JPH08224687A - Laser marking device - Google Patents

Abstract

(57) [Summary] [Purpose] To efficiently mark the outer peripheral surface of a cylindrical work while transferring it. [Structure] In the upper part of the figure, the work 9 is a plane S
It is transferred in a rolling manner without slipping on the back side of (the focal plane of laser light). In other words, while rotating around the axis at the angular velocity ω, it travels straight at a velocity of V = Rω (R: radius of the work 9). In order to transfer in this way, a jig having a known structure is actually used. Work 9 transferred in this way
Is positioned above the outer peripheral surface at each position P1, P2, P3 at a predetermined distance after a predetermined time. The scanning control unit 6 in FIG. 3 positions the optical axes of the laser beams so as to irradiate the respective positions P1, P2, P3 on the outer peripheral surface of the work 9 at predetermined points after a predetermined time. In addition, according to the marking content, the marking scanning is performed in a one-stroke manner in a strip-shaped area having a width w centering on the optical axis.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser marking apparatus for efficiently marking a part number, a part symbol, a manufacturing date, etc. on an outer peripheral surface of a cylindrical work such as a tool or a machine part while transferring the work. Regarding

[0002]

2. Description of the Related Art First, a conventional example of a general system will be described with reference to the block diagram of FIG. Laser light emitted from the laser oscillator 1 of the YAG laser is reflected by each deflection mirror.
Swung (scanned) at right angles to each other by 2u and 2v, and fθ
The surface of the flat plate-like work 10 which is the plane focus area is irradiated through the lens 3. The irradiated portion is shallowly engraved and marked by the thermal action of the laser light. Here, the fθ lens 3 is a special condensing lens that displaces light incident at a relatively large incident angle to a position from the optical axis according to the incident angle and focuses the light there. In other words, the fθ lens 3 has a feature that the focal region is wide and the marking range is large accordingly.

The deflection mirrors 2u and 2v are directly connected to the shafts of the corresponding actuators 5u and 5v, and the rotation angle of the deflection mirrors 2u and 2v is positioned by the scanning control unit 6 according to the marking content. The rotation axes of the deflection mirrors 2u and 2v are an axis that passes through the central portion and is perpendicular to the paper surface, and a central axis that is included in the mirror surface and that is parallel to the paper surface. Therefore, the laser light is oscillated in the X-axis direction and the Y-axis direction (perpendicular to the plane of the drawing) in a form of focusing on the surface of the work 10 by the rotation of the deflection mirrors 2u and 2v. At this time, the inside of a circle having a diameter W perpendicular to the optical axis of the laser beam and having the center as the center corresponds to the focal region and is the marking possible range.

Now, when the work is formed into a columnar shape such as a machine part, the marking on the outer peripheral surface will be described with reference to the schematic view of FIG. At the respective positions P1, P2, P3 on the outer peripheral surface of the work 9 as viewed from the side shown in the upper part of FIG. 2, the contents shown in the lower part are also marked. The marking contents are A, B, and C arranged one by one in the circumferential direction of the work, and the marking contents are AB.
A relatively short row of letters or numbers C, abc, 123 in the work axis direction is arranged in the work circumferential direction.

In the conventional example of marking a cylindrical work, the work 9 is sequentially indexed,
The marking point is positioned on the upper side, and laser marking is performed each time. That is, first, the position P1 on the outer peripheral surface of the work 9 is positioned on the upper side, and laser marking is performed by limiting the position P1 to a band-shaped region having a narrow width w. Because work 9
The outer peripheral surface of is farther from the position P1, the farther from the plane S (the focal area of the laser light) in contact therewith, that is, when it goes out of the band area of the width w, the irradiation image of the laser light becomes blurred and the marking becomes unclear. Is. For example, work 9
When the diameter is 10 to 50 mm, the width w is 5 mm. Incidentally, when the width w is 5 mm, the amount of deviation of the outer peripheral surface of the work 9 from the plane S is about 1 mm, and generally good marking can be obtained. Similarly, the positions P2 and P3 are sequentially positioned on the upper side in the same manner, and a region having a width w including each position is marked.

[0006]

In the conventional example, when laser-marking the outer peripheral surface of the cylindrical work 9, it is necessary to sequentially index by the index so that the marking position is positioned on the upper side. It took a lot of time and effort to prepare for marking. In general, the number of workpieces 9 such as tools and machine parts is very large, so that it takes a lot of time and labor and a lot of preparation time is required.

The problem to be solved by the present invention is to solve the above-mentioned problems of the prior art and to transfer a cylindrical work such as a tool or a machine part while transferring a part number, a part symbol and a manufacturing process on the outer peripheral surface thereof. It is to provide a laser marking device for efficiently marking the year and month.

[0008]

SUMMARY OF THE INVENTION The present invention is directed to a laser oscillator capable of irradiating an object surface placed thereon with a laser beam for scanning while scanning the laser beam in a plane focus region; A transfer jig that rolls on the back side of the area without slipping and moves straight while rotating about its axis; And a scanning control unit for causing irradiation.

The marking contents according to the present invention are as follows:
It is preferable that the symbols of the sizes included in the narrow band-shaped region are arranged in the circumferential direction of the outer peripheral surface of the work. The symbol referred to here has a wide content including characters (including numbers) and symbols (generally a mark with or without a meaning).

