JP2020151742A - Laser engraving device and laser engraving method - Google Patents

Abstract

To be able to mold an object to be molded with an engraved mark with high productivity, on a coil material that is supplied to a press machine that molds a portion of a can, when performing variable engraving for each object to be molded.SOLUTION: A laser engraving device, which performs laser engraving onto a coil material that is supplied to a press machine that molds a portion of a can, comprises a feed mechanism that feeds the coil material at set speed, a laser head that performs engraving on to each object to be molded by emitting a laser beam to the coil material to be fed at the set speed, and a data communication part that switches engraving data on the laser head. The data communication part collectively switches a plurality of engraving data that are engraved on a plurality of objects to be molded, and the laser head continuously engraves the plurality of engraving data on prescribed positions of the coil material.SELECTED DRAWING: Figure 3

Description

The present invention relates to a laser engraving device and a laser engraving method for laser engraving a coil material supplied to a press machine for forming a part of a can.

By adding information, patterns, etc. to a part of the can, it is possible to enhance the decorativeness, provide information on individual products, and advertise individual products. Among them, the opening tab of the can lid is a place that the person holding the can pays particular attention to when operating the opening, and in the case of the stayion tab type, it is separated from the can lid body even after opening. Since there is no such thing, by adding information, a pattern, or the like to a part of the product, it is possible to effectively enhance the decorativeness and effectively provide information on the individual product.

Laser engraving (laser marking) is used to add information and patterns to the can by irradiating the coating film on the surface of the can or the surface of the can with laser light. By adopting laser engraving, high-definition engraving can be performed in a relatively small space for the above-mentioned engraving on tabs. A device for laser engraving a coil material that forms a part of a can (laser engraving device) is supplied with a roll of a coil material in which a strip-shaped plate material is wound in a roll shape and a coil material drawn out from the roll. A laser head is provided between the press and the coil material, and the coil material supplied to the press is laser-engraved at a predetermined position before molding by the press (Patent Document 1 below). reference).

Special Table 2015-531684

Such a laser engraving device is required to have variable engraving that engraves different contents for each molding object. In order to perform variable marking, it is necessary to communicate the marking data for each molding target and switch the operation program of the laser head. At this time, it takes time to switch the engraving data, and the coil material depends on the total time of the time required for the laser head to actually engrave the content of one engraving data and the time required for switching the engraving data for each molding target. Will be limited in time per stroke of the press. This limitation has been an obstacle to molding a stamped object with high productivity.

An object of the present invention is to deal with such a problem. That is, the present invention makes it possible to mold a molded object with a stamp with high productivity when performing variable marking for each molding object on a coil material supplied to a press machine for molding a part of a can. Is the issue.

In order to solve such a problem, the present invention has the following configurations.
It is a device that laser engraves the coil material supplied to the press machine that forms a part of the can, and irradiates the coil material sent at the set speed with the laser beam and the feed mechanism that sends the coil material at the set speed. A laser head for engraving each molding object and a data communication unit for switching the engraving data of the laser head are provided, and the data communication unit prints a plurality of engraved data to be engraved on a plurality of molding objects. The laser head is a laser engraving device characterized in that a plurality of engraving data are continuously engraved at a predetermined position of a coil material by switching collectively.

This is a marking method in which laser engraving is performed on the coil material supplied to the press machine that forms a part of the can, and the laser head irradiates the coil material sent to the press machine at a set speed with laser light. It has a laser engraving step of engraving each molding object and a data communication step of switching the engraving data of the laser head. In the data communication process, a plurality of engraving data to be engraved on a plurality of molding objects are printed. A laser engraving method characterized in that, in the laser engraving step, a plurality of engraving data are continuously engraved at a position where a molding target is to be molded.

Since the laser engraving device of the present invention having such a feature can switch a plurality of engravings for each molding object at once, the time per press stroke can be increased even when variable engraving for each forming object is performed. It can be set in a short time to mold the engraved object with high productivity.

