CN102442082A - Device and method for marking on aluminium alloy anode layer surface by utilizing laser - Google Patents

Abstract

The invention provides a device and a method for marking on an aluminium alloy anode layer surface by utilizing laser. The device comprises: a laser, which is used for providing a light source for a surface of a laser processing material; an adjustable beam expander, which is used for expanding lights emitted by a laser source so as to improve a laser transmission characteristic to enable laser to be well converged on the surface of the material; a vibration lens, which is used for utilizing a motor to drive laser with a lens deflection type to carry out localization according to an assigned position given by a computer; an optical lens, which is used for enabling laser light spot characteristics of laser light beams focused on a point on a certain plane to be consistent; and an optical path protective cover, which is used for sealing an optical path. According to the method, the device is started; according to the thickness of a processed aluminium alloy anode layer, a pulse wave length and a pulse width of a laser are adjusted; and marking is carried out on the surface of the aluminium alloy anode layer. According to the invention, when marking is carried out, a compact protective film can be formed on an anode layer without damage on the surface of the anode layer; and the attribute strength of the anode layer is also not changed.

Description

Utilize the Apparatus and method for of laser in the mark of aluminum alloy anode laminar surface

Technical field

The present invention relates to laser processing technology, relate in particular to a kind of Apparatus and method for that utilizes laser in the mark of aluminum alloy anode laminar surface.

Background technology

Existing technology in the aluminum alloy surface mark generally includes following steps: in anode layer surface mark, after the white to be shown, again the aluminum alloy anode after the mark is carried out anode treatment with laser; Blow in mark limit, limit, to form the oxide film protection layer at this anode; Increase particular matter, change after the laser radiation, form effect with distinct contrast.But; There is certain defective in above-mentioned processing method, is mainly reflected in: the one, and anode layer is removed fully in the laser action district, causes this regional aluminium alloy matter metal level well not protected; Therefore should be corroded easily in the zone, its intensity is difficult to guarantee; The 2nd, add auxiliary material or carry out after-treatment, more time-consuming, be unfavorable for commercial production.

Summary of the invention

In view of this; Main purpose of the present invention is to provide a kind of Apparatus and method for that utilizes laser in the mark of aluminum alloy anode laminar surface; So that in mark, can form compact protective film in anode layer mark zone; And do not need the attribute intensity of deface anode layer and anode layer, can form smooth, color contrast is distinct, do not have the mark mark of sense of touch.

For achieving the above object, technical scheme of the present invention is achieved in that

A kind of equipment that utilizes laser in the mark of aluminum alloy anode laminar surface comprises red led, and the light path protective cover also comprises laser instrument, adjustable beam expanding lens, galvanometer head and optical lens; Wherein:

Laser instrument is used to the laser processing of materials surface light source is provided;

Adjustable beam expanding lens, the light that is used for lasing light emitter is sent enlarges, and the transmission characteristic that improves laser is so that it converges to material surface with laser better;

Red led is used for the location indication;

The galvanometer head is combined by motor and optics, is used to utilize the laser of driven by motor eyeglass gauche form to position according to the given assigned address of computer;

Optical lens is used to make laser beam consistent to the laser facula characteristic of point at a certain flat focus;

The light path protective cover is used to seal light path.

Wherein, described laser instrument is a pulse laser, and its pulse wavelength is 1000nm～1100nm.

The pulsewidth of described laser instrument is 2ns～20ns.

A kind of method of utilizing laser in the mark of aluminum alloy anode laminar surface comprises:

A, be enabled in the equipment of aluminum alloy anode laminar surface mark;

B, according to the anode layer thickness of processed aluminium alloy, the pulse wavelength and the pulse width of adjustment laser instrument;

C, when laser beam sees through adjustable parallel beam expand device, pulse laser after treatment focuses on the anode layer surface of said aluminium alloy again through optical lens, the laser beam that utilizes said laser instrument to send carries out mark to the anode layer surface of aluminium alloy.

