip material holder 19 is locally different and non-uniform, the XY table 21 is sent at a processing speed corresponding to the moisture content at each processing location, and the strip material holder 19 Can be machined with accurate dimensional accuracy.
Note that the acquisition of the reverberation sound 47 by the reverberation detection means 43 may be performed near the processing location simultaneously with the laser processing, thereby eliminating the need for a trial run. Further, when it is considered that the moisture content of the strip material holder 19 is substantially uniform, the average moisture content may be obtained by obtaining an echo sound for a part of the strip material holder 19.

FIG. 7 shows a third embodiment.
The difference from the second embodiment is that when the sounding means 45 strikes the surface of the band material holder 19 with the physical impact means 50 instead of irradiating the band material holder 19 with the sound wave to acquire the echo sound. Thus, the processing conditions such as the processing speed are calculated and corrected to the optimum conditions.
The physical impact means 50 includes a cylinder part 51 and a piston part 52 having a hammer part 52 a at the lower end, and is connected to a computer 48 via a signal line 53. That is, the piston 52 is moved up and down at a required timing, the hammer portion 52 a is lightly collided with the surface of the blade holder 19, and the reflected sound is collected by the sound collecting means 44. If the material of the hammer portion 52a is the same as the material of the blade holding base 19, there is an advantage that the natural frequencies of the materials coincide with each other and it is easy to obtain reverberation sound by resonance. Deformation due to collision loss of the holding base 19 or the hammer portion 52a) can also be prevented.
In this case, it is assumed that the database stores experimental data relating to the relationship between the value of the reverberant sound caused by the physical impact means and the moisture content of the band material holder 19. Other configurations are the same as those of the second embodiment, and thus description thereof is omitted.

It is a lineblock diagram showing the processing device of a 1st embodiment of the present invention. It is a principal part expanded sectional view which shows the process of a slit. (A) is a perspective view which shows irradiation of a laser beam, (B) is drawing which shows the bridge | bridging of a slit. It is sectional drawing which shows implantation of the strip | belt material to a strip | belt-material holding stand. It is a block diagram which shows the processing apparatus of 2nd Embodiment. It is a principal part enlarged view which shows the measurement principle of a moisture content. It is a principal part enlarged view which shows the measurement principle of the moisture content of 3rd Embodiment. It is drawing explaining formation of the slit to a strip | belt material holding stand. It is drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 40 Processing apparatus 11 Laser processing mechanism 12 Laser oscillator 13 Laser passage part 13a Aperture 14 Bend mirror 15 Condensing lens 18 Control apparatus 19 Band material holder 19a Slit 20 Needle-shaped support material 21 XY table (moving means)
22 AC servo 23 NC controller 24 Z table 25 Computer 26 Arithmetic control means 27, 41 Database 28 Input means 29 Output means 30 Sound collecting means 31 Strip material 32 Thin iron plate 33 Paper sheet 34 Back plate 43 Echo detection means 44 Sound collecting means 45 Sound generation means 46 Sound wave 47 Reverberation sound 50 Physical impact means L Laser light W Cell water

Claims (3)

In a processing apparatus for forming a slit for implanting a band material by irradiating a laser beam to a band material holding table of a hydrous material,
A laser processing mechanism for irradiating the laser beam toward the band material holder;
A moving means for relatively displacing the laser beam and the belt material holder;
Sound collecting means for acquiring a water vapor explosion sound generated at the start of irradiation of the laser light according to the moisture content of the strip material holder ,
It is connected to the moving means and the sound collecting means, and the optimum processing conditions corresponding to the value of the steam explosion sound are stored for the processing conditions including the relative moving speed between the band material holder and the laser beam. A computer having a database,
The computer sets the processing conditions including the relative movement speed between the band material holder and the laser beam as the optimum processing conditions acquired from the database based on the value of the steam explosion sound collected by the sound collecting means. An apparatus for processing a strip material holder, comprising arithmetic control means for arithmetic correction. The band holding base constituting the die for soft material punching is one in which the band made of metal is implanted in the slit,
The apparatus for processing a strip material holder according to claim 1, wherein a relative movement speed between the strip material holder and the laser beam is constant or variable over the entire length of the slit which is one processing section . In a processing apparatus for forming a slit for implanting a band material by irradiating a laser beam to a band material holding table of a hydrous material,
A laser processing mechanism for irradiating the laser beam toward the band material holder;
A moving means for relatively displacing the laser beam and the belt material holder;
Reverberation detecting means for acquiring a reverberant sound of a sound wave directed to the band material holder or a reverberant sound at the time of impact by a physical impact means;
A database that is connected to the moving means and the echo detection means, and that stores optimum conditions according to the value of the echo sound for processing conditions including the relative movement speed of the band material holder and the laser beam. And a computer having
The computer calculates and corrects the processing conditions including the relative movement speed between the band material holder and the laser beam to the optimum processing conditions acquired from the database based on the value of the reverberation sound acquired by the reverberation detecting means. An apparatus for processing a strip holding table, comprising an arithmetic control means .

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