It is explanatory drawing which showed the schematic structure of the system which molds a can lid with a tab. It is explanatory drawing which showed the structure of the laser engraving apparatus. It is explanatory drawing explaining the switching method ((a) individual communication method and (b) summary communication method) of engraved data. It is explanatory drawing which showed an example of the laser engraving method. It is explanatory drawing which shows the movement of the marking position in FIG. It is explanatory drawing which showed the other example of the laser engraving method, and the explanatory drawing which shows the operation chart.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same reference numerals in different figures indicate parts having the same function, and duplicate description in each figure will be omitted as appropriate. In the following description, the tab of the can lid will be described as an example of the molding target, but the present invention is not limited to this, and the can lid itself, the can body, and the metal cap molded from the coil material are not limited to this. It is intended for some cans such as.

First, in FIG. 1, a schematic configuration of a system for molding a can lid with a tab will be described. In this example, a press machine (conversion press) 1 for forming tabs, processing lids, and joining lids and tabs is used. The coil material T on which the tab is formed is a strip-shaped plate material of an aluminum plate, is drawn out from a roll R wound in a roll shape, and is supplied to the press machine 1 at a set speed. In the press machine 1, the coil material was tab-formed, and the can lid panel P supplied by the conveyor 2 of another route was processed, and the formed tabs were combined with the processed can lid. The can lid product W in the state is sent out from the outlet of the press machine 1.

In the illustrated example, a press machine 1 that performs conversion pressing is illustrated, but the present invention is not limited to this, and the press machine 1 molds only tabs and molds a can lid with another press machine. And the tab (not separated from the coil material) formed by the press 1 may be combined.

The laser engraving device 10 for imprinting the tab is deployed on the coil material T drawn out from the roll R and supplied to the press machine 1. The laser engraving device 10 laser-engraves the coil material T before the tab is formed at a predetermined position corresponding to the stroke of the press machine 1.

As shown in FIG. 2, the laser engraving device 10 sends laser light to the feed mechanism 11 (feed roll 11A and tension roll 11B) that sends the coil material T at a set speed in the direction of the arrow and the coil material T that is sent at the set speed. A laser head 12 (first laser head L1, second laser head L2, and third laser head L3) that irradiates and engraves each tab to be molded, a control unit 13 that controls the laser head 12, and a laser head. It is provided with a data communication unit 14 for switching the engraved data for the twelve.

In the illustrated example, the laser engraving device 10 includes a base portion 10A, and a laser irradiation unit 15 equipped with a feed mechanism 11 or a laser head 12 is provided on the base portion 10A. Further, the control unit 13 and the data communication unit 14 are arranged on a control panel (not shown) arranged on the base unit 10A.

The laser engraving device 10 is equipped with a speed sensor 16 that measures the feed rate of the coil material T. As the speed sensor 16, a laser Doppler speedometer that irradiates the coil material T with laser light and measures the feed rate of the coil material T in a non-contact manner can be used. The output of the speed sensor 16 is transmitted to the control unit 13, and the feed amount (distance) is calculated from the measured feed speed. The control unit 13 controls the marking timing of the laser head 12 according to the output of the speed sensor 16 (feed amount of the coil material T) so that the marking is made at a predetermined position of the coil material T. ..

The laser head 12 performs marking for each tab by the marking data switched by the data communication unit 14, and in the illustrated example, there are a plurality of laser heads 12 (three laser heads L1, L2, L3). ) Is provided, and the data communication unit 14 individually switches the engraved data of each laser head 12.

Then, the data communication unit 14 of the laser engraving device 10 engraves the laser head 12 not by the individual communication method as shown in FIG. 3 (a) but by the collective communication method as shown in FIG. 3 (b). Switching data. In the case of the individual communication method shown in FIG. 3A, the communication time tc1 required for switching the marking data required for performing the next marking (for example, "stamp 2") and one marking are actually performed. Since it is necessary to take the time ts1 between the strokes of press molding longer than the time (tk1 + tw1) including the time tw1 required for the above (that is, tk1 + tw1 <ts1), there is a limit to shortening the time ts1 between the strokes. Unable to mold engraved tabs with high productivity.