The Apparatus and method for that utilizes laser in the mark of aluminum alloy anode top layer provided by the present invention; Have the following advantages: compare with existing processes; Therefore its marker color of getting is an ink black, can make mark zone and non-mark zone form sharp contrast, and can the zone after mark destroy the anode layer of aluminum alloy surface; Both guaranteed the intensity in mark zone, and can effectively avoid being corroded again.Aluminum alloy surface after the mark, outward appearance is beautiful, is fit to commercial production.

Description of drawings

Fig. 1 is aluminium alloy plate (like the notebook computer casing) sketch map after the mark;

Figure 1A is the amplification effect comparison diagram of aluminium alloy plate before and after laser marking processing;

Fig. 2 is the cross-sectional view of aluminium alloy plate of the present invention behind laser marking;

Fig. 2 A is the thickness measurement data sketch map of material shown in Figure 2 behind laser marking;

Fig. 3 is the structural representation of laser marking device of the present invention.

[critical piece symbol description]

1: aluminium alloy plate (like notebook computer casing)

2: non-mark zone

3: mark zone (being the Laser Processing zone)

4: the anode layer surface

5: anode layer

6: the barrier layer

7: base material

8: laser instrument

9: adjustable beam expanding lens

10: red led

11: the galvanometer head

12: optical lens

13: the light path protective cover.

The specific embodiment

Below in conjunction with accompanying drawing and embodiments of the invention method of the present invention is done further detailed explanation.

Basic principle of the present invention: adopt a kind of laser instrument, adjustable beam-expanding system, detection system and the integrated equipment that aims at the mark of aluminum alloy surface anode layer of software control by nanosecond; The laser beam that utilizes this laser instrument to send carries out mark to the anode layer surface of metal especially aluminum alloy materials; When laser beam sees through adjustable parallel beam expand device; Pulsed light after treatment focuses on through optical lens again; Utilize software control, suitable speed, frequency are set, the anode layer surface at aluminium alloy forms smooth black effect under the effect of laser at last.

Fig. 1 is aluminium alloy plate (like the notebook computer casing) sketch map after the mark, and as shown in Figure 1, on the surface of aluminium alloy plate 1, the zone after the mark is very obvious, and the non-mark of shell zone 2 is keeping the former state of aluminium alloy, mark zone 3 color black in color.Using colour difference meter to detect the L value is 29～31, and a value is 0.6～0.96, and the b value is 1.5～2.3.Compare other its brightness of anode film zone is lower, and high-definition contrast is arranged.

Here, adopt L*a*b* colour space look main body representation, wherein: L represents brightness, and a* and b* are chromaticity coordinates.A* and b* represent that look direction :+a* is a red direction, and-a* is green direction, and+b* is yellow direction, and-b* is blue direction.

Figure 1A is the amplification effect comparison diagram of aluminium alloy plate before and after laser marking processing, and is as shown in the figure, and at the microscopically that amplifies 500 times, the zone before the processing of left side is more coarse, and the zone after the processing of right side is then relatively level and smooth.As can be seen from the figure, do not destroy the original shading of anode layer after the mark, measure with film thickness gauge, the anode layer in mark zone is the same with there not being mark zone anode layer thickness.Further illustrate this laser marking technology and do not destroy the anode layer surface.

Fig. 2 is the cross-sectional view of aluminium alloy plate of the present invention behind laser marking; As shown in Figure 2; Anode layer surface 4 on the aluminium alloy plate, mark zone 3 are that the degree of depth in Laser Processing zone is compared about the non-mark dark approximately 1um in zone, and the thickness of anode layer 5 is about 5um～20um.Can find out that barrier layer 6 owing to be heated and produced small hole, crystalline phase variation (can with reference to Figure 1A) has taken place under the effect of Laser Processing.Base material 7 is the aluminum of the various series of aluminium 3-6.

Fig. 2 A is the thickness measurement data sketch map of material shown in Figure 2 behind laser marking; As shown in the figure, base material is the aluminum of aluminium 3～6 various series, after laser marking processing; On the surface of material surface anode, form the aluminium oxide thin layer; Its thickness is 5～20um, and horniness anode oxide film thickness can reach 60～200um, and laser acts on just that this aspect has changed surperficial color characteristics and the effect that do not influence the characteristic of film.