[0010]

According to the present invention, the scanning control unit always keeps the narrow strip-shaped region approximately included in the focal region of the laser beam on the upper portion of the outer peripheral surface of the cylindrical work which moves straight while rotating through the transfer jig. Since the laser light is irradiated, marking is sequentially performed along the circumferential direction of the outer peripheral surface of the work. Especially,
When the marks of the size included in the narrow band-shaped region are arranged and marked in the circumferential direction of the outer peripheral surface of the work, the marking can be performed by the same laser beam scanning as in the planar work.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the laser marking device according to the present invention will be described below with reference to the schematic diagram showing the operation of FIG. In the upper part of the drawing, the work 9 is transferred in a rolling manner without slipping on the back surface side of the plane S (focus area of laser light). That is, the work 9 advances straight at a speed of V = Rω (R: radius of the work 9) while rotating around the axis at the angular velocity ω. In order to transfer in this way, a jig is actually used. This transfer jig includes two motors, a work is directly connected to a shaft that rotates at a rotation angular velocity ω of the first motor, and the entire work is placed on a table. The configuration is to go straight at a speed V = Rω (via a ball screw).

Now, the work 9 transferred in this way is
Positions P1, P2, P3 on the outer peripheral surface are positioned so as to be on the upper side at respective points of a predetermined distance after a predetermined time determined by the speed V. Therefore, the scanning control unit 6 of FIG. 3 respectively irradiates the laser beams by the scanning control unit 6 of FIG. The optical axis is positioned,
In addition, a marking scan is performed in a one-stroke writing manner in a strip-shaped region having a width w centered on the optical axis according to the marking content (as in the conventional example). The positions P1, P2, P3 move away from each other in accordance with the rolling of the work 9, but are naturally in the marking possible range (the range of the diameter W in FIG. 3) corresponding to the focus area. The marking contents are slightly different from and will be described later in detail.

In the embodiment, in order to maintain good marking quality, (1) together with the condition of the strip-shaped region having the width w relating to the defocus described in the conventional example, (2) since the work 9 is constantly moving, Since the marking position is displaced and the content thereof is not distorted and deformed, it is necessary to make the scanning speed of the laser light sufficiently fast with respect to the movement and to limit the quantitative content of the marking. In other words, it is necessary to set the rotational angular velocity ω of the work 9 and thus the straight traveling velocity V to be slower than the scanning velocity of the laser light. The quantitative content of marking is designed in consideration of the size of each character and the length of the character string (the number of characters) in the marking content at each marking position in FIG. In the embodiment, the speed V is 10 to 15 mm / sec, the marking character height is 2 to 3 mm, and the number of characters is within 3. In addition, the character array in the circumferential direction, that is, each position P1, P2, P3 ...
The number of points is not particularly limited, and may be over the entire circumference of the work 9 as long as it is within the markable range W (see FIG. 3).

The marking content, the description of which has been suspended, is the letter "K" which is marked in a manner that it is widely spread over the outer peripheral surface of the work 9 unlike the. In this case, the entire outer peripheral surface is divided into fine strip-shaped areas D1, D2, ... Di ... When the area Di comes to the upper side, the portions corresponding to the elements Ei1, Ei2 of the characters belonging to the area Di are fragmented. Marking is performed and this operation is continuously performed to form one character “K”. That is, by irradiating the narrow band-like region on the upper side of the work 9 that moves straight while rotating in a fragmentary manner with the laser light in accordance with the constituent elements of the character, the entire marking can be performed as a result.

[0015]

According to the present invention, the following excellent effects can be expected. (1) Since the laser beam is always radiated to the narrow strip-shaped region approximately included in the focus region of the laser beam on the upper surface of the outer peripheral surface of the circular column-shaped workpiece that moves straight while rotating through the transfer jig, The marking is sequentially performed along the circumferential direction of the outer peripheral surface. Therefore, it is possible to mark on the outer peripheral surface of the cylindrical work while the work is being transferred while rotating and moving straight, that is, without stopping the work. It saves time and is efficient. In addition, the symbols (characters and symbols) that can be marked on the outer peripheral surface of the work are not particularly limited in size and are general and convenient. (2) Especially when the work is a tool or machine part, the markings are arranged in the circumferential direction on the outer peripheral surface of the work, and the markings are of a size included in a narrow band-shaped area, such as a part number, a part code, or a manufacturing date. Since there are many cases, there is a restriction that the straight traveling speed of the transfer is slightly slowed down, but even for a cylindrical work, it is performed by the same laser light scanning as in a flat work, which is very convenient in design and operation. is there.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an operation of an embodiment according to the present invention.

FIG. 2 is a schematic diagram showing the operation of a conventional example.

FIG. 3 is a block diagram showing a configuration of a conventional general apparatus.

[Explanation of symbols]

 1 Laser Oscillator 2u, 2v Deflection Mirror 3 fθ Lens 5u, 5v Actuator 6 Control Section (For Scanning) 9, 10 Work

Claims (2)

[Claims] 1. A laser oscillator capable of marking by irradiating an object surface placed thereon while scanning a laser beam in a planar focal region; a cylindrical work without slipping on the back surface side of the focal region. A transfer jig that rolls and moves straight while rotating around its axis; and a scanning control unit that constantly irradiates a laser beam to a narrow strip-shaped area on the outer peripheral surface of the work, including a contact line with the focal area. A laser marking device comprising: 2. The laser marking according to claim 1, wherein the marking is a mark in which the size symbols included in the narrow band-shaped region are arranged in the circumferential direction of the outer peripheral surface of the work. apparatus.