On the other hand, when the summary communication method shown in FIG. 3B is adopted, the engraved data for a plurality of pieces (6 pieces in the illustrated example) can be switched in one communication time ct2, so that the engraved data can be switched once. The time (tk2 + tw2), which is the sum of the communication time ct2 and the time tw2 for continuously performing a plurality of markings (marking 1 to marking 6), may be within the time required for a plurality of strokes (strokes 1 to 6). Therefore, the time between strokes (ts2) can be set short. This makes it possible to form engraved tabs with high productivity.

The plurality of engraved data communicated by the summary communication method can include different engraved contents corresponding to each tab. At this time, when a plurality of marking contents include a complicated marking that requires a relatively long marking time, it is complicated by combining with the marking contents having a short marking time without lengthening the stroke time. It is possible to include various engraved contents.

FIG. 4 shows a laser engraving method in the case of forming a tab with engraving with high productivity using three laser heads 12 (L1, L2, L3). In this example, in the plurality of laser heads 12 (L1, L2, L3), the marking positions (F1, F2, F3) shared by the respective laser heads are sequentially divided along the feeding direction of the coil material T. .. In the illustrated example, the positions where a plurality of (6 pieces) are continuously engraved are regarded as one division, and the division (F1) in charge of the laser head L1 and the division (F2) in charge of the laser head L2. And the division (F3) in charge of the laser head L3 are sequentially arranged along the feed direction of the coil material T. That is, in the direction opposite to the feeding direction of the coil material T, the F2 division is set next to the F1 division, and the F3 division is set next to the F2 division.

With respect to the setting of the marking position on the coil material T, the plurality of laser heads 12 (L1, L2, L3) are arranged along the longitudinal direction of the coil material T, and each laser head L1, The marking areas E1, E2, and E3 of L2 and L3 are set in a state of being fixed along the longitudinal direction of the coil material T. The engraving area referred to here refers to an area where engraving is possible with one laser head.

Here, each of the laser heads L1, L2, and L3 is in charge of a plurality of (6 pieces) of engraving data collectively and at a predetermined position in its own engraving area (E1, E2, E3). When the division (F1, F2, F3) of the marking position to be performed comes, a plurality of (6) markings are continuously performed at a predetermined position in the division.

Explaining the operation of the laser head L1 individually, the coil material T is sent in the direction of the arrow shown in the figure, the marking area E1 is divided into F1, and immediately after a plurality of markings are continuously performed by the laser head L1, the markings are made. In the area E1, the division F2 in charge of the laser head L2 and the division F3 in charge of the laser head L3 are sequentially entered (the divisions F2 and F3 have already been stamped in the previous stage). The operation of the laser heads L2 and L3 is the same.

FIG. 5 shows the movement of the marking position in the example shown in FIG. The moving distance of the coil material T depends on the stroke of the press, and the moving distance of the coil material T in one stroke is set to S1 in the illustrated example. As shown in the figure, the number of strokes until one marking position division (F1) enters one marking area (E1) and all exits is 6 strokes, and this number of strokes and one marking position division (F1) The number of engraved data in the inside is set to be the same.

Then, for one laser head 12, while the division F1 of the marking position in charge of itself passes through the marking area E1 of its own laser head, a plurality of portions (six pieces) to be stamped in each division are used. The engraving data is engraved, and the engraving data is switched until the next engraving position division in charge of the engraving data enters the engraving area of the own laser head.

According to such a marking method, a plurality of laser heads are arranged along the feeding direction of the coil material, and the marking positions shared by each laser head on the coil material T are classified along the feeding direction of the coil material T. Even if the stroke time of the press is set short, the variable marking for each tab can be smoothly performed.