Fig. 3 is the structural representation of laser marking device of the present invention; Laser marking device as shown in Figure 3 mainly comprises laser instrument 8, adjustable beam expanding lens 9, red led 10, galvanometer head 11, optical lens 12, light path protective cover 13 totally 6 parts.Wherein:

Laser instrument 8 adopts infrared laser light source, mean power 20W, and peak power is 1.6kW, frequency of utilization is the laser generator of 500kHz, for the laser processing of materials surface provides light source.To go out smooth and black effect in the anode layer mark of aluminum alloy surface; Selection to laser instrument is important: 1) wavelength is selected: its wavelength must have reasonable absorption to this material; Adopt pulse laser, between laser wavelength 1000nm～1100nm.For example 1064nm is just proper.2) selection of pulsewidth: the pulsewidth of this laser instrument can be regulated between 2ns～20ns.Relatively thin for anode layer, for example surperficial anode layer thickness is at 4um～7um, and pulsewidth is proper in the 20ns left and right sides; If surperficial anode layer thickness is at 10um～15um, it is proper that then pulsewidth is selected the 2ns left and right sides.

Adjustable beam expanding lens 9, the light that is used for LASER Light Source is sent enlarges, and the transmission characteristic that improves laser is so that it converges to material surface with laser better.

Red led 10 is a kind of low power emitting lasers, is consistent through the path of the oblique anti-mirror 10 of ruddiness with ruddiness and laser, is used for the location indication.

Galvanometer head 11, these parts are to be combined by motor and optics, are used to utilize the laser of driven by motor eyeglass gauche form to position according to the given assigned address of computer.

Optical lens 12 is used to make laser beam consistent to the laser facula characteristic of point at a certain flat focus.

Light path protective cover 13 is used to seal light path, avoids light path lens to pollute.

In its course of work; Through the various parameters of computer control laser, and, utilize lens that laser is converged to the surface with laser galvanometer scanning to the adjusting that difference expands the bundle multiple; Form the change color of anode aluminium valency, and guarantee not destroy a kind of working method of anode layer.

Under normal conditions, anode layer is easy to destroy.And changed the performance of material, make can solve in this way that material property does not change and characteristic that color changes.This process can substitute the mode of traditional spraying.

The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.。

Claims (4)

1. an equipment that utilizes laser in the mark of aluminum alloy anode laminar surface comprises red led, and the light path protective cover is characterized in that, this equipment also comprises laser instrument, adjustable beam expanding lens, galvanometer head and optical lens; Wherein:

Laser instrument is used to the laser processing of materials surface light source is provided;

Adjustable beam expanding lens, the light that is used for lasing light emitter is sent enlarges, and the transmission characteristic that improves laser is so that it converges to material surface with laser better;

Red led is used for the location indication;

The galvanometer head is combined by motor and optics, is used to utilize the laser of driven by motor eyeglass gauche form to position according to the given assigned address of computer;

Optical lens is used to make laser beam consistent to the laser facula characteristic of point at a certain flat focus;

The light path protective cover is used to seal light path.

2. the equipment that utilizes laser in the mark of aluminum alloy anode laminar surface according to claim 1 is characterized in that described laser instrument is a pulse laser, and its pulse wavelength is 1000nm～1100nm.

3. the equipment that utilizes laser in the mark of aluminum alloy anode laminar surface according to claim 1 and 2 is characterized in that the pulsewidth of described laser instrument is 2ns～20ns.

4. a method of utilizing laser in the mark of aluminum alloy anode laminar surface is characterized in that, comprising:

A, be enabled in the equipment of aluminum alloy anode laminar surface mark;

B, according to the anode layer thickness of processed aluminium alloy, the pulse wavelength and the pulse width of adjustment laser instrument;

C, when laser beam sees through adjustable parallel beam expand device, pulse laser after treatment focuses on the anode layer surface of said aluminium alloy again through optical lens, the laser beam that utilizes said laser instrument to send carries out mark to the anode layer surface of aluminium alloy.

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