FIG. 6 shows another marking method in the case of forming a tab with a marking with high productivity using three laser heads 12 (L1, L2, L3). In this example, a plurality of laser heads 12 (L1, L2, L3) are arranged for each row of tabs formed on the coil material T, and each laser head is assigned to each row of tabs formed. The marking position to be marked is divided. Specifically, the marking area E1 of the laser head L1, the marking area E2 of the laser head L2, and the marking area E3 of the laser head L3 are arranged in parallel in three rows of the tabs to be molded.

According to this, in order for each laser head (L1, L2, L3) to continuously engrave a plurality of (for example, 6) engraved data at a predetermined position, as shown in the operation chart shown in FIG. Within the time of one stroke (6 strokes), it is necessary to accommodate a plurality of marking (stamping 1 to marking 6) time tw and a communication time ct for switching a plurality of marking data for performing the next marking at once. ..

According to this, since one laser head is associated with each row of tabs to be molded, it is possible to correct the marking position of each row for each laser head, and when a marking error occurs. It is easier to obtain control and management benefits such as easier identification of the laser head to be modified.

As described above, according to the tab marking device and the marking method according to the embodiment of the present invention, even when the time between strokes of the tab forming press machine is shortened to improve the productivity, the coil material is used. Variable engraving on the surface can be performed smoothly. Therefore, it is possible to engrave the coil material while changing various patterns and information at any time without lowering the productivity.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the design changes, etc. within the range not deviating from the gist of the present invention, etc. Even if there is, it is included in the present invention. Further, the above-described embodiments can be combined by diverting the technologies of each other as long as there is no particular contradiction or problem in the purpose and configuration thereof.

1: Press machine, 2: Conveyor,
10: Laser engraving device, 10A: Base, 11: Feed mechanism,
12 (L1, L2, L3): Laser head,
13: Control unit, 14: Data communication unit, 15: Laser irradiation unit,
16: Speed sensor, T: Coil material, R: Roll

Claims (8)

A device that performs laser engraving on the coil material supplied to a press machine that forms a part of a can.
A feed mechanism that feeds the coil material at a set speed,
A laser head that irradiates a coil material sent at a set speed with laser light and engraves each object to be molded.
It is equipped with a data communication unit that switches the engraved data of the laser head.
The data communication unit collectively switches a plurality of marking data to be stamped on a plurality of molding objects, and the laser head continuously stamps the plurality of marking data at a predetermined position on the coil material. Laser engraving device featuring. The laser engraving device according to claim 1, wherein the plurality of engraving data include different engraving contents. Equipped with multiple laser heads
The laser engraving device according to claim 1 or 2, wherein the data communication unit switches a plurality of engraving data for each of the plurality of laser heads. In the plurality of laser heads, the marking positions shared by each laser head are sequentially divided along the feeding direction of the coil material.
For one of the laser heads, while the division of the marking position in charge of the laser head passes through the marking area of the laser head of the laser head, a plurality of marking data to be stamped in each division are stamped, and the marking data of oneself is in charge. The laser engraving device according to claim 3, wherein the engraving data is switched before the next engraving position division enters the engraving area of the laser head of the laser head. The laser engraving device according to claim 4, wherein a plurality of the laser heads are arranged along the longitudinal direction of the coil material. The laser engraving apparatus according to claim 3, wherein a plurality of the laser heads are divided into engraving positions shared by each laser head for each row to be molded on the coil material. .. The laser engraving device according to any one of claims 1 to 6, wherein the molding target is a tab of a can lid. It is a marking method that laser stamps the coil material supplied to the press machine that molds a part of the can.
A laser engraving process in which the laser head irradiates the coil material sent to the press machine at a set speed with laser light to engrave each object to be molded.
It has a data communication process for switching the engraved data of the laser head.
In the data communication step, a plurality of marking data to be stamped on a plurality of molding targets are collectively switched, and in the laser marking step, a plurality of marking data are continuously stamped at a position where the molding target is molded. A laser engraving method characterized by that